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gecko-dev/gfx/angle/angle-long-identifier-hash-spooky.patch

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# HG changeset patch
# Parent c5e7517cbb1c38ce9821ba3deca88768b4dff066
diff --git a/gfx/angle/src/compiler/MapLongVariableNames.cpp b/gfx/angle/src/compiler/MapLongVariableNames.cpp
--- a/gfx/angle/src/compiler/MapLongVariableNames.cpp
+++ b/gfx/angle/src/compiler/MapLongVariableNames.cpp
@@ -1,29 +1,36 @@
//
// Copyright (c) 2002-2012 The ANGLE Project Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
//
#include "compiler/MapLongVariableNames.h"
+#include "spooky.h"
namespace {
TString mapLongName(int id, const TString& name, bool isGlobal)
{
ASSERT(name.size() > MAX_SHORTENED_IDENTIFIER_SIZE);
TStringStream stream;
- stream << "webgl_";
- if (isGlobal)
- stream << "g";
- stream << id;
- if (name[0] != '_')
- stream << "_";
- stream << name.substr(0, MAX_SHORTENED_IDENTIFIER_SIZE - stream.str().size());
+ uint64 hash = SpookyHash::Hash64(name.data(), name.length(), 0);
+
+ // We want to avoid producing a string with a double underscore,
+ // which would be an illegal GLSL identifier. We can assume that the
+ // original identifier doesn't have a double underscore, otherwise
+ // it's illegal anyway.
+ stream << (name[0] == '_' ? "webgl" : "webgl_")
+ << name.substr(0, 9)
+ << (name[8] == '_' ? "" : "_")
+ << std::hex
+ << hash;
+ ASSERT(stream.str().length() <= MAX_SHORTENED_IDENTIFIER_SIZE);
+ ASSERT(stream.str().length() >= MAX_SHORTENED_IDENTIFIER_SIZE - 2);
return stream.str();
}
LongNameMap* gLongNameMapInstance = NULL;
} // anonymous namespace
LongNameMap::LongNameMap()
diff --git a/gfx/angle/src/compiler/spooky.cpp b/gfx/angle/src/compiler/spooky.cpp
new file mode 100644
--- /dev/null
+++ b/gfx/angle/src/compiler/spooky.cpp
@@ -0,0 +1,348 @@
+// Spooky Hash
+// A 128-bit noncryptographic hash, for checksums and table lookup
+// By Bob Jenkins. Public domain.
+// Oct 31 2010: published framework, disclaimer ShortHash isn't right
+// Nov 7 2010: disabled ShortHash
+// Oct 31 2011: replace End, ShortMix, ShortEnd, enable ShortHash again
+
+#include <memory.h>
+#include <string.h>
+#include "spooky.h"
+
+#define ALLOW_UNALIGNED_READS 1
+
+//
+// short hash ... it could be used on any message,
+// but it's used by Spooky just for short messages.
+//
+void SpookyHash::Short(
+ const void *message,
+ size_t length,
+ uint64 *hash1,
+ uint64 *hash2)
+{
+ uint64 buf[sc_numVars];
+ union
+ {
+ const uint8 *p8;
+ uint32 *p32;
+ uint64 *p64;
+ size_t i;
+ } u;
+
+ u.p8 = (const uint8 *)message;
+
+ if (!ALLOW_UNALIGNED_READS && (u.i & 0x7))
+ {
+ memcpy(buf, message, length);
+ u.p64 = buf;
+ }
+
+ size_t remainder = length%32;
+ uint64 a=*hash1;
+ uint64 b=*hash2;
+ uint64 c=sc_const;
+ uint64 d=sc_const;
+
+ if (length > 15)
+ {
+ const uint64 *end = u.p64 + (length/32)*4;
+
+ // handle all complete sets of 32 bytes
+ for (; u.p64 < end; u.p64 += 4)
+ {
+ c += u.p64[0];
+ d += u.p64[1];
+ ShortMix(a,b,c,d);
+ a += u.p64[2];
+ b += u.p64[3];
+ }
+
+ //Handle the case of 16+ remaining bytes.
+ if (remainder >= 16)
+ {
+ c += u.p64[0];
+ d += u.p64[1];
+ ShortMix(a,b,c,d);
+ u.p64 += 2;
+ remainder -= 16;
+ }
+ }
+
+ // Handle the last 0..15 bytes, and its length
+ d = ((uint64)length) << 56;
+ switch (remainder)
+ {
+ case 15:
+ d += ((uint64)u.p8[14]) << 48;
+ case 14:
+ d += ((uint64)u.p8[13]) << 40;
+ case 13:
+ d += ((uint64)u.p8[12]) << 32;
+ case 12:
+ d += u.p32[2];
+ c += u.p64[0];
+ break;
+ case 11:
+ d += ((uint64)u.p8[10]) << 16;
+ case 10:
+ d += ((uint64)u.p8[9]) << 8;
+ case 9:
+ d += (uint64)u.p8[8];
+ case 8:
+ c += u.p64[0];
+ break;
+ case 7:
+ c += ((uint64)u.p8[6]) << 48;
+ case 6:
+ c += ((uint64)u.p8[5]) << 40;
+ case 5:
+ c += ((uint64)u.p8[4]) << 32;
+ case 4:
+ c += u.p32[0];
+ break;
+ case 3:
+ c += ((uint64)u.p8[2]) << 16;
+ case 2:
+ c += ((uint64)u.p8[1]) << 8;
+ case 1:
+ c += (uint64)u.p8[0];
+ break;
+ case 0:
+ c += sc_const;
+ d += sc_const;
+ }
+ ShortEnd(a,b,c,d);
+ *hash1 = a;
+ *hash2 = b;
+}
+
+
+
+
+// do the whole hash in one call
+void SpookyHash::Hash128(
+ const void *message,
+ size_t length,
+ uint64 *hash1,
+ uint64 *hash2)
+{
+ if (length < sc_bufSize)
+ {
+ Short(message, length, hash1, hash2);
+ return;
+ }
+
+ uint64 h0,h1,h2,h3,h4,h5,h6,h7,h8,h9,h10,h11;
+ uint64 buf[sc_numVars];
+ uint64 *end;
+ union
+ {
+ const uint8 *p8;
+ uint64 *p64;
+ size_t i;
+ } u;
+ size_t remainder;
+
+ h0=h3=h6=h9 = *hash1;
+ h1=h4=h7=h10 = *hash2;
+ h2=h5=h8=h11 = sc_const;
+
+ u.p8 = (const uint8 *)message;
+ end = u.p64 + (length/sc_blockSize)*sc_numVars;
+
+ // handle all whole sc_blockSize blocks of bytes
+ if (ALLOW_UNALIGNED_READS || ((u.i & 0x7) == 0))
+ {
+ while (u.p64 < end)
+ {
+ Mix(u.p64, h0,h1,h2,h3,h4,h5,h6,h7,h8,h9,h10,h11);
+ u.p64 += sc_numVars;
+ }
+ }
+ else
+ {
+ while (u.p64 < end)
+ {
+ memcpy(buf, u.p64, sc_blockSize);
+ Mix(buf, h0,h1,h2,h3,h4,h5,h6,h7,h8,h9,h10,h11);
+ u.p64 += sc_numVars;
+ }
+ }
+
+ // handle the last partial block of sc_blockSize bytes
+ remainder = (length - ((const uint8 *)end-(const uint8 *)message));
+ memcpy(buf, end, remainder);
+ memset(((uint8 *)buf)+remainder, 0, sc_blockSize-remainder);
+ ((uint8 *)buf)[sc_blockSize-1] = remainder;
+ Mix(buf, h0,h1,h2,h3,h4,h5,h6,h7,h8,h9,h10,h11);
+
+ // do some final mixing
+ End(h0,h1,h2,h3,h4,h5,h6,h7,h8,h9,h10,h11);
+ *hash1 = h0;
+ *hash2 = h1;
+}
+
+
+
+// init spooky state
+void SpookyHash::Init(uint64 seed1, uint64 seed2)
+{
+ m_length = 0;
+ m_remainder = 0;
+ m_state[0] = seed1;
+ m_state[1] = seed2;
+}
+
+
+// add a message fragment to the state
+void SpookyHash::Update(const void *message, size_t length)
+{
+ uint64 h0,h1,h2,h3,h4,h5,h6,h7,h8,h9,h10,h11;
+ size_t newLength = length + m_remainder;
+ uint8 remainder;
+ union
+ {
+ const uint8 *p8;
+ uint64 *p64;
+ size_t i;
+ } u;
+ const uint64 *end;
+
+ // Is this message fragment too short? If it is, stuff it away.
+ if (newLength < sc_bufSize)
+ {
+ memcpy(&((uint8 *)m_data)[m_remainder], message, length);
+ m_length = length + m_length;
+ m_remainder = (uint8)newLength;
+ return;
+ }
+
+ // init the variables
+ if (m_length < sc_bufSize)
+ {
+ h0=h3=h6=h9 = m_state[0];
+ h1=h4=h7=h10 = m_state[1];
+ h2=h5=h8=h11 = sc_const;
+ }
+ else
+ {
+ h0 = m_state[0];
+ h1 = m_state[1];
+ h2 = m_state[2];
+ h3 = m_state[3];
+ h4 = m_state[4];
+ h5 = m_state[5];
+ h6 = m_state[6];
+ h7 = m_state[7];
+ h8 = m_state[8];
+ h9 = m_state[9];
+ h10 = m_state[10];
+ h11 = m_state[11];
+ }
+ m_length = length + m_length;
+
+ // if we've got anything stuffed away, use it now
+ if (m_remainder)
+ {
+ uint8 prefix = sc_bufSize-m_remainder;
+ memcpy(&(((uint8 *)m_data)[m_remainder]), message, prefix);
+ u.p64 = m_data;
+ Mix(u.p64, h0,h1,h2,h3,h4,h5,h6,h7,h8,h9,h10,h11);
+ Mix(&u.p64[sc_numVars], h0,h1,h2,h3,h4,h5,h6,h7,h8,h9,h10,h11);
+ u.p8 = ((const uint8 *)message) + prefix;
+ length -= prefix;
+ }
+ else
+ {
+ u.p8 = (const uint8 *)message;
+ }
+
+ // handle all whole blocks of sc_blockSize bytes
+ end = u.p64 + (length/sc_blockSize)*sc_numVars;
+ remainder = (uint8)(length-((const uint8 *)end-u.p8));
+ if (ALLOW_UNALIGNED_READS || (u.i & 0x7) == 0)
+ {
+ while (u.p64 < end)
+ {
+ Mix(u.p64, h0,h1,h2,h3,h4,h5,h6,h7,h8,h9,h10,h11);
+ u.p64 += sc_numVars;
+ }
+ }
+ else
+ {
+ while (u.p64 < end)
+ {
+ memcpy(m_data, u.p8, sc_blockSize);
+ Mix(m_data, h0,h1,h2,h3,h4,h5,h6,h7,h8,h9,h10,h11);
+ u.p64 += sc_numVars;
+ }
+ }
+
+ // stuff away the last few bytes
+ m_remainder = remainder;
+ memcpy(m_data, end, remainder);
+
+ // stuff away the variables
+ m_state[0] = h0;
+ m_state[1] = h1;
+ m_state[2] = h2;
+ m_state[3] = h3;
+ m_state[4] = h4;
+ m_state[5] = h5;
+ m_state[6] = h6;
+ m_state[7] = h7;
+ m_state[8] = h8;
+ m_state[9] = h9;
+ m_state[10] = h10;
+ m_state[11] = h11;
+}
+
+
+// report the hash for the concatenation of all message fragments so far
+void SpookyHash::Final(uint64 *hash1, uint64 *hash2)
+{
+ // init the variables
+ if (m_length < sc_bufSize)
+ {
+ Short( m_data, m_length, hash1, hash2);
+ return;
+ }
+
+ const uint64 *data = (const uint64 *)m_data;
+ uint8 remainder = m_remainder;
+
+ uint64 h0 = m_state[0];
+ uint64 h1 = m_state[1];
+ uint64 h2 = m_state[2];
+ uint64 h3 = m_state[3];
+ uint64 h4 = m_state[4];
+ uint64 h5 = m_state[5];
+ uint64 h6 = m_state[6];
+ uint64 h7 = m_state[7];
+ uint64 h8 = m_state[8];
+ uint64 h9 = m_state[9];
+ uint64 h10 = m_state[10];
+ uint64 h11 = m_state[11];
+
+ if (remainder >= sc_blockSize)
+ {
+ // m_data can contain two blocks; handle any whole first block
+ Mix(data, h0,h1,h2,h3,h4,h5,h6,h7,h8,h9,h10,h11);
+ data += sc_numVars;
+ remainder -= sc_blockSize;
+ }
+
+ // mix in the last partial block, and the length mod sc_blockSize
+ memset(&((uint8 *)data)[remainder], 0, (sc_blockSize-remainder));
+
+ ((uint8 *)data)[sc_blockSize-1] = remainder;
+ Mix(data, h0,h1,h2,h3,h4,h5,h6,h7,h8,h9,h10,h11);
+
+ // do some final mixing
+ End(h0,h1,h2,h3,h4,h5,h6,h7,h8,h9,h10,h11);
+
+ *hash1 = h0;
+ *hash2 = h1;
+}
+
diff --git a/gfx/angle/src/compiler/spooky.h b/gfx/angle/src/compiler/spooky.h
new file mode 100644
--- /dev/null
+++ b/gfx/angle/src/compiler/spooky.h
@@ -0,0 +1,293 @@
+//
+// 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
+//
+// Up to 4 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 some platforms. 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.
+//
+
+#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
+
+
+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); // 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 += data[0]; s2 ^= s10; s11 ^= s0; s0 = Rot64(s0,11); s11 += s1;
+ s1 += data[1]; s3 ^= s11; s0 ^= s1; s1 = Rot64(s1,32); s0 += s2;
+ s2 += data[2]; s4 ^= s0; s1 ^= s2; s2 = Rot64(s2,43); s1 += s3;
+ s3 += data[3]; s5 ^= s1; s2 ^= s3; s3 = Rot64(s3,31); s2 += s4;
+ s4 += data[4]; s6 ^= s2; s3 ^= s4; s4 = Rot64(s4,17); s3 += s5;
+ s5 += data[5]; s7 ^= s3; s4 ^= s5; s5 = Rot64(s5,28); s4 += s6;
+ s6 += data[6]; s8 ^= s4; s5 ^= s6; s6 = Rot64(s6,39); s5 += s7;
+ s7 += data[7]; s9 ^= s5; s6 ^= s7; s7 = Rot64(s7,57); s6 += s8;
+ s8 += data[8]; s10 ^= s6; s7 ^= s8; s8 = Rot64(s8,55); s7 += s9;
+ s9 += data[9]; s11 ^= s7; s8 ^= s9; s9 = Rot64(s9,54); s8 += s10;
+ s10 += data[10]; s0 ^= s8; s9 ^= s10; s10 = Rot64(s10,22); s9 += s11;
+ s11 += 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(
+ uint64 &h0, uint64 &h1, uint64 &h2, uint64 &h3,
+ uint64 &h4, uint64 &h5, uint64 &h6, uint64 &h7,
+ uint64 &h8, uint64 &h9, uint64 &h10,uint64 &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);
+ 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,
+ size_t length,
+ uint64 *hash1,
+ uint64 *hash2);
+
+ // 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
+};
+
+
+
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