public ID3v2(string path)
{
this.path = path;
this.frames = new ArrayList();
this.frames.Add("TPE1");
this.frames.Add("TALB");
this.frames.Add("TIT2");
this.frameIDs = new Hashtable();
this.frameIDs.Add("TP1", "TPE1");
this.frameIDs.Add("TAL", "TALB");
this.frameIDs.Add("TT2", "TIT2");
using (ID3TagFileStream fs = new ID3TagFileStream(path, FileMode.Open))
{
if (!fs.HaveID3v2())
{
fs.Close();
isComplete = false;
return;
}
version = fs.ReadVersion(); // Read ID3v2 version
fs.ReadByte(); // Throw away flags byte
// Read frames
ReadFrames(fs, fs.ReadSize());
fs.Close();
string tempPath = System.IO.Path.GetFileNameWithoutExtension(path);
if (title == "" || title == null)
{
title = tempPath;
}
if (artist == "" || artist == null)
{
artist = "Unknown";
}
if (album == "" || album == null)
{
album = "Unknown";
}
}
}
/// <summary>
/// Read all frames from specific FileStream
/// </summary>
/// <param name="Data">FileStream to read data from</param>
/// <param name="length">Length of data to read from FileStream</param>
private void ReadFrames(ID3TagFileStream dataStream, int length)
{
string frameID;
int frameLength;
byte buffer;
// Check version for frameID length
int frameIDLength = version.Minor == 2 ? 3 : 4;
// Minimum frame size is 10 because frame header is 10 byte
while (length > 10 && !isComplete)
{
// Remove padding
buffer = dataStream.ReadByte();
if (buffer == 0)
{
length--;
continue;
}
// If byte is nor zero, read frameID
dataStream.Seek(-1, SeekOrigin.Current);
// Read frame header
frameID = dataStream.ReadText(frameIDLength);
if (frameIDLength == 3 && frameIDs.Contains(frameID))
{
frameID = (string)frameIDs[frameID];
}
byte[] b = new byte[frameIDLength];
dataStream.Read(b, 0, b.Length);
frameLength = (b[0] << 24) | (b[1] << 16) | (b[2] << 8) | b[3];
// Throw away 2 flag bytes
for (int i = 0; i < 2; i++)
{
dataStream.ReadByte();
}
long pos = dataStream.Position;
if (length > 0x10000000)
{
throw (new Exception("This file contain frame that have more than 256MB data"));
}
if (frames.Contains(frameID))
{
// Throw away encoding byte
dataStream.ReadByte();
frameLength--;
string read = dataStream.ReadText(frameLength);
switch (frameID)
{
case "TPE1":
artist = read;
break;
case "TALB":
album = read;
break;
case "TIT2":
title = read;
break;
default:
break;
}
if (artist != null && album != null && title != null)
{
isComplete = true;
}
}
else
{
dataStream.Position = pos + frameLength;
}
length -= frameLength + 10;
}
}