void SetModuleData(MdatResource resource, byte[] sampleData, bool autoDelete)
{
lock (_mutex)
{
StopSongImpl(true);
FreeResourceDataImpl();
_resource = resource;
_resourceSample = sampleData;
_deleteResource = autoDelete;
}
}
MdatResource LoadMdatFile(Stream musicData)
{
var br = new BinaryReader(musicData);
bool hasHeader = false;
var mdatSize = musicData.Length;
if (mdatSize >= 0x200)
{
// 0x0000: 10 Bytes Header "TFMX-SONG "
var buf = System.Text.Encoding.UTF8.GetString(br.ReadBytes(10));
hasHeader = buf == "TFMX-SONG ";
}
if (!hasHeader)
{
Debug.WriteLine("Tfmx: File is not a Tfmx Module");
return null;
}
var resource = new MdatResource();
resource.mdatAlloc = null;
resource.mdatOffset = 0;
resource.mdatLen = 0;
// 0x000A: int16 flags
resource.headerFlags = br.ReadUInt16BigEndian();
// 0x000C: int32 ?
// 0x0010: 6*40 Textfield
musicData.Seek(4 + 6 * 40, SeekOrigin.Current);
/* 0x0100: Songstart x 32*/
for (int i = 0; i < NumSubsongs; ++i)
resource.subsong[i].songstart = br.ReadUInt16BigEndian();
/* 0x0140: Songend x 32*/
for (int i = 0; i < NumSubsongs; ++i)
resource.subsong[i].songend = br.ReadUInt16BigEndian();
/* 0x0180: Tempo x 32*/
for (int i = 0; i < NumSubsongs; ++i)
resource.subsong[i].tempo = br.ReadUInt16BigEndian();
/* 0x01c0: unused ? */
musicData.Seek(16, SeekOrigin.Current);
/* 0x01d0: trackstep, pattern data p, macro data p */
var offTrackstep = br.ReadUInt32BigEndian();
uint offPatternP, offMacroP;
// This is how MI`s TFMX-Player tests for unpacked Modules.
if (offTrackstep == 0)
{ // unpacked File
resource.trackstepOffset = 0x600 + 0x200;
offPatternP = 0x200 + 0x200;
offMacroP = 0x400 + 0x200;
}
else
{ // packed File
resource.trackstepOffset = offTrackstep;
offPatternP = br.ReadUInt32BigEndian();
offMacroP = br.ReadUInt32BigEndian();
}
// TODO: if a File is packed it could have for Ex only 2 Patterns/Macros
// the following loops could then read beyond EOF.
// To correctly handle this it would be necessary to sort the pointers and
// figure out the number of Macros/Patterns
// We could also analyze pointers if they are correct offsets,
// so that accesses can be unchecked later
// Read in pattern starting offsets
musicData.Seek(offPatternP, SeekOrigin.Begin);
for (int i = 0; i < MaxPatternOffsets; ++i)
resource.patternOffset[i] = br.ReadUInt32BigEndian();
// use last PatternOffset (stored at 0x5FC in mdat) if unpacked File
// or fixed offset 0x200 if packed
resource.sfxTableOffset = offTrackstep != 0 ? 0x200 : resource.patternOffset[127];
// Read in macro starting offsets
musicData.Seek(offMacroP, SeekOrigin.Begin);
for (int i = 0; i < MaxMacroOffsets; ++i)
resource.macroOffset[i] = br.ReadUInt32BigEndian();
// Read in mdat-file
// TODO: we can skip everything thats already stored in the resource-structure.
var mdatOffset = offTrackstep != 0 ? 0x200 : 0x600; // 0x200 is very conservative
var allocSize = mdatSize - mdatOffset;
musicData.Seek(mdatOffset, SeekOrigin.Begin);
var mdatAlloc = br.ReadBytes((int)allocSize);
resource.mdatAlloc = mdatAlloc;
resource.mdatOffset = mdatOffset;
resource.mdatLen = (int)mdatSize;
return resource;
}
