Squashed 'third_party/rawrtc/re/' content from commit f3163ce8b
Change-Id: I6a235e6ac0f03269d951026f9d195da05c40fdab
git-subtree-dir: third_party/rawrtc/re
git-subtree-split: f3163ce8b526a13b35ef71ce4dd6f43585064d8a
diff --git a/src/hash/func.c b/src/hash/func.c
new file mode 100644
index 0000000..3943c94
--- /dev/null
+++ b/src/hash/func.c
@@ -0,0 +1,369 @@
+/**
+ * @file func.c Hashmap functions
+ *
+ * Copyright (C) 2010 Creytiv.com
+ */
+#include <ctype.h>
+#include <re_types.h>
+#include <re_fmt.h>
+#include <re_list.h>
+#include <re_hash.h>
+
+
+/**
+ * Calculate hash-value using "Jenkins One-at-a-time" hash algorithm.
+ *
+ * @param key Pointer to key
+ * @param len Key length
+ *
+ * @return Calculated hash-value
+ */
+uint32_t hash_joaat(const uint8_t *key, size_t len)
+{
+ uint32_t hash = 0;
+ size_t i;
+
+ for (i = 0; i < len; i++) {
+ hash += key[i];
+ hash += (hash << 10);
+ hash ^= (hash >> 6);
+ }
+ hash += (hash << 3);
+ hash ^= (hash >> 11);
+ hash += (hash << 15);
+
+ return hash;
+}
+
+
+/**
+ * Calculate hash-value for a case-insensitive string
+ *
+ * @param str String
+ * @param len Length of string
+ *
+ * @return Calculated hash-value
+ */
+uint32_t hash_joaat_ci(const char *str, size_t len)
+{
+ uint32_t hash = 0;
+ size_t i;
+
+ for (i = 0; i < len; i++) {
+ hash += tolower(str[i]);
+ hash += (hash << 10);
+ hash ^= (hash >> 6);
+ }
+ hash += (hash << 3);
+ hash ^= (hash >> 11);
+ hash += (hash << 15);
+
+ return hash;
+}
+
+
+/**
+ * Calculate hash-value for a NULL-terminated string
+ *
+ * @param str String
+ *
+ * @return Calculated hash-value
+ */
+uint32_t hash_joaat_str(const char *str)
+{
+ uint32_t hash = 0;
+
+ while (*str) {
+ hash += *str++;
+ hash += (hash << 10);
+ hash ^= (hash >> 6);
+ }
+ hash += (hash << 3);
+ hash ^= (hash >> 11);
+ hash += (hash << 15);
+
+ return hash;
+}
+
+
+/**
+ * Calculate hash-value for a case-insensitive NULL-terminated string
+ *
+ * @param str String
+ *
+ * @return Calculated hash-value
+ */
+uint32_t hash_joaat_str_ci(const char *str)
+{
+ uint32_t hash = 0;
+
+ while (*str) {
+ hash += tolower(*str++);
+ hash += (hash << 10);
+ hash ^= (hash >> 6);
+ }
+ hash += (hash << 3);
+ hash ^= (hash >> 11);
+ hash += (hash << 15);
+
+ return hash;
+}
+
+
+/**
+ * Calculate hash-value for a pointer-length object
+ *
+ * @param pl Pointer-length object
+ *
+ * @return Calculated hash-value
+ */
+uint32_t hash_joaat_pl(const struct pl *pl)
+{
+ return pl ? hash_joaat((const uint8_t *)pl->p, pl->l) : 0;
+}
+
+
+/**
+ * Calculate hash-value for a case-insensitive pointer-length object
+ *
+ * @param pl Pointer-length object
+ *
+ * @return Calculated hash-value
+ */
+uint32_t hash_joaat_pl_ci(const struct pl *pl)
+{
+ return pl ? hash_joaat_ci(pl->p, pl->l) : 0;
+}
+
+
+/*
+ * My best guess at if you are big-endian or little-endian. This may
+ * need adjustment.
+ */
+#if (defined(__BYTE_ORDER) && defined(__LITTLE_ENDIAN) && \
+ __BYTE_ORDER == __LITTLE_ENDIAN) || \
+ (defined(i386) || defined(__i386__) || defined(__i486__) || \
+ defined(__i586__) || defined(__i686__) || \
+ defined(vax) || defined(MIPSEL))
+# define HASH_LITTLE_ENDIAN 1
+# define HASH_BIG_ENDIAN 0
+#elif (defined(__BYTE_ORDER) && defined(__BIG_ENDIAN) && \
+ __BYTE_ORDER == __BIG_ENDIAN) || \
+ (defined(sparc) || defined(POWERPC) || \
+ defined(mc68000) || defined(sel))
+# define HASH_LITTLE_ENDIAN 0
+# define HASH_BIG_ENDIAN 1
+#else
+# define HASH_LITTLE_ENDIAN 0
+# define HASH_BIG_ENDIAN 0
+#endif
+
+#define hashsize(n) ((uint32_t)1<<(n))
+#define hashmask(n) (hashsize(n)-1)
+#define rot(x,k) (((x)<<(k)) | ((x)>>(32-(k))))
+
+#define mix(a,b,c) { \
+ a -= c; a ^= rot(c, 4); c += b; \
+ b -= a; b ^= rot(a, 6); a += c; \
+ c -= b; c ^= rot(b, 8); b += a; \
+ a -= c; a ^= rot(c,16); c += b; \
+ b -= a; b ^= rot(a,19); a += c; \
+ c -= b; c ^= rot(b, 4); b += a; \
+ }
+
+
+#define final(a,b,c) \
+ { \
+ c ^= b; c -= rot(b,14); \
+ a ^= c; a -= rot(c,11); \
+ b ^= a; b -= rot(a,25); \
+ c ^= b; c -= rot(b,16); \
+ a ^= c; a -= rot(c,4); \
+ b ^= a; b -= rot(a,14); \
+ c ^= b; c -= rot(b,24); \
+ }
+
+
+static uint32_t hashlittle( const void *key, size_t length, uint32_t initval)
+{
+ uint32_t a,b,c;
+ union { const void *ptr; size_t i; } u;
+
+ /* Set up the internal state */
+ a = b = c = 0xdeadbeef + ((uint32_t)length) + initval;
+
+ u.ptr = key;
+ if (HASH_LITTLE_ENDIAN && ((u.i & 0x3) == 0)) {
+ const uint32_t *k = (const uint32_t *)key;
+
+ while (length > 12) {
+ a += k[0];
+ b += k[1];
+ c += k[2];
+ mix(a,b,c);
+ length -= 12;
+ k += 3;
+ }
+
+#ifndef VALGRIND
+ switch (length) {
+
+ case 12: c+=k[2]; b+=k[1]; a+=k[0]; break;
+ case 11: c+=k[2]&0xffffff; b+=k[1]; a+=k[0]; break;
+ case 10: c+=k[2]&0xffff; b+=k[1]; a+=k[0]; break;
+ case 9 : c+=k[2]&0xff; b+=k[1]; a+=k[0]; break;
+ case 8 : b+=k[1]; a+=k[0]; break;
+ case 7 : b+=k[1]&0xffffff; a+=k[0]; break;
+ case 6 : b+=k[1]&0xffff; a+=k[0]; break;
+ case 5 : b+=k[1]&0xff; a+=k[0]; break;
+ case 4 : a+=k[0]; break;
+ case 3 : a+=k[0]&0xffffff; break;
+ case 2 : a+=k[0]&0xffff; break;
+ case 1 : a+=k[0]&0xff; break;
+ case 0 : return c;
+ }
+
+#else /* make valgrind happy */
+
+ const uint8_t *k8 = (const uint8_t *)k;
+ switch (length) {
+
+ case 12: c+=k[2]; b+=k[1]; a+=k[0]; break;
+ case 11: c+=((uint32_t)k8[10])<<16; /* fall through */
+ case 10: c+=((uint32_t)k8[9])<<8; /* fall through */
+ case 9 : c+=k8[8]; /* fall through */
+ case 8 : b+=k[1]; a+=k[0]; break;
+ case 7 : b+=((uint32_t)k8[6])<<16; /* fall through */
+ case 6 : b+=((uint32_t)k8[5])<<8; /* fall through */
+ case 5 : b+=k8[4]; /* fall through */
+ case 4 : a+=k[0]; break;
+ case 3 : a+=((uint32_t)k8[2])<<16; /* fall through */
+ case 2 : a+=((uint32_t)k8[1])<<8; /* fall through */
+ case 1 : a+=k8[0]; break;
+ case 0 : return c;
+ }
+
+#endif /* !valgrind */
+
+ }
+ else if (HASH_LITTLE_ENDIAN && ((u.i & 0x1) == 0)) {
+ const uint16_t *k = (const uint16_t *)key;
+ const uint8_t *k8;
+
+ while (length > 12) {
+ a += k[0] + (((uint32_t)k[1])<<16);
+ b += k[2] + (((uint32_t)k[3])<<16);
+ c += k[4] + (((uint32_t)k[5])<<16);
+ mix(a,b,c);
+ length -= 12;
+ k += 6;
+ }
+
+ k8 = (const uint8_t *)k;
+
+ switch (length) {
+
+ case 12: c+=k[4]+(((uint32_t)k[5])<<16);
+ b+=k[2]+(((uint32_t)k[3])<<16);
+ a+=k[0]+(((uint32_t)k[1])<<16);
+ break;
+ case 11: c+=((uint32_t)k8[10])<<16; /* fall through */
+ case 10: c+=k[4];
+ b+=k[2]+(((uint32_t)k[3])<<16);
+ a+=k[0]+(((uint32_t)k[1])<<16);
+ break;
+ case 9 : c+=k8[8]; /* fall through */
+ case 8 : b+=k[2]+(((uint32_t)k[3])<<16);
+ a+=k[0]+(((uint32_t)k[1])<<16);
+ break;
+ case 7 : b+=((uint32_t)k8[6])<<16; /* fall through */
+ case 6 : b+=k[2];
+ a+=k[0]+(((uint32_t)k[1])<<16);
+ break;
+ case 5 : b+=k8[4]; /* fall through */
+ case 4 : a+=k[0]+(((uint32_t)k[1])<<16);
+ break;
+ case 3 : a+=((uint32_t)k8[2])<<16; /* fall through */
+ case 2 : a+=k[0];
+ break;
+ case 1 : a+=k8[0];
+ break;
+ case 0 : return c;
+ }
+ }
+ else {
+ const uint8_t *k = (const uint8_t *)key;
+
+ while (length > 12) {
+ a += k[0];
+ a += ((uint32_t)k[1])<<8;
+ a += ((uint32_t)k[2])<<16;
+ a += ((uint32_t)k[3])<<24;
+ b += k[4];
+ b += ((uint32_t)k[5])<<8;
+ b += ((uint32_t)k[6])<<16;
+ b += ((uint32_t)k[7])<<24;
+ c += k[8];
+ c += ((uint32_t)k[9])<<8;
+ c += ((uint32_t)k[10])<<16;
+ c += ((uint32_t)k[11])<<24;
+ mix(a,b,c);
+ length -= 12;
+ k += 12;
+ }
+
+ /* all the case statements fall through */
+ switch (length) {
+
+ case 12: c+=((uint32_t)k[11])<<24;
+ case 11: c+=((uint32_t)k[10])<<16;
+ case 10: c+=((uint32_t)k[9])<<8;
+ case 9 : c+=k[8];
+ case 8 : b+=((uint32_t)k[7])<<24;
+ case 7 : b+=((uint32_t)k[6])<<16;
+ case 6 : b+=((uint32_t)k[5])<<8;
+ case 5 : b+=k[4];
+ case 4 : a+=((uint32_t)k[3])<<24;
+ case 3 : a+=((uint32_t)k[2])<<16;
+ case 2 : a+=((uint32_t)k[1])<<8;
+ case 1 : a+=k[0];
+ break;
+ case 0 : return c;
+ }
+ }
+
+ final(a,b,c);
+ return c;
+}
+
+
+/**
+ * Calculate hash-value using fast hash algorithm.
+ *
+ * @param k Pointer to key
+ * @param len Key length
+ *
+ * @return Calculated hash-value
+ */
+uint32_t hash_fast(const char *k, size_t len)
+{
+ static volatile int random_seed = 0x304a0012;
+
+ if (!k)
+ return 0;
+
+ return hashlittle(k, len, random_seed);
+}
+
+
+/**
+ * Calculate hash-value for a NULL-terminated string
+ *
+ * @param str String
+ *
+ * @return Calculated hash-value
+ */
+uint32_t hash_fast_str(const char *str)
+{
+ return hash_fast(str, str_len(str));
+}