Revert "LU-1201 checksum: add libcfs crypto hash"

[fs/lustre-release.git] / libcfs / libcfs / posix / posix-crc32.c

diff --git a/libcfs/libcfs/posix/posix-crc32.c b/libcfs/libcfs/posix/posix-crc32.c
deleted file mode 100644 (file)
index 972c5ff..0000000
--- a/libcfs/libcfs/posix/posix-crc32.c
+++ /dev/null
@@ -1,78 +0,0 @@
-/*
- *      This file contains part of linux kernel implementation of crc32
- *      kernel version 2.6.32
- */
-#include <libcfs/libcfs.h>
-#define CRCPOLY_LE      0xedb88320
-#define CRC_LE_BITS     8
-#define LE_TABLE_SIZE   (1 << CRC_LE_BITS)
-
-static unsigned int crc32table_le[LE_TABLE_SIZE];
-/**
- * crc32init_le() - allocate and initialize LE table data
- *
- * crc is the crc of the byte i; other entries are filled in based on the
- * fact that crctable[i^j] = crctable[i] ^ crctable[j].
- *
- */
-void crc32init_le(void)
-{
-       unsigned i, j;
-       unsigned int crc = 1;
-
-       crc32table_le[0] = 0;
-
-       for (i = 1 << (CRC_LE_BITS - 1); i; i >>= 1) {
-               crc = (crc >> 1) ^ ((crc & 1) ? CRCPOLY_LE : 0);
-               for (j = 0; j < LE_TABLE_SIZE; j += 2 * i)
-                       crc32table_le[i + j] = crc ^ crc32table_le[j];
-       }
-}
-
-unsigned int crc32_le(unsigned int crc, unsigned char const *p, size_t len)
-{
-       const unsigned int      *b = (unsigned int *)p;
-       const unsigned int      *tab = crc32table_le;
-
-# ifdef __LITTLE_ENDIAN
-#  define DO_CRC(x) crc = tab[(crc ^ (x)) & 255] ^ (crc>>8)
-# else
-#  define DO_CRC(x) crc = tab[((crc >> 24) ^ (x)) & 255] ^ (crc<<8)
-# endif
-
-       crc = cpu_to_le32(crc);
-       /* Align it */
-       if (unlikely(((long)b) & 3 && len)) {
-               do {
-                       unsigned char *p = (unsigned char *)b;
-                       DO_CRC(*p++);
-                       b = (void *)p;
-               } while ((--len) && ((long)b) & 3);
-       }
-       if (likely(len >= 4)) {
-               /* load data 32 bits wide, xor data 32 bits wide. */
-               size_t save_len = len & 3;
-               len = len >> 2;
-               --b; /* use pre increment below(*++b) for speed */
-               do {
-                       crc ^= *++b;
-                       DO_CRC(0);
-                       DO_CRC(0);
-                       DO_CRC(0);
-                       DO_CRC(0);
-               } while (--len);
-               b++; /* point to next byte(s) */
-               len = save_len;
-       }
-       /* And the last few bytes */
-       if (len) {
-               do {
-                       unsigned char *p = (unsigned char *)b;
-                       DO_CRC(*p++);
-                       b = (void *)p;
-               } while (--len);
-       }
-
-       return le32_to_cpu(crc);
-#undef DO_CRC
-}