public static void AnalyzeChunkSubBuffer(int currentBlock, int startPos, byte[] data, ChunkAnalysisResult chunkAnalysisResult)
{
var intBuffer = new byte[4];
var allHigh = new byte[] { 0xFF, 0xFF, 0xFF, 0xFF };
using (var ms2 = new MemoryStream(data))
{
Console.WriteLine();
Console.WriteLine($"Info for block #{currentBlock} starting at {startPos} length {data.Length} end {startPos+data.Length}");
Console.WriteLine($"-------------------------------");
var blockMagic = new byte[4];
ms2.Read(blockMagic, 0, 4);
chunkAnalysisResult.BlockMagic = blockMagic;
Console.WriteLine($"Guessed block magic: {StringUtils.ByteArrayToHexString(blockMagic)}");
ms2.Read(intBuffer, 0, 4);
var pluginNameLength = BigEndian.ToInt32(intBuffer, 0);
if (pluginNameLength < ms2.Length - ms2.Position)
{
var pluginNameBuf = new byte[pluginNameLength];
ms2.Read(pluginNameBuf, 0, pluginNameLength);
if (chunkAnalysisResult.PluginName == "")
{
chunkAnalysisResult.PluginName = Encoding.BigEndianUnicode.GetString(pluginNameBuf);
}
Console.WriteLine($"Guessed plugin name: {Encoding.BigEndianUnicode.GetString(pluginNameBuf)}");
}
else
{
ms2.Seek(-4, SeekOrigin.End);
var buf3 = new byte[4];
ms2.Read(buf3, 0, 4);
if (buf3.SequenceEqual(allHigh))
{
chunkAnalysisResult.EndChunk = ms2.ToByteArray();
Console.WriteLine("Probably the page stuff (end chunk?)");
}
else
{
ms2.Seek(0, SeekOrigin.Begin);
var presetBuf = new byte[data.Length];
ms2.Read(presetBuf, 0, data.Length);
chunkAnalysisResult.HasPresetNameAtEnd = true;
Console.WriteLine($"Probably the current preset name? Decoded: {Encoding.ASCII.GetString(presetBuf)}");
}
return;
}
var buf2 = new byte[4];
ms2.Read(buf2, 0, 4);
var empty = new byte[] { 0x00, 0x00, 0x00, 0x00 };
if (buf2.SequenceEqual(empty))
{
Console.WriteLine("Got 4x 0x00 after the plugin name");
}
else
{
Console.WriteLine("Did NOT get 4x 0x00 after the plugin name");
}
ms2.Read(intBuffer, 0, 4);
if (intBuffer.SequenceEqual(allHigh))
{
ms2.Read(intBuffer, 0, 4);
if (intBuffer.SequenceEqual(Tfx.DEADBEEF))
{
Console.WriteLine("Empty block without data");
}
else
{
var midiBlockLength = BigEndian.ToInt32(intBuffer, 0);
if (ms2.Position + midiBlockLength + 4 == ms2.Length)
{
chunkAnalysisResult.HasMidi = true;
if (midiBlockLength == 4)
{
chunkAnalysisResult.HasEmptyMidi = true;
}
Console.WriteLine("Is probably a midi buffer");
}
else
{
Console.WriteLine("Unknown block?");
}
}
}
else
{
var subBlockLength = BigEndian.ToInt32(intBuffer, 0);
if (ms2.Length - ms2.Position - 4 == subBlockLength)
{
Console.WriteLine($"Sub block length matches length {subBlockLength}");
}
else
{
Console.WriteLine("Sub block length does NOT match length");
}
}
var buf = new byte[4];
ms2.Seek(-4, SeekOrigin.End);
ms2.Read(buf, 0, 4);
if (buf.SequenceEqual(Tfx.DEADBEEF))
{
Console.WriteLine("Ends with DEADBEEF");
}
else
{
Console.WriteLine("Does not end with DEADBEEF");
}
}
}
public static ChunkAnalysisResult AnalyzeChunk(byte[] data, string file)
{
var chunkAnalysisResult = new ChunkAnalysisResult();
var intBuffer = new byte[4];
Console.WriteLine($"Chunk Info for {file}");
Console.WriteLine(
"=======================================================================================================");
Console.WriteLine("");
using (var ms = new MemoryStream(data))
{
ms.Read(intBuffer, 0, 4);
var totalLength = LittleEndian.ToInt32(intBuffer, 0);
var lengthDifference = ms.Length - totalLength - 16;
Console.WriteLine(
$"Content total length: {totalLength} (length difference: {lengthDifference}, should be 0)");
ms.Seek(12, SeekOrigin.Current);
ms.Read(intBuffer, 0, 4);
var numParameters = LittleEndian.ToInt32(intBuffer, 0);
Console.WriteLine($"Num parameters: {numParameters}");
chunkAnalysisResult.NumParameters = numParameters;
ms.Seek(numParameters * 4, SeekOrigin.Current);
var currentBlock = 0;
while (true)
{
currentBlock++;
if (ms.Position == ms.Length)
{
break;
}
ms.Read(intBuffer, 0, 4);
var blockLength = LittleEndian.ToInt32(intBuffer, 0);
var startPos = ms.Position;
if (ms.Position + blockLength > ms.Length)
{
Console.WriteLine(
$"Error reading block starting at {ms.Position - 4}: Block length exceeds file size");
break;
}
if (blockLength == 0)
{
var unknownBlockStart = ms.Position;
ms.Read(intBuffer, 0, 4);
var subBlockLength = LittleEndian.ToInt32(intBuffer, 0);
var blockBuffer = new byte[subBlockLength];
if (subBlockLength == 0)
{
Console.WriteLine();
Console.WriteLine($"Info for block #{currentBlock} starting at {unknownBlockStart} length {subBlockLength} end {unknownBlockStart+subBlockLength}");
Console.WriteLine($"-------------------------------");
Console.WriteLine("Empty unknown data block");
continue;
}
ms.Seek(-4, SeekOrigin.Current);
ms.Read(blockBuffer, 0, subBlockLength);
Console.WriteLine();
Console.WriteLine($"Info for block #{currentBlock} starting at {unknownBlockStart} length {subBlockLength} end {unknownBlockStart+subBlockLength}");
Console.WriteLine($"-------------------------------");
Console.WriteLine("Unknown data block");
}
else
{
var blockBuffer = new byte[blockLength];
ms.Read(blockBuffer, 0, blockLength);
AnalyzeChunkSubBuffer(currentBlock, (int)startPos, blockBuffer, chunkAnalysisResult);
}
}
}
return(chunkAnalysisResult);
}
