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/*
* 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);
}
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