Exemplo n.º 1
0
		public PkLiteUnpacker(IServiceProvider services, string filename, byte [] rawImg) : base(services, filename, rawImg)
		{
            var exe = new ExeImageLoader(services, filename, rawImg);
            arch = new IntelArchitecture(ProcessorMode.Real);
            platform = new MsdosPlatform(services, arch);

			uint pkLiteHdrOffset = (uint) (exe.e_cparHeader * 0x10);

			if (RawImage[pkLiteHdrOffset] != 0xB8)
				throw new ApplicationException(string.Format("Expected MOV AX,XXXX at offset 0x{0:X4}.", pkLiteHdrOffset));
			uint cparUncompressed = LoadedImage.ReadLeUInt16(RawImage, pkLiteHdrOffset + 1);
			abU = new byte[cparUncompressed * 0x10U];

			if (RawImage[pkLiteHdrOffset + 0x04C] != 0x83)
				throw new ApplicationException(string.Format("Expected ADD BX,+XX at offset 0x{0:X4}.", pkLiteHdrOffset + 0x04C));
			uint offCompressedData = pkLiteHdrOffset + RawImage[pkLiteHdrOffset + 0x04E] * 0x10u - PspSize;
			bitStm = new BitStream(RawImage, (int) offCompressedData);
		}
Exemplo n.º 2
0
		public LoadedImage Unpack(byte [] abC, Address addrLoad)
		{
			// Extract the LZ stuff.

			ImageReader rdr = new LeImageReader(abC, (uint) lzHdrOffset);
			lzIp = rdr.ReadLeUInt16();
			lzCs = rdr.ReadLeUInt16();
			ushort lzSp = rdr.ReadLeUInt16();
			ushort lzSs = rdr.ReadLeUInt16();
			ushort lzcpCompressed = rdr.ReadLeUInt16();
			ushort lzcpDecompressed = rdr.ReadLeUInt16();

			// Find the start of the compressed stream.

			int ifile = lzHdrOffset - (lzcpCompressed << 4);

			// Allocate space for the decompressed goo.

			int cbUncompressed = ((int) lzcpDecompressed + lzcpDecompressed) << 4;
			byte [] abU = new byte[cbUncompressed];

			// Decompress this sorry mess.

			int len;
			int span;
			int p = 0;
			BitStream bits = new BitStream(abC, ifile);
			for (;;)
			{
				if (bits.GetBit() != 0)
				{
					// 1....
					abU[p++] = bits.GetByte();
					continue;
				}

				if (bits.GetBit() == 0) 
				{
					// 00.....
					len = bits.GetBit() << 1;
					len |= bits.GetBit();
					len += 2;
					span = bits.GetByte() | ~0xFF;
				} 
				else
				{
					// 01.....

					span = bits.GetByte();
					len = bits.GetByte();;
					span |= ((len & ~0x07)<<5) | ~0x1FFF;
					len = (len & 0x07) + 2;
					if (len == 2)
					{
						len = bits.GetByte();

						if (len == 0)
							break;    // end mark of compressed load module 

						if (len == 1)
							continue; // segment change 
						else
							++len;
					}
				}
				for( ;len > 0; --len, ++p)
				{
					abU[p] = abU[p+span];
				}
			}

			// Create a new image based on the uncompressed data.

			this.imgLoaded = new LoadedImage(addrLoad, abU);
            this.imageMap = imgLoaded.CreateImageMap();
			return imgLoaded;
		}
Exemplo n.º 3
0
		public uint CopyDictionaryWord2(byte [] abU, int BX, int bytes, BitStream stm, uint dst)
		{
			BX = (ushort) (ab022C[BX] << 8);
			return CopyDictionaryWord(abU, BX, bytes, stm, dst);
		}
Exemplo n.º 4
0
		public uint CopyDictionaryWord(byte [] abU, int offset, int bytes, BitStream stm, uint dst)
		{
			offset |= stm.GetByte();
			var src = dst - offset;
			do 
			{
				abU[dst++] = abU[src++];
			} while (--bytes != 0);
			return dst;
		}