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Commit 4f2a9463 authored by Joakim Tjernlund's avatar Joakim Tjernlund Committed by Linus Torvalds
Browse files

crc32: some minor cleanups 



Signed-off-by: default avatarJoakim Tjernlund <Joakim.Tjernlund@transmode.se>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent 5e79d96e

lib/crc32.c

+14 −16
Original line number Diff line number Diff line
@@ -31,9 +31,13 @@ 
#include "crc32defs.h"

#if CRC_LE_BITS == 8

# define tole(x) __constant_cpu_to_le32(x)

#define tobe(x) __constant_cpu_to_be32(x)

#else

# define tole(x) (x)

#endif



#if CRC_BE_BITS == 8

# define tobe(x) __constant_cpu_to_be32(x)

#else

# define tobe(x) (x)

#endif

#include "crc32table.h"
@@ -52,20 +56,19 @@ crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 *tab) 
# else

#  define DO_CRC(x) crc = tab[((crc >> 24) ^ (x)) & 255] ^ (crc << 8)

# endif

	const u32 *b = (const u32 *)buf;

	const u32 *b;

	size_t    rem_len;



	/* Align it */

	if (unlikely((long)b & 3 && len)) {

		u8 *p = (u8 *)b;

	if (unlikely((long)buf & 3 && len)) {

		do {

			DO_CRC(*p++);

		} while ((--len) && ((long)p)&3);

		b = (u32 *)p;

			DO_CRC(*buf++);

		} while ((--len) && ((long)buf)&3);

	}

	rem_len = len & 3;

	/* load data 32 bits wide, xor data 32 bits wide. */

	len = len >> 2;

	b = (const u32 *)buf;

	for (--b; len; --len) {

		crc ^= *++b; /* use pre increment for speed */

		DO_CRC(0);
@@ -82,6 +85,7 @@ crc32_body(u32 crc, unsigned char const *buf, size_t len, const u32 *tab) 
		} while (--len);

	}

	return crc;

#undef DO_CRC

}

#endif

/**
@@ -119,9 +123,6 @@ u32 __pure crc32_le(u32 crc, unsigned char const *p, size_t len) 
	crc = __cpu_to_le32(crc);

	crc = crc32_body(crc, p, len, tab);

	return __le32_to_cpu(crc);

#undef ENDIAN_SHIFT

#undef DO_CRC



# elif CRC_LE_BITS == 4

	while (len--) {

		crc ^= *p++;
@@ -179,9 +180,6 @@ u32 __pure crc32_be(u32 crc, unsigned char const *p, size_t len) 
	crc = __cpu_to_be32(crc);

	crc = crc32_body(crc, p, len, tab);

	return __be32_to_cpu(crc);

#undef ENDIAN_SHIFT

#undef DO_CRC



# elif CRC_BE_BITS == 4

	while (len--) {

		crc ^= *p++ << 24;