private CacheHeader(Stream stream)
{
using (var binaryReader = new BinaryReader(stream, Encoding.Default, true))
{
// read the fourcc tag and throw on incorrect value
HeadFourCC = binaryReader.ReadTagClass();
if (HeadFourCC != (TagClass)"head")
{
throw new InvalidDataException();
}
EngineVersion = binaryReader.ReadInt32();
FileSize = binaryReader.ReadInt32();
stream.Seek(4, SeekOrigin.Current);
// Check the BuildVersion then return to the last stream position
stream.Seek(0x11C, SeekOrigin.Current);
var test = Encoding.ASCII.GetString(binaryReader.ReadBytes(32)).Trim(Char.MinValue);
Version = test == @"11081.07.04.30.0934.main" ? HaloVersion.PC_RETAIL : HaloVersion.XBOX_RETAIL;
stream.Seek(-0x13C, SeekOrigin.Current);
IndexInfo = IndexInfoStruct.DeserializeFrom(stream);
// move the stream past some unused/zeroed bytes
if (Version == HaloVersion.PC_RETAIL)
{
SharedInfoStruct.DeserializeFrom(stream);
}
stream.Seek(32 + 224, SeekOrigin.Current);
// read the build string and remove the trailing null bytes
BuildString = Encoding.ASCII.GetString(binaryReader.ReadBytes(32)).Trim(Char.MinValue);
// read the map type (ie: singleplayer, multiplayer, shared, singleplayershared, mainmenu).
Type = (MapType)binaryReader.ReadInt32();
stream.Seek(28, SeekOrigin.Current);
StringsInfo = StringsInfoStruct.DeserializeFrom(stream);
stream.Seek(36, SeekOrigin.Current);
// read the name string and remove the trailing null bytes
Name = Encoding.ASCII.GetString(binaryReader.ReadBytes(32)).Trim(Char.MinValue);
stream.Seek(4, SeekOrigin.Current);
// read the scenario string and remove the trailing null bytes
Scenario = Encoding.ASCII.GetString(binaryReader.ReadBytes(128)).Trim(Char.MinValue);
stream.Seek(128, SeekOrigin.Current);
stream.Seek(4, SeekOrigin.Current);
PathsInfo = PathsInfoStruct.DeserializeFrom(stream);
if (Version == HaloVersion.PC_RETAIL)
{
UnknownInfo = UnknownInfoStruct.DeserializeFrom(stream);
}
Checksum = binaryReader.ReadInt32();
// seek the last 4 bytes before the end of the header
stream.Seek(2044 - (int)stream.Position, SeekOrigin.Current);
FootFourCC = binaryReader.ReadTagClass();
}
}
private StringsInfoStruct GenerateStringsTable(Stream outputStream)
{
var info = new StringsInfoStruct
{
StringCount = Strings.Length,
Strings128TableAddress = outputStream.Align(512)
};
GenerateStrings128(outputStream);
info.StringIndexAddress = outputStream.Align(512);
GenerateTableIndex(outputStream, Strings);
info.StringTableAddress = outputStream.Align(512);
GenerateStringEntries(outputStream, Strings);
info.StringTableLength = ( int )outputStream.Position - info.StringTableAddress;
outputStream.Align(512);
return(info);
}
