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binding.cc
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binding.cc
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// Copyright (c) 2011 Robin Zhong.
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
#include <v8.h>
#include <string.h>
#include <sstream>
#include "cityhash/src/city.h"
#define MAX_64_HASH_LEN 21
#define MAX_128_HASH_LEN MAX_64_HASH_LEN*2
using namespace v8;
Local<String>
stringify_hash(uint64 hash) {
// hash to char
char buf[MAX_64_HASH_LEN];
memset(buf, 0, MAX_64_HASH_LEN);
snprintf(buf, MAX_64_HASH_LEN, "%llu", hash);
return String::New(buf);
}
Local<String>
stringify_hash(uint128* hash) {
// hash to char
char buf[MAX_128_HASH_LEN];
memset(buf, 0, MAX_128_HASH_LEN);
snprintf(buf, MAX_128_HASH_LEN, "%llu,%llu", Uint128Low64(*hash), Uint128High64(*hash));
return String::New(buf);
}
uint64
to_uint64(const char* data, size_t len) {
std::stringstream str;
str.write(data, len);
uint64 v;
str >> v;
return v;
}
void
to_uint128(uint128* v, const char* data, size_t len) {
std::stringstream str;
uint64 i;
char* sep = strchr(data, (int)',');
if(sep == NULL) {
str.write(data, len);
str >> i;
v->first = i;
v->second = 0;
} else {
int pos = (int)(sep - data);
str.write(data, pos);
str >> i;
v->first = i;
str.clear();
str.write(sep+1, len - pos - 1);
str >> i;
v->second = i;
}
}
Handle<Value>
node_CityHash64(const Arguments& args) {
HandleScope scope;
int args_len = args.Length();
if(args_len == 0 || args_len > 3) {
return ThrowException(String::New("Invalid arguments."));
}
String::Utf8Value data(args[0]->ToString());
const char* str = *data;
size_t len = data.length();
uint64 hash;
if(args_len == 1) {
hash = CityHash64(str, len);
} else if(args_len == 2) {
String::AsciiValue seedString(args[1]->ToString());
uint64 seed = to_uint64(*seedString, seedString.length());
hash = CityHash64WithSeed(str, len, seed);
} else if(args_len == 3) {
String::AsciiValue seed0String(args[1]->ToString());
String::AsciiValue seed1String(args[2]->ToString());
uint64 seed0 = to_uint64(*seed0String, seed0String.length());
uint64 seed1 = to_uint64(*seed1String, seed1String.length());
hash = CityHash64WithSeeds(str, len, seed0, seed1);
}
return scope.Close(stringify_hash(hash));
}
Handle<Value>
node_CityHash128(const Arguments& args) {
HandleScope scope;
int args_len = args.Length();
if(args_len == 0 || args_len > 2) {
return ThrowException(String::New("Invalid arguments."));
}
String::Utf8Value data(args[0]->ToString());
const char* str = *data;
size_t len = data.length();
uint128 hash;
if(args.Length() == 2) {
uint128 seed;
String::AsciiValue seedString(args[1]->ToString());
to_uint128(&seed, *seedString, seedString.length());
hash = CityHash128WithSeed(str, len, seed);
} else {
hash = CityHash128(str, len);
}
return scope.Close(stringify_hash(&hash));
}
extern "C" void
init (Handle<Object> target) {
HandleScope scope;
target->Set(String::New("hash64"), FunctionTemplate::New(node_CityHash64)->GetFunction());
target->Set(String::New("hash128"), FunctionTemplate::New(node_CityHash128)->GetFunction());
}