mirror of https://git.tukaani.org/xz.git
66 lines
1.9 KiB
C
66 lines
1.9 KiB
C
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///////////////////////////////////////////////////////////////////////////////
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//
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/// \file next_coder.c
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/// \brief Initializing and freeing the next coder in the chain
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//
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// Copyright (C) 2007 Lasse Collin
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 2.1 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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///////////////////////////////////////////////////////////////////////////////
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#include "common.h"
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extern lzma_ret
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lzma_next_filter_init(lzma_next_coder *next, lzma_allocator *allocator,
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const lzma_filter_info *filters)
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{
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lzma_ret ret = LZMA_OK;
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// Free the existing coder if it is different than the current one.
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if ((uintptr_t)(filters[0].init) != next->init)
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lzma_next_coder_end(next, allocator);
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if (filters[0].init != NULL) {
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// Initialize the new coder.
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ret = filters[0].init(next, allocator, filters);
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// Set the init function pointer if initialization was
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// successful. next->code and next->end are set by the
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// initialization function itself.
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if (ret == LZMA_OK) {
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next->init = (uintptr_t)(filters[0].init);
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assert(next->code != NULL);
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assert(next->end != NULL);
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} else {
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lzma_next_coder_end(next, allocator);
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}
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}
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return ret;
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}
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extern void
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lzma_next_coder_end(lzma_next_coder *next, lzma_allocator *allocator)
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{
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if (next != NULL) {
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if (next->end != NULL)
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next->end(next->coder, allocator);
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// Reset the variables so the we don't accidentally think
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// that it is an already initialized coder.
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*next = LZMA_NEXT_CODER_INIT;
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}
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return;
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}
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