| /* |
| * Copyright (c) 2016, Alliance for Open Media. All rights reserved |
| * |
| * This source code is subject to the terms of the BSD 2 Clause License and |
| * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License |
| * was not distributed with this source code in the LICENSE file, you can |
| * obtain it at www.aomedia.org/license/software. If the Alliance for Open |
| * Media Patent License 1.0 was not distributed with this source code in the |
| * PATENTS file, you can obtain it at www.aomedia.org/license/patent. |
| */ |
| |
| #include "aom_dsp/bitreader.h" |
| |
| int aom_reader_init(aom_reader *r, const uint8_t *buffer, size_t size) { |
| if (size && !buffer) { |
| return 1; |
| } |
| r->buffer_end = buffer + size; |
| r->buffer = buffer; |
| od_ec_dec_init(&r->ec, buffer, (uint32_t)size); |
| #if CONFIG_ACCOUNTING |
| r->accounting = NULL; |
| #endif |
| return 0; |
| } |
| |
| const uint8_t *aom_reader_find_begin(aom_reader *r) { return r->buffer; } |
| |
| const uint8_t *aom_reader_find_end(aom_reader *r) { return r->buffer_end; } |
| |
| uint32_t aom_reader_tell(const aom_reader *r) { return od_ec_dec_tell(&r->ec); } |
| |
| uint32_t aom_reader_tell_frac(const aom_reader *r) { |
| return od_ec_dec_tell_frac(&r->ec); |
| } |
| |
| int aom_reader_has_overflowed(const aom_reader *r) { |
| const uint32_t tell_bits = aom_reader_tell(r); |
| const uint32_t tell_bytes = (tell_bits + 7) >> 3; |
| return ((ptrdiff_t)tell_bytes > r->buffer_end - r->buffer); |
| } |