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