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#include <node.h>
#include <node_buffer.h>
#include <assert.h>
#include <zlib.h>
namespace {
inline void CompressBytes(const v8::FunctionCallbackInfo<v8::Value>& info) {
assert(info[0]->IsArrayBufferView());
auto view = info[0].As<v8::ArrayBufferView>();
auto byte_offset = view->ByteOffset();
auto byte_length = view->ByteLength();
assert(view->HasBuffer());
auto buffer = view->Buffer();
auto contents = buffer->GetContents();
auto data = static_cast<unsigned char*>(contents.Data()) + byte_offset;
Bytef buf[1024];
z_stream stream;
stream.zalloc = nullptr;
stream.zfree = nullptr;
int err = deflateInit2(&stream, Z_DEFAULT_COMPRESSION, Z_DEFLATED,
-15, MAX_MEM_LEVEL, Z_DEFAULT_STRATEGY);
assert(err == Z_OK);
stream.avail_in = byte_length;
stream.next_in = data;
stream.avail_out = sizeof(buf);
stream.next_out = buf;
err = deflate(&stream, Z_FINISH);
assert(err == Z_STREAM_END);
auto result = node::Buffer::Copy(info.GetIsolate(),
reinterpret_cast<const char*>(buf),
sizeof(buf) - stream.avail_out);
deflateEnd(&stream);
info.GetReturnValue().Set(result.ToLocalChecked());
}
inline void Initialize(v8::Local<v8::Object> exports,
v8::Local<v8::Value> module,
v8::Local<v8::Context> context) {
auto isolate = context->GetIsolate();
auto key = v8::String::NewFromUtf8(isolate, "compressBytes");
auto value = v8::FunctionTemplate::New(isolate, CompressBytes)->GetFunction();
assert(exports->Set(context, key, value).IsJust());
}
} // anonymous namespace
NODE_MODULE_CONTEXT_AWARE(NODE_GYP_MODULE_NAME, Initialize)
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