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| author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
|---|---|---|
| committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-19 00:47:55 +0000 |
| commit | 26a029d407be480d791972afb5975cf62c9360a6 (patch) | |
| tree | f435a8308119effd964b339f76abb83a57c29483 /modules/brotli | |
| parent | Initial commit. (diff) | |
| download | firefox-upstream/124.0.1.tar.xz firefox-upstream/124.0.1.zip | |
Adding upstream version 124.0.1.upstream/124.0.1
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'modules/brotli')
29 files changed, 14711 insertions, 0 deletions
diff --git a/modules/brotli/LICENSE b/modules/brotli/LICENSE new file mode 100644 index 0000000000..33b7cdd2db --- /dev/null +++ b/modules/brotli/LICENSE @@ -0,0 +1,19 @@ +Copyright (c) 2009, 2010, 2013-2016 by the Brotli Authors. + +Permission is hereby granted, free of charge, to any person obtaining a copy +of this software and associated documentation files (the "Software"), to deal +in the Software without restriction, including without limitation the rights +to use, copy, modify, merge, publish, distribute, sublicense, and/or sell +copies of the Software, and to permit persons to whom the Software is +furnished to do so, subject to the following conditions: + +The above copyright notice and this permission notice shall be included in +all copies or substantial portions of the Software. + +THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR +IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, +FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE +AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER +LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, +OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN +THE SOFTWARE. diff --git a/modules/brotli/common/constants.c b/modules/brotli/common/constants.c new file mode 100644 index 0000000000..89866b1505 --- /dev/null +++ b/modules/brotli/common/constants.c @@ -0,0 +1,15 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +#include "constants.h" + +const BrotliPrefixCodeRange + _kBrotliPrefixCodeRanges[BROTLI_NUM_BLOCK_LEN_SYMBOLS] = { + {1, 2}, {5, 2}, {9, 2}, {13, 2}, {17, 3}, {25, 3}, + {33, 3}, {41, 3}, {49, 4}, {65, 4}, {81, 4}, {97, 4}, + {113, 5}, {145, 5}, {177, 5}, {209, 5}, {241, 6}, {305, 6}, + {369, 7}, {497, 8}, {753, 9}, {1265, 10}, {2289, 11}, {4337, 12}, + {8433, 13}, {16625, 24}}; diff --git a/modules/brotli/common/constants.h b/modules/brotli/common/constants.h new file mode 100644 index 0000000000..31e5bd376e --- /dev/null +++ b/modules/brotli/common/constants.h @@ -0,0 +1,201 @@ +/* Copyright 2016 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/** + * @file + * Common constants used in decoder and encoder API. + */ + +#ifndef BROTLI_COMMON_CONSTANTS_H_ +#define BROTLI_COMMON_CONSTANTS_H_ + +#include <brotli/port.h> +#include <brotli/types.h> + +#include "platform.h" + +/* Specification: 7.3. Encoding of the context map */ +#define BROTLI_CONTEXT_MAP_MAX_RLE 16 + +/* Specification: 2. Compressed representation overview */ +#define BROTLI_MAX_NUMBER_OF_BLOCK_TYPES 256 + +/* Specification: 3.3. Alphabet sizes: insert-and-copy length */ +#define BROTLI_NUM_LITERAL_SYMBOLS 256 +#define BROTLI_NUM_COMMAND_SYMBOLS 704 +#define BROTLI_NUM_BLOCK_LEN_SYMBOLS 26 +#define BROTLI_MAX_CONTEXT_MAP_SYMBOLS (BROTLI_MAX_NUMBER_OF_BLOCK_TYPES + \ + BROTLI_CONTEXT_MAP_MAX_RLE) +#define BROTLI_MAX_BLOCK_TYPE_SYMBOLS (BROTLI_MAX_NUMBER_OF_BLOCK_TYPES + 2) + +/* Specification: 3.5. Complex prefix codes */ +#define BROTLI_REPEAT_PREVIOUS_CODE_LENGTH 16 +#define BROTLI_REPEAT_ZERO_CODE_LENGTH 17 +#define BROTLI_CODE_LENGTH_CODES (BROTLI_REPEAT_ZERO_CODE_LENGTH + 1) +/* "code length of 8 is repeated" */ +#define BROTLI_INITIAL_REPEATED_CODE_LENGTH 8 + +/* "Large Window Brotli" */ + +/** + * The theoretical maximum number of distance bits specified for large window + * brotli, for 64-bit encoders and decoders. Even when in practice 32-bit + * encoders and decoders only support up to 30 max distance bits, the value is + * set to 62 because it affects the large window brotli file format. + * Specifically, it affects the encoding of simple huffman tree for distances, + * see Specification RFC 7932 chapter 3.4. + */ +#define BROTLI_LARGE_MAX_DISTANCE_BITS 62U +#define BROTLI_LARGE_MIN_WBITS 10 +/** + * The maximum supported large brotli window bits by the encoder and decoder. + * Large window brotli allows up to 62 bits, however the current encoder and + * decoder, designed for 32-bit integers, only support up to 30 bits maximum. + */ +#define BROTLI_LARGE_MAX_WBITS 30 + +/* Specification: 4. Encoding of distances */ +#define BROTLI_NUM_DISTANCE_SHORT_CODES 16 +/** + * Maximal number of "postfix" bits. + * + * Number of "postfix" bits is stored as 2 bits in meta-block header. + */ +#define BROTLI_MAX_NPOSTFIX 3 +#define BROTLI_MAX_NDIRECT 120 +#define BROTLI_MAX_DISTANCE_BITS 24U +#define BROTLI_DISTANCE_ALPHABET_SIZE(NPOSTFIX, NDIRECT, MAXNBITS) ( \ + BROTLI_NUM_DISTANCE_SHORT_CODES + (NDIRECT) + \ + ((MAXNBITS) << ((NPOSTFIX) + 1))) +/* BROTLI_NUM_DISTANCE_SYMBOLS == 1128 */ +#define BROTLI_NUM_DISTANCE_SYMBOLS \ + BROTLI_DISTANCE_ALPHABET_SIZE( \ + BROTLI_MAX_NDIRECT, BROTLI_MAX_NPOSTFIX, BROTLI_LARGE_MAX_DISTANCE_BITS) + +/* ((1 << 26) - 4) is the maximal distance that can be expressed in RFC 7932 + brotli stream using NPOSTFIX = 0 and NDIRECT = 0. With other NPOSTFIX and + NDIRECT values distances up to ((1 << 29) + 88) could be expressed. */ +#define BROTLI_MAX_DISTANCE 0x3FFFFFC + +/* ((1 << 31) - 4) is the safe distance limit. Using this number as a limit + allows safe distance calculation without overflows, given the distance + alphabet size is limited to corresponding size + (see kLargeWindowDistanceCodeLimits). */ +#define BROTLI_MAX_ALLOWED_DISTANCE 0x7FFFFFFC + + +/* Specification: 4. Encoding of Literal Insertion Lengths and Copy Lengths */ +#define BROTLI_NUM_INS_COPY_CODES 24 + +/* 7.1. Context modes and context ID lookup for literals */ +/* "context IDs for literals are in the range of 0..63" */ +#define BROTLI_LITERAL_CONTEXT_BITS 6 + +/* 7.2. Context ID for distances */ +#define BROTLI_DISTANCE_CONTEXT_BITS 2 + +/* 9.1. Format of the Stream Header */ +/* Number of slack bytes for window size. Don't confuse + with BROTLI_NUM_DISTANCE_SHORT_CODES. */ +#define BROTLI_WINDOW_GAP 16 +#define BROTLI_MAX_BACKWARD_LIMIT(W) (((size_t)1 << (W)) - BROTLI_WINDOW_GAP) + +typedef struct BrotliDistanceCodeLimit { + uint32_t max_alphabet_size; + uint32_t max_distance; +} BrotliDistanceCodeLimit; + +/* This function calculates maximal size of distance alphabet, such that the + distances greater than the given values can not be represented. + + This limits are designed to support fast and safe 32-bit decoders. + "32-bit" means that signed integer values up to ((1 << 31) - 1) could be + safely expressed. + + Brotli distance alphabet symbols do not represent consecutive distance + ranges. Each distance alphabet symbol (excluding direct distances and short + codes), represent interleaved (for NPOSTFIX > 0) range of distances. + A "group" of consecutive (1 << NPOSTFIX) symbols represent non-interleaved + range. Two consecutive groups require the same amount of "extra bits". + + It is important that distance alphabet represents complete "groups". + To avoid complex logic on encoder side about interleaved ranges + it was decided to restrict both sides to complete distance code "groups". + */ +BROTLI_UNUSED_FUNCTION BrotliDistanceCodeLimit BrotliCalculateDistanceCodeLimit( + uint32_t max_distance, uint32_t npostfix, uint32_t ndirect) { + BrotliDistanceCodeLimit result; + /* Marking this function as unused, because not all files + including "constants.h" use it -> compiler warns about that. */ + BROTLI_UNUSED(&BrotliCalculateDistanceCodeLimit); + if (max_distance <= ndirect) { + /* This case never happens / exists only for the sake of completeness. */ + result.max_alphabet_size = max_distance + BROTLI_NUM_DISTANCE_SHORT_CODES; + result.max_distance = max_distance; + return result; + } else { + /* The first prohibited value. */ + uint32_t forbidden_distance = max_distance + 1; + /* Subtract "directly" encoded region. */ + uint32_t offset = forbidden_distance - ndirect - 1; + uint32_t ndistbits = 0; + uint32_t tmp; + uint32_t half; + uint32_t group; + /* Postfix for the last dcode in the group. */ + uint32_t postfix = (1u << npostfix) - 1; + uint32_t extra; + uint32_t start; + /* Remove postfix and "head-start". */ + offset = (offset >> npostfix) + 4; + /* Calculate the number of distance bits. */ + tmp = offset / 2; + /* Poor-man's log2floor, to avoid extra dependencies. */ + while (tmp != 0) {ndistbits++; tmp = tmp >> 1;} + /* One bit is covered with subrange addressing ("half"). */ + ndistbits--; + /* Find subrange. */ + half = (offset >> ndistbits) & 1; + /* Calculate the "group" part of dcode. */ + group = ((ndistbits - 1) << 1) | half; + /* Calculated "group" covers the prohibited distance value. */ + if (group == 0) { + /* This case is added for correctness; does not occur for limit > 128. */ + result.max_alphabet_size = ndirect + BROTLI_NUM_DISTANCE_SHORT_CODES; + result.max_distance = ndirect; + return result; + } + /* Decrement "group", so it is the last permitted "group". */ + group--; + /* After group was decremented, ndistbits and half must be recalculated. */ + ndistbits = (group >> 1) + 1; + /* The last available distance in the subrange has all extra bits set. */ + extra = (1u << ndistbits) - 1; + /* Calculate region start. NB: ndistbits >= 1. */ + start = (1u << (ndistbits + 1)) - 4; + /* Move to subregion. */ + start += (group & 1) << ndistbits; + /* Calculate the alphabet size. */ + result.max_alphabet_size = ((group << npostfix) | postfix) + ndirect + + BROTLI_NUM_DISTANCE_SHORT_CODES + 1; + /* Calculate the maximal distance representable by alphabet. */ + result.max_distance = ((start + extra) << npostfix) + postfix + ndirect + 1; + return result; + } +} + +/* Represents the range of values belonging to a prefix code: + [offset, offset + 2^nbits) */ +typedef struct { + uint16_t offset; + uint8_t nbits; +} BrotliPrefixCodeRange; + +/* "Soft-private", it is exported, but not "advertised" as API. */ +BROTLI_COMMON_API extern const BrotliPrefixCodeRange + _kBrotliPrefixCodeRanges[BROTLI_NUM_BLOCK_LEN_SYMBOLS]; + +#endif /* BROTLI_COMMON_CONSTANTS_H_ */ diff --git a/modules/brotli/common/context.c b/modules/brotli/common/context.c new file mode 100644 index 0000000000..7f9c958699 --- /dev/null +++ b/modules/brotli/common/context.c @@ -0,0 +1,156 @@ +#include "context.h" + +#include <brotli/types.h> + +/* Common context lookup table for all context modes. */ +const uint8_t _kBrotliContextLookupTable[2048] = { + /* CONTEXT_LSB6, last byte. */ + 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, + 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, + 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, + 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, + 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, + 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, + 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, + 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, + 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, + 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, + 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, + 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, + 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, + 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, + 32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, + 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, + + /* CONTEXT_LSB6, second last byte, */ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + + /* CONTEXT_MSB6, last byte. */ + 0, 0, 0, 0, 1, 1, 1, 1, 2, 2, 2, 2, 3, 3, 3, 3, + 4, 4, 4, 4, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 7, 7, + 8, 8, 8, 8, 9, 9, 9, 9, 10, 10, 10, 10, 11, 11, 11, 11, + 12, 12, 12, 12, 13, 13, 13, 13, 14, 14, 14, 14, 15, 15, 15, 15, + 16, 16, 16, 16, 17, 17, 17, 17, 18, 18, 18, 18, 19, 19, 19, 19, + 20, 20, 20, 20, 21, 21, 21, 21, 22, 22, 22, 22, 23, 23, 23, 23, + 24, 24, 24, 24, 25, 25, 25, 25, 26, 26, 26, 26, 27, 27, 27, 27, + 28, 28, 28, 28, 29, 29, 29, 29, 30, 30, 30, 30, 31, 31, 31, 31, + 32, 32, 32, 32, 33, 33, 33, 33, 34, 34, 34, 34, 35, 35, 35, 35, + 36, 36, 36, 36, 37, 37, 37, 37, 38, 38, 38, 38, 39, 39, 39, 39, + 40, 40, 40, 40, 41, 41, 41, 41, 42, 42, 42, 42, 43, 43, 43, 43, + 44, 44, 44, 44, 45, 45, 45, 45, 46, 46, 46, 46, 47, 47, 47, 47, + 48, 48, 48, 48, 49, 49, 49, 49, 50, 50, 50, 50, 51, 51, 51, 51, + 52, 52, 52, 52, 53, 53, 53, 53, 54, 54, 54, 54, 55, 55, 55, 55, + 56, 56, 56, 56, 57, 57, 57, 57, 58, 58, 58, 58, 59, 59, 59, 59, + 60, 60, 60, 60, 61, 61, 61, 61, 62, 62, 62, 62, 63, 63, 63, 63, + + /* CONTEXT_MSB6, second last byte, */ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + + /* CONTEXT_UTF8, last byte. */ + /* ASCII range. */ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 4, 4, 0, 0, 4, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 8, 12, 16, 12, 12, 20, 12, 16, 24, 28, 12, 12, 32, 12, 36, 12, + 44, 44, 44, 44, 44, 44, 44, 44, 44, 44, 32, 32, 24, 40, 28, 12, + 12, 48, 52, 52, 52, 48, 52, 52, 52, 48, 52, 52, 52, 52, 52, 48, + 52, 52, 52, 52, 52, 48, 52, 52, 52, 52, 52, 24, 12, 28, 12, 12, + 12, 56, 60, 60, 60, 56, 60, 60, 60, 56, 60, 60, 60, 60, 60, 56, + 60, 60, 60, 60, 60, 56, 60, 60, 60, 60, 60, 24, 12, 28, 12, 0, + /* UTF8 continuation byte range. */ + 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, + 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, + 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, + 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, 0, 1, + /* UTF8 lead byte range. */ + 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, + 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, + 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, + 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, 2, 3, + + /* CONTEXT_UTF8 second last byte. */ + /* ASCII range. */ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, 1, + 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, + 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 1, 1, 1, 1, 1, + 1, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, + 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 1, 1, 1, 1, 0, + /* UTF8 continuation byte range. */ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + /* UTF8 lead byte range. */ + 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, + 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, + 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, + + /* CONTEXT_SIGNED, last byte, same as the above values shifted by 3 bits. */ + 0, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, + 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, + 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, + 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, 16, + 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, + 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, 24, + 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, + 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, + 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, + 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, 32, + 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, + 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, + 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, 40, + 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 48, 56, + + /* CONTEXT_SIGNED, second last byte. */ + 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, + 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, + 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, + 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, + 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, + 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, + 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, + 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, 3, + 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, + 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, + 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, + 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, 4, + 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, + 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, + 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, + 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, +}; diff --git a/modules/brotli/common/context.h b/modules/brotli/common/context.h new file mode 100644 index 0000000000..685a279dc0 --- /dev/null +++ b/modules/brotli/common/context.h @@ -0,0 +1,113 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Lookup table to map the previous two bytes to a context id. + + There are four different context modeling modes defined here: + CONTEXT_LSB6: context id is the least significant 6 bits of the last byte, + CONTEXT_MSB6: context id is the most significant 6 bits of the last byte, + CONTEXT_UTF8: second-order context model tuned for UTF8-encoded text, + CONTEXT_SIGNED: second-order context model tuned for signed integers. + + If |p1| and |p2| are the previous two bytes, and |mode| is current context + mode, we calculate the context as: + + context = ContextLut(mode)[p1] | ContextLut(mode)[p2 + 256]. + + For CONTEXT_UTF8 mode, if the previous two bytes are ASCII characters + (i.e. < 128), this will be equivalent to + + context = 4 * context1(p1) + context2(p2), + + where context1 is based on the previous byte in the following way: + + 0 : non-ASCII control + 1 : \t, \n, \r + 2 : space + 3 : other punctuation + 4 : " ' + 5 : % + 6 : ( < [ { + 7 : ) > ] } + 8 : , ; : + 9 : . + 10 : = + 11 : number + 12 : upper-case vowel + 13 : upper-case consonant + 14 : lower-case vowel + 15 : lower-case consonant + + and context2 is based on the second last byte: + + 0 : control, space + 1 : punctuation + 2 : upper-case letter, number + 3 : lower-case letter + + If the last byte is ASCII, and the second last byte is not (in a valid UTF8 + stream it will be a continuation byte, value between 128 and 191), the + context is the same as if the second last byte was an ASCII control or space. + + If the last byte is a UTF8 lead byte (value >= 192), then the next byte will + be a continuation byte and the context id is 2 or 3 depending on the LSB of + the last byte and to a lesser extent on the second last byte if it is ASCII. + + If the last byte is a UTF8 continuation byte, the second last byte can be: + - continuation byte: the next byte is probably ASCII or lead byte (assuming + 4-byte UTF8 characters are rare) and the context id is 0 or 1. + - lead byte (192 - 207): next byte is ASCII or lead byte, context is 0 or 1 + - lead byte (208 - 255): next byte is continuation byte, context is 2 or 3 + + The possible value combinations of the previous two bytes, the range of + context ids and the type of the next byte is summarized in the table below: + + |--------\-----------------------------------------------------------------| + | \ Last byte | + | Second \---------------------------------------------------------------| + | last byte \ ASCII | cont. byte | lead byte | + | \ (0-127) | (128-191) | (192-) | + |=============|===================|=====================|==================| + | ASCII | next: ASCII/lead | not valid | next: cont. | + | (0-127) | context: 4 - 63 | | context: 2 - 3 | + |-------------|-------------------|---------------------|------------------| + | cont. byte | next: ASCII/lead | next: ASCII/lead | next: cont. | + | (128-191) | context: 4 - 63 | context: 0 - 1 | context: 2 - 3 | + |-------------|-------------------|---------------------|------------------| + | lead byte | not valid | next: ASCII/lead | not valid | + | (192-207) | | context: 0 - 1 | | + |-------------|-------------------|---------------------|------------------| + | lead byte | not valid | next: cont. | not valid | + | (208-) | | context: 2 - 3 | | + |-------------|-------------------|---------------------|------------------| +*/ + +#ifndef BROTLI_COMMON_CONTEXT_H_ +#define BROTLI_COMMON_CONTEXT_H_ + +#include <brotli/port.h> +#include <brotli/types.h> + +typedef enum ContextType { + CONTEXT_LSB6 = 0, + CONTEXT_MSB6 = 1, + CONTEXT_UTF8 = 2, + CONTEXT_SIGNED = 3 +} ContextType; + +/* "Soft-private", it is exported, but not "advertised" as API. */ +/* Common context lookup table for all context modes. */ +BROTLI_COMMON_API extern const uint8_t _kBrotliContextLookupTable[2048]; + +typedef const uint8_t* ContextLut; + +/* typeof(MODE) == ContextType; returns ContextLut */ +#define BROTLI_CONTEXT_LUT(MODE) (&_kBrotliContextLookupTable[(MODE) << 9]) + +/* typeof(LUT) == ContextLut */ +#define BROTLI_CONTEXT(P1, P2, LUT) ((LUT)[P1] | ((LUT) + 256)[P2]) + +#endif /* BROTLI_COMMON_CONTEXT_H_ */ diff --git a/modules/brotli/common/dictionary.c b/modules/brotli/common/dictionary.c new file mode 100644 index 0000000000..7c015ab0ba --- /dev/null +++ b/modules/brotli/common/dictionary.c @@ -0,0 +1,5916 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +#include "dictionary.h" +#include "platform.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +#if !defined(BROTLI_EXTERNAL_DICTIONARY_DATA) +static const uint8_t kBrotliDictionaryData[] = +/* GENERATED CODE START */ +{ +116,105,109,101,100,111,119,110,108,105,102,101,108,101,102,116,98,97,99,107,99, +111,100,101,100,97,116,97,115,104,111,119,111,110,108,121,115,105,116,101,99,105 +,116,121,111,112,101,110,106,117,115,116,108,105,107,101,102,114,101,101,119,111 +,114,107,116,101,120,116,121,101,97,114,111,118,101,114,98,111,100,121,108,111, +118,101,102,111,114,109,98,111,111,107,112,108,97,121,108,105,118,101,108,105, +110,101,104,101,108,112,104,111,109,101,115,105,100,101,109,111,114,101,119,111, +114,100,108,111,110,103,116,104,101,109,118,105,101,119,102,105,110,100,112,97, +103,101,100,97,121,115,102,117,108,108,104,101,97,100,116,101,114,109,101,97,99, +104,97,114,101,97,102,114,111,109,116,114,117,101,109,97,114,107,97,98,108,101, +117,112,111,110,104,105,103,104,100,97,116,101,108,97,110,100,110,101,119,115, +101,118,101,110,110,101,120,116,99,97,115,101,98,111,116,104,112,111,115,116,117 +,115,101,100,109,97,100,101,104,97,110,100,104,101,114,101,119,104,97,116,110,97 +,109,101,76,105,110,107,98,108,111,103,115,105,122,101,98,97,115,101,104,101,108 +,100,109,97,107,101,109,97,105,110,117,115,101,114,39,41,32,43,104,111,108,100, +101,110,100,115,119,105,116,104,78,101,119,115,114,101,97,100,119,101,114,101, +115,105,103,110,116,97,107,101,104,97,118,101,103,97,109,101,115,101,101,110,99, +97,108,108,112,97,116,104,119,101,108,108,112,108,117,115,109,101,110,117,102, +105,108,109,112,97,114,116,106,111,105,110,116,104,105,115,108,105,115,116,103, +111,111,100,110,101,101,100,119,97,121,115,119,101,115,116,106,111,98,115,109, +105,110,100,97,108,115,111,108,111,103,111,114,105,99,104,117,115,101,115,108,97 +,115,116,116,101,97,109,97,114,109,121,102,111,111,100,107,105,110,103,119,105, +108,108,101,97,115,116,119,97,114,100,98,101,115,116,102,105,114,101,80,97,103, +101,107,110,111,119,97,119,97,121,46,112,110,103,109,111,118,101,116,104,97,110, +108,111,97,100,103,105,118,101,115,101,108,102,110,111,116,101,109,117,99,104, +102,101,101,100,109,97,110,121,114,111,99,107,105,99,111,110,111,110,99,101,108, +111,111,107,104,105,100,101,100,105,101,100,72,111,109,101,114,117,108,101,104, +111,115,116,97,106,97,120,105,110,102,111,99,108,117,98,108,97,119,115,108,101, +115,115,104,97,108,102,115,111,109,101,115,117,99,104,122,111,110,101,49,48,48, +37,111,110,101,115,99,97,114,101,84,105,109,101,114,97,99,101,98,108,117,101,102 +,111,117,114,119,101,101,107,102,97,99,101,104,111,112,101,103,97,118,101,104,97 +,114,100,108,111,115,116,119,104,101,110,112,97,114,107,107,101,112,116,112,97, 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+39,116,101,120,116,47,106,97,118,97,115,99,114,105,112,116,39,62,208,180,208,181 +,209,143,209,130,208,181,208,187,209,140,208,189,208,190,209,129,209,130,208,184 +,209,129,208,190,208,190,209,130,208,178,208,181,209,130,209,129,209,130,208,178 +,208,184,208,184,208,191,209,128,208,190,208,184,208,183,208,178,208,190,208,180 +,209,129,209,130,208,178,208,176,208,177,208,181,208,183,208,190,208,191,208,176 +,209,129,208,189,208,190,209,129,209,130,208,184,224,164,170,224,165,129,224,164 +,184,224,165,141,224,164,164,224,164,191,224,164,149,224,164,190,224,164,149,224 +,164,190,224,164,130,224,164,151,224,165,141,224,164,176,224,165,135,224,164,184 +,224,164,137,224,164,168,224,165,141,224,164,185,224,165,139,224,164,130,224,164 +,168,224,165,135,224,164,181,224,164,191,224,164,167,224,164,190,224,164,168,224 +,164,184,224,164,173,224,164,190,224,164,171,224,164,191,224,164,149,224,165,141 +,224,164,184,224,164,191,224,164,130,224,164,151,224,164,184,224,165,129,224,164 +,176,224,164,149,224,165,141,224,164,183,224,164,191,224,164,164,224,164,149,224 +,165,137,224,164,170,224,165,128,224,164,176,224,164,190,224,164,135,224,164,159 +,224,164,181,224,164,191,224,164,156,224,165,141,224,164,158,224,164,190,224,164 +,170,224,164,168,224,164,149,224,164,190,224,164,176,224,165,141,224,164,176,224 +,164,181,224,164,190,224,164,136,224,164,184,224,164,149,224,165,141,224,164,176 +,224,164,191,224,164,175,224,164,164,224,164,190 +} +/* GENERATED CODE END */ +; +#endif /* !BROTLI_EXTERNAL_DICTIONARY_DATA */ + +#if !defined(BROTLI_EXTERNAL_DICTIONARY_DATA) +static const BrotliDictionary kBrotliDictionary = { +#else +static BrotliDictionary kBrotliDictionary = { +#endif + /* size_bits_by_length */ + { + 0, 0, 0, 0, 10, 10, 11, 11, + 10, 10, 10, 10, 10, 9, 9, 8, + 7, 7, 8, 7, 7, 6, 6, 5, + 5, 0, 0, 0, 0, 0, 0, 0 + }, + + /* offsets_by_length */ + { + 0, 0, 0, 0, 0, 4096, 9216, 21504, + 35840, 44032, 53248, 63488, 74752, 87040, 93696, 100864, + 104704, 106752, 108928, 113536, 115968, 118528, 119872, 121280, + 122016, 122784, 122784, 122784, 122784, 122784, 122784, 122784 + }, + + /* data_size == sizeof(kBrotliDictionaryData) */ + 122784, + + /* data */ +#if defined(BROTLI_EXTERNAL_DICTIONARY_DATA) + NULL +#else + kBrotliDictionaryData +#endif +}; + +const BrotliDictionary* BrotliGetDictionary(void) { + return &kBrotliDictionary; +} + +void BrotliSetDictionaryData(const uint8_t* data) { +#if defined(BROTLI_EXTERNAL_DICTIONARY_DATA) + if (!!data && !kBrotliDictionary.data) { + kBrotliDictionary.data = data; + } +#else + BROTLI_UNUSED(data); // Appease -Werror=unused-parameter +#endif +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif diff --git a/modules/brotli/common/dictionary.h b/modules/brotli/common/dictionary.h new file mode 100644 index 0000000000..b1c6f7f580 --- /dev/null +++ b/modules/brotli/common/dictionary.h @@ -0,0 +1,64 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Collection of static dictionary words. */ + +#ifndef BROTLI_COMMON_DICTIONARY_H_ +#define BROTLI_COMMON_DICTIONARY_H_ + +#include <brotli/port.h> +#include <brotli/types.h> + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +typedef struct BrotliDictionary { + /** + * Number of bits to encode index of dictionary word in a bucket. + * + * Specification: Appendix A. Static Dictionary Data + * + * Words in a dictionary are bucketed by length. + * @c 0 means that there are no words of a given length. + * Dictionary consists of words with length of [4..24] bytes. + * Values at [0..3] and [25..31] indices should not be addressed. + */ + uint8_t size_bits_by_length[32]; + + /* assert(offset[i + 1] == offset[i] + (bits[i] ? (i << bits[i]) : 0)) */ + uint32_t offsets_by_length[32]; + + /* assert(data_size == offsets_by_length[31]) */ + size_t data_size; + + /* Data array is not bound, and should obey to size_bits_by_length values. + Specified size matches default (RFC 7932) dictionary. Its size is + defined by data_size */ + const uint8_t* data; +} BrotliDictionary; + +BROTLI_COMMON_API const BrotliDictionary* BrotliGetDictionary(void); + +/** + * Sets dictionary data. + * + * When dictionary data is already set / present, this method is no-op. + * + * Dictionary data MUST be provided before BrotliGetDictionary is invoked. + * This method is used ONLY in multi-client environment (e.g. C + Java), + * to reduce storage by sharing single dictionary between implementations. + */ +BROTLI_COMMON_API void BrotliSetDictionaryData(const uint8_t* data); + +#define BROTLI_MIN_DICTIONARY_WORD_LENGTH 4 +#define BROTLI_MAX_DICTIONARY_WORD_LENGTH 24 + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_COMMON_DICTIONARY_H_ */ diff --git a/modules/brotli/common/platform.c b/modules/brotli/common/platform.c new file mode 100644 index 0000000000..25d84a9467 --- /dev/null +++ b/modules/brotli/common/platform.c @@ -0,0 +1,23 @@ +/* Copyright 2016 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +#include <stdlib.h> + +#include <brotli/types.h> + +#include "platform.h" + +/* Default brotli_alloc_func */ +void* BrotliDefaultAllocFunc(void* opaque, size_t size) { + BROTLI_UNUSED(opaque); + return malloc(size); +} + +/* Default brotli_free_func */ +void BrotliDefaultFreeFunc(void* opaque, void* address) { + BROTLI_UNUSED(opaque); + free(address); +} diff --git a/modules/brotli/common/platform.h b/modules/brotli/common/platform.h new file mode 100644 index 0000000000..7406f3fe69 --- /dev/null +++ b/modules/brotli/common/platform.h @@ -0,0 +1,541 @@ +/* Copyright 2016 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Macros for compiler / platform specific features and build options. + + Build options are: + * BROTLI_BUILD_32_BIT disables 64-bit optimizations + * BROTLI_BUILD_64_BIT forces to use 64-bit optimizations + * BROTLI_BUILD_BIG_ENDIAN forces to use big-endian optimizations + * BROTLI_BUILD_ENDIAN_NEUTRAL disables endian-aware optimizations + * BROTLI_BUILD_LITTLE_ENDIAN forces to use little-endian optimizations + * BROTLI_BUILD_NO_RBIT disables "rbit" optimization for ARM CPUs + * BROTLI_BUILD_NO_UNALIGNED_READ_FAST forces off the fast-unaligned-read + optimizations (mainly for testing purposes) + * BROTLI_DEBUG dumps file name and line number when decoder detects stream + or memory error + * BROTLI_ENABLE_LOG enables asserts and dumps various state information + * BROTLI_ENABLE_DUMP overrides default "dump" behaviour +*/ + +#ifndef BROTLI_COMMON_PLATFORM_H_ +#define BROTLI_COMMON_PLATFORM_H_ + +#include <string.h> /* memcpy */ + +#include <brotli/port.h> +#include <brotli/types.h> + +#if defined(OS_LINUX) || defined(OS_CYGWIN) || defined(__EMSCRIPTEN__) +#include <endian.h> +#elif defined(OS_FREEBSD) +#include <machine/endian.h> +#elif defined(OS_MACOSX) +#include <machine/endian.h> +/* Let's try and follow the Linux convention */ +#define BROTLI_X_BYTE_ORDER BYTE_ORDER +#define BROTLI_X_LITTLE_ENDIAN LITTLE_ENDIAN +#define BROTLI_X_BIG_ENDIAN BIG_ENDIAN +#endif + +#if BROTLI_MSVC_VERSION_CHECK(18, 0, 0) +#include <intrin.h> +#endif + +#if defined(BROTLI_ENABLE_LOG) || defined(BROTLI_DEBUG) +#include <assert.h> +#include <stdio.h> +#endif + +/* The following macros were borrowed from https://github.com/nemequ/hedley + * with permission of original author - Evan Nemerson <evan@nemerson.com> */ + +/* >>> >>> >>> hedley macros */ + +/* Define "BROTLI_PREDICT_TRUE" and "BROTLI_PREDICT_FALSE" macros for capable + compilers. + +To apply compiler hint, enclose the branching condition into macros, like this: + + if (BROTLI_PREDICT_TRUE(zero == 0)) { + // main execution path + } else { + // compiler should place this code outside of main execution path + } + +OR: + + if (BROTLI_PREDICT_FALSE(something_rare_or_unexpected_happens)) { + // compiler should place this code outside of main execution path + } + +*/ +#if BROTLI_GNUC_HAS_BUILTIN(__builtin_expect, 3, 0, 0) || \ + BROTLI_INTEL_VERSION_CHECK(16, 0, 0) || \ + BROTLI_SUNPRO_VERSION_CHECK(5, 15, 0) || \ + BROTLI_ARM_VERSION_CHECK(4, 1, 0) || \ + BROTLI_IBM_VERSION_CHECK(10, 1, 0) || \ + BROTLI_TI_VERSION_CHECK(7, 3, 0) || \ + BROTLI_TINYC_VERSION_CHECK(0, 9, 27) +#define BROTLI_PREDICT_TRUE(x) (__builtin_expect(!!(x), 1)) +#define BROTLI_PREDICT_FALSE(x) (__builtin_expect(x, 0)) +#else +#define BROTLI_PREDICT_FALSE(x) (x) +#define BROTLI_PREDICT_TRUE(x) (x) +#endif + +#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) && \ + !defined(__cplusplus) +#define BROTLI_RESTRICT restrict +#elif BROTLI_GNUC_VERSION_CHECK(3, 1, 0) || \ + BROTLI_MSVC_VERSION_CHECK(14, 0, 0) || \ + BROTLI_INTEL_VERSION_CHECK(16, 0, 0) || \ + BROTLI_ARM_VERSION_CHECK(4, 1, 0) || \ + BROTLI_IBM_VERSION_CHECK(10, 1, 0) || \ + BROTLI_PGI_VERSION_CHECK(17, 10, 0) || \ + BROTLI_TI_VERSION_CHECK(8, 0, 0) || \ + BROTLI_IAR_VERSION_CHECK(8, 0, 0) || \ + (BROTLI_SUNPRO_VERSION_CHECK(5, 14, 0) && defined(__cplusplus)) +#define BROTLI_RESTRICT __restrict +#elif BROTLI_SUNPRO_VERSION_CHECK(5, 3, 0) && !defined(__cplusplus) +#define BROTLI_RESTRICT _Restrict +#else +#define BROTLI_RESTRICT +#endif + +#if (defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L)) || \ + (defined(__cplusplus) && (__cplusplus >= 199711L)) +#define BROTLI_MAYBE_INLINE inline +#elif defined(__GNUC_STDC_INLINE__) || defined(__GNUC_GNU_INLINE__) || \ + BROTLI_ARM_VERSION_CHECK(6, 2, 0) +#define BROTLI_MAYBE_INLINE __inline__ +#elif BROTLI_MSVC_VERSION_CHECK(12, 0, 0) || \ + BROTLI_ARM_VERSION_CHECK(4, 1, 0) || BROTLI_TI_VERSION_CHECK(8, 0, 0) +#define BROTLI_MAYBE_INLINE __inline +#else +#define BROTLI_MAYBE_INLINE +#endif + +#if BROTLI_GNUC_HAS_ATTRIBUTE(always_inline, 4, 0, 0) || \ + BROTLI_INTEL_VERSION_CHECK(16, 0, 0) || \ + BROTLI_SUNPRO_VERSION_CHECK(5, 11, 0) || \ + BROTLI_ARM_VERSION_CHECK(4, 1, 0) || \ + BROTLI_IBM_VERSION_CHECK(10, 1, 0) || \ + BROTLI_TI_VERSION_CHECK(8, 0, 0) || \ + (BROTLI_TI_VERSION_CHECK(7, 3, 0) && defined(__TI_GNU_ATTRIBUTE_SUPPORT__)) +#define BROTLI_INLINE BROTLI_MAYBE_INLINE __attribute__((__always_inline__)) +#elif BROTLI_MSVC_VERSION_CHECK(12, 0, 0) +#define BROTLI_INLINE BROTLI_MAYBE_INLINE __forceinline +#elif BROTLI_TI_VERSION_CHECK(7, 0, 0) && defined(__cplusplus) +#define BROTLI_INLINE BROTLI_MAYBE_INLINE _Pragma("FUNC_ALWAYS_INLINE;") +#elif BROTLI_IAR_VERSION_CHECK(8, 0, 0) +#define BROTLI_INLINE BROTLI_MAYBE_INLINE _Pragma("inline=forced") +#else +#define BROTLI_INLINE BROTLI_MAYBE_INLINE +#endif + +#if BROTLI_GNUC_HAS_ATTRIBUTE(noinline, 4, 0, 0) || \ + BROTLI_INTEL_VERSION_CHECK(16, 0, 0) || \ + BROTLI_SUNPRO_VERSION_CHECK(5, 11, 0) || \ + BROTLI_ARM_VERSION_CHECK(4, 1, 0) || \ + BROTLI_IBM_VERSION_CHECK(10, 1, 0) || \ + BROTLI_TI_VERSION_CHECK(8, 0, 0) || \ + (BROTLI_TI_VERSION_CHECK(7, 3, 0) && defined(__TI_GNU_ATTRIBUTE_SUPPORT__)) +#define BROTLI_NOINLINE __attribute__((__noinline__)) +#elif BROTLI_MSVC_VERSION_CHECK(13, 10, 0) +#define BROTLI_NOINLINE __declspec(noinline) +#elif BROTLI_PGI_VERSION_CHECK(10, 2, 0) +#define BROTLI_NOINLINE _Pragma("noinline") +#elif BROTLI_TI_VERSION_CHECK(6, 0, 0) && defined(__cplusplus) +#define BROTLI_NOINLINE _Pragma("FUNC_CANNOT_INLINE;") +#elif BROTLI_IAR_VERSION_CHECK(8, 0, 0) +#define BROTLI_NOINLINE _Pragma("inline=never") +#else +#define BROTLI_NOINLINE +#endif + +/* <<< <<< <<< end of hedley macros. */ + +#if BROTLI_GNUC_HAS_ATTRIBUTE(unused, 2, 7, 0) || \ + BROTLI_INTEL_VERSION_CHECK(16, 0, 0) +#define BROTLI_UNUSED_FUNCTION static BROTLI_INLINE __attribute__ ((unused)) +#else +#define BROTLI_UNUSED_FUNCTION static BROTLI_INLINE +#endif + +#if BROTLI_GNUC_HAS_ATTRIBUTE(aligned, 2, 7, 0) +#define BROTLI_ALIGNED(N) __attribute__((aligned(N))) +#else +#define BROTLI_ALIGNED(N) +#endif + +#if (defined(__ARM_ARCH) && (__ARM_ARCH == 7)) || \ + (defined(M_ARM) && (M_ARM == 7)) +#define BROTLI_TARGET_ARMV7 +#endif /* ARMv7 */ + +#if (defined(__ARM_ARCH) && (__ARM_ARCH == 8)) || \ + defined(__aarch64__) || defined(__ARM64_ARCH_8__) +#define BROTLI_TARGET_ARMV8_ANY + +#if defined(__ARM_32BIT_STATE) +#define BROTLI_TARGET_ARMV8_32 +#elif defined(__ARM_64BIT_STATE) +#define BROTLI_TARGET_ARMV8_64 +#endif + +#endif /* ARMv8 */ + +#if defined(__ARM_NEON__) || defined(__ARM_NEON) +#define BROTLI_TARGET_NEON +#endif + +#if defined(__i386) || defined(_M_IX86) +#define BROTLI_TARGET_X86 +#endif + +#if defined(__x86_64__) || defined(_M_X64) +#define BROTLI_TARGET_X64 +#endif + +#if defined(__PPC64__) +#define BROTLI_TARGET_POWERPC64 +#endif + +#if defined(__riscv) && defined(__riscv_xlen) && __riscv_xlen == 64 +#define BROTLI_TARGET_RISCV64 +#endif + +#if defined(__loongarch_lp64) +#define BROTLI_TARGET_LOONGARCH64 +#endif + +#if defined(BROTLI_TARGET_X64) || defined(BROTLI_TARGET_ARMV8_64) || \ + defined(BROTLI_TARGET_POWERPC64) || defined(BROTLI_TARGET_RISCV64) || \ + defined(BROTLI_TARGET_LOONGARCH64) +#define BROTLI_TARGET_64_BITS 1 +#else +#define BROTLI_TARGET_64_BITS 0 +#endif + +#if defined(BROTLI_BUILD_64_BIT) +#define BROTLI_64_BITS 1 +#elif defined(BROTLI_BUILD_32_BIT) +#define BROTLI_64_BITS 0 +#else +#define BROTLI_64_BITS BROTLI_TARGET_64_BITS +#endif + +#if (BROTLI_64_BITS) +#define brotli_reg_t uint64_t +#else +#define brotli_reg_t uint32_t +#endif + +#if defined(BROTLI_BUILD_BIG_ENDIAN) +#define BROTLI_BIG_ENDIAN 1 +#elif defined(BROTLI_BUILD_LITTLE_ENDIAN) +#define BROTLI_LITTLE_ENDIAN 1 +#elif defined(BROTLI_BUILD_ENDIAN_NEUTRAL) +/* Just break elif chain. */ +#elif defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__) +#define BROTLI_LITTLE_ENDIAN 1 +#elif defined(_WIN32) || defined(BROTLI_TARGET_X64) +/* Win32 & x64 can currently always be assumed to be little endian */ +#define BROTLI_LITTLE_ENDIAN 1 +#elif defined(__BYTE_ORDER__) && (__BYTE_ORDER__ == __ORDER_BIG_ENDIAN__) +#define BROTLI_BIG_ENDIAN 1 +#elif defined(BROTLI_X_BYTE_ORDER) +#if BROTLI_X_BYTE_ORDER == BROTLI_X_LITTLE_ENDIAN +#define BROTLI_LITTLE_ENDIAN 1 +#elif BROTLI_X_BYTE_ORDER == BROTLI_X_BIG_ENDIAN +#define BROTLI_BIG_ENDIAN 1 +#endif +#endif /* BROTLI_X_BYTE_ORDER */ + +#if !defined(BROTLI_LITTLE_ENDIAN) +#define BROTLI_LITTLE_ENDIAN 0 +#endif + +#if !defined(BROTLI_BIG_ENDIAN) +#define BROTLI_BIG_ENDIAN 0 +#endif + +#if defined(BROTLI_X_BYTE_ORDER) +#undef BROTLI_X_BYTE_ORDER +#undef BROTLI_X_LITTLE_ENDIAN +#undef BROTLI_X_BIG_ENDIAN +#endif + +#if defined(BROTLI_BUILD_NO_UNALIGNED_READ_FAST) +#define BROTLI_UNALIGNED_READ_FAST (!!0) +#elif defined(BROTLI_TARGET_X86) || defined(BROTLI_TARGET_X64) || \ + defined(BROTLI_TARGET_ARMV7) || defined(BROTLI_TARGET_ARMV8_ANY) || \ + defined(BROTLI_TARGET_RISCV64) || defined(BROTLI_TARGET_LOONGARCH64) +/* These targets are known to generate efficient code for unaligned reads + * (e.g. a single instruction, not multiple 1-byte loads, shifted and or'd + * together). */ +#define BROTLI_UNALIGNED_READ_FAST (!!1) +#else +#define BROTLI_UNALIGNED_READ_FAST (!!0) +#endif + +/* Portable unaligned memory access: read / write values via memcpy. */ +static BROTLI_INLINE uint16_t BrotliUnalignedRead16(const void* p) { + uint16_t t; + memcpy(&t, p, sizeof t); + return t; +} +static BROTLI_INLINE uint32_t BrotliUnalignedRead32(const void* p) { + uint32_t t; + memcpy(&t, p, sizeof t); + return t; +} +static BROTLI_INLINE uint64_t BrotliUnalignedRead64(const void* p) { + uint64_t t; + memcpy(&t, p, sizeof t); + return t; +} +static BROTLI_INLINE void BrotliUnalignedWrite64(void* p, uint64_t v) { + memcpy(p, &v, sizeof v); +} + +#if BROTLI_LITTLE_ENDIAN +/* Straight endianness. Just read / write values. */ +#define BROTLI_UNALIGNED_LOAD16LE BrotliUnalignedRead16 +#define BROTLI_UNALIGNED_LOAD32LE BrotliUnalignedRead32 +#define BROTLI_UNALIGNED_LOAD64LE BrotliUnalignedRead64 +#define BROTLI_UNALIGNED_STORE64LE BrotliUnalignedWrite64 +#elif BROTLI_BIG_ENDIAN /* BROTLI_LITTLE_ENDIAN */ +/* Explain compiler to byte-swap values. */ +#define BROTLI_BSWAP16_(V) ((uint16_t)( \ + (((V) & 0xFFU) << 8) | \ + (((V) >> 8) & 0xFFU))) +static BROTLI_INLINE uint16_t BROTLI_UNALIGNED_LOAD16LE(const void* p) { + uint16_t value = BrotliUnalignedRead16(p); + return BROTLI_BSWAP16_(value); +} +#define BROTLI_BSWAP32_(V) ( \ + (((V) & 0xFFU) << 24) | (((V) & 0xFF00U) << 8) | \ + (((V) >> 8) & 0xFF00U) | (((V) >> 24) & 0xFFU)) +static BROTLI_INLINE uint32_t BROTLI_UNALIGNED_LOAD32LE(const void* p) { + uint32_t value = BrotliUnalignedRead32(p); + return BROTLI_BSWAP32_(value); +} +#define BROTLI_BSWAP64_(V) ( \ + (((V) & 0xFFU) << 56) | (((V) & 0xFF00U) << 40) | \ + (((V) & 0xFF0000U) << 24) | (((V) & 0xFF000000U) << 8) | \ + (((V) >> 8) & 0xFF000000U) | (((V) >> 24) & 0xFF0000U) | \ + (((V) >> 40) & 0xFF00U) | (((V) >> 56) & 0xFFU)) +static BROTLI_INLINE uint64_t BROTLI_UNALIGNED_LOAD64LE(const void* p) { + uint64_t value = BrotliUnalignedRead64(p); + return BROTLI_BSWAP64_(value); +} +static BROTLI_INLINE void BROTLI_UNALIGNED_STORE64LE(void* p, uint64_t v) { + uint64_t value = BROTLI_BSWAP64_(v); + BrotliUnalignedWrite64(p, value); +} +#else /* BROTLI_LITTLE_ENDIAN */ +/* Read / store values byte-wise; hopefully compiler will understand. */ +static BROTLI_INLINE uint16_t BROTLI_UNALIGNED_LOAD16LE(const void* p) { + const uint8_t* in = (const uint8_t*)p; + return (uint16_t)(in[0] | (in[1] << 8)); +} +static BROTLI_INLINE uint32_t BROTLI_UNALIGNED_LOAD32LE(const void* p) { + const uint8_t* in = (const uint8_t*)p; + uint32_t value = (uint32_t)(in[0]); + value |= (uint32_t)(in[1]) << 8; + value |= (uint32_t)(in[2]) << 16; + value |= (uint32_t)(in[3]) << 24; + return value; +} +static BROTLI_INLINE uint64_t BROTLI_UNALIGNED_LOAD64LE(const void* p) { + const uint8_t* in = (const uint8_t*)p; + uint64_t value = (uint64_t)(in[0]); + value |= (uint64_t)(in[1]) << 8; + value |= (uint64_t)(in[2]) << 16; + value |= (uint64_t)(in[3]) << 24; + value |= (uint64_t)(in[4]) << 32; + value |= (uint64_t)(in[5]) << 40; + value |= (uint64_t)(in[6]) << 48; + value |= (uint64_t)(in[7]) << 56; + return value; +} +static BROTLI_INLINE void BROTLI_UNALIGNED_STORE64LE(void* p, uint64_t v) { + uint8_t* out = (uint8_t*)p; + out[0] = (uint8_t)v; + out[1] = (uint8_t)(v >> 8); + out[2] = (uint8_t)(v >> 16); + out[3] = (uint8_t)(v >> 24); + out[4] = (uint8_t)(v >> 32); + out[5] = (uint8_t)(v >> 40); + out[6] = (uint8_t)(v >> 48); + out[7] = (uint8_t)(v >> 56); +} +#endif /* BROTLI_LITTLE_ENDIAN */ + +static BROTLI_INLINE void* BROTLI_UNALIGNED_LOAD_PTR(const void* p) { + void* v; + memcpy(&v, p, sizeof(void*)); + return v; +} + +static BROTLI_INLINE void BROTLI_UNALIGNED_STORE_PTR(void* p, const void* v) { + memcpy(p, &v, sizeof(void*)); +} + +/* BROTLI_IS_CONSTANT macros returns true for compile-time constants. */ +#if BROTLI_GNUC_HAS_BUILTIN(__builtin_constant_p, 3, 0, 1) || \ + BROTLI_INTEL_VERSION_CHECK(16, 0, 0) +#define BROTLI_IS_CONSTANT(x) (!!__builtin_constant_p(x)) +#else +#define BROTLI_IS_CONSTANT(x) (!!0) +#endif + +#if defined(BROTLI_TARGET_ARMV7) || defined(BROTLI_TARGET_ARMV8_ANY) +#define BROTLI_HAS_UBFX (!!1) +#else +#define BROTLI_HAS_UBFX (!!0) +#endif + +#if defined(BROTLI_ENABLE_LOG) +#define BROTLI_LOG(x) printf x +#else +#define BROTLI_LOG(x) +#endif + +#if defined(BROTLI_DEBUG) || defined(BROTLI_ENABLE_LOG) +#define BROTLI_ENABLE_DUMP_DEFAULT 1 +#define BROTLI_DCHECK(x) assert(x) +#else +#define BROTLI_ENABLE_DUMP_DEFAULT 0 +#define BROTLI_DCHECK(x) +#endif + +#if !defined(BROTLI_ENABLE_DUMP) +#define BROTLI_ENABLE_DUMP BROTLI_ENABLE_DUMP_DEFAULT +#endif + +#if BROTLI_ENABLE_DUMP +static BROTLI_INLINE void BrotliDump(const char* f, int l, const char* fn) { + fprintf(stderr, "%s:%d (%s)\n", f, l, fn); + fflush(stderr); +} +#define BROTLI_DUMP() BrotliDump(__FILE__, __LINE__, __FUNCTION__) +#else +#define BROTLI_DUMP() (void)(0) +#endif + +/* BrotliRBit assumes brotli_reg_t fits native CPU register type. */ +#if (BROTLI_64_BITS == BROTLI_TARGET_64_BITS) +/* TODO(eustas): add appropriate icc/sunpro/arm/ibm/ti checks. */ +#if (BROTLI_GNUC_VERSION_CHECK(3, 0, 0) || defined(__llvm__)) && \ + !defined(BROTLI_BUILD_NO_RBIT) +#if defined(BROTLI_TARGET_ARMV7) || defined(BROTLI_TARGET_ARMV8_ANY) +/* TODO(eustas): detect ARMv6T2 and enable this code for it. */ +static BROTLI_INLINE brotli_reg_t BrotliRBit(brotli_reg_t input) { + brotli_reg_t output; + __asm__("rbit %0, %1\n" : "=r"(output) : "r"(input)); + return output; +} +#define BROTLI_RBIT(x) BrotliRBit(x) +#endif /* armv7 / armv8 */ +#endif /* gcc || clang */ +#endif /* brotli_reg_t is native */ +#if !defined(BROTLI_RBIT) +static BROTLI_INLINE void BrotliRBit(void) { /* Should break build if used. */ } +#endif /* BROTLI_RBIT */ + +#define BROTLI_REPEAT_4(X) {X; X; X; X;} +#define BROTLI_REPEAT_5(X) {X; X; X; X; X;} +#define BROTLI_REPEAT_6(X) {X; X; X; X; X; X;} + +#define BROTLI_UNUSED(X) (void)(X) + +#define BROTLI_MIN_MAX(T) \ + static BROTLI_INLINE T brotli_min_ ## T (T a, T b) { return a < b ? a : b; } \ + static BROTLI_INLINE T brotli_max_ ## T (T a, T b) { return a > b ? a : b; } +BROTLI_MIN_MAX(double) BROTLI_MIN_MAX(float) BROTLI_MIN_MAX(int) +BROTLI_MIN_MAX(size_t) BROTLI_MIN_MAX(uint32_t) BROTLI_MIN_MAX(uint8_t) +#undef BROTLI_MIN_MAX +#define BROTLI_MIN(T, A, B) (brotli_min_ ## T((A), (B))) +#define BROTLI_MAX(T, A, B) (brotli_max_ ## T((A), (B))) + +#define BROTLI_SWAP(T, A, I, J) { \ + T __brotli_swap_tmp = (A)[(I)]; \ + (A)[(I)] = (A)[(J)]; \ + (A)[(J)] = __brotli_swap_tmp; \ +} + +#if BROTLI_64_BITS +#if BROTLI_GNUC_HAS_BUILTIN(__builtin_ctzll, 3, 4, 0) || \ + BROTLI_INTEL_VERSION_CHECK(16, 0, 0) +#define BROTLI_TZCNT64 __builtin_ctzll +#elif BROTLI_MSVC_VERSION_CHECK(18, 0, 0) +#if defined(BROTLI_TARGET_X64) +#define BROTLI_TZCNT64 _tzcnt_u64 +#else /* BROTLI_TARGET_X64 */ +static BROTLI_INLINE uint32_t BrotliBsf64Msvc(uint64_t x) { + uint32_t lsb; + _BitScanForward64(&lsb, x); + return lsb; +} +#define BROTLI_TZCNT64 BrotliBsf64Msvc +#endif /* BROTLI_TARGET_X64 */ +#endif /* __builtin_ctzll */ +#endif /* BROTLI_64_BITS */ + +#if BROTLI_GNUC_HAS_BUILTIN(__builtin_clz, 3, 4, 0) || \ + BROTLI_INTEL_VERSION_CHECK(16, 0, 0) +#define BROTLI_BSR32(x) (31u ^ (uint32_t)__builtin_clz(x)) +#elif BROTLI_MSVC_VERSION_CHECK(18, 0, 0) +static BROTLI_INLINE uint32_t BrotliBsr32Msvc(uint32_t x) { + unsigned long msb; + _BitScanReverse(&msb, x); + return (uint32_t)msb; +} +#define BROTLI_BSR32 BrotliBsr32Msvc +#endif /* __builtin_clz */ + +/* Default brotli_alloc_func */ +BROTLI_COMMON_API void* BrotliDefaultAllocFunc(void* opaque, size_t size); + +/* Default brotli_free_func */ +BROTLI_COMMON_API void BrotliDefaultFreeFunc(void* opaque, void* address); + +BROTLI_UNUSED_FUNCTION void BrotliSuppressUnusedFunctions(void) { + BROTLI_UNUSED(&BrotliSuppressUnusedFunctions); + BROTLI_UNUSED(&BrotliUnalignedRead16); + BROTLI_UNUSED(&BrotliUnalignedRead32); + BROTLI_UNUSED(&BrotliUnalignedRead64); + BROTLI_UNUSED(&BrotliUnalignedWrite64); + BROTLI_UNUSED(&BROTLI_UNALIGNED_LOAD16LE); + BROTLI_UNUSED(&BROTLI_UNALIGNED_LOAD32LE); + BROTLI_UNUSED(&BROTLI_UNALIGNED_LOAD64LE); + BROTLI_UNUSED(&BROTLI_UNALIGNED_STORE64LE); + BROTLI_UNUSED(&BROTLI_UNALIGNED_LOAD_PTR); + BROTLI_UNUSED(&BROTLI_UNALIGNED_STORE_PTR); + BROTLI_UNUSED(&BrotliRBit); + BROTLI_UNUSED(&brotli_min_double); + BROTLI_UNUSED(&brotli_max_double); + BROTLI_UNUSED(&brotli_min_float); + BROTLI_UNUSED(&brotli_max_float); + BROTLI_UNUSED(&brotli_min_int); + BROTLI_UNUSED(&brotli_max_int); + BROTLI_UNUSED(&brotli_min_size_t); + BROTLI_UNUSED(&brotli_max_size_t); + BROTLI_UNUSED(&brotli_min_uint32_t); + BROTLI_UNUSED(&brotli_max_uint32_t); + BROTLI_UNUSED(&brotli_min_uint8_t); + BROTLI_UNUSED(&brotli_max_uint8_t); + BROTLI_UNUSED(&BrotliDefaultAllocFunc); + BROTLI_UNUSED(&BrotliDefaultFreeFunc); +#if BROTLI_ENABLE_DUMP + BROTLI_UNUSED(&BrotliDump); +#endif +} + +#endif /* BROTLI_COMMON_PLATFORM_H_ */ diff --git a/modules/brotli/common/shared_dictionary.c b/modules/brotli/common/shared_dictionary.c new file mode 100644 index 0000000000..49f1c9b075 --- /dev/null +++ b/modules/brotli/common/shared_dictionary.c @@ -0,0 +1,521 @@ +/* Copyright 2017 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Shared Dictionary definition and utilities. */ + +#include <brotli/shared_dictionary.h> + +#include <memory.h> +#include <stdlib.h> /* malloc, free */ +#include <stdio.h> + +#include "dictionary.h" +#include "platform.h" +#include "shared_dictionary_internal.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +#if defined(BROTLI_EXPERIMENTAL) + +#define BROTLI_NUM_ENCODED_LENGTHS (SHARED_BROTLI_MAX_DICTIONARY_WORD_LENGTH \ + - SHARED_BROTLI_MIN_DICTIONARY_WORD_LENGTH + 1) + +/* Max allowed by spec */ +#define BROTLI_MAX_SIZE_BITS 15u + +/* Returns BROTLI_TRUE on success, BROTLI_FALSE on failure. */ +static BROTLI_BOOL ReadBool(const uint8_t* encoded, size_t size, size_t* pos, + BROTLI_BOOL* result) { + uint8_t value; + size_t position = *pos; + if (position >= size) return BROTLI_FALSE; /* past file end */ + value = encoded[position++]; + if (value > 1) return BROTLI_FALSE; /* invalid bool */ + *result = TO_BROTLI_BOOL(value); + *pos = position; + return BROTLI_TRUE; /* success */ +} + +/* Returns BROTLI_TRUE on success, BROTLI_FALSE on failure. */ +static BROTLI_BOOL ReadUint8(const uint8_t* encoded, size_t size, size_t* pos, + uint8_t* result) { + size_t position = *pos; + if (position + sizeof(uint8_t) > size) return BROTLI_FALSE; + *result = encoded[position++]; + *pos = position; + return BROTLI_TRUE; +} + +/* Returns BROTLI_TRUE on success, BROTLI_FALSE on failure. */ +static BROTLI_BOOL ReadUint16(const uint8_t* encoded, size_t size, size_t* pos, + uint16_t* result) { + size_t position = *pos; + if (position + sizeof(uint16_t) > size) return BROTLI_FALSE; + *result = BROTLI_UNALIGNED_LOAD16LE(&encoded[position]); + position += 2; + *pos = position; + return BROTLI_TRUE; +} + +/* Reads a varint into a uint32_t, and returns error if it's too large */ +/* Returns BROTLI_TRUE on success, BROTLI_FALSE on failure. */ +static BROTLI_BOOL ReadVarint32(const uint8_t* encoded, size_t size, + size_t* pos, uint32_t* result) { + int num = 0; + uint8_t byte; + *result = 0; + for (;;) { + if (*pos >= size) return BROTLI_FALSE; + byte = encoded[(*pos)++]; + if (num == 4 && byte > 15) return BROTLI_FALSE; + *result |= (uint32_t)(byte & 127) << (num * 7); + if (byte < 128) return BROTLI_TRUE; + num++; + } +} + +/* Returns the total length of word list. */ +static size_t BrotliSizeBitsToOffsets(const uint8_t* size_bits_by_length, + uint32_t* offsets_by_length) { + uint32_t pos = 0; + uint32_t i; + for (i = 0; i <= SHARED_BROTLI_MAX_DICTIONARY_WORD_LENGTH; i++) { + offsets_by_length[i] = pos; + if (size_bits_by_length[i] != 0) { + pos += i << size_bits_by_length[i]; + } + } + return pos; +} + +static BROTLI_BOOL ParseWordList(size_t size, const uint8_t* encoded, + size_t* pos, BrotliDictionary* out) { + size_t offset; + size_t i; + size_t position = *pos; + if (position + BROTLI_NUM_ENCODED_LENGTHS > size) { + return BROTLI_FALSE; + } + + memset(out->size_bits_by_length, 0, SHARED_BROTLI_MIN_DICTIONARY_WORD_LENGTH); + memcpy(out->size_bits_by_length + SHARED_BROTLI_MIN_DICTIONARY_WORD_LENGTH, + &encoded[position], BROTLI_NUM_ENCODED_LENGTHS); + for (i = SHARED_BROTLI_MIN_DICTIONARY_WORD_LENGTH; + i <= SHARED_BROTLI_MAX_DICTIONARY_WORD_LENGTH; i++) { + if (out->size_bits_by_length[i] > BROTLI_MAX_SIZE_BITS) { + return BROTLI_FALSE; + } + } + position += BROTLI_NUM_ENCODED_LENGTHS; + offset = BrotliSizeBitsToOffsets( + out->size_bits_by_length, out->offsets_by_length); + + out->data = &encoded[position]; + out->data_size = offset; + position += offset; + if (position > size) return BROTLI_FALSE; + *pos = position; + return BROTLI_TRUE; +} + +/* Computes the cutOffTransforms of a BrotliTransforms which already has the + transforms data correctly filled in. */ +static void ComputeCutoffTransforms(BrotliTransforms* transforms) { + uint32_t i; + for (i = 0; i < BROTLI_TRANSFORMS_MAX_CUT_OFF + 1; i++) { + transforms->cutOffTransforms[i] = -1; + } + for (i = 0; i < transforms->num_transforms; i++) { + const uint8_t* prefix = BROTLI_TRANSFORM_PREFIX(transforms, i); + uint8_t type = BROTLI_TRANSFORM_TYPE(transforms, i); + const uint8_t* suffix = BROTLI_TRANSFORM_SUFFIX(transforms, i); + if (type <= BROTLI_TRANSFORM_OMIT_LAST_9 && *prefix == 0 && *suffix == 0 && + transforms->cutOffTransforms[type] == -1) { + transforms->cutOffTransforms[type] = (int16_t)i; + } + } +} + +static BROTLI_BOOL ParsePrefixSuffixTable(size_t size, const uint8_t* encoded, + size_t* pos, BrotliTransforms* out, uint16_t* out_table, + size_t* out_table_size) { + size_t position = *pos; + size_t offset = 0; + size_t stringlet_count = 0; /* NUM_PREFIX_SUFFIX */ + size_t data_length = 0; + + /* PREFIX_SUFFIX_LENGTH */ + if (!ReadUint16(encoded, size, &position, &out->prefix_suffix_size)) { + return BROTLI_FALSE; + } + data_length = out->prefix_suffix_size; + + /* Must at least have space for null terminator. */ + if (data_length < 1) return BROTLI_FALSE; + out->prefix_suffix = &encoded[position]; + if (position + data_length >= size) return BROTLI_FALSE; + while (BROTLI_TRUE) { + /* STRING_LENGTH */ + size_t stringlet_len = encoded[position + offset]; + out_table[stringlet_count] = (uint16_t)offset; + stringlet_count++; + offset++; + if (stringlet_len == 0) { + if (offset == data_length) { + break; + } else { + return BROTLI_FALSE; + } + } + if (stringlet_count > 255) return BROTLI_FALSE; + offset += stringlet_len; + if (offset >= data_length) return BROTLI_FALSE; + } + + position += data_length; + *pos = position; + *out_table_size = (uint16_t)stringlet_count; + return BROTLI_TRUE; +} + +static BROTLI_BOOL ParseTransformsList(size_t size, const uint8_t* encoded, + size_t* pos, BrotliTransforms* out, uint16_t* prefix_suffix_table, + size_t* prefix_suffix_count) { + uint32_t i; + BROTLI_BOOL has_params = BROTLI_FALSE; + BROTLI_BOOL prefix_suffix_ok = BROTLI_FALSE; + size_t position = *pos; + size_t stringlet_cnt = 0; + if (position >= size) return BROTLI_FALSE; + + prefix_suffix_ok = ParsePrefixSuffixTable( + size, encoded, &position, out, prefix_suffix_table, &stringlet_cnt); + if (!prefix_suffix_ok) return BROTLI_FALSE; + out->prefix_suffix_map = prefix_suffix_table; + *prefix_suffix_count = stringlet_cnt; + + out->num_transforms = encoded[position++]; + out->transforms = &encoded[position]; + position += (size_t)out->num_transforms * 3; + if (position > size) return BROTLI_FALSE; + /* Check for errors and read extra parameters. */ + for (i = 0; i < out->num_transforms; i++) { + uint8_t prefix_id = BROTLI_TRANSFORM_PREFIX_ID(out, i); + uint8_t type = BROTLI_TRANSFORM_TYPE(out, i); + uint8_t suffix_id = BROTLI_TRANSFORM_SUFFIX_ID(out, i); + if (prefix_id >= stringlet_cnt) return BROTLI_FALSE; + if (type >= BROTLI_NUM_TRANSFORM_TYPES) return BROTLI_FALSE; + if (suffix_id >= stringlet_cnt) return BROTLI_FALSE; + if (type == BROTLI_TRANSFORM_SHIFT_FIRST || + type == BROTLI_TRANSFORM_SHIFT_ALL) { + has_params = BROTLI_TRUE; + } + } + if (has_params) { + out->params = &encoded[position]; + position += (size_t)out->num_transforms * 2; + if (position > size) return BROTLI_FALSE; + for (i = 0; i < out->num_transforms; i++) { + uint8_t type = BROTLI_TRANSFORM_TYPE(out, i); + if (type != BROTLI_TRANSFORM_SHIFT_FIRST && + type != BROTLI_TRANSFORM_SHIFT_ALL) { + if (out->params[i * 2] != 0 || out->params[i * 2 + 1] != 0) { + return BROTLI_FALSE; + } + } + } + } else { + out->params = NULL; + } + ComputeCutoffTransforms(out); + *pos = position; + return BROTLI_TRUE; +} + +static BROTLI_BOOL DryParseDictionary(const uint8_t* encoded, + size_t size, uint32_t* num_prefix, BROTLI_BOOL* is_custom_static_dict) { + size_t pos = 0; + uint32_t chunk_size = 0; + uint8_t num_word_lists; + uint8_t num_transform_lists; + *is_custom_static_dict = BROTLI_FALSE; + *num_prefix = 0; + + /* Skip magic header bytes. */ + pos += 2; + + /* LZ77_DICTIONARY_LENGTH */ + if (!ReadVarint32(encoded, size, &pos, &chunk_size)) return BROTLI_FALSE; + if (chunk_size != 0) { + /* This limitation is not specified but the 32-bit Brotli decoder for now */ + if (chunk_size > 1073741823) return BROTLI_FALSE; + *num_prefix = 1; + if (pos + chunk_size > size) return BROTLI_FALSE; + pos += chunk_size; + } + + if (!ReadUint8(encoded, size, &pos, &num_word_lists)) { + return BROTLI_FALSE; + } + if (!ReadUint8(encoded, size, &pos, &num_transform_lists)) { + return BROTLI_FALSE; + } + + if (num_word_lists > 0 || num_transform_lists > 0) { + *is_custom_static_dict = BROTLI_TRUE; + } + + return BROTLI_TRUE; +} + +static BROTLI_BOOL ParseDictionary(const uint8_t* encoded, size_t size, + BrotliSharedDictionary* dict) { + uint32_t i; + size_t pos = 0; + uint32_t chunk_size = 0; + size_t total_prefix_suffix_count = 0; + size_t trasform_list_start[SHARED_BROTLI_NUM_DICTIONARY_CONTEXTS]; + uint16_t temporary_prefix_suffix_table[256]; + + /* Skip magic header bytes. */ + pos += 2; + + /* LZ77_DICTIONARY_LENGTH */ + if (!ReadVarint32(encoded, size, &pos, &chunk_size)) return BROTLI_FALSE; + if (chunk_size != 0) { + if (pos + chunk_size > size) return BROTLI_FALSE; + dict->prefix_size[dict->num_prefix] = chunk_size; + dict->prefix[dict->num_prefix] = &encoded[pos]; + dict->num_prefix++; + /* LZ77_DICTIONARY_LENGTH bytes. */ + pos += chunk_size; + } + + /* NUM_WORD_LISTS */ + if (!ReadUint8(encoded, size, &pos, &dict->num_word_lists)) { + return BROTLI_FALSE; + } + if (dict->num_word_lists > SHARED_BROTLI_NUM_DICTIONARY_CONTEXTS) { + return BROTLI_FALSE; + } + + if (dict->num_word_lists != 0) { + dict->words_instances = (BrotliDictionary*)dict->alloc_func( + dict->memory_manager_opaque, + dict->num_word_lists * sizeof(*dict->words_instances)); + if (!dict->words_instances) return BROTLI_FALSE; /* OOM */ + } + for (i = 0; i < dict->num_word_lists; i++) { + if (!ParseWordList(size, encoded, &pos, &dict->words_instances[i])) { + return BROTLI_FALSE; + } + } + + /* NUM_TRANSFORM_LISTS */ + if (!ReadUint8(encoded, size, &pos, &dict->num_transform_lists)) { + return BROTLI_FALSE; + } + if (dict->num_transform_lists > SHARED_BROTLI_NUM_DICTIONARY_CONTEXTS) { + return BROTLI_FALSE; + } + + if (dict->num_transform_lists != 0) { + dict->transforms_instances = (BrotliTransforms*)dict->alloc_func( + dict->memory_manager_opaque, + dict->num_transform_lists * sizeof(*dict->transforms_instances)); + if (!dict->transforms_instances) return BROTLI_FALSE; /* OOM */ + } + for (i = 0; i < dict->num_transform_lists; i++) { + BROTLI_BOOL ok = BROTLI_FALSE; + size_t prefix_suffix_count = 0; + trasform_list_start[i] = pos; + dict->transforms_instances[i].prefix_suffix_map = + temporary_prefix_suffix_table; + ok = ParseTransformsList( + size, encoded, &pos, &dict->transforms_instances[i], + temporary_prefix_suffix_table, &prefix_suffix_count); + if (!ok) return BROTLI_FALSE; + total_prefix_suffix_count += prefix_suffix_count; + } + if (total_prefix_suffix_count != 0) { + dict->prefix_suffix_maps = (uint16_t*)dict->alloc_func( + dict->memory_manager_opaque, + total_prefix_suffix_count * sizeof(*dict->prefix_suffix_maps)); + if (!dict->prefix_suffix_maps) return BROTLI_FALSE; /* OOM */ + } + total_prefix_suffix_count = 0; + for (i = 0; i < dict->num_transform_lists; i++) { + size_t prefix_suffix_count = 0; + size_t position = trasform_list_start[i]; + uint16_t* prefix_suffix_map = + &dict->prefix_suffix_maps[total_prefix_suffix_count]; + BROTLI_BOOL ok = ParsePrefixSuffixTable( + size, encoded, &position, &dict->transforms_instances[i], + prefix_suffix_map, &prefix_suffix_count); + if (!ok) return BROTLI_FALSE; + dict->transforms_instances[i].prefix_suffix_map = prefix_suffix_map; + total_prefix_suffix_count += prefix_suffix_count; + } + + if (dict->num_word_lists != 0 || dict->num_transform_lists != 0) { + if (!ReadUint8(encoded, size, &pos, &dict->num_dictionaries)) { + return BROTLI_FALSE; + } + if (dict->num_dictionaries == 0 || + dict->num_dictionaries > SHARED_BROTLI_NUM_DICTIONARY_CONTEXTS) { + return BROTLI_FALSE; + } + for (i = 0; i < dict->num_dictionaries; i++) { + uint8_t words_index; + uint8_t transforms_index; + if (!ReadUint8(encoded, size, &pos, &words_index)) { + return BROTLI_FALSE; + } + if (words_index > dict->num_word_lists) return BROTLI_FALSE; + if (!ReadUint8(encoded, size, &pos, &transforms_index)) { + return BROTLI_FALSE; + } + if (transforms_index > dict->num_transform_lists) return BROTLI_FALSE; + dict->words[i] = words_index == dict->num_word_lists ? + BrotliGetDictionary() : &dict->words_instances[words_index]; + dict->transforms[i] = transforms_index == dict->num_transform_lists ? + BrotliGetTransforms(): &dict->transforms_instances[transforms_index]; + } + /* CONTEXT_ENABLED */ + if (!ReadBool(encoded, size, &pos, &dict->context_based)) { + return BROTLI_FALSE; + } + + /* CONTEXT_MAP */ + if (dict->context_based) { + for (i = 0; i < SHARED_BROTLI_NUM_DICTIONARY_CONTEXTS; i++) { + if (!ReadUint8(encoded, size, &pos, &dict->context_map[i])) { + return BROTLI_FALSE; + } + if (dict->context_map[i] >= dict->num_dictionaries) { + return BROTLI_FALSE; + } + } + } + } else { + dict->context_based = BROTLI_FALSE; + dict->num_dictionaries = 1; + dict->words[0] = BrotliGetDictionary(); + dict->transforms[0] = BrotliGetTransforms(); + } + + return BROTLI_TRUE; +} + +/* Decodes shared dictionary and verifies correctness. + Returns BROTLI_TRUE if dictionary is valid, BROTLI_FALSE otherwise. + The BrotliSharedDictionary must already have been initialized. If the + BrotliSharedDictionary already contains data, compound dictionaries + will be appended, but an error will be returned if it already has + custom words or transforms. + TODO(lode): link to RFC for shared brotli once published. */ +static BROTLI_BOOL DecodeSharedDictionary( + const uint8_t* encoded, size_t size, BrotliSharedDictionary* dict) { + uint32_t num_prefix = 0; + BROTLI_BOOL is_custom_static_dict = BROTLI_FALSE; + BROTLI_BOOL has_custom_static_dict = + dict->num_word_lists > 0 || dict->num_transform_lists > 0; + + /* Check magic header bytes. */ + if (size < 2) return BROTLI_FALSE; + if (encoded[0] != 0x91 || encoded[1] != 0) return BROTLI_FALSE; + + if (!DryParseDictionary(encoded, size, &num_prefix, &is_custom_static_dict)) { + return BROTLI_FALSE; + } + + if (num_prefix + dict->num_prefix > SHARED_BROTLI_MAX_COMPOUND_DICTS) { + return BROTLI_FALSE; + } + + /* Cannot combine different static dictionaries, only prefix dictionaries */ + if (has_custom_static_dict && is_custom_static_dict) return BROTLI_FALSE; + + return ParseDictionary(encoded, size, dict); +} + +#endif /* BROTLI_EXPERIMENTAL */ + +void BrotliSharedDictionaryDestroyInstance( + BrotliSharedDictionary* dict) { + if (!dict) { + return; + } else { + brotli_free_func free_func = dict->free_func; + void* opaque = dict->memory_manager_opaque; + /* Cleanup. */ + free_func(opaque, dict->words_instances); + free_func(opaque, dict->transforms_instances); + free_func(opaque, dict->prefix_suffix_maps); + /* Self-destruction. */ + free_func(opaque, dict); + } +} + +BROTLI_BOOL BrotliSharedDictionaryAttach( + BrotliSharedDictionary* dict, BrotliSharedDictionaryType type, + size_t data_size, const uint8_t data[BROTLI_ARRAY_PARAM(data_size)]) { + if (!dict) { + return BROTLI_FALSE; + } +#if defined(BROTLI_EXPERIMENTAL) + if (type == BROTLI_SHARED_DICTIONARY_SERIALIZED) { + return DecodeSharedDictionary(data, data_size, dict); + } +#endif /* BROTLI_EXPERIMENTAL */ + if (type == BROTLI_SHARED_DICTIONARY_RAW) { + if (dict->num_prefix >= SHARED_BROTLI_MAX_COMPOUND_DICTS) { + return BROTLI_FALSE; + } + dict->prefix_size[dict->num_prefix] = data_size; + dict->prefix[dict->num_prefix] = data; + dict->num_prefix++; + return BROTLI_TRUE; + } + return BROTLI_FALSE; +} + +BrotliSharedDictionary* BrotliSharedDictionaryCreateInstance( + brotli_alloc_func alloc_func, brotli_free_func free_func, void* opaque) { + BrotliSharedDictionary* dict = 0; + if (!alloc_func && !free_func) { + dict = (BrotliSharedDictionary*)malloc(sizeof(BrotliSharedDictionary)); + } else if (alloc_func && free_func) { + dict = (BrotliSharedDictionary*)alloc_func( + opaque, sizeof(BrotliSharedDictionary)); + } + if (dict == 0) { + return 0; + } + + /* TODO(eustas): explicitly initialize all the fields? */ + memset(dict, 0, sizeof(BrotliSharedDictionary)); + + dict->context_based = BROTLI_FALSE; + dict->num_dictionaries = 1; + dict->num_word_lists = 0; + dict->num_transform_lists = 0; + + dict->words[0] = BrotliGetDictionary(); + dict->transforms[0] = BrotliGetTransforms(); + + dict->alloc_func = alloc_func ? alloc_func : BrotliDefaultAllocFunc; + dict->free_func = free_func ? free_func : BrotliDefaultFreeFunc; + dict->memory_manager_opaque = opaque; + + return dict; +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif diff --git a/modules/brotli/common/shared_dictionary_internal.h b/modules/brotli/common/shared_dictionary_internal.h new file mode 100644 index 0000000000..963762e432 --- /dev/null +++ b/modules/brotli/common/shared_dictionary_internal.h @@ -0,0 +1,75 @@ +/* Copyright 2017 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* (Transparent) Shared Dictionary definition. */ + +#ifndef BROTLI_COMMON_SHARED_DICTIONARY_INTERNAL_H_ +#define BROTLI_COMMON_SHARED_DICTIONARY_INTERNAL_H_ + +#include <brotli/shared_dictionary.h> +#include <brotli/types.h> + +#include "dictionary.h" +#include "transform.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +struct BrotliSharedDictionaryStruct { + /* LZ77 prefixes (compound dictionary). */ + uint32_t num_prefix; /* max SHARED_BROTLI_MAX_COMPOUND_DICTS */ + size_t prefix_size[SHARED_BROTLI_MAX_COMPOUND_DICTS]; + const uint8_t* prefix[SHARED_BROTLI_MAX_COMPOUND_DICTS]; + + /* If set, the context map is used to select word and transform list from 64 + contexts, if not set, the context map is not used and only words[0] and + transforms[0] are to be used. */ + BROTLI_BOOL context_based; + + uint8_t context_map[SHARED_BROTLI_NUM_DICTIONARY_CONTEXTS]; + + /* Amount of word_list+transform_list combinations. */ + uint8_t num_dictionaries; + + /* Must use num_dictionaries values. */ + const BrotliDictionary* words[SHARED_BROTLI_NUM_DICTIONARY_CONTEXTS]; + + /* Must use num_dictionaries values. */ + const BrotliTransforms* transforms[SHARED_BROTLI_NUM_DICTIONARY_CONTEXTS]; + + /* Amount of custom word lists. May be 0 if only Brotli's built-in is used */ + uint8_t num_word_lists; + + /* Contents of the custom words lists. Must be NULL if num_word_lists is 0. */ + BrotliDictionary* words_instances; + + /* Amount of custom transform lists. May be 0 if only Brotli's built-in is + used */ + uint8_t num_transform_lists; + + /* Contents of the custom transform lists. Must be NULL if num_transform_lists + is 0. */ + BrotliTransforms* transforms_instances; + + /* Concatenated prefix_suffix_maps of the custom transform lists. Must be NULL + if num_transform_lists is 0. */ + uint16_t* prefix_suffix_maps; + + /* Memory management */ + brotli_alloc_func alloc_func; + brotli_free_func free_func; + void* memory_manager_opaque; +}; + +typedef struct BrotliSharedDictionaryStruct BrotliSharedDictionaryInternal; +#define BrotliSharedDictionary BrotliSharedDictionaryInternal + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_COMMON_SHARED_DICTIONARY_INTERNAL_H_ */ diff --git a/modules/brotli/common/transform.c b/modules/brotli/common/transform.c new file mode 100644 index 0000000000..49455fc496 --- /dev/null +++ b/modules/brotli/common/transform.c @@ -0,0 +1,291 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +#include "transform.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +/* RFC 7932 transforms string data */ +static const char kPrefixSuffix[217] = + "\1 \2, \10 of the \4 of \2s \1.\5 and \4 " +/* 0x _0 _2 __5 _E _3 _6 _8 _E */ + "in \1\"\4 to \2\">\1\n\2. \1]\5 for \3 a \6 " +/* 2x _3_ _5 _A_ _D_ _F _2 _4 _A _E */ + "that \1\'\6 with \6 from \4 by \1(\6. T" +/* 4x _5_ _7 _E _5 _A _C */ + "he \4 on \4 as \4 is \4ing \2\n\t\1:\3ed " +/* 6x _3 _8 _D _2 _7_ _ _A _C */ + "\2=\"\4 at \3ly \1,\2=\'\5.com/\7. This \5" +/* 8x _0 _ _3 _8 _C _E _ _1 _7 _F */ + " not \3er \3al \4ful \4ive \5less \4es" +/* Ax _5 _9 _D _2 _7 _D */ + "t \4ize \2\xc2\xa0\4ous \5 the \2e "; /* \0 - implicit trailing zero. */ +/* Cx _2 _7___ ___ _A _F _5 _8 */ + +static const uint16_t kPrefixSuffixMap[50] = { + 0x00, 0x02, 0x05, 0x0E, 0x13, 0x16, 0x18, 0x1E, 0x23, 0x25, + 0x2A, 0x2D, 0x2F, 0x32, 0x34, 0x3A, 0x3E, 0x45, 0x47, 0x4E, + 0x55, 0x5A, 0x5C, 0x63, 0x68, 0x6D, 0x72, 0x77, 0x7A, 0x7C, + 0x80, 0x83, 0x88, 0x8C, 0x8E, 0x91, 0x97, 0x9F, 0xA5, 0xA9, + 0xAD, 0xB2, 0xB7, 0xBD, 0xC2, 0xC7, 0xCA, 0xCF, 0xD5, 0xD8 +}; + +/* RFC 7932 transforms */ +static const uint8_t kTransformsData[] = { + 49, BROTLI_TRANSFORM_IDENTITY, 49, + 49, BROTLI_TRANSFORM_IDENTITY, 0, + 0, BROTLI_TRANSFORM_IDENTITY, 0, + 49, BROTLI_TRANSFORM_OMIT_FIRST_1, 49, + 49, BROTLI_TRANSFORM_UPPERCASE_FIRST, 0, + 49, BROTLI_TRANSFORM_IDENTITY, 47, + 0, BROTLI_TRANSFORM_IDENTITY, 49, + 4, BROTLI_TRANSFORM_IDENTITY, 0, + 49, BROTLI_TRANSFORM_IDENTITY, 3, + 49, BROTLI_TRANSFORM_UPPERCASE_FIRST, 49, + 49, BROTLI_TRANSFORM_IDENTITY, 6, + 49, BROTLI_TRANSFORM_OMIT_FIRST_2, 49, + 49, BROTLI_TRANSFORM_OMIT_LAST_1, 49, + 1, BROTLI_TRANSFORM_IDENTITY, 0, + 49, BROTLI_TRANSFORM_IDENTITY, 1, + 0, BROTLI_TRANSFORM_UPPERCASE_FIRST, 0, + 49, BROTLI_TRANSFORM_IDENTITY, 7, + 49, BROTLI_TRANSFORM_IDENTITY, 9, + 48, BROTLI_TRANSFORM_IDENTITY, 0, + 49, BROTLI_TRANSFORM_IDENTITY, 8, + 49, BROTLI_TRANSFORM_IDENTITY, 5, + 49, BROTLI_TRANSFORM_IDENTITY, 10, + 49, BROTLI_TRANSFORM_IDENTITY, 11, + 49, BROTLI_TRANSFORM_OMIT_LAST_3, 49, + 49, BROTLI_TRANSFORM_IDENTITY, 13, + 49, BROTLI_TRANSFORM_IDENTITY, 14, + 49, BROTLI_TRANSFORM_OMIT_FIRST_3, 49, + 49, BROTLI_TRANSFORM_OMIT_LAST_2, 49, + 49, BROTLI_TRANSFORM_IDENTITY, 15, + 49, BROTLI_TRANSFORM_IDENTITY, 16, + 0, BROTLI_TRANSFORM_UPPERCASE_FIRST, 49, + 49, BROTLI_TRANSFORM_IDENTITY, 12, + 5, BROTLI_TRANSFORM_IDENTITY, 49, + 0, BROTLI_TRANSFORM_IDENTITY, 1, + 49, BROTLI_TRANSFORM_OMIT_FIRST_4, 49, + 49, BROTLI_TRANSFORM_IDENTITY, 18, + 49, BROTLI_TRANSFORM_IDENTITY, 17, + 49, BROTLI_TRANSFORM_IDENTITY, 19, + 49, BROTLI_TRANSFORM_IDENTITY, 20, + 49, BROTLI_TRANSFORM_OMIT_FIRST_5, 49, + 49, BROTLI_TRANSFORM_OMIT_FIRST_6, 49, + 47, BROTLI_TRANSFORM_IDENTITY, 49, + 49, BROTLI_TRANSFORM_OMIT_LAST_4, 49, + 49, BROTLI_TRANSFORM_IDENTITY, 22, + 49, BROTLI_TRANSFORM_UPPERCASE_ALL, 49, + 49, BROTLI_TRANSFORM_IDENTITY, 23, + 49, BROTLI_TRANSFORM_IDENTITY, 24, + 49, BROTLI_TRANSFORM_IDENTITY, 25, + 49, BROTLI_TRANSFORM_OMIT_LAST_7, 49, + 49, BROTLI_TRANSFORM_OMIT_LAST_1, 26, + 49, BROTLI_TRANSFORM_IDENTITY, 27, + 49, BROTLI_TRANSFORM_IDENTITY, 28, + 0, BROTLI_TRANSFORM_IDENTITY, 12, + 49, BROTLI_TRANSFORM_IDENTITY, 29, + 49, BROTLI_TRANSFORM_OMIT_FIRST_9, 49, + 49, BROTLI_TRANSFORM_OMIT_FIRST_7, 49, + 49, BROTLI_TRANSFORM_OMIT_LAST_6, 49, + 49, BROTLI_TRANSFORM_IDENTITY, 21, + 49, BROTLI_TRANSFORM_UPPERCASE_FIRST, 1, + 49, BROTLI_TRANSFORM_OMIT_LAST_8, 49, + 49, BROTLI_TRANSFORM_IDENTITY, 31, + 49, BROTLI_TRANSFORM_IDENTITY, 32, + 47, BROTLI_TRANSFORM_IDENTITY, 3, + 49, BROTLI_TRANSFORM_OMIT_LAST_5, 49, + 49, BROTLI_TRANSFORM_OMIT_LAST_9, 49, + 0, BROTLI_TRANSFORM_UPPERCASE_FIRST, 1, + 49, BROTLI_TRANSFORM_UPPERCASE_FIRST, 8, + 5, BROTLI_TRANSFORM_IDENTITY, 21, + 49, BROTLI_TRANSFORM_UPPERCASE_ALL, 0, + 49, BROTLI_TRANSFORM_UPPERCASE_FIRST, 10, + 49, BROTLI_TRANSFORM_IDENTITY, 30, + 0, BROTLI_TRANSFORM_IDENTITY, 5, + 35, BROTLI_TRANSFORM_IDENTITY, 49, + 47, BROTLI_TRANSFORM_IDENTITY, 2, + 49, BROTLI_TRANSFORM_UPPERCASE_FIRST, 17, + 49, BROTLI_TRANSFORM_IDENTITY, 36, + 49, BROTLI_TRANSFORM_IDENTITY, 33, + 5, BROTLI_TRANSFORM_IDENTITY, 0, + 49, BROTLI_TRANSFORM_UPPERCASE_FIRST, 21, + 49, BROTLI_TRANSFORM_UPPERCASE_FIRST, 5, + 49, BROTLI_TRANSFORM_IDENTITY, 37, + 0, BROTLI_TRANSFORM_IDENTITY, 30, + 49, BROTLI_TRANSFORM_IDENTITY, 38, + 0, BROTLI_TRANSFORM_UPPERCASE_ALL, 0, + 49, BROTLI_TRANSFORM_IDENTITY, 39, + 0, BROTLI_TRANSFORM_UPPERCASE_ALL, 49, + 49, BROTLI_TRANSFORM_IDENTITY, 34, + 49, BROTLI_TRANSFORM_UPPERCASE_ALL, 8, + 49, BROTLI_TRANSFORM_UPPERCASE_FIRST, 12, + 0, BROTLI_TRANSFORM_IDENTITY, 21, + 49, BROTLI_TRANSFORM_IDENTITY, 40, + 0, BROTLI_TRANSFORM_UPPERCASE_FIRST, 12, + 49, BROTLI_TRANSFORM_IDENTITY, 41, + 49, BROTLI_TRANSFORM_IDENTITY, 42, + 49, BROTLI_TRANSFORM_UPPERCASE_ALL, 17, + 49, BROTLI_TRANSFORM_IDENTITY, 43, + 0, BROTLI_TRANSFORM_UPPERCASE_FIRST, 5, + 49, BROTLI_TRANSFORM_UPPERCASE_ALL, 10, + 0, BROTLI_TRANSFORM_IDENTITY, 34, + 49, BROTLI_TRANSFORM_UPPERCASE_FIRST, 33, + 49, BROTLI_TRANSFORM_IDENTITY, 44, + 49, BROTLI_TRANSFORM_UPPERCASE_ALL, 5, + 45, BROTLI_TRANSFORM_IDENTITY, 49, + 0, BROTLI_TRANSFORM_IDENTITY, 33, + 49, BROTLI_TRANSFORM_UPPERCASE_FIRST, 30, + 49, BROTLI_TRANSFORM_UPPERCASE_ALL, 30, + 49, BROTLI_TRANSFORM_IDENTITY, 46, + 49, BROTLI_TRANSFORM_UPPERCASE_ALL, 1, + 49, BROTLI_TRANSFORM_UPPERCASE_FIRST, 34, + 0, BROTLI_TRANSFORM_UPPERCASE_FIRST, 33, + 0, BROTLI_TRANSFORM_UPPERCASE_ALL, 30, + 0, BROTLI_TRANSFORM_UPPERCASE_ALL, 1, + 49, BROTLI_TRANSFORM_UPPERCASE_ALL, 33, + 49, BROTLI_TRANSFORM_UPPERCASE_ALL, 21, + 49, BROTLI_TRANSFORM_UPPERCASE_ALL, 12, + 0, BROTLI_TRANSFORM_UPPERCASE_ALL, 5, + 49, BROTLI_TRANSFORM_UPPERCASE_ALL, 34, + 0, BROTLI_TRANSFORM_UPPERCASE_ALL, 12, + 0, BROTLI_TRANSFORM_UPPERCASE_FIRST, 30, + 0, BROTLI_TRANSFORM_UPPERCASE_ALL, 34, + 0, BROTLI_TRANSFORM_UPPERCASE_FIRST, 34, +}; + +static const BrotliTransforms kBrotliTransforms = { + sizeof(kPrefixSuffix), + (const uint8_t*)kPrefixSuffix, + kPrefixSuffixMap, + sizeof(kTransformsData) / (3 * sizeof(kTransformsData[0])), + kTransformsData, + NULL, /* no extra parameters */ + {0, 12, 27, 23, 42, 63, 56, 48, 59, 64} +}; + +const BrotliTransforms* BrotliGetTransforms(void) { + return &kBrotliTransforms; +} + +static int ToUpperCase(uint8_t* p) { + if (p[0] < 0xC0) { + if (p[0] >= 'a' && p[0] <= 'z') { + p[0] ^= 32; + } + return 1; + } + /* An overly simplified uppercasing model for UTF-8. */ + if (p[0] < 0xE0) { + p[1] ^= 32; + return 2; + } + /* An arbitrary transform for three byte characters. */ + p[2] ^= 5; + return 3; +} + +static int Shift(uint8_t* word, int word_len, uint16_t parameter) { + /* Limited sign extension: scalar < (1 << 24). */ + uint32_t scalar = + (parameter & 0x7FFFu) + (0x1000000u - (parameter & 0x8000u)); + if (word[0] < 0x80) { + /* 1-byte rune / 0sssssss / 7 bit scalar (ASCII). */ + scalar += (uint32_t)word[0]; + word[0] = (uint8_t)(scalar & 0x7Fu); + return 1; + } else if (word[0] < 0xC0) { + /* Continuation / 10AAAAAA. */ + return 1; + } else if (word[0] < 0xE0) { + /* 2-byte rune / 110sssss AAssssss / 11 bit scalar. */ + if (word_len < 2) return 1; + scalar += (uint32_t)((word[1] & 0x3Fu) | ((word[0] & 0x1Fu) << 6u)); + word[0] = (uint8_t)(0xC0 | ((scalar >> 6u) & 0x1F)); + word[1] = (uint8_t)((word[1] & 0xC0) | (scalar & 0x3F)); + return 2; + } else if (word[0] < 0xF0) { + /* 3-byte rune / 1110ssss AAssssss BBssssss / 16 bit scalar. */ + if (word_len < 3) return word_len; + scalar += (uint32_t)((word[2] & 0x3Fu) | ((word[1] & 0x3Fu) << 6u) | + ((word[0] & 0x0Fu) << 12u)); + word[0] = (uint8_t)(0xE0 | ((scalar >> 12u) & 0x0F)); + word[1] = (uint8_t)((word[1] & 0xC0) | ((scalar >> 6u) & 0x3F)); + word[2] = (uint8_t)((word[2] & 0xC0) | (scalar & 0x3F)); + return 3; + } else if (word[0] < 0xF8) { + /* 4-byte rune / 11110sss AAssssss BBssssss CCssssss / 21 bit scalar. */ + if (word_len < 4) return word_len; + scalar += (uint32_t)((word[3] & 0x3Fu) | ((word[2] & 0x3Fu) << 6u) | + ((word[1] & 0x3Fu) << 12u) | ((word[0] & 0x07u) << 18u)); + word[0] = (uint8_t)(0xF0 | ((scalar >> 18u) & 0x07)); + word[1] = (uint8_t)((word[1] & 0xC0) | ((scalar >> 12u) & 0x3F)); + word[2] = (uint8_t)((word[2] & 0xC0) | ((scalar >> 6u) & 0x3F)); + word[3] = (uint8_t)((word[3] & 0xC0) | (scalar & 0x3F)); + return 4; + } + return 1; +} + +int BrotliTransformDictionaryWord(uint8_t* dst, const uint8_t* word, int len, + const BrotliTransforms* transforms, int transform_idx) { + int idx = 0; + const uint8_t* prefix = BROTLI_TRANSFORM_PREFIX(transforms, transform_idx); + uint8_t type = BROTLI_TRANSFORM_TYPE(transforms, transform_idx); + const uint8_t* suffix = BROTLI_TRANSFORM_SUFFIX(transforms, transform_idx); + { + int prefix_len = *prefix++; + while (prefix_len--) { dst[idx++] = *prefix++; } + } + { + const int t = type; + int i = 0; + if (t <= BROTLI_TRANSFORM_OMIT_LAST_9) { + len -= t; + } else if (t >= BROTLI_TRANSFORM_OMIT_FIRST_1 + && t <= BROTLI_TRANSFORM_OMIT_FIRST_9) { + int skip = t - (BROTLI_TRANSFORM_OMIT_FIRST_1 - 1); + word += skip; + len -= skip; + } + while (i < len) { dst[idx++] = word[i++]; } + if (t == BROTLI_TRANSFORM_UPPERCASE_FIRST) { + ToUpperCase(&dst[idx - len]); + } else if (t == BROTLI_TRANSFORM_UPPERCASE_ALL) { + uint8_t* uppercase = &dst[idx - len]; + while (len > 0) { + int step = ToUpperCase(uppercase); + uppercase += step; + len -= step; + } + } else if (t == BROTLI_TRANSFORM_SHIFT_FIRST) { + uint16_t param = (uint16_t)(transforms->params[transform_idx * 2] + + (transforms->params[transform_idx * 2 + 1] << 8u)); + Shift(&dst[idx - len], len, param); + } else if (t == BROTLI_TRANSFORM_SHIFT_ALL) { + uint16_t param = (uint16_t)(transforms->params[transform_idx * 2] + + (transforms->params[transform_idx * 2 + 1] << 8u)); + uint8_t* shift = &dst[idx - len]; + while (len > 0) { + int step = Shift(shift, len, param); + shift += step; + len -= step; + } + } + } + { + int suffix_len = *suffix++; + while (suffix_len--) { dst[idx++] = *suffix++; } + return idx; + } +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif diff --git a/modules/brotli/common/transform.h b/modules/brotli/common/transform.h new file mode 100644 index 0000000000..b6f86cc7d5 --- /dev/null +++ b/modules/brotli/common/transform.h @@ -0,0 +1,85 @@ +/* transforms is a part of ABI, but not API. + + It means that there are some functions that are supposed to be in "common" + library, but header itself is not placed into include/brotli. This way, + aforementioned functions will be available only to brotli internals. + */ + +#ifndef BROTLI_COMMON_TRANSFORM_H_ +#define BROTLI_COMMON_TRANSFORM_H_ + +#include <brotli/port.h> +#include <brotli/types.h> + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +enum BrotliWordTransformType { + BROTLI_TRANSFORM_IDENTITY = 0, + BROTLI_TRANSFORM_OMIT_LAST_1 = 1, + BROTLI_TRANSFORM_OMIT_LAST_2 = 2, + BROTLI_TRANSFORM_OMIT_LAST_3 = 3, + BROTLI_TRANSFORM_OMIT_LAST_4 = 4, + BROTLI_TRANSFORM_OMIT_LAST_5 = 5, + BROTLI_TRANSFORM_OMIT_LAST_6 = 6, + BROTLI_TRANSFORM_OMIT_LAST_7 = 7, + BROTLI_TRANSFORM_OMIT_LAST_8 = 8, + BROTLI_TRANSFORM_OMIT_LAST_9 = 9, + BROTLI_TRANSFORM_UPPERCASE_FIRST = 10, + BROTLI_TRANSFORM_UPPERCASE_ALL = 11, + BROTLI_TRANSFORM_OMIT_FIRST_1 = 12, + BROTLI_TRANSFORM_OMIT_FIRST_2 = 13, + BROTLI_TRANSFORM_OMIT_FIRST_3 = 14, + BROTLI_TRANSFORM_OMIT_FIRST_4 = 15, + BROTLI_TRANSFORM_OMIT_FIRST_5 = 16, + BROTLI_TRANSFORM_OMIT_FIRST_6 = 17, + BROTLI_TRANSFORM_OMIT_FIRST_7 = 18, + BROTLI_TRANSFORM_OMIT_FIRST_8 = 19, + BROTLI_TRANSFORM_OMIT_FIRST_9 = 20, + BROTLI_TRANSFORM_SHIFT_FIRST = 21, + BROTLI_TRANSFORM_SHIFT_ALL = 22, + BROTLI_NUM_TRANSFORM_TYPES /* Counts transforms, not a transform itself. */ +}; + +#define BROTLI_TRANSFORMS_MAX_CUT_OFF BROTLI_TRANSFORM_OMIT_LAST_9 + +typedef struct BrotliTransforms { + uint16_t prefix_suffix_size; + /* Last character must be null, so prefix_suffix_size must be at least 1. */ + const uint8_t* prefix_suffix; + const uint16_t* prefix_suffix_map; + uint32_t num_transforms; + /* Each entry is a [prefix_id, transform, suffix_id] triplet. */ + const uint8_t* transforms; + /* Shift for BROTLI_TRANSFORM_SHIFT_FIRST and BROTLI_TRANSFORM_SHIFT_ALL, + must be NULL if and only if no such transforms are present. */ + const uint8_t* params; + /* Indices of transforms like ["", BROTLI_TRANSFORM_OMIT_LAST_#, ""]. + 0-th element corresponds to ["", BROTLI_TRANSFORM_IDENTITY, ""]. + -1, if cut-off transform does not exist. */ + int16_t cutOffTransforms[BROTLI_TRANSFORMS_MAX_CUT_OFF + 1]; +} BrotliTransforms; + +/* T is BrotliTransforms*; result is uint8_t. */ +#define BROTLI_TRANSFORM_PREFIX_ID(T, I) ((T)->transforms[((I) * 3) + 0]) +#define BROTLI_TRANSFORM_TYPE(T, I) ((T)->transforms[((I) * 3) + 1]) +#define BROTLI_TRANSFORM_SUFFIX_ID(T, I) ((T)->transforms[((I) * 3) + 2]) + +/* T is BrotliTransforms*; result is const uint8_t*. */ +#define BROTLI_TRANSFORM_PREFIX(T, I) (&(T)->prefix_suffix[ \ + (T)->prefix_suffix_map[BROTLI_TRANSFORM_PREFIX_ID(T, I)]]) +#define BROTLI_TRANSFORM_SUFFIX(T, I) (&(T)->prefix_suffix[ \ + (T)->prefix_suffix_map[BROTLI_TRANSFORM_SUFFIX_ID(T, I)]]) + +BROTLI_COMMON_API const BrotliTransforms* BrotliGetTransforms(void); + +BROTLI_COMMON_API int BrotliTransformDictionaryWord( + uint8_t* dst, const uint8_t* word, int len, + const BrotliTransforms* transforms, int transform_idx); + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_COMMON_TRANSFORM_H_ */ diff --git a/modules/brotli/common/version.h b/modules/brotli/common/version.h new file mode 100644 index 0000000000..8098040f64 --- /dev/null +++ b/modules/brotli/common/version.h @@ -0,0 +1,51 @@ +/* Copyright 2016 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Version definition. */ + +#ifndef BROTLI_COMMON_VERSION_H_ +#define BROTLI_COMMON_VERSION_H_ + +/* Compose 3 components into a single number. In a hexadecimal representation + B and C components occupy exactly 3 digits. */ +#define BROTLI_MAKE_HEX_VERSION(A, B, C) ((A << 24) | (B << 12) | C) + +/* Those macros should only be used when library is compiled together with + the client. If library is dynamically linked, use BrotliDecoderVersion and + BrotliEncoderVersion methods. */ + +#define BROTLI_VERSION_MAJOR 1 +#define BROTLI_VERSION_MINOR 1 +#define BROTLI_VERSION_PATCH 0 + +#define BROTLI_VERSION BROTLI_MAKE_HEX_VERSION( \ + BROTLI_VERSION_MAJOR, BROTLI_VERSION_MINOR, BROTLI_VERSION_PATCH) + +/* This macro is used by build system to produce Libtool-friendly soname. See + https://www.gnu.org/software/libtool/manual/html_node/Libtool-versioning.html + Version evolution rules: + - interfaces added (or change is compatible) -> current+1:0:age+1 + - interfaces removed (or changed is incompatible) -> current+1:0:0 + - interfaces not changed -> current:revision+1:age + */ + +#define BROTLI_ABI_CURRENT 2 +#define BROTLI_ABI_REVISION 0 +#define BROTLI_ABI_AGE 1 + +#if BROTLI_VERSION_MAJOR != (BROTLI_ABI_CURRENT - BROTLI_ABI_AGE) +#error ABI/API version inconsistency +#endif + +#if BROTLI_VERSION_MINOR != BROTLI_ABI_AGE +#error ABI/API version inconsistency +#endif + +#if BROTLI_VERSION_PATCH != BROTLI_ABI_REVISION +#error ABI/API version inconsistency +#endif + +#endif /* BROTLI_COMMON_VERSION_H_ */ diff --git a/modules/brotli/dec/bit_reader.c b/modules/brotli/dec/bit_reader.c new file mode 100644 index 0000000000..35101ddc1a --- /dev/null +++ b/modules/brotli/dec/bit_reader.c @@ -0,0 +1,78 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Bit reading helpers */ + +#include "bit_reader.h" + +#include <brotli/types.h> + +#include "../common/platform.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +const brotli_reg_t kBrotliBitMask[33] = { 0x00000000, + 0x00000001, 0x00000003, 0x00000007, 0x0000000F, + 0x0000001F, 0x0000003F, 0x0000007F, 0x000000FF, + 0x000001FF, 0x000003FF, 0x000007FF, 0x00000FFF, + 0x00001FFF, 0x00003FFF, 0x00007FFF, 0x0000FFFF, + 0x0001FFFF, 0x0003FFFF, 0x0007FFFF, 0x000FFFFF, + 0x001FFFFF, 0x003FFFFF, 0x007FFFFF, 0x00FFFFFF, + 0x01FFFFFF, 0x03FFFFFF, 0x07FFFFFF, 0x0FFFFFFF, + 0x1FFFFFFF, 0x3FFFFFFF, 0x7FFFFFFF, 0xFFFFFFFF +}; + +void BrotliInitBitReader(BrotliBitReader* const br) { + br->val_ = 0; + br->bit_pos_ = 0; +} + +BROTLI_BOOL BrotliWarmupBitReader(BrotliBitReader* const br) { + size_t aligned_read_mask = (sizeof(br->val_) >> 1) - 1; + /* Fixing alignment after unaligned BrotliFillWindow would result accumulator + overflow. If unalignment is caused by BrotliSafeReadBits, then there is + enough space in accumulator to fix alignment. */ + if (BROTLI_UNALIGNED_READ_FAST) { + aligned_read_mask = 0; + } + if (BrotliGetAvailableBits(br) == 0) { + br->val_ = 0; + if (!BrotliPullByte(br)) { + return BROTLI_FALSE; + } + } + + while ((((size_t)br->next_in) & aligned_read_mask) != 0) { + if (!BrotliPullByte(br)) { + /* If we consumed all the input, we don't care about the alignment. */ + return BROTLI_TRUE; + } + } + return BROTLI_TRUE; +} + +BROTLI_BOOL BrotliSafeReadBits32Slow(BrotliBitReader* const br, + brotli_reg_t n_bits, brotli_reg_t* val) { + brotli_reg_t low_val; + brotli_reg_t high_val; + BrotliBitReaderState memento; + BROTLI_DCHECK(n_bits <= 32); + BROTLI_DCHECK(n_bits > 24); + BrotliBitReaderSaveState(br, &memento); + if (!BrotliSafeReadBits(br, 16, &low_val) || + !BrotliSafeReadBits(br, n_bits - 16, &high_val)) { + BrotliBitReaderRestoreState(br, &memento); + return BROTLI_FALSE; + } + *val = low_val | (high_val << 16); + return BROTLI_TRUE; +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif diff --git a/modules/brotli/dec/bit_reader.h b/modules/brotli/dec/bit_reader.h new file mode 100644 index 0000000000..930dc60f1d --- /dev/null +++ b/modules/brotli/dec/bit_reader.h @@ -0,0 +1,423 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Bit reading helpers */ + +#ifndef BROTLI_DEC_BIT_READER_H_ +#define BROTLI_DEC_BIT_READER_H_ + +#include <string.h> /* memcpy */ + +#include <brotli/types.h> + +#include "../common/constants.h" +#include "../common/platform.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +#define BROTLI_SHORT_FILL_BIT_WINDOW_READ (sizeof(brotli_reg_t) >> 1) + +/* 162 bits + 7 bytes */ +#define BROTLI_FAST_INPUT_SLACK 28 + +BROTLI_INTERNAL extern const brotli_reg_t kBrotliBitMask[33]; + +static BROTLI_INLINE brotli_reg_t BitMask(brotli_reg_t n) { + if (BROTLI_IS_CONSTANT(n) || BROTLI_HAS_UBFX) { + /* Masking with this expression turns to a single + "Unsigned Bit Field Extract" UBFX instruction on ARM. */ + return ~(~((brotli_reg_t)0) << n); + } else { + return kBrotliBitMask[n]; + } +} + +typedef struct { + brotli_reg_t val_; /* pre-fetched bits */ + brotli_reg_t bit_pos_; /* current bit-reading position in val_ */ + const uint8_t* next_in; /* the byte we're reading from */ + const uint8_t* guard_in; /* position from which "fast-path" is prohibited */ + const uint8_t* last_in; /* == next_in + avail_in */ +} BrotliBitReader; + +typedef struct { + brotli_reg_t val_; + brotli_reg_t bit_pos_; + const uint8_t* next_in; + size_t avail_in; +} BrotliBitReaderState; + +/* Initializes the BrotliBitReader fields. */ +BROTLI_INTERNAL void BrotliInitBitReader(BrotliBitReader* br); + +/* Ensures that accumulator is not empty. + May consume up to sizeof(brotli_reg_t) - 1 bytes of input. + Returns BROTLI_FALSE if data is required but there is no input available. + For !BROTLI_UNALIGNED_READ_FAST this function also prepares bit reader for + aligned reading. */ +BROTLI_INTERNAL BROTLI_BOOL BrotliWarmupBitReader(BrotliBitReader* br); + +/* Fallback for BrotliSafeReadBits32. Extracted as noninlined method to unburden + the main code-path. Never called for RFC brotli streams, required only for + "large-window" mode and other extensions. */ +BROTLI_INTERNAL BROTLI_NOINLINE BROTLI_BOOL BrotliSafeReadBits32Slow( + BrotliBitReader* br, brotli_reg_t n_bits, brotli_reg_t* val); + +static BROTLI_INLINE size_t +BrotliBitReaderGetAvailIn(BrotliBitReader* const br) { + return (size_t)(br->last_in - br->next_in); +} + +static BROTLI_INLINE void BrotliBitReaderSaveState( + BrotliBitReader* const from, BrotliBitReaderState* to) { + to->val_ = from->val_; + to->bit_pos_ = from->bit_pos_; + to->next_in = from->next_in; + to->avail_in = BrotliBitReaderGetAvailIn(from); +} + +static BROTLI_INLINE void BrotliBitReaderSetInput( + BrotliBitReader* const br, const uint8_t* next_in, size_t avail_in) { + br->next_in = next_in; + br->last_in = (avail_in == 0) ? next_in : (next_in + avail_in); + if (avail_in + 1 > BROTLI_FAST_INPUT_SLACK) { + br->guard_in = next_in + (avail_in + 1 - BROTLI_FAST_INPUT_SLACK); + } else { + br->guard_in = next_in; + } +} + +static BROTLI_INLINE void BrotliBitReaderRestoreState( + BrotliBitReader* const to, BrotliBitReaderState* from) { + to->val_ = from->val_; + to->bit_pos_ = from->bit_pos_; + to->next_in = from->next_in; + BrotliBitReaderSetInput(to, from->next_in, from->avail_in); +} + +static BROTLI_INLINE brotli_reg_t BrotliGetAvailableBits( + const BrotliBitReader* br) { + return br->bit_pos_; +} + +/* Returns amount of unread bytes the bit reader still has buffered from the + BrotliInput, including whole bytes in br->val_. Result is capped with + maximal ring-buffer size (larger number won't be utilized anyway). */ +static BROTLI_INLINE size_t BrotliGetRemainingBytes(BrotliBitReader* br) { + static const size_t kCap = (size_t)1 << BROTLI_LARGE_MAX_WBITS; + size_t avail_in = BrotliBitReaderGetAvailIn(br); + if (avail_in > kCap) return kCap; + return avail_in + (BrotliGetAvailableBits(br) >> 3); +} + +/* Checks if there is at least |num| bytes left in the input ring-buffer + (excluding the bits remaining in br->val_). */ +static BROTLI_INLINE BROTLI_BOOL BrotliCheckInputAmount( + BrotliBitReader* const br) { + return TO_BROTLI_BOOL(br->next_in < br->guard_in); +} + +/* Load more bits into accumulator. */ +static BROTLI_INLINE brotli_reg_t BrotliBitReaderLoadBits(brotli_reg_t val, + brotli_reg_t new_bits, + brotli_reg_t count, + brotli_reg_t offset) { + BROTLI_DCHECK( + !((val >> offset) & ~new_bits & ~(~((brotli_reg_t)0) << count))); + (void)count; + return val | (new_bits << offset); +} + +/* Guarantees that there are at least |n_bits| + 1 bits in accumulator. + Precondition: accumulator contains at least 1 bit. + |n_bits| should be in the range [1..24] for regular build. For portable + non-64-bit little-endian build only 16 bits are safe to request. */ +static BROTLI_INLINE void BrotliFillBitWindow( + BrotliBitReader* const br, brotli_reg_t n_bits) { +#if (BROTLI_64_BITS) + if (BROTLI_UNALIGNED_READ_FAST && BROTLI_IS_CONSTANT(n_bits) && + (n_bits <= 8)) { + brotli_reg_t bit_pos = br->bit_pos_; + if (bit_pos <= 8) { + br->val_ = BrotliBitReaderLoadBits(br->val_, + BROTLI_UNALIGNED_LOAD64LE(br->next_in), 56, bit_pos); + br->bit_pos_ = bit_pos + 56; + br->next_in += 7; + } + } else if (BROTLI_UNALIGNED_READ_FAST && BROTLI_IS_CONSTANT(n_bits) && + (n_bits <= 16)) { + brotli_reg_t bit_pos = br->bit_pos_; + if (bit_pos <= 16) { + br->val_ = BrotliBitReaderLoadBits(br->val_, + BROTLI_UNALIGNED_LOAD64LE(br->next_in), 48, bit_pos); + br->bit_pos_ = bit_pos + 48; + br->next_in += 6; + } + } else { + brotli_reg_t bit_pos = br->bit_pos_; + if (bit_pos <= 32) { + br->val_ = BrotliBitReaderLoadBits(br->val_, + (uint64_t)BROTLI_UNALIGNED_LOAD32LE(br->next_in), 32, bit_pos); + br->bit_pos_ = bit_pos + 32; + br->next_in += BROTLI_SHORT_FILL_BIT_WINDOW_READ; + } + } +#else + if (BROTLI_UNALIGNED_READ_FAST && BROTLI_IS_CONSTANT(n_bits) && + (n_bits <= 8)) { + brotli_reg_t bit_pos = br->bit_pos_; + if (bit_pos <= 8) { + br->val_ = BrotliBitReaderLoadBits(br->val_, + BROTLI_UNALIGNED_LOAD32LE(br->next_in), 24, bit_pos); + br->bit_pos_ = bit_pos + 24; + br->next_in += 3; + } + } else { + brotli_reg_t bit_pos = br->bit_pos_; + if (bit_pos <= 16) { + br->val_ = BrotliBitReaderLoadBits(br->val_, + (uint32_t)BROTLI_UNALIGNED_LOAD16LE(br->next_in), 16, bit_pos); + br->bit_pos_ = bit_pos + 16; + br->next_in += BROTLI_SHORT_FILL_BIT_WINDOW_READ; + } + } +#endif +} + +/* Mostly like BrotliFillBitWindow, but guarantees only 16 bits and reads no + more than BROTLI_SHORT_FILL_BIT_WINDOW_READ bytes of input. */ +static BROTLI_INLINE void BrotliFillBitWindow16(BrotliBitReader* const br) { + BrotliFillBitWindow(br, 17); +} + +/* Tries to pull one byte of input to accumulator. + Returns BROTLI_FALSE if there is no input available. */ +static BROTLI_INLINE BROTLI_BOOL BrotliPullByte(BrotliBitReader* const br) { + if (br->next_in == br->last_in) { + return BROTLI_FALSE; + } + br->val_ = BrotliBitReaderLoadBits(br->val_, + (brotli_reg_t)*br->next_in, 8, br->bit_pos_); + br->bit_pos_ += 8; + ++br->next_in; + return BROTLI_TRUE; +} + +/* Returns currently available bits. + The number of valid bits could be calculated by BrotliGetAvailableBits. */ +static BROTLI_INLINE brotli_reg_t BrotliGetBitsUnmasked( + BrotliBitReader* const br) { + return br->val_; +} + +/* Like BrotliGetBits, but does not mask the result. + The result contains at least 16 valid bits. */ +static BROTLI_INLINE brotli_reg_t BrotliGet16BitsUnmasked( + BrotliBitReader* const br) { + BrotliFillBitWindow(br, 16); + return (brotli_reg_t)BrotliGetBitsUnmasked(br); +} + +/* Returns the specified number of bits from |br| without advancing bit + position. */ +static BROTLI_INLINE brotli_reg_t BrotliGetBits( + BrotliBitReader* const br, brotli_reg_t n_bits) { + BrotliFillBitWindow(br, n_bits); + return BrotliGetBitsUnmasked(br) & BitMask(n_bits); +} + +/* Tries to peek the specified amount of bits. Returns BROTLI_FALSE, if there + is not enough input. */ +static BROTLI_INLINE BROTLI_BOOL BrotliSafeGetBits( + BrotliBitReader* const br, brotli_reg_t n_bits, brotli_reg_t* val) { + while (BrotliGetAvailableBits(br) < n_bits) { + if (!BrotliPullByte(br)) { + return BROTLI_FALSE; + } + } + *val = BrotliGetBitsUnmasked(br) & BitMask(n_bits); + return BROTLI_TRUE; +} + +/* Advances the bit pos by |n_bits|. */ +static BROTLI_INLINE void BrotliDropBits( + BrotliBitReader* const br, brotli_reg_t n_bits) { + br->bit_pos_ -= n_bits; + br->val_ >>= n_bits; +} + +/* Make sure that there are no spectre bits in accumulator. + This is important for the cases when some bytes are skipped + (i.e. never placed into accumulator). */ +static BROTLI_INLINE void BrotliBitReaderNormalize(BrotliBitReader* br) { + /* Actually, it is enough to normalize when br->bit_pos_ == 0 */ + if (br->bit_pos_ < (sizeof(brotli_reg_t) << 3u)) { + br->val_ &= (((brotli_reg_t)1) << br->bit_pos_) - 1; + } +} + +static BROTLI_INLINE void BrotliBitReaderUnload(BrotliBitReader* br) { + brotli_reg_t unused_bytes = BrotliGetAvailableBits(br) >> 3; + brotli_reg_t unused_bits = unused_bytes << 3; + br->next_in = + (unused_bytes == 0) ? br->next_in : (br->next_in - unused_bytes); + br->bit_pos_ -= unused_bits; + BrotliBitReaderNormalize(br); +} + +/* Reads the specified number of bits from |br| and advances the bit pos. + Precondition: accumulator MUST contain at least |n_bits|. */ +static BROTLI_INLINE void BrotliTakeBits(BrotliBitReader* const br, + brotli_reg_t n_bits, + brotli_reg_t* val) { + *val = BrotliGetBitsUnmasked(br) & BitMask(n_bits); + BROTLI_LOG(("[BrotliTakeBits] %d %d %d val: %6x\n", + (int)BrotliBitReaderGetAvailIn(br), (int)br->bit_pos_, + (int)n_bits, (int)*val)); + BrotliDropBits(br, n_bits); +} + +/* Reads the specified number of bits from |br| and advances the bit pos. + Assumes that there is enough input to perform BrotliFillBitWindow. + Up to 24 bits are allowed to be requested from this method. */ +static BROTLI_INLINE brotli_reg_t BrotliReadBits24( + BrotliBitReader* const br, brotli_reg_t n_bits) { + BROTLI_DCHECK(n_bits <= 24); + if (BROTLI_64_BITS || (n_bits <= 16)) { + brotli_reg_t val; + BrotliFillBitWindow(br, n_bits); + BrotliTakeBits(br, n_bits, &val); + return val; + } else { + brotli_reg_t low_val; + brotli_reg_t high_val; + BrotliFillBitWindow(br, 16); + BrotliTakeBits(br, 16, &low_val); + BrotliFillBitWindow(br, 8); + BrotliTakeBits(br, n_bits - 16, &high_val); + return low_val | (high_val << 16); + } +} + +/* Same as BrotliReadBits24, but allows reading up to 32 bits. */ +static BROTLI_INLINE brotli_reg_t BrotliReadBits32( + BrotliBitReader* const br, brotli_reg_t n_bits) { + BROTLI_DCHECK(n_bits <= 32); + if (BROTLI_64_BITS || (n_bits <= 16)) { + brotli_reg_t val; + BrotliFillBitWindow(br, n_bits); + BrotliTakeBits(br, n_bits, &val); + return val; + } else { + brotli_reg_t low_val; + brotli_reg_t high_val; + BrotliFillBitWindow(br, 16); + BrotliTakeBits(br, 16, &low_val); + BrotliFillBitWindow(br, 16); + BrotliTakeBits(br, n_bits - 16, &high_val); + return low_val | (high_val << 16); + } +} + +/* Tries to read the specified amount of bits. Returns BROTLI_FALSE, if there + is not enough input. |n_bits| MUST be positive. + Up to 24 bits are allowed to be requested from this method. */ +static BROTLI_INLINE BROTLI_BOOL BrotliSafeReadBits( + BrotliBitReader* const br, brotli_reg_t n_bits, brotli_reg_t* val) { + BROTLI_DCHECK(n_bits <= 24); + while (BrotliGetAvailableBits(br) < n_bits) { + if (!BrotliPullByte(br)) { + return BROTLI_FALSE; + } + } + BrotliTakeBits(br, n_bits, val); + return BROTLI_TRUE; +} + +/* Same as BrotliSafeReadBits, but allows reading up to 32 bits. */ +static BROTLI_INLINE BROTLI_BOOL BrotliSafeReadBits32( + BrotliBitReader* const br, brotli_reg_t n_bits, brotli_reg_t* val) { + BROTLI_DCHECK(n_bits <= 32); + if (BROTLI_64_BITS || (n_bits <= 24)) { + while (BrotliGetAvailableBits(br) < n_bits) { + if (!BrotliPullByte(br)) { + return BROTLI_FALSE; + } + } + BrotliTakeBits(br, n_bits, val); + return BROTLI_TRUE; + } else { + return BrotliSafeReadBits32Slow(br, n_bits, val); + } +} + +/* Advances the bit reader position to the next byte boundary and verifies + that any skipped bits are set to zero. */ +static BROTLI_INLINE BROTLI_BOOL BrotliJumpToByteBoundary(BrotliBitReader* br) { + brotli_reg_t pad_bits_count = BrotliGetAvailableBits(br) & 0x7; + brotli_reg_t pad_bits = 0; + if (pad_bits_count != 0) { + BrotliTakeBits(br, pad_bits_count, &pad_bits); + } + BrotliBitReaderNormalize(br); + return TO_BROTLI_BOOL(pad_bits == 0); +} + +static BROTLI_INLINE void BrotliDropBytes(BrotliBitReader* br, size_t num) { + /* Check detour is legal: accumulator must to be empty. */ + BROTLI_DCHECK(br->bit_pos_ == 0); + BROTLI_DCHECK(br->val_ == 0); + br->next_in += num; +} + +/* Copies remaining input bytes stored in the bit reader to the output. Value + |num| may not be larger than BrotliGetRemainingBytes. The bit reader must be + warmed up again after this. */ +static BROTLI_INLINE void BrotliCopyBytes(uint8_t* dest, + BrotliBitReader* br, size_t num) { + while (BrotliGetAvailableBits(br) >= 8 && num > 0) { + *dest = (uint8_t)BrotliGetBitsUnmasked(br); + BrotliDropBits(br, 8); + ++dest; + --num; + } + BrotliBitReaderNormalize(br); + if (num > 0) { + memcpy(dest, br->next_in, num); + BrotliDropBytes(br, num); + } +} + +BROTLI_UNUSED_FUNCTION void BrotliBitReaderSuppressUnusedFunctions(void) { + BROTLI_UNUSED(&BrotliBitReaderSuppressUnusedFunctions); + + BROTLI_UNUSED(&BrotliBitReaderGetAvailIn); + BROTLI_UNUSED(&BrotliBitReaderLoadBits); + BROTLI_UNUSED(&BrotliBitReaderRestoreState); + BROTLI_UNUSED(&BrotliBitReaderSaveState); + BROTLI_UNUSED(&BrotliBitReaderSetInput); + BROTLI_UNUSED(&BrotliBitReaderUnload); + BROTLI_UNUSED(&BrotliCheckInputAmount); + BROTLI_UNUSED(&BrotliCopyBytes); + BROTLI_UNUSED(&BrotliFillBitWindow16); + BROTLI_UNUSED(&BrotliGet16BitsUnmasked); + BROTLI_UNUSED(&BrotliGetBits); + BROTLI_UNUSED(&BrotliGetRemainingBytes); + BROTLI_UNUSED(&BrotliJumpToByteBoundary); + BROTLI_UNUSED(&BrotliReadBits24); + BROTLI_UNUSED(&BrotliReadBits32); + BROTLI_UNUSED(&BrotliSafeGetBits); + BROTLI_UNUSED(&BrotliSafeReadBits); + BROTLI_UNUSED(&BrotliSafeReadBits32); +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_DEC_BIT_READER_H_ */ diff --git a/modules/brotli/dec/decode.c b/modules/brotli/dec/decode.c new file mode 100644 index 0000000000..220c7e85c6 --- /dev/null +++ b/modules/brotli/dec/decode.c @@ -0,0 +1,2875 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +#include <brotli/decode.h> + +#include <stdlib.h> /* free, malloc */ +#include <string.h> /* memcpy, memset */ + +#include "../common/constants.h" +#include "../common/context.h" +#include "../common/dictionary.h" +#include "../common/platform.h" +#include "../common/shared_dictionary_internal.h" +#include "../common/transform.h" +#include "../common/version.h" +#include "bit_reader.h" +#include "huffman.h" +#include "prefix.h" +#include "state.h" + +#if defined(BROTLI_TARGET_NEON) +#include <arm_neon.h> +#endif + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +#define BROTLI_FAILURE(CODE) (BROTLI_DUMP(), CODE) + +#define BROTLI_LOG_UINT(name) \ + BROTLI_LOG(("[%s] %s = %lu\n", __func__, #name, (unsigned long)(name))) +#define BROTLI_LOG_ARRAY_INDEX(array_name, idx) \ + BROTLI_LOG(("[%s] %s[%lu] = %lu\n", __func__, #array_name, \ + (unsigned long)(idx), (unsigned long)array_name[idx])) + +#define HUFFMAN_TABLE_BITS 8U +#define HUFFMAN_TABLE_MASK 0xFF + +/* We need the slack region for the following reasons: + - doing up to two 16-byte copies for fast backward copying + - inserting transformed dictionary word: + 255 prefix + 32 base + 255 suffix */ +static const brotli_reg_t kRingBufferWriteAheadSlack = 542; + +static const uint8_t kCodeLengthCodeOrder[BROTLI_CODE_LENGTH_CODES] = { + 1, 2, 3, 4, 0, 5, 17, 6, 16, 7, 8, 9, 10, 11, 12, 13, 14, 15, +}; + +/* Static prefix code for the complex code length code lengths. */ +static const uint8_t kCodeLengthPrefixLength[16] = { + 2, 2, 2, 3, 2, 2, 2, 4, 2, 2, 2, 3, 2, 2, 2, 4, +}; + +static const uint8_t kCodeLengthPrefixValue[16] = { + 0, 4, 3, 2, 0, 4, 3, 1, 0, 4, 3, 2, 0, 4, 3, 5, +}; + +BROTLI_BOOL BrotliDecoderSetParameter( + BrotliDecoderState* state, BrotliDecoderParameter p, uint32_t value) { + if (state->state != BROTLI_STATE_UNINITED) return BROTLI_FALSE; + switch (p) { + case BROTLI_DECODER_PARAM_DISABLE_RING_BUFFER_REALLOCATION: + state->canny_ringbuffer_allocation = !!value ? 0 : 1; + return BROTLI_TRUE; + + case BROTLI_DECODER_PARAM_LARGE_WINDOW: + state->large_window = TO_BROTLI_BOOL(!!value); + return BROTLI_TRUE; + + default: return BROTLI_FALSE; + } +} + +BrotliDecoderState* BrotliDecoderCreateInstance( + brotli_alloc_func alloc_func, brotli_free_func free_func, void* opaque) { + BrotliDecoderState* state = 0; + if (!alloc_func && !free_func) { + state = (BrotliDecoderState*)malloc(sizeof(BrotliDecoderState)); + } else if (alloc_func && free_func) { + state = (BrotliDecoderState*)alloc_func(opaque, sizeof(BrotliDecoderState)); + } + if (state == 0) { + BROTLI_DUMP(); + return 0; + } + if (!BrotliDecoderStateInit(state, alloc_func, free_func, opaque)) { + BROTLI_DUMP(); + if (!alloc_func && !free_func) { + free(state); + } else if (alloc_func && free_func) { + free_func(opaque, state); + } + return 0; + } + return state; +} + +/* Deinitializes and frees BrotliDecoderState instance. */ +void BrotliDecoderDestroyInstance(BrotliDecoderState* state) { + if (!state) { + return; + } else { + brotli_free_func free_func = state->free_func; + void* opaque = state->memory_manager_opaque; + BrotliDecoderStateCleanup(state); + free_func(opaque, state); + } +} + +/* Saves error code and converts it to BrotliDecoderResult. */ +static BROTLI_NOINLINE BrotliDecoderResult SaveErrorCode( + BrotliDecoderState* s, BrotliDecoderErrorCode e, size_t consumed_input) { + s->error_code = (int)e; + s->used_input += consumed_input; + if ((s->buffer_length != 0) && (s->br.next_in == s->br.last_in)) { + /* If internal buffer is depleted at last, reset it. */ + s->buffer_length = 0; + } + switch (e) { + case BROTLI_DECODER_SUCCESS: + return BROTLI_DECODER_RESULT_SUCCESS; + + case BROTLI_DECODER_NEEDS_MORE_INPUT: + return BROTLI_DECODER_RESULT_NEEDS_MORE_INPUT; + + case BROTLI_DECODER_NEEDS_MORE_OUTPUT: + return BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT; + + default: + return BROTLI_DECODER_RESULT_ERROR; + } +} + +/* Decodes WBITS by reading 1 - 7 bits, or 0x11 for "Large Window Brotli". + Precondition: bit-reader accumulator has at least 8 bits. */ +static BrotliDecoderErrorCode DecodeWindowBits(BrotliDecoderState* s, + BrotliBitReader* br) { + brotli_reg_t n; + BROTLI_BOOL large_window = s->large_window; + s->large_window = BROTLI_FALSE; + BrotliTakeBits(br, 1, &n); + if (n == 0) { + s->window_bits = 16; + return BROTLI_DECODER_SUCCESS; + } + BrotliTakeBits(br, 3, &n); + if (n != 0) { + s->window_bits = (17u + n) & 63u; + return BROTLI_DECODER_SUCCESS; + } + BrotliTakeBits(br, 3, &n); + if (n == 1) { + if (large_window) { + BrotliTakeBits(br, 1, &n); + if (n == 1) { + return BROTLI_FAILURE(BROTLI_DECODER_ERROR_FORMAT_WINDOW_BITS); + } + s->large_window = BROTLI_TRUE; + return BROTLI_DECODER_SUCCESS; + } else { + return BROTLI_FAILURE(BROTLI_DECODER_ERROR_FORMAT_WINDOW_BITS); + } + } + if (n != 0) { + s->window_bits = (8u + n) & 63u; + return BROTLI_DECODER_SUCCESS; + } + s->window_bits = 17; + return BROTLI_DECODER_SUCCESS; +} + +static BROTLI_INLINE void memmove16(uint8_t* dst, uint8_t* src) { +#if defined(BROTLI_TARGET_NEON) + vst1q_u8(dst, vld1q_u8(src)); +#else + uint32_t buffer[4]; + memcpy(buffer, src, 16); + memcpy(dst, buffer, 16); +#endif +} + +/* Decodes a number in the range [0..255], by reading 1 - 11 bits. */ +static BROTLI_NOINLINE BrotliDecoderErrorCode DecodeVarLenUint8( + BrotliDecoderState* s, BrotliBitReader* br, brotli_reg_t* value) { + brotli_reg_t bits; + switch (s->substate_decode_uint8) { + case BROTLI_STATE_DECODE_UINT8_NONE: + if (BROTLI_PREDICT_FALSE(!BrotliSafeReadBits(br, 1, &bits))) { + return BROTLI_DECODER_NEEDS_MORE_INPUT; + } + if (bits == 0) { + *value = 0; + return BROTLI_DECODER_SUCCESS; + } + /* Fall through. */ + + case BROTLI_STATE_DECODE_UINT8_SHORT: + if (BROTLI_PREDICT_FALSE(!BrotliSafeReadBits(br, 3, &bits))) { + s->substate_decode_uint8 = BROTLI_STATE_DECODE_UINT8_SHORT; + return BROTLI_DECODER_NEEDS_MORE_INPUT; + } + if (bits == 0) { + *value = 1; + s->substate_decode_uint8 = BROTLI_STATE_DECODE_UINT8_NONE; + return BROTLI_DECODER_SUCCESS; + } + /* Use output value as a temporary storage. It MUST be persisted. */ + *value = bits; + /* Fall through. */ + + case BROTLI_STATE_DECODE_UINT8_LONG: + if (BROTLI_PREDICT_FALSE(!BrotliSafeReadBits(br, *value, &bits))) { + s->substate_decode_uint8 = BROTLI_STATE_DECODE_UINT8_LONG; + return BROTLI_DECODER_NEEDS_MORE_INPUT; + } + *value = (1U << *value) + bits; + s->substate_decode_uint8 = BROTLI_STATE_DECODE_UINT8_NONE; + return BROTLI_DECODER_SUCCESS; + + default: + return + BROTLI_FAILURE(BROTLI_DECODER_ERROR_UNREACHABLE); /* COV_NF_LINE */ + } +} + +/* Decodes a metablock length and flags by reading 2 - 31 bits. */ +static BrotliDecoderErrorCode BROTLI_NOINLINE DecodeMetaBlockLength( + BrotliDecoderState* s, BrotliBitReader* br) { + brotli_reg_t bits; + int i; + for (;;) { + switch (s->substate_metablock_header) { + case BROTLI_STATE_METABLOCK_HEADER_NONE: + if (!BrotliSafeReadBits(br, 1, &bits)) { + return BROTLI_DECODER_NEEDS_MORE_INPUT; + } + s->is_last_metablock = bits ? 1 : 0; + s->meta_block_remaining_len = 0; + s->is_uncompressed = 0; + s->is_metadata = 0; + if (!s->is_last_metablock) { + s->substate_metablock_header = BROTLI_STATE_METABLOCK_HEADER_NIBBLES; + break; + } + s->substate_metablock_header = BROTLI_STATE_METABLOCK_HEADER_EMPTY; + /* Fall through. */ + + case BROTLI_STATE_METABLOCK_HEADER_EMPTY: + if (!BrotliSafeReadBits(br, 1, &bits)) { + return BROTLI_DECODER_NEEDS_MORE_INPUT; + } + if (bits) { + s->substate_metablock_header = BROTLI_STATE_METABLOCK_HEADER_NONE; + return BROTLI_DECODER_SUCCESS; + } + s->substate_metablock_header = BROTLI_STATE_METABLOCK_HEADER_NIBBLES; + /* Fall through. */ + + case BROTLI_STATE_METABLOCK_HEADER_NIBBLES: + if (!BrotliSafeReadBits(br, 2, &bits)) { + return BROTLI_DECODER_NEEDS_MORE_INPUT; + } + s->size_nibbles = (uint8_t)(bits + 4); + s->loop_counter = 0; + if (bits == 3) { + s->is_metadata = 1; + s->substate_metablock_header = BROTLI_STATE_METABLOCK_HEADER_RESERVED; + break; + } + s->substate_metablock_header = BROTLI_STATE_METABLOCK_HEADER_SIZE; + /* Fall through. */ + + case BROTLI_STATE_METABLOCK_HEADER_SIZE: + i = s->loop_counter; + for (; i < (int)s->size_nibbles; ++i) { + if (!BrotliSafeReadBits(br, 4, &bits)) { + s->loop_counter = i; + return BROTLI_DECODER_NEEDS_MORE_INPUT; + } + if (i + 1 == (int)s->size_nibbles && s->size_nibbles > 4 && + bits == 0) { + return BROTLI_FAILURE(BROTLI_DECODER_ERROR_FORMAT_EXUBERANT_NIBBLE); + } + s->meta_block_remaining_len |= (int)(bits << (i * 4)); + } + s->substate_metablock_header = + BROTLI_STATE_METABLOCK_HEADER_UNCOMPRESSED; + /* Fall through. */ + + case BROTLI_STATE_METABLOCK_HEADER_UNCOMPRESSED: + if (!s->is_last_metablock) { + if (!BrotliSafeReadBits(br, 1, &bits)) { + return BROTLI_DECODER_NEEDS_MORE_INPUT; + } + s->is_uncompressed = bits ? 1 : 0; + } + ++s->meta_block_remaining_len; + s->substate_metablock_header = BROTLI_STATE_METABLOCK_HEADER_NONE; + return BROTLI_DECODER_SUCCESS; + + case BROTLI_STATE_METABLOCK_HEADER_RESERVED: + if (!BrotliSafeReadBits(br, 1, &bits)) { + return BROTLI_DECODER_NEEDS_MORE_INPUT; + } + if (bits != 0) { + return BROTLI_FAILURE(BROTLI_DECODER_ERROR_FORMAT_RESERVED); + } + s->substate_metablock_header = BROTLI_STATE_METABLOCK_HEADER_BYTES; + /* Fall through. */ + + case BROTLI_STATE_METABLOCK_HEADER_BYTES: + if (!BrotliSafeReadBits(br, 2, &bits)) { + return BROTLI_DECODER_NEEDS_MORE_INPUT; + } + if (bits == 0) { + s->substate_metablock_header = BROTLI_STATE_METABLOCK_HEADER_NONE; + return BROTLI_DECODER_SUCCESS; + } + s->size_nibbles = (uint8_t)bits; + s->substate_metablock_header = BROTLI_STATE_METABLOCK_HEADER_METADATA; + /* Fall through. */ + + case BROTLI_STATE_METABLOCK_HEADER_METADATA: + i = s->loop_counter; + for (; i < (int)s->size_nibbles; ++i) { + if (!BrotliSafeReadBits(br, 8, &bits)) { + s->loop_counter = i; + return BROTLI_DECODER_NEEDS_MORE_INPUT; + } + if (i + 1 == (int)s->size_nibbles && s->size_nibbles > 1 && + bits == 0) { + return BROTLI_FAILURE( + BROTLI_DECODER_ERROR_FORMAT_EXUBERANT_META_NIBBLE); + } + s->meta_block_remaining_len |= (int)(bits << (i * 8)); + } + ++s->meta_block_remaining_len; + s->substate_metablock_header = BROTLI_STATE_METABLOCK_HEADER_NONE; + return BROTLI_DECODER_SUCCESS; + + default: + return + BROTLI_FAILURE(BROTLI_DECODER_ERROR_UNREACHABLE); /* COV_NF_LINE */ + } + } +} + +/* Decodes the Huffman code. + This method doesn't read data from the bit reader, BUT drops the amount of + bits that correspond to the decoded symbol. + bits MUST contain at least 15 (BROTLI_HUFFMAN_MAX_CODE_LENGTH) valid bits. */ +static BROTLI_INLINE brotli_reg_t DecodeSymbol(brotli_reg_t bits, + const HuffmanCode* table, + BrotliBitReader* br) { + BROTLI_HC_MARK_TABLE_FOR_FAST_LOAD(table); + BROTLI_HC_ADJUST_TABLE_INDEX(table, bits & HUFFMAN_TABLE_MASK); + if (BROTLI_HC_FAST_LOAD_BITS(table) > HUFFMAN_TABLE_BITS) { + brotli_reg_t nbits = BROTLI_HC_FAST_LOAD_BITS(table) - HUFFMAN_TABLE_BITS; + BrotliDropBits(br, HUFFMAN_TABLE_BITS); + BROTLI_HC_ADJUST_TABLE_INDEX(table, + BROTLI_HC_FAST_LOAD_VALUE(table) + + ((bits >> HUFFMAN_TABLE_BITS) & BitMask(nbits))); + } + BrotliDropBits(br, BROTLI_HC_FAST_LOAD_BITS(table)); + return BROTLI_HC_FAST_LOAD_VALUE(table); +} + +/* Reads and decodes the next Huffman code from bit-stream. + This method peeks 16 bits of input and drops 0 - 15 of them. */ +static BROTLI_INLINE brotli_reg_t ReadSymbol(const HuffmanCode* table, + BrotliBitReader* br) { + return DecodeSymbol(BrotliGet16BitsUnmasked(br), table, br); +} + +/* Same as DecodeSymbol, but it is known that there is less than 15 bits of + input are currently available. */ +static BROTLI_NOINLINE BROTLI_BOOL SafeDecodeSymbol( + const HuffmanCode* table, BrotliBitReader* br, brotli_reg_t* result) { + brotli_reg_t val; + brotli_reg_t available_bits = BrotliGetAvailableBits(br); + BROTLI_HC_MARK_TABLE_FOR_FAST_LOAD(table); + if (available_bits == 0) { + if (BROTLI_HC_FAST_LOAD_BITS(table) == 0) { + *result = BROTLI_HC_FAST_LOAD_VALUE(table); + return BROTLI_TRUE; + } + return BROTLI_FALSE; /* No valid bits at all. */ + } + val = BrotliGetBitsUnmasked(br); + BROTLI_HC_ADJUST_TABLE_INDEX(table, val & HUFFMAN_TABLE_MASK); + if (BROTLI_HC_FAST_LOAD_BITS(table) <= HUFFMAN_TABLE_BITS) { + if (BROTLI_HC_FAST_LOAD_BITS(table) <= available_bits) { + BrotliDropBits(br, BROTLI_HC_FAST_LOAD_BITS(table)); + *result = BROTLI_HC_FAST_LOAD_VALUE(table); + return BROTLI_TRUE; + } else { + return BROTLI_FALSE; /* Not enough bits for the first level. */ + } + } + if (available_bits <= HUFFMAN_TABLE_BITS) { + return BROTLI_FALSE; /* Not enough bits to move to the second level. */ + } + + /* Speculatively drop HUFFMAN_TABLE_BITS. */ + val = (val & BitMask(BROTLI_HC_FAST_LOAD_BITS(table))) >> HUFFMAN_TABLE_BITS; + available_bits -= HUFFMAN_TABLE_BITS; + BROTLI_HC_ADJUST_TABLE_INDEX(table, BROTLI_HC_FAST_LOAD_VALUE(table) + val); + if (available_bits < BROTLI_HC_FAST_LOAD_BITS(table)) { + return BROTLI_FALSE; /* Not enough bits for the second level. */ + } + + BrotliDropBits(br, HUFFMAN_TABLE_BITS + BROTLI_HC_FAST_LOAD_BITS(table)); + *result = BROTLI_HC_FAST_LOAD_VALUE(table); + return BROTLI_TRUE; +} + +static BROTLI_INLINE BROTLI_BOOL SafeReadSymbol( + const HuffmanCode* table, BrotliBitReader* br, brotli_reg_t* result) { + brotli_reg_t val; + if (BROTLI_PREDICT_TRUE(BrotliSafeGetBits(br, 15, &val))) { + *result = DecodeSymbol(val, table, br); + return BROTLI_TRUE; + } + return SafeDecodeSymbol(table, br, result); +} + +/* Makes a look-up in first level Huffman table. Peeks 8 bits. */ +static BROTLI_INLINE void PreloadSymbol(int safe, + const HuffmanCode* table, + BrotliBitReader* br, + brotli_reg_t* bits, + brotli_reg_t* value) { + if (safe) { + return; + } + BROTLI_HC_MARK_TABLE_FOR_FAST_LOAD(table); + BROTLI_HC_ADJUST_TABLE_INDEX(table, BrotliGetBits(br, HUFFMAN_TABLE_BITS)); + *bits = BROTLI_HC_FAST_LOAD_BITS(table); + *value = BROTLI_HC_FAST_LOAD_VALUE(table); +} + +/* Decodes the next Huffman code using data prepared by PreloadSymbol. + Reads 0 - 15 bits. Also peeks 8 following bits. */ +static BROTLI_INLINE brotli_reg_t ReadPreloadedSymbol(const HuffmanCode* table, + BrotliBitReader* br, + brotli_reg_t* bits, + brotli_reg_t* value) { + brotli_reg_t result = *value; + if (BROTLI_PREDICT_FALSE(*bits > HUFFMAN_TABLE_BITS)) { + brotli_reg_t val = BrotliGet16BitsUnmasked(br); + const HuffmanCode* ext = table + (val & HUFFMAN_TABLE_MASK) + *value; + brotli_reg_t mask = BitMask((*bits - HUFFMAN_TABLE_BITS)); + BROTLI_HC_MARK_TABLE_FOR_FAST_LOAD(ext); + BrotliDropBits(br, HUFFMAN_TABLE_BITS); + BROTLI_HC_ADJUST_TABLE_INDEX(ext, (val >> HUFFMAN_TABLE_BITS) & mask); + BrotliDropBits(br, BROTLI_HC_FAST_LOAD_BITS(ext)); + result = BROTLI_HC_FAST_LOAD_VALUE(ext); + } else { + BrotliDropBits(br, *bits); + } + PreloadSymbol(0, table, br, bits, value); + return result; +} + +static BROTLI_INLINE brotli_reg_t Log2Floor(brotli_reg_t x) { + brotli_reg_t result = 0; + while (x) { + x >>= 1; + ++result; + } + return result; +} + +/* Reads (s->symbol + 1) symbols. + Totally 1..4 symbols are read, 1..11 bits each. + The list of symbols MUST NOT contain duplicates. */ +static BrotliDecoderErrorCode ReadSimpleHuffmanSymbols( + brotli_reg_t alphabet_size_max, brotli_reg_t alphabet_size_limit, + BrotliDecoderState* s) { + /* max_bits == 1..11; symbol == 0..3; 1..44 bits will be read. */ + BrotliBitReader* br = &s->br; + BrotliMetablockHeaderArena* h = &s->arena.header; + brotli_reg_t max_bits = Log2Floor(alphabet_size_max - 1); + brotli_reg_t i = h->sub_loop_counter; + brotli_reg_t num_symbols = h->symbol; + while (i <= num_symbols) { + brotli_reg_t v; + if (BROTLI_PREDICT_FALSE(!BrotliSafeReadBits(br, max_bits, &v))) { + h->sub_loop_counter = i; + h->substate_huffman = BROTLI_STATE_HUFFMAN_SIMPLE_READ; + return BROTLI_DECODER_NEEDS_MORE_INPUT; + } + if (v >= alphabet_size_limit) { + return + BROTLI_FAILURE(BROTLI_DECODER_ERROR_FORMAT_SIMPLE_HUFFMAN_ALPHABET); + } + h->symbols_lists_array[i] = (uint16_t)v; + BROTLI_LOG_UINT(h->symbols_lists_array[i]); + ++i; + } + + for (i = 0; i < num_symbols; ++i) { + brotli_reg_t k = i + 1; + for (; k <= num_symbols; ++k) { + if (h->symbols_lists_array[i] == h->symbols_lists_array[k]) { + return BROTLI_FAILURE(BROTLI_DECODER_ERROR_FORMAT_SIMPLE_HUFFMAN_SAME); + } + } + } + + return BROTLI_DECODER_SUCCESS; +} + +/* Process single decoded symbol code length: + A) reset the repeat variable + B) remember code length (if it is not 0) + C) extend corresponding index-chain + D) reduce the Huffman space + E) update the histogram */ +static BROTLI_INLINE void ProcessSingleCodeLength(brotli_reg_t code_len, + brotli_reg_t* symbol, brotli_reg_t* repeat, brotli_reg_t* space, + brotli_reg_t* prev_code_len, uint16_t* symbol_lists, + uint16_t* code_length_histo, int* next_symbol) { + *repeat = 0; + if (code_len != 0) { /* code_len == 1..15 */ + symbol_lists[next_symbol[code_len]] = (uint16_t)(*symbol); + next_symbol[code_len] = (int)(*symbol); + *prev_code_len = code_len; + *space -= 32768U >> code_len; + code_length_histo[code_len]++; + BROTLI_LOG(("[ReadHuffmanCode] code_length[%d] = %d\n", + (int)*symbol, (int)code_len)); + } + (*symbol)++; +} + +/* Process repeated symbol code length. + A) Check if it is the extension of previous repeat sequence; if the decoded + value is not BROTLI_REPEAT_PREVIOUS_CODE_LENGTH, then it is a new + symbol-skip + B) Update repeat variable + C) Check if operation is feasible (fits alphabet) + D) For each symbol do the same operations as in ProcessSingleCodeLength + + PRECONDITION: code_len == BROTLI_REPEAT_PREVIOUS_CODE_LENGTH or + code_len == BROTLI_REPEAT_ZERO_CODE_LENGTH */ +static BROTLI_INLINE void ProcessRepeatedCodeLength(brotli_reg_t code_len, + brotli_reg_t repeat_delta, brotli_reg_t alphabet_size, brotli_reg_t* symbol, + brotli_reg_t* repeat, brotli_reg_t* space, brotli_reg_t* prev_code_len, + brotli_reg_t* repeat_code_len, uint16_t* symbol_lists, + uint16_t* code_length_histo, int* next_symbol) { + brotli_reg_t old_repeat; + brotli_reg_t extra_bits = 3; /* for BROTLI_REPEAT_ZERO_CODE_LENGTH */ + brotli_reg_t new_len = 0; /* for BROTLI_REPEAT_ZERO_CODE_LENGTH */ + if (code_len == BROTLI_REPEAT_PREVIOUS_CODE_LENGTH) { + new_len = *prev_code_len; + extra_bits = 2; + } + if (*repeat_code_len != new_len) { + *repeat = 0; + *repeat_code_len = new_len; + } + old_repeat = *repeat; + if (*repeat > 0) { + *repeat -= 2; + *repeat <<= extra_bits; + } + *repeat += repeat_delta + 3U; + repeat_delta = *repeat - old_repeat; + if (*symbol + repeat_delta > alphabet_size) { + BROTLI_DUMP(); + *symbol = alphabet_size; + *space = 0xFFFFF; + return; + } + BROTLI_LOG(("[ReadHuffmanCode] code_length[%d..%d] = %d\n", + (int)*symbol, (int)(*symbol + repeat_delta - 1), (int)*repeat_code_len)); + if (*repeat_code_len != 0) { + brotli_reg_t last = *symbol + repeat_delta; + int next = next_symbol[*repeat_code_len]; + do { + symbol_lists[next] = (uint16_t)*symbol; + next = (int)*symbol; + } while (++(*symbol) != last); + next_symbol[*repeat_code_len] = next; + *space -= repeat_delta << (15 - *repeat_code_len); + code_length_histo[*repeat_code_len] = + (uint16_t)(code_length_histo[*repeat_code_len] + repeat_delta); + } else { + *symbol += repeat_delta; + } +} + +/* Reads and decodes symbol codelengths. */ +static BrotliDecoderErrorCode ReadSymbolCodeLengths( + brotli_reg_t alphabet_size, BrotliDecoderState* s) { + BrotliBitReader* br = &s->br; + BrotliMetablockHeaderArena* h = &s->arena.header; + brotli_reg_t symbol = h->symbol; + brotli_reg_t repeat = h->repeat; + brotli_reg_t space = h->space; + brotli_reg_t prev_code_len = h->prev_code_len; + brotli_reg_t repeat_code_len = h->repeat_code_len; + uint16_t* symbol_lists = h->symbol_lists; + uint16_t* code_length_histo = h->code_length_histo; + int* next_symbol = h->next_symbol; + if (!BrotliWarmupBitReader(br)) { + return BROTLI_DECODER_NEEDS_MORE_INPUT; + } + while (symbol < alphabet_size && space > 0) { + const HuffmanCode* p = h->table; + brotli_reg_t code_len; + BROTLI_HC_MARK_TABLE_FOR_FAST_LOAD(p); + if (!BrotliCheckInputAmount(br)) { + h->symbol = symbol; + h->repeat = repeat; + h->prev_code_len = prev_code_len; + h->repeat_code_len = repeat_code_len; + h->space = space; + return BROTLI_DECODER_NEEDS_MORE_INPUT; + } + BrotliFillBitWindow16(br); + BROTLI_HC_ADJUST_TABLE_INDEX(p, BrotliGetBitsUnmasked(br) & + BitMask(BROTLI_HUFFMAN_MAX_CODE_LENGTH_CODE_LENGTH)); + BrotliDropBits(br, BROTLI_HC_FAST_LOAD_BITS(p)); /* Use 1..5 bits. */ + code_len = BROTLI_HC_FAST_LOAD_VALUE(p); /* code_len == 0..17 */ + if (code_len < BROTLI_REPEAT_PREVIOUS_CODE_LENGTH) { + ProcessSingleCodeLength(code_len, &symbol, &repeat, &space, + &prev_code_len, symbol_lists, code_length_histo, next_symbol); + } else { /* code_len == 16..17, extra_bits == 2..3 */ + brotli_reg_t extra_bits = + (code_len == BROTLI_REPEAT_PREVIOUS_CODE_LENGTH) ? 2 : 3; + brotli_reg_t repeat_delta = + BrotliGetBitsUnmasked(br) & BitMask(extra_bits); + BrotliDropBits(br, extra_bits); + ProcessRepeatedCodeLength(code_len, repeat_delta, alphabet_size, + &symbol, &repeat, &space, &prev_code_len, &repeat_code_len, + symbol_lists, code_length_histo, next_symbol); + } + } + h->space = space; + return BROTLI_DECODER_SUCCESS; +} + +static BrotliDecoderErrorCode SafeReadSymbolCodeLengths( + brotli_reg_t alphabet_size, BrotliDecoderState* s) { + BrotliBitReader* br = &s->br; + BrotliMetablockHeaderArena* h = &s->arena.header; + BROTLI_BOOL get_byte = BROTLI_FALSE; + while (h->symbol < alphabet_size && h->space > 0) { + const HuffmanCode* p = h->table; + brotli_reg_t code_len; + brotli_reg_t available_bits; + brotli_reg_t bits = 0; + BROTLI_HC_MARK_TABLE_FOR_FAST_LOAD(p); + if (get_byte && !BrotliPullByte(br)) return BROTLI_DECODER_NEEDS_MORE_INPUT; + get_byte = BROTLI_FALSE; + available_bits = BrotliGetAvailableBits(br); + if (available_bits != 0) { + bits = (uint32_t)BrotliGetBitsUnmasked(br); + } + BROTLI_HC_ADJUST_TABLE_INDEX(p, + bits & BitMask(BROTLI_HUFFMAN_MAX_CODE_LENGTH_CODE_LENGTH)); + if (BROTLI_HC_FAST_LOAD_BITS(p) > available_bits) { + get_byte = BROTLI_TRUE; + continue; + } + code_len = BROTLI_HC_FAST_LOAD_VALUE(p); /* code_len == 0..17 */ + if (code_len < BROTLI_REPEAT_PREVIOUS_CODE_LENGTH) { + BrotliDropBits(br, BROTLI_HC_FAST_LOAD_BITS(p)); + ProcessSingleCodeLength(code_len, &h->symbol, &h->repeat, &h->space, + &h->prev_code_len, h->symbol_lists, h->code_length_histo, + h->next_symbol); + } else { /* code_len == 16..17, extra_bits == 2..3 */ + brotli_reg_t extra_bits = code_len - 14U; + brotli_reg_t repeat_delta = (bits >> BROTLI_HC_FAST_LOAD_BITS(p)) & + BitMask(extra_bits); + if (available_bits < BROTLI_HC_FAST_LOAD_BITS(p) + extra_bits) { + get_byte = BROTLI_TRUE; + continue; + } + BrotliDropBits(br, BROTLI_HC_FAST_LOAD_BITS(p) + extra_bits); + ProcessRepeatedCodeLength(code_len, repeat_delta, alphabet_size, + &h->symbol, &h->repeat, &h->space, &h->prev_code_len, + &h->repeat_code_len, h->symbol_lists, h->code_length_histo, + h->next_symbol); + } + } + return BROTLI_DECODER_SUCCESS; +} + +/* Reads and decodes 15..18 codes using static prefix code. + Each code is 2..4 bits long. In total 30..72 bits are used. */ +static BrotliDecoderErrorCode ReadCodeLengthCodeLengths(BrotliDecoderState* s) { + BrotliBitReader* br = &s->br; + BrotliMetablockHeaderArena* h = &s->arena.header; + brotli_reg_t num_codes = h->repeat; + brotli_reg_t space = h->space; + brotli_reg_t i = h->sub_loop_counter; + for (; i < BROTLI_CODE_LENGTH_CODES; ++i) { + const uint8_t code_len_idx = kCodeLengthCodeOrder[i]; + brotli_reg_t ix; + brotli_reg_t v; + if (BROTLI_PREDICT_FALSE(!BrotliSafeGetBits(br, 4, &ix))) { + brotli_reg_t available_bits = BrotliGetAvailableBits(br); + if (available_bits != 0) { + ix = BrotliGetBitsUnmasked(br) & 0xF; + } else { + ix = 0; + } + if (kCodeLengthPrefixLength[ix] > available_bits) { + h->sub_loop_counter = i; + h->repeat = num_codes; + h->space = space; + h->substate_huffman = BROTLI_STATE_HUFFMAN_COMPLEX; + return BROTLI_DECODER_NEEDS_MORE_INPUT; + } + } + v = kCodeLengthPrefixValue[ix]; + BrotliDropBits(br, kCodeLengthPrefixLength[ix]); + h->code_length_code_lengths[code_len_idx] = (uint8_t)v; + BROTLI_LOG_ARRAY_INDEX(h->code_length_code_lengths, code_len_idx); + if (v != 0) { + space = space - (32U >> v); + ++num_codes; + ++h->code_length_histo[v]; + if (space - 1U >= 32U) { + /* space is 0 or wrapped around. */ + break; + } + } + } + if (!(num_codes == 1 || space == 0)) { + return BROTLI_FAILURE(BROTLI_DECODER_ERROR_FORMAT_CL_SPACE); + } + return BROTLI_DECODER_SUCCESS; +} + +/* Decodes the Huffman tables. + There are 2 scenarios: + A) Huffman code contains only few symbols (1..4). Those symbols are read + directly; their code lengths are defined by the number of symbols. + For this scenario 4 - 49 bits will be read. + + B) 2-phase decoding: + B.1) Small Huffman table is decoded; it is specified with code lengths + encoded with predefined entropy code. 32 - 74 bits are used. + B.2) Decoded table is used to decode code lengths of symbols in resulting + Huffman table. In worst case 3520 bits are read. */ +static BrotliDecoderErrorCode ReadHuffmanCode(brotli_reg_t alphabet_size_max, + brotli_reg_t alphabet_size_limit, + HuffmanCode* table, + brotli_reg_t* opt_table_size, + BrotliDecoderState* s) { + BrotliBitReader* br = &s->br; + BrotliMetablockHeaderArena* h = &s->arena.header; + /* State machine. */ + for (;;) { + switch (h->substate_huffman) { + case BROTLI_STATE_HUFFMAN_NONE: + if (!BrotliSafeReadBits(br, 2, &h->sub_loop_counter)) { + return BROTLI_DECODER_NEEDS_MORE_INPUT; + } + BROTLI_LOG_UINT(h->sub_loop_counter); + /* The value is used as follows: + 1 for simple code; + 0 for no skipping, 2 skips 2 code lengths, 3 skips 3 code lengths */ + if (h->sub_loop_counter != 1) { + h->space = 32; + h->repeat = 0; /* num_codes */ + memset(&h->code_length_histo[0], 0, sizeof(h->code_length_histo[0]) * + (BROTLI_HUFFMAN_MAX_CODE_LENGTH_CODE_LENGTH + 1)); + memset(&h->code_length_code_lengths[0], 0, + sizeof(h->code_length_code_lengths)); + h->substate_huffman = BROTLI_STATE_HUFFMAN_COMPLEX; + continue; + } + /* Fall through. */ + + case BROTLI_STATE_HUFFMAN_SIMPLE_SIZE: + /* Read symbols, codes & code lengths directly. */ + if (!BrotliSafeReadBits(br, 2, &h->symbol)) { /* num_symbols */ + h->substate_huffman = BROTLI_STATE_HUFFMAN_SIMPLE_SIZE; + return BROTLI_DECODER_NEEDS_MORE_INPUT; + } + h->sub_loop_counter = 0; + /* Fall through. */ + + case BROTLI_STATE_HUFFMAN_SIMPLE_READ: { + BrotliDecoderErrorCode result = + ReadSimpleHuffmanSymbols(alphabet_size_max, alphabet_size_limit, s); + if (result != BROTLI_DECODER_SUCCESS) { + return result; + } + } + /* Fall through. */ + + case BROTLI_STATE_HUFFMAN_SIMPLE_BUILD: { + brotli_reg_t table_size; + if (h->symbol == 3) { + brotli_reg_t bits; + if (!BrotliSafeReadBits(br, 1, &bits)) { + h->substate_huffman = BROTLI_STATE_HUFFMAN_SIMPLE_BUILD; + return BROTLI_DECODER_NEEDS_MORE_INPUT; + } + h->symbol += bits; + } + BROTLI_LOG_UINT(h->symbol); + table_size = BrotliBuildSimpleHuffmanTable(table, HUFFMAN_TABLE_BITS, + h->symbols_lists_array, + (uint32_t)h->symbol); + if (opt_table_size) { + *opt_table_size = table_size; + } + h->substate_huffman = BROTLI_STATE_HUFFMAN_NONE; + return BROTLI_DECODER_SUCCESS; + } + + /* Decode Huffman-coded code lengths. */ + case BROTLI_STATE_HUFFMAN_COMPLEX: { + brotli_reg_t i; + BrotliDecoderErrorCode result = ReadCodeLengthCodeLengths(s); + if (result != BROTLI_DECODER_SUCCESS) { + return result; + } + BrotliBuildCodeLengthsHuffmanTable(h->table, + h->code_length_code_lengths, + h->code_length_histo); + memset(&h->code_length_histo[0], 0, sizeof(h->code_length_histo)); + for (i = 0; i <= BROTLI_HUFFMAN_MAX_CODE_LENGTH; ++i) { + h->next_symbol[i] = (int)i - (BROTLI_HUFFMAN_MAX_CODE_LENGTH + 1); + h->symbol_lists[h->next_symbol[i]] = 0xFFFF; + } + + h->symbol = 0; + h->prev_code_len = BROTLI_INITIAL_REPEATED_CODE_LENGTH; + h->repeat = 0; + h->repeat_code_len = 0; + h->space = 32768; + h->substate_huffman = BROTLI_STATE_HUFFMAN_LENGTH_SYMBOLS; + } + /* Fall through. */ + + case BROTLI_STATE_HUFFMAN_LENGTH_SYMBOLS: { + brotli_reg_t table_size; + BrotliDecoderErrorCode result = ReadSymbolCodeLengths( + alphabet_size_limit, s); + if (result == BROTLI_DECODER_NEEDS_MORE_INPUT) { + result = SafeReadSymbolCodeLengths(alphabet_size_limit, s); + } + if (result != BROTLI_DECODER_SUCCESS) { + return result; + } + + if (h->space != 0) { + BROTLI_LOG(("[ReadHuffmanCode] space = %d\n", (int)h->space)); + return BROTLI_FAILURE(BROTLI_DECODER_ERROR_FORMAT_HUFFMAN_SPACE); + } + table_size = BrotliBuildHuffmanTable( + table, HUFFMAN_TABLE_BITS, h->symbol_lists, h->code_length_histo); + if (opt_table_size) { + *opt_table_size = table_size; + } + h->substate_huffman = BROTLI_STATE_HUFFMAN_NONE; + return BROTLI_DECODER_SUCCESS; + } + + default: + return + BROTLI_FAILURE(BROTLI_DECODER_ERROR_UNREACHABLE); /* COV_NF_LINE */ + } + } +} + +/* Decodes a block length by reading 3..39 bits. */ +static BROTLI_INLINE brotli_reg_t ReadBlockLength(const HuffmanCode* table, + BrotliBitReader* br) { + brotli_reg_t code; + brotli_reg_t nbits; + code = ReadSymbol(table, br); + nbits = _kBrotliPrefixCodeRanges[code].nbits; /* nbits == 2..24 */ + return _kBrotliPrefixCodeRanges[code].offset + BrotliReadBits24(br, nbits); +} + +/* WARNING: if state is not BROTLI_STATE_READ_BLOCK_LENGTH_NONE, then + reading can't be continued with ReadBlockLength. */ +static BROTLI_INLINE BROTLI_BOOL SafeReadBlockLength( + BrotliDecoderState* s, brotli_reg_t* result, const HuffmanCode* table, + BrotliBitReader* br) { + brotli_reg_t index; + if (s->substate_read_block_length == BROTLI_STATE_READ_BLOCK_LENGTH_NONE) { + if (!SafeReadSymbol(table, br, &index)) { + return BROTLI_FALSE; + } + } else { + index = s->block_length_index; + } + { + brotli_reg_t bits; + brotli_reg_t nbits = _kBrotliPrefixCodeRanges[index].nbits; + brotli_reg_t offset = _kBrotliPrefixCodeRanges[index].offset; + if (!BrotliSafeReadBits(br, nbits, &bits)) { + s->block_length_index = index; + s->substate_read_block_length = BROTLI_STATE_READ_BLOCK_LENGTH_SUFFIX; + return BROTLI_FALSE; + } + *result = offset + bits; + s->substate_read_block_length = BROTLI_STATE_READ_BLOCK_LENGTH_NONE; + return BROTLI_TRUE; + } +} + +/* Transform: + 1) initialize list L with values 0, 1,... 255 + 2) For each input element X: + 2.1) let Y = L[X] + 2.2) remove X-th element from L + 2.3) prepend Y to L + 2.4) append Y to output + + In most cases max(Y) <= 7, so most of L remains intact. + To reduce the cost of initialization, we reuse L, remember the upper bound + of Y values, and reinitialize only first elements in L. + + Most of input values are 0 and 1. To reduce number of branches, we replace + inner for loop with do-while. */ +static BROTLI_NOINLINE void InverseMoveToFrontTransform( + uint8_t* v, brotli_reg_t v_len, BrotliDecoderState* state) { + /* Reinitialize elements that could have been changed. */ + brotli_reg_t i = 1; + brotli_reg_t upper_bound = state->mtf_upper_bound; + uint32_t* mtf = &state->mtf[1]; /* Make mtf[-1] addressable. */ + uint8_t* mtf_u8 = (uint8_t*)mtf; + /* Load endian-aware constant. */ + const uint8_t b0123[4] = {0, 1, 2, 3}; + uint32_t pattern; + memcpy(&pattern, &b0123, 4); + + /* Initialize list using 4 consequent values pattern. */ + mtf[0] = pattern; + do { + pattern += 0x04040404; /* Advance all 4 values by 4. */ + mtf[i] = pattern; + i++; + } while (i <= upper_bound); + + /* Transform the input. */ + upper_bound = 0; + for (i = 0; i < v_len; ++i) { + int index = v[i]; + uint8_t value = mtf_u8[index]; + upper_bound |= v[i]; + v[i] = value; + mtf_u8[-1] = value; + do { + index--; + mtf_u8[index + 1] = mtf_u8[index]; + } while (index >= 0); + } + /* Remember amount of elements to be reinitialized. */ + state->mtf_upper_bound = upper_bound >> 2; +} + +/* Decodes a series of Huffman table using ReadHuffmanCode function. */ +static BrotliDecoderErrorCode HuffmanTreeGroupDecode( + HuffmanTreeGroup* group, BrotliDecoderState* s) { + BrotliMetablockHeaderArena* h = &s->arena.header; + if (h->substate_tree_group != BROTLI_STATE_TREE_GROUP_LOOP) { + h->next = group->codes; + h->htree_index = 0; + h->substate_tree_group = BROTLI_STATE_TREE_GROUP_LOOP; + } + while (h->htree_index < group->num_htrees) { + brotli_reg_t table_size; + BrotliDecoderErrorCode result = ReadHuffmanCode(group->alphabet_size_max, + group->alphabet_size_limit, h->next, &table_size, s); + if (result != BROTLI_DECODER_SUCCESS) return result; + group->htrees[h->htree_index] = h->next; + h->next += table_size; + ++h->htree_index; + } + h->substate_tree_group = BROTLI_STATE_TREE_GROUP_NONE; + return BROTLI_DECODER_SUCCESS; +} + +/* Decodes a context map. + Decoding is done in 4 phases: + 1) Read auxiliary information (6..16 bits) and allocate memory. + In case of trivial context map, decoding is finished at this phase. + 2) Decode Huffman table using ReadHuffmanCode function. + This table will be used for reading context map items. + 3) Read context map items; "0" values could be run-length encoded. + 4) Optionally, apply InverseMoveToFront transform to the resulting map. */ +static BrotliDecoderErrorCode DecodeContextMap(brotli_reg_t context_map_size, + brotli_reg_t* num_htrees, + uint8_t** context_map_arg, + BrotliDecoderState* s) { + BrotliBitReader* br = &s->br; + BrotliDecoderErrorCode result = BROTLI_DECODER_SUCCESS; + BrotliMetablockHeaderArena* h = &s->arena.header; + + switch ((int)h->substate_context_map) { + case BROTLI_STATE_CONTEXT_MAP_NONE: + result = DecodeVarLenUint8(s, br, num_htrees); + if (result != BROTLI_DECODER_SUCCESS) { + return result; + } + (*num_htrees)++; + h->context_index = 0; + BROTLI_LOG_UINT(context_map_size); + BROTLI_LOG_UINT(*num_htrees); + *context_map_arg = + (uint8_t*)BROTLI_DECODER_ALLOC(s, (size_t)context_map_size); + if (*context_map_arg == 0) { + return BROTLI_FAILURE(BROTLI_DECODER_ERROR_ALLOC_CONTEXT_MAP); + } + if (*num_htrees <= 1) { + memset(*context_map_arg, 0, (size_t)context_map_size); + return BROTLI_DECODER_SUCCESS; + } + h->substate_context_map = BROTLI_STATE_CONTEXT_MAP_READ_PREFIX; + /* Fall through. */ + + case BROTLI_STATE_CONTEXT_MAP_READ_PREFIX: { + brotli_reg_t bits; + /* In next stage ReadHuffmanCode uses at least 4 bits, so it is safe + to peek 4 bits ahead. */ + if (!BrotliSafeGetBits(br, 5, &bits)) { + return BROTLI_DECODER_NEEDS_MORE_INPUT; + } + if ((bits & 1) != 0) { /* Use RLE for zeros. */ + h->max_run_length_prefix = (bits >> 1) + 1; + BrotliDropBits(br, 5); + } else { + h->max_run_length_prefix = 0; + BrotliDropBits(br, 1); + } + BROTLI_LOG_UINT(h->max_run_length_prefix); + h->substate_context_map = BROTLI_STATE_CONTEXT_MAP_HUFFMAN; + } + /* Fall through. */ + + case BROTLI_STATE_CONTEXT_MAP_HUFFMAN: { + brotli_reg_t alphabet_size = *num_htrees + h->max_run_length_prefix; + result = ReadHuffmanCode(alphabet_size, alphabet_size, + h->context_map_table, NULL, s); + if (result != BROTLI_DECODER_SUCCESS) return result; + h->code = 0xFFFF; + h->substate_context_map = BROTLI_STATE_CONTEXT_MAP_DECODE; + } + /* Fall through. */ + + case BROTLI_STATE_CONTEXT_MAP_DECODE: { + brotli_reg_t context_index = h->context_index; + brotli_reg_t max_run_length_prefix = h->max_run_length_prefix; + uint8_t* context_map = *context_map_arg; + brotli_reg_t code = h->code; + BROTLI_BOOL skip_preamble = (code != 0xFFFF); + while (context_index < context_map_size || skip_preamble) { + if (!skip_preamble) { + if (!SafeReadSymbol(h->context_map_table, br, &code)) { + h->code = 0xFFFF; + h->context_index = context_index; + return BROTLI_DECODER_NEEDS_MORE_INPUT; + } + BROTLI_LOG_UINT(code); + + if (code == 0) { + context_map[context_index++] = 0; + continue; + } + if (code > max_run_length_prefix) { + context_map[context_index++] = + (uint8_t)(code - max_run_length_prefix); + continue; + } + } else { + skip_preamble = BROTLI_FALSE; + } + /* RLE sub-stage. */ + { + brotli_reg_t reps; + if (!BrotliSafeReadBits(br, code, &reps)) { + h->code = code; + h->context_index = context_index; + return BROTLI_DECODER_NEEDS_MORE_INPUT; + } + reps += 1U << code; + BROTLI_LOG_UINT(reps); + if (context_index + reps > context_map_size) { + return + BROTLI_FAILURE(BROTLI_DECODER_ERROR_FORMAT_CONTEXT_MAP_REPEAT); + } + do { + context_map[context_index++] = 0; + } while (--reps); + } + } + } + /* Fall through. */ + + case BROTLI_STATE_CONTEXT_MAP_TRANSFORM: { + brotli_reg_t bits; + if (!BrotliSafeReadBits(br, 1, &bits)) { + h->substate_context_map = BROTLI_STATE_CONTEXT_MAP_TRANSFORM; + return BROTLI_DECODER_NEEDS_MORE_INPUT; + } + if (bits != 0) { + InverseMoveToFrontTransform(*context_map_arg, context_map_size, s); + } + h->substate_context_map = BROTLI_STATE_CONTEXT_MAP_NONE; + return BROTLI_DECODER_SUCCESS; + } + + default: + return + BROTLI_FAILURE(BROTLI_DECODER_ERROR_UNREACHABLE); /* COV_NF_LINE */ + } +} + +/* Decodes a command or literal and updates block type ring-buffer. + Reads 3..54 bits. */ +static BROTLI_INLINE BROTLI_BOOL DecodeBlockTypeAndLength( + int safe, BrotliDecoderState* s, int tree_type) { + brotli_reg_t max_block_type = s->num_block_types[tree_type]; + const HuffmanCode* type_tree = &s->block_type_trees[ + tree_type * BROTLI_HUFFMAN_MAX_SIZE_258]; + const HuffmanCode* len_tree = &s->block_len_trees[ + tree_type * BROTLI_HUFFMAN_MAX_SIZE_26]; + BrotliBitReader* br = &s->br; + brotli_reg_t* ringbuffer = &s->block_type_rb[tree_type * 2]; + brotli_reg_t block_type; + if (max_block_type <= 1) { + return BROTLI_FALSE; + } + + /* Read 0..15 + 3..39 bits. */ + if (!safe) { + block_type = ReadSymbol(type_tree, br); + s->block_length[tree_type] = ReadBlockLength(len_tree, br); + } else { + BrotliBitReaderState memento; + BrotliBitReaderSaveState(br, &memento); + if (!SafeReadSymbol(type_tree, br, &block_type)) return BROTLI_FALSE; + if (!SafeReadBlockLength(s, &s->block_length[tree_type], len_tree, br)) { + s->substate_read_block_length = BROTLI_STATE_READ_BLOCK_LENGTH_NONE; + BrotliBitReaderRestoreState(br, &memento); + return BROTLI_FALSE; + } + } + + if (block_type == 1) { + block_type = ringbuffer[1] + 1; + } else if (block_type == 0) { + block_type = ringbuffer[0]; + } else { + block_type -= 2; + } + if (block_type >= max_block_type) { + block_type -= max_block_type; + } + ringbuffer[0] = ringbuffer[1]; + ringbuffer[1] = block_type; + return BROTLI_TRUE; +} + +static BROTLI_INLINE void DetectTrivialLiteralBlockTypes( + BrotliDecoderState* s) { + size_t i; + for (i = 0; i < 8; ++i) s->trivial_literal_contexts[i] = 0; + for (i = 0; i < s->num_block_types[0]; i++) { + size_t offset = i << BROTLI_LITERAL_CONTEXT_BITS; + size_t error = 0; + size_t sample = s->context_map[offset]; + size_t j; + for (j = 0; j < (1u << BROTLI_LITERAL_CONTEXT_BITS);) { + /* NOLINTNEXTLINE(bugprone-macro-repeated-side-effects) */ + BROTLI_REPEAT_4({ error |= s->context_map[offset + j++] ^ sample; }) + } + if (error == 0) { + s->trivial_literal_contexts[i >> 5] |= 1u << (i & 31); + } + } +} + +static BROTLI_INLINE void PrepareLiteralDecoding(BrotliDecoderState* s) { + uint8_t context_mode; + size_t trivial; + brotli_reg_t block_type = s->block_type_rb[1]; + brotli_reg_t context_offset = block_type << BROTLI_LITERAL_CONTEXT_BITS; + s->context_map_slice = s->context_map + context_offset; + trivial = s->trivial_literal_contexts[block_type >> 5]; + s->trivial_literal_context = (trivial >> (block_type & 31)) & 1; + s->literal_htree = s->literal_hgroup.htrees[s->context_map_slice[0]]; + context_mode = s->context_modes[block_type] & 3; + s->context_lookup = BROTLI_CONTEXT_LUT(context_mode); +} + +/* Decodes the block type and updates the state for literal context. + Reads 3..54 bits. */ +static BROTLI_INLINE BROTLI_BOOL DecodeLiteralBlockSwitchInternal( + int safe, BrotliDecoderState* s) { + if (!DecodeBlockTypeAndLength(safe, s, 0)) { + return BROTLI_FALSE; + } + PrepareLiteralDecoding(s); + return BROTLI_TRUE; +} + +static void BROTLI_NOINLINE DecodeLiteralBlockSwitch(BrotliDecoderState* s) { + DecodeLiteralBlockSwitchInternal(0, s); +} + +static BROTLI_BOOL BROTLI_NOINLINE SafeDecodeLiteralBlockSwitch( + BrotliDecoderState* s) { + return DecodeLiteralBlockSwitchInternal(1, s); +} + +/* Block switch for insert/copy length. + Reads 3..54 bits. */ +static BROTLI_INLINE BROTLI_BOOL DecodeCommandBlockSwitchInternal( + int safe, BrotliDecoderState* s) { + if (!DecodeBlockTypeAndLength(safe, s, 1)) { + return BROTLI_FALSE; + } + s->htree_command = s->insert_copy_hgroup.htrees[s->block_type_rb[3]]; + return BROTLI_TRUE; +} + +static void BROTLI_NOINLINE DecodeCommandBlockSwitch(BrotliDecoderState* s) { + DecodeCommandBlockSwitchInternal(0, s); +} + +static BROTLI_BOOL BROTLI_NOINLINE SafeDecodeCommandBlockSwitch( + BrotliDecoderState* s) { + return DecodeCommandBlockSwitchInternal(1, s); +} + +/* Block switch for distance codes. + Reads 3..54 bits. */ +static BROTLI_INLINE BROTLI_BOOL DecodeDistanceBlockSwitchInternal( + int safe, BrotliDecoderState* s) { + if (!DecodeBlockTypeAndLength(safe, s, 2)) { + return BROTLI_FALSE; + } + s->dist_context_map_slice = s->dist_context_map + + (s->block_type_rb[5] << BROTLI_DISTANCE_CONTEXT_BITS); + s->dist_htree_index = s->dist_context_map_slice[s->distance_context]; + return BROTLI_TRUE; +} + +static void BROTLI_NOINLINE DecodeDistanceBlockSwitch(BrotliDecoderState* s) { + DecodeDistanceBlockSwitchInternal(0, s); +} + +static BROTLI_BOOL BROTLI_NOINLINE SafeDecodeDistanceBlockSwitch( + BrotliDecoderState* s) { + return DecodeDistanceBlockSwitchInternal(1, s); +} + +static size_t UnwrittenBytes(const BrotliDecoderState* s, BROTLI_BOOL wrap) { + size_t pos = wrap && s->pos > s->ringbuffer_size ? + (size_t)s->ringbuffer_size : (size_t)(s->pos); + size_t partial_pos_rb = (s->rb_roundtrips * (size_t)s->ringbuffer_size) + pos; + return partial_pos_rb - s->partial_pos_out; +} + +/* Dumps output. + Returns BROTLI_DECODER_NEEDS_MORE_OUTPUT only if there is more output to push + and either ring-buffer is as big as window size, or |force| is true. */ +static BrotliDecoderErrorCode BROTLI_NOINLINE WriteRingBuffer( + BrotliDecoderState* s, size_t* available_out, uint8_t** next_out, + size_t* total_out, BROTLI_BOOL force) { + uint8_t* start = + s->ringbuffer + (s->partial_pos_out & (size_t)s->ringbuffer_mask); + size_t to_write = UnwrittenBytes(s, BROTLI_TRUE); + size_t num_written = *available_out; + if (num_written > to_write) { + num_written = to_write; + } + if (s->meta_block_remaining_len < 0) { + return BROTLI_FAILURE(BROTLI_DECODER_ERROR_FORMAT_BLOCK_LENGTH_1); + } + if (next_out && !*next_out) { + *next_out = start; + } else { + if (next_out) { + memcpy(*next_out, start, num_written); + *next_out += num_written; + } + } + *available_out -= num_written; + BROTLI_LOG_UINT(to_write); + BROTLI_LOG_UINT(num_written); + s->partial_pos_out += num_written; + if (total_out) { + *total_out = s->partial_pos_out; + } + if (num_written < to_write) { + if (s->ringbuffer_size == (1 << s->window_bits) || force) { + return BROTLI_DECODER_NEEDS_MORE_OUTPUT; + } else { + return BROTLI_DECODER_SUCCESS; + } + } + /* Wrap ring buffer only if it has reached its maximal size. */ + if (s->ringbuffer_size == (1 << s->window_bits) && + s->pos >= s->ringbuffer_size) { + s->pos -= s->ringbuffer_size; + s->rb_roundtrips++; + s->should_wrap_ringbuffer = (size_t)s->pos != 0 ? 1 : 0; + } + return BROTLI_DECODER_SUCCESS; +} + +static void BROTLI_NOINLINE WrapRingBuffer(BrotliDecoderState* s) { + if (s->should_wrap_ringbuffer) { + memcpy(s->ringbuffer, s->ringbuffer_end, (size_t)s->pos); + s->should_wrap_ringbuffer = 0; + } +} + +/* Allocates ring-buffer. + + s->ringbuffer_size MUST be updated by BrotliCalculateRingBufferSize before + this function is called. + + Last two bytes of ring-buffer are initialized to 0, so context calculation + could be done uniformly for the first two and all other positions. */ +static BROTLI_BOOL BROTLI_NOINLINE BrotliEnsureRingBuffer( + BrotliDecoderState* s) { + uint8_t* old_ringbuffer = s->ringbuffer; + if (s->ringbuffer_size == s->new_ringbuffer_size) { + return BROTLI_TRUE; + } + + s->ringbuffer = (uint8_t*)BROTLI_DECODER_ALLOC(s, + (size_t)(s->new_ringbuffer_size) + kRingBufferWriteAheadSlack); + if (s->ringbuffer == 0) { + /* Restore previous value. */ + s->ringbuffer = old_ringbuffer; + return BROTLI_FALSE; + } + s->ringbuffer[s->new_ringbuffer_size - 2] = 0; + s->ringbuffer[s->new_ringbuffer_size - 1] = 0; + + if (!!old_ringbuffer) { + memcpy(s->ringbuffer, old_ringbuffer, (size_t)s->pos); + BROTLI_DECODER_FREE(s, old_ringbuffer); + } + + s->ringbuffer_size = s->new_ringbuffer_size; + s->ringbuffer_mask = s->new_ringbuffer_size - 1; + s->ringbuffer_end = s->ringbuffer + s->ringbuffer_size; + + return BROTLI_TRUE; +} + +static BrotliDecoderErrorCode BROTLI_NOINLINE +SkipMetadataBlock(BrotliDecoderState* s) { + BrotliBitReader* br = &s->br; + + if (s->meta_block_remaining_len == 0) { + return BROTLI_DECODER_SUCCESS; + } + + BROTLI_DCHECK((BrotliGetAvailableBits(br) & 7) == 0); + + /* Drain accumulator. */ + if (BrotliGetAvailableBits(br) >= 8) { + uint8_t buffer[8]; + int nbytes = (int)(BrotliGetAvailableBits(br)) >> 3; + BROTLI_DCHECK(nbytes <= 8); + if (nbytes > s->meta_block_remaining_len) { + nbytes = s->meta_block_remaining_len; + } + BrotliCopyBytes(buffer, br, (size_t)nbytes); + if (s->metadata_chunk_func) { + s->metadata_chunk_func(s->metadata_callback_opaque, buffer, + (size_t)nbytes); + } + s->meta_block_remaining_len -= nbytes; + if (s->meta_block_remaining_len == 0) { + return BROTLI_DECODER_SUCCESS; + } + } + + /* Direct access to metadata is possible. */ + int nbytes = (int)BrotliGetRemainingBytes(br); + if (nbytes > s->meta_block_remaining_len) { + nbytes = s->meta_block_remaining_len; + } + if (nbytes > 0) { + if (s->metadata_chunk_func) { + s->metadata_chunk_func(s->metadata_callback_opaque, br->next_in, + (size_t)nbytes); + } + BrotliDropBytes(br, (size_t)nbytes); + s->meta_block_remaining_len -= nbytes; + if (s->meta_block_remaining_len == 0) { + return BROTLI_DECODER_SUCCESS; + } + } + + BROTLI_DCHECK(BrotliGetRemainingBytes(br) == 0); + + return BROTLI_DECODER_NEEDS_MORE_INPUT; +} + +static BrotliDecoderErrorCode BROTLI_NOINLINE CopyUncompressedBlockToOutput( + size_t* available_out, uint8_t** next_out, size_t* total_out, + BrotliDecoderState* s) { + /* TODO(eustas): avoid allocation for single uncompressed block. */ + if (!BrotliEnsureRingBuffer(s)) { + return BROTLI_FAILURE(BROTLI_DECODER_ERROR_ALLOC_RING_BUFFER_1); + } + + /* State machine */ + for (;;) { + switch (s->substate_uncompressed) { + case BROTLI_STATE_UNCOMPRESSED_NONE: { + int nbytes = (int)BrotliGetRemainingBytes(&s->br); + if (nbytes > s->meta_block_remaining_len) { + nbytes = s->meta_block_remaining_len; + } + if (s->pos + nbytes > s->ringbuffer_size) { + nbytes = s->ringbuffer_size - s->pos; + } + /* Copy remaining bytes from s->br.buf_ to ring-buffer. */ + BrotliCopyBytes(&s->ringbuffer[s->pos], &s->br, (size_t)nbytes); + s->pos += nbytes; + s->meta_block_remaining_len -= nbytes; + if (s->pos < 1 << s->window_bits) { + if (s->meta_block_remaining_len == 0) { + return BROTLI_DECODER_SUCCESS; + } + return BROTLI_DECODER_NEEDS_MORE_INPUT; + } + s->substate_uncompressed = BROTLI_STATE_UNCOMPRESSED_WRITE; + } + /* Fall through. */ + + case BROTLI_STATE_UNCOMPRESSED_WRITE: { + BrotliDecoderErrorCode result; + result = WriteRingBuffer( + s, available_out, next_out, total_out, BROTLI_FALSE); + if (result != BROTLI_DECODER_SUCCESS) { + return result; + } + if (s->ringbuffer_size == 1 << s->window_bits) { + s->max_distance = s->max_backward_distance; + } + s->substate_uncompressed = BROTLI_STATE_UNCOMPRESSED_NONE; + break; + } + } + } + BROTLI_DCHECK(0); /* Unreachable */ +} + +static BROTLI_BOOL AttachCompoundDictionary( + BrotliDecoderState* state, const uint8_t* data, size_t size) { + BrotliDecoderCompoundDictionary* addon = state->compound_dictionary; + if (state->state != BROTLI_STATE_UNINITED) return BROTLI_FALSE; + if (!addon) { + addon = (BrotliDecoderCompoundDictionary*)BROTLI_DECODER_ALLOC( + state, sizeof(BrotliDecoderCompoundDictionary)); + if (!addon) return BROTLI_FALSE; + addon->num_chunks = 0; + addon->total_size = 0; + addon->br_length = 0; + addon->br_copied = 0; + addon->block_bits = -1; + addon->chunk_offsets[0] = 0; + state->compound_dictionary = addon; + } + if (addon->num_chunks == 15) return BROTLI_FALSE; + addon->chunks[addon->num_chunks] = data; + addon->num_chunks++; + addon->total_size += (int)size; + addon->chunk_offsets[addon->num_chunks] = addon->total_size; + return BROTLI_TRUE; +} + +static void EnsureCoumpoundDictionaryInitialized(BrotliDecoderState* state) { + BrotliDecoderCompoundDictionary* addon = state->compound_dictionary; + /* 256 = (1 << 8) slots in block map. */ + int block_bits = 8; + int cursor = 0; + int index = 0; + if (addon->block_bits != -1) return; + while (((addon->total_size - 1) >> block_bits) != 0) block_bits++; + block_bits -= 8; + addon->block_bits = block_bits; + while (cursor < addon->total_size) { + while (addon->chunk_offsets[index + 1] < cursor) index++; + addon->block_map[cursor >> block_bits] = (uint8_t)index; + cursor += 1 << block_bits; + } +} + +static BROTLI_BOOL InitializeCompoundDictionaryCopy(BrotliDecoderState* s, + int address, int length) { + BrotliDecoderCompoundDictionary* addon = s->compound_dictionary; + int index; + EnsureCoumpoundDictionaryInitialized(s); + index = addon->block_map[address >> addon->block_bits]; + while (address >= addon->chunk_offsets[index + 1]) index++; + if (addon->total_size < address + length) return BROTLI_FALSE; + /* Update the recent distances cache. */ + s->dist_rb[s->dist_rb_idx & 3] = s->distance_code; + ++s->dist_rb_idx; + s->meta_block_remaining_len -= length; + addon->br_index = index; + addon->br_offset = address - addon->chunk_offsets[index]; + addon->br_length = length; + addon->br_copied = 0; + return BROTLI_TRUE; +} + +static int GetCompoundDictionarySize(BrotliDecoderState* s) { + return s->compound_dictionary ? s->compound_dictionary->total_size : 0; +} + +static int CopyFromCompoundDictionary(BrotliDecoderState* s, int pos) { + BrotliDecoderCompoundDictionary* addon = s->compound_dictionary; + int orig_pos = pos; + while (addon->br_length != addon->br_copied) { + uint8_t* copy_dst = &s->ringbuffer[pos]; + const uint8_t* copy_src = + addon->chunks[addon->br_index] + addon->br_offset; + int space = s->ringbuffer_size - pos; + int rem_chunk_length = (addon->chunk_offsets[addon->br_index + 1] - + addon->chunk_offsets[addon->br_index]) - addon->br_offset; + int length = addon->br_length - addon->br_copied; + if (length > rem_chunk_length) length = rem_chunk_length; + if (length > space) length = space; + memcpy(copy_dst, copy_src, (size_t)length); + pos += length; + addon->br_offset += length; + addon->br_copied += length; + if (length == rem_chunk_length) { + addon->br_index++; + addon->br_offset = 0; + } + if (pos == s->ringbuffer_size) break; + } + return pos - orig_pos; +} + +BROTLI_BOOL BrotliDecoderAttachDictionary( + BrotliDecoderState* state, BrotliSharedDictionaryType type, + size_t data_size, const uint8_t data[BROTLI_ARRAY_PARAM(data_size)]) { + brotli_reg_t i; + brotli_reg_t num_prefix_before = state->dictionary->num_prefix; + if (state->state != BROTLI_STATE_UNINITED) return BROTLI_FALSE; + if (!BrotliSharedDictionaryAttach(state->dictionary, type, data_size, data)) { + return BROTLI_FALSE; + } + for (i = num_prefix_before; i < state->dictionary->num_prefix; i++) { + if (!AttachCompoundDictionary( + state, state->dictionary->prefix[i], + state->dictionary->prefix_size[i])) { + return BROTLI_FALSE; + } + } + return BROTLI_TRUE; +} + +/* Calculates the smallest feasible ring buffer. + + If we know the data size is small, do not allocate more ring buffer + size than needed to reduce memory usage. + + When this method is called, metablock size and flags MUST be decoded. */ +static void BROTLI_NOINLINE BrotliCalculateRingBufferSize( + BrotliDecoderState* s) { + int window_size = 1 << s->window_bits; + int new_ringbuffer_size = window_size; + /* We need at least 2 bytes of ring buffer size to get the last two + bytes for context from there */ + int min_size = s->ringbuffer_size ? s->ringbuffer_size : 1024; + int output_size; + + /* If maximum is already reached, no further extension is retired. */ + if (s->ringbuffer_size == window_size) { + return; + } + + /* Metadata blocks does not touch ring buffer. */ + if (s->is_metadata) { + return; + } + + if (!s->ringbuffer) { + output_size = 0; + } else { + output_size = s->pos; + } + output_size += s->meta_block_remaining_len; + min_size = min_size < output_size ? output_size : min_size; + + if (!!s->canny_ringbuffer_allocation) { + /* Reduce ring buffer size to save memory when server is unscrupulous. + In worst case memory usage might be 1.5x bigger for a short period of + ring buffer reallocation. */ + while ((new_ringbuffer_size >> 1) >= min_size) { + new_ringbuffer_size >>= 1; + } + } + + s->new_ringbuffer_size = new_ringbuffer_size; +} + +/* Reads 1..256 2-bit context modes. */ +static BrotliDecoderErrorCode ReadContextModes(BrotliDecoderState* s) { + BrotliBitReader* br = &s->br; + int i = s->loop_counter; + + while (i < (int)s->num_block_types[0]) { + brotli_reg_t bits; + if (!BrotliSafeReadBits(br, 2, &bits)) { + s->loop_counter = i; + return BROTLI_DECODER_NEEDS_MORE_INPUT; + } + s->context_modes[i] = (uint8_t)bits; + BROTLI_LOG_ARRAY_INDEX(s->context_modes, i); + i++; + } + return BROTLI_DECODER_SUCCESS; +} + +static BROTLI_INLINE void TakeDistanceFromRingBuffer(BrotliDecoderState* s) { + int offset = s->distance_code - 3; + if (s->distance_code <= 3) { + /* Compensate double distance-ring-buffer roll for dictionary items. */ + s->distance_context = 1 >> s->distance_code; + s->distance_code = s->dist_rb[(s->dist_rb_idx - offset) & 3]; + s->dist_rb_idx -= s->distance_context; + } else { + int index_delta = 3; + int delta; + int base = s->distance_code - 10; + if (s->distance_code < 10) { + base = s->distance_code - 4; + } else { + index_delta = 2; + } + /* Unpack one of six 4-bit values. */ + delta = ((0x605142 >> (4 * base)) & 0xF) - 3; + s->distance_code = s->dist_rb[(s->dist_rb_idx + index_delta) & 0x3] + delta; + if (s->distance_code <= 0) { + /* A huge distance will cause a BROTLI_FAILURE() soon. + This is a little faster than failing here. */ + s->distance_code = 0x7FFFFFFF; + } + } +} + +static BROTLI_INLINE BROTLI_BOOL SafeReadBits( + BrotliBitReader* const br, brotli_reg_t n_bits, brotli_reg_t* val) { + if (n_bits != 0) { + return BrotliSafeReadBits(br, n_bits, val); + } else { + *val = 0; + return BROTLI_TRUE; + } +} + +static BROTLI_INLINE BROTLI_BOOL SafeReadBits32( + BrotliBitReader* const br, brotli_reg_t n_bits, brotli_reg_t* val) { + if (n_bits != 0) { + return BrotliSafeReadBits32(br, n_bits, val); + } else { + *val = 0; + return BROTLI_TRUE; + } +} + +/* + RFC 7932 Section 4 with "..." shortenings and "[]" emendations. + + Each distance ... is represented with a pair <distance code, extra bits>... + The distance code is encoded using a prefix code... The number of extra bits + can be 0..24... Two additional parameters: NPOSTFIX (0..3), and ... + NDIRECT (0..120) ... are encoded in the meta-block header... + + The first 16 distance symbols ... reference past distances... ring buffer ... + Next NDIRECT distance symbols ... represent distances from 1 to NDIRECT... + [For] distance symbols 16 + NDIRECT and greater ... the number of extra bits + ... is given by the following formula: + + [ xcode = dcode - NDIRECT - 16 ] + ndistbits = 1 + [ xcode ] >> (NPOSTFIX + 1) + + ... +*/ + +/* + RFC 7932 Section 9.2 with "..." shortenings and "[]" emendations. + + ... to get the actual value of the parameter NDIRECT, left-shift this + four-bit number by NPOSTFIX bits ... +*/ + +/* Remaining formulas from RFC 7932 Section 4 could be rewritten as following: + + alphabet_size = 16 + NDIRECT + (max_distbits << (NPOSTFIX + 1)) + + half = ((xcode >> NPOSTFIX) & 1) << ndistbits + postfix = xcode & ((1 << NPOSTFIX) - 1) + range_start = 2 * (1 << ndistbits - 1 - 1) + + distance = (range_start + half + extra) << NPOSTFIX + postfix + NDIRECT + 1 + + NB: ndistbits >= 1 -> range_start >= 0 + NB: range_start has factor 2, as the range is covered by 2 "halves" + NB: extra -1 offset in range_start formula covers the absence of + ndistbits = 0 case + NB: when NPOSTFIX = 0, NDIRECT is not greater than 15 + + In other words, xcode has the following binary structure - XXXHPPP: + - XXX represent the number of extra distance bits + - H selects upper / lower range of distances + - PPP represent "postfix" + + "Regular" distance encoding has NPOSTFIX = 0; omitting the postfix part + simplifies distance calculation. + + Using NPOSTFIX > 0 allows cheaper encoding of regular structures, e.g. where + most of distances have the same reminder of division by 2/4/8. For example, + the table of int32_t values that come from different sources; if it is likely + that 3 highest bytes of values from the same source are the same, then + copy distance often looks like 4x + y. + + Distance calculation could be rewritten to: + + ndistbits = NDISTBITS(NDIRECT, NPOSTFIX)[dcode] + distance = OFFSET(NDIRECT, NPOSTFIX)[dcode] + extra << NPOSTFIX + + NDISTBITS and OFFSET could be pre-calculated, as NDIRECT and NPOSTFIX could + change only once per meta-block. +*/ + +/* Calculates distance lookup table. + NB: it is possible to have all 64 tables precalculated. */ +static void CalculateDistanceLut(BrotliDecoderState* s) { + BrotliMetablockBodyArena* b = &s->arena.body; + brotli_reg_t npostfix = s->distance_postfix_bits; + brotli_reg_t ndirect = s->num_direct_distance_codes; + brotli_reg_t alphabet_size_limit = s->distance_hgroup.alphabet_size_limit; + brotli_reg_t postfix = 1u << npostfix; + brotli_reg_t j; + brotli_reg_t bits = 1; + brotli_reg_t half = 0; + + /* Skip short codes. */ + brotli_reg_t i = BROTLI_NUM_DISTANCE_SHORT_CODES; + + /* Fill direct codes. */ + for (j = 0; j < ndirect; ++j) { + b->dist_extra_bits[i] = 0; + b->dist_offset[i] = j + 1; + ++i; + } + + /* Fill regular distance codes. */ + while (i < alphabet_size_limit) { + brotli_reg_t base = ndirect + ((((2 + half) << bits) - 4) << npostfix) + 1; + /* Always fill the complete group. */ + for (j = 0; j < postfix; ++j) { + b->dist_extra_bits[i] = (uint8_t)bits; + b->dist_offset[i] = base + j; + ++i; + } + bits = bits + half; + half = half ^ 1; + } +} + +/* Precondition: s->distance_code < 0. */ +static BROTLI_INLINE BROTLI_BOOL ReadDistanceInternal( + int safe, BrotliDecoderState* s, BrotliBitReader* br) { + BrotliMetablockBodyArena* b = &s->arena.body; + brotli_reg_t code; + brotli_reg_t bits; + BrotliBitReaderState memento; + HuffmanCode* distance_tree = s->distance_hgroup.htrees[s->dist_htree_index]; + if (!safe) { + code = ReadSymbol(distance_tree, br); + } else { + BrotliBitReaderSaveState(br, &memento); + if (!SafeReadSymbol(distance_tree, br, &code)) { + return BROTLI_FALSE; + } + } + --s->block_length[2]; + /* Convert the distance code to the actual distance by possibly + looking up past distances from the s->dist_rb. */ + s->distance_context = 0; + if ((code & ~0xFu) == 0) { + s->distance_code = (int)code; + TakeDistanceFromRingBuffer(s); + return BROTLI_TRUE; + } + if (!safe) { + bits = BrotliReadBits32(br, b->dist_extra_bits[code]); + } else { + if (!SafeReadBits32(br, b->dist_extra_bits[code], &bits)) { + ++s->block_length[2]; + BrotliBitReaderRestoreState(br, &memento); + return BROTLI_FALSE; + } + } + s->distance_code = + (int)(b->dist_offset[code] + (bits << s->distance_postfix_bits)); + return BROTLI_TRUE; +} + +static BROTLI_INLINE void ReadDistance( + BrotliDecoderState* s, BrotliBitReader* br) { + ReadDistanceInternal(0, s, br); +} + +static BROTLI_INLINE BROTLI_BOOL SafeReadDistance( + BrotliDecoderState* s, BrotliBitReader* br) { + return ReadDistanceInternal(1, s, br); +} + +static BROTLI_INLINE BROTLI_BOOL ReadCommandInternal( + int safe, BrotliDecoderState* s, BrotliBitReader* br, int* insert_length) { + brotli_reg_t cmd_code; + brotli_reg_t insert_len_extra = 0; + brotli_reg_t copy_length; + CmdLutElement v; + BrotliBitReaderState memento; + if (!safe) { + cmd_code = ReadSymbol(s->htree_command, br); + } else { + BrotliBitReaderSaveState(br, &memento); + if (!SafeReadSymbol(s->htree_command, br, &cmd_code)) { + return BROTLI_FALSE; + } + } + v = kCmdLut[cmd_code]; + s->distance_code = v.distance_code; + s->distance_context = v.context; + s->dist_htree_index = s->dist_context_map_slice[s->distance_context]; + *insert_length = v.insert_len_offset; + if (!safe) { + if (BROTLI_PREDICT_FALSE(v.insert_len_extra_bits != 0)) { + insert_len_extra = BrotliReadBits24(br, v.insert_len_extra_bits); + } + copy_length = BrotliReadBits24(br, v.copy_len_extra_bits); + } else { + if (!SafeReadBits(br, v.insert_len_extra_bits, &insert_len_extra) || + !SafeReadBits(br, v.copy_len_extra_bits, ©_length)) { + BrotliBitReaderRestoreState(br, &memento); + return BROTLI_FALSE; + } + } + s->copy_length = (int)copy_length + v.copy_len_offset; + --s->block_length[1]; + *insert_length += (int)insert_len_extra; + return BROTLI_TRUE; +} + +static BROTLI_INLINE void ReadCommand( + BrotliDecoderState* s, BrotliBitReader* br, int* insert_length) { + ReadCommandInternal(0, s, br, insert_length); +} + +static BROTLI_INLINE BROTLI_BOOL SafeReadCommand( + BrotliDecoderState* s, BrotliBitReader* br, int* insert_length) { + return ReadCommandInternal(1, s, br, insert_length); +} + +static BROTLI_INLINE BROTLI_BOOL CheckInputAmount( + int safe, BrotliBitReader* const br) { + if (safe) { + return BROTLI_TRUE; + } + return BrotliCheckInputAmount(br); +} + +#define BROTLI_SAFE(METHOD) \ + { \ + if (safe) { \ + if (!Safe##METHOD) { \ + result = BROTLI_DECODER_NEEDS_MORE_INPUT; \ + goto saveStateAndReturn; \ + } \ + } else { \ + METHOD; \ + } \ + } + +static BROTLI_INLINE BrotliDecoderErrorCode ProcessCommandsInternal( + int safe, BrotliDecoderState* s) { + int pos = s->pos; + int i = s->loop_counter; + BrotliDecoderErrorCode result = BROTLI_DECODER_SUCCESS; + BrotliBitReader* br = &s->br; + int compound_dictionary_size = GetCompoundDictionarySize(s); + + if (!CheckInputAmount(safe, br)) { + result = BROTLI_DECODER_NEEDS_MORE_INPUT; + goto saveStateAndReturn; + } + if (!safe) { + BROTLI_UNUSED(BrotliWarmupBitReader(br)); + } + + /* Jump into state machine. */ + if (s->state == BROTLI_STATE_COMMAND_BEGIN) { + goto CommandBegin; + } else if (s->state == BROTLI_STATE_COMMAND_INNER) { + goto CommandInner; + } else if (s->state == BROTLI_STATE_COMMAND_POST_DECODE_LITERALS) { + goto CommandPostDecodeLiterals; + } else if (s->state == BROTLI_STATE_COMMAND_POST_WRAP_COPY) { + goto CommandPostWrapCopy; + } else { + return BROTLI_FAILURE(BROTLI_DECODER_ERROR_UNREACHABLE); /* COV_NF_LINE */ + } + +CommandBegin: + if (safe) { + s->state = BROTLI_STATE_COMMAND_BEGIN; + } + if (!CheckInputAmount(safe, br)) { + s->state = BROTLI_STATE_COMMAND_BEGIN; + result = BROTLI_DECODER_NEEDS_MORE_INPUT; + goto saveStateAndReturn; + } + if (BROTLI_PREDICT_FALSE(s->block_length[1] == 0)) { + BROTLI_SAFE(DecodeCommandBlockSwitch(s)); + goto CommandBegin; + } + /* Read the insert/copy length in the command. */ + BROTLI_SAFE(ReadCommand(s, br, &i)); + BROTLI_LOG(("[ProcessCommandsInternal] pos = %d insert = %d copy = %d\n", + pos, i, s->copy_length)); + if (i == 0) { + goto CommandPostDecodeLiterals; + } + s->meta_block_remaining_len -= i; + +CommandInner: + if (safe) { + s->state = BROTLI_STATE_COMMAND_INNER; + } + /* Read the literals in the command. */ + if (s->trivial_literal_context) { + brotli_reg_t bits; + brotli_reg_t value; + PreloadSymbol(safe, s->literal_htree, br, &bits, &value); + do { + if (!CheckInputAmount(safe, br)) { + s->state = BROTLI_STATE_COMMAND_INNER; + result = BROTLI_DECODER_NEEDS_MORE_INPUT; + goto saveStateAndReturn; + } + if (BROTLI_PREDICT_FALSE(s->block_length[0] == 0)) { + goto NextLiteralBlock; + } + if (!safe) { + s->ringbuffer[pos] = + (uint8_t)ReadPreloadedSymbol(s->literal_htree, br, &bits, &value); + } else { + brotli_reg_t literal; + if (!SafeReadSymbol(s->literal_htree, br, &literal)) { + result = BROTLI_DECODER_NEEDS_MORE_INPUT; + goto saveStateAndReturn; + } + s->ringbuffer[pos] = (uint8_t)literal; + } + --s->block_length[0]; + BROTLI_LOG_ARRAY_INDEX(s->ringbuffer, pos); + ++pos; + if (BROTLI_PREDICT_FALSE(pos == s->ringbuffer_size)) { + s->state = BROTLI_STATE_COMMAND_INNER_WRITE; + --i; + goto saveStateAndReturn; + } + } while (--i != 0); + } else { + uint8_t p1 = s->ringbuffer[(pos - 1) & s->ringbuffer_mask]; + uint8_t p2 = s->ringbuffer[(pos - 2) & s->ringbuffer_mask]; + do { + const HuffmanCode* hc; + uint8_t context; + if (!CheckInputAmount(safe, br)) { + s->state = BROTLI_STATE_COMMAND_INNER; + result = BROTLI_DECODER_NEEDS_MORE_INPUT; + goto saveStateAndReturn; + } + if (BROTLI_PREDICT_FALSE(s->block_length[0] == 0)) { + goto NextLiteralBlock; + } + context = BROTLI_CONTEXT(p1, p2, s->context_lookup); + BROTLI_LOG_UINT(context); + hc = s->literal_hgroup.htrees[s->context_map_slice[context]]; + p2 = p1; + if (!safe) { + p1 = (uint8_t)ReadSymbol(hc, br); + } else { + brotli_reg_t literal; + if (!SafeReadSymbol(hc, br, &literal)) { + result = BROTLI_DECODER_NEEDS_MORE_INPUT; + goto saveStateAndReturn; + } + p1 = (uint8_t)literal; + } + s->ringbuffer[pos] = p1; + --s->block_length[0]; + BROTLI_LOG_UINT(s->context_map_slice[context]); + BROTLI_LOG_ARRAY_INDEX(s->ringbuffer, pos & s->ringbuffer_mask); + ++pos; + if (BROTLI_PREDICT_FALSE(pos == s->ringbuffer_size)) { + s->state = BROTLI_STATE_COMMAND_INNER_WRITE; + --i; + goto saveStateAndReturn; + } + } while (--i != 0); + } + BROTLI_LOG_UINT(s->meta_block_remaining_len); + if (BROTLI_PREDICT_FALSE(s->meta_block_remaining_len <= 0)) { + s->state = BROTLI_STATE_METABLOCK_DONE; + goto saveStateAndReturn; + } + +CommandPostDecodeLiterals: + if (safe) { + s->state = BROTLI_STATE_COMMAND_POST_DECODE_LITERALS; + } + if (s->distance_code >= 0) { + /* Implicit distance case. */ + s->distance_context = s->distance_code ? 0 : 1; + --s->dist_rb_idx; + s->distance_code = s->dist_rb[s->dist_rb_idx & 3]; + } else { + /* Read distance code in the command, unless it was implicitly zero. */ + if (BROTLI_PREDICT_FALSE(s->block_length[2] == 0)) { + BROTLI_SAFE(DecodeDistanceBlockSwitch(s)); + } + BROTLI_SAFE(ReadDistance(s, br)); + } + BROTLI_LOG(("[ProcessCommandsInternal] pos = %d distance = %d\n", + pos, s->distance_code)); + if (s->max_distance != s->max_backward_distance) { + s->max_distance = + (pos < s->max_backward_distance) ? pos : s->max_backward_distance; + } + i = s->copy_length; + /* Apply copy of LZ77 back-reference, or static dictionary reference if + the distance is larger than the max LZ77 distance */ + if (s->distance_code > s->max_distance) { + /* The maximum allowed distance is BROTLI_MAX_ALLOWED_DISTANCE = 0x7FFFFFFC. + With this choice, no signed overflow can occur after decoding + a special distance code (e.g., after adding 3 to the last distance). */ + if (s->distance_code > BROTLI_MAX_ALLOWED_DISTANCE) { + BROTLI_LOG(("Invalid backward reference. pos: %d distance: %d " + "len: %d bytes left: %d\n", + pos, s->distance_code, i, s->meta_block_remaining_len)); + return BROTLI_FAILURE(BROTLI_DECODER_ERROR_FORMAT_DISTANCE); + } + if (s->distance_code - s->max_distance - 1 < compound_dictionary_size) { + int address = compound_dictionary_size - + (s->distance_code - s->max_distance); + if (!InitializeCompoundDictionaryCopy(s, address, i)) { + return BROTLI_FAILURE(BROTLI_DECODER_ERROR_COMPOUND_DICTIONARY); + } + pos += CopyFromCompoundDictionary(s, pos); + if (pos >= s->ringbuffer_size) { + s->state = BROTLI_STATE_COMMAND_POST_WRITE_1; + goto saveStateAndReturn; + } + } else if (i >= SHARED_BROTLI_MIN_DICTIONARY_WORD_LENGTH && + i <= SHARED_BROTLI_MAX_DICTIONARY_WORD_LENGTH) { + uint8_t p1 = s->ringbuffer[(pos - 1) & s->ringbuffer_mask]; + uint8_t p2 = s->ringbuffer[(pos - 2) & s->ringbuffer_mask]; + uint8_t dict_id = s->dictionary->context_based ? + s->dictionary->context_map[BROTLI_CONTEXT(p1, p2, s->context_lookup)] + : 0; + const BrotliDictionary* words = s->dictionary->words[dict_id]; + const BrotliTransforms* transforms = s->dictionary->transforms[dict_id]; + int offset = (int)words->offsets_by_length[i]; + brotli_reg_t shift = words->size_bits_by_length[i]; + int address = + s->distance_code - s->max_distance - 1 - compound_dictionary_size; + int mask = (int)BitMask(shift); + int word_idx = address & mask; + int transform_idx = address >> shift; + /* Compensate double distance-ring-buffer roll. */ + s->dist_rb_idx += s->distance_context; + offset += word_idx * i; + /* If the distance is out of bound, select a next static dictionary if + there exist multiple. */ + if ((transform_idx >= (int)transforms->num_transforms || + words->size_bits_by_length[i] == 0) && + s->dictionary->num_dictionaries > 1) { + uint8_t dict_id2; + int dist_remaining = address - + (int)(((1u << shift) & ~1u)) * (int)transforms->num_transforms; + for (dict_id2 = 0; dict_id2 < s->dictionary->num_dictionaries; + dict_id2++) { + const BrotliDictionary* words2 = s->dictionary->words[dict_id2]; + if (dict_id2 != dict_id && words2->size_bits_by_length[i] != 0) { + const BrotliTransforms* transforms2 = + s->dictionary->transforms[dict_id2]; + brotli_reg_t shift2 = words2->size_bits_by_length[i]; + int num = (int)((1u << shift2) & ~1u) * + (int)transforms2->num_transforms; + if (dist_remaining < num) { + dict_id = dict_id2; + words = words2; + transforms = transforms2; + address = dist_remaining; + shift = shift2; + mask = (int)BitMask(shift); + word_idx = address & mask; + transform_idx = address >> shift; + offset = (int)words->offsets_by_length[i] + word_idx * i; + break; + } + dist_remaining -= num; + } + } + } + if (BROTLI_PREDICT_FALSE(words->size_bits_by_length[i] == 0)) { + BROTLI_LOG(("Invalid backward reference. pos: %d distance: %d " + "len: %d bytes left: %d\n", + pos, s->distance_code, i, s->meta_block_remaining_len)); + return BROTLI_FAILURE(BROTLI_DECODER_ERROR_FORMAT_DICTIONARY); + } + if (BROTLI_PREDICT_FALSE(!words->data)) { + return BROTLI_FAILURE(BROTLI_DECODER_ERROR_DICTIONARY_NOT_SET); + } + if (transform_idx < (int)transforms->num_transforms) { + const uint8_t* word = &words->data[offset]; + int len = i; + if (transform_idx == transforms->cutOffTransforms[0]) { + memcpy(&s->ringbuffer[pos], word, (size_t)len); + BROTLI_LOG(("[ProcessCommandsInternal] dictionary word: [%.*s]\n", + len, word)); + } else { + len = BrotliTransformDictionaryWord(&s->ringbuffer[pos], word, len, + transforms, transform_idx); + BROTLI_LOG(("[ProcessCommandsInternal] dictionary word: [%.*s]," + " transform_idx = %d, transformed: [%.*s]\n", + i, word, transform_idx, len, &s->ringbuffer[pos])); + if (len == 0 && s->distance_code <= 120) { + BROTLI_LOG(("Invalid length-0 dictionary word after transform\n")); + return BROTLI_FAILURE(BROTLI_DECODER_ERROR_FORMAT_TRANSFORM); + } + } + pos += len; + s->meta_block_remaining_len -= len; + if (pos >= s->ringbuffer_size) { + s->state = BROTLI_STATE_COMMAND_POST_WRITE_1; + goto saveStateAndReturn; + } + } else { + BROTLI_LOG(("Invalid backward reference. pos: %d distance: %d " + "len: %d bytes left: %d\n", + pos, s->distance_code, i, s->meta_block_remaining_len)); + return BROTLI_FAILURE(BROTLI_DECODER_ERROR_FORMAT_TRANSFORM); + } + } else { + BROTLI_LOG(("Invalid backward reference. pos: %d distance: %d " + "len: %d bytes left: %d\n", + pos, s->distance_code, i, s->meta_block_remaining_len)); + return BROTLI_FAILURE(BROTLI_DECODER_ERROR_FORMAT_DICTIONARY); + } + } else { + int src_start = (pos - s->distance_code) & s->ringbuffer_mask; + uint8_t* copy_dst = &s->ringbuffer[pos]; + uint8_t* copy_src = &s->ringbuffer[src_start]; + int dst_end = pos + i; + int src_end = src_start + i; + /* Update the recent distances cache. */ + s->dist_rb[s->dist_rb_idx & 3] = s->distance_code; + ++s->dist_rb_idx; + s->meta_block_remaining_len -= i; + /* There are 32+ bytes of slack in the ring-buffer allocation. + Also, we have 16 short codes, that make these 16 bytes irrelevant + in the ring-buffer. Let's copy over them as a first guess. */ + memmove16(copy_dst, copy_src); + if (src_end > pos && dst_end > src_start) { + /* Regions intersect. */ + goto CommandPostWrapCopy; + } + if (dst_end >= s->ringbuffer_size || src_end >= s->ringbuffer_size) { + /* At least one region wraps. */ + goto CommandPostWrapCopy; + } + pos += i; + if (i > 16) { + if (i > 32) { + memcpy(copy_dst + 16, copy_src + 16, (size_t)(i - 16)); + } else { + /* This branch covers about 45% cases. + Fixed size short copy allows more compiler optimizations. */ + memmove16(copy_dst + 16, copy_src + 16); + } + } + } + BROTLI_LOG_UINT(s->meta_block_remaining_len); + if (s->meta_block_remaining_len <= 0) { + /* Next metablock, if any. */ + s->state = BROTLI_STATE_METABLOCK_DONE; + goto saveStateAndReturn; + } else { + goto CommandBegin; + } +CommandPostWrapCopy: + { + int wrap_guard = s->ringbuffer_size - pos; + while (--i >= 0) { + s->ringbuffer[pos] = + s->ringbuffer[(pos - s->distance_code) & s->ringbuffer_mask]; + ++pos; + if (BROTLI_PREDICT_FALSE(--wrap_guard == 0)) { + s->state = BROTLI_STATE_COMMAND_POST_WRITE_2; + goto saveStateAndReturn; + } + } + } + if (s->meta_block_remaining_len <= 0) { + /* Next metablock, if any. */ + s->state = BROTLI_STATE_METABLOCK_DONE; + goto saveStateAndReturn; + } else { + goto CommandBegin; + } + +NextLiteralBlock: + BROTLI_SAFE(DecodeLiteralBlockSwitch(s)); + goto CommandInner; + +saveStateAndReturn: + s->pos = pos; + s->loop_counter = i; + return result; +} + +#undef BROTLI_SAFE + +static BROTLI_NOINLINE BrotliDecoderErrorCode ProcessCommands( + BrotliDecoderState* s) { + return ProcessCommandsInternal(0, s); +} + +static BROTLI_NOINLINE BrotliDecoderErrorCode SafeProcessCommands( + BrotliDecoderState* s) { + return ProcessCommandsInternal(1, s); +} + +BrotliDecoderResult BrotliDecoderDecompress( + size_t encoded_size, + const uint8_t encoded_buffer[BROTLI_ARRAY_PARAM(encoded_size)], + size_t* decoded_size, + uint8_t decoded_buffer[BROTLI_ARRAY_PARAM(*decoded_size)]) { + BrotliDecoderState s; + BrotliDecoderResult result; + size_t total_out = 0; + size_t available_in = encoded_size; + const uint8_t* next_in = encoded_buffer; + size_t available_out = *decoded_size; + uint8_t* next_out = decoded_buffer; + if (!BrotliDecoderStateInit(&s, 0, 0, 0)) { + return BROTLI_DECODER_RESULT_ERROR; + } + result = BrotliDecoderDecompressStream( + &s, &available_in, &next_in, &available_out, &next_out, &total_out); + *decoded_size = total_out; + BrotliDecoderStateCleanup(&s); + if (result != BROTLI_DECODER_RESULT_SUCCESS) { + result = BROTLI_DECODER_RESULT_ERROR; + } + return result; +} + +/* Invariant: input stream is never overconsumed: + - invalid input implies that the whole stream is invalid -> any amount of + input could be read and discarded + - when result is "needs more input", then at least one more byte is REQUIRED + to complete decoding; all input data MUST be consumed by decoder, so + client could swap the input buffer + - when result is "needs more output" decoder MUST ensure that it doesn't + hold more than 7 bits in bit reader; this saves client from swapping input + buffer ahead of time + - when result is "success" decoder MUST return all unused data back to input + buffer; this is possible because the invariant is held on enter */ +BrotliDecoderResult BrotliDecoderDecompressStream( + BrotliDecoderState* s, size_t* available_in, const uint8_t** next_in, + size_t* available_out, uint8_t** next_out, size_t* total_out) { + BrotliDecoderErrorCode result = BROTLI_DECODER_SUCCESS; + BrotliBitReader* br = &s->br; + size_t input_size = *available_in; +#define BROTLI_SAVE_ERROR_CODE(code) \ + SaveErrorCode(s, (code), input_size - *available_in) + /* Ensure that |total_out| is set, even if no data will ever be pushed out. */ + if (total_out) { + *total_out = s->partial_pos_out; + } + /* Do not try to process further in a case of unrecoverable error. */ + if ((int)s->error_code < 0) { + return BROTLI_DECODER_RESULT_ERROR; + } + if (*available_out && (!next_out || !*next_out)) { + return BROTLI_SAVE_ERROR_CODE( + BROTLI_FAILURE(BROTLI_DECODER_ERROR_INVALID_ARGUMENTS)); + } + if (!*available_out) next_out = 0; + if (s->buffer_length == 0) { /* Just connect bit reader to input stream. */ + BrotliBitReaderSetInput(br, *next_in, *available_in); + } else { + /* At least one byte of input is required. More than one byte of input may + be required to complete the transaction -> reading more data must be + done in a loop -> do it in a main loop. */ + result = BROTLI_DECODER_NEEDS_MORE_INPUT; + BrotliBitReaderSetInput(br, &s->buffer.u8[0], s->buffer_length); + } + /* State machine */ + for (;;) { + if (result != BROTLI_DECODER_SUCCESS) { + /* Error, needs more input/output. */ + if (result == BROTLI_DECODER_NEEDS_MORE_INPUT) { + if (s->ringbuffer != 0) { /* Pro-actively push output. */ + BrotliDecoderErrorCode intermediate_result = WriteRingBuffer(s, + available_out, next_out, total_out, BROTLI_TRUE); + /* WriteRingBuffer checks s->meta_block_remaining_len validity. */ + if ((int)intermediate_result < 0) { + result = intermediate_result; + break; + } + } + if (s->buffer_length != 0) { /* Used with internal buffer. */ + if (br->next_in == br->last_in) { + /* Successfully finished read transaction. + Accumulator contains less than 8 bits, because internal buffer + is expanded byte-by-byte until it is enough to complete read. */ + s->buffer_length = 0; + /* Switch to input stream and restart. */ + result = BROTLI_DECODER_SUCCESS; + BrotliBitReaderSetInput(br, *next_in, *available_in); + continue; + } else if (*available_in != 0) { + /* Not enough data in buffer, but can take one more byte from + input stream. */ + result = BROTLI_DECODER_SUCCESS; + BROTLI_DCHECK(s->buffer_length < 8); + s->buffer.u8[s->buffer_length] = **next_in; + s->buffer_length++; + BrotliBitReaderSetInput(br, &s->buffer.u8[0], s->buffer_length); + (*next_in)++; + (*available_in)--; + /* Retry with more data in buffer. */ + continue; + } + /* Can't finish reading and no more input. */ + break; + } else { /* Input stream doesn't contain enough input. */ + /* Copy tail to internal buffer and return. */ + *next_in = br->next_in; + *available_in = BrotliBitReaderGetAvailIn(br); + while (*available_in) { + s->buffer.u8[s->buffer_length] = **next_in; + s->buffer_length++; + (*next_in)++; + (*available_in)--; + } + break; + } + /* Unreachable. */ + } + + /* Fail or needs more output. */ + + if (s->buffer_length != 0) { + /* Just consumed the buffered input and produced some output. Otherwise + it would result in "needs more input". Reset internal buffer. */ + s->buffer_length = 0; + } else { + /* Using input stream in last iteration. When decoder switches to input + stream it has less than 8 bits in accumulator, so it is safe to + return unused accumulator bits there. */ + BrotliBitReaderUnload(br); + *available_in = BrotliBitReaderGetAvailIn(br); + *next_in = br->next_in; + } + break; + } + switch (s->state) { + case BROTLI_STATE_UNINITED: + /* Prepare to the first read. */ + if (!BrotliWarmupBitReader(br)) { + result = BROTLI_DECODER_NEEDS_MORE_INPUT; + break; + } + /* Decode window size. */ + result = DecodeWindowBits(s, br); /* Reads 1..8 bits. */ + if (result != BROTLI_DECODER_SUCCESS) { + break; + } + if (s->large_window) { + s->state = BROTLI_STATE_LARGE_WINDOW_BITS; + break; + } + s->state = BROTLI_STATE_INITIALIZE; + break; + + case BROTLI_STATE_LARGE_WINDOW_BITS: { + brotli_reg_t bits; + if (!BrotliSafeReadBits(br, 6, &bits)) { + result = BROTLI_DECODER_NEEDS_MORE_INPUT; + break; + } + s->window_bits = bits & 63u; + if (s->window_bits < BROTLI_LARGE_MIN_WBITS || + s->window_bits > BROTLI_LARGE_MAX_WBITS) { + result = BROTLI_FAILURE(BROTLI_DECODER_ERROR_FORMAT_WINDOW_BITS); + break; + } + s->state = BROTLI_STATE_INITIALIZE; + } + /* Fall through. */ + + case BROTLI_STATE_INITIALIZE: + BROTLI_LOG_UINT(s->window_bits); + /* Maximum distance, see section 9.1. of the spec. */ + s->max_backward_distance = (1 << s->window_bits) - BROTLI_WINDOW_GAP; + + /* Allocate memory for both block_type_trees and block_len_trees. */ + s->block_type_trees = (HuffmanCode*)BROTLI_DECODER_ALLOC(s, + sizeof(HuffmanCode) * 3 * + (BROTLI_HUFFMAN_MAX_SIZE_258 + BROTLI_HUFFMAN_MAX_SIZE_26)); + if (s->block_type_trees == 0) { + result = BROTLI_FAILURE(BROTLI_DECODER_ERROR_ALLOC_BLOCK_TYPE_TREES); + break; + } + s->block_len_trees = + s->block_type_trees + 3 * BROTLI_HUFFMAN_MAX_SIZE_258; + + s->state = BROTLI_STATE_METABLOCK_BEGIN; + /* Fall through. */ + + case BROTLI_STATE_METABLOCK_BEGIN: + BrotliDecoderStateMetablockBegin(s); + BROTLI_LOG_UINT(s->pos); + s->state = BROTLI_STATE_METABLOCK_HEADER; + /* Fall through. */ + + case BROTLI_STATE_METABLOCK_HEADER: + result = DecodeMetaBlockLength(s, br); /* Reads 2 - 31 bits. */ + if (result != BROTLI_DECODER_SUCCESS) { + break; + } + BROTLI_LOG_UINT(s->is_last_metablock); + BROTLI_LOG_UINT(s->meta_block_remaining_len); + BROTLI_LOG_UINT(s->is_metadata); + BROTLI_LOG_UINT(s->is_uncompressed); + if (s->is_metadata || s->is_uncompressed) { + if (!BrotliJumpToByteBoundary(br)) { + result = BROTLI_FAILURE(BROTLI_DECODER_ERROR_FORMAT_PADDING_1); + break; + } + } + if (s->is_metadata) { + s->state = BROTLI_STATE_METADATA; + if (s->metadata_start_func) { + s->metadata_start_func(s->metadata_callback_opaque, + (size_t)s->meta_block_remaining_len); + } + break; + } + if (s->meta_block_remaining_len == 0) { + s->state = BROTLI_STATE_METABLOCK_DONE; + break; + } + BrotliCalculateRingBufferSize(s); + if (s->is_uncompressed) { + s->state = BROTLI_STATE_UNCOMPRESSED; + break; + } + s->state = BROTLI_STATE_BEFORE_COMPRESSED_METABLOCK_HEADER; + /* Fall through. */ + + case BROTLI_STATE_BEFORE_COMPRESSED_METABLOCK_HEADER: { + BrotliMetablockHeaderArena* h = &s->arena.header; + s->loop_counter = 0; + /* Initialize compressed metablock header arena. */ + h->sub_loop_counter = 0; + /* Make small negative indexes addressable. */ + h->symbol_lists = + &h->symbols_lists_array[BROTLI_HUFFMAN_MAX_CODE_LENGTH + 1]; + h->substate_huffman = BROTLI_STATE_HUFFMAN_NONE; + h->substate_tree_group = BROTLI_STATE_TREE_GROUP_NONE; + h->substate_context_map = BROTLI_STATE_CONTEXT_MAP_NONE; + s->state = BROTLI_STATE_HUFFMAN_CODE_0; + } + /* Fall through. */ + + case BROTLI_STATE_HUFFMAN_CODE_0: + if (s->loop_counter >= 3) { + s->state = BROTLI_STATE_METABLOCK_HEADER_2; + break; + } + /* Reads 1..11 bits. */ + result = DecodeVarLenUint8(s, br, &s->num_block_types[s->loop_counter]); + if (result != BROTLI_DECODER_SUCCESS) { + break; + } + s->num_block_types[s->loop_counter]++; + BROTLI_LOG_UINT(s->num_block_types[s->loop_counter]); + if (s->num_block_types[s->loop_counter] < 2) { + s->loop_counter++; + break; + } + s->state = BROTLI_STATE_HUFFMAN_CODE_1; + /* Fall through. */ + + case BROTLI_STATE_HUFFMAN_CODE_1: { + brotli_reg_t alphabet_size = s->num_block_types[s->loop_counter] + 2; + int tree_offset = s->loop_counter * BROTLI_HUFFMAN_MAX_SIZE_258; + result = ReadHuffmanCode(alphabet_size, alphabet_size, + &s->block_type_trees[tree_offset], NULL, s); + if (result != BROTLI_DECODER_SUCCESS) break; + s->state = BROTLI_STATE_HUFFMAN_CODE_2; + } + /* Fall through. */ + + case BROTLI_STATE_HUFFMAN_CODE_2: { + brotli_reg_t alphabet_size = BROTLI_NUM_BLOCK_LEN_SYMBOLS; + int tree_offset = s->loop_counter * BROTLI_HUFFMAN_MAX_SIZE_26; + result = ReadHuffmanCode(alphabet_size, alphabet_size, + &s->block_len_trees[tree_offset], NULL, s); + if (result != BROTLI_DECODER_SUCCESS) break; + s->state = BROTLI_STATE_HUFFMAN_CODE_3; + } + /* Fall through. */ + + case BROTLI_STATE_HUFFMAN_CODE_3: { + int tree_offset = s->loop_counter * BROTLI_HUFFMAN_MAX_SIZE_26; + if (!SafeReadBlockLength(s, &s->block_length[s->loop_counter], + &s->block_len_trees[tree_offset], br)) { + result = BROTLI_DECODER_NEEDS_MORE_INPUT; + break; + } + BROTLI_LOG_UINT(s->block_length[s->loop_counter]); + s->loop_counter++; + s->state = BROTLI_STATE_HUFFMAN_CODE_0; + break; + } + + case BROTLI_STATE_UNCOMPRESSED: { + result = CopyUncompressedBlockToOutput( + available_out, next_out, total_out, s); + if (result != BROTLI_DECODER_SUCCESS) { + break; + } + s->state = BROTLI_STATE_METABLOCK_DONE; + break; + } + + case BROTLI_STATE_METADATA: + result = SkipMetadataBlock(s); + if (result != BROTLI_DECODER_SUCCESS) { + break; + } + s->state = BROTLI_STATE_METABLOCK_DONE; + break; + + case BROTLI_STATE_METABLOCK_HEADER_2: { + brotli_reg_t bits; + if (!BrotliSafeReadBits(br, 6, &bits)) { + result = BROTLI_DECODER_NEEDS_MORE_INPUT; + break; + } + s->distance_postfix_bits = bits & BitMask(2); + bits >>= 2; + s->num_direct_distance_codes = bits << s->distance_postfix_bits; + BROTLI_LOG_UINT(s->num_direct_distance_codes); + BROTLI_LOG_UINT(s->distance_postfix_bits); + s->context_modes = + (uint8_t*)BROTLI_DECODER_ALLOC(s, (size_t)s->num_block_types[0]); + if (s->context_modes == 0) { + result = BROTLI_FAILURE(BROTLI_DECODER_ERROR_ALLOC_CONTEXT_MODES); + break; + } + s->loop_counter = 0; + s->state = BROTLI_STATE_CONTEXT_MODES; + } + /* Fall through. */ + + case BROTLI_STATE_CONTEXT_MODES: + result = ReadContextModes(s); + if (result != BROTLI_DECODER_SUCCESS) { + break; + } + s->state = BROTLI_STATE_CONTEXT_MAP_1; + /* Fall through. */ + + case BROTLI_STATE_CONTEXT_MAP_1: + result = DecodeContextMap( + s->num_block_types[0] << BROTLI_LITERAL_CONTEXT_BITS, + &s->num_literal_htrees, &s->context_map, s); + if (result != BROTLI_DECODER_SUCCESS) { + break; + } + DetectTrivialLiteralBlockTypes(s); + s->state = BROTLI_STATE_CONTEXT_MAP_2; + /* Fall through. */ + + case BROTLI_STATE_CONTEXT_MAP_2: { + brotli_reg_t npostfix = s->distance_postfix_bits; + brotli_reg_t ndirect = s->num_direct_distance_codes; + brotli_reg_t distance_alphabet_size_max = BROTLI_DISTANCE_ALPHABET_SIZE( + npostfix, ndirect, BROTLI_MAX_DISTANCE_BITS); + brotli_reg_t distance_alphabet_size_limit = distance_alphabet_size_max; + BROTLI_BOOL allocation_success = BROTLI_TRUE; + if (s->large_window) { + BrotliDistanceCodeLimit limit = BrotliCalculateDistanceCodeLimit( + BROTLI_MAX_ALLOWED_DISTANCE, (uint32_t)npostfix, + (uint32_t)ndirect); + distance_alphabet_size_max = BROTLI_DISTANCE_ALPHABET_SIZE( + npostfix, ndirect, BROTLI_LARGE_MAX_DISTANCE_BITS); + distance_alphabet_size_limit = limit.max_alphabet_size; + } + result = DecodeContextMap( + s->num_block_types[2] << BROTLI_DISTANCE_CONTEXT_BITS, + &s->num_dist_htrees, &s->dist_context_map, s); + if (result != BROTLI_DECODER_SUCCESS) { + break; + } + allocation_success &= BrotliDecoderHuffmanTreeGroupInit( + s, &s->literal_hgroup, BROTLI_NUM_LITERAL_SYMBOLS, + BROTLI_NUM_LITERAL_SYMBOLS, s->num_literal_htrees); + allocation_success &= BrotliDecoderHuffmanTreeGroupInit( + s, &s->insert_copy_hgroup, BROTLI_NUM_COMMAND_SYMBOLS, + BROTLI_NUM_COMMAND_SYMBOLS, s->num_block_types[1]); + allocation_success &= BrotliDecoderHuffmanTreeGroupInit( + s, &s->distance_hgroup, distance_alphabet_size_max, + distance_alphabet_size_limit, s->num_dist_htrees); + if (!allocation_success) { + return BROTLI_SAVE_ERROR_CODE( + BROTLI_FAILURE(BROTLI_DECODER_ERROR_ALLOC_TREE_GROUPS)); + } + s->loop_counter = 0; + s->state = BROTLI_STATE_TREE_GROUP; + } + /* Fall through. */ + + case BROTLI_STATE_TREE_GROUP: { + HuffmanTreeGroup* hgroup = NULL; + switch (s->loop_counter) { + case 0: hgroup = &s->literal_hgroup; break; + case 1: hgroup = &s->insert_copy_hgroup; break; + case 2: hgroup = &s->distance_hgroup; break; + default: return BROTLI_SAVE_ERROR_CODE(BROTLI_FAILURE( + BROTLI_DECODER_ERROR_UNREACHABLE)); /* COV_NF_LINE */ + } + result = HuffmanTreeGroupDecode(hgroup, s); + if (result != BROTLI_DECODER_SUCCESS) break; + s->loop_counter++; + if (s->loop_counter < 3) { + break; + } + s->state = BROTLI_STATE_BEFORE_COMPRESSED_METABLOCK_BODY; + } + /* Fall through. */ + + case BROTLI_STATE_BEFORE_COMPRESSED_METABLOCK_BODY: + PrepareLiteralDecoding(s); + s->dist_context_map_slice = s->dist_context_map; + s->htree_command = s->insert_copy_hgroup.htrees[0]; + if (!BrotliEnsureRingBuffer(s)) { + result = BROTLI_FAILURE(BROTLI_DECODER_ERROR_ALLOC_RING_BUFFER_2); + break; + } + CalculateDistanceLut(s); + s->state = BROTLI_STATE_COMMAND_BEGIN; + /* Fall through. */ + + case BROTLI_STATE_COMMAND_BEGIN: + /* Fall through. */ + case BROTLI_STATE_COMMAND_INNER: + /* Fall through. */ + case BROTLI_STATE_COMMAND_POST_DECODE_LITERALS: + /* Fall through. */ + case BROTLI_STATE_COMMAND_POST_WRAP_COPY: + result = ProcessCommands(s); + if (result == BROTLI_DECODER_NEEDS_MORE_INPUT) { + result = SafeProcessCommands(s); + } + break; + + case BROTLI_STATE_COMMAND_INNER_WRITE: + /* Fall through. */ + case BROTLI_STATE_COMMAND_POST_WRITE_1: + /* Fall through. */ + case BROTLI_STATE_COMMAND_POST_WRITE_2: + result = WriteRingBuffer( + s, available_out, next_out, total_out, BROTLI_FALSE); + if (result != BROTLI_DECODER_SUCCESS) { + break; + } + WrapRingBuffer(s); + if (s->ringbuffer_size == 1 << s->window_bits) { + s->max_distance = s->max_backward_distance; + } + if (s->state == BROTLI_STATE_COMMAND_POST_WRITE_1) { + BrotliDecoderCompoundDictionary* addon = s->compound_dictionary; + if (addon && (addon->br_length != addon->br_copied)) { + s->pos += CopyFromCompoundDictionary(s, s->pos); + if (s->pos >= s->ringbuffer_size) continue; + } + if (s->meta_block_remaining_len == 0) { + /* Next metablock, if any. */ + s->state = BROTLI_STATE_METABLOCK_DONE; + } else { + s->state = BROTLI_STATE_COMMAND_BEGIN; + } + break; + } else if (s->state == BROTLI_STATE_COMMAND_POST_WRITE_2) { + s->state = BROTLI_STATE_COMMAND_POST_WRAP_COPY; + } else { /* BROTLI_STATE_COMMAND_INNER_WRITE */ + if (s->loop_counter == 0) { + if (s->meta_block_remaining_len == 0) { + s->state = BROTLI_STATE_METABLOCK_DONE; + } else { + s->state = BROTLI_STATE_COMMAND_POST_DECODE_LITERALS; + } + break; + } + s->state = BROTLI_STATE_COMMAND_INNER; + } + break; + + case BROTLI_STATE_METABLOCK_DONE: + if (s->meta_block_remaining_len < 0) { + result = BROTLI_FAILURE(BROTLI_DECODER_ERROR_FORMAT_BLOCK_LENGTH_2); + break; + } + BrotliDecoderStateCleanupAfterMetablock(s); + if (!s->is_last_metablock) { + s->state = BROTLI_STATE_METABLOCK_BEGIN; + break; + } + if (!BrotliJumpToByteBoundary(br)) { + result = BROTLI_FAILURE(BROTLI_DECODER_ERROR_FORMAT_PADDING_2); + break; + } + if (s->buffer_length == 0) { + BrotliBitReaderUnload(br); + *available_in = BrotliBitReaderGetAvailIn(br); + *next_in = br->next_in; + } + s->state = BROTLI_STATE_DONE; + /* Fall through. */ + + case BROTLI_STATE_DONE: + if (s->ringbuffer != 0) { + result = WriteRingBuffer( + s, available_out, next_out, total_out, BROTLI_TRUE); + if (result != BROTLI_DECODER_SUCCESS) { + break; + } + } + return BROTLI_SAVE_ERROR_CODE(result); + } + } + return BROTLI_SAVE_ERROR_CODE(result); +#undef BROTLI_SAVE_ERROR_CODE +} + +BROTLI_BOOL BrotliDecoderHasMoreOutput(const BrotliDecoderState* s) { + /* After unrecoverable error remaining output is considered nonsensical. */ + if ((int)s->error_code < 0) { + return BROTLI_FALSE; + } + return TO_BROTLI_BOOL( + s->ringbuffer != 0 && UnwrittenBytes(s, BROTLI_FALSE) != 0); +} + +const uint8_t* BrotliDecoderTakeOutput(BrotliDecoderState* s, size_t* size) { + uint8_t* result = 0; + size_t available_out = *size ? *size : 1u << 24; + size_t requested_out = available_out; + BrotliDecoderErrorCode status; + if ((s->ringbuffer == 0) || ((int)s->error_code < 0)) { + *size = 0; + return 0; + } + WrapRingBuffer(s); + status = WriteRingBuffer(s, &available_out, &result, 0, BROTLI_TRUE); + /* Either WriteRingBuffer returns those "success" codes... */ + if (status == BROTLI_DECODER_SUCCESS || + status == BROTLI_DECODER_NEEDS_MORE_OUTPUT) { + *size = requested_out - available_out; + } else { + /* ... or stream is broken. Normally this should be caught by + BrotliDecoderDecompressStream, this is just a safeguard. */ + if ((int)status < 0) SaveErrorCode(s, status, 0); + *size = 0; + result = 0; + } + return result; +} + +BROTLI_BOOL BrotliDecoderIsUsed(const BrotliDecoderState* s) { + return TO_BROTLI_BOOL(s->state != BROTLI_STATE_UNINITED || + BrotliGetAvailableBits(&s->br) != 0); +} + +BROTLI_BOOL BrotliDecoderIsFinished(const BrotliDecoderState* s) { + return TO_BROTLI_BOOL(s->state == BROTLI_STATE_DONE) && + !BrotliDecoderHasMoreOutput(s); +} + +BrotliDecoderErrorCode BrotliDecoderGetErrorCode(const BrotliDecoderState* s) { + return (BrotliDecoderErrorCode)s->error_code; +} + +const char* BrotliDecoderErrorString(BrotliDecoderErrorCode c) { + switch (c) { +#define BROTLI_ERROR_CODE_CASE_(PREFIX, NAME, CODE) \ + case BROTLI_DECODER ## PREFIX ## NAME: return #PREFIX #NAME; +#define BROTLI_NOTHING_ + BROTLI_DECODER_ERROR_CODES_LIST(BROTLI_ERROR_CODE_CASE_, BROTLI_NOTHING_) +#undef BROTLI_ERROR_CODE_CASE_ +#undef BROTLI_NOTHING_ + default: return "INVALID"; + } +} + +uint32_t BrotliDecoderVersion(void) { + return BROTLI_VERSION; +} + +void BrotliDecoderSetMetadataCallbacks( + BrotliDecoderState* state, + brotli_decoder_metadata_start_func start_func, + brotli_decoder_metadata_chunk_func chunk_func, void* opaque) { + state->metadata_start_func = start_func; + state->metadata_chunk_func = chunk_func; + state->metadata_callback_opaque = opaque; +} + +/* Escalate internal functions visibility; for testing purposes only. */ +#if defined(BROTLI_TEST) +BROTLI_BOOL SafeReadSymbolForTest( + const HuffmanCode*, BrotliBitReader*, brotli_reg_t*); +BROTLI_BOOL SafeReadSymbolForTest( + const HuffmanCode* table, BrotliBitReader* br, brotli_reg_t* result) { + return SafeReadSymbol(table, br, result); +} + +void InverseMoveToFrontTransformForTest( + uint8_t*, brotli_reg_t, BrotliDecoderState*); +void InverseMoveToFrontTransformForTest( + uint8_t* v, brotli_reg_t l, BrotliDecoderState* s) { + InverseMoveToFrontTransform(v, l, s); +} +#endif + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif diff --git a/modules/brotli/dec/huffman.c b/modules/brotli/dec/huffman.c new file mode 100644 index 0000000000..3806454864 --- /dev/null +++ b/modules/brotli/dec/huffman.c @@ -0,0 +1,342 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Utilities for building Huffman decoding tables. */ + +#include "huffman.h" + +#include <string.h> /* memcpy, memset */ + +#include <brotli/types.h> + +#include "../common/constants.h" +#include "../common/platform.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +#define BROTLI_REVERSE_BITS_MAX 8 + +#if defined(BROTLI_RBIT) +#define BROTLI_REVERSE_BITS_BASE \ + ((sizeof(brotli_reg_t) << 3) - BROTLI_REVERSE_BITS_MAX) +#else +#define BROTLI_REVERSE_BITS_BASE 0 +static uint8_t kReverseBits[1 << BROTLI_REVERSE_BITS_MAX] = { + 0x00, 0x80, 0x40, 0xC0, 0x20, 0xA0, 0x60, 0xE0, + 0x10, 0x90, 0x50, 0xD0, 0x30, 0xB0, 0x70, 0xF0, + 0x08, 0x88, 0x48, 0xC8, 0x28, 0xA8, 0x68, 0xE8, + 0x18, 0x98, 0x58, 0xD8, 0x38, 0xB8, 0x78, 0xF8, + 0x04, 0x84, 0x44, 0xC4, 0x24, 0xA4, 0x64, 0xE4, + 0x14, 0x94, 0x54, 0xD4, 0x34, 0xB4, 0x74, 0xF4, + 0x0C, 0x8C, 0x4C, 0xCC, 0x2C, 0xAC, 0x6C, 0xEC, + 0x1C, 0x9C, 0x5C, 0xDC, 0x3C, 0xBC, 0x7C, 0xFC, + 0x02, 0x82, 0x42, 0xC2, 0x22, 0xA2, 0x62, 0xE2, + 0x12, 0x92, 0x52, 0xD2, 0x32, 0xB2, 0x72, 0xF2, + 0x0A, 0x8A, 0x4A, 0xCA, 0x2A, 0xAA, 0x6A, 0xEA, + 0x1A, 0x9A, 0x5A, 0xDA, 0x3A, 0xBA, 0x7A, 0xFA, + 0x06, 0x86, 0x46, 0xC6, 0x26, 0xA6, 0x66, 0xE6, + 0x16, 0x96, 0x56, 0xD6, 0x36, 0xB6, 0x76, 0xF6, + 0x0E, 0x8E, 0x4E, 0xCE, 0x2E, 0xAE, 0x6E, 0xEE, + 0x1E, 0x9E, 0x5E, 0xDE, 0x3E, 0xBE, 0x7E, 0xFE, + 0x01, 0x81, 0x41, 0xC1, 0x21, 0xA1, 0x61, 0xE1, + 0x11, 0x91, 0x51, 0xD1, 0x31, 0xB1, 0x71, 0xF1, + 0x09, 0x89, 0x49, 0xC9, 0x29, 0xA9, 0x69, 0xE9, + 0x19, 0x99, 0x59, 0xD9, 0x39, 0xB9, 0x79, 0xF9, + 0x05, 0x85, 0x45, 0xC5, 0x25, 0xA5, 0x65, 0xE5, + 0x15, 0x95, 0x55, 0xD5, 0x35, 0xB5, 0x75, 0xF5, + 0x0D, 0x8D, 0x4D, 0xCD, 0x2D, 0xAD, 0x6D, 0xED, + 0x1D, 0x9D, 0x5D, 0xDD, 0x3D, 0xBD, 0x7D, 0xFD, + 0x03, 0x83, 0x43, 0xC3, 0x23, 0xA3, 0x63, 0xE3, + 0x13, 0x93, 0x53, 0xD3, 0x33, 0xB3, 0x73, 0xF3, + 0x0B, 0x8B, 0x4B, 0xCB, 0x2B, 0xAB, 0x6B, 0xEB, + 0x1B, 0x9B, 0x5B, 0xDB, 0x3B, 0xBB, 0x7B, 0xFB, + 0x07, 0x87, 0x47, 0xC7, 0x27, 0xA7, 0x67, 0xE7, + 0x17, 0x97, 0x57, 0xD7, 0x37, 0xB7, 0x77, 0xF7, + 0x0F, 0x8F, 0x4F, 0xCF, 0x2F, 0xAF, 0x6F, 0xEF, + 0x1F, 0x9F, 0x5F, 0xDF, 0x3F, 0xBF, 0x7F, 0xFF +}; +#endif /* BROTLI_RBIT */ + +#define BROTLI_REVERSE_BITS_LOWEST \ + ((brotli_reg_t)1 << (BROTLI_REVERSE_BITS_MAX - 1 + BROTLI_REVERSE_BITS_BASE)) + +/* Returns reverse(num >> BROTLI_REVERSE_BITS_BASE, BROTLI_REVERSE_BITS_MAX), + where reverse(value, len) is the bit-wise reversal of the len least + significant bits of value. */ +static BROTLI_INLINE brotli_reg_t BrotliReverseBits(brotli_reg_t num) { +#if defined(BROTLI_RBIT) + return BROTLI_RBIT(num); +#else + return kReverseBits[num]; +#endif +} + +/* Stores code in table[0], table[step], table[2*step], ..., table[end] */ +/* Assumes that end is an integer multiple of step */ +static BROTLI_INLINE void ReplicateValue(HuffmanCode* table, + int step, int end, + HuffmanCode code) { + do { + end -= step; + table[end] = code; + } while (end > 0); +} + +/* Returns the table width of the next 2nd level table. |count| is the histogram + of bit lengths for the remaining symbols, |len| is the code length of the + next processed symbol. */ +static BROTLI_INLINE int NextTableBitSize(const uint16_t* const count, + int len, int root_bits) { + int left = 1 << (len - root_bits); + while (len < BROTLI_HUFFMAN_MAX_CODE_LENGTH) { + left -= count[len]; + if (left <= 0) break; + ++len; + left <<= 1; + } + return len - root_bits; +} + +void BrotliBuildCodeLengthsHuffmanTable(HuffmanCode* table, + const uint8_t* const code_lengths, + uint16_t* count) { + HuffmanCode code; /* current table entry */ + int symbol; /* symbol index in original or sorted table */ + brotli_reg_t key; /* prefix code */ + brotli_reg_t key_step; /* prefix code addend */ + int step; /* step size to replicate values in current table */ + int table_size; /* size of current table */ + int sorted[BROTLI_CODE_LENGTH_CODES]; /* symbols sorted by code length */ + /* offsets in sorted table for each length */ + int offset[BROTLI_HUFFMAN_MAX_CODE_LENGTH_CODE_LENGTH + 1]; + int bits; + int bits_count; + BROTLI_DCHECK(BROTLI_HUFFMAN_MAX_CODE_LENGTH_CODE_LENGTH <= + BROTLI_REVERSE_BITS_MAX); + BROTLI_DCHECK(BROTLI_HUFFMAN_MAX_CODE_LENGTH_CODE_LENGTH == 5); + + /* Generate offsets into sorted symbol table by code length. */ + symbol = -1; + bits = 1; + /* BROTLI_HUFFMAN_MAX_CODE_LENGTH_CODE_LENGTH == 5 */ + BROTLI_REPEAT_5({ + symbol += count[bits]; + offset[bits] = symbol; + bits++; + }); + /* Symbols with code length 0 are placed after all other symbols. */ + offset[0] = BROTLI_CODE_LENGTH_CODES - 1; + + /* Sort symbols by length, by symbol order within each length. */ + symbol = BROTLI_CODE_LENGTH_CODES; + do { + BROTLI_REPEAT_6({ + symbol--; + sorted[offset[code_lengths[symbol]]--] = symbol; + }); + } while (symbol != 0); + + table_size = 1 << BROTLI_HUFFMAN_MAX_CODE_LENGTH_CODE_LENGTH; + + /* Special case: all symbols but one have 0 code length. */ + if (offset[0] == 0) { + code = ConstructHuffmanCode(0, (uint16_t)sorted[0]); + for (key = 0; key < (brotli_reg_t)table_size; ++key) { + table[key] = code; + } + return; + } + + /* Fill in table. */ + key = 0; + key_step = BROTLI_REVERSE_BITS_LOWEST; + symbol = 0; + bits = 1; + step = 2; + do { + for (bits_count = count[bits]; bits_count != 0; --bits_count) { + code = ConstructHuffmanCode((uint8_t)bits, (uint16_t)sorted[symbol++]); + ReplicateValue(&table[BrotliReverseBits(key)], step, table_size, code); + key += key_step; + } + step <<= 1; + key_step >>= 1; + } while (++bits <= BROTLI_HUFFMAN_MAX_CODE_LENGTH_CODE_LENGTH); +} + +uint32_t BrotliBuildHuffmanTable(HuffmanCode* root_table, + int root_bits, + const uint16_t* const symbol_lists, + uint16_t* count) { + HuffmanCode code; /* current table entry */ + HuffmanCode* table; /* next available space in table */ + int len; /* current code length */ + int symbol; /* symbol index in original or sorted table */ + brotli_reg_t key; /* prefix code */ + brotli_reg_t key_step; /* prefix code addend */ + brotli_reg_t sub_key; /* 2nd level table prefix code */ + brotli_reg_t sub_key_step; /* 2nd level table prefix code addend */ + int step; /* step size to replicate values in current table */ + int table_bits; /* key length of current table */ + int table_size; /* size of current table */ + int total_size; /* sum of root table size and 2nd level table sizes */ + int max_length = -1; + int bits; + int bits_count; + + BROTLI_DCHECK(root_bits <= BROTLI_REVERSE_BITS_MAX); + BROTLI_DCHECK(BROTLI_HUFFMAN_MAX_CODE_LENGTH - root_bits <= + BROTLI_REVERSE_BITS_MAX); + + while (symbol_lists[max_length] == 0xFFFF) max_length--; + max_length += BROTLI_HUFFMAN_MAX_CODE_LENGTH + 1; + + table = root_table; + table_bits = root_bits; + table_size = 1 << table_bits; + total_size = table_size; + + /* Fill in the root table. Reduce the table size to if possible, + and create the repetitions by memcpy. */ + if (table_bits > max_length) { + table_bits = max_length; + table_size = 1 << table_bits; + } + key = 0; + key_step = BROTLI_REVERSE_BITS_LOWEST; + bits = 1; + step = 2; + do { + symbol = bits - (BROTLI_HUFFMAN_MAX_CODE_LENGTH + 1); + for (bits_count = count[bits]; bits_count != 0; --bits_count) { + symbol = symbol_lists[symbol]; + code = ConstructHuffmanCode((uint8_t)bits, (uint16_t)symbol); + ReplicateValue(&table[BrotliReverseBits(key)], step, table_size, code); + key += key_step; + } + step <<= 1; + key_step >>= 1; + } while (++bits <= table_bits); + + /* If root_bits != table_bits then replicate to fill the remaining slots. */ + while (total_size != table_size) { + memcpy(&table[table_size], &table[0], + (size_t)table_size * sizeof(table[0])); + table_size <<= 1; + } + + /* Fill in 2nd level tables and add pointers to root table. */ + key_step = BROTLI_REVERSE_BITS_LOWEST >> (root_bits - 1); + sub_key = (BROTLI_REVERSE_BITS_LOWEST << 1); + sub_key_step = BROTLI_REVERSE_BITS_LOWEST; + for (len = root_bits + 1, step = 2; len <= max_length; ++len) { + symbol = len - (BROTLI_HUFFMAN_MAX_CODE_LENGTH + 1); + for (; count[len] != 0; --count[len]) { + if (sub_key == (BROTLI_REVERSE_BITS_LOWEST << 1U)) { + table += table_size; + table_bits = NextTableBitSize(count, len, root_bits); + table_size = 1 << table_bits; + total_size += table_size; + sub_key = BrotliReverseBits(key); + key += key_step; + root_table[sub_key] = ConstructHuffmanCode( + (uint8_t)(table_bits + root_bits), + (uint16_t)(((size_t)(table - root_table)) - sub_key)); + sub_key = 0; + } + symbol = symbol_lists[symbol]; + code = ConstructHuffmanCode((uint8_t)(len - root_bits), (uint16_t)symbol); + ReplicateValue( + &table[BrotliReverseBits(sub_key)], step, table_size, code); + sub_key += sub_key_step; + } + step <<= 1; + sub_key_step >>= 1; + } + return (uint32_t)total_size; +} + +uint32_t BrotliBuildSimpleHuffmanTable(HuffmanCode* table, + int root_bits, + uint16_t* val, + uint32_t num_symbols) { + uint32_t table_size = 1; + const uint32_t goal_size = 1U << root_bits; + switch (num_symbols) { + case 0: + table[0] = ConstructHuffmanCode(0, val[0]); + break; + case 1: + if (val[1] > val[0]) { + table[0] = ConstructHuffmanCode(1, val[0]); + table[1] = ConstructHuffmanCode(1, val[1]); + } else { + table[0] = ConstructHuffmanCode(1, val[1]); + table[1] = ConstructHuffmanCode(1, val[0]); + } + table_size = 2; + break; + case 2: + table[0] = ConstructHuffmanCode(1, val[0]); + table[2] = ConstructHuffmanCode(1, val[0]); + if (val[2] > val[1]) { + table[1] = ConstructHuffmanCode(2, val[1]); + table[3] = ConstructHuffmanCode(2, val[2]); + } else { + table[1] = ConstructHuffmanCode(2, val[2]); + table[3] = ConstructHuffmanCode(2, val[1]); + } + table_size = 4; + break; + case 3: { + int i, k; + for (i = 0; i < 3; ++i) { + for (k = i + 1; k < 4; ++k) { + if (val[k] < val[i]) { + uint16_t t = val[k]; + val[k] = val[i]; + val[i] = t; + } + } + } + table[0] = ConstructHuffmanCode(2, val[0]); + table[2] = ConstructHuffmanCode(2, val[1]); + table[1] = ConstructHuffmanCode(2, val[2]); + table[3] = ConstructHuffmanCode(2, val[3]); + table_size = 4; + break; + } + case 4: { + if (val[3] < val[2]) { + uint16_t t = val[3]; + val[3] = val[2]; + val[2] = t; + } + table[0] = ConstructHuffmanCode(1, val[0]); + table[1] = ConstructHuffmanCode(2, val[1]); + table[2] = ConstructHuffmanCode(1, val[0]); + table[3] = ConstructHuffmanCode(3, val[2]); + table[4] = ConstructHuffmanCode(1, val[0]); + table[5] = ConstructHuffmanCode(2, val[1]); + table[6] = ConstructHuffmanCode(1, val[0]); + table[7] = ConstructHuffmanCode(3, val[3]); + table_size = 8; + break; + } + } + while (table_size != goal_size) { + memcpy(&table[table_size], &table[0], + (size_t)table_size * sizeof(table[0])); + table_size <<= 1; + } + return goal_size; +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif diff --git a/modules/brotli/dec/huffman.h b/modules/brotli/dec/huffman.h new file mode 100644 index 0000000000..50360962c7 --- /dev/null +++ b/modules/brotli/dec/huffman.h @@ -0,0 +1,122 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Utilities for building Huffman decoding tables. */ + +#ifndef BROTLI_DEC_HUFFMAN_H_ +#define BROTLI_DEC_HUFFMAN_H_ + +#include <brotli/types.h> + +#include "../common/platform.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +#define BROTLI_HUFFMAN_MAX_CODE_LENGTH 15 + +/* BROTLI_NUM_BLOCK_LEN_SYMBOLS == 26 */ +#define BROTLI_HUFFMAN_MAX_SIZE_26 396 +/* BROTLI_MAX_BLOCK_TYPE_SYMBOLS == 258 */ +#define BROTLI_HUFFMAN_MAX_SIZE_258 632 +/* BROTLI_MAX_CONTEXT_MAP_SYMBOLS == 272 */ +#define BROTLI_HUFFMAN_MAX_SIZE_272 646 + +#define BROTLI_HUFFMAN_MAX_CODE_LENGTH_CODE_LENGTH 5 + +#if ((defined(BROTLI_TARGET_ARMV7) || defined(BROTLI_TARGET_ARMV8_32)) && \ + BROTLI_GNUC_HAS_ATTRIBUTE(aligned, 2, 7, 0)) +#define BROTLI_HUFFMAN_CODE_FAST_LOAD +#endif + +#if !defined(BROTLI_HUFFMAN_CODE_FAST_LOAD) +/* Do not create this struct directly - use the ConstructHuffmanCode + * constructor below! */ +typedef struct { + uint8_t bits; /* number of bits used for this symbol */ + uint16_t value; /* symbol value or table offset */ +} HuffmanCode; + +static BROTLI_INLINE HuffmanCode ConstructHuffmanCode(const uint8_t bits, + const uint16_t value) { + HuffmanCode h; + h.bits = bits; + h.value = value; + return h; +} + +/* Please use the following macros to optimize HuffmanCode accesses in hot + * paths. + * + * For example, assuming |table| contains a HuffmanCode pointer: + * + * BROTLI_HC_MARK_TABLE_FOR_FAST_LOAD(table); + * BROTLI_HC_ADJUST_TABLE_INDEX(table, index_into_table); + * *bits = BROTLI_HC_GET_BITS(table); + * *value = BROTLI_HC_GET_VALUE(table); + * BROTLI_HC_ADJUST_TABLE_INDEX(table, offset); + * *bits2 = BROTLI_HC_GET_BITS(table); + * *value2 = BROTLI_HC_GET_VALUE(table); + * + */ + +#define BROTLI_HC_MARK_TABLE_FOR_FAST_LOAD(H) +#define BROTLI_HC_ADJUST_TABLE_INDEX(H, V) H += (V) + +/* These must be given a HuffmanCode pointer! */ +#define BROTLI_HC_FAST_LOAD_BITS(H) (H->bits) +#define BROTLI_HC_FAST_LOAD_VALUE(H) (H->value) + +#else /* BROTLI_HUFFMAN_CODE_FAST_LOAD */ + +typedef BROTLI_ALIGNED(4) uint32_t HuffmanCode; + +static BROTLI_INLINE HuffmanCode ConstructHuffmanCode(const uint8_t bits, + const uint16_t value) { + return (HuffmanCode) ((value & 0xFFFF) << 16) | (bits & 0xFF); +} + +#define BROTLI_HC_MARK_TABLE_FOR_FAST_LOAD(H) uint32_t __fastload_##H = (*H) +#define BROTLI_HC_ADJUST_TABLE_INDEX(H, V) H += (V); __fastload_##H = (*H) + +/* These must be given a HuffmanCode pointer! */ +#define BROTLI_HC_FAST_LOAD_BITS(H) ((__fastload_##H) & 0xFF) +#define BROTLI_HC_FAST_LOAD_VALUE(H) ((__fastload_##H) >> 16) +#endif /* BROTLI_HUFFMAN_CODE_FAST_LOAD */ + +/* Builds Huffman lookup table assuming code lengths are in symbol order. */ +BROTLI_INTERNAL void BrotliBuildCodeLengthsHuffmanTable(HuffmanCode* root_table, + const uint8_t* const code_lengths, uint16_t* count); + +/* Builds Huffman lookup table assuming code lengths are in symbol order. + Returns size of resulting table. */ +BROTLI_INTERNAL uint32_t BrotliBuildHuffmanTable(HuffmanCode* root_table, + int root_bits, const uint16_t* const symbol_lists, uint16_t* count); + +/* Builds a simple Huffman table. The |num_symbols| parameter is to be + interpreted as follows: 0 means 1 symbol, 1 means 2 symbols, + 2 means 3 symbols, 3 means 4 symbols with lengths [2, 2, 2, 2], + 4 means 4 symbols with lengths [1, 2, 3, 3]. */ +BROTLI_INTERNAL uint32_t BrotliBuildSimpleHuffmanTable(HuffmanCode* table, + int root_bits, uint16_t* symbols, uint32_t num_symbols); + +/* Contains a collection of Huffman trees with the same alphabet size. */ +/* alphabet_size_limit is needed due to simple codes, since + log2(alphabet_size_max) could be greater than log2(alphabet_size_limit). */ +typedef struct { + HuffmanCode** htrees; + HuffmanCode* codes; + uint16_t alphabet_size_max; + uint16_t alphabet_size_limit; + uint16_t num_htrees; +} HuffmanTreeGroup; + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_DEC_HUFFMAN_H_ */ diff --git a/modules/brotli/dec/prefix.h b/modules/brotli/dec/prefix.h new file mode 100644 index 0000000000..e8acf07740 --- /dev/null +++ b/modules/brotli/dec/prefix.h @@ -0,0 +1,733 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Lookup tables to map prefix codes to value ranges. This is used during + decoding of the block lengths, literal insertion lengths and copy lengths. */ + +#ifndef BROTLI_DEC_PREFIX_H_ +#define BROTLI_DEC_PREFIX_H_ + +#include <brotli/types.h> + +#include "../common/constants.h" + +typedef struct CmdLutElement { + uint8_t insert_len_extra_bits; + uint8_t copy_len_extra_bits; + int8_t distance_code; + uint8_t context; + uint16_t insert_len_offset; + uint16_t copy_len_offset; +} CmdLutElement; + +static const CmdLutElement kCmdLut[BROTLI_NUM_COMMAND_SYMBOLS] = { + { 0x00, 0x00, 0, 0x00, 0x0000, 0x0002 }, + { 0x00, 0x00, 0, 0x01, 0x0000, 0x0003 }, + { 0x00, 0x00, 0, 0x02, 0x0000, 0x0004 }, + { 0x00, 0x00, 0, 0x03, 0x0000, 0x0005 }, + { 0x00, 0x00, 0, 0x03, 0x0000, 0x0006 }, + { 0x00, 0x00, 0, 0x03, 0x0000, 0x0007 }, + { 0x00, 0x00, 0, 0x03, 0x0000, 0x0008 }, + { 0x00, 0x00, 0, 0x03, 0x0000, 0x0009 }, + { 0x00, 0x00, 0, 0x00, 0x0001, 0x0002 }, + { 0x00, 0x00, 0, 0x01, 0x0001, 0x0003 }, + { 0x00, 0x00, 0, 0x02, 0x0001, 0x0004 }, + { 0x00, 0x00, 0, 0x03, 0x0001, 0x0005 }, + { 0x00, 0x00, 0, 0x03, 0x0001, 0x0006 }, + { 0x00, 0x00, 0, 0x03, 0x0001, 0x0007 }, + { 0x00, 0x00, 0, 0x03, 0x0001, 0x0008 }, + { 0x00, 0x00, 0, 0x03, 0x0001, 0x0009 }, + { 0x00, 0x00, 0, 0x00, 0x0002, 0x0002 }, + { 0x00, 0x00, 0, 0x01, 0x0002, 0x0003 }, + { 0x00, 0x00, 0, 0x02, 0x0002, 0x0004 }, + { 0x00, 0x00, 0, 0x03, 0x0002, 0x0005 }, + { 0x00, 0x00, 0, 0x03, 0x0002, 0x0006 }, + { 0x00, 0x00, 0, 0x03, 0x0002, 0x0007 }, + { 0x00, 0x00, 0, 0x03, 0x0002, 0x0008 }, + { 0x00, 0x00, 0, 0x03, 0x0002, 0x0009 }, + { 0x00, 0x00, 0, 0x00, 0x0003, 0x0002 }, + { 0x00, 0x00, 0, 0x01, 0x0003, 0x0003 }, + { 0x00, 0x00, 0, 0x02, 0x0003, 0x0004 }, + { 0x00, 0x00, 0, 0x03, 0x0003, 0x0005 }, + { 0x00, 0x00, 0, 0x03, 0x0003, 0x0006 }, + { 0x00, 0x00, 0, 0x03, 0x0003, 0x0007 }, + { 0x00, 0x00, 0, 0x03, 0x0003, 0x0008 }, + { 0x00, 0x00, 0, 0x03, 0x0003, 0x0009 }, + { 0x00, 0x00, 0, 0x00, 0x0004, 0x0002 }, + { 0x00, 0x00, 0, 0x01, 0x0004, 0x0003 }, + { 0x00, 0x00, 0, 0x02, 0x0004, 0x0004 }, + { 0x00, 0x00, 0, 0x03, 0x0004, 0x0005 }, + { 0x00, 0x00, 0, 0x03, 0x0004, 0x0006 }, + { 0x00, 0x00, 0, 0x03, 0x0004, 0x0007 }, + { 0x00, 0x00, 0, 0x03, 0x0004, 0x0008 }, + { 0x00, 0x00, 0, 0x03, 0x0004, 0x0009 }, + { 0x00, 0x00, 0, 0x00, 0x0005, 0x0002 }, + { 0x00, 0x00, 0, 0x01, 0x0005, 0x0003 }, + { 0x00, 0x00, 0, 0x02, 0x0005, 0x0004 }, + { 0x00, 0x00, 0, 0x03, 0x0005, 0x0005 }, + { 0x00, 0x00, 0, 0x03, 0x0005, 0x0006 }, + { 0x00, 0x00, 0, 0x03, 0x0005, 0x0007 }, + { 0x00, 0x00, 0, 0x03, 0x0005, 0x0008 }, + { 0x00, 0x00, 0, 0x03, 0x0005, 0x0009 }, + { 0x01, 0x00, 0, 0x00, 0x0006, 0x0002 }, + { 0x01, 0x00, 0, 0x01, 0x0006, 0x0003 }, + { 0x01, 0x00, 0, 0x02, 0x0006, 0x0004 }, + { 0x01, 0x00, 0, 0x03, 0x0006, 0x0005 }, + { 0x01, 0x00, 0, 0x03, 0x0006, 0x0006 }, + { 0x01, 0x00, 0, 0x03, 0x0006, 0x0007 }, + { 0x01, 0x00, 0, 0x03, 0x0006, 0x0008 }, + { 0x01, 0x00, 0, 0x03, 0x0006, 0x0009 }, + { 0x01, 0x00, 0, 0x00, 0x0008, 0x0002 }, + { 0x01, 0x00, 0, 0x01, 0x0008, 0x0003 }, + { 0x01, 0x00, 0, 0x02, 0x0008, 0x0004 }, + { 0x01, 0x00, 0, 0x03, 0x0008, 0x0005 }, + { 0x01, 0x00, 0, 0x03, 0x0008, 0x0006 }, + { 0x01, 0x00, 0, 0x03, 0x0008, 0x0007 }, + { 0x01, 0x00, 0, 0x03, 0x0008, 0x0008 }, + { 0x01, 0x00, 0, 0x03, 0x0008, 0x0009 }, + { 0x00, 0x01, 0, 0x03, 0x0000, 0x000a }, + { 0x00, 0x01, 0, 0x03, 0x0000, 0x000c }, + { 0x00, 0x02, 0, 0x03, 0x0000, 0x000e }, + { 0x00, 0x02, 0, 0x03, 0x0000, 0x0012 }, + { 0x00, 0x03, 0, 0x03, 0x0000, 0x0016 }, + { 0x00, 0x03, 0, 0x03, 0x0000, 0x001e }, + { 0x00, 0x04, 0, 0x03, 0x0000, 0x0026 }, + { 0x00, 0x04, 0, 0x03, 0x0000, 0x0036 }, + { 0x00, 0x01, 0, 0x03, 0x0001, 0x000a }, + { 0x00, 0x01, 0, 0x03, 0x0001, 0x000c }, + { 0x00, 0x02, 0, 0x03, 0x0001, 0x000e }, + { 0x00, 0x02, 0, 0x03, 0x0001, 0x0012 }, + { 0x00, 0x03, 0, 0x03, 0x0001, 0x0016 }, + { 0x00, 0x03, 0, 0x03, 0x0001, 0x001e }, + { 0x00, 0x04, 0, 0x03, 0x0001, 0x0026 }, + { 0x00, 0x04, 0, 0x03, 0x0001, 0x0036 }, + { 0x00, 0x01, 0, 0x03, 0x0002, 0x000a }, + { 0x00, 0x01, 0, 0x03, 0x0002, 0x000c }, + { 0x00, 0x02, 0, 0x03, 0x0002, 0x000e }, + { 0x00, 0x02, 0, 0x03, 0x0002, 0x0012 }, + { 0x00, 0x03, 0, 0x03, 0x0002, 0x0016 }, + { 0x00, 0x03, 0, 0x03, 0x0002, 0x001e }, + { 0x00, 0x04, 0, 0x03, 0x0002, 0x0026 }, + { 0x00, 0x04, 0, 0x03, 0x0002, 0x0036 }, + { 0x00, 0x01, 0, 0x03, 0x0003, 0x000a }, + { 0x00, 0x01, 0, 0x03, 0x0003, 0x000c }, + { 0x00, 0x02, 0, 0x03, 0x0003, 0x000e }, + { 0x00, 0x02, 0, 0x03, 0x0003, 0x0012 }, + { 0x00, 0x03, 0, 0x03, 0x0003, 0x0016 }, + { 0x00, 0x03, 0, 0x03, 0x0003, 0x001e }, + { 0x00, 0x04, 0, 0x03, 0x0003, 0x0026 }, + { 0x00, 0x04, 0, 0x03, 0x0003, 0x0036 }, + { 0x00, 0x01, 0, 0x03, 0x0004, 0x000a }, + { 0x00, 0x01, 0, 0x03, 0x0004, 0x000c }, + { 0x00, 0x02, 0, 0x03, 0x0004, 0x000e }, + { 0x00, 0x02, 0, 0x03, 0x0004, 0x0012 }, + { 0x00, 0x03, 0, 0x03, 0x0004, 0x0016 }, + { 0x00, 0x03, 0, 0x03, 0x0004, 0x001e }, + { 0x00, 0x04, 0, 0x03, 0x0004, 0x0026 }, + { 0x00, 0x04, 0, 0x03, 0x0004, 0x0036 }, + { 0x00, 0x01, 0, 0x03, 0x0005, 0x000a }, + { 0x00, 0x01, 0, 0x03, 0x0005, 0x000c }, + { 0x00, 0x02, 0, 0x03, 0x0005, 0x000e }, + { 0x00, 0x02, 0, 0x03, 0x0005, 0x0012 }, + { 0x00, 0x03, 0, 0x03, 0x0005, 0x0016 }, + { 0x00, 0x03, 0, 0x03, 0x0005, 0x001e }, + { 0x00, 0x04, 0, 0x03, 0x0005, 0x0026 }, + { 0x00, 0x04, 0, 0x03, 0x0005, 0x0036 }, + { 0x01, 0x01, 0, 0x03, 0x0006, 0x000a }, + { 0x01, 0x01, 0, 0x03, 0x0006, 0x000c }, + { 0x01, 0x02, 0, 0x03, 0x0006, 0x000e }, + { 0x01, 0x02, 0, 0x03, 0x0006, 0x0012 }, + { 0x01, 0x03, 0, 0x03, 0x0006, 0x0016 }, + { 0x01, 0x03, 0, 0x03, 0x0006, 0x001e }, + { 0x01, 0x04, 0, 0x03, 0x0006, 0x0026 }, + { 0x01, 0x04, 0, 0x03, 0x0006, 0x0036 }, + { 0x01, 0x01, 0, 0x03, 0x0008, 0x000a }, + { 0x01, 0x01, 0, 0x03, 0x0008, 0x000c }, + { 0x01, 0x02, 0, 0x03, 0x0008, 0x000e }, + { 0x01, 0x02, 0, 0x03, 0x0008, 0x0012 }, + { 0x01, 0x03, 0, 0x03, 0x0008, 0x0016 }, + { 0x01, 0x03, 0, 0x03, 0x0008, 0x001e }, + { 0x01, 0x04, 0, 0x03, 0x0008, 0x0026 }, + { 0x01, 0x04, 0, 0x03, 0x0008, 0x0036 }, + { 0x00, 0x00, -1, 0x00, 0x0000, 0x0002 }, + { 0x00, 0x00, -1, 0x01, 0x0000, 0x0003 }, + { 0x00, 0x00, -1, 0x02, 0x0000, 0x0004 }, + { 0x00, 0x00, -1, 0x03, 0x0000, 0x0005 }, + { 0x00, 0x00, -1, 0x03, 0x0000, 0x0006 }, + { 0x00, 0x00, -1, 0x03, 0x0000, 0x0007 }, + { 0x00, 0x00, -1, 0x03, 0x0000, 0x0008 }, + { 0x00, 0x00, -1, 0x03, 0x0000, 0x0009 }, + { 0x00, 0x00, -1, 0x00, 0x0001, 0x0002 }, + { 0x00, 0x00, -1, 0x01, 0x0001, 0x0003 }, + { 0x00, 0x00, -1, 0x02, 0x0001, 0x0004 }, + { 0x00, 0x00, -1, 0x03, 0x0001, 0x0005 }, + { 0x00, 0x00, -1, 0x03, 0x0001, 0x0006 }, + { 0x00, 0x00, -1, 0x03, 0x0001, 0x0007 }, + { 0x00, 0x00, -1, 0x03, 0x0001, 0x0008 }, + { 0x00, 0x00, -1, 0x03, 0x0001, 0x0009 }, + { 0x00, 0x00, -1, 0x00, 0x0002, 0x0002 }, + { 0x00, 0x00, -1, 0x01, 0x0002, 0x0003 }, + { 0x00, 0x00, -1, 0x02, 0x0002, 0x0004 }, + { 0x00, 0x00, -1, 0x03, 0x0002, 0x0005 }, + { 0x00, 0x00, -1, 0x03, 0x0002, 0x0006 }, + { 0x00, 0x00, -1, 0x03, 0x0002, 0x0007 }, + { 0x00, 0x00, -1, 0x03, 0x0002, 0x0008 }, + { 0x00, 0x00, -1, 0x03, 0x0002, 0x0009 }, + { 0x00, 0x00, -1, 0x00, 0x0003, 0x0002 }, + { 0x00, 0x00, -1, 0x01, 0x0003, 0x0003 }, + { 0x00, 0x00, -1, 0x02, 0x0003, 0x0004 }, + { 0x00, 0x00, -1, 0x03, 0x0003, 0x0005 }, + { 0x00, 0x00, -1, 0x03, 0x0003, 0x0006 }, + { 0x00, 0x00, -1, 0x03, 0x0003, 0x0007 }, + { 0x00, 0x00, -1, 0x03, 0x0003, 0x0008 }, + { 0x00, 0x00, -1, 0x03, 0x0003, 0x0009 }, + { 0x00, 0x00, -1, 0x00, 0x0004, 0x0002 }, + { 0x00, 0x00, -1, 0x01, 0x0004, 0x0003 }, + { 0x00, 0x00, -1, 0x02, 0x0004, 0x0004 }, + { 0x00, 0x00, -1, 0x03, 0x0004, 0x0005 }, + { 0x00, 0x00, -1, 0x03, 0x0004, 0x0006 }, + { 0x00, 0x00, -1, 0x03, 0x0004, 0x0007 }, + { 0x00, 0x00, -1, 0x03, 0x0004, 0x0008 }, + { 0x00, 0x00, -1, 0x03, 0x0004, 0x0009 }, + { 0x00, 0x00, -1, 0x00, 0x0005, 0x0002 }, + { 0x00, 0x00, -1, 0x01, 0x0005, 0x0003 }, + { 0x00, 0x00, -1, 0x02, 0x0005, 0x0004 }, + { 0x00, 0x00, -1, 0x03, 0x0005, 0x0005 }, + { 0x00, 0x00, -1, 0x03, 0x0005, 0x0006 }, + { 0x00, 0x00, -1, 0x03, 0x0005, 0x0007 }, + { 0x00, 0x00, -1, 0x03, 0x0005, 0x0008 }, + { 0x00, 0x00, -1, 0x03, 0x0005, 0x0009 }, + { 0x01, 0x00, -1, 0x00, 0x0006, 0x0002 }, + { 0x01, 0x00, -1, 0x01, 0x0006, 0x0003 }, + { 0x01, 0x00, -1, 0x02, 0x0006, 0x0004 }, + { 0x01, 0x00, -1, 0x03, 0x0006, 0x0005 }, + { 0x01, 0x00, -1, 0x03, 0x0006, 0x0006 }, + { 0x01, 0x00, -1, 0x03, 0x0006, 0x0007 }, + { 0x01, 0x00, -1, 0x03, 0x0006, 0x0008 }, + { 0x01, 0x00, -1, 0x03, 0x0006, 0x0009 }, + { 0x01, 0x00, -1, 0x00, 0x0008, 0x0002 }, + { 0x01, 0x00, -1, 0x01, 0x0008, 0x0003 }, + { 0x01, 0x00, -1, 0x02, 0x0008, 0x0004 }, + { 0x01, 0x00, -1, 0x03, 0x0008, 0x0005 }, + { 0x01, 0x00, -1, 0x03, 0x0008, 0x0006 }, + { 0x01, 0x00, -1, 0x03, 0x0008, 0x0007 }, + { 0x01, 0x00, -1, 0x03, 0x0008, 0x0008 }, + { 0x01, 0x00, -1, 0x03, 0x0008, 0x0009 }, + { 0x00, 0x01, -1, 0x03, 0x0000, 0x000a }, + { 0x00, 0x01, -1, 0x03, 0x0000, 0x000c }, + { 0x00, 0x02, -1, 0x03, 0x0000, 0x000e }, + { 0x00, 0x02, -1, 0x03, 0x0000, 0x0012 }, + { 0x00, 0x03, -1, 0x03, 0x0000, 0x0016 }, + { 0x00, 0x03, -1, 0x03, 0x0000, 0x001e }, + { 0x00, 0x04, -1, 0x03, 0x0000, 0x0026 }, + { 0x00, 0x04, -1, 0x03, 0x0000, 0x0036 }, + { 0x00, 0x01, -1, 0x03, 0x0001, 0x000a }, + { 0x00, 0x01, -1, 0x03, 0x0001, 0x000c }, + { 0x00, 0x02, -1, 0x03, 0x0001, 0x000e }, + { 0x00, 0x02, -1, 0x03, 0x0001, 0x0012 }, + { 0x00, 0x03, -1, 0x03, 0x0001, 0x0016 }, + { 0x00, 0x03, -1, 0x03, 0x0001, 0x001e }, + { 0x00, 0x04, -1, 0x03, 0x0001, 0x0026 }, + { 0x00, 0x04, -1, 0x03, 0x0001, 0x0036 }, + { 0x00, 0x01, -1, 0x03, 0x0002, 0x000a }, + { 0x00, 0x01, -1, 0x03, 0x0002, 0x000c }, + { 0x00, 0x02, -1, 0x03, 0x0002, 0x000e }, + { 0x00, 0x02, -1, 0x03, 0x0002, 0x0012 }, + { 0x00, 0x03, -1, 0x03, 0x0002, 0x0016 }, + { 0x00, 0x03, -1, 0x03, 0x0002, 0x001e }, + { 0x00, 0x04, -1, 0x03, 0x0002, 0x0026 }, + { 0x00, 0x04, -1, 0x03, 0x0002, 0x0036 }, + { 0x00, 0x01, -1, 0x03, 0x0003, 0x000a }, + { 0x00, 0x01, -1, 0x03, 0x0003, 0x000c }, + { 0x00, 0x02, -1, 0x03, 0x0003, 0x000e }, + { 0x00, 0x02, -1, 0x03, 0x0003, 0x0012 }, + { 0x00, 0x03, -1, 0x03, 0x0003, 0x0016 }, + { 0x00, 0x03, -1, 0x03, 0x0003, 0x001e }, + { 0x00, 0x04, -1, 0x03, 0x0003, 0x0026 }, + { 0x00, 0x04, -1, 0x03, 0x0003, 0x0036 }, + { 0x00, 0x01, -1, 0x03, 0x0004, 0x000a }, + { 0x00, 0x01, -1, 0x03, 0x0004, 0x000c }, + { 0x00, 0x02, -1, 0x03, 0x0004, 0x000e }, + { 0x00, 0x02, -1, 0x03, 0x0004, 0x0012 }, + { 0x00, 0x03, -1, 0x03, 0x0004, 0x0016 }, + { 0x00, 0x03, -1, 0x03, 0x0004, 0x001e }, + { 0x00, 0x04, -1, 0x03, 0x0004, 0x0026 }, + { 0x00, 0x04, -1, 0x03, 0x0004, 0x0036 }, + { 0x00, 0x01, -1, 0x03, 0x0005, 0x000a }, + { 0x00, 0x01, -1, 0x03, 0x0005, 0x000c }, + { 0x00, 0x02, -1, 0x03, 0x0005, 0x000e }, + { 0x00, 0x02, -1, 0x03, 0x0005, 0x0012 }, + { 0x00, 0x03, -1, 0x03, 0x0005, 0x0016 }, + { 0x00, 0x03, -1, 0x03, 0x0005, 0x001e }, + { 0x00, 0x04, -1, 0x03, 0x0005, 0x0026 }, + { 0x00, 0x04, -1, 0x03, 0x0005, 0x0036 }, + { 0x01, 0x01, -1, 0x03, 0x0006, 0x000a }, + { 0x01, 0x01, -1, 0x03, 0x0006, 0x000c }, + { 0x01, 0x02, -1, 0x03, 0x0006, 0x000e }, + { 0x01, 0x02, -1, 0x03, 0x0006, 0x0012 }, + { 0x01, 0x03, -1, 0x03, 0x0006, 0x0016 }, + { 0x01, 0x03, -1, 0x03, 0x0006, 0x001e }, + { 0x01, 0x04, -1, 0x03, 0x0006, 0x0026 }, + { 0x01, 0x04, -1, 0x03, 0x0006, 0x0036 }, + { 0x01, 0x01, -1, 0x03, 0x0008, 0x000a }, + { 0x01, 0x01, -1, 0x03, 0x0008, 0x000c }, + { 0x01, 0x02, -1, 0x03, 0x0008, 0x000e }, + { 0x01, 0x02, -1, 0x03, 0x0008, 0x0012 }, + { 0x01, 0x03, -1, 0x03, 0x0008, 0x0016 }, + { 0x01, 0x03, -1, 0x03, 0x0008, 0x001e }, + { 0x01, 0x04, -1, 0x03, 0x0008, 0x0026 }, + { 0x01, 0x04, -1, 0x03, 0x0008, 0x0036 }, + { 0x02, 0x00, -1, 0x00, 0x000a, 0x0002 }, + { 0x02, 0x00, -1, 0x01, 0x000a, 0x0003 }, + { 0x02, 0x00, -1, 0x02, 0x000a, 0x0004 }, + { 0x02, 0x00, -1, 0x03, 0x000a, 0x0005 }, + { 0x02, 0x00, -1, 0x03, 0x000a, 0x0006 }, + { 0x02, 0x00, -1, 0x03, 0x000a, 0x0007 }, + { 0x02, 0x00, -1, 0x03, 0x000a, 0x0008 }, + { 0x02, 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}, + { 0x04, 0x0a, -1, 0x03, 0x0032, 0x0446 }, + { 0x04, 0x18, -1, 0x03, 0x0032, 0x0846 }, + { 0x05, 0x05, -1, 0x03, 0x0042, 0x0046 }, + { 0x05, 0x05, -1, 0x03, 0x0042, 0x0066 }, + { 0x05, 0x06, -1, 0x03, 0x0042, 0x0086 }, + { 0x05, 0x07, -1, 0x03, 0x0042, 0x00c6 }, + { 0x05, 0x08, -1, 0x03, 0x0042, 0x0146 }, + { 0x05, 0x09, -1, 0x03, 0x0042, 0x0246 }, + { 0x05, 0x0a, -1, 0x03, 0x0042, 0x0446 }, + { 0x05, 0x18, -1, 0x03, 0x0042, 0x0846 }, + { 0x05, 0x05, -1, 0x03, 0x0062, 0x0046 }, + { 0x05, 0x05, -1, 0x03, 0x0062, 0x0066 }, + { 0x05, 0x06, -1, 0x03, 0x0062, 0x0086 }, + { 0x05, 0x07, -1, 0x03, 0x0062, 0x00c6 }, + { 0x05, 0x08, -1, 0x03, 0x0062, 0x0146 }, + { 0x05, 0x09, -1, 0x03, 0x0062, 0x0246 }, + { 0x05, 0x0a, -1, 0x03, 0x0062, 0x0446 }, + { 0x05, 0x18, -1, 0x03, 0x0062, 0x0846 }, + { 0x06, 0x01, -1, 0x03, 0x0082, 0x000a }, + { 0x06, 0x01, -1, 0x03, 0x0082, 0x000c }, + { 0x06, 0x02, -1, 0x03, 0x0082, 0x000e }, + { 0x06, 0x02, -1, 0x03, 0x0082, 0x0012 }, + { 0x06, 0x03, -1, 0x03, 0x0082, 0x0016 }, + { 0x06, 0x03, -1, 0x03, 0x0082, 0x001e }, + { 0x06, 0x04, -1, 0x03, 0x0082, 0x0026 }, + { 0x06, 0x04, -1, 0x03, 0x0082, 0x0036 }, + { 0x07, 0x01, -1, 0x03, 0x00c2, 0x000a }, + { 0x07, 0x01, -1, 0x03, 0x00c2, 0x000c }, + { 0x07, 0x02, -1, 0x03, 0x00c2, 0x000e }, + { 0x07, 0x02, -1, 0x03, 0x00c2, 0x0012 }, + { 0x07, 0x03, -1, 0x03, 0x00c2, 0x0016 }, + { 0x07, 0x03, -1, 0x03, 0x00c2, 0x001e }, + { 0x07, 0x04, -1, 0x03, 0x00c2, 0x0026 }, + { 0x07, 0x04, -1, 0x03, 0x00c2, 0x0036 }, + { 0x08, 0x01, -1, 0x03, 0x0142, 0x000a }, + { 0x08, 0x01, -1, 0x03, 0x0142, 0x000c }, + { 0x08, 0x02, -1, 0x03, 0x0142, 0x000e }, + { 0x08, 0x02, -1, 0x03, 0x0142, 0x0012 }, + { 0x08, 0x03, -1, 0x03, 0x0142, 0x0016 }, + { 0x08, 0x03, -1, 0x03, 0x0142, 0x001e }, + { 0x08, 0x04, -1, 0x03, 0x0142, 0x0026 }, + { 0x08, 0x04, -1, 0x03, 0x0142, 0x0036 }, + { 0x09, 0x01, -1, 0x03, 0x0242, 0x000a }, + { 0x09, 0x01, -1, 0x03, 0x0242, 0x000c }, + { 0x09, 0x02, -1, 0x03, 0x0242, 0x000e }, + { 0x09, 0x02, -1, 0x03, 0x0242, 0x0012 }, + { 0x09, 0x03, -1, 0x03, 0x0242, 0x0016 }, + { 0x09, 0x03, -1, 0x03, 0x0242, 0x001e }, + { 0x09, 0x04, -1, 0x03, 0x0242, 0x0026 }, + { 0x09, 0x04, -1, 0x03, 0x0242, 0x0036 }, + { 0x0a, 0x01, -1, 0x03, 0x0442, 0x000a }, + { 0x0a, 0x01, -1, 0x03, 0x0442, 0x000c }, + { 0x0a, 0x02, -1, 0x03, 0x0442, 0x000e }, + { 0x0a, 0x02, -1, 0x03, 0x0442, 0x0012 }, + { 0x0a, 0x03, -1, 0x03, 0x0442, 0x0016 }, + { 0x0a, 0x03, -1, 0x03, 0x0442, 0x001e }, + { 0x0a, 0x04, -1, 0x03, 0x0442, 0x0026 }, + { 0x0a, 0x04, -1, 0x03, 0x0442, 0x0036 }, + { 0x0c, 0x01, -1, 0x03, 0x0842, 0x000a }, + { 0x0c, 0x01, -1, 0x03, 0x0842, 0x000c }, + { 0x0c, 0x02, -1, 0x03, 0x0842, 0x000e }, + { 0x0c, 0x02, -1, 0x03, 0x0842, 0x0012 }, + { 0x0c, 0x03, -1, 0x03, 0x0842, 0x0016 }, + { 0x0c, 0x03, -1, 0x03, 0x0842, 0x001e }, + { 0x0c, 0x04, -1, 0x03, 0x0842, 0x0026 }, + { 0x0c, 0x04, -1, 0x03, 0x0842, 0x0036 }, + { 0x0e, 0x01, -1, 0x03, 0x1842, 0x000a }, + { 0x0e, 0x01, -1, 0x03, 0x1842, 0x000c }, + { 0x0e, 0x02, -1, 0x03, 0x1842, 0x000e }, + { 0x0e, 0x02, -1, 0x03, 0x1842, 0x0012 }, + { 0x0e, 0x03, -1, 0x03, 0x1842, 0x0016 }, + { 0x0e, 0x03, -1, 0x03, 0x1842, 0x001e }, + { 0x0e, 0x04, -1, 0x03, 0x1842, 0x0026 }, + { 0x0e, 0x04, -1, 0x03, 0x1842, 0x0036 }, + { 0x18, 0x01, -1, 0x03, 0x5842, 0x000a }, + { 0x18, 0x01, -1, 0x03, 0x5842, 0x000c }, + { 0x18, 0x02, -1, 0x03, 0x5842, 0x000e }, + { 0x18, 0x02, -1, 0x03, 0x5842, 0x0012 }, + { 0x18, 0x03, -1, 0x03, 0x5842, 0x0016 }, + { 0x18, 0x03, -1, 0x03, 0x5842, 0x001e }, + { 0x18, 0x04, -1, 0x03, 0x5842, 0x0026 }, + { 0x18, 0x04, -1, 0x03, 0x5842, 0x0036 }, + { 0x06, 0x05, -1, 0x03, 0x0082, 0x0046 }, + { 0x06, 0x05, -1, 0x03, 0x0082, 0x0066 }, + { 0x06, 0x06, -1, 0x03, 0x0082, 0x0086 }, + { 0x06, 0x07, -1, 0x03, 0x0082, 0x00c6 }, + { 0x06, 0x08, -1, 0x03, 0x0082, 0x0146 }, + { 0x06, 0x09, -1, 0x03, 0x0082, 0x0246 }, + { 0x06, 0x0a, -1, 0x03, 0x0082, 0x0446 }, + { 0x06, 0x18, -1, 0x03, 0x0082, 0x0846 }, + { 0x07, 0x05, -1, 0x03, 0x00c2, 0x0046 }, + { 0x07, 0x05, -1, 0x03, 0x00c2, 0x0066 }, + { 0x07, 0x06, -1, 0x03, 0x00c2, 0x0086 }, + { 0x07, 0x07, -1, 0x03, 0x00c2, 0x00c6 }, + { 0x07, 0x08, -1, 0x03, 0x00c2, 0x0146 }, + { 0x07, 0x09, -1, 0x03, 0x00c2, 0x0246 }, + { 0x07, 0x0a, -1, 0x03, 0x00c2, 0x0446 }, + { 0x07, 0x18, -1, 0x03, 0x00c2, 0x0846 }, + { 0x08, 0x05, -1, 0x03, 0x0142, 0x0046 }, + { 0x08, 0x05, -1, 0x03, 0x0142, 0x0066 }, + { 0x08, 0x06, -1, 0x03, 0x0142, 0x0086 }, + { 0x08, 0x07, -1, 0x03, 0x0142, 0x00c6 }, + { 0x08, 0x08, -1, 0x03, 0x0142, 0x0146 }, + { 0x08, 0x09, -1, 0x03, 0x0142, 0x0246 }, + { 0x08, 0x0a, -1, 0x03, 0x0142, 0x0446 }, + { 0x08, 0x18, -1, 0x03, 0x0142, 0x0846 }, + { 0x09, 0x05, -1, 0x03, 0x0242, 0x0046 }, + { 0x09, 0x05, -1, 0x03, 0x0242, 0x0066 }, + { 0x09, 0x06, -1, 0x03, 0x0242, 0x0086 }, + { 0x09, 0x07, -1, 0x03, 0x0242, 0x00c6 }, + { 0x09, 0x08, -1, 0x03, 0x0242, 0x0146 }, + { 0x09, 0x09, -1, 0x03, 0x0242, 0x0246 }, + { 0x09, 0x0a, -1, 0x03, 0x0242, 0x0446 }, + { 0x09, 0x18, -1, 0x03, 0x0242, 0x0846 }, + { 0x0a, 0x05, -1, 0x03, 0x0442, 0x0046 }, + { 0x0a, 0x05, -1, 0x03, 0x0442, 0x0066 }, + { 0x0a, 0x06, -1, 0x03, 0x0442, 0x0086 }, + { 0x0a, 0x07, -1, 0x03, 0x0442, 0x00c6 }, + { 0x0a, 0x08, -1, 0x03, 0x0442, 0x0146 }, + { 0x0a, 0x09, -1, 0x03, 0x0442, 0x0246 }, + { 0x0a, 0x0a, -1, 0x03, 0x0442, 0x0446 }, + { 0x0a, 0x18, -1, 0x03, 0x0442, 0x0846 }, + { 0x0c, 0x05, -1, 0x03, 0x0842, 0x0046 }, + { 0x0c, 0x05, -1, 0x03, 0x0842, 0x0066 }, + { 0x0c, 0x06, -1, 0x03, 0x0842, 0x0086 }, + { 0x0c, 0x07, -1, 0x03, 0x0842, 0x00c6 }, + { 0x0c, 0x08, -1, 0x03, 0x0842, 0x0146 }, + { 0x0c, 0x09, -1, 0x03, 0x0842, 0x0246 }, + { 0x0c, 0x0a, -1, 0x03, 0x0842, 0x0446 }, + { 0x0c, 0x18, -1, 0x03, 0x0842, 0x0846 }, + { 0x0e, 0x05, -1, 0x03, 0x1842, 0x0046 }, + { 0x0e, 0x05, -1, 0x03, 0x1842, 0x0066 }, + { 0x0e, 0x06, -1, 0x03, 0x1842, 0x0086 }, + { 0x0e, 0x07, -1, 0x03, 0x1842, 0x00c6 }, + { 0x0e, 0x08, -1, 0x03, 0x1842, 0x0146 }, + { 0x0e, 0x09, -1, 0x03, 0x1842, 0x0246 }, + { 0x0e, 0x0a, -1, 0x03, 0x1842, 0x0446 }, + { 0x0e, 0x18, -1, 0x03, 0x1842, 0x0846 }, + { 0x18, 0x05, -1, 0x03, 0x5842, 0x0046 }, + { 0x18, 0x05, -1, 0x03, 0x5842, 0x0066 }, + { 0x18, 0x06, -1, 0x03, 0x5842, 0x0086 }, + { 0x18, 0x07, -1, 0x03, 0x5842, 0x00c6 }, + { 0x18, 0x08, -1, 0x03, 0x5842, 0x0146 }, + { 0x18, 0x09, -1, 0x03, 0x5842, 0x0246 }, + { 0x18, 0x0a, -1, 0x03, 0x5842, 0x0446 }, + { 0x18, 0x18, -1, 0x03, 0x5842, 0x0846 }, +}; + +#endif /* BROTLI_DEC_PREFIX_H_ */ diff --git a/modules/brotli/dec/state.c b/modules/brotli/dec/state.c new file mode 100644 index 0000000000..be6a26680b --- /dev/null +++ b/modules/brotli/dec/state.c @@ -0,0 +1,183 @@ +/* Copyright 2015 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +#include "state.h" + +#include <stdlib.h> /* free, malloc */ + +#include <brotli/types.h> + +#include "../common/dictionary.h" +#include "huffman.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +BROTLI_BOOL BrotliDecoderStateInit(BrotliDecoderState* s, + brotli_alloc_func alloc_func, brotli_free_func free_func, void* opaque) { + if (!alloc_func) { + s->alloc_func = BrotliDefaultAllocFunc; + s->free_func = BrotliDefaultFreeFunc; + s->memory_manager_opaque = 0; + } else { + s->alloc_func = alloc_func; + s->free_func = free_func; + s->memory_manager_opaque = opaque; + } + + s->error_code = 0; /* BROTLI_DECODER_NO_ERROR */ + + BrotliInitBitReader(&s->br); + s->state = BROTLI_STATE_UNINITED; + s->large_window = 0; + s->substate_metablock_header = BROTLI_STATE_METABLOCK_HEADER_NONE; + s->substate_uncompressed = BROTLI_STATE_UNCOMPRESSED_NONE; + s->substate_decode_uint8 = BROTLI_STATE_DECODE_UINT8_NONE; + s->substate_read_block_length = BROTLI_STATE_READ_BLOCK_LENGTH_NONE; + + s->buffer_length = 0; + s->loop_counter = 0; + s->pos = 0; + s->rb_roundtrips = 0; + s->partial_pos_out = 0; + s->used_input = 0; + + s->block_type_trees = NULL; + s->block_len_trees = NULL; + s->ringbuffer = NULL; + s->ringbuffer_size = 0; + s->new_ringbuffer_size = 0; + s->ringbuffer_mask = 0; + + s->context_map = NULL; + s->context_modes = NULL; + s->dist_context_map = NULL; + s->context_map_slice = NULL; + s->dist_context_map_slice = NULL; + + s->literal_hgroup.codes = NULL; + s->literal_hgroup.htrees = NULL; + s->insert_copy_hgroup.codes = NULL; + s->insert_copy_hgroup.htrees = NULL; + s->distance_hgroup.codes = NULL; + s->distance_hgroup.htrees = NULL; + + s->is_last_metablock = 0; + s->is_uncompressed = 0; + s->is_metadata = 0; + s->should_wrap_ringbuffer = 0; + s->canny_ringbuffer_allocation = 1; + + s->window_bits = 0; + s->max_distance = 0; + s->dist_rb[0] = 16; + s->dist_rb[1] = 15; + s->dist_rb[2] = 11; + s->dist_rb[3] = 4; + s->dist_rb_idx = 0; + s->block_type_trees = NULL; + s->block_len_trees = NULL; + + s->mtf_upper_bound = 63; + + s->compound_dictionary = NULL; + s->dictionary = + BrotliSharedDictionaryCreateInstance(alloc_func, free_func, opaque); + if (!s->dictionary) return BROTLI_FALSE; + + s->metadata_start_func = NULL; + s->metadata_chunk_func = NULL; + s->metadata_callback_opaque = 0; + + return BROTLI_TRUE; +} + +void BrotliDecoderStateMetablockBegin(BrotliDecoderState* s) { + s->meta_block_remaining_len = 0; + s->block_length[0] = BROTLI_BLOCK_SIZE_CAP; + s->block_length[1] = BROTLI_BLOCK_SIZE_CAP; + s->block_length[2] = BROTLI_BLOCK_SIZE_CAP; + s->num_block_types[0] = 1; + s->num_block_types[1] = 1; + s->num_block_types[2] = 1; + s->block_type_rb[0] = 1; + s->block_type_rb[1] = 0; + s->block_type_rb[2] = 1; + s->block_type_rb[3] = 0; + s->block_type_rb[4] = 1; + s->block_type_rb[5] = 0; + s->context_map = NULL; + s->context_modes = NULL; + s->dist_context_map = NULL; + s->context_map_slice = NULL; + s->literal_htree = NULL; + s->dist_context_map_slice = NULL; + s->dist_htree_index = 0; + s->context_lookup = NULL; + s->literal_hgroup.codes = NULL; + s->literal_hgroup.htrees = NULL; + s->insert_copy_hgroup.codes = NULL; + s->insert_copy_hgroup.htrees = NULL; + s->distance_hgroup.codes = NULL; + s->distance_hgroup.htrees = NULL; +} + +void BrotliDecoderStateCleanupAfterMetablock(BrotliDecoderState* s) { + BROTLI_DECODER_FREE(s, s->context_modes); + BROTLI_DECODER_FREE(s, s->context_map); + BROTLI_DECODER_FREE(s, s->dist_context_map); + BROTLI_DECODER_FREE(s, s->literal_hgroup.htrees); + BROTLI_DECODER_FREE(s, s->insert_copy_hgroup.htrees); + BROTLI_DECODER_FREE(s, s->distance_hgroup.htrees); +} + +#ifdef BROTLI_REPORTING +/* When BROTLI_REPORTING is defined extra reporting module have to be linked. */ +void BrotliDecoderOnFinish(const BrotliDecoderState* s); +#define BROTLI_DECODER_ON_FINISH(s) BrotliDecoderOnFinish(s); +#else +#if !defined(BROTLI_DECODER_ON_FINISH) +#define BROTLI_DECODER_ON_FINISH(s) (void)(s); +#endif +#endif + +void BrotliDecoderStateCleanup(BrotliDecoderState* s) { + BrotliDecoderStateCleanupAfterMetablock(s); + + BROTLI_DECODER_ON_FINISH(s); + + BROTLI_DECODER_FREE(s, s->compound_dictionary); + BrotliSharedDictionaryDestroyInstance(s->dictionary); + s->dictionary = NULL; + BROTLI_DECODER_FREE(s, s->ringbuffer); + BROTLI_DECODER_FREE(s, s->block_type_trees); +} + +BROTLI_BOOL BrotliDecoderHuffmanTreeGroupInit(BrotliDecoderState* s, + HuffmanTreeGroup* group, brotli_reg_t alphabet_size_max, + brotli_reg_t alphabet_size_limit, brotli_reg_t ntrees) { + /* 376 = 256 (1-st level table) + 4 + 7 + 15 + 31 + 63 (2-nd level mix-tables) + This number is discovered "unlimited" "enough" calculator; it is actually + a wee bigger than required in several cases (especially for alphabets with + less than 16 symbols). */ + const size_t max_table_size = alphabet_size_limit + 376; + const size_t code_size = sizeof(HuffmanCode) * ntrees * max_table_size; + const size_t htree_size = sizeof(HuffmanCode*) * ntrees; + /* Pointer alignment is, hopefully, wider than sizeof(HuffmanCode). */ + HuffmanCode** p = (HuffmanCode**)BROTLI_DECODER_ALLOC(s, + code_size + htree_size); + group->alphabet_size_max = (uint16_t)alphabet_size_max; + group->alphabet_size_limit = (uint16_t)alphabet_size_limit; + group->num_htrees = (uint16_t)ntrees; + group->htrees = p; + group->codes = (HuffmanCode*)(&p[ntrees]); + return !!p; +} + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif diff --git a/modules/brotli/dec/state.h b/modules/brotli/dec/state.h new file mode 100644 index 0000000000..fd250b6842 --- /dev/null +++ b/modules/brotli/dec/state.h @@ -0,0 +1,400 @@ +/* Copyright 2015 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Brotli state for partial streaming decoding. */ + +#ifndef BROTLI_DEC_STATE_H_ +#define BROTLI_DEC_STATE_H_ + +#include <brotli/decode.h> +#include <brotli/shared_dictionary.h> +#include <brotli/types.h> + +#include "../common/constants.h" +#include "../common/dictionary.h" +#include "../common/platform.h" +#include "../common/transform.h" +#include "bit_reader.h" +#include "huffman.h" + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +/* Graphviz diagram that describes state transitions: + +digraph States { + graph [compound=true] + concentrate=true + node [shape="box"] + + UNINITED -> {LARGE_WINDOW_BITS -> INITIALIZE} + subgraph cluster_metablock_workflow { + style="rounded" + label=< <B>METABLOCK CYCLE</B> > + METABLOCK_BEGIN -> METABLOCK_HEADER + METABLOCK_HEADER:sw -> METADATA + METABLOCK_HEADER:s -> UNCOMPRESSED + METABLOCK_HEADER:se -> METABLOCK_DONE:ne + METADATA:s -> METABLOCK_DONE:w + UNCOMPRESSED:s -> METABLOCK_DONE:n + METABLOCK_DONE:e -> METABLOCK_BEGIN:e [constraint="false"] + } + INITIALIZE -> METABLOCK_BEGIN + METABLOCK_DONE -> DONE + + subgraph cluster_compressed_metablock { + style="rounded" + label=< <B>COMPRESSED METABLOCK</B> > + + subgraph cluster_command { + style="rounded" + label=< <B>HOT LOOP</B> > + + _METABLOCK_DONE_PORT_ [shape=point style=invis] + + { + // Set different shape for nodes returning from "compressed metablock". + node [shape=invhouse]; CMD_INNER CMD_POST_DECODE_LITERALS; + CMD_POST_WRAP_COPY; CMD_INNER_WRITE; CMD_POST_WRITE_1; + } + + CMD_BEGIN -> CMD_INNER -> CMD_POST_DECODE_LITERALS -> CMD_POST_WRAP_COPY + + // IO ("write") nodes are not in the hot loop! + CMD_INNER_WRITE [style=dashed] + CMD_INNER -> CMD_INNER_WRITE + CMD_POST_WRITE_1 [style=dashed] + CMD_POST_DECODE_LITERALS -> CMD_POST_WRITE_1 + CMD_POST_WRITE_2 [style=dashed] + CMD_POST_WRAP_COPY -> CMD_POST_WRITE_2 + + CMD_POST_WRITE_1 -> CMD_BEGIN:s [constraint="false"] + CMD_INNER_WRITE -> {CMD_INNER CMD_POST_DECODE_LITERALS} + [constraint="false"] + CMD_BEGIN:ne -> CMD_POST_DECODE_LITERALS [constraint="false"] + CMD_POST_WRAP_COPY -> CMD_BEGIN [constraint="false"] + CMD_POST_DECODE_LITERALS -> CMD_BEGIN:ne [constraint="false"] + CMD_POST_WRITE_2 -> CMD_POST_WRAP_COPY [constraint="false"] + {rank=same; CMD_BEGIN; CMD_INNER; CMD_POST_DECODE_LITERALS; + CMD_POST_WRAP_COPY} + {rank=same; CMD_INNER_WRITE; CMD_POST_WRITE_1; CMD_POST_WRITE_2} + + {CMD_INNER CMD_POST_DECODE_LITERALS CMD_POST_WRAP_COPY} -> + _METABLOCK_DONE_PORT_ [style=invis] + {CMD_INNER_WRITE CMD_POST_WRITE_1} -> _METABLOCK_DONE_PORT_ + [constraint="false" style=invis] + } + + BEFORE_COMPRESSED_METABLOCK_HEADER:s -> HUFFMAN_CODE_0:n + HUFFMAN_CODE_0 -> HUFFMAN_CODE_1 -> HUFFMAN_CODE_2 -> HUFFMAN_CODE_3 + HUFFMAN_CODE_0 -> METABLOCK_HEADER_2 -> CONTEXT_MODES -> CONTEXT_MAP_1 + CONTEXT_MAP_1 -> CONTEXT_MAP_2 -> TREE_GROUP + TREE_GROUP -> BEFORE_COMPRESSED_METABLOCK_BODY:e + BEFORE_COMPRESSED_METABLOCK_BODY:s -> CMD_BEGIN:n + + HUFFMAN_CODE_3:e -> HUFFMAN_CODE_0:ne [constraint="false"] + {rank=same; HUFFMAN_CODE_0; HUFFMAN_CODE_1; HUFFMAN_CODE_2; HUFFMAN_CODE_3} + {rank=same; METABLOCK_HEADER_2; CONTEXT_MODES; CONTEXT_MAP_1; CONTEXT_MAP_2; + TREE_GROUP} + } + METABLOCK_HEADER:e -> BEFORE_COMPRESSED_METABLOCK_HEADER:n + + _METABLOCK_DONE_PORT_ -> METABLOCK_DONE:se + [constraint="false" ltail=cluster_command] + + UNINITED [shape=Mdiamond]; + DONE [shape=Msquare]; +} + + + */ + +typedef enum { + BROTLI_STATE_UNINITED, + BROTLI_STATE_LARGE_WINDOW_BITS, + BROTLI_STATE_INITIALIZE, + BROTLI_STATE_METABLOCK_BEGIN, + BROTLI_STATE_METABLOCK_HEADER, + BROTLI_STATE_METABLOCK_HEADER_2, + BROTLI_STATE_CONTEXT_MODES, + BROTLI_STATE_COMMAND_BEGIN, + BROTLI_STATE_COMMAND_INNER, + BROTLI_STATE_COMMAND_POST_DECODE_LITERALS, + BROTLI_STATE_COMMAND_POST_WRAP_COPY, + BROTLI_STATE_UNCOMPRESSED, + BROTLI_STATE_METADATA, + BROTLI_STATE_COMMAND_INNER_WRITE, + BROTLI_STATE_METABLOCK_DONE, + BROTLI_STATE_COMMAND_POST_WRITE_1, + BROTLI_STATE_COMMAND_POST_WRITE_2, + BROTLI_STATE_BEFORE_COMPRESSED_METABLOCK_HEADER, + BROTLI_STATE_HUFFMAN_CODE_0, + BROTLI_STATE_HUFFMAN_CODE_1, + BROTLI_STATE_HUFFMAN_CODE_2, + BROTLI_STATE_HUFFMAN_CODE_3, + BROTLI_STATE_CONTEXT_MAP_1, + BROTLI_STATE_CONTEXT_MAP_2, + BROTLI_STATE_TREE_GROUP, + BROTLI_STATE_BEFORE_COMPRESSED_METABLOCK_BODY, + BROTLI_STATE_DONE +} BrotliRunningState; + +typedef enum { + BROTLI_STATE_METABLOCK_HEADER_NONE, + BROTLI_STATE_METABLOCK_HEADER_EMPTY, + BROTLI_STATE_METABLOCK_HEADER_NIBBLES, + BROTLI_STATE_METABLOCK_HEADER_SIZE, + BROTLI_STATE_METABLOCK_HEADER_UNCOMPRESSED, + BROTLI_STATE_METABLOCK_HEADER_RESERVED, + BROTLI_STATE_METABLOCK_HEADER_BYTES, + BROTLI_STATE_METABLOCK_HEADER_METADATA +} BrotliRunningMetablockHeaderState; + +typedef enum { + BROTLI_STATE_UNCOMPRESSED_NONE, + BROTLI_STATE_UNCOMPRESSED_WRITE +} BrotliRunningUncompressedState; + +typedef enum { + BROTLI_STATE_TREE_GROUP_NONE, + BROTLI_STATE_TREE_GROUP_LOOP +} BrotliRunningTreeGroupState; + +typedef enum { + BROTLI_STATE_CONTEXT_MAP_NONE, + BROTLI_STATE_CONTEXT_MAP_READ_PREFIX, + BROTLI_STATE_CONTEXT_MAP_HUFFMAN, + BROTLI_STATE_CONTEXT_MAP_DECODE, + BROTLI_STATE_CONTEXT_MAP_TRANSFORM +} BrotliRunningContextMapState; + +typedef enum { + BROTLI_STATE_HUFFMAN_NONE, + BROTLI_STATE_HUFFMAN_SIMPLE_SIZE, + BROTLI_STATE_HUFFMAN_SIMPLE_READ, + BROTLI_STATE_HUFFMAN_SIMPLE_BUILD, + BROTLI_STATE_HUFFMAN_COMPLEX, + BROTLI_STATE_HUFFMAN_LENGTH_SYMBOLS +} BrotliRunningHuffmanState; + +typedef enum { + BROTLI_STATE_DECODE_UINT8_NONE, + BROTLI_STATE_DECODE_UINT8_SHORT, + BROTLI_STATE_DECODE_UINT8_LONG +} BrotliRunningDecodeUint8State; + +typedef enum { + BROTLI_STATE_READ_BLOCK_LENGTH_NONE, + BROTLI_STATE_READ_BLOCK_LENGTH_SUFFIX +} BrotliRunningReadBlockLengthState; + +/* BrotliDecoderState addon, used for Compound Dictionary functionality. */ +typedef struct BrotliDecoderCompoundDictionary { + int num_chunks; + int total_size; + int br_index; + int br_offset; + int br_length; + int br_copied; + const uint8_t* chunks[16]; + int chunk_offsets[16]; + int block_bits; + uint8_t block_map[256]; +} BrotliDecoderCompoundDictionary; + +typedef struct BrotliMetablockHeaderArena { + BrotliRunningTreeGroupState substate_tree_group; + BrotliRunningContextMapState substate_context_map; + BrotliRunningHuffmanState substate_huffman; + + brotli_reg_t sub_loop_counter; + + brotli_reg_t repeat_code_len; + brotli_reg_t prev_code_len; + + /* For ReadHuffmanCode. */ + brotli_reg_t symbol; + brotli_reg_t repeat; + brotli_reg_t space; + + /* Huffman table for "histograms". */ + HuffmanCode table[32]; + /* List of heads of symbol chains. */ + uint16_t* symbol_lists; + /* Storage from symbol_lists. */ + uint16_t symbols_lists_array[BROTLI_HUFFMAN_MAX_CODE_LENGTH + 1 + + BROTLI_NUM_COMMAND_SYMBOLS]; + /* Tails of symbol chains. */ + int next_symbol[32]; + uint8_t code_length_code_lengths[BROTLI_CODE_LENGTH_CODES]; + /* Population counts for the code lengths. */ + uint16_t code_length_histo[16]; + /* TODO(eustas): +2 bytes padding */ + + /* For HuffmanTreeGroupDecode. */ + int htree_index; + HuffmanCode* next; + + /* For DecodeContextMap. */ + brotli_reg_t context_index; + brotli_reg_t max_run_length_prefix; + brotli_reg_t code; + HuffmanCode context_map_table[BROTLI_HUFFMAN_MAX_SIZE_272]; +} BrotliMetablockHeaderArena; + +typedef struct BrotliMetablockBodyArena { + uint8_t dist_extra_bits[544]; + brotli_reg_t dist_offset[544]; +} BrotliMetablockBodyArena; + +struct BrotliDecoderStateStruct { + BrotliRunningState state; + + /* This counter is reused for several disjoint loops. */ + int loop_counter; + + BrotliBitReader br; + + brotli_alloc_func alloc_func; + brotli_free_func free_func; + void* memory_manager_opaque; + + /* Temporary storage for remaining input. Brotli stream format is designed in + a way, that 64 bits are enough to make progress in decoding. */ + union { + uint64_t u64; + uint8_t u8[8]; + } buffer; + brotli_reg_t buffer_length; + + int pos; + int max_backward_distance; + int max_distance; + int ringbuffer_size; + int ringbuffer_mask; + int dist_rb_idx; + int dist_rb[4]; + int error_code; + int meta_block_remaining_len; + + uint8_t* ringbuffer; + uint8_t* ringbuffer_end; + HuffmanCode* htree_command; + const uint8_t* context_lookup; + uint8_t* context_map_slice; + uint8_t* dist_context_map_slice; + + /* This ring buffer holds a few past copy distances that will be used by + some special distance codes. */ + HuffmanTreeGroup literal_hgroup; + HuffmanTreeGroup insert_copy_hgroup; + HuffmanTreeGroup distance_hgroup; + HuffmanCode* block_type_trees; + HuffmanCode* block_len_trees; + /* This is true if the literal context map histogram type always matches the + block type. It is then not needed to keep the context (faster decoding). */ + int trivial_literal_context; + /* Distance context is actual after command is decoded and before distance is + computed. After distance computation it is used as a temporary variable. */ + int distance_context; + brotli_reg_t block_length[3]; + brotli_reg_t block_length_index; + brotli_reg_t num_block_types[3]; + brotli_reg_t block_type_rb[6]; + brotli_reg_t distance_postfix_bits; + brotli_reg_t num_direct_distance_codes; + brotli_reg_t num_dist_htrees; + uint8_t* dist_context_map; + HuffmanCode* literal_htree; + + /* For partial write operations. */ + size_t rb_roundtrips; /* how many times we went around the ring-buffer */ + size_t partial_pos_out; /* how much output to the user in total */ + + /* For InverseMoveToFrontTransform. */ + brotli_reg_t mtf_upper_bound; + uint32_t mtf[64 + 1]; + + int copy_length; + int distance_code; + + uint8_t dist_htree_index; + /* TODO(eustas): +3 bytes padding */ + + /* Less used attributes are at the end of this struct. */ + + brotli_decoder_metadata_start_func metadata_start_func; + brotli_decoder_metadata_chunk_func metadata_chunk_func; + void* metadata_callback_opaque; + + /* For reporting. */ + uint64_t used_input; /* how many bytes of input are consumed */ + + /* States inside function calls. */ + BrotliRunningMetablockHeaderState substate_metablock_header; + BrotliRunningUncompressedState substate_uncompressed; + BrotliRunningDecodeUint8State substate_decode_uint8; + BrotliRunningReadBlockLengthState substate_read_block_length; + + int new_ringbuffer_size; + /* TODO(eustas): +4 bytes padding */ + + unsigned int is_last_metablock : 1; + unsigned int is_uncompressed : 1; + unsigned int is_metadata : 1; + unsigned int should_wrap_ringbuffer : 1; + unsigned int canny_ringbuffer_allocation : 1; + unsigned int large_window : 1; + unsigned int window_bits : 6; + unsigned int size_nibbles : 8; + /* TODO(eustas): +12 bits padding */ + + brotli_reg_t num_literal_htrees; + uint8_t* context_map; + uint8_t* context_modes; + + BrotliSharedDictionary* dictionary; + BrotliDecoderCompoundDictionary* compound_dictionary; + + uint32_t trivial_literal_contexts[8]; /* 256 bits */ + + union { + BrotliMetablockHeaderArena header; + BrotliMetablockBodyArena body; + } arena; +}; + +typedef struct BrotliDecoderStateStruct BrotliDecoderStateInternal; +#define BrotliDecoderState BrotliDecoderStateInternal + +BROTLI_INTERNAL BROTLI_BOOL BrotliDecoderStateInit(BrotliDecoderState* s, + brotli_alloc_func alloc_func, brotli_free_func free_func, void* opaque); +BROTLI_INTERNAL void BrotliDecoderStateCleanup(BrotliDecoderState* s); +BROTLI_INTERNAL void BrotliDecoderStateMetablockBegin(BrotliDecoderState* s); +BROTLI_INTERNAL void BrotliDecoderStateCleanupAfterMetablock( + BrotliDecoderState* s); +BROTLI_INTERNAL BROTLI_BOOL BrotliDecoderHuffmanTreeGroupInit( + BrotliDecoderState* s, HuffmanTreeGroup* group, + brotli_reg_t alphabet_size_max, brotli_reg_t alphabet_size_limit, + brotli_reg_t ntrees); + +#define BROTLI_DECODER_ALLOC(S, L) S->alloc_func(S->memory_manager_opaque, L) + +#define BROTLI_DECODER_FREE(S, X) { \ + S->free_func(S->memory_manager_opaque, X); \ + X = NULL; \ +} + +/* Literal/Command/Distance block size maximum; same as maximum metablock size; + used as block size when there is no block switching. */ +#define BROTLI_BLOCK_SIZE_CAP (1U << 24) + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_DEC_STATE_H_ */ diff --git a/modules/brotli/include/brotli/decode.h b/modules/brotli/include/brotli/decode.h new file mode 100644 index 0000000000..af1aa23f60 --- /dev/null +++ b/modules/brotli/include/brotli/decode.h @@ -0,0 +1,409 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/** + * @file + * API for Brotli decompression. + */ + +#ifndef BROTLI_DEC_DECODE_H_ +#define BROTLI_DEC_DECODE_H_ + +#include <brotli/port.h> +#include <brotli/shared_dictionary.h> +#include <brotli/types.h> + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +/** + * Opaque structure that holds decoder state. + * + * Allocated and initialized with ::BrotliDecoderCreateInstance. + * Cleaned up and deallocated with ::BrotliDecoderDestroyInstance. + */ +typedef struct BrotliDecoderStateStruct BrotliDecoderState; + +/** + * Result type for ::BrotliDecoderDecompress and + * ::BrotliDecoderDecompressStream functions. + */ +typedef enum { + /** Decoding error, e.g. corrupted input or memory allocation problem. */ + BROTLI_DECODER_RESULT_ERROR = 0, + /** Decoding successfully completed. */ + BROTLI_DECODER_RESULT_SUCCESS = 1, + /** Partially done; should be called again with more input. */ + BROTLI_DECODER_RESULT_NEEDS_MORE_INPUT = 2, + /** Partially done; should be called again with more output. */ + BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT = 3 +} BrotliDecoderResult; + +/** + * Template that evaluates items of ::BrotliDecoderErrorCode. + * + * Example: @code {.cpp} + * // Log Brotli error code. + * switch (brotliDecoderErrorCode) { + * #define CASE_(PREFIX, NAME, CODE) \ + * case BROTLI_DECODER ## PREFIX ## NAME: \ + * LOG(INFO) << "error code:" << #NAME; \ + * break; + * #define NEWLINE_ + * BROTLI_DECODER_ERROR_CODES_LIST(CASE_, NEWLINE_) + * #undef CASE_ + * #undef NEWLINE_ + * default: LOG(FATAL) << "unknown brotli error code"; + * } + * @endcode + */ +#define BROTLI_DECODER_ERROR_CODES_LIST(BROTLI_ERROR_CODE, SEPARATOR) \ + BROTLI_ERROR_CODE(_, NO_ERROR, 0) SEPARATOR \ + /* Same as BrotliDecoderResult values */ \ + BROTLI_ERROR_CODE(_, SUCCESS, 1) SEPARATOR \ + BROTLI_ERROR_CODE(_, NEEDS_MORE_INPUT, 2) SEPARATOR \ + BROTLI_ERROR_CODE(_, NEEDS_MORE_OUTPUT, 3) SEPARATOR \ + \ + /* Errors caused by invalid input */ \ + BROTLI_ERROR_CODE(_ERROR_FORMAT_, EXUBERANT_NIBBLE, -1) SEPARATOR \ + BROTLI_ERROR_CODE(_ERROR_FORMAT_, RESERVED, -2) SEPARATOR \ + BROTLI_ERROR_CODE(_ERROR_FORMAT_, EXUBERANT_META_NIBBLE, -3) SEPARATOR \ + BROTLI_ERROR_CODE(_ERROR_FORMAT_, SIMPLE_HUFFMAN_ALPHABET, -4) SEPARATOR \ + BROTLI_ERROR_CODE(_ERROR_FORMAT_, SIMPLE_HUFFMAN_SAME, -5) SEPARATOR \ + BROTLI_ERROR_CODE(_ERROR_FORMAT_, CL_SPACE, -6) SEPARATOR \ + BROTLI_ERROR_CODE(_ERROR_FORMAT_, HUFFMAN_SPACE, -7) SEPARATOR \ + BROTLI_ERROR_CODE(_ERROR_FORMAT_, CONTEXT_MAP_REPEAT, -8) SEPARATOR \ + BROTLI_ERROR_CODE(_ERROR_FORMAT_, BLOCK_LENGTH_1, -9) SEPARATOR \ + BROTLI_ERROR_CODE(_ERROR_FORMAT_, BLOCK_LENGTH_2, -10) SEPARATOR \ + BROTLI_ERROR_CODE(_ERROR_FORMAT_, TRANSFORM, -11) SEPARATOR \ + BROTLI_ERROR_CODE(_ERROR_FORMAT_, DICTIONARY, -12) SEPARATOR \ + BROTLI_ERROR_CODE(_ERROR_FORMAT_, WINDOW_BITS, -13) SEPARATOR \ + BROTLI_ERROR_CODE(_ERROR_FORMAT_, PADDING_1, -14) SEPARATOR \ + BROTLI_ERROR_CODE(_ERROR_FORMAT_, PADDING_2, -15) SEPARATOR \ + BROTLI_ERROR_CODE(_ERROR_FORMAT_, DISTANCE, -16) SEPARATOR \ + \ + /* -17 code is reserved */ \ + \ + BROTLI_ERROR_CODE(_ERROR_, COMPOUND_DICTIONARY, -18) SEPARATOR \ + BROTLI_ERROR_CODE(_ERROR_, DICTIONARY_NOT_SET, -19) SEPARATOR \ + BROTLI_ERROR_CODE(_ERROR_, INVALID_ARGUMENTS, -20) SEPARATOR \ + \ + /* Memory allocation problems */ \ + BROTLI_ERROR_CODE(_ERROR_ALLOC_, CONTEXT_MODES, -21) SEPARATOR \ + /* Literal, insert and distance trees together */ \ + BROTLI_ERROR_CODE(_ERROR_ALLOC_, TREE_GROUPS, -22) SEPARATOR \ + /* -23..-24 codes are reserved for distinct tree groups */ \ + BROTLI_ERROR_CODE(_ERROR_ALLOC_, CONTEXT_MAP, -25) SEPARATOR \ + BROTLI_ERROR_CODE(_ERROR_ALLOC_, RING_BUFFER_1, -26) SEPARATOR \ + BROTLI_ERROR_CODE(_ERROR_ALLOC_, RING_BUFFER_2, -27) SEPARATOR \ + /* -28..-29 codes are reserved for dynamic ring-buffer allocation */ \ + BROTLI_ERROR_CODE(_ERROR_ALLOC_, BLOCK_TYPE_TREES, -30) SEPARATOR \ + \ + /* "Impossible" states */ \ + BROTLI_ERROR_CODE(_ERROR_, UNREACHABLE, -31) + +/** + * Error code for detailed logging / production debugging. + * + * See ::BrotliDecoderGetErrorCode and ::BROTLI_LAST_ERROR_CODE. + */ +typedef enum { +#define BROTLI_COMMA_ , +#define BROTLI_ERROR_CODE_ENUM_ITEM_(PREFIX, NAME, CODE) \ + BROTLI_DECODER ## PREFIX ## NAME = CODE + BROTLI_DECODER_ERROR_CODES_LIST(BROTLI_ERROR_CODE_ENUM_ITEM_, BROTLI_COMMA_) +} BrotliDecoderErrorCode; +#undef BROTLI_ERROR_CODE_ENUM_ITEM_ +#undef BROTLI_COMMA_ + +/** + * The value of the last error code, negative integer. + * + * All other error code values are in the range from ::BROTLI_LAST_ERROR_CODE + * to @c -1. There are also 4 other possible non-error codes @c 0 .. @c 3 in + * ::BrotliDecoderErrorCode enumeration. + */ +#define BROTLI_LAST_ERROR_CODE BROTLI_DECODER_ERROR_UNREACHABLE + +/** Options to be used with ::BrotliDecoderSetParameter. */ +typedef enum BrotliDecoderParameter { + /** + * Disable "canny" ring buffer allocation strategy. + * + * Ring buffer is allocated according to window size, despite the real size of + * the content. + */ + BROTLI_DECODER_PARAM_DISABLE_RING_BUFFER_REALLOCATION = 0, + /** + * Flag that determines if "Large Window Brotli" is used. + */ + BROTLI_DECODER_PARAM_LARGE_WINDOW = 1 +} BrotliDecoderParameter; + +/** + * Sets the specified parameter to the given decoder instance. + * + * @param state decoder instance + * @param param parameter to set + * @param value new parameter value + * @returns ::BROTLI_FALSE if parameter is unrecognized, or value is invalid + * @returns ::BROTLI_TRUE if value is accepted + */ +BROTLI_DEC_API BROTLI_BOOL BrotliDecoderSetParameter( + BrotliDecoderState* state, BrotliDecoderParameter param, uint32_t value); + +/** + * Adds LZ77 prefix dictionary, adds or replaces built-in static dictionary and + * transforms. + * + * Attached dictionary ownership is not transferred. + * Data provided to this method should be kept accessible until + * decoding is finished and decoder instance is destroyed. + * + * @note Dictionaries can NOT be attached after actual decoding is started. + * + * @param state decoder instance + * @param type dictionary data format + * @param data_size length of memory region pointed by @p data + * @param data dictionary data in format corresponding to @p type + * @returns ::BROTLI_FALSE if dictionary is corrupted, + * or dictionary count limit is reached + * @returns ::BROTLI_TRUE if dictionary is accepted / attached + */ +BROTLI_DEC_API BROTLI_BOOL BrotliDecoderAttachDictionary( + BrotliDecoderState* state, BrotliSharedDictionaryType type, + size_t data_size, const uint8_t data[BROTLI_ARRAY_PARAM(data_size)]); + +/** + * Creates an instance of ::BrotliDecoderState and initializes it. + * + * The instance can be used once for decoding and should then be destroyed with + * ::BrotliDecoderDestroyInstance, it cannot be reused for a new decoding + * session. + * + * @p alloc_func and @p free_func @b MUST be both zero or both non-zero. In the + * case they are both zero, default memory allocators are used. @p opaque is + * passed to @p alloc_func and @p free_func when they are called. @p free_func + * has to return without doing anything when asked to free a NULL pointer. + * + * @param alloc_func custom memory allocation function + * @param free_func custom memory free function + * @param opaque custom memory manager handle + * @returns @c 0 if instance can not be allocated or initialized + * @returns pointer to initialized ::BrotliDecoderState otherwise + */ +BROTLI_DEC_API BrotliDecoderState* BrotliDecoderCreateInstance( + brotli_alloc_func alloc_func, brotli_free_func free_func, void* opaque); + +/** + * Deinitializes and frees ::BrotliDecoderState instance. + * + * @param state decoder instance to be cleaned up and deallocated + */ +BROTLI_DEC_API void BrotliDecoderDestroyInstance(BrotliDecoderState* state); + +/** + * Performs one-shot memory-to-memory decompression. + * + * Decompresses the data in @p encoded_buffer into @p decoded_buffer, and sets + * @p *decoded_size to the decompressed length. + * + * @param encoded_size size of @p encoded_buffer + * @param encoded_buffer compressed data buffer with at least @p encoded_size + * addressable bytes + * @param[in, out] decoded_size @b in: size of @p decoded_buffer; \n + * @b out: length of decompressed data written to + * @p decoded_buffer + * @param decoded_buffer decompressed data destination buffer + * @returns ::BROTLI_DECODER_RESULT_ERROR if input is corrupted, memory + * allocation failed, or @p decoded_buffer is not large enough; + * @returns ::BROTLI_DECODER_RESULT_SUCCESS otherwise + */ +BROTLI_DEC_API BrotliDecoderResult BrotliDecoderDecompress( + size_t encoded_size, + const uint8_t encoded_buffer[BROTLI_ARRAY_PARAM(encoded_size)], + size_t* decoded_size, + uint8_t decoded_buffer[BROTLI_ARRAY_PARAM(*decoded_size)]); + +/** + * Decompresses the input stream to the output stream. + * + * The values @p *available_in and @p *available_out must specify the number of + * bytes addressable at @p *next_in and @p *next_out respectively. + * When @p *available_out is @c 0, @p next_out is allowed to be @c NULL. + * + * After each call, @p *available_in will be decremented by the amount of input + * bytes consumed, and the @p *next_in pointer will be incremented by that + * amount. Similarly, @p *available_out will be decremented by the amount of + * output bytes written, and the @p *next_out pointer will be incremented by + * that amount. + * + * @p total_out, if it is not a null-pointer, will be set to the number + * of bytes decompressed since the last @p state initialization. + * + * @note Input is never overconsumed, so @p next_in and @p available_in could be + * passed to the next consumer after decoding is complete. + * + * @param state decoder instance + * @param[in, out] available_in @b in: amount of available input; \n + * @b out: amount of unused input + * @param[in, out] next_in pointer to the next compressed byte + * @param[in, out] available_out @b in: length of output buffer; \n + * @b out: remaining size of output buffer + * @param[in, out] next_out output buffer cursor; + * can be @c NULL if @p available_out is @c 0 + * @param[out] total_out number of bytes decompressed so far; can be @c NULL + * @returns ::BROTLI_DECODER_RESULT_ERROR if input is corrupted, memory + * allocation failed, arguments were invalid, etc.; + * use ::BrotliDecoderGetErrorCode to get detailed error code + * @returns ::BROTLI_DECODER_RESULT_NEEDS_MORE_INPUT decoding is blocked until + * more input data is provided + * @returns ::BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT decoding is blocked until + * more output space is provided + * @returns ::BROTLI_DECODER_RESULT_SUCCESS decoding is finished, no more + * input might be consumed and no more output will be produced + */ +BROTLI_DEC_API BrotliDecoderResult BrotliDecoderDecompressStream( + BrotliDecoderState* state, size_t* available_in, const uint8_t** next_in, + size_t* available_out, uint8_t** next_out, size_t* total_out); + +/** + * Checks if decoder has more output. + * + * @param state decoder instance + * @returns ::BROTLI_TRUE, if decoder has some unconsumed output + * @returns ::BROTLI_FALSE otherwise + */ +BROTLI_DEC_API BROTLI_BOOL BrotliDecoderHasMoreOutput( + const BrotliDecoderState* state); + +/** + * Acquires pointer to internal output buffer. + * + * This method is used to make language bindings easier and more efficient: + * -# push data to ::BrotliDecoderDecompressStream, + * until ::BROTLI_DECODER_RESULT_NEEDS_MORE_OUTPUT is reported + * -# use ::BrotliDecoderTakeOutput to peek bytes and copy to language-specific + * entity + * + * Also this could be useful if there is an output stream that is able to + * consume all the provided data (e.g. when data is saved to file system). + * + * @attention After every call to ::BrotliDecoderTakeOutput @p *size bytes of + * output are considered consumed for all consecutive calls to the + * instance methods; returned pointer becomes invalidated as well. + * + * @note Decoder output is not guaranteed to be contiguous. This means that + * after the size-unrestricted call to ::BrotliDecoderTakeOutput, + * immediate next call to ::BrotliDecoderTakeOutput may return more data. + * + * @param state decoder instance + * @param[in, out] size @b in: number of bytes caller is ready to take, @c 0 if + * any amount could be handled; \n + * @b out: amount of data pointed by returned pointer and + * considered consumed; \n + * out value is never greater than in value, unless it is @c 0 + * @returns pointer to output data + */ +BROTLI_DEC_API const uint8_t* BrotliDecoderTakeOutput( + BrotliDecoderState* state, size_t* size); + +/** + * Checks if instance has already consumed input. + * + * Instance that returns ::BROTLI_FALSE is considered "fresh" and could be + * reused. + * + * @param state decoder instance + * @returns ::BROTLI_TRUE if decoder has already used some input bytes + * @returns ::BROTLI_FALSE otherwise + */ +BROTLI_DEC_API BROTLI_BOOL BrotliDecoderIsUsed(const BrotliDecoderState* state); + +/** + * Checks if decoder instance reached the final state. + * + * @param state decoder instance + * @returns ::BROTLI_TRUE if decoder is in a state where it reached the end of + * the input and produced all of the output + * @returns ::BROTLI_FALSE otherwise + */ +BROTLI_DEC_API BROTLI_BOOL BrotliDecoderIsFinished( + const BrotliDecoderState* state); + +/** + * Acquires a detailed error code. + * + * Should be used only after ::BrotliDecoderDecompressStream returns + * ::BROTLI_DECODER_RESULT_ERROR. + * + * See also ::BrotliDecoderErrorString + * + * @param state decoder instance + * @returns last saved error code + */ +BROTLI_DEC_API BrotliDecoderErrorCode BrotliDecoderGetErrorCode( + const BrotliDecoderState* state); + +/** + * Converts error code to a c-string. + */ +BROTLI_DEC_API const char* BrotliDecoderErrorString(BrotliDecoderErrorCode c); + +/** + * Gets a decoder library version. + * + * Look at BROTLI_MAKE_HEX_VERSION for more information. + */ +BROTLI_DEC_API uint32_t BrotliDecoderVersion(void); + +/** + * Callback to fire on metadata block start. + * + * After this callback is fired, if @p size is not @c 0, it is followed by + * ::brotli_decoder_metadata_chunk_func as more metadata block contents become + * accessible. + * + * @param opaque callback handle + * @param size size of metadata block + */ +typedef void (*brotli_decoder_metadata_start_func)(void* opaque, size_t size); + +/** + * Callback to fire on metadata block chunk becomes available. + * + * This function can be invoked multiple times per metadata block; block should + * be considered finished when sum of @p size matches the announced metadata + * block size. Chunks contents pointed by @p data are transient and shouln not + * be accessed after leaving the callback. + * + * @param opaque callback handle + * @param data pointer to metadata contents + * @param size size of metadata block chunk, at least @c 1 + */ +typedef void (*brotli_decoder_metadata_chunk_func)(void* opaque, + const uint8_t* data, + size_t size); + +/** + * Sets callback for receiving metadata blocks. + * + * @param state decoder instance + * @param start_func callback on metadata block start + * @param chunk_func callback on metadata block chunk + * @param opaque callback handle + */ +BROTLI_DEC_API void BrotliDecoderSetMetadataCallbacks( + BrotliDecoderState* state, + brotli_decoder_metadata_start_func start_func, + brotli_decoder_metadata_chunk_func chunk_func, void* opaque); + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_DEC_DECODE_H_ */ diff --git a/modules/brotli/include/brotli/encode.h b/modules/brotli/include/brotli/encode.h new file mode 100644 index 0000000000..dea9931ebb --- /dev/null +++ b/modules/brotli/include/brotli/encode.h @@ -0,0 +1,501 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/** + * @file + * API for Brotli compression. + */ + +#ifndef BROTLI_ENC_ENCODE_H_ +#define BROTLI_ENC_ENCODE_H_ + +#include <brotli/port.h> +#include <brotli/shared_dictionary.h> +#include <brotli/types.h> + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +/** Minimal value for ::BROTLI_PARAM_LGWIN parameter. */ +#define BROTLI_MIN_WINDOW_BITS 10 +/** + * Maximal value for ::BROTLI_PARAM_LGWIN parameter. + * + * @note equal to @c BROTLI_MAX_DISTANCE_BITS constant. + */ +#define BROTLI_MAX_WINDOW_BITS 24 +/** + * Maximal value for ::BROTLI_PARAM_LGWIN parameter + * in "Large Window Brotli" (32-bit). + */ +#define BROTLI_LARGE_MAX_WINDOW_BITS 30 +/** Minimal value for ::BROTLI_PARAM_LGBLOCK parameter. */ +#define BROTLI_MIN_INPUT_BLOCK_BITS 16 +/** Maximal value for ::BROTLI_PARAM_LGBLOCK parameter. */ +#define BROTLI_MAX_INPUT_BLOCK_BITS 24 +/** Minimal value for ::BROTLI_PARAM_QUALITY parameter. */ +#define BROTLI_MIN_QUALITY 0 +/** Maximal value for ::BROTLI_PARAM_QUALITY parameter. */ +#define BROTLI_MAX_QUALITY 11 + +/** Options for ::BROTLI_PARAM_MODE parameter. */ +typedef enum BrotliEncoderMode { + /** + * Default compression mode. + * + * In this mode compressor does not know anything in advance about the + * properties of the input. + */ + BROTLI_MODE_GENERIC = 0, + /** Compression mode for UTF-8 formatted text input. */ + BROTLI_MODE_TEXT = 1, + /** Compression mode used in WOFF 2.0. */ + BROTLI_MODE_FONT = 2 +} BrotliEncoderMode; + +/** Default value for ::BROTLI_PARAM_QUALITY parameter. */ +#define BROTLI_DEFAULT_QUALITY 11 +/** Default value for ::BROTLI_PARAM_LGWIN parameter. */ +#define BROTLI_DEFAULT_WINDOW 22 +/** Default value for ::BROTLI_PARAM_MODE parameter. */ +#define BROTLI_DEFAULT_MODE BROTLI_MODE_GENERIC + +/** Operations that can be performed by streaming encoder. */ +typedef enum BrotliEncoderOperation { + /** + * Process input. + * + * Encoder may postpone producing output, until it has processed enough input. + */ + BROTLI_OPERATION_PROCESS = 0, + /** + * Produce output for all processed input. + * + * Actual flush is performed when input stream is depleted and there is enough + * space in output stream. This means that client should repeat + * ::BROTLI_OPERATION_FLUSH operation until @p available_in becomes @c 0, and + * ::BrotliEncoderHasMoreOutput returns ::BROTLI_FALSE. If output is acquired + * via ::BrotliEncoderTakeOutput, then operation should be repeated after + * output buffer is drained. + * + * @warning Until flush is complete, client @b SHOULD @b NOT swap, + * reduce or extend input stream. + * + * When flush is complete, output data will be sufficient for decoder to + * reproduce all the given input. + */ + BROTLI_OPERATION_FLUSH = 1, + /** + * Finalize the stream. + * + * Actual finalization is performed when input stream is depleted and there is + * enough space in output stream. This means that client should repeat + * ::BROTLI_OPERATION_FINISH operation until @p available_in becomes @c 0, and + * ::BrotliEncoderHasMoreOutput returns ::BROTLI_FALSE. If output is acquired + * via ::BrotliEncoderTakeOutput, then operation should be repeated after + * output buffer is drained. + * + * @warning Until finalization is complete, client @b SHOULD @b NOT swap, + * reduce or extend input stream. + * + * Helper function ::BrotliEncoderIsFinished checks if stream is finalized and + * output fully dumped. + * + * Adding more input data to finalized stream is impossible. + */ + BROTLI_OPERATION_FINISH = 2, + /** + * Emit metadata block to stream. + * + * Metadata is opaque to Brotli: neither encoder, nor decoder processes this + * data or relies on it. It may be used to pass some extra information from + * encoder client to decoder client without interfering with main data stream. + * + * @note Encoder may emit empty metadata blocks internally, to pad encoded + * stream to byte boundary. + * + * @warning Until emitting metadata is complete client @b SHOULD @b NOT swap, + * reduce or extend input stream. + * + * @warning The whole content of input buffer is considered to be the content + * of metadata block. Do @b NOT @e append metadata to input stream, + * before it is depleted with other operations. + * + * Stream is soft-flushed before metadata block is emitted. Metadata block + * @b MUST be no longer than than 16MiB. + */ + BROTLI_OPERATION_EMIT_METADATA = 3 +} BrotliEncoderOperation; + +/** Options to be used with ::BrotliEncoderSetParameter. */ +typedef enum BrotliEncoderParameter { + /** + * Tune encoder for specific input. + * + * ::BrotliEncoderMode enumerates all available values. + */ + BROTLI_PARAM_MODE = 0, + /** + * The main compression speed-density lever. + * + * The higher the quality, the slower the compression. Range is + * from ::BROTLI_MIN_QUALITY to ::BROTLI_MAX_QUALITY. + */ + BROTLI_PARAM_QUALITY = 1, + /** + * Recommended sliding LZ77 window size. + * + * Encoder may reduce this value, e.g. if input is much smaller than + * window size. + * + * Window size is `(1 << value) - 16`. + * + * Range is from ::BROTLI_MIN_WINDOW_BITS to ::BROTLI_MAX_WINDOW_BITS. + */ + BROTLI_PARAM_LGWIN = 2, + /** + * Recommended input block size. + * + * Encoder may reduce this value, e.g. if input is much smaller than input + * block size. + * + * Range is from ::BROTLI_MIN_INPUT_BLOCK_BITS to + * ::BROTLI_MAX_INPUT_BLOCK_BITS. + * + * @note Bigger input block size allows better compression, but consumes more + * memory. \n The rough formula of memory used for temporary input + * storage is `3 << lgBlock`. + */ + BROTLI_PARAM_LGBLOCK = 3, + /** + * Flag that affects usage of "literal context modeling" format feature. + * + * This flag is a "decoding-speed vs compression ratio" trade-off. + */ + BROTLI_PARAM_DISABLE_LITERAL_CONTEXT_MODELING = 4, + /** + * Estimated total input size for all ::BrotliEncoderCompressStream calls. + * + * The default value is 0, which means that the total input size is unknown. + */ + BROTLI_PARAM_SIZE_HINT = 5, + /** + * Flag that determines if "Large Window Brotli" is used. + */ + BROTLI_PARAM_LARGE_WINDOW = 6, + /** + * Recommended number of postfix bits (NPOSTFIX). + * + * Encoder may change this value. + * + * Range is from 0 to ::BROTLI_MAX_NPOSTFIX. + */ + BROTLI_PARAM_NPOSTFIX = 7, + /** + * Recommended number of direct distance codes (NDIRECT). + * + * Encoder may change this value. + * + * Range is from 0 to (15 << NPOSTFIX) in steps of (1 << NPOSTFIX). + */ + BROTLI_PARAM_NDIRECT = 8, + /** + * Number of bytes of input stream already processed by a different instance. + * + * @note It is important to configure all the encoder instances with same + * parameters (except this one) in order to allow all the encoded parts + * obey the same restrictions implied by header. + * + * If offset is not 0, then stream header is omitted. + * In any case output start is byte aligned, so for proper streams stitching + * "predecessor" stream must be flushed. + * + * Range is not artificially limited, but all the values greater or equal to + * maximal window size have the same effect. Values greater than 2**30 are not + * allowed. + */ + BROTLI_PARAM_STREAM_OFFSET = 9 +} BrotliEncoderParameter; + +/** + * Opaque structure that holds encoder state. + * + * Allocated and initialized with ::BrotliEncoderCreateInstance. + * Cleaned up and deallocated with ::BrotliEncoderDestroyInstance. + */ +typedef struct BrotliEncoderStateStruct BrotliEncoderState; + +/** + * Sets the specified parameter to the given encoder instance. + * + * @param state encoder instance + * @param param parameter to set + * @param value new parameter value + * @returns ::BROTLI_FALSE if parameter is unrecognized, or value is invalid + * @returns ::BROTLI_FALSE if value of parameter can not be changed at current + * encoder state (e.g. when encoding is started, window size might be + * already encoded and therefore it is impossible to change it) + * @returns ::BROTLI_TRUE if value is accepted + * @warning invalid values might be accepted in case they would not break + * encoding process. + */ +BROTLI_ENC_API BROTLI_BOOL BrotliEncoderSetParameter( + BrotliEncoderState* state, BrotliEncoderParameter param, uint32_t value); + +/** + * Creates an instance of ::BrotliEncoderState and initializes it. + * + * @p alloc_func and @p free_func @b MUST be both zero or both non-zero. In the + * case they are both zero, default memory allocators are used. @p opaque is + * passed to @p alloc_func and @p free_func when they are called. @p free_func + * has to return without doing anything when asked to free a NULL pointer. + * + * @param alloc_func custom memory allocation function + * @param free_func custom memory free function + * @param opaque custom memory manager handle + * @returns @c 0 if instance can not be allocated or initialized + * @returns pointer to initialized ::BrotliEncoderState otherwise + */ +BROTLI_ENC_API BrotliEncoderState* BrotliEncoderCreateInstance( + brotli_alloc_func alloc_func, brotli_free_func free_func, void* opaque); + +/** + * Deinitializes and frees ::BrotliEncoderState instance. + * + * @param state decoder instance to be cleaned up and deallocated + */ +BROTLI_ENC_API void BrotliEncoderDestroyInstance(BrotliEncoderState* state); + +/* Opaque type for pointer to different possible internal structures containing + dictionary prepared for the encoder */ +typedef struct BrotliEncoderPreparedDictionaryStruct + BrotliEncoderPreparedDictionary; + +/** + * Prepares a shared dictionary from the given file format for the encoder. + * + * @p alloc_func and @p free_func @b MUST be both zero or both non-zero. In the + * case they are both zero, default memory allocators are used. @p opaque is + * passed to @p alloc_func and @p free_func when they are called. @p free_func + * has to return without doing anything when asked to free a NULL pointer. + * + * @param type type of dictionary stored in data + * @param data_size size of @p data buffer + * @param data pointer to the dictionary data + * @param quality the maximum Brotli quality to prepare the dictionary for, + * use BROTLI_MAX_QUALITY by default + * @param alloc_func custom memory allocation function + * @param free_func custom memory free function + * @param opaque custom memory manager handle + */ +BROTLI_ENC_API BrotliEncoderPreparedDictionary* +BrotliEncoderPrepareDictionary(BrotliSharedDictionaryType type, + size_t data_size, const uint8_t data[BROTLI_ARRAY_PARAM(data_size)], + int quality, + brotli_alloc_func alloc_func, brotli_free_func free_func, void* opaque); + +BROTLI_ENC_API void BrotliEncoderDestroyPreparedDictionary( + BrotliEncoderPreparedDictionary* dictionary); + +/** + * Attaches a prepared dictionary of any type to the encoder. Can be used + * multiple times to attach multiple dictionaries. The dictionary type was + * determined by BrotliEncoderPrepareDictionary. Multiple raw prefix + * dictionaries and/or max 1 serialized dictionary with custom words can be + * attached. + * + * @returns ::BROTLI_FALSE in case of error + * @returns ::BROTLI_TRUE otherwise + */ +BROTLI_ENC_API BROTLI_BOOL BrotliEncoderAttachPreparedDictionary( + BrotliEncoderState* state, + const BrotliEncoderPreparedDictionary* dictionary); + +/** + * Calculates the output size bound for the given @p input_size. + * + * @warning Result is only valid if quality is at least @c 2 and, in + * case ::BrotliEncoderCompressStream was used, no flushes + * (::BROTLI_OPERATION_FLUSH) were performed. + * + * @param input_size size of projected input + * @returns @c 0 if result does not fit @c size_t + */ +BROTLI_ENC_API size_t BrotliEncoderMaxCompressedSize(size_t input_size); + +/** + * Performs one-shot memory-to-memory compression. + * + * Compresses the data in @p input_buffer into @p encoded_buffer, and sets + * @p *encoded_size to the compressed length. + * + * @note If ::BrotliEncoderMaxCompressedSize(@p input_size) returns non-zero + * value, then output is guaranteed to be no longer than that. + * + * @note If @p lgwin is greater than ::BROTLI_MAX_WINDOW_BITS then resulting + * stream might be incompatible with RFC 7932; to decode such streams, + * decoder should be configured with + * ::BROTLI_DECODER_PARAM_LARGE_WINDOW = @c 1 + * + * @param quality quality parameter value, e.g. ::BROTLI_DEFAULT_QUALITY + * @param lgwin lgwin parameter value, e.g. ::BROTLI_DEFAULT_WINDOW + * @param mode mode parameter value, e.g. ::BROTLI_DEFAULT_MODE + * @param input_size size of @p input_buffer + * @param input_buffer input data buffer with at least @p input_size + * addressable bytes + * @param[in, out] encoded_size @b in: size of @p encoded_buffer; \n + * @b out: length of compressed data written to + * @p encoded_buffer, or @c 0 if compression fails + * @param encoded_buffer compressed data destination buffer + * @returns ::BROTLI_FALSE in case of compression error + * @returns ::BROTLI_FALSE if output buffer is too small + * @returns ::BROTLI_TRUE otherwise + */ +BROTLI_ENC_API BROTLI_BOOL BrotliEncoderCompress( + int quality, int lgwin, BrotliEncoderMode mode, size_t input_size, + const uint8_t input_buffer[BROTLI_ARRAY_PARAM(input_size)], + size_t* encoded_size, + uint8_t encoded_buffer[BROTLI_ARRAY_PARAM(*encoded_size)]); + +/** + * Compresses input stream to output stream. + * + * The values @p *available_in and @p *available_out must specify the number of + * bytes addressable at @p *next_in and @p *next_out respectively. + * When @p *available_out is @c 0, @p next_out is allowed to be @c NULL. + * + * After each call, @p *available_in will be decremented by the amount of input + * bytes consumed, and the @p *next_in pointer will be incremented by that + * amount. Similarly, @p *available_out will be decremented by the amount of + * output bytes written, and the @p *next_out pointer will be incremented by + * that amount. + * + * @p total_out, if it is not a null-pointer, will be set to the number + * of bytes compressed since the last @p state initialization. + * + * + * + * Internally workflow consists of 3 tasks: + * -# (optionally) copy input data to internal buffer + * -# actually compress data and (optionally) store it to internal buffer + * -# (optionally) copy compressed bytes from internal buffer to output stream + * + * Whenever all 3 tasks can't move forward anymore, or error occurs, this + * method returns the control flow to caller. + * + * @p op is used to perform flush, finish the stream, or inject metadata block. + * See ::BrotliEncoderOperation for more information. + * + * Flushing the stream means forcing encoding of all input passed to encoder and + * completing the current output block, so it could be fully decoded by stream + * decoder. To perform flush set @p op to ::BROTLI_OPERATION_FLUSH. + * Under some circumstances (e.g. lack of output stream capacity) this operation + * would require several calls to ::BrotliEncoderCompressStream. The method must + * be called again until both input stream is depleted and encoder has no more + * output (see ::BrotliEncoderHasMoreOutput) after the method is called. + * + * Finishing the stream means encoding of all input passed to encoder and + * adding specific "final" marks, so stream decoder could determine that stream + * is complete. To perform finish set @p op to ::BROTLI_OPERATION_FINISH. + * Under some circumstances (e.g. lack of output stream capacity) this operation + * would require several calls to ::BrotliEncoderCompressStream. The method must + * be called again until both input stream is depleted and encoder has no more + * output (see ::BrotliEncoderHasMoreOutput) after the method is called. + * + * @warning When flushing and finishing, @p op should not change until operation + * is complete; input stream should not be swapped, reduced or + * extended as well. + * + * @param state encoder instance + * @param op requested operation + * @param[in, out] available_in @b in: amount of available input; \n + * @b out: amount of unused input + * @param[in, out] next_in pointer to the next input byte + * @param[in, out] available_out @b in: length of output buffer; \n + * @b out: remaining size of output buffer + * @param[in, out] next_out compressed output buffer cursor; + * can be @c NULL if @p available_out is @c 0 + * @param[out] total_out number of bytes produced so far; can be @c NULL + * @returns ::BROTLI_FALSE if there was an error + * @returns ::BROTLI_TRUE otherwise + */ +BROTLI_ENC_API BROTLI_BOOL BrotliEncoderCompressStream( + BrotliEncoderState* state, BrotliEncoderOperation op, size_t* available_in, + const uint8_t** next_in, size_t* available_out, uint8_t** next_out, + size_t* total_out); + +/** + * Checks if encoder instance reached the final state. + * + * @param state encoder instance + * @returns ::BROTLI_TRUE if encoder is in a state where it reached the end of + * the input and produced all of the output + * @returns ::BROTLI_FALSE otherwise + */ +BROTLI_ENC_API BROTLI_BOOL BrotliEncoderIsFinished(BrotliEncoderState* state); + +/** + * Checks if encoder has more output. + * + * @param state encoder instance + * @returns ::BROTLI_TRUE, if encoder has some unconsumed output + * @returns ::BROTLI_FALSE otherwise + */ +BROTLI_ENC_API BROTLI_BOOL BrotliEncoderHasMoreOutput( + BrotliEncoderState* state); + +/** + * Acquires pointer to internal output buffer. + * + * This method is used to make language bindings easier and more efficient: + * -# push data to ::BrotliEncoderCompressStream, + * until ::BrotliEncoderHasMoreOutput returns BROTLI_TRUE + * -# use ::BrotliEncoderTakeOutput to peek bytes and copy to language-specific + * entity + * + * Also this could be useful if there is an output stream that is able to + * consume all the provided data (e.g. when data is saved to file system). + * + * @attention After every call to ::BrotliEncoderTakeOutput @p *size bytes of + * output are considered consumed for all consecutive calls to the + * instance methods; returned pointer becomes invalidated as well. + * + * @note Encoder output is not guaranteed to be contiguous. This means that + * after the size-unrestricted call to ::BrotliEncoderTakeOutput, + * immediate next call to ::BrotliEncoderTakeOutput may return more data. + * + * @param state encoder instance + * @param[in, out] size @b in: number of bytes caller is ready to take, @c 0 if + * any amount could be handled; \n + * @b out: amount of data pointed by returned pointer and + * considered consumed; \n + * out value is never greater than in value, unless it is @c 0 + * @returns pointer to output data + */ +BROTLI_ENC_API const uint8_t* BrotliEncoderTakeOutput( + BrotliEncoderState* state, size_t* size); + +/* Returns the estimated peak memory usage (in bytes) of the BrotliCompress() + function, not counting the memory needed for the input and output. */ +BROTLI_ENC_EXTRA_API size_t BrotliEncoderEstimatePeakMemoryUsage( + int quality, int lgwin, size_t input_size); +/* Returns 0 if dictionary is not valid; otherwise returns allocation size. */ +BROTLI_ENC_EXTRA_API size_t BrotliEncoderGetPreparedDictionarySize( + const BrotliEncoderPreparedDictionary* dictionary); + +/** + * Gets an encoder library version. + * + * Look at BROTLI_MAKE_HEX_VERSION for more information. + */ +BROTLI_ENC_API uint32_t BrotliEncoderVersion(void); + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_ENC_ENCODE_H_ */ diff --git a/modules/brotli/include/brotli/port.h b/modules/brotli/include/brotli/port.h new file mode 100644 index 0000000000..0d50019042 --- /dev/null +++ b/modules/brotli/include/brotli/port.h @@ -0,0 +1,305 @@ +/* Copyright 2016 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* Macros for compiler / platform specific API declarations. */ + +#ifndef BROTLI_COMMON_PORT_H_ +#define BROTLI_COMMON_PORT_H_ + +/* The following macros were borrowed from https://github.com/nemequ/hedley + * with permission of original author - Evan Nemerson <evan@nemerson.com> */ + +/* >>> >>> >>> hedley macros */ + +#define BROTLI_MAKE_VERSION(major, minor, revision) \ + (((major) * 1000000) + ((minor) * 1000) + (revision)) + +#if defined(__GNUC__) && defined(__GNUC_PATCHLEVEL__) +#define BROTLI_GNUC_VERSION \ + BROTLI_MAKE_VERSION(__GNUC__, __GNUC_MINOR__, __GNUC_PATCHLEVEL__) +#elif defined(__GNUC__) +#define BROTLI_GNUC_VERSION BROTLI_MAKE_VERSION(__GNUC__, __GNUC_MINOR__, 0) +#endif + +#if defined(BROTLI_GNUC_VERSION) +#define BROTLI_GNUC_VERSION_CHECK(major, minor, patch) \ + (BROTLI_GNUC_VERSION >= BROTLI_MAKE_VERSION(major, minor, patch)) +#else +#define BROTLI_GNUC_VERSION_CHECK(major, minor, patch) (0) +#endif + +#if defined(_MSC_FULL_VER) && (_MSC_FULL_VER >= 140000000) +#define BROTLI_MSVC_VERSION \ + BROTLI_MAKE_VERSION((_MSC_FULL_VER / 10000000), \ + (_MSC_FULL_VER % 10000000) / 100000, \ + (_MSC_FULL_VER % 100000) / 100) +#elif defined(_MSC_FULL_VER) +#define BROTLI_MSVC_VERSION \ + BROTLI_MAKE_VERSION((_MSC_FULL_VER / 1000000), \ + (_MSC_FULL_VER % 1000000) / 10000, \ + (_MSC_FULL_VER % 10000) / 10) +#elif defined(_MSC_VER) +#define BROTLI_MSVC_VERSION \ + BROTLI_MAKE_VERSION(_MSC_VER / 100, _MSC_VER % 100, 0) +#endif + +#if !defined(_MSC_VER) +#define BROTLI_MSVC_VERSION_CHECK(major, minor, patch) (0) +#elif defined(_MSC_VER) && (_MSC_VER >= 1400) +#define BROTLI_MSVC_VERSION_CHECK(major, minor, patch) \ + (_MSC_FULL_VER >= ((major * 10000000) + (minor * 100000) + (patch))) +#elif defined(_MSC_VER) && (_MSC_VER >= 1200) +#define BROTLI_MSVC_VERSION_CHECK(major, minor, patch) \ + (_MSC_FULL_VER >= ((major * 1000000) + (minor * 10000) + (patch))) +#else +#define BROTLI_MSVC_VERSION_CHECK(major, minor, patch) \ + (_MSC_VER >= ((major * 100) + (minor))) +#endif + +#if defined(__INTEL_COMPILER) && defined(__INTEL_COMPILER_UPDATE) +#define BROTLI_INTEL_VERSION \ + BROTLI_MAKE_VERSION(__INTEL_COMPILER / 100, \ + __INTEL_COMPILER % 100, \ + __INTEL_COMPILER_UPDATE) +#elif defined(__INTEL_COMPILER) +#define BROTLI_INTEL_VERSION \ + BROTLI_MAKE_VERSION(__INTEL_COMPILER / 100, __INTEL_COMPILER % 100, 0) +#endif + +#if defined(BROTLI_INTEL_VERSION) +#define BROTLI_INTEL_VERSION_CHECK(major, minor, patch) \ + (BROTLI_INTEL_VERSION >= BROTLI_MAKE_VERSION(major, minor, patch)) +#else +#define BROTLI_INTEL_VERSION_CHECK(major, minor, patch) (0) +#endif + +#if defined(__PGI) && \ + defined(__PGIC__) && defined(__PGIC_MINOR__) && defined(__PGIC_PATCHLEVEL__) +#define BROTLI_PGI_VERSION \ + BROTLI_MAKE_VERSION(__PGIC__, __PGIC_MINOR__, __PGIC_PATCHLEVEL__) +#endif + +#if defined(BROTLI_PGI_VERSION) +#define BROTLI_PGI_VERSION_CHECK(major, minor, patch) \ + (BROTLI_PGI_VERSION >= BROTLI_MAKE_VERSION(major, minor, patch)) +#else +#define BROTLI_PGI_VERSION_CHECK(major, minor, patch) (0) +#endif + +#if defined(__SUNPRO_C) && (__SUNPRO_C > 0x1000) +#define BROTLI_SUNPRO_VERSION \ + BROTLI_MAKE_VERSION( \ + (((__SUNPRO_C >> 16) & 0xf) * 10) + ((__SUNPRO_C >> 12) & 0xf), \ + (((__SUNPRO_C >> 8) & 0xf) * 10) + ((__SUNPRO_C >> 4) & 0xf), \ + (__SUNPRO_C & 0xf) * 10) +#elif defined(__SUNPRO_C) +#define BROTLI_SUNPRO_VERSION \ + BROTLI_MAKE_VERSION((__SUNPRO_C >> 8) & 0xf, \ + (__SUNPRO_C >> 4) & 0xf, \ + (__SUNPRO_C) & 0xf) +#elif defined(__SUNPRO_CC) && (__SUNPRO_CC > 0x1000) +#define BROTLI_SUNPRO_VERSION \ + BROTLI_MAKE_VERSION( \ + (((__SUNPRO_CC >> 16) & 0xf) * 10) + ((__SUNPRO_CC >> 12) & 0xf), \ + (((__SUNPRO_CC >> 8) & 0xf) * 10) + ((__SUNPRO_CC >> 4) & 0xf), \ + (__SUNPRO_CC & 0xf) * 10) +#elif defined(__SUNPRO_CC) +#define BROTLI_SUNPRO_VERSION \ + BROTLI_MAKE_VERSION((__SUNPRO_CC >> 8) & 0xf, \ + (__SUNPRO_CC >> 4) & 0xf, \ + (__SUNPRO_CC) & 0xf) +#endif + +#if defined(BROTLI_SUNPRO_VERSION) +#define BROTLI_SUNPRO_VERSION_CHECK(major, minor, patch) \ + (BROTLI_SUNPRO_VERSION >= BROTLI_MAKE_VERSION(major, minor, patch)) +#else +#define BROTLI_SUNPRO_VERSION_CHECK(major, minor, patch) (0) +#endif + +#if defined(__CC_ARM) && defined(__ARMCOMPILER_VERSION) +#define BROTLI_ARM_VERSION \ + BROTLI_MAKE_VERSION((__ARMCOMPILER_VERSION / 1000000), \ + (__ARMCOMPILER_VERSION % 1000000) / 10000, \ + (__ARMCOMPILER_VERSION % 10000) / 100) +#elif defined(__CC_ARM) && defined(__ARMCC_VERSION) +#define BROTLI_ARM_VERSION \ + BROTLI_MAKE_VERSION((__ARMCC_VERSION / 1000000), \ + (__ARMCC_VERSION % 1000000) / 10000, \ + (__ARMCC_VERSION % 10000) / 100) +#endif + +#if defined(BROTLI_ARM_VERSION) +#define BROTLI_ARM_VERSION_CHECK(major, minor, patch) \ + (BROTLI_ARM_VERSION >= BROTLI_MAKE_VERSION(major, minor, patch)) +#else +#define BROTLI_ARM_VERSION_CHECK(major, minor, patch) (0) +#endif + +#if defined(__ibmxl__) +#define BROTLI_IBM_VERSION \ + BROTLI_MAKE_VERSION(__ibmxl_version__, \ + __ibmxl_release__, \ + __ibmxl_modification__) +#elif defined(__xlC__) && defined(__xlC_ver__) +#define BROTLI_IBM_VERSION \ + BROTLI_MAKE_VERSION(__xlC__ >> 8, __xlC__ & 0xff, (__xlC_ver__ >> 8) & 0xff) +#elif defined(__xlC__) +#define BROTLI_IBM_VERSION BROTLI_MAKE_VERSION(__xlC__ >> 8, __xlC__ & 0xff, 0) +#endif + +#if defined(BROTLI_IBM_VERSION) +#define BROTLI_IBM_VERSION_CHECK(major, minor, patch) \ + (BROTLI_IBM_VERSION >= BROTLI_MAKE_VERSION(major, minor, patch)) +#else +#define BROTLI_IBM_VERSION_CHECK(major, minor, patch) (0) +#endif + +#if defined(__TI_COMPILER_VERSION__) +#define BROTLI_TI_VERSION \ + BROTLI_MAKE_VERSION((__TI_COMPILER_VERSION__ / 1000000), \ + (__TI_COMPILER_VERSION__ % 1000000) / 1000, \ + (__TI_COMPILER_VERSION__ % 1000)) +#endif + +#if defined(BROTLI_TI_VERSION) +#define BROTLI_TI_VERSION_CHECK(major, minor, patch) \ + (BROTLI_TI_VERSION >= BROTLI_MAKE_VERSION(major, minor, patch)) +#else +#define BROTLI_TI_VERSION_CHECK(major, minor, patch) (0) +#endif + +#if defined(__IAR_SYSTEMS_ICC__) +#if __VER__ > 1000 +#define BROTLI_IAR_VERSION \ + BROTLI_MAKE_VERSION((__VER__ / 1000000), \ + (__VER__ / 1000) % 1000, \ + (__VER__ % 1000)) +#else +#define BROTLI_IAR_VERSION BROTLI_MAKE_VERSION(VER / 100, __VER__ % 100, 0) +#endif +#endif + +#if defined(BROTLI_IAR_VERSION) +#define BROTLI_IAR_VERSION_CHECK(major, minor, patch) \ + (BROTLI_IAR_VERSION >= BROTLI_MAKE_VERSION(major, minor, patch)) +#else +#define BROTLI_IAR_VERSION_CHECK(major, minor, patch) (0) +#endif + +#if defined(__TINYC__) +#define BROTLI_TINYC_VERSION \ + BROTLI_MAKE_VERSION(__TINYC__ / 1000, (__TINYC__ / 100) % 10, __TINYC__ % 100) +#endif + +#if defined(BROTLI_TINYC_VERSION) +#define BROTLI_TINYC_VERSION_CHECK(major, minor, patch) \ + (BROTLI_TINYC_VERSION >= BROTLI_MAKE_VERSION(major, minor, patch)) +#else +#define BROTLI_TINYC_VERSION_CHECK(major, minor, patch) (0) +#endif + +#if defined(__has_attribute) +#define BROTLI_GNUC_HAS_ATTRIBUTE(attribute, major, minor, patch) \ + __has_attribute(attribute) +#else +#define BROTLI_GNUC_HAS_ATTRIBUTE(attribute, major, minor, patch) \ + BROTLI_GNUC_VERSION_CHECK(major, minor, patch) +#endif + +#if defined(__has_builtin) +#define BROTLI_GNUC_HAS_BUILTIN(builtin, major, minor, patch) \ + __has_builtin(builtin) +#else +#define BROTLI_GNUC_HAS_BUILTIN(builtin, major, minor, patch) \ + BROTLI_GNUC_VERSION_CHECK(major, minor, patch) +#endif + +#if defined(__has_feature) +#define BROTLI_HAS_FEATURE(feature) __has_feature(feature) +#else +#define BROTLI_HAS_FEATURE(feature) (0) +#endif + +#if defined(_WIN32) || defined(__CYGWIN__) +#define BROTLI_PUBLIC +#elif BROTLI_GNUC_VERSION_CHECK(3, 3, 0) || \ + BROTLI_TI_VERSION_CHECK(8, 0, 0) || \ + BROTLI_INTEL_VERSION_CHECK(16, 0, 0) || \ + BROTLI_ARM_VERSION_CHECK(4, 1, 0) || \ + BROTLI_IBM_VERSION_CHECK(13, 1, 0) || \ + BROTLI_SUNPRO_VERSION_CHECK(5, 11, 0) || \ + (BROTLI_TI_VERSION_CHECK(7, 3, 0) && \ + defined(__TI_GNU_ATTRIBUTE_SUPPORT__) && defined(__TI_EABI__)) +#define BROTLI_PUBLIC __attribute__ ((visibility ("default"))) +#else +#define BROTLI_PUBLIC +#endif + +/* BROTLI_INTERNAL could be defined to override visibility, e.g. for tests. */ +#if !defined(BROTLI_INTERNAL) +#if defined(_WIN32) || defined(__CYGWIN__) +#define BROTLI_INTERNAL +#elif BROTLI_GNUC_VERSION_CHECK(3, 3, 0) || \ + BROTLI_TI_VERSION_CHECK(8, 0, 0) || \ + BROTLI_INTEL_VERSION_CHECK(16, 0, 0) || \ + BROTLI_ARM_VERSION_CHECK(4, 1, 0) || \ + BROTLI_IBM_VERSION_CHECK(13, 1, 0) || \ + BROTLI_SUNPRO_VERSION_CHECK(5, 11, 0) || \ + (BROTLI_TI_VERSION_CHECK(7, 3, 0) && \ + defined(__TI_GNU_ATTRIBUTE_SUPPORT__) && defined(__TI_EABI__)) +#define BROTLI_INTERNAL __attribute__ ((visibility ("hidden"))) +#else +#define BROTLI_INTERNAL +#endif +#endif + +#if defined(__STDC_VERSION__) && (__STDC_VERSION__ >= 199901L) && \ + !defined(__STDC_NO_VLA__) && !defined(__cplusplus) && \ + !defined(__PGI) && !defined(__PGIC__) && !defined(__TINYC__) && \ + !defined(__clang__) +#define BROTLI_ARRAY_PARAM(name) (name) +#else +#define BROTLI_ARRAY_PARAM(name) +#endif + +/* <<< <<< <<< end of hedley macros. */ + +#if defined(BROTLI_SHARED_COMPILATION) +#if defined(_WIN32) +#if defined(BROTLICOMMON_SHARED_COMPILATION) +#define BROTLI_COMMON_API __declspec(dllexport) +#else +#define BROTLI_COMMON_API __declspec(dllimport) +#endif /* BROTLICOMMON_SHARED_COMPILATION */ +#if defined(BROTLIDEC_SHARED_COMPILATION) +#define BROTLI_DEC_API __declspec(dllexport) +#else +#define BROTLI_DEC_API __declspec(dllimport) +#endif /* BROTLIDEC_SHARED_COMPILATION */ +#if defined(BROTLIENC_SHARED_COMPILATION) +#define BROTLI_ENC_API __declspec(dllexport) +#else +#define BROTLI_ENC_API __declspec(dllimport) +#endif /* BROTLIENC_SHARED_COMPILATION */ +#else /* _WIN32 */ +#define BROTLI_COMMON_API BROTLI_PUBLIC +#define BROTLI_DEC_API BROTLI_PUBLIC +#define BROTLI_ENC_API BROTLI_PUBLIC +#endif /* _WIN32 */ +#else /* BROTLI_SHARED_COMPILATION */ +#define BROTLI_COMMON_API +#define BROTLI_DEC_API +#define BROTLI_ENC_API +#endif + +#if defined(BROTLI_BUILD_ENC_EXTRA_API) +#define BROTLI_ENC_EXTRA_API BROTLI_ENC_API +#else +#define BROTLI_ENC_EXTRA_API BROTLI_INTERNAL +#endif + +#endif /* BROTLI_COMMON_PORT_H_ */ diff --git a/modules/brotli/include/brotli/shared_dictionary.h b/modules/brotli/include/brotli/shared_dictionary.h new file mode 100644 index 0000000000..2970c2dcc9 --- /dev/null +++ b/modules/brotli/include/brotli/shared_dictionary.h @@ -0,0 +1,100 @@ +/* Copyright 2017 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/* (Opaque) Shared Dictionary definition and utilities. */ + +#ifndef BROTLI_COMMON_SHARED_DICTIONARY_H_ +#define BROTLI_COMMON_SHARED_DICTIONARY_H_ + +#include <brotli/port.h> +#include <brotli/types.h> + +#if defined(__cplusplus) || defined(c_plusplus) +extern "C" { +#endif + +#define SHARED_BROTLI_MIN_DICTIONARY_WORD_LENGTH 4 +#define SHARED_BROTLI_MAX_DICTIONARY_WORD_LENGTH 31 +#define SHARED_BROTLI_NUM_DICTIONARY_CONTEXTS 64 +#define SHARED_BROTLI_MAX_COMPOUND_DICTS 15 + +/** + * Opaque structure that holds shared dictionary data. + * + * Allocated and initialized with ::BrotliSharedDictionaryCreateInstance. + * Cleaned up and deallocated with ::BrotliSharedDictionaryDestroyInstance. + */ +typedef struct BrotliSharedDictionaryStruct BrotliSharedDictionary; + +/** + * Input data type for ::BrotliSharedDictionaryAttach. + */ +typedef enum BrotliSharedDictionaryType { + /** Raw LZ77 prefix dictionary. */ + BROTLI_SHARED_DICTIONARY_RAW = 0, + /** Serialized shared dictionary. + * + * DO NOT USE: methods accepting this value will fail. + */ + BROTLI_SHARED_DICTIONARY_SERIALIZED = 1 +} BrotliSharedDictionaryType; + +/** + * Creates an instance of ::BrotliSharedDictionary. + * + * Fresh instance has default word dictionary and transforms + * and no LZ77 prefix dictionary. + * + * @p alloc_func and @p free_func @b MUST be both zero or both non-zero. In the + * case they are both zero, default memory allocators are used. @p opaque is + * passed to @p alloc_func and @p free_func when they are called. @p free_func + * has to return without doing anything when asked to free a NULL pointer. + * + * @param alloc_func custom memory allocation function + * @param free_func custom memory free function + * @param opaque custom memory manager handle + * @returns @c 0 if instance can not be allocated or initialized + * @returns pointer to initialized ::BrotliSharedDictionary otherwise + */ +BROTLI_COMMON_API BrotliSharedDictionary* BrotliSharedDictionaryCreateInstance( + brotli_alloc_func alloc_func, brotli_free_func free_func, void* opaque); + +/** + * Deinitializes and frees ::BrotliSharedDictionary instance. + * + * @param dict shared dictionary instance to be cleaned up and deallocated + */ +BROTLI_COMMON_API void BrotliSharedDictionaryDestroyInstance( + BrotliSharedDictionary* dict); + +/** + * Attaches dictionary to a given instance of ::BrotliSharedDictionary. + * + * Dictionary to be attached is represented in a serialized format as a region + * of memory. + * + * Provided data it partially referenced by a resulting (compound) dictionary, + * and should be kept untouched, while at least one compound dictionary uses it. + * This way memory overhead is kept minimal by the cost of additional resource + * management. + * + * @param dict dictionary to extend + * @param type type of dictionary to attach + * @param data_size size of @p data + * @param data serialized dictionary of type @p type, with at least @p data_size + * addressable bytes + * @returns ::BROTLI_TRUE if provided dictionary is successfully attached + * @returns ::BROTLI_FALSE otherwise + */ +BROTLI_COMMON_API BROTLI_BOOL BrotliSharedDictionaryAttach( + BrotliSharedDictionary* dict, BrotliSharedDictionaryType type, + size_t data_size, const uint8_t data[BROTLI_ARRAY_PARAM(data_size)]); + +#if defined(__cplusplus) || defined(c_plusplus) +} /* extern "C" */ +#endif + +#endif /* BROTLI_COMMON_SHARED_DICTIONARY_H_ */ diff --git a/modules/brotli/include/brotli/types.h b/modules/brotli/include/brotli/types.h new file mode 100644 index 0000000000..eff1a3cd07 --- /dev/null +++ b/modules/brotli/include/brotli/types.h @@ -0,0 +1,83 @@ +/* Copyright 2013 Google Inc. All Rights Reserved. + + Distributed under MIT license. + See file LICENSE for detail or copy at https://opensource.org/licenses/MIT +*/ + +/** + * @file + * Common types used in decoder and encoder API. + */ + +#ifndef BROTLI_COMMON_TYPES_H_ +#define BROTLI_COMMON_TYPES_H_ + +#include <stddef.h> /* for size_t */ + +#if defined(_MSC_VER) && (_MSC_VER < 1600) +typedef __int8 int8_t; +typedef unsigned __int8 uint8_t; +typedef __int16 int16_t; +typedef unsigned __int16 uint16_t; +typedef __int32 int32_t; +typedef unsigned __int32 uint32_t; +typedef unsigned __int64 uint64_t; +typedef __int64 int64_t; +#else +#include <stdint.h> +#endif /* defined(_MSC_VER) && (_MSC_VER < 1600) */ + +/** + * A portable @c bool replacement. + * + * ::BROTLI_BOOL is a "documentation" type: actually it is @c int, but in API it + * denotes a type, whose only values are ::BROTLI_TRUE and ::BROTLI_FALSE. + * + * ::BROTLI_BOOL values passed to Brotli should either be ::BROTLI_TRUE or + * ::BROTLI_FALSE, or be a result of ::TO_BROTLI_BOOL macros. + * + * ::BROTLI_BOOL values returned by Brotli should not be tested for equality + * with @c true, @c false, ::BROTLI_TRUE, ::BROTLI_FALSE, but rather should be + * evaluated, for example: @code{.cpp} + * if (SomeBrotliFunction(encoder, BROTLI_TRUE) && + * !OtherBrotliFunction(decoder, BROTLI_FALSE)) { + * bool x = !!YetAnotherBrotliFunction(encoder, TO_BROLTI_BOOL(2 * 2 == 4)); + * DoSomething(x); + * } + * @endcode + */ +#define BROTLI_BOOL int +/** Portable @c true replacement. */ +#define BROTLI_TRUE 1 +/** Portable @c false replacement. */ +#define BROTLI_FALSE 0 +/** @c bool to ::BROTLI_BOOL conversion macros. */ +#define TO_BROTLI_BOOL(X) (!!(X) ? BROTLI_TRUE : BROTLI_FALSE) + +#define BROTLI_MAKE_UINT64_T(high, low) ((((uint64_t)(high)) << 32) | low) + +#define BROTLI_UINT32_MAX (~((uint32_t)0)) +#define BROTLI_SIZE_MAX (~((size_t)0)) + +/** + * Allocating function pointer type. + * + * @param opaque custom memory manager handle provided by client + * @param size requested memory region size; can not be @c 0 + * @returns @c 0 in the case of failure + * @returns a valid pointer to a memory region of at least @p size bytes + * long otherwise + */ +typedef void* (*brotli_alloc_func)(void* opaque, size_t size); + +/** + * Deallocating function pointer type. + * + * This function @b SHOULD do nothing if @p address is @c 0. + * + * @param opaque custom memory manager handle provided by client + * @param address memory region pointer returned by ::brotli_alloc_func, or @c 0 + */ +typedef void (*brotli_free_func)(void* opaque, void* address); + +#endif /* BROTLI_COMMON_TYPES_H_ */ diff --git a/modules/brotli/moz.build b/modules/brotli/moz.build new file mode 100644 index 0000000000..60db05ec90 --- /dev/null +++ b/modules/brotli/moz.build @@ -0,0 +1,36 @@ +# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*- +# vim: set filetype=python: +# This Source Code Form is subject to the terms of the Mozilla Public +# License, v. 2.0. If a copy of the MPL was not distributed with this +# file, You can obtain one at http://mozilla.org/MPL/2.0/. + +with Files('**'): + BUG_COMPONENT = ('Core', 'General') + +EXPORTS.brotli += [ + 'include/brotli/decode.h', + 'include/brotli/encode.h', + 'include/brotli/port.h', + 'include/brotli/shared_dictionary.h', + 'include/brotli/types.h', +] + +UNIFIED_SOURCES += [ + 'common/constants.c', + 'common/context.c', + 'common/dictionary.c', + 'common/platform.c', + 'common/shared_dictionary.c', + 'common/transform.c', + 'dec/bit_reader.c', + 'dec/decode.c', + 'dec/huffman.c', + 'dec/state.c', +] + +# We allow warnings for third-party code that can be updated from upstream. +AllowCompilerWarnings() + +CFLAGS += ['-DBROTLI_BUILD_PORTABLE'] + +Library('brotli') diff --git a/modules/brotli/moz.yaml b/modules/brotli/moz.yaml new file mode 100644 index 0000000000..2b57032e1c --- /dev/null +++ b/modules/brotli/moz.yaml @@ -0,0 +1,50 @@ +schema: 1 + +bugzilla: + product: Toolkit + component: "General" + +origin: + name: brotli + description: generic-purpose lossless compression algorithm + + url: https://github.com/google/brotli + + release: ed738e842d2fbdf2d6459e39267a633c4a9b2f5d (2023-08-29T11:00:29Z). + revision: ed738e842d2fbdf2d6459e39267a633c4a9b2f5d + + license: MIT + +vendoring: + url: https://github.com/google/brotli + source-hosting: github + tracking: commit + + exclude: + - ".*" + - "*" + - docs + - python + - scripts + - tests + - c/enc + - c/tools + + include: + - c/include/ + - c/common/ + - c/dec/ + + keep: + - LICENSE + + update-actions: + - action: move-dir + from: '{vendor_dir}/c/include' + to: '{vendor_dir}/include' + - action: move-dir + from: '{vendor_dir}/c/common' + to: '{vendor_dir}/common' + - action: move-dir + from: '{vendor_dir}/c/dec' + to: '{vendor_dir}/dec' |