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lzo.cc
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lzo.cc
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#include "minilzo209/minilzo.h"
#include <node.h>
#include <v8.h>
#include <sstream>
#include <node_buffer.h>
using namespace v8;
int compress(const unsigned char *input, unsigned char *output, lzo_uint in_len, lzo_uint& out_len) {
char* wrkmem = (char*) malloc(LZO1X_1_MEM_COMPRESS);
int result = lzo1x_1_compress(input, in_len, output, &out_len, wrkmem);
free(wrkmem);
return result;
}
lzo_uint decompress(const unsigned char *input, unsigned char *output, lzo_uint in_len, lzo_uint& out_len) {
int r = lzo1x_decompress_safe(input, in_len, output, &out_len, NULL);
if (r == LZO_E_OK)
return out_len;
else
return r;
}
void js_compress(const v8::FunctionCallbackInfo<Value>& args) {
Isolate* isolate = args.GetIsolate();
HandleScope scope(isolate);
Handle<Object> inputBuffer = args[0]->ToObject();
Handle<Object> outputBuffer = args[1]->ToObject();
lzo_uint input_len = node::Buffer::Length(inputBuffer);
lzo_uint output_len = node::Buffer::Length(outputBuffer);
int result = compress( (unsigned char *) node::Buffer::Data(inputBuffer),
(unsigned char *) node::Buffer::Data(outputBuffer),
input_len,
output_len );
Local<Object> ret = Object::New(isolate);
ret->Set(String::NewFromUtf8(isolate, "err"),
Number::New(isolate, result));
ret->Set(String::NewFromUtf8(isolate, "len"),
Number::New(isolate, (int) output_len) );
args.GetReturnValue().Set(ret);
}
void js_decompress(const v8::FunctionCallbackInfo<Value>& args) {
Isolate* isolate = args.GetIsolate();
HandleScope scope(isolate);
Handle<Object> inputBuffer = args[0]->ToObject();
Handle<Object> outputBuffer = args[1]->ToObject();
lzo_uint input_len = node::Buffer::Length(inputBuffer);
lzo_uint output_len = node::Buffer::Length(outputBuffer);
lzo_uint len = decompress( (unsigned char *) node::Buffer::Data(inputBuffer),
(unsigned char *) node::Buffer::Data(outputBuffer),
input_len,
output_len);
int err = (int) len < 0 ? (int) len : 0;
Local<Object> ret = Object::New(isolate);
ret->Set(String::NewFromUtf8(isolate, "err"),
Number::New(isolate, err));
ret->Set(String::NewFromUtf8(isolate, "len"),
Number::New(isolate, (int) len) );
args.GetReturnValue().Set(ret);
}
void Init(Local<Object> exports, Local<Context> context) {
Isolate* isolate = context->GetIsolate();
int init_result = lzo_init();
if(init_result != LZO_E_OK) {
std::stringstream ss;
ss << "lzo_init() failed and returned `" << init_result << "`. ";
ss << "Please report this on GitHub: https://github.com/schroffl/node-lzo/issues";
Local<String> err = String::NewFromUtf8(isolate, ss.str().c_str());
isolate->ThrowException(Exception::Error(err));
return;
}
// Compression
exports->Set(String::NewFromUtf8(isolate, "compress"),
FunctionTemplate::New(isolate, js_compress)->GetFunction());
// Decompression
exports->Set(String::NewFromUtf8(isolate, "decompress"),
FunctionTemplate::New(isolate, js_decompress)->GetFunction());
// Current lzo version
exports->Set(String::NewFromUtf8(isolate, "version"),
String::NewFromUtf8(isolate, lzo_version_string()));
// Date for current lzo version
exports->Set(String::NewFromUtf8(isolate, "versionDate"),
String::NewFromUtf8(isolate, lzo_version_date()));
}
#if NODE_MAJOR_VERSION >= 10
// Initialize this addon to be context-aware. See Issue #11
NODE_MODULE_INIT(/* exports, module, context */) {
Init(exports, context);
}
#else
// For backwards compatibility. See Issue #13
NODE_MODULE(node_lzo, Init)
#endif