diff options
Diffstat (limited to 'libbb')
| -rw-r--r-- | libbb/read.c | 53 |
1 files changed, 36 insertions, 17 deletions
diff --git a/libbb/read.c b/libbb/read.c index f3af144..cd6bbeb 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*/); } |