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-rw-r--r--modules/brotli/dec/bit_reader.c76
-rw-r--r--modules/brotli/dec/bit_reader.h351
-rw-r--r--modules/brotli/dec/decode.c2608
-rw-r--r--modules/brotli/dec/huffman.c339
-rw-r--r--modules/brotli/dec/huffman.h121
-rw-r--r--modules/brotli/dec/prefix.h732
-rw-r--r--modules/brotli/dec/state.c159
-rw-r--r--modules/brotli/dec/state.h365
8 files changed, 4751 insertions, 0 deletions
diff --git a/modules/brotli/dec/bit_reader.c b/modules/brotli/dec/bit_reader.c
new file mode 100644
index 0000000000..7f7b256a40
--- /dev/null
+++ b/modules/brotli/dec/bit_reader.c
@@ -0,0 +1,76 @@
+/* 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 "../common/platform.h"
+#include <brotli/types.h>
+
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+const uint32_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_ = sizeof(br->val_) << 3;
+}
+
+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_ALIGNED_READ) {
+ aligned_read_mask = 0;
+ }
+ if (BrotliGetAvailableBits(br) == 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,
+ uint32_t n_bits, uint32_t* val) {
+ uint32_t low_val;
+ uint32_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..22bc060cad
--- /dev/null
+++ b/modules/brotli/dec/bit_reader.h
@@ -0,0 +1,351 @@
+/* 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 "../common/constants.h"
+#include "../common/platform.h"
+#include <brotli/types.h>
+
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+#define BROTLI_SHORT_FILL_BIT_WINDOW_READ (sizeof(brotli_reg_t) >> 1)
+
+BROTLI_INTERNAL extern const uint32_t kBrotliBitMask[33];
+
+static BROTLI_INLINE uint32_t BitMask(uint32_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 ~((0xFFFFFFFFu) << n);
+ } else {
+ return kBrotliBitMask[n];
+ }
+}
+
+typedef struct {
+ brotli_reg_t val_; /* pre-fetched bits */
+ uint32_t bit_pos_; /* current bit-reading position in val_ */
+ const uint8_t* next_in; /* the byte we're reading from */
+ size_t avail_in;
+} BrotliBitReader;
+
+typedef struct {
+ brotli_reg_t val_;
+ uint32_t bit_pos_;
+ const uint8_t* next_in;
+ size_t avail_in;
+} BrotliBitReaderState;
+
+/* Initializes the BrotliBitReader fields. */
+BROTLI_INTERNAL void BrotliInitBitReader(BrotliBitReader* const 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_ALIGNED_READ this function also prepares bit reader for aligned
+ reading. */
+BROTLI_INTERNAL BROTLI_BOOL BrotliWarmupBitReader(BrotliBitReader* const 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* const br, uint32_t n_bits, uint32_t* val);
+
+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 = from->avail_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;
+ to->avail_in = from->avail_in;
+}
+
+static BROTLI_INLINE uint32_t BrotliGetAvailableBits(
+ const BrotliBitReader* br) {
+ return (BROTLI_64_BITS ? 64 : 32) - 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;
+ if (br->avail_in > kCap) return kCap;
+ return br->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, size_t num) {
+ return TO_BROTLI_BOOL(br->avail_in >= num);
+}
+
+/* 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, uint32_t n_bits) {
+#if (BROTLI_64_BITS)
+ if (!BROTLI_ALIGNED_READ && BROTLI_IS_CONSTANT(n_bits) && (n_bits <= 8)) {
+ if (br->bit_pos_ >= 56) {
+ br->val_ >>= 56;
+ br->bit_pos_ ^= 56; /* here same as -= 56 because of the if condition */
+ br->val_ |= BROTLI_UNALIGNED_LOAD64LE(br->next_in) << 8;
+ br->avail_in -= 7;
+ br->next_in += 7;
+ }
+ } else if (
+ !BROTLI_ALIGNED_READ && BROTLI_IS_CONSTANT(n_bits) && (n_bits <= 16)) {
+ if (br->bit_pos_ >= 48) {
+ br->val_ >>= 48;
+ br->bit_pos_ ^= 48; /* here same as -= 48 because of the if condition */
+ br->val_ |= BROTLI_UNALIGNED_LOAD64LE(br->next_in) << 16;
+ br->avail_in -= 6;
+ br->next_in += 6;
+ }
+ } else {
+ if (br->bit_pos_ >= 32) {
+ br->val_ >>= 32;
+ br->bit_pos_ ^= 32; /* here same as -= 32 because of the if condition */
+ br->val_ |= ((uint64_t)BROTLI_UNALIGNED_LOAD32LE(br->next_in)) << 32;
+ br->avail_in -= BROTLI_SHORT_FILL_BIT_WINDOW_READ;
+ br->next_in += BROTLI_SHORT_FILL_BIT_WINDOW_READ;
+ }
+ }
+#else
+ if (!BROTLI_ALIGNED_READ && BROTLI_IS_CONSTANT(n_bits) && (n_bits <= 8)) {
+ if (br->bit_pos_ >= 24) {
+ br->val_ >>= 24;
+ br->bit_pos_ ^= 24; /* here same as -= 24 because of the if condition */
+ br->val_ |= BROTLI_UNALIGNED_LOAD32LE(br->next_in) << 8;
+ br->avail_in -= 3;
+ br->next_in += 3;
+ }
+ } else {
+ if (br->bit_pos_ >= 16) {
+ br->val_ >>= 16;
+ br->bit_pos_ ^= 16; /* here same as -= 16 because of the if condition */
+ br->val_ |= ((uint32_t)BROTLI_UNALIGNED_LOAD16LE(br->next_in)) << 16;
+ br->avail_in -= BROTLI_SHORT_FILL_BIT_WINDOW_READ;
+ 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->avail_in == 0) {
+ return BROTLI_FALSE;
+ }
+ br->val_ >>= 8;
+#if (BROTLI_64_BITS)
+ br->val_ |= ((uint64_t)*br->next_in) << 56;
+#else
+ br->val_ |= ((uint32_t)*br->next_in) << 24;
+#endif
+ br->bit_pos_ -= 8;
+ --br->avail_in;
+ ++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_ >> br->bit_pos_;
+}
+
+/* Like BrotliGetBits, but does not mask the result.
+ The result contains at least 16 valid bits. */
+static BROTLI_INLINE uint32_t BrotliGet16BitsUnmasked(
+ BrotliBitReader* const br) {
+ BrotliFillBitWindow(br, 16);
+ return (uint32_t)BrotliGetBitsUnmasked(br);
+}
+
+/* Returns the specified number of bits from |br| without advancing bit
+ position. */
+static BROTLI_INLINE uint32_t BrotliGetBits(
+ BrotliBitReader* const br, uint32_t n_bits) {
+ BrotliFillBitWindow(br, n_bits);
+ return (uint32_t)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, uint32_t n_bits, uint32_t* val) {
+ while (BrotliGetAvailableBits(br) < n_bits) {
+ if (!BrotliPullByte(br)) {
+ return BROTLI_FALSE;
+ }
+ }
+ *val = (uint32_t)BrotliGetBitsUnmasked(br) & BitMask(n_bits);
+ return BROTLI_TRUE;
+}
+
+/* Advances the bit pos by |n_bits|. */
+static BROTLI_INLINE void BrotliDropBits(
+ BrotliBitReader* const br, uint32_t n_bits) {
+ br->bit_pos_ += n_bits;
+}
+
+static BROTLI_INLINE void BrotliBitReaderUnload(BrotliBitReader* br) {
+ uint32_t unused_bytes = BrotliGetAvailableBits(br) >> 3;
+ uint32_t unused_bits = unused_bytes << 3;
+ br->avail_in += unused_bytes;
+ br->next_in -= unused_bytes;
+ if (unused_bits == sizeof(br->val_) << 3) {
+ br->val_ = 0;
+ } else {
+ br->val_ <<= unused_bits;
+ }
+ br->bit_pos_ += unused_bits;
+}
+
+/* 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, uint32_t n_bits, uint32_t* val) {
+ *val = (uint32_t)BrotliGetBitsUnmasked(br) & BitMask(n_bits);
+ BROTLI_LOG(("[BrotliTakeBits] %d %d %d val: %6x\n",
+ (int)br->avail_in, (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 uint32_t BrotliReadBits24(
+ BrotliBitReader* const br, uint32_t n_bits) {
+ BROTLI_DCHECK(n_bits <= 24);
+ if (BROTLI_64_BITS || (n_bits <= 16)) {
+ uint32_t val;
+ BrotliFillBitWindow(br, n_bits);
+ BrotliTakeBits(br, n_bits, &val);
+ return val;
+ } else {
+ uint32_t low_val;
+ uint32_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 uint32_t BrotliReadBits32(
+ BrotliBitReader* const br, uint32_t n_bits) {
+ BROTLI_DCHECK(n_bits <= 32);
+ if (BROTLI_64_BITS || (n_bits <= 16)) {
+ uint32_t val;
+ BrotliFillBitWindow(br, n_bits);
+ BrotliTakeBits(br, n_bits, &val);
+ return val;
+ } else {
+ uint32_t low_val;
+ uint32_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, uint32_t n_bits, uint32_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, uint32_t n_bits, uint32_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) {
+ uint32_t pad_bits_count = BrotliGetAvailableBits(br) & 0x7;
+ uint32_t pad_bits = 0;
+ if (pad_bits_count != 0) {
+ BrotliTakeBits(br, pad_bits_count, &pad_bits);
+ }
+ return TO_BROTLI_BOOL(pad_bits == 0);
+}
+
+/* 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;
+ }
+ memcpy(dest, br->next_in, num);
+ br->avail_in -= num;
+ br->next_in += num;
+}
+
+#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..ae5a3d3fa3
--- /dev/null
+++ b/modules/brotli/dec/decode.c
@@ -0,0 +1,2608 @@
+/* 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/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:
+ 5 prefix + 24 base + 8 suffix */
+static const uint32_t kRingBufferWriteAheadSlack = 42;
+
+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) {
+ s->error_code = (int)e;
+ 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) {
+ uint32_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 = 17 + n;
+ 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 = 8 + n;
+ 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, uint32_t* value) {
+ uint32_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);
+ }
+}
+
+/* Decodes a metablock length and flags by reading 2 - 31 bits. */
+static BrotliDecoderErrorCode BROTLI_NOINLINE DecodeMetaBlockLength(
+ BrotliDecoderState* s, BrotliBitReader* br) {
+ uint32_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);
+ }
+ }
+}
+
+/* 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 uint32_t DecodeSymbol(uint32_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) {
+ uint32_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 uint32_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, uint32_t* result) {
+ uint32_t val;
+ uint32_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 = (uint32_t)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, uint32_t* result) {
+ uint32_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,
+ uint32_t* bits,
+ uint32_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 uint32_t ReadPreloadedSymbol(const HuffmanCode* table,
+ BrotliBitReader* br,
+ uint32_t* bits,
+ uint32_t* value) {
+ uint32_t result = *value;
+ if (BROTLI_PREDICT_FALSE(*bits > HUFFMAN_TABLE_BITS)) {
+ uint32_t val = BrotliGet16BitsUnmasked(br);
+ const HuffmanCode* ext = table + (val & HUFFMAN_TABLE_MASK) + *value;
+ uint32_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 uint32_t Log2Floor(uint32_t x) {
+ uint32_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(
+ uint32_t alphabet_size_max, uint32_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;
+ uint32_t max_bits = Log2Floor(alphabet_size_max - 1);
+ uint32_t i = h->sub_loop_counter;
+ uint32_t num_symbols = h->symbol;
+ while (i <= num_symbols) {
+ uint32_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) {
+ uint32_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(uint32_t code_len,
+ uint32_t* symbol, uint32_t* repeat, uint32_t* space,
+ uint32_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(uint32_t code_len,
+ uint32_t repeat_delta, uint32_t alphabet_size, uint32_t* symbol,
+ uint32_t* repeat, uint32_t* space, uint32_t* prev_code_len,
+ uint32_t* repeat_code_len, uint16_t* symbol_lists,
+ uint16_t* code_length_histo, int* next_symbol) {
+ uint32_t old_repeat;
+ uint32_t extra_bits = 3; /* for BROTLI_REPEAT_ZERO_CODE_LENGTH */
+ uint32_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) {
+ unsigned 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(
+ uint32_t alphabet_size, BrotliDecoderState* s) {
+ BrotliBitReader* br = &s->br;
+ BrotliMetablockHeaderArena* h = &s->arena.header;
+ uint32_t symbol = h->symbol;
+ uint32_t repeat = h->repeat;
+ uint32_t space = h->space;
+ uint32_t prev_code_len = h->prev_code_len;
+ uint32_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;
+ uint32_t code_len;
+ BROTLI_HC_MARK_TABLE_FOR_FAST_LOAD(p);
+ if (!BrotliCheckInputAmount(br, BROTLI_SHORT_FILL_BIT_WINDOW_READ)) {
+ 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 */
+ uint32_t extra_bits =
+ (code_len == BROTLI_REPEAT_PREVIOUS_CODE_LENGTH) ? 2 : 3;
+ uint32_t repeat_delta =
+ (uint32_t)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(
+ uint32_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;
+ uint32_t code_len;
+ uint32_t available_bits;
+ uint32_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 */
+ uint32_t extra_bits = code_len - 14U;
+ uint32_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;
+ uint32_t num_codes = h->repeat;
+ unsigned space = h->space;
+ uint32_t i = h->sub_loop_counter;
+ for (; i < BROTLI_CODE_LENGTH_CODES; ++i) {
+ const uint8_t code_len_idx = kCodeLengthCodeOrder[i];
+ uint32_t ix;
+ uint32_t v;
+ if (BROTLI_PREDICT_FALSE(!BrotliSafeGetBits(br, 4, &ix))) {
+ uint32_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(uint32_t alphabet_size_max,
+ uint32_t alphabet_size_limit,
+ HuffmanCode* table,
+ uint32_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: {
+ uint32_t table_size;
+ if (h->symbol == 3) {
+ uint32_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, 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: {
+ uint32_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: {
+ uint32_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);
+ }
+ }
+}
+
+/* Decodes a block length by reading 3..39 bits. */
+static BROTLI_INLINE uint32_t ReadBlockLength(const HuffmanCode* table,
+ BrotliBitReader* br) {
+ uint32_t code;
+ uint32_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, uint32_t* result, const HuffmanCode* table,
+ BrotliBitReader* br) {
+ uint32_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;
+ }
+ {
+ uint32_t bits;
+ uint32_t nbits = _kBrotliPrefixCodeRanges[index].nbits;
+ uint32_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, uint32_t v_len, BrotliDecoderState* state) {
+ /* Reinitialize elements that could have been changed. */
+ uint32_t i = 1;
+ uint32_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) {
+ uint32_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(uint32_t context_map_size,
+ uint32_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: {
+ uint32_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: {
+ uint32_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: {
+ uint32_t context_index = h->context_index;
+ uint32_t max_run_length_prefix = h->max_run_length_prefix;
+ uint8_t* context_map = *context_map_arg;
+ uint32_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. */
+ {
+ uint32_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: {
+ uint32_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);
+ }
+}
+
+/* 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) {
+ uint32_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;
+ uint32_t* ringbuffer = &s->block_type_rb[tree_type * 2];
+ uint32_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);) {
+ 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;
+ uint32_t block_type = s->block_type_rb[1];
+ uint32_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 CopyUncompressedBlockToOutput(
+ size_t* available_out, uint8_t** next_out, size_t* total_out,
+ BrotliDecoderState* s) {
+ /* TODO: 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 */
+}
+
+/* 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]) {
+ uint32_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, uint32_t n_bits, uint32_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, uint32_t n_bits, uint32_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;
+ uint32_t npostfix = s->distance_postfix_bits;
+ uint32_t ndirect = s->num_direct_distance_codes;
+ uint32_t alphabet_size_limit = s->distance_hgroup.alphabet_size_limit;
+ uint32_t postfix = 1u << npostfix;
+ uint32_t j;
+ uint32_t bits = 1;
+ uint32_t half = 0;
+
+ /* Skip short codes. */
+ uint32_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) {
+ uint32_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;
+ uint32_t code;
+ uint32_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) {
+ uint32_t cmd_code;
+ uint32_t insert_len_extra = 0;
+ uint32_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, &copy_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, size_t num) {
+ if (safe) {
+ return BROTLI_TRUE;
+ }
+ return BrotliCheckInputAmount(br, num);
+}
+
+#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;
+
+ if (!CheckInputAmount(safe, br, 28)) {
+ 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);
+ }
+
+CommandBegin:
+ if (safe) {
+ s->state = BROTLI_STATE_COMMAND_BEGIN;
+ }
+ if (!CheckInputAmount(safe, br, 28)) { /* 156 bits + 7 bytes */
+ 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) {
+ uint32_t bits;
+ uint32_t value;
+ PreloadSymbol(safe, s->literal_htree, br, &bits, &value);
+ do {
+ if (!CheckInputAmount(safe, br, 28)) { /* 162 bits + 7 bytes */
+ s->state = BROTLI_STATE_COMMAND_INNER;
+ result = BROTLI_DECODER_NEEDS_MORE_INPUT;
+ goto saveStateAndReturn;
+ }
+ if (BROTLI_PREDICT_FALSE(s->block_length[0] == 0)) {
+ BROTLI_SAFE(DecodeLiteralBlockSwitch(s));
+ PreloadSymbol(safe, s->literal_htree, br, &bits, &value);
+ if (!s->trivial_literal_context) goto CommandInner;
+ }
+ if (!safe) {
+ s->ringbuffer[pos] =
+ (uint8_t)ReadPreloadedSymbol(s->literal_htree, br, &bits, &value);
+ } else {
+ uint32_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, 28)) { /* 162 bits + 7 bytes */
+ s->state = BROTLI_STATE_COMMAND_INNER;
+ result = BROTLI_DECODER_NEEDS_MORE_INPUT;
+ goto saveStateAndReturn;
+ }
+ if (BROTLI_PREDICT_FALSE(s->block_length[0] == 0)) {
+ BROTLI_SAFE(DecodeLiteralBlockSwitch(s));
+ if (s->trivial_literal_context) goto CommandInner;
+ }
+ 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 {
+ uint32_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 (i >= BROTLI_MIN_DICTIONARY_WORD_LENGTH &&
+ i <= BROTLI_MAX_DICTIONARY_WORD_LENGTH) {
+ int address = s->distance_code - s->max_distance - 1;
+ const BrotliDictionary* words = s->dictionary;
+ const BrotliTransforms* transforms = s->transforms;
+ int offset = (int)s->dictionary->offsets_by_length[i];
+ uint32_t shift = s->dictionary->size_bits_by_length[i];
+
+ 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 (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]));
+ }
+ 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;
+ }
+
+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, size_t* decoded_size,
+ uint8_t* decoded_buffer) {
+ 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;
+ /* 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 SaveErrorCode(
+ s, 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. */
+ br->avail_in = *available_in;
+ br->next_in = *next_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;
+ br->next_in = &s->buffer.u8[0];
+ }
+ /* 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->avail_in == 0) {
+ /* 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;
+ br->avail_in = *available_in;
+ br->next_in = *next_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;
+ s->buffer.u8[s->buffer_length] = **next_in;
+ s->buffer_length++;
+ br->avail_in = 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 = br->avail_in;
+ 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 = br->avail_in;
+ *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:
+ if (!BrotliSafeReadBits(br, 6, &s->window_bits)) {
+ result = BROTLI_DECODER_NEEDS_MORE_INPUT;
+ break;
+ }
+ 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;
+ 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: {
+ uint32_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: {
+ uint32_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:
+ for (; s->meta_block_remaining_len > 0; --s->meta_block_remaining_len) {
+ uint32_t bits;
+ /* Read one byte and ignore it. */
+ if (!BrotliSafeReadBits(br, 8, &bits)) {
+ result = BROTLI_DECODER_NEEDS_MORE_INPUT;
+ break;
+ }
+ }
+ if (result == BROTLI_DECODER_SUCCESS) {
+ s->state = BROTLI_STATE_METABLOCK_DONE;
+ }
+ break;
+
+ case BROTLI_STATE_METABLOCK_HEADER_2: {
+ uint32_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: {
+ uint32_t npostfix = s->distance_postfix_bits;
+ uint32_t ndirect = s->num_direct_distance_codes;
+ uint32_t distance_alphabet_size_max = BROTLI_DISTANCE_ALPHABET_SIZE(
+ npostfix, ndirect, BROTLI_MAX_DISTANCE_BITS);
+ uint32_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, npostfix, 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 SaveErrorCode(s,
+ 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 SaveErrorCode(s, BROTLI_FAILURE(
+ BROTLI_DECODER_ERROR_UNREACHABLE));
+ }
+ 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) {
+ 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 = br->avail_in;
+ *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 SaveErrorCode(s, result);
+ }
+ }
+ return SaveErrorCode(s, result);
+}
+
+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);
+ *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 #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() {
+ return BROTLI_VERSION;
+}
+
+#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..30c40d33f2
--- /dev/null
+++ b/modules/brotli/dec/huffman.c
@@ -0,0 +1,339 @@
+/* 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 "../common/constants.h"
+#include "../common/platform.h"
+#include <brotli/types.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);
+
+ /* Generate offsets into sorted symbol table by code length. */
+ symbol = -1;
+ bits = 1;
+ BROTLI_REPEAT(BROTLI_HUFFMAN_MAX_CODE_LENGTH_CODE_LENGTH, {
+ 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..a8fbc45347
--- /dev/null
+++ b/modules/brotli/dec/huffman.h
@@ -0,0 +1,121 @@
+/* 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 "../common/platform.h"
+#include <brotli/types.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..481a2c7917
--- /dev/null
+++ b/modules/brotli/dec/prefix.h
@@ -0,0 +1,732 @@
+/* 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 "../common/constants.h"
+#include <brotli/types.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, 0x00, -1, 0x03, 0x000a, 0x0009 },
+ { 0x02, 0x00, -1, 0x00, 0x000e, 0x0002 },
+ { 0x02, 0x00, -1, 0x01, 0x000e, 0x0003 },
+ { 0x02, 0x00, -1, 0x02, 0x000e, 0x0004 },
+ { 0x02, 0x00, -1, 0x03, 0x000e, 0x0005 },
+ { 0x02, 0x00, -1, 0x03, 0x000e, 0x0006 },
+ { 0x02, 0x00, -1, 0x03, 0x000e, 0x0007 },
+ { 0x02, 0x00, -1, 0x03, 0x000e, 0x0008 },
+ { 0x02, 0x00, -1, 0x03, 0x000e, 0x0009 },
+ { 0x03, 0x00, -1, 0x00, 0x0012, 0x0002 },
+ { 0x03, 0x00, -1, 0x01, 0x0012, 0x0003 },
+ { 0x03, 0x00, -1, 0x02, 0x0012, 0x0004 },
+ { 0x03, 0x00, -1, 0x03, 0x0012, 0x0005 },
+ { 0x03, 0x00, -1, 0x03, 0x0012, 0x0006 },
+ { 0x03, 0x00, -1, 0x03, 0x0012, 0x0007 },
+ { 0x03, 0x00, -1, 0x03, 0x0012, 0x0008 },
+ { 0x03, 0x00, -1, 0x03, 0x0012, 0x0009 },
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+ { 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..f847836dda
--- /dev/null
+++ b/modules/brotli/dec/state.c
@@ -0,0 +1,159 @@
+/* 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 "./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->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->dictionary = BrotliGetDictionary();
+ s->transforms = BrotliGetTransforms();
+
+ return BROTLI_TRUE;
+}
+
+void BrotliDecoderStateMetablockBegin(BrotliDecoderState* s) {
+ s->meta_block_remaining_len = 0;
+ s->block_length[0] = 1U << 24;
+ s->block_length[1] = 1U << 24;
+ s->block_length[2] = 1U << 24;
+ 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);
+}
+
+void BrotliDecoderStateCleanup(BrotliDecoderState* s) {
+ BrotliDecoderStateCleanupAfterMetablock(s);
+
+ BROTLI_DECODER_FREE(s, s->ringbuffer);
+ BROTLI_DECODER_FREE(s, s->block_type_trees);
+}
+
+BROTLI_BOOL BrotliDecoderHuffmanTreeGroupInit(BrotliDecoderState* s,
+ HuffmanTreeGroup* group, uint32_t alphabet_size_max,
+ uint32_t alphabet_size_limit, uint32_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..54dab698ba
--- /dev/null
+++ b/modules/brotli/dec/state.h
@@ -0,0 +1,365 @@
+/* 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 "../common/constants.h"
+#include "../common/dictionary.h"
+#include "../common/platform.h"
+#include "../common/transform.h"
+#include <brotli/types.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;
+
+typedef struct BrotliMetablockHeaderArena {
+ BrotliRunningTreeGroupState substate_tree_group;
+ BrotliRunningContextMapState substate_context_map;
+ BrotliRunningHuffmanState substate_huffman;
+
+ uint32_t sub_loop_counter;
+
+ uint32_t repeat_code_len;
+ uint32_t prev_code_len;
+
+ /* For ReadHuffmanCode. */
+ uint32_t symbol;
+ uint32_t repeat;
+ uint32_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];
+
+ /* For HuffmanTreeGroupDecode. */
+ int htree_index;
+ HuffmanCode* next;
+
+ /* For DecodeContextMap. */
+ uint32_t context_index;
+ uint32_t max_run_length_prefix;
+ uint32_t code;
+ HuffmanCode context_map_table[BROTLI_HUFFMAN_MAX_SIZE_272];
+} BrotliMetablockHeaderArena;
+
+typedef struct BrotliMetablockBodyArena {
+ uint8_t dist_extra_bits[544];
+ uint32_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;
+ uint32_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;
+ 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;
+ int meta_block_remaining_len;
+ uint32_t block_length_index;
+ uint32_t block_length[3];
+ uint32_t num_block_types[3];
+ uint32_t block_type_rb[6];
+ uint32_t distance_postfix_bits;
+ uint32_t num_direct_distance_codes;
+ uint32_t num_dist_htrees;
+ uint8_t* dist_context_map;
+ HuffmanCode* literal_htree;
+ uint8_t dist_htree_index;
+
+ int copy_length;
+ int distance_code;
+
+ /* 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. */
+ uint32_t mtf_upper_bound;
+ uint32_t mtf[64 + 1];
+
+ /* Less used attributes are at the end of this struct. */
+
+ /* States inside function calls. */
+ BrotliRunningMetablockHeaderState substate_metablock_header;
+ BrotliRunningUncompressedState substate_uncompressed;
+ BrotliRunningDecodeUint8State substate_decode_uint8;
+ BrotliRunningReadBlockLengthState substate_read_block_length;
+
+ 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 size_nibbles : 8;
+ uint32_t window_bits;
+
+ int new_ringbuffer_size;
+
+ uint32_t num_literal_htrees;
+ uint8_t* context_map;
+ uint8_t* context_modes;
+
+ const BrotliDictionary* dictionary;
+ const BrotliTransforms* transforms;
+
+ 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, uint32_t alphabet_size_max,
+ uint32_t alphabet_size_limit, uint32_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; \
+}
+
+#if defined(__cplusplus) || defined(c_plusplus)
+} /* extern "C" */
+#endif
+
+#endif /* BROTLI_DEC_STATE_H_ */
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-11 18:55:47 +0000