public static long GetSize(PAK_VERSION version, uint CompressionMethodIndex = 0, uint CompressionBlocksCount = 0)
{
long SerializedSize = sizeof(long) + sizeof(long) + sizeof(long) + 20;
if (version >= PAK_VERSION.PAK_FNAME_BASED_COMPRESSION_METHOD)
{
SerializedSize += sizeof(uint);
}
else
{
SerializedSize += sizeof(int); // Old CompressedMethod var from pre-fname based compression methods
}
if (version >= PAK_VERSION.PAK_COMPRESSION_ENCRYPTION)
{
SerializedSize += sizeof(byte) + sizeof(uint);
if (CompressionMethodIndex != 0)
{
SerializedSize += sizeof(long) * 2 * CompressionBlocksCount + sizeof(int);
}
}
if (version < PAK_VERSION.PAK_NO_TIMESTAMPS)
{
// Timestamp
SerializedSize += sizeof(long);
}
return(SerializedSize);
}
internal FPakEntry(BinaryReader reader, string mountPoint, PAK_VERSION Version)
{
CompressionBlocks = null;
CompressionBlockSize = 0;
Flags = 0;
Name = mountPoint + reader.ReadFString(FPakInfo.MAX_PACKAGE_PATH).Replace(".umap", ".uasset");
var StartOffset = reader.BaseStream.Position;
Offset = reader.ReadInt64();
Size = reader.ReadInt64();
UncompressedSize = reader.ReadInt64();
if (Version < PAK_VERSION.PAK_FNAME_BASED_COMPRESSION_METHOD)
{
var LegacyCompressionMethod = reader.ReadInt32();
if (LegacyCompressionMethod == (int)ECompressionFlags.COMPRESS_None)
{
CompressionMethodIndex = 0;
}
else if ((LegacyCompressionMethod & (int)ECompressionFlags.COMPRESS_ZLIB) != 0)
{
CompressionMethodIndex = 1;
}
else if ((LegacyCompressionMethod & (int)ECompressionFlags.COMPRESS_GZIP) != 0)
{
CompressionMethodIndex = 2;
}
else if ((LegacyCompressionMethod & (int)ECompressionFlags.COMPRESS_Custom) != 0)
{
CompressionMethodIndex = 3;
}
else
{
// https://github.com/EpicGames/UnrealEngine/blob/8b6414ae4bca5f93b878afadcc41ab518b09984f/Engine/Source/Runtime/PakFile/Public/IPlatformFilePak.h#L441
throw new FileLoadException(@"Found an unknown compression type in pak file, will need to be supported for legacy files");
}
}
else
{
CompressionMethodIndex = reader.ReadUInt32();
}
if (Version <= PAK_VERSION.PAK_INITIAL)
{
// Timestamp of type FDateTime, but the serializer only reads to the Ticks property (int64)
reader.ReadInt64();
}
Hash = reader.ReadBytes(20);
if (Version >= PAK_VERSION.PAK_COMPRESSION_ENCRYPTION)
{
if (CompressionMethodIndex != 0)
{
CompressionBlocks = reader.ReadTArray(() => new FPakCompressedBlock(reader));
}
Flags = reader.ReadByte();
CompressionBlockSize = reader.ReadUInt32();
}
// Used to seek ahead to the file data instead of parsing the entry again
StructSize = (int)(reader.BaseStream.Position - StartOffset);
}
