Function load

src/resource/package_resource.cpp:323–355

namespace package_resource_internal
{
	void *load(File &file, Allocator &a)
	{
		u32 version;
		u32 compressed_size;
		u32 uncompressed_size;
		BinaryReader br(file);

		br.read(version);
		CE_ENSURE(version == RESOURCE_HEADER(RESOURCE_VERSION_PACKAGE));
		br.read(compressed_size);

		if (compressed_size == 0) {
			file.seek(0);
			return simple_resource::load(file, a);
		}

		br.read(uncompressed_size);

		const u32 file_size = file.size(); // Compressed package.
		const u32 header_size = file_size - compressed_size;
		const u32 resource_size = header_size + uncompressed_size;
		char *data = (char *)a.allocate(resource_size, 16);
		char *compressed_data = (char *)a.allocate(compressed_size);

		file.seek(0);
		file.read(data, file_size - compressed_size);
		file.read(compressed_data, compressed_size);
		const int decompressed_size = LZ4_decompress_safe(compressed_data, data + header_size, compressed_size, uncompressed_size);
		CE_ASSERT(decompressed_size >= 0 && u32(decompressed_size) == uncompressed_size, "Failed to decompress data");
		CE_UNUSED(decompressed_size);
		a.deallocate(compressed_data);
		return data;
	}

} // namespace package_resource_internal