brotli/dec/bit_reader.c

// Copyright 2013 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
//
// Bit reading helpers

#include <assert.h>
#include <stdlib.h>

#include "./bit_reader.h"

#if defined(__cplusplus) || defined(c_plusplus)
extern "C" {
#endif

int BrotliInitBitReader(BrotliBitReader* const br, BrotliInput input) {
  size_t i;
  assert(br != NULL);

  br->input_ = input;
  br->val_ = 0;
  br->pos_ = 0;
  br->bit_pos_ = 0;
  br->end_pos_ = 0;
  br->eos_ = 0;
  if (!BrotliReadMoreInput(br)) {
    return 0;
  }
  for (i = 0; i < sizeof(br->val_); ++i) {
    br->val_ |= ((uint64_t)br->buf_[br->pos_]) << (8 * i);
    ++br->pos_;
  }
  return (br->end_pos_ > 0);
}

#if defined(__cplusplus) || defined(c_plusplus)
}    // extern "C"
#endif