public static byte[] CreateExePackedImage()
{
var egaCmn = Resource.Load("EGA.CMN");
var mcgaCod = Resource.Load("MCGA.COD");
var mcgaDif = Resource.Load("MCGA.DIF");
var mcgaHdr = Resource.Load("MCGA.HDR");
var bytesInLastPage = ReadUshortAt(mcgaHdr, 2);
var pagesInExecutable = ReadUshortAt(mcgaHdr, 4);
var paragraphsInHeader = ReadUshortAt(mcgaHdr, 8);
int executableSize = pagesInExecutable << 9;
if (bytesInLastPage > 0)
{
executableSize += bytesInLastPage - 0x1f0;
}
int headerSize = paragraphsInHeader << 4;
var executableImage = new byte[executableSize];
mcgaHdr.CopyTo(executableImage, 0);
egaCmn.CopyTo(executableImage, headerSize);
mcgaCod.CopyTo(executableImage, headerSize + egaCmn.Length);
var difStream = new ReadStream(mcgaDif);
int writeOffset = headerSize - 1;
while (true)
{
var jump = (ushort)difStream.ReadShort();
if (jump == 0)
{
break;
}
writeOffset += jump & 0x7fff;
executableImage[writeOffset] = difStream.ReadByte();
executableImage[writeOffset + 1] = difStream.ReadByte();
if ((jump & 0x8000) != 0)
{
executableImage[writeOffset + 2] = difStream.ReadByte();
executableImage[writeOffset + 3] = difStream.ReadByte();
}
}
return(executableImage);
}
public static Dictionary <string, byte[]> ReadResourceMap(byte[] rawResource)
{
var result = new Dictionary <string, byte[]>();
var input = new ReadStream(rawResource);
input.Skip(4);
var resourceCount = input.ReadShort();
var ids = new string[resourceCount];
for (int i = 0; i < resourceCount; i++)
{
ids[i] = input.ReadFixedLengthString(4);
}
var sortedIds = new SortedDictionary <int, string>();
for (int i = 0; i < resourceCount; i++)
{
sortedIds[input.ReadInt()] = ids[i];
}
var data = new ReadBuffer(rawResource).Drop(6 + 8 * resourceCount);
var sortedOffsets = new List <int>(sortedIds.Keys);
sortedOffsets.Add(data.Length);
for (int i = 0; i < resourceCount; i++)
{
var startOffset = sortedOffsets[i];
var endOffset = sortedOffsets[i + 1];
result[sortedIds[startOffset]] = data.Slice(startOffset, endOffset - startOffset).ToArray();
}
return(result);
}
