5 * Copyright (C) 2002 by Theodore Ts'o
7 * This file is released under the GPL v2.
9 * This file may be redistributed under the terms of the GNU Public
13 #include <linux/types.h>
14 #define DELTA 0x9E3779B9
16 static void TEA_transform(__u32 buf[2], __u32 const in[])
19 __u32 b0 = buf[0], b1 = buf[1];
20 __u32 a = in[0], b = in[1], c = in[2], d = in[3];
25 b0 += ((b1 << 4)+a) ^ (b1+sum) ^ ((b1 >> 5)+b);
26 b1 += ((b0 << 4)+c) ^ (b0+sum) ^ ((b0 >> 5)+d);
33 static void str2hashbuf(const char *msg, int len, __u32 *buf, int num)
38 pad = (__u32)len | ((__u32)len << 8);
44 for (i=0; i < len; i++) {
47 val = msg[i] + (val << 8);
60 int btrfs_name_hash(const char *name, int len, u64 *hash_result)
67 if (len == 1 && *name == '.') {
70 } else if (len == 2 && name[0] == '.' && name[1] == '.') {
75 /* Initialize the default seed for the hash checksum functions */
83 str2hashbuf(p, len, in, 4);
84 TEA_transform(buf, in);
90 *hash_result = buf[0];
92 *hash_result |= buf[1];