Method GetCompressedOutput

source/common/engine/serializer.cpp:788–841

//==========================================================================

FCompressedBuffer FSerializer::GetCompressedOutput()
{
	if (isReading()) return{ 0,0,0,0,0,nullptr };
	FCompressedBuffer buff;
	WriteObjects();
	EndObject();
	buff.filename = nullptr;
	buff.mSize = (unsigned)w->mOutString.GetSize();
	buff.mCRC32 = crc32(0, (const Bytef*)w->mOutString.GetString(), buff.mSize);

	uint8_t *compressbuf = new uint8_t[buff.mSize+1];

	z_stream stream;
	int err;

	stream.next_in = (Bytef *)w->mOutString.GetString();
	stream.avail_in = (unsigned)buff.mSize;
	stream.next_out = (Bytef*)compressbuf;
	stream.avail_out = (unsigned)buff.mSize;
	stream.zalloc = (alloc_func)0;
	stream.zfree = (free_func)0;
	stream.opaque = (voidpf)0;

	// create output in zip-compatible form as required by FCompressedBuffer
	err = deflateInit2(&stream, 8, Z_DEFLATED, -15, 9, Z_DEFAULT_STRATEGY);
	if (err != Z_OK)
	{
		goto error;
	}

	err = deflate(&stream, Z_FINISH);
	if (err != Z_STREAM_END) 
	{
		deflateEnd(&stream);
		goto error;
	}
	buff.mCompressedSize = stream.total_out;

	err = deflateEnd(&stream);
	if (err == Z_OK)
	{
		buff.mBuffer = new char[buff.mCompressedSize];
		buff.mMethod = METHOD_DEFLATE;
		memcpy(buff.mBuffer, compressbuf, buff.mCompressedSize);
		delete[] compressbuf;
		return buff;
	}

error:
	memcpy(compressbuf, w->mOutString.GetString(), buff.mSize + 1);
	buff.mCompressedSize = buff.mSize;
	buff.mMethod = METHOD_STORED;
	return buff;
}

//==========================================================================
//