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-rw-r--r--libbb/read.c53
1 files changed, 36 insertions, 17 deletions
diff --git a/libbb/read.c b/libbb/read.c
index f3af144f0..cd6bbeb13 100644
--- a/libbb/read.c
+++ b/libbb/read.c
@@ -305,22 +305,26 @@ void* FAST_FUNC xmalloc_xopen_read_close(const char *filename, size_t *maxsz_p)
return buf;
}
+/* Used by e.g. rpm which gives us a fd without filename,
+ * thus we can't guess the format from filename's extension.
+ */
#if ZIPPED
-int FAST_FUNC setup_unzip_on_fd(int fd /*, int fail_if_not_detected*/)
+void FAST_FUNC setup_unzip_on_fd(int fd /*, int fail_if_not_detected*/)
{
const int fail_if_not_detected = 1;
- unsigned char magic[2];
-#if BB_MMU
+ unsigned char magic[8];
+ int offset = -2;
+# if BB_MMU
IF_DESKTOP(long long) int FAST_FUNC (*xformer)(int src_fd, int dst_fd);
enum { xformer_prog = 0 };
-#else
+# else
enum { xformer = 0 };
const char *xformer_prog;
-#endif
+# endif
/* .gz and .bz2 both have 2-byte signature, and their
* unpack_XXX_stream wants this header skipped. */
- xread(fd, &magic, 2);
+ xread(fd, magic, 2);
if (ENABLE_FEATURE_SEAMLESS_GZ
&& magic[0] == 0x1f && magic[1] == 0x8b
) {
@@ -341,28 +345,41 @@ int FAST_FUNC setup_unzip_on_fd(int fd /*, int fail_if_not_detected*/)
# endif
goto found_magic;
}
-// TODO: xz format support. rpm adopted it, "rpm -i FILE.rpm" badly needs this.
-// Signature: 0xFD, '7', 'z', 'X', 'Z', 0x00
-// More info at: http://tukaani.org/xz/xz-file-format.txt
+ if (ENABLE_FEATURE_SEAMLESS_XZ
+ && magic[0] == 0xfd && magic[1] == '7'
+ ) {
+ /* .xz signature: 0xfd, '7', 'z', 'X', 'Z', 0x00 */
+ /* More info at: http://tukaani.org/xz/xz-file-format.txt */
+ offset = -6;
+ xread(fd, magic + 2, 4);
+ if (strcmp((char*)magic + 2, "zXZ") == 0) {
+# if BB_MMU
+ xformer = unpack_xz_stream;
+# else
+ xformer_prog = "unxz";
+# endif
+ xlseek(fd, offset, SEEK_CUR);
+ goto found_magic;
+ }
+ }
/* No known magic seen */
if (fail_if_not_detected)
bb_error_msg_and_die("no gzip"
IF_FEATURE_SEAMLESS_BZ2("/bzip2")
+ IF_FEATURE_SEAMLESS_XZ("/xz")
" magic");
- xlseek(fd, -2, SEEK_CUR);
- return fd;
+ xlseek(fd, offset, SEEK_CUR);
+ return;
found_magic:
# if !BB_MMU
/* NOMMU version of open_transformer execs
* an external unzipper that wants
* file position at the start of the file */
- xlseek(fd, -2, SEEK_CUR);
+ xlseek(fd, offset, SEEK_CUR);
# endif
open_transformer(fd, xformer, xformer_prog);
-
- return fd;
}
#endif /* ZIPPED */
@@ -380,12 +397,14 @@ int FAST_FUNC open_zipped(const char *fname)
sfx = strrchr(fname, '.');
if (sfx) {
- if (ENABLE_FEATURE_SEAMLESS_LZMA && strcmp(sfx, ".lzma") == 0)
+ sfx++;
+ if (ENABLE_FEATURE_SEAMLESS_LZMA && strcmp(sfx, "lzma") == 0)
/* .lzma has no header/signature, just trust it */
open_transformer(fd, unpack_lzma_stream, "unlzma");
else
- if ((ENABLE_FEATURE_SEAMLESS_GZ && strcmp(sfx, ".gz") == 0)
- || (ENABLE_FEATURE_SEAMLESS_BZ2 && strcmp(sfx, ".bz2") == 0)
+ if ((ENABLE_FEATURE_SEAMLESS_GZ && strcmp(sfx, "gz") == 0)
+ || (ENABLE_FEATURE_SEAMLESS_BZ2 && strcmp(sfx, "bz2") == 0)
+ || (ENABLE_FEATURE_SEAMLESS_XZ && strcmp(sfx, "xz") == 0)
) {
setup_unzip_on_fd(fd /*, fail_if_not_detected: 1*/);
}