mirror of https://git.tukaani.org/xz.git
71 lines
1.9 KiB
C
71 lines
1.9 KiB
C
///////////////////////////////////////////////////////////////////////////////
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//
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/// \file subblock_decoder_helper.c
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/// \brief Helper filter for the Subblock decoder
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///
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/// This filter is used to indicate End of Input for subfilters needing it.
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//
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// Author: Lasse Collin
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//
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// This file has been put into the public domain.
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// You can do whatever you want with this file.
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//
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///////////////////////////////////////////////////////////////////////////////
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#include "subblock_decoder_helper.h"
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struct lzma_coder_s {
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const lzma_options_subblock_helper *options;
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};
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static lzma_ret
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helper_decode(lzma_coder *coder,
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lzma_allocator *allocator lzma_attribute((unused)),
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const uint8_t *restrict in, size_t *restrict in_pos,
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size_t in_size, uint8_t *restrict out,
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size_t *restrict out_pos, size_t out_size,
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lzma_action action lzma_attribute((unused)))
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{
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// If end_was_reached is true, we cannot have any input.
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assert(!coder->options->end_was_reached || *in_pos == in_size);
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// We can safely copy as much as possible, because we are never
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// given more data than a single Subblock Data field.
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lzma_bufcpy(in, in_pos, in_size, out, out_pos, out_size);
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// Return LZMA_STREAM_END when instructed so by the Subblock decoder.
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return coder->options->end_was_reached ? LZMA_STREAM_END : LZMA_OK;
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}
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static void
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helper_end(lzma_coder *coder, lzma_allocator *allocator)
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{
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lzma_free(coder, allocator);
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return;
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}
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extern lzma_ret
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lzma_subblock_decoder_helper_init(lzma_next_coder *next,
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lzma_allocator *allocator, const lzma_filter_info *filters)
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{
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// This is always the last filter in the chain.
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assert(filters[1].init == NULL);
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if (next->coder == NULL) {
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next->coder = lzma_alloc(sizeof(lzma_coder), allocator);
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if (next->coder == NULL)
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return LZMA_MEM_ERROR;
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next->code = &helper_decode;
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next->end = &helper_end;
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}
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next->coder->options = filters[0].options;
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return LZMA_OK;
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}
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