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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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13
util-linux/fdisk_gpt.c
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@ -46,8 +46,6 @@ static unsigned int n_parts;
static unsigned int part_array_len;
static unsigned int part_entry_len;
static uint32_t *crc32_table;
static inline gpt_partition *
gpt_part(int i)
{
@ -61,12 +59,7 @@ gpt_part(int i)
static uint32_t
gpt_crc32(void *buf, int len)
{
uint32_t crc = 0xffffffff;
for (; len > 0; len--, buf++) {
crc = crc32_table[(crc ^ *((char *)buf)) & 0xff] ^ (crc >> 8);
}
return crc ^ 0xffffffff;
return 0xffffffff ^ crc32_block_endian0(0xffffffff, buf, len, global_crc32_table);
}
static void
@ -160,8 +153,8 @@ check_gpt_label(void)
return 0;
}
if (!crc32_table) {
crc32_table = crc32_filltable(NULL, 0);
if (!global_crc32_table) {
global_crc32_table = crc32_filltable(NULL, 0);
}
crc = SWAP_LE32(gpt_hdr->hdr_crc32);