Adding upstream version 0.11.1.upstream/0.11.1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 339 insertions, 0 deletions

diff --git a/src/spookyhash/SpookyV2.h b/src/spookyhash/SpookyV2.h
new file mode 100644
index 0000000..e096e7c
--- /dev/null
+++ b/src/spookyhash/SpookyV2.h
@@ -0,0 +1,339 @@
+//
+// SpookyHash: a 128-bit noncryptographic hash function
+// By Bob Jenkins, public domain
+//   Oct 31 2010: alpha, framework + SpookyHash::Mix appears right
+//   Oct 31 2011: alpha again, Mix only good to 2^^69 but rest appears right
+//   Dec 31 2011: beta, improved Mix, tested it for 2-bit deltas
+//   Feb  2 2012: production, same bits as beta
+//   Feb  5 2012: adjusted definitions of uint* to be more portable
+//   Mar 30 2012: 3 bytes/cycle, not 4.  Alpha was 4 but wasn't thorough enough.
+//   August 5 2012: SpookyV2 (different results)
+// 
+// Up to 3 bytes/cycle for long messages.  Reasonably fast for short messages.
+// All 1 or 2 bit deltas achieve avalanche within 1% bias per output bit.
+//
+// This was developed for and tested on 64-bit x86-compatible processors.
+// It assumes the processor is little-endian.  There is a macro
+// controlling whether unaligned reads are allowed (by default they are).
+// This should be an equally good hash on big-endian machines, but it will
+// compute different results on them than on little-endian machines.
+//
+// Google's CityHash has similar specs to SpookyHash, and CityHash is faster
+// on new Intel boxes.  MD4 and MD5 also have similar specs, but they are orders
+// of magnitude slower.  CRCs are two or more times slower, but unlike 
+// SpookyHash, they have nice math for combining the CRCs of pieces to form 
+// the CRCs of wholes.  There are also cryptographic hashes, but those are even 
+// slower than MD5.
+//
+
+#ifndef _SPOOKYHASH_V2_H
+#define _SPOOKYHASH_V2_H
+#include <stddef.h>
+
+#ifdef _MSC_VER
+# define INLINE __forceinline
+  typedef  unsigned __int64 uint64;
+  typedef  unsigned __int32 uint32;
+  typedef  unsigned __int16 uint16;
+  typedef  unsigned __int8  uint8;
+#else
+# include <stdint.h>
+# define INLINE inline
+  typedef  uint64_t  uint64;
+  typedef  uint32_t  uint32;
+  typedef  uint16_t  uint16;
+  typedef  uint8_t   uint8;
+#endif
+
+#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
+#define SPOOKYHASH_LITTLE_ENDIAN_64(b)   ((uint64_t)b)
+#define SPOOKYHASH_LITTLE_ENDIAN_32(b)   ((uint32_t)b)
+#define SPOOKYHASH_LITTLE_ENDIAN_16(b)   ((uint16_t)b)
+#elif __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
+#if __GNUC__ * 100 + __GNUC_MINOR__ >= 403 || defined(__clang__)
+#define SPOOKYHASH_LITTLE_ENDIAN_64(b)   __builtin_bswap64(b)
+#define SPOOKYHASH_LITTLE_ENDIAN_32(b)   __builtin_bswap32(b)
+#define SPOOKYHASH_LITTLE_ENDIAN_16(b)   __builtin_bswap16(b)
+#else
+#warning Using bulk byte swap routines. Expect performance issues.
+#define SPOOKYHASH_LITTLE_ENDIAN_64(b)   ((((b) & 0xFF00000000000000ull) >> 56) | (((b) & 0x00FF000000000000ull) >> 40) | (((b) & 0x0000FF0000000000ull) >> 24) | (((b) & 0x000000FF00000000ull) >> 8) | (((b) & 0x00000000FF000000ull) << 8) | (((b) & 0x0000000000FF0000ull) << 24ull) | (((b) & 0x000000000000FF00ull) << 40) | (((b) & 0x00000000000000FFull) << 56))
+#define SPOOKYHASH_LITTLE_ENDIAN_32(b)   ((((b) & 0xFF000000) >> 24) | (((b) & 0x00FF0000) >> 8) | (((b) & 0x0000FF00) << 8) | (((b) & 0x000000FF) << 24))
+#define SPOOKYHASH_LITTLE_ENDIAN_16(b)   ((((b) & 0xFF00) >> 8) | (((b) & 0x00FF) << 8))
+#endif
+#else
+#error Unknow endianness
+#endif
+
+
+class SpookyHash
+{
+public:
+    //
+    // SpookyHash: hash a single message in one call, produce 128-bit output
+    //
+    static void Hash128(
+        const void *message,  // message to hash
+        size_t length,        // length of message in bytes
+        uint64 *hash1,        // in/out: in seed 1, out hash value 1
+        uint64 *hash2);       // in/out: in seed 2, out hash value 2
+
+    //
+    // Hash64: hash a single message in one call, return 64-bit output
+    //
+    static uint64 Hash64(
+        const void *message,  // message to hash
+        size_t length,        // length of message in bytes
+        uint64 seed)          // seed
+    {
+        uint64 hash1 = seed;
+        Hash128(message, length, &hash1, &seed);
+        return hash1;
+    }
+
+    //
+    // Hash32: hash a single message in one call, produce 32-bit output
+    //
+    static uint32 Hash32(
+        const void *message,  // message to hash
+        size_t length,        // length of message in bytes
+        uint32 seed)          // seed
+    {
+        uint64 hash1 = seed, hash2 = seed;
+        Hash128(message, length, &hash1, &hash2);
+        return (uint32)hash1;
+    }
+
+    //
+    // Init: initialize the context of a SpookyHash
+    //
+    void Init(
+        uint64 seed1,       // any 64-bit value will do, including 0
+        uint64 seed2);      // different seeds produce independent hashes
+    
+    //
+    // Update: add a piece of a message to a SpookyHash state
+    //
+    void Update(
+        const void *message,  // message fragment
+        size_t length);       // length of message fragment in bytes
+
+    //
+    // Final: compute the hash for the current SpookyHash state
+    //
+    // This does not modify the state; you can keep updating it afterward
+    //
+    // The result is the same as if SpookyHash() had been called with
+    // all the pieces concatenated into one message.
+    //
+    void Final(uint64* hash1,  // out only: first 64 bits of hash value.
+               uint64* hash2) const;  // out only: second 64 bits of hash value.
+
+    //
+    // left rotate a 64-bit value by k bytes
+    //
+    static INLINE uint64 Rot64(uint64 x, int k)
+    {
+        return (x << k) | (x >> (64 - k));
+    }
+
+    //
+    // This is used if the input is 96 bytes long or longer.
+    //
+    // The internal state is fully overwritten every 96 bytes.
+    // Every input bit appears to cause at least 128 bits of entropy
+    // before 96 other bytes are combined, when run forward or backward
+    //   For every input bit,
+    //   Two inputs differing in just that input bit
+    //   Where "differ" means xor or subtraction
+    //   And the base value is random
+    //   When run forward or backwards one Mix
+    // I tried 3 pairs of each; they all differed by at least 212 bits.
+    //
+    static INLINE void Mix(
+        const uint64 *data, 
+        uint64 &s0, uint64 &s1, uint64 &s2, uint64 &s3,
+        uint64 &s4, uint64 &s5, uint64 &s6, uint64 &s7,
+        uint64 &s8, uint64 &s9, uint64 &s10,uint64 &s11)
+    {
+      s0 += SPOOKYHASH_LITTLE_ENDIAN_64(data[0]);
+      s2 ^= s10;    s11 ^= s0;    s0 = Rot64(s0,11);    s11 += s1;
+      s1 += SPOOKYHASH_LITTLE_ENDIAN_64(data[1]);
+      s3 ^= s11;    s0 ^= s1;    s1 = Rot64(s1,32);    s0 += s2;
+      s2 += SPOOKYHASH_LITTLE_ENDIAN_64(data[2]);
+      s4 ^= s0;    s1 ^= s2;    s2 = Rot64(s2,43);    s1 += s3;
+      s3 += SPOOKYHASH_LITTLE_ENDIAN_64(data[3]);
+      s5 ^= s1;    s2 ^= s3;    s3 = Rot64(s3,31);    s2 += s4;
+      s4 += SPOOKYHASH_LITTLE_ENDIAN_64(data[4]);
+      s6 ^= s2;    s3 ^= s4;    s4 = Rot64(s4,17);    s3 += s5;
+      s5 += SPOOKYHASH_LITTLE_ENDIAN_64(data[5]);
+      s7 ^= s3;    s4 ^= s5;    s5 = Rot64(s5,28);    s4 += s6;
+      s6 += SPOOKYHASH_LITTLE_ENDIAN_64(data[6]);
+      s8 ^= s4;    s5 ^= s6;    s6 = Rot64(s6,39);    s5 += s7;
+      s7 += SPOOKYHASH_LITTLE_ENDIAN_64(data[7]);
+      s9 ^= s5;    s6 ^= s7;    s7 = Rot64(s7,57);    s6 += s8;
+      s8 += SPOOKYHASH_LITTLE_ENDIAN_64(data[8]);
+      s10 ^= s6;    s7 ^= s8;    s8 = Rot64(s8,55);    s7 += s9;
+      s9 += SPOOKYHASH_LITTLE_ENDIAN_64(data[9]);
+      s11 ^= s7;    s8 ^= s9;    s9 = Rot64(s9,54);    s8 += s10;
+      s10 += SPOOKYHASH_LITTLE_ENDIAN_64(data[10]);
+      s0 ^= s8;    s9 ^= s10;    s10 = Rot64(s10,22);    s9 += s11;
+      s11 += SPOOKYHASH_LITTLE_ENDIAN_64(data[11]);
+      s1 ^= s9;    s10 ^= s11;    s11 = Rot64(s11,46);    s10 += s0;
+    }
+
+    //
+    // Mix all 12 inputs together so that h0, h1 are a hash of them all.
+    //
+    // For two inputs differing in just the input bits
+    // Where "differ" means xor or subtraction
+    // And the base value is random, or a counting value starting at that bit
+    // The final result will have each bit of h0, h1 flip
+    // For every input bit,
+    // with probability 50 +- .3%
+    // For every pair of input bits,
+    // with probability 50 +- 3%
+    //
+    // This does not rely on the last Mix() call having already mixed some.
+    // Two iterations was almost good enough for a 64-bit result, but a
+    // 128-bit result is reported, so End() does three iterations.
+    //
+    static INLINE void EndPartial(
+        uint64 &h0, uint64 &h1, uint64 &h2, uint64 &h3,
+        uint64 &h4, uint64 &h5, uint64 &h6, uint64 &h7, 
+        uint64 &h8, uint64 &h9, uint64 &h10,uint64 &h11)
+    {
+        h11+= h1;    h2 ^= h11;   h1 = Rot64(h1,44);
+        h0 += h2;    h3 ^= h0;    h2 = Rot64(h2,15);
+        h1 += h3;    h4 ^= h1;    h3 = Rot64(h3,34);
+        h2 += h4;    h5 ^= h2;    h4 = Rot64(h4,21);
+        h3 += h5;    h6 ^= h3;    h5 = Rot64(h5,38);
+        h4 += h6;    h7 ^= h4;    h6 = Rot64(h6,33);
+        h5 += h7;    h8 ^= h5;    h7 = Rot64(h7,10);
+        h6 += h8;    h9 ^= h6;    h8 = Rot64(h8,13);
+        h7 += h9;    h10^= h7;    h9 = Rot64(h9,38);
+        h8 += h10;   h11^= h8;    h10= Rot64(h10,53);
+        h9 += h11;   h0 ^= h9;    h11= Rot64(h11,42);
+        h10+= h0;    h1 ^= h10;   h0 = Rot64(h0,54);
+    }
+
+    static INLINE void End(
+        const uint64 *data, 
+        uint64 &h0, uint64 &h1, uint64 &h2, uint64 &h3,
+        uint64 &h4, uint64 &h5, uint64 &h6, uint64 &h7, 
+        uint64 &h8, uint64 &h9, uint64 &h10,uint64 &h11)
+    {
+        h0 += SPOOKYHASH_LITTLE_ENDIAN_64(data[0]);
+        h1 += SPOOKYHASH_LITTLE_ENDIAN_64(data[1]);
+        h2 += SPOOKYHASH_LITTLE_ENDIAN_64(data[2]);
+        h3 += SPOOKYHASH_LITTLE_ENDIAN_64(data[3]);
+        h4 += SPOOKYHASH_LITTLE_ENDIAN_64(data[4]);
+        h5 += SPOOKYHASH_LITTLE_ENDIAN_64(data[5]);
+        h6 += SPOOKYHASH_LITTLE_ENDIAN_64(data[6]);
+        h7 += SPOOKYHASH_LITTLE_ENDIAN_64(data[7]);
+        h8 += SPOOKYHASH_LITTLE_ENDIAN_64(data[8]);
+        h9 += SPOOKYHASH_LITTLE_ENDIAN_64(data[9]);
+        h10 += SPOOKYHASH_LITTLE_ENDIAN_64(data[10]);
+        h11 += SPOOKYHASH_LITTLE_ENDIAN_64(data[11]);
+        EndPartial(h0,h1,h2,h3,h4,h5,h6,h7,h8,h9,h10,h11);
+        EndPartial(h0,h1,h2,h3,h4,h5,h6,h7,h8,h9,h10,h11);
+        EndPartial(h0,h1,h2,h3,h4,h5,h6,h7,h8,h9,h10,h11);
+    }
+
+    //
+    // The goal is for each bit of the input to expand into 128 bits of 
+    //   apparent entropy before it is fully overwritten.
+    // n trials both set and cleared at least m bits of h0 h1 h2 h3
+    //   n: 2   m: 29
+    //   n: 3   m: 46
+    //   n: 4   m: 57
+    //   n: 5   m: 107
+    //   n: 6   m: 146
+    //   n: 7   m: 152
+    // when run forwards or backwards
+    // for all 1-bit and 2-bit diffs
+    // with diffs defined by either xor or subtraction
+    // with a base of all zeros plus a counter, or plus another bit, or random
+    //
+    static INLINE void ShortMix(uint64 &h0, uint64 &h1, uint64 &h2, uint64 &h3)
+    {
+        h2 = Rot64(h2,50);  h2 += h3;  h0 ^= h2;
+        h3 = Rot64(h3,52);  h3 += h0;  h1 ^= h3;
+        h0 = Rot64(h0,30);  h0 += h1;  h2 ^= h0;
+        h1 = Rot64(h1,41);  h1 += h2;  h3 ^= h1;
+        h2 = Rot64(h2,54);  h2 += h3;  h0 ^= h2;
+        h3 = Rot64(h3,48);  h3 += h0;  h1 ^= h3;
+        h0 = Rot64(h0,38);  h0 += h1;  h2 ^= h0;
+        h1 = Rot64(h1,37);  h1 += h2;  h3 ^= h1;
+        h2 = Rot64(h2,62);  h2 += h3;  h0 ^= h2;
+        h3 = Rot64(h3,34);  h3 += h0;  h1 ^= h3;
+        h0 = Rot64(h0,5);   h0 += h1;  h2 ^= h0;
+        h1 = Rot64(h1,36);  h1 += h2;  h3 ^= h1;
+    }
+
+    //
+    // Mix all 4 inputs together so that h0, h1 are a hash of them all.
+    //
+    // For two inputs differing in just the input bits
+    // Where "differ" means xor or subtraction
+    // And the base value is random, or a counting value starting at that bit
+    // The final result will have each bit of h0, h1 flip
+    // For every input bit,
+    // with probability 50 +- .3% (it is probably better than that)
+    // For every pair of input bits,
+    // with probability 50 +- .75% (the worst case is approximately that)
+    //
+    static INLINE void ShortEnd(uint64 &h0, uint64 &h1, uint64 &h2, uint64 &h3)
+    {
+        h3 ^= h2;  h2 = Rot64(h2,15);  h3 += h2;
+        h0 ^= h3;  h3 = Rot64(h3,52);  h0 += h3;
+        h1 ^= h0;  h0 = Rot64(h0,26);  h1 += h0;
+        h2 ^= h1;  h1 = Rot64(h1,51);  h2 += h1;
+        h3 ^= h2;  h2 = Rot64(h2,28);  h3 += h2;
+        h0 ^= h3;  h3 = Rot64(h3,9);   h0 += h3;
+        h1 ^= h0;  h0 = Rot64(h0,47);  h1 += h0;
+        h2 ^= h1;  h1 = Rot64(h1,54);  h2 += h1;
+        h3 ^= h2;  h2 = Rot64(h2,32);  h3 += h2;
+        h0 ^= h3;  h3 = Rot64(h3,25);  h0 += h3;
+        h1 ^= h0;  h0 = Rot64(h0,63);  h1 += h0;
+    }
+    
+private:
+
+    //
+    // Short is used for messages under 192 bytes in length
+    // Short has a low startup cost, the normal mode is good for long
+    // keys, the cost crossover is at about 192 bytes.  The two modes were
+    // held to the same quality bar.
+    // 
+    static void Short(
+        const void *message,  // message (array of bytes, not necessarily aligned)
+        size_t length,        // length of message (in bytes)
+        uint64 *hash1,        // in/out: in the seed, out the hash value
+        uint64 *hash2);       // in/out: in the seed, out the hash value
+
+    // number of uint64's in internal state
+    static const size_t sc_numVars = 12;
+
+    // size of the internal state
+    static const size_t sc_blockSize = sc_numVars*8;
+
+    // size of buffer of unhashed data, in bytes
+    static const size_t sc_bufSize = 2*sc_blockSize;
+
+    //
+    // sc_const: a constant which:
+    //  * is not zero
+    //  * is odd
+    //  * is a not-very-regular mix of 1's and 0's
+    //  * does not need any other special mathematical properties
+    //
+    static const uint64 sc_const = 0xdeadbeefdeadbeefLL;
+
+    uint64 m_data[2*sc_numVars];   // unhashed data, for partial messages
+    uint64 m_state[sc_numVars];  // internal state of the hash
+    size_t m_length;             // total length of the input so far
+    uint8  m_remainder;          // length of unhashed data stashed in m_data
+};
+
+
+#endif