public override TREFile Load(Stream stream)
{
var start = stream.Position;
var tag = stream.ReadString(8);
if (!tag.StartsWith(HeaderTagPrefix))
{
throw new IOException("TRE File does not contain valid TRE data");
}
if (!HeaderTagValidVersions.Any(htv => tag.EndsWith(htv)))
{
throw new IOException("TRE File does not contain valid TRE data");
}
var header = new TREFile.TreHeader
{
ResourceCount = stream.ReadInt32(),
InfoOffset = stream.ReadInt32(),
InfoCompression = stream.ReadInt32(),
InfoCompressedSize = stream.ReadInt32(),
NameCompression = stream.ReadInt32(),
NameCompressedSize = stream.ReadInt32(),
NameSize = stream.ReadInt32(),
};
stream.Seek(start + header.InfoOffset, SeekOrigin.Begin);
byte[] infoData;
if (header.InfoCompression == 0)
{
infoData = stream.ReadBytes(header.InfoSize);
}
else
{
var infoBuffer = stream.ReadBytes(header.InfoCompressedSize);
var inflater = new Inflater(false);
inflater.SetInput(infoBuffer);
infoData = new Byte[header.InfoSize];
inflater.Inflate(infoData);
}
byte[] nameData;
if (header.NameCompression == 0)
{
nameData = stream.ReadBytes(header.NameSize);
}
else
{
var nameBuffer = stream.ReadBytes(header.NameCompressedSize);
var inflater = new Inflater(false);
inflater.SetInput(nameBuffer);
nameData = new Byte[header.NameSize];
inflater.Inflate(nameData);
}
var names = new List <String>();
using (var nameStream = new MemoryStream(nameData))
while (nameStream.Position < nameStream.Length)
{
names.Add(nameStream.ReadString());
}
var infoList = new List <TREFile.TreInfo>();
using (var infoStream = new MemoryStream(infoData))
using (var infoReader = new BinaryReader(infoStream))
foreach (var name in names)
{
var info = new TREFile.TreInfo
{
Name = name,
Checksum = infoReader.ReadInt32(),
DataSize = infoReader.ReadInt32(),
DataOffset = infoReader.ReadInt32(),
DataCompression = infoReader.ReadInt32(),
DataCompressedSize = infoReader.ReadInt32(),
NameOffset = infoReader.ReadInt32()
};
infoList.Add(info);
}
return(new TREFile
{
Header = header,
InfoFiles = infoList
});
}
