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59 lines
1.6 KiB
C
59 lines
1.6 KiB
C
/* Copyright 2013 Google Inc. All Rights Reserved.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/* Bit reading helpers */
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#include <stdlib.h>
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#include "./bit_reader.h"
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#include "./port.h"
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#if defined(__cplusplus) || defined(c_plusplus)
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extern "C" {
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#endif
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void BrotliInitBitReader(BrotliBitReader* const br, BrotliInput input) {
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BROTLI_DCHECK(br != NULL);
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br->input_ = input;
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br->val_ = 0;
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br->bit_pos_ = sizeof(br->val_) << 3;
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br->avail_in = 0;
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br->eos_ = 0;
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br->next_in = br->buf_;
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}
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int BrotliWarmupBitReader(BrotliBitReader* const br) {
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size_t aligned_read_mask = (sizeof(br->val_) >> 1) - 1;
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/* Fixing alignment after unaligned BrotliFillWindow would result accumulator
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overflow. If unalignment is caused by BrotliSafeReadBits, then there is
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enough space in accumulator to fix aligment. */
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if (!BROTLI_ALIGNED_READ) {
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aligned_read_mask = 0;
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}
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while (br->bit_pos_ == (sizeof(br->val_) << 3) ||
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(((size_t)br->next_in) & aligned_read_mask) != 0) {
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if (!br->avail_in) {
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return 0;
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}
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BrotliPullByte(br);
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}
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return 1;
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}
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#if defined(__cplusplus) || defined(c_plusplus)
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} /* extern "C" */
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#endif
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