mirror of https://git.tukaani.org/xz.git
liblzma: Use LZMA1EXT feature in lzma_alone_decoder().
This avoids the need to use the slightly ugly method to set the uncompressed size.
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@ -110,12 +110,24 @@ alone_decode(void *coder_ptr, const lzma_allocator *allocator,
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// Another hack to ditch false positives: Assume that
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// if the uncompressed size is known, it must be less
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// than 256 GiB.
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//
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// FIXME? Without picky we allow > LZMA_VLI_MAX which doesn't
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// really matter in this specific situation (> LZMA_VLI_MAX is
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// safe in the LZMA decoder) but it's somewhat weird still.
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if (coder->picky
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&& coder->uncompressed_size != LZMA_VLI_UNKNOWN
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&& coder->uncompressed_size
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>= (LZMA_VLI_C(1) << 38))
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return LZMA_FORMAT_ERROR;
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// Use LZMA_FILTER_LZMA1EXT features to specify the
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// uncompressed size and that the end marker is allowed
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// even when the uncompressed size is known. Both .lzma
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// header and LZMA1EXT use UINT64_MAX indicate that size
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// is unknown.
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coder->options.ext_flags = LZMA_LZMA1EXT_ALLOW_EOPM;
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lzma_set_ext_size(coder->options, coder->uncompressed_size);
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// Calculate the memory usage so that it is ready
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// for SEQ_CODER_INIT.
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coder->memusage = lzma_lzma_decoder_memusage(&coder->options)
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@ -132,7 +144,7 @@ alone_decode(void *coder_ptr, const lzma_allocator *allocator,
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lzma_filter_info filters[2] = {
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{
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.id = LZMA_FILTER_LZMA1,
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.id = LZMA_FILTER_LZMA1EXT,
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.init = &lzma_lzma_decoder_init,
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.options = &coder->options,
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}, {
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@ -143,10 +155,6 @@ alone_decode(void *coder_ptr, const lzma_allocator *allocator,
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return_if_error(lzma_next_filter_init(&coder->next,
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allocator, filters));
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// Use a hack to set the uncompressed size.
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lzma_lz_decoder_uncompressed(coder->next.coder,
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coder->uncompressed_size, true);
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coder->sequence = SEQ_CODE;
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break;
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}
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