private static int DoCompress(string infile, MemoryStream output, Formats format, out Formats actualFormat)
{
CompressionFormat fmt = null;
switch (format)
{
case Formats.LZ10: fmt = new LZ10(); break;
case Formats.LZ11: fmt = new LZ11(); break;
case Formats.LZOVL: fmt = new LZOvl(); break;
case Formats.RLE: fmt = new RLE(); break;
case Formats.HUFF4: fmt = new Huffman4(); break;
case Formats.HUFF8: fmt = new Huffman8(); break;
case Formats.HUFF:
return CompressHuff(infile, output, out actualFormat);
case Formats.GBA:
return CompressGBA(infile, output, out actualFormat);
case Formats.NDS:
return CompressNDS(infile, output, out actualFormat);
default:
throw new Exception("Unhandled compression format " + format);
}
actualFormat = format;
using (FileStream inStream = File.OpenRead(infile))
{
try
{
return fmt.Compress(inStream, inStream.Length, output);
}
catch (Exception s)
{
// any exception generated by compression is a fatal exception
Console.WriteLine(s.Message);
return -1;
}
}
}
private static int CompressBest(string infile, MemoryStream output, out Formats actualFormat, params Formats[] formats)
{
// only read the input data once from the file.
byte[] inputData;
using (FileStream inStream = File.OpenRead(infile))
{
inputData = new byte[inStream.Length];
inStream.Read(inputData, 0, inputData.Length);
}
MemoryStream bestOutput = null;
int minCompSize = int.MaxValue;
actualFormat = Formats.GBA;
foreach (Formats format in formats)
{
#region compress the file in each format, and save the best one
MemoryStream currentOutput = new MemoryStream();
CompressionFormat realFormat = null;
switch (format)
{
case Formats.HUFF4: realFormat = new Huffman4(); break;
case Formats.HUFF8: realFormat = new Huffman8(); break;
case Formats.LZ10: realFormat = new LZ10(); break;
case Formats.LZ11: realFormat = new LZ11(); break;
case Formats.LZOVL: realFormat = new LZOvl(); break;
case Formats.RLE: realFormat = new RLE(); break;
default:
Console.WriteLine("Unsupported single format: "+format);
continue;
}
int currentOutSize;
try
{
using (MemoryStream inStream = new MemoryStream(inputData))
{
currentOutSize = realFormat.Compress(inStream, inStream.Length, currentOutput);
}
}
catch (InputTooLargeException i)
{
Console.WriteLine(i.Message);
actualFormat = format;
return -1;
}
catch (Exception)
{
continue;
}
if (currentOutSize < minCompSize)
{
bestOutput = currentOutput;
minCompSize = currentOutSize;
actualFormat = format;
}
#endregion
}
if (bestOutput == null)
{
Console.WriteLine("The file could not be compressed in any format.");
return -1;
}
bestOutput.WriteTo(output);
return minCompSize;
}