diff options
| author | Jiri Kosina <jkosina@suse.cz> | 2010-06-16 18:08:13 +0200 |
|---|---|---|
| committer | Jiri Kosina <jkosina@suse.cz> | 2010-06-16 18:08:13 +0200 |
| commit | f1bbbb6912662b9f6070c5bfc4ca9eb1f06a9d5b (patch) | |
| tree | c2c130a74be25b0b2dff992e1a195e2728bdaadd /lib/crc32.c | |
| parent | fd0961ff67727482bb20ca7e8ea97b83e9de2ddb (diff) | |
| parent | 7e27d6e778cd87b6f2415515d7127eba53fe5d02 (diff) | |
Merge branch 'master' into for-next
Diffstat (limited to 'lib/crc32.c')
| -rw-r--r-- | lib/crc32.c | 24 |
1 files changed, 15 insertions, 9 deletions
diff --git a/lib/crc32.c b/lib/crc32.c index bc5b936e914..4855995fcde 100644 --- a/lib/crc32.c +++ b/lib/crc32.c @@ -48,12 +48,20 @@ MODULE_LICENSE("GPL"); #if CRC_LE_BITS == 8 || CRC_BE_BITS == 8 static inline u32 -crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 *tab) +crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 (*tab)[256]) { # ifdef __LITTLE_ENDIAN -# define DO_CRC(x) crc = tab[(crc ^ (x)) & 255 ] ^ (crc >> 8) +# define DO_CRC(x) crc = tab[0][(crc ^ (x)) & 255] ^ (crc >> 8) +# define DO_CRC4 crc = tab[3][(crc) & 255] ^ \ + tab[2][(crc >> 8) & 255] ^ \ + tab[1][(crc >> 16) & 255] ^ \ + tab[0][(crc >> 24) & 255] # else -# define DO_CRC(x) crc = tab[((crc >> 24) ^ (x)) & 255] ^ (crc << 8) +# define DO_CRC(x) crc = tab[0][((crc >> 24) ^ (x)) & 255] ^ (crc << 8) +# define DO_CRC4 crc = tab[0][(crc) & 255] ^ \ + tab[1][(crc >> 8) & 255] ^ \ + tab[2][(crc >> 16) & 255] ^ \ + tab[3][(crc >> 24) & 255] # endif const u32 *b; size_t rem_len; @@ -70,10 +78,7 @@ crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 *tab) b = (const u32 *)buf; for (--b; len; --len) { crc ^= *++b; /* use pre increment for speed */ - DO_CRC(0); - DO_CRC(0); - DO_CRC(0); - DO_CRC(0); + DO_CRC4; } len = rem_len; /* And the last few bytes */ @@ -85,6 +90,7 @@ crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 *tab) } return crc; #undef DO_CRC +#undef DO_CRC4 } #endif /** @@ -117,7 +123,7 @@ u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len) u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len) { # if CRC_LE_BITS == 8 - const u32 *tab = crc32table_le; + const u32 (*tab)[] = crc32table_le; crc = __cpu_to_le32(crc); crc = crc32_body(crc, p, len, tab); @@ -174,7 +180,7 @@ u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len) u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len) { # if CRC_BE_BITS == 8 - const u32 *tab = crc32table_be; + const u32 (*tab)[] = crc32table_be; crc = __cpu_to_be32(crc); crc = crc32_body(crc, p, len, tab); |