aom_dsp/buf_ans.c

/*
 * 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 <string.h>

#include "aom_dsp/buf_ans.h"
#include "aom_mem/aom_mem.h"
#include "aom/internal/aom_codec_internal.h"

void aom_buf_ans_alloc(struct BufAnsCoder *c,
                       struct aom_internal_error_info *error, int size_hint) {
  c->error = error;
  c->size = size_hint;
  AOM_CHECK_MEM_ERROR(error, c->buf, aom_malloc(c->size * sizeof(*c->buf)));
  // Initialize to overfull to trigger the assert in write.
  c->offset = c->size + 1;
}

void aom_buf_ans_free(struct BufAnsCoder *c) {
  aom_free(c->buf);
  c->buf = NULL;
  c->size = 0;
}

void aom_buf_ans_grow(struct BufAnsCoder *c) {
  struct buffered_ans_symbol *new_buf = NULL;
  int new_size = c->size * 2;
  AOM_CHECK_MEM_ERROR(c->error, new_buf,
                      aom_malloc(new_size * sizeof(*new_buf)));
  memcpy(new_buf, c->buf, c->size * sizeof(*c->buf));
  aom_free(c->buf);
  c->buf = new_buf;
  c->size = new_size;
}