示例#1
0
        /// <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;
        }
示例#2
0
        /// <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));
        }