1/*
2 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11
12/* This code is in the public domain.
13** Version: 1.1  Author: Walt Karas
14*/
15
16#include "hmm_intrnl.h"
17
18void U(grow_chunk)(U(descriptor) *desc, void *end, U(size_bau) n_baus) {
19#undef HEAD_PTR
20#define HEAD_PTR ((head_record *) end)
21
22  end = BAUS_BACKWARD(end, DUMMY_END_BLOCK_BAUS);
23
24#ifdef HMM_AUDIT_FAIL
25
26  if (HEAD_PTR->block_size != 0)
27    /* Chunk does not have valid dummy end block. */
28    HMM_AUDIT_FAIL
29
30#endif
31
32    /* Create a new block that absorbs the old dummy end block. */
33    HEAD_PTR->block_size = n_baus;
34
35  /* Set up the new dummy end block. */
36  {
37    head_record *dummy = (head_record *) BAUS_FORWARD(end, n_baus);
38    dummy->previous_block_size = n_baus;
39    dummy->block_size = 0;
40  }
41
42  /* Simply free the new block, allowing it to coalesce with any
43  ** free block at that was the last block in the chunk prior to
44  ** growth.
45  */
46  U(free)(desc, HEAD_TO_PTR_REC(end));
47
48#undef HEAD_PTR
49}
50