internal FPakEntry(BinaryReader reader, EPakVersion Version, int SubVersion, bool caseSensitive, string pakName)
{
CompressionBlocks = null;
CompressionBlockSize = 0;
Flags = 0;
PakFileName = pakName;
string name = caseSensitive ? reader.ReadFString() : reader.ReadFString().ToLowerInvariant();
Name = name.StartsWith("/") ? name.Substring(1) : name;
var StartOffset = reader.BaseStream.Position;
Offset = reader.ReadInt64();
Size = reader.ReadInt64();
UncompressedSize = reader.ReadInt64();
if (Version < EPakVersion.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
{
if (Version == EPakVersion.FNAME_BASED_COMPRESSION_METHOD && SubVersion == 0)
{
CompressionMethodIndex = reader.ReadByte();
}
else
{
CompressionMethodIndex = reader.ReadUInt32();
}
}
if (Version < EPakVersion.NO_TIMESTAMPS)
{
reader.ReadInt64(); // Timestamp
}
reader.ReadBytes(20); // Hash
if (Version >= EPakVersion.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);
}
public FGame(EGame game, EPakVersion version, int subVersion)
{
ActualGame = game;
Version = version;
SubVersion = subVersion;
}
public FGame(EGame game, EPakVersion version)
{
ActualGame = game;
Version = version;
}