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Crc64.cc
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Crc64.cc
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// Copyright 2013 Danny Yates
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include <node.h>
#include <v8.h>
#include <node_buffer.h>
#include "Crc64.h"
using namespace v8;
using namespace node;
extern "C"
uint64_t crc64(uint64_t crc, const unsigned char *s, uint64_t l);
void Crc64::Init(Handle<Object> exports) {
Local<FunctionTemplate> tpl = FunctionTemplate::New(New);
tpl->SetClassName(String::NewSymbol("Crc64"));
tpl->InstanceTemplate()->SetInternalFieldCount(1);
tpl->PrototypeTemplate()->Set(String::NewSymbol("push"), FunctionTemplate::New(Push)->GetFunction());
tpl->PrototypeTemplate()->Set(String::NewSymbol("value"), FunctionTemplate::New(GetValue)->GetFunction());
Persistent<Function> constructor = Persistent<Function>::New(tpl->GetFunction());
exports->Set(String::NewSymbol("Crc64"), constructor);
}
Crc64::Crc64() {
crc = 0;
}
Crc64::~Crc64() {}
Handle<Value> Crc64::New(const Arguments& args) {
if (args.Length() != 0) {
return ThrowException(Exception::Error(String::New("Unexpected arguments")));
}
HandleScope scope;
Crc64* obj = new Crc64();
obj->Wrap(args.This());
return args.This();
}
Handle<Value> Crc64::Push(const Arguments& args) {
if (args.Length() != 1 || !Buffer::HasInstance(args[0])) {
return ThrowException(Exception::Error(String::New("Expecting a single Buffer argument")));
}
HandleScope scope;
Crc64* obj = ObjectWrap::Unwrap<Crc64>(args.This());
Local<Object> bytes = args[0]->ToObject();
obj->crc = crc64(obj->crc, (unsigned char *)Buffer::Data(bytes), Buffer::Length(bytes));
return Undefined();
}
Handle<Value> Crc64::GetValue(const Arguments& args) {
if (args.Length() != 0) {
return ThrowException(Exception::Error(String::New("Unexpected arguments")));
}
HandleScope scope;
Crc64* obj = ObjectWrap::Unwrap<Crc64>(args.This());
Buffer* BufferOut = Buffer::New((char*)&(obj->crc), sizeof(uint64_t));
return scope.Close(BufferOut->handle_);
}
extern "C"
void init(Handle<Object> exports) {
Crc64::Init(exports);
}
NODE_MODULE(Crc64, init)