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libbb: introduce and use common crc32 routine

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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>
This commit is contained in:
Denys Vlasenko
2010-10-27 15:26:45 +02:00
parent dd88ba88f5
commit 9ce642f974
9 changed files with 49 additions and 73 deletions
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7
coreutils/cksum.c
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@ -18,7 +18,6 @@ int cksum_main(int argc UNUSED_PARAM, char **argv)
off_t length, filesize;
int bytes_read;
int exit_code = EXIT_SUCCESS;
uint8_t *cp;
#if ENABLE_DESKTOP
getopt32(argv, ""); /* coreutils 6.9 compat */
@ -39,11 +38,7 @@ int cksum_main(int argc UNUSED_PARAM, char **argv)
#define read_buf bb_common_bufsiz1
while ((bytes_read = safe_read(fd, read_buf, sizeof(read_buf))) > 0) {
cp = (uint8_t *) read_buf;
length += bytes_read;
do {
crc = (crc << 8) ^ crc32_table[(crc >> 24) ^ *cp++];
} while (--bytes_read);
crc = crc32_block_endian1(crc, read_buf, bytes_read, crc32_table);
}
close(fd);