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Diffstat (limited to 'web/server/h2o/libh2o/deps/brotli/enc/write_bits.h')
-rw-r--r-- | web/server/h2o/libh2o/deps/brotli/enc/write_bits.h | 84 |
1 files changed, 0 insertions, 84 deletions
diff --git a/web/server/h2o/libh2o/deps/brotli/enc/write_bits.h b/web/server/h2o/libh2o/deps/brotli/enc/write_bits.h deleted file mode 100644 index b605203a3..000000000 --- a/web/server/h2o/libh2o/deps/brotli/enc/write_bits.h +++ /dev/null @@ -1,84 +0,0 @@ -/* Copyright 2010 Google Inc. All Rights Reserved. - - Distributed under MIT license. - See file LICENSE for detail or copy at https://opensource.org/licenses/MIT -*/ - -// Write bits into a byte array. - -#ifndef BROTLI_ENC_WRITE_BITS_H_ -#define BROTLI_ENC_WRITE_BITS_H_ - -#include <assert.h> -#include <stdio.h> - -#include "./port.h" -#include "./types.h" - -namespace brotli { - -//#define BIT_WRITER_DEBUG - -// This function writes bits into bytes in increasing addresses, and within -// a byte least-significant-bit first. -// -// The function can write up to 56 bits in one go with WriteBits -// Example: let's assume that 3 bits (Rs below) have been written already: -// -// BYTE-0 BYTE+1 BYTE+2 -// -// 0000 0RRR 0000 0000 0000 0000 -// -// Now, we could write 5 or less bits in MSB by just sifting by 3 -// and OR'ing to BYTE-0. -// -// For n bits, we take the last 5 bits, OR that with high bits in BYTE-0, -// and locate the rest in BYTE+1, BYTE+2, etc. -inline void WriteBits(size_t n_bits, - uint64_t bits, - size_t * __restrict pos, - uint8_t * __restrict array) { -#ifdef BIT_WRITER_DEBUG - printf("WriteBits %2d 0x%016llx %10d\n", n_bits, bits, *pos); -#endif - assert((bits >> n_bits) == 0); - assert(n_bits <= 56); -#ifdef IS_LITTLE_ENDIAN - // This branch of the code can write up to 56 bits at a time, - // 7 bits are lost by being perhaps already in *p and at least - // 1 bit is needed to initialize the bit-stream ahead (i.e. if 7 - // bits are in *p and we write 57 bits, then the next write will - // access a byte that was never initialized). - uint8_t *p = &array[*pos >> 3]; - uint64_t v = *p; - v |= bits << (*pos & 7); - BROTLI_UNALIGNED_STORE64(p, v); // Set some bits. - *pos += n_bits; -#else - // implicit & 0xff is assumed for uint8_t arithmetics - uint8_t *array_pos = &array[*pos >> 3]; - const size_t bits_reserved_in_first_byte = (*pos & 7); - bits <<= bits_reserved_in_first_byte; - *array_pos++ |= static_cast<uint8_t>(bits); - for (size_t bits_left_to_write = n_bits + bits_reserved_in_first_byte; - bits_left_to_write >= 9; - bits_left_to_write -= 8) { - bits >>= 8; - *array_pos++ = static_cast<uint8_t>(bits); - } - *array_pos = 0; - *pos += n_bits; -#endif -} - -inline void WriteBitsPrepareStorage(size_t pos, uint8_t *array) { -#ifdef BIT_WRITER_DEBUG - printf("WriteBitsPrepareStorage %10d\n", pos); -#endif - assert((pos & 7) == 0); - array[pos >> 3] = 0; -} - -} // namespace brotli - -#endif // BROTLI_ENC_WRITE_BITS_H_ |