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authorLasse Collin <lasse.collin@tukaani.org>2022-10-08 00:29:20 +0300
committerLasse Collin <lasse.collin@tukaani.org>2022-11-09 14:25:26 +0200
commit034086e1ae1459210837a24e04878435c86dc41b (patch)
tree550b52e3a8da37a761cd09d57b1b3eeff44ed9c9 /src/liblzma
parentliblzma: Add .lz (lzip) decompression support (format versions 0 and 1). (diff)
downloadxz-034086e1ae1459210837a24e04878435c86dc41b.tar.xz
liblzma: Add .lz support to lzma_auto_decoder().
Thanks to Michał Górny for the original patch.
Diffstat (limited to '')
-rw-r--r--src/liblzma/api/lzma/container.h10
-rw-r--r--src/liblzma/common/Makefile.inc3
-rw-r--r--src/liblzma/common/auto_decoder.c23
-rw-r--r--src/liblzma/common/lzip_decoder.h22
4 files changed, 47 insertions, 11 deletions
diff --git a/src/liblzma/api/lzma/container.h b/src/liblzma/api/lzma/container.h
index 6a2f4d78..6e432a1f 100644
--- a/src/liblzma/api/lzma/container.h
+++ b/src/liblzma/api/lzma/container.h
@@ -700,11 +700,13 @@ extern LZMA_API(lzma_ret) lzma_stream_decoder_mt(
/**
- * \brief Decode .xz Streams and .lzma files with autodetection
+ * \brief Decode .xz, .lzma, and .lz (lzip) files with autodetection
*
- * This decoder autodetects between the .xz and .lzma file formats, and
- * calls lzma_stream_decoder() or lzma_alone_decoder() once the type
- * of the input file has been detected.
+ * This decoder autodetects between the .xz, .lzma, and .lz file formats,
+ * and calls lzma_stream_decoder(), lzma_alone_decoder(), or
+ * lzma_lzip_decoder() once the type of the input file has been detected.
+ *
+ * Support for .lz was added in 5.4.0.
*
* If the flag LZMA_CONCATENATED is used and the input is a .lzma file:
* For historical reasons concatenated .lzma files aren't supported.
diff --git a/src/liblzma/common/Makefile.inc b/src/liblzma/common/Makefile.inc
index f821571a..44ab32f3 100644
--- a/src/liblzma/common/Makefile.inc
+++ b/src/liblzma/common/Makefile.inc
@@ -97,6 +97,7 @@ endif
if COND_LZIP_DECODER
liblzma_la_SOURCES += \
- common/lzip_decoder.c
+ common/lzip_decoder.c \
+ common/lzip_decoder.h
endif
endif
diff --git a/src/liblzma/common/auto_decoder.c b/src/liblzma/common/auto_decoder.c
index f58ab595..2a5c0894 100644
--- a/src/liblzma/common/auto_decoder.c
+++ b/src/liblzma/common/auto_decoder.c
@@ -1,7 +1,7 @@
///////////////////////////////////////////////////////////////////////////////
//
/// \file auto_decoder.c
-/// \brief Autodetect between .xz Stream and .lzma (LZMA_Alone) formats
+/// \brief Autodetect between .xz, .lzma (LZMA_Alone), and .lz (lzip)
//
// Author: Lasse Collin
//
@@ -12,10 +12,13 @@
#include "stream_decoder.h"
#include "alone_decoder.h"
+#ifdef HAVE_LZIP_DECODER
+# include "lzip_decoder.h"
+#endif
typedef struct {
- /// Stream decoder or LZMA_Alone decoder
+ /// .xz Stream decoder, LZMA_Alone decoder, or lzip decoder
lzma_next_coder next;
uint64_t memlimit;
@@ -46,14 +49,22 @@ auto_decode(void *coder_ptr, const lzma_allocator *allocator,
// SEQ_CODE even if we return some LZMA_*_CHECK.
coder->sequence = SEQ_CODE;
- // Detect the file format. For now this is simple, since if
- // it doesn't start with 0xFD (the first magic byte of the
- // new format), it has to be LZMA_Alone, or something that
- // we don't support at all.
+ // Detect the file format. .xz files start with 0xFD which
+ // cannot be the first byte of .lzma (LZMA_Alone) format.
+ // The .lz format starts with 0x4C which could be the
+ // first byte of a .lzma file but luckily it would mean
+ // lc/lp/pb being 4/3/1 which liblzma doesn't support because
+ // lc + lp > 4. So using just 0x4C to detect .lz is OK here.
if (in[*in_pos] == 0xFD) {
return_if_error(lzma_stream_decoder_init(
&coder->next, allocator,
coder->memlimit, coder->flags));
+#ifdef HAVE_LZIP_DECODER
+ } else if (in[*in_pos] == 0x4C) {
+ return_if_error(lzma_lzip_decoder_init(
+ &coder->next, allocator,
+ coder->memlimit, coder->flags));
+#endif
} else {
return_if_error(lzma_alone_decoder_init(&coder->next,
allocator, coder->memlimit, true));
diff --git a/src/liblzma/common/lzip_decoder.h b/src/liblzma/common/lzip_decoder.h
new file mode 100644
index 00000000..33a01c35
--- /dev/null
+++ b/src/liblzma/common/lzip_decoder.h
@@ -0,0 +1,22 @@
+///////////////////////////////////////////////////////////////////////////////
+//
+/// \file lzip_decoder.h
+/// \brief Decodes .lz (lzip) files
+//
+// Author: Michał Górny
+//
+// This file has been put into the public domain.
+// You can do whatever you want with this file.
+//
+///////////////////////////////////////////////////////////////////////////////
+
+#ifndef LZMA_LZIP_DECODER_H
+#define LZMA_LZIP_DECODER_H
+
+#include "common.h"
+
+extern lzma_ret lzma_lzip_decoder_init(
+ lzma_next_coder *next, const lzma_allocator *allocator,
+ uint64_t memlimit, uint32_t flags);
+
+#endif