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