summaryrefslogtreecommitdiff
path: root/archival/gzip.c
diff options
context:
space:
mode:
authorDenys Vlasenko2010-10-27 15:26:45 +0200
committerDenys Vlasenko2010-10-27 15:26:45 +0200
commit9ce642f9746dfc29d119d0680b769677e3ea6da6 (patch)
treef8d2bcd08c691979058b610b32573a742a3e3024 /archival/gzip.c
parentdd88ba88f5082b1785539b1fb87af7320515b8c9 (diff)
downloadbusybox-9ce642f9746dfc29d119d0680b769677e3ea6da6.zip
busybox-9ce642f9746dfc29d119d0680b769677e3ea6da6.tar.gz
libbb: introduce and use common crc32 routine
function old new delta crc32_block_endian1 - 37 +37 crc32_block_endian0 - 34 +34 global_crc32_table - 8 +8 file_read 82 87 +5 gzip_main 211 214 +3 xz_crc32 40 35 -5 crc32_table 8 - -8 calculate_gunzip_crc 54 34 -20 lzo_crc32 54 25 -29 cksum_main 298 211 -87 ------------------------------------------------------------------------------ (add/remove: 3/1 grow/shrink: 2/4 up/down: 87/-149) Total: -62 bytes Signed-off-by: Denys Vlasenko <dvlasenk@redhat.com>
Diffstat (limited to 'archival/gzip.c')
-rw-r--r--archival/gzip.c16
1 files changed, 5 insertions, 11 deletions
diff --git a/archival/gzip.c b/archival/gzip.c
index 32528d9..4d39906 100644
--- a/archival/gzip.c
+++ b/archival/gzip.c
@@ -340,7 +340,7 @@ struct globals {
ulg bits_sent; /* bit length of the compressed data */
#endif
- uint32_t *crc_32_tab;
+ /*uint32_t *crc_32_tab;*/
uint32_t crc; /* shift register contents */
};
@@ -393,15 +393,9 @@ static void put_32bit(ulg n)
* pointer, then initialize the crc shift register contents instead.
* Return the current crc in either case.
*/
-static uint32_t updcrc(uch * s, unsigned n)
+static void updcrc(uch * s, unsigned n)
{
- uint32_t c = G1.crc;
- while (n) {
- c = G1.crc_32_tab[(uch)(c ^ *s++)] ^ (c >> 8);
- n--;
- }
- G1.crc = c;
- return c;
+ G1.crc = crc32_block_endian0(G1.crc, s, n, global_crc32_table /*G1.crc_32_tab*/);
}
@@ -2104,8 +2098,8 @@ int gzip_main(int argc UNUSED_PARAM, char **argv)
ALLOC(uch, G1.window, 2L * WSIZE);
ALLOC(ush, G1.prev, 1L << BITS);
- /* Initialise the CRC32 table */
- G1.crc_32_tab = crc32_filltable(NULL, 0);
+ /* Initialize the CRC32 table */
+ global_crc32_table = crc32_filltable(NULL, 0);
return bbunpack(argv, pack_gzip, append_ext, "gz");
}