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Fix decoding of Blocks that have only Block Header.

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This commit is contained in:
Lasse Collin 2008-01-08 22:58:42 +02:00
parent 753e4d95cd
commit 7054c5f588
1 changed files with 14 additions and 23 deletions
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35
src/liblzma/common/block_decoder.c
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@ -345,28 +345,7 @@ lzma_block_decoder_init(lzma_next_coder *next, lzma_allocator *allocator,
return_if_error(lzma_check_init(&next->coder->check, options->check)); return_if_error(lzma_check_init(&next->coder->check, options->check));
if (!options->has_eopm && options->uncompressed_size == 0) {
if (!is_size_valid(0, options->compressed_size))
return LZMA_PROG_ERROR;
if (options->check != LZMA_CHECK_NONE) {
lzma_check_finish(&next->coder->check, options->check);
next->coder->sequence = SEQ_CHECK;
} else if (options->handle_padding) {
next->coder->sequence = SEQ_PADDING;
} else {
next->coder->sequence = SEQ_END;
}
} else {
next->coder->sequence = SEQ_CODE; next->coder->sequence = SEQ_CODE;
}
return_if_error(lzma_raw_decoder_init(&next->coder->next, allocator,
options->filters, options->has_eopm
? LZMA_VLI_VALUE_UNKNOWN
: options->uncompressed_size,
true));
next->coder->options = options; next->coder->options = options;
next->coder->pos = 0; next->coder->pos = 0;
next->coder->total_size = options->header_size; next->coder->total_size = options->header_size;
@ -379,7 +358,19 @@ lzma_block_decoder_init(lzma_next_coder *next, lzma_allocator *allocator,
next->coder->tmp = 0; next->coder->tmp = 0;
next->coder->size_of_backward_size = 0; next->coder->size_of_backward_size = 0;
return LZMA_OK; if (!options->has_eopm && options->uncompressed_size == 0) {
// The Compressed Data field is empty, thus we skip SEQ_CODE
// phase completely.
const lzma_ret ret = update_sequence(next->coder);
if (ret != LZMA_OK && ret != LZMA_STREAM_END)
return LZMA_PROG_ERROR;
}
return lzma_raw_decoder_init(&next->coder->next, allocator,
options->filters, options->has_eopm
? LZMA_VLI_VALUE_UNKNOWN
: options->uncompressed_size,
true);
} }