public override bool ReadFromStream(FileStream fStream, bool throwExceptions)
{
/*
+-----------------------------+
| Header (10 bytes) |
+-----------------------------+
| Extended Header |
| (variable length, OPTIONAL) |
+-----------------------------+
| Frames (variable length) |
+-----------------------------+
| Padding |
| (variable length, OPTIONAL) |
+-----------------------------+
| Footer (10 bytes, OPTIONAL) |
+-----------------------------+
ID3v2/file identifier "ID3"
ID3v2 version $04 00
ID3v2 flags %abcd0000
ID3v2 size 4 * %0xxxxxxx
*/
try
{
Clear();
Loaded = false;
Active = false;
Changed = false;
Logger.Logger.WriteToLog(String.Format("Reading TAG v2 ..."));
if (fStream.Length<HeaderByteLength)
{
throw new Exception(String.Format("File length < {0}",HeaderByteLength));
}
OriginalHeader = new byte[HeaderByteLength];
fStream.Seek(0,0);
fStream.Read(OriginalHeader,0,HeaderByteLength);
byte[] id3tag2Indication = new byte[] {OriginalHeader[0],OriginalHeader[1],OriginalHeader[2]};
VersionMajor = OriginalHeader[3];
VersionRevision = OriginalHeader[4];
var totalTagSize = new byte[] {0,0,0,0};
for (var i=0;i<4;i++) totalTagSize[i] = OriginalHeader[6+i];
if (!IsValid)
{
Logger.Logger.WriteToLog("TAG v2 not found (or invalid header)");
return false;
}
TotalByteLength = Convert.ToInt32(TAG2Frame.MakeID3v2Size(totalTagSize,7));
if (FlagUnsynchronisation)
{
throw new Exception("TAG v2 Unsynchronisation not supported yet");
}
if (FlagExtendedHeader)
{
throw new Exception("Extended header not supported yet");
}
if (FlagFooter)
{
throw new Exception("Usage of footer - not supported yet");
}
long actSize = 0;
while(actSize<TotalByteLength-HeaderByteLength)
{
var frame = new TAG2Frame();
var ok = frame.ReadFromOpenedStream(fStream,VersionMajor,false);
if (!ok)
{
//if (throwExceptions) throw new Exception("Error reading frame");
if (Frames.Count == 0) Logger.Logger.WriteToLog("First Invalid frame found");
break;
}
actSize+=TAG2Frame.HeaderByteLength+frame.Size;
/*
Logger.Logger.WriteToLog(String.Format("Adding frame {0}",frame.Name));
Logger.Logger.WriteToLog("Name:"+frame.Name);
Logger.Logger.WriteToLog("Size:"+frame.Size);
Logger.Logger.WriteToLog("Value:"+frame.Value);
if (frame.Name != "APIC")
Logger.Logger.WriteToLog("Data:"+TAG2Frame.ByteArrayToDecimalStrings(frame.OriginalData));
Logger.Logger.WriteToLog("-------------");
*/
AddFrame(frame);
}
ParseBaseValues();
Logger.Logger.WriteToLog(String.Format("TAG found: (Title:{0}, Artist:{1}, ...)",Title,Artist));
Active = true;
Loaded = true;
Changed = false;
return true;
} catch (Exception ex)
{
Logger.Logger.WriteToLog(String.Format("Error while reading TAG v2"),ex);
if (throwExceptions) throw;
return false;
}
}