/* 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/types.h" | |
#include "./port.h" | |
#if defined(__cplusplus) || defined(c_plusplus) | |
extern "C" { | |
#endif | |
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 aligment. */ | |
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; | |
} | |
#if defined(__cplusplus) || defined(c_plusplus) | |
} /* extern "C" */ | |
#endif |