///////////////////////////////////////////////////////////////////////////////
// Saves CAS file
public static void CASSave(Stream in_file, ProgramStorage in_storage)
{
using (BinaryWriter cas_file = new BinaryWriter(in_file))
{
CASUPMHeaderType upm_header = CreateUPMHeader(in_storage);
CASProgramFileHeaderType program_header = CreateProgramFileHeader(in_storage);
cas_file.Write(upm_header);
cas_file.Write(program_header);
cas_file.Write(in_storage.Data, 0, in_storage.Length);
}
}
///////////////////////////////////////////////////////////////////////////////
// Initizes UPM header
public static CASUPMHeaderType CreateUPMHeader(ProgramStorage in_storage)
{
CASUPMHeaderType header = new CASUPMHeaderType();
ushort cas_length = (ushort)(in_storage.Length + Marshal.SizeOf(typeof(CASUPMHeaderType)) + Marshal.SizeOf(typeof(CASProgramFileHeaderType)));
header.FileType = CASBlockHeaderFileUnbuffered;
header.CopyProtect = (byte)((in_storage.CopyProtect) ? 0xff : 0x00);
header.BlockNumber = (byte)(cas_length / 128);
header.LastBlockBytes = (byte)(cas_length % 128);
return(header);
}
///////////////////////////////////////////////////////////////////////////////
// Loads CAS file
public static void CASLoad(Stream in_file, ProgramStorage in_storage)
{
CASUPMHeaderType upm_header = new CASUPMHeaderType();
CASProgramFileHeaderType program_header = new CASProgramFileHeaderType();
// open CAS file
using (BinaryReader cas_file = new BinaryReader(in_file))
{
// load UPM header
cas_file.Read(upm_header);
// load program header
cas_file.Read(program_header);
// Check validity
if (!CASCheckHeaderValidity(program_header))
{
throw new FileFormatException("Invalid CAS header");
}
if (!CASCheckUPMHeaderValidity(upm_header))
{
throw new FileFormatException("Invalid UPM header");
}
cas_file.Read(in_storage.Data, 0, program_header.FileLength);
in_storage.Length = program_header.FileLength;
in_storage.CopyProtect = (upm_header.CopyProtect != 0);
in_storage.AutoStart = (program_header.Autorun != 0);
in_storage.SetFileTypeByte(program_header.FileType);
}
// generate TVC filename
//PCToTVCFilename(g_db_file_name, in_file_name);
}
///////////////////////////////////////////////////////////////////////////////
// Checks UPM header validity
public static bool CASCheckUPMHeaderValidity(CASUPMHeaderType in_header)
{
return(in_header.FileType == CASBlockHeaderFileUnbuffered);
}
