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#include "../util.h"
#include "../crypto.h"
#include <stdio.h>
#include <stdint.h>
uint32_t murmur1_32(uint8_t* in, size_t len, uint32_t seed){
uint32_t m = 0xc6a4a793;
uint32_t hash = seed ^ (len * m);
for(;len >= 4; len-=4){
hash+=*(uint32_t*)in;
hash*=m;
hash^=hash >> 16;
in+=4;
}
switch(len){
case 3:
hash+=in[2]<<16;
case 2:
hash+=in[1]<<8;
case 1:
hash+=in[0];
hash*=m;
hash^=hash>>16;
break;
}
hash*=m;
hash^=hash>>10;
hash*=m;
hash^=hash>>17;
return hash;
}
uint32_t murmur2_32(uint8_t* in, size_t len, uint32_t seed){
uint32_t m = 0x5bd1e995;
uint32_t hash = seed ^ len;
for(;len >= 4; len-=4){
uint32_t k = *(uint32_t*)in;
k*=m;
k^=k>>24;
k*=m;
hash*=m;
hash^=k;
in+=4;
}
switch(len){
case 3:
hash+=in[2]<<16;
case 2:
hash+=in[1]<<8;
case 1:
hash+=in[0];
hash*=m;
break;
}
hash^=hash>>13;
hash*=m;
hash^=hash>>15;
return hash;
}
int l_murmur1_32(lua_State* L){
size_t len = 0;
uint8_t* a = (uint8_t*)luaL_checklstring(L, 1, &len);
int argv = lua_gettop(L);
uint64_t seed = 0;
if(argv > 1) seed = luaL_checkinteger(L, 2);
char digest[64];
uint64_t u = murmur1_32(a, len, seed);
sprintf(digest,"%08lx",u);
lua_pushstring(L, digest);
return 1;
}
int l_murmur2_32(lua_State* L){
size_t len = 0;
uint8_t* a = (uint8_t*)luaL_checklstring(L, 1, &len);
int argv = lua_gettop(L);
uint64_t seed = 0;
if(argv > 1) seed = luaL_checkinteger(L, 2);
char digest[64];
uint64_t u = murmur2_32(a, len, seed);
sprintf(digest,"%08lx",u);
lua_pushstring(L, digest);
return 1;
}
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