public GMAHeader ReadHeader()
{
BaseStream.Seek(0, SeekOrigin.Begin);
// Magic constant "GMAD"
byte[] magicConstant = ReadBytes(4);
if (Encoding.ASCII.GetString(magicConstant) != "GMAD")
{
throw new Exception("Invalid file type");
}
byte gmaVersion = ReadByte();
if (gmaVersion > 3)
{
throw new Exception("Unsupported GMA version " + gmaVersion);
}
GMAHeader header = new GMAHeader
{
SteamID = ReadUInt64(),
Timestamp = ReadInt64(),
RequiredContent = ReadNullTerminatedString(),
Name = ReadNullTerminatedString(),
Description = ReadNullTerminatedString(),
Author = ReadNullTerminatedString(),
Version = ReadInt32()
};
List <GMAFileHeader> files = new List <GMAFileHeader>();
long curOffset = 0;
while (ReadUInt32() > 0)
{
GMAFileHeader curFile = new GMAFileHeader
{
Path = ReadNullTerminatedString(),
Size = ReadInt64(),
CRC = ReadUInt32(),
FileNumber = files.Count,
Offset = curOffset
};
curOffset += curFile.Size;
files.Add(curFile);
}
header.DataStart = BaseStream.Position;
header.Files = files.ToArray();
return(header);
}
public GMAFile(string path)
{
_reader = new GMAReader(File.Open(path, FileMode.Open));
_header = _reader.ReadHeader();
_fileDataCache = new Dictionary <int, byte[]>();
}