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liblzma: Use LZMA1EXT feature in lzma_alone_decoder(). 

This avoids the need to use the slightly ugly method to
set the uncompressed size.
This commit is contained in:
Lasse Collin 2022-11-28 10:28:20 +02:00
parent 33b8a24b66
commit e310e8b6a4
1 changed files with 13 additions and 5 deletions
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18
src/liblzma/common/alone_decoder.c
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@ -110,12 +110,24 @@ alone_decode(void *coder_ptr, const lzma_allocator *allocator,
// Another hack to ditch false positives: Assume that
// if the uncompressed size is known, it must be less
// than 256 GiB.
//
// FIXME? Without picky we allow > LZMA_VLI_MAX which doesn't
// really matter in this specific situation (> LZMA_VLI_MAX is
// safe in the LZMA decoder) but it's somewhat weird still.
if (coder->picky
&& coder->uncompressed_size != LZMA_VLI_UNKNOWN
&& coder->uncompressed_size
>= (LZMA_VLI_C(1) << 38))
return LZMA_FORMAT_ERROR;
// Use LZMA_FILTER_LZMA1EXT features to specify the
// uncompressed size and that the end marker is allowed
// even when the uncompressed size is known. Both .lzma
// header and LZMA1EXT use UINT64_MAX indicate that size
// is unknown.
coder->options.ext_flags = LZMA_LZMA1EXT_ALLOW_EOPM;
lzma_set_ext_size(coder->options, coder->uncompressed_size);
// Calculate the memory usage so that it is ready
// for SEQ_CODER_INIT.
coder->memusage = lzma_lzma_decoder_memusage(&coder->options)
@ -132,7 +144,7 @@ alone_decode(void *coder_ptr, const lzma_allocator *allocator,
lzma_filter_info filters[2] = {
{
.id = LZMA_FILTER_LZMA1,
.id = LZMA_FILTER_LZMA1EXT,
.init = &lzma_lzma_decoder_init,
.options = &coder->options,
}, {
@ -143,10 +155,6 @@ alone_decode(void *coder_ptr, const lzma_allocator *allocator,
return_if_error(lzma_next_filter_init(&coder->next,
allocator, filters));
// Use a hack to set the uncompressed size.
lzma_lz_decoder_uncompressed(coder->next.coder,
coder->uncompressed_size, true);
coder->sequence = SEQ_CODE;
break;
}