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| 1 /* Copyright 2013 Google Inc. All Rights Reserved. | |
| 2 | |
| 3 Licensed under the Apache License, Version 2.0 (the "License"); | |
| 4 you may not use this file except in compliance with the License. | |
| 5 You may obtain a copy of the License at | |
| 6 | |
| 7 http://www.apache.org/licenses/LICENSE-2.0 | |
| 8 | |
| 9 Unless required by applicable law or agreed to in writing, software | |
| 10 distributed under the License is distributed on an "AS IS" BASIS, | |
| 11 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
| 12 See the License for the specific language governing permissions and | |
| 13 limitations under the License. | |
| 14 | |
| 15 Bit reading helpers | |
| 16 */ | |
| 17 | |
| 18 #include <assert.h> | |
| 19 #include <stdlib.h> | |
| 20 | |
| 21 #include "./bit_reader.h" | |
| 22 | |
| 23 #if defined(__cplusplus) || defined(c_plusplus) | |
| 24 extern "C" { | |
| 25 #endif | |
| 26 | |
| 27 int BrotliInitBitReader(BrotliBitReader* const br, BrotliInput input) { | |
| 28 size_t i; | |
| 29 assert(br != NULL); | |
| 30 | |
| 31 br->buf_ptr_ = br->buf_; | |
| 32 br->input_ = input; | |
| 33 br->val_ = 0; | |
| 34 br->pos_ = 0; | |
| 35 br->bit_pos_ = 0; | |
| 36 br->bit_end_pos_ = 0; | |
| 37 br->eos_ = 0; | |
| 38 if (!BrotliReadMoreInput(br)) { | |
| 39 return 0; | |
| 40 } | |
| 41 for (i = 0; i < sizeof(br->val_); ++i) { | |
| 42 br->val_ |= ((uint64_t)br->buf_[br->pos_]) << (8 * i); | |
| 43 ++br->pos_; | |
| 44 } | |
| 45 return (br->bit_end_pos_ > 0); | |
| 46 } | |
| 47 | |
| 48 #if defined(__cplusplus) || defined(c_plusplus) | |
| 49 } /* extern "C" */ | |
| 50 #endif | |
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