mirror of https://git.tukaani.org/xz.git
liblzma: Add .lz support to lzma_auto_decoder().
Thanks to Michał Górny for the original patch.
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@ -700,11 +700,13 @@ extern LZMA_API(lzma_ret) lzma_stream_decoder_mt(
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/**
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* \brief Decode .xz Streams and .lzma files with autodetection
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* \brief Decode .xz, .lzma, and .lz (lzip) files with autodetection
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*
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* This decoder autodetects between the .xz and .lzma file formats, and
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* calls lzma_stream_decoder() or lzma_alone_decoder() once the type
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* of the input file has been detected.
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* This decoder autodetects between the .xz, .lzma, and .lz file formats,
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* and calls lzma_stream_decoder(), lzma_alone_decoder(), or
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* lzma_lzip_decoder() once the type of the input file has been detected.
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*
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* Support for .lz was added in 5.4.0.
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*
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* If the flag LZMA_CONCATENATED is used and the input is a .lzma file:
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* For historical reasons concatenated .lzma files aren't supported.
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@ -97,6 +97,7 @@ endif
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if COND_LZIP_DECODER
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liblzma_la_SOURCES += \
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common/lzip_decoder.c
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common/lzip_decoder.c \
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common/lzip_decoder.h
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endif
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endif
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@ -1,7 +1,7 @@
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///////////////////////////////////////////////////////////////////////////////
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//
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/// \file auto_decoder.c
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/// \brief Autodetect between .xz Stream and .lzma (LZMA_Alone) formats
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/// \brief Autodetect between .xz, .lzma (LZMA_Alone), and .lz (lzip)
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//
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// Author: Lasse Collin
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//
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@ -12,10 +12,13 @@
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#include "stream_decoder.h"
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#include "alone_decoder.h"
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#ifdef HAVE_LZIP_DECODER
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# include "lzip_decoder.h"
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#endif
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typedef struct {
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/// Stream decoder or LZMA_Alone decoder
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/// .xz Stream decoder, LZMA_Alone decoder, or lzip decoder
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lzma_next_coder next;
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uint64_t memlimit;
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@ -46,14 +49,22 @@ auto_decode(void *coder_ptr, const lzma_allocator *allocator,
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// SEQ_CODE even if we return some LZMA_*_CHECK.
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coder->sequence = SEQ_CODE;
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// Detect the file format. For now this is simple, since if
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// it doesn't start with 0xFD (the first magic byte of the
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// new format), it has to be LZMA_Alone, or something that
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// we don't support at all.
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// Detect the file format. .xz files start with 0xFD which
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// cannot be the first byte of .lzma (LZMA_Alone) format.
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// The .lz format starts with 0x4C which could be the
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// first byte of a .lzma file but luckily it would mean
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// lc/lp/pb being 4/3/1 which liblzma doesn't support because
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// lc + lp > 4. So using just 0x4C to detect .lz is OK here.
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if (in[*in_pos] == 0xFD) {
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return_if_error(lzma_stream_decoder_init(
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&coder->next, allocator,
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coder->memlimit, coder->flags));
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#ifdef HAVE_LZIP_DECODER
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} else if (in[*in_pos] == 0x4C) {
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return_if_error(lzma_lzip_decoder_init(
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&coder->next, allocator,
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coder->memlimit, coder->flags));
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#endif
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} else {
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return_if_error(lzma_alone_decoder_init(&coder->next,
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allocator, coder->memlimit, true));
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@ -0,0 +1,22 @@
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///////////////////////////////////////////////////////////////////////////////
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//
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/// \file lzip_decoder.h
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/// \brief Decodes .lz (lzip) files
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//
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// Author: Michał Górny
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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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#ifndef LZMA_LZIP_DECODER_H
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#define LZMA_LZIP_DECODER_H
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#include "common.h"
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extern lzma_ret lzma_lzip_decoder_init(
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lzma_next_coder *next, const lzma_allocator *allocator,
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uint64_t memlimit, uint32_t flags);
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#endif
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