/*!
* ws: a node.js websocket client
* Copyright(c) 2011 Einar Otto Stangvik <einaros@gmail.com>
* MIT Licensed
*/
#include <v8.h>
#include <node.h>
#include <node_buffer.h>
#include <node_object_wrap.h>
#include <stdlib.h>
#include <string.h>
#include <wchar.h>
#include <stdio.h>
using namespace v8;
using namespace node;
class BufferUtil : public ObjectWrap
{
public:
static void Initialize(v8::Handle<v8::Object> target)
{
HandleScope scope;
Local<FunctionTemplate> t = FunctionTemplate::New(New);
t->InstanceTemplate()->SetInternalFieldCount(1);
NODE_SET_METHOD(t->GetFunction(), "unmask", BufferUtil::Unmask);
NODE_SET_METHOD(t->GetFunction(), "mask", BufferUtil::Mask);
NODE_SET_METHOD(t->GetFunction(), "merge", BufferUtil::Merge);
target->Set(String::NewSymbol("BufferUtil"), t->GetFunction());
}
protected:
static Handle<Value> New(const Arguments& args)
{
HandleScope scope;
BufferUtil* bufferUtil = new BufferUtil();
bufferUtil->Wrap(args.This());
return args.This();
}
static Handle<Value> Merge(const Arguments& args)
{
HandleScope scope;
Local<Object> bufferObj = args[0]->ToObject();
char* buffer = Buffer::Data(bufferObj);
Local<Array> array = Local<Array>::Cast(args[1]);
unsigned int arrayLength = array->Length();
unsigned int offset = 0;
unsigned int i;
for (i = 0; i < arrayLength; ++i) {
Local<Object> src = array->Get(i)->ToObject();
unsigned int length = Buffer::Length(src);
memcpy(buffer + offset, Buffer::Data(src), length);
offset += length;
}
return scope.Close(True());
}
static Handle<Value> Unmask(const Arguments& args)
{
HandleScope scope;
Local<Object> buffer_obj = args[0]->ToObject();
unsigned int length = Buffer::Length(buffer_obj);
Local<Object> mask_obj = args[1]->ToObject();
unsigned int *mask = (unsigned int*)Buffer::Data(mask_obj);
unsigned int* from = (unsigned int*)Buffer::Data(buffer_obj);
unsigned int len32 = length / 4;
unsigned int i;
for (i = 0; i < len32; ++i) *(from + i) ^= *mask;
from += i;
switch (length % 4) {
case 3: *((unsigned char*)from+2) = *((unsigned char*)from+2) ^ ((unsigned char*)mask)[2];
case 2: *((unsigned char*)from+1) = *((unsigned char*)from+1) ^ ((unsigned char*)mask)[1];
case 1: *((unsigned char*)from ) = *((unsigned char*)from ) ^ ((unsigned char*)mask)[0];
case 0:;
}
return True();
}
static Handle<Value> Mask(const Arguments& args)
{
HandleScope scope;
Local<Object> buffer_obj = args[0]->ToObject();
Local<Object> mask_obj = args[1]->ToObject();
unsigned int *mask = (unsigned int*)Buffer::Data(mask_obj);
Local<Object> output_obj = args[2]->ToObject();
unsigned int dataOffset = args[3]->Int32Value();
unsigned int length = args[4]->Int32Value();
unsigned int* to = (unsigned int*)(Buffer::Data(output_obj) + dataOffset);
unsigned int* from = (unsigned int*)Buffer::Data(buffer_obj);
unsigned int len32 = length / 4;
unsigned int i;
for (i = 0; i < len32; ++i) *(to + i) = *(from + i) ^ *mask;
to += i;
from += i;
switch (length % 4) {
case 3: *((unsigned char*)to+2) = *((unsigned char*)from+2) ^ *((unsigned char*)mask+2);
case 2: *((unsigned char*)to+1) = *((unsigned char*)from+1) ^ *((unsigned char*)mask+1);
case 1: *((unsigned char*)to ) = *((unsigned char*)from ) ^ *((unsigned char*)mask);
case 0:;
}
return True();
}
};
extern "C" void init (Handle<Object> target)
{
HandleScope scope;
BufferUtil::Initialize(target);
}
NODE_MODULE(bufferutil, init)
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