diff options
| author | Matt Corallo <git@bluematt.me> | 2013-01-10 13:16:00 -0500 |
|---|---|---|
| committer | Matt Corallo <git@bluematt.me> | 2013-01-16 12:48:01 -0500 |
| commit | 7ab026f4493b145f2255d816864cb1a3486e0788 (patch) | |
| tree | 72a9b123331434c3ac8f2cf837692f6ec3413793 /src | |
| parent | 68feac96b67b80a4fe59c4f349b58af9c77e2709 (diff) | |
Add MurmurHash3 implementation to hash.h/add hash.cpp.
Diffstat (limited to 'src')
| -rw-r--r-- | src/hash.cpp | 58 | ||||
| -rw-r--r-- | src/hash.h | 3 | ||||
| -rw-r--r-- | src/makefile.linux-mingw | 1 | ||||
| -rw-r--r-- | src/makefile.mingw | 1 | ||||
| -rw-r--r-- | src/makefile.osx | 1 | ||||
| -rw-r--r-- | src/makefile.unix | 1 |
6 files changed, 65 insertions, 0 deletions
diff --git a/src/hash.cpp b/src/hash.cpp new file mode 100644 index 0000000000..bddd8abf38 --- /dev/null +++ b/src/hash.cpp @@ -0,0 +1,58 @@ +#include "hash.h" + +inline uint32_t ROTL32 ( uint32_t x, int8_t r ) +{ + return (x << r) | (x >> (32 - r)); +} + +unsigned int MurmurHash3(unsigned int nHashSeed, const std::vector<unsigned char>& vDataToHash) +{ + // The following is MurmurHash3 (x86_32), see http://code.google.com/p/smhasher/source/browse/trunk/MurmurHash3.cpp + uint32_t h1 = nHashSeed; + const uint32_t c1 = 0xcc9e2d51; + const uint32_t c2 = 0x1b873593; + + const int nblocks = vDataToHash.size() / 4; + + //---------- + // body + const uint32_t * blocks = (const uint32_t *)(&vDataToHash[0] + nblocks*4); + + for(int i = -nblocks; i; i++) + { + uint32_t k1 = blocks[i]; + + k1 *= c1; + k1 = ROTL32(k1,15); + k1 *= c2; + + h1 ^= k1; + h1 = ROTL32(h1,13); + h1 = h1*5+0xe6546b64; + } + + //---------- + // tail + const uint8_t * tail = (const uint8_t*)(&vDataToHash[0] + nblocks*4); + + uint32_t k1 = 0; + + switch(vDataToHash.size() & 3) + { + case 3: k1 ^= tail[2] << 16; + case 2: k1 ^= tail[1] << 8; + case 1: k1 ^= tail[0]; + k1 *= c1; k1 = ROTL32(k1,15); k1 *= c2; h1 ^= k1; + }; + + //---------- + // finalization + h1 ^= vDataToHash.size(); + h1 ^= h1 >> 16; + h1 *= 0x85ebca6b; + h1 ^= h1 >> 13; + h1 *= 0xc2b2ae35; + h1 ^= h1 >> 16; + + return h1; +} diff --git a/src/hash.h b/src/hash.h index bc013139bb..eaa1780c04 100644 --- a/src/hash.h +++ b/src/hash.h @@ -10,6 +10,7 @@ #include <openssl/sha.h> #include <openssl/ripemd.h> +#include <vector> template<typename T1> inline uint256 Hash(const T1 pbegin, const T1 pend) @@ -113,4 +114,6 @@ inline uint160 Hash160(const std::vector<unsigned char>& vch) return hash2; } +unsigned int MurmurHash3(unsigned int nHashSeed, const std::vector<unsigned char>& vDataToHash); + #endif diff --git a/src/makefile.linux-mingw b/src/makefile.linux-mingw index 47dc7c5c40..95e7e83cd0 100644 --- a/src/makefile.linux-mingw +++ b/src/makefile.linux-mingw @@ -83,6 +83,7 @@ OBJS= \ obj/wallet.o \ obj/walletdb.o \ obj/noui.o \ + obj/hash.o \ obj/leveldb.o \ obj/txdb.o diff --git a/src/makefile.mingw b/src/makefile.mingw index 22d65d6703..2abc34478d 100644 --- a/src/makefile.mingw +++ b/src/makefile.mingw @@ -78,6 +78,7 @@ OBJS= \ obj/util.o \ obj/wallet.o \ obj/walletdb.o \ + obj/hash.o \ obj/noui.o \ obj/leveldb.o \ obj/txdb.o diff --git a/src/makefile.osx b/src/makefile.osx index 25164c8679..474f17b735 100644 --- a/src/makefile.osx +++ b/src/makefile.osx @@ -96,6 +96,7 @@ OBJS= \ obj/util.o \ obj/wallet.o \ obj/walletdb.o \ + obj/hash.o \ obj/noui.o \ obj/leveldb.o \ obj/txdb.o diff --git a/src/makefile.unix b/src/makefile.unix index 9e17e8ace2..979a4a6520 100644 --- a/src/makefile.unix +++ b/src/makefile.unix @@ -127,6 +127,7 @@ OBJS= \ obj/util.o \ obj/wallet.o \ obj/walletdb.o \ + obj/hash.o \ obj/noui.o \ obj/leveldb.o \ obj/txdb.o |