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| author | Denys Vlasenko | 2010-06-30 19:43:44 +0200 |
|---|---|---|
| committer | Denys Vlasenko | 2010-06-30 19:43:44 +0200 |
| commit | 620e863ba24fe9e0126d1540e89a531264021a77 (patch) | |
| tree | c761483f73c045f510690c64a89d6ca56b511a7f /archival/libunarchive | |
| parent | fa5ea17b5f6457d888a30afeff87420b7fe0348a (diff) | |
| download | busybox-620e863ba24fe9e0126d1540e89a531264021a77.zip busybox-620e863ba24fe9e0126d1540e89a531264021a77.tar.gz | |
bzip2 decompression: simple code shrink
function old new delta
unpack_bz2_stream_prime 60 55 -5
get_header_tar 1508 1496 -12
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'archival/libunarchive')
| -rw-r--r-- | archival/libunarchive/decompress_bunzip2.c | 6 | ||||
| -rw-r--r-- | archival/libunarchive/get_header_tar.c | 9 |
2 files changed, 9 insertions, 6 deletions
diff --git a/archival/libunarchive/decompress_bunzip2.c b/archival/libunarchive/decompress_bunzip2.c index cd8df08..bdbd39a 100644 --- a/archival/libunarchive/decompress_bunzip2.c +++ b/archival/libunarchive/decompress_bunzip2.c @@ -692,9 +692,9 @@ unpack_bz2_stream(int src_fd, int dst_fd) IF_DESKTOP(long long) int FAST_FUNC unpack_bz2_stream_prime(int src_fd, int dst_fd) { - unsigned char magic[2]; - xread(src_fd, magic, 2); - if (magic[0] != 'B' || magic[1] != 'Z') { + uint16_t magic2; + xread(src_fd, &magic2, 2); + if (magic2 != BZIP2_MAGIC) { bb_error_msg_and_die("invalid magic"); } return unpack_bz2_stream(src_fd, dst_fd); diff --git a/archival/libunarchive/get_header_tar.c b/archival/libunarchive/get_header_tar.c index 21bbc97..d5c9235 100644 --- a/archival/libunarchive/get_header_tar.c +++ b/archival/libunarchive/get_header_tar.c @@ -196,27 +196,30 @@ char FAST_FUNC get_header_tar(archive_handle_t *archive_handle) ) { #if ENABLE_FEATURE_TAR_AUTODETECT char FAST_FUNC (*get_header_ptr)(archive_handle_t *); + uint16_t magic2; autodetect: + magic2 = *(uint16_t*)tar.name; /* tar gz/bz autodetect: check for gz/bz2 magic. * If we see the magic, and it is the very first block, * we can switch to get_header_tar_gz/bz2/lzma(). * Needs seekable fd. I wish recv(MSG_PEEK) works * on any fd... */ # if ENABLE_FEATURE_SEAMLESS_GZ - if (tar.name[0] == 0x1f && tar.name[1] == (char)0x8b) { /* gzip */ + if (magic2 == GZIP_MAGIC) { get_header_ptr = get_header_tar_gz; } else # endif # if ENABLE_FEATURE_SEAMLESS_BZ2 - if (tar.name[0] == 'B' && tar.name[1] == 'Z' + if (magic2 == BZIP2_MAGIC && tar.name[2] == 'h' && isdigit(tar.name[3]) ) { /* bzip2 */ get_header_ptr = get_header_tar_bz2; } else # endif # if ENABLE_FEATURE_SEAMLESS_XZ - //TODO + //TODO: if (magic2 == XZ_MAGIC1)... + //else # endif goto err; /* Two different causes for lseek() != 0: |