/// <summary>
/// Writes a ROM to the pack.
/// </summary>
/// <param name="rom">The rom file to write.</param>
/// <param name="flip">Whether to flip words. <c>true</c> by default.</param>
public void SetImage(byte[] rom, bool flip = true)
{
ensureUndisposed();
if (rom == null || rom.Length == 0)
{
throw new ArgumentNullException("rom");
}
var myRom = (byte[])rom.Clone();
if (flip)
{
FlipWords(myRom);
}
WordFlipped = true;
ImageSize = (uint)myRom.Length;
ImageChecksum = CalcChecksum(myRom, true);
var compRom = new byte[(myRom.Length + 7) / 8 + myRom.Length]; // Account for worst-case scenario (completely random data)
ImageCompressedSize = (uint)Lzss.Encode(myRom, compRom);
Array.Resize <byte>(ref compRom, (int)ImageCompressedSize);
CryptBuffer(compRom, ImageChecksum ^ KeyConversionFactor, keyBytes);
pakStream.Seek(0x60, SeekOrigin.Begin);
bw.Write(compRom);
loaded = true;
}
/// <summary>
/// Gets the stored ROM image, unflipped.
/// </summary>
/// <returns>A stream with the ROM image.</returns>
public MemoryStream GetImage()
{
ensureLoaded();
pakStream.Seek(0x60, SeekOrigin.Begin);
byte[] rom = br.ReadBytes((int)ImageCompressedSize);
CryptBuffer(rom, ImageChecksum ^ KeyConversionFactor, keyBytes);
var decompRom = new byte[ImageSize];
Lzss.Decode(rom, decompRom);
if (CalcChecksum(decompRom, true) != ImageChecksum)
{
throw new InvalidDataException("Image checksum failed.");
}
if (WordFlipped)
{
FlipWords(decompRom);
}
return(new MemoryStream(decompRom));
}