92 lines
2.5 KiB
C
92 lines
2.5 KiB
C
///////////////////////////////////////////////////////////////////////////////
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//
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/// \file filter_buffer_decoder.c
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/// \brief Single-call raw decoding
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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 "filter_decoder.h"
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extern LZMA_API(lzma_ret)
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lzma_raw_buffer_decode(const lzma_filter *filters, lzma_allocator *allocator,
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const uint8_t *in, size_t *in_pos, size_t in_size,
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uint8_t *out, size_t *out_pos, size_t out_size)
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{
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lzma_next_coder next = LZMA_NEXT_CODER_INIT;
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size_t in_start;
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size_t out_start;
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lzma_ret ret;
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// Validate what isn't validated later in filter_common.c.
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if (in == NULL || in_pos == NULL || *in_pos > in_size || out == NULL
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|| out_pos == NULL || *out_pos > out_size)
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return LZMA_PROG_ERROR;
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// Initialize the decoer.
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return_if_error(lzma_raw_decoder_init(&next, allocator, filters));
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// Store the positions so that we can restore them if something
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// goes wrong.
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in_start = *in_pos;
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out_start = *out_pos;
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// Do the actual decoding and free decoder's memory.
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ret = next.code(next.coder, allocator, in, in_pos, in_size,
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out, out_pos, out_size, LZMA_FINISH);
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if (ret == LZMA_STREAM_END) {
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ret = LZMA_OK;
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} else {
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if (ret == LZMA_OK) {
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// Either the input was truncated or the
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// output buffer was too small.
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assert(*in_pos == in_size || *out_pos == out_size);
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if (*in_pos != in_size) {
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// Since input wasn't consumed completely,
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// the output buffer became full and is
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// too small.
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ret = LZMA_BUF_ERROR;
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} else if (*out_pos != out_size) {
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// Since output didn't became full, the input
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// has to be truncated.
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ret = LZMA_DATA_ERROR;
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} else {
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// All the input was consumed and output
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// buffer is full. Now we don't immediately
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// know the reason for the error. Try
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// decoding one more byte. If it succeeds,
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// then the output buffer was too small. If
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// we cannot get a new output byte, the input
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// is truncated.
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uint8_t tmp[1];
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size_t tmp_pos = 0;
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(void)next.code(next.coder, allocator,
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in, in_pos, in_size,
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tmp, &tmp_pos, 1, LZMA_FINISH);
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if (tmp_pos == 1)
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ret = LZMA_BUF_ERROR;
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else
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ret = LZMA_DATA_ERROR;
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}
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}
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// Restore the positions.
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*in_pos = in_start;
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*out_pos = out_start;
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}
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lzma_next_end(&next, allocator);
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return ret;
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}
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