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