ref: bb3d510a18350eb44038897187b1c4b28da86200
dir: /vpx_mem/memory_manager/hmm_grow.c/
/*
* Copyright (c) 2010 The WebM project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
/* This code is in the public domain.
** Version: 1.1 Author: Walt Karas
*/
#include "hmm_intrnl.h"
void U(grow_chunk)(U(descriptor) *desc, void *end, U(size_bau) n_baus)
{
#undef HEAD_PTR
#define HEAD_PTR ((head_record *) end)
end = BAUS_BACKWARD(end, DUMMY_END_BLOCK_BAUS);
#ifdef HMM_AUDIT_FAIL
if (HEAD_PTR->block_size != 0)
/* Chunk does not have valid dummy end block. */
HMM_AUDIT_FAIL
#endif
/* Create a new block that absorbs the old dummy end block. */
HEAD_PTR->block_size = n_baus;
/* Set up the new dummy end block. */
{
head_record *dummy = (head_record *) BAUS_FORWARD(end, n_baus);
dummy->previous_block_size = n_baus;
dummy->block_size = 0;
}
/* Simply free the new block, allowing it to coalesce with any
** free block at that was the last block in the chunk prior to
** growth.
*/
U(free)(desc, HEAD_TO_PTR_REC(end));
#undef HEAD_PTR
}