mirror of
https://github.com/google/brotli.git
synced 2024-12-27 10:20:17 +00:00
49 lines
1.2 KiB
C
49 lines
1.2 KiB
C
/* Copyright 2013 Google Inc. All Rights Reserved.
|
|
|
|
Distributed under MIT license.
|
|
See file LICENSE for detail or copy at https://opensource.org/licenses/MIT
|
|
*/
|
|
|
|
/* Bit reading helpers */
|
|
|
|
#include "./bit_reader.h"
|
|
|
|
#include <brotli/types.h>
|
|
#include "./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 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;
|
|
}
|
|
|
|
#if defined(__cplusplus) || defined(c_plusplus)
|
|
} /* extern "C" */
|
|
#endif
|