private void ParseStream(bool resetPos)
{
if (resetPos)
{
_stream.Seek(0, SeekOrigin.Begin);
}
byte[] buf = new byte[0x180];
if (_stream.Read(buf, 0, 0x180) != 0x180)
{
throw new FileFormatException("Stream too small to contain a Comp file.");
}
if (BitConverter.ToUInt32(buf, 0) != Magic)
{
throw new FileFormatException("Stream is not a Comp file.");
}
if (BitConverter.ToUInt32(buf, 4) != LzssSignature)
{
throw new FileFormatException("Unknown Comp compression type. Only LZSS is supported.");
}
// the lengths are stored in big endian; reverse them
int decompLen = BitConverter.ToInt32(buf.Skip(0xC).Take(4).Reverse().ToArray(), 0);
int compLen = BitConverter.ToInt32(buf.Skip(0x10).Take(4).Reverse().ToArray(), 0);
if (compLen <= 0 || decompLen <= 0)
{
throw new FileFormatException("Payload cannot have a zero or negative size.");
}
byte[] compPayload = new byte[compLen];
_payload = new byte[decompLen];
if (_stream.Read(compPayload, 0, compLen) != compLen)
{
throw new FileFormatException("Stream to small to contain indicated payload.");
}
int length = Lzss.Decompress(_payload, compPayload);
if (length != decompLen)
{
throw new FileFormatException("Decompressed stream not expected size.");
}
}
private void ParseStream(bool resetPos)
{
if (resetPos)
{
_stream.Seek(0, SeekOrigin.Begin);
}
byte[] buf = new byte[0x40];
if (_stream.Read(buf, 0, 0x40) != 0x40)
{
throw new FileFormatException("Stream too small to contain an iBootImage file.");
}
if (BitConverter.ToUInt64(buf, 0) != Magic)
{
throw new FileFormatException("Stream is not an iBootImage file.");
}
if (BitConverter.ToUInt32(buf, 0xC) != LzssSignature)
{
throw new FileFormatException("Unknown iBootImage compression type. Only LZSS is supported.");
}
uint colorType = BitConverter.ToUInt32(buf, 0x10);
if (colorType == ColorGray)
{
_colorType = IBootImageColorType.Gray;
}
else if (colorType == ColorArgb)
{
_colorType = IBootImageColorType.Argb;
}
else
{
throw new FileFormatException("Unknown iBootImage color type. Only ARGB and grey are supported");
}
_width = BitConverter.ToInt16(buf, 0x14);
_height = BitConverter.ToInt16(buf, 0x16);
if (_width < 0 || _height < 0)
{
throw new FileFormatException("iBootImage cannot have a negative dimension.");
}
int compLen = (int)_stream.Length - 0x40;
int decompLen = 0;
if (_colorType == IBootImageColorType.Gray)
{
decompLen = 2 * _width * _height;
}
else //if (_colorType == IBootImageColorType.Argb)
{
decompLen = 4 * _width * _height;
}
byte[] compPayload = new byte[compLen];
_payload = new byte[decompLen];
if (_stream.Read(compPayload, 0, compLen) != compLen)
{
throw new FileFormatException("Stream to small to contain indicated payload.");
}
int length = Lzss.Decompress(_payload, compPayload);
System.Diagnostics.Debug.Assert(length == decompLen);
}