/// <summary> /// Writes the size field for this frame to a stream. /// </summary> /// <param name="stream">The stream to write to.</param> /// <param name="version">The ID3v2 version to use in writing the frame.</param> protected void WriteFrameSize(Stream stream, ID3Versions version) { if (stream == null) { throw new ArgumentNullException("stream"); } switch (version) { case ID3Versions.V2_2: stream.Write(EncodedInteger.ToBytes(this.Size, ID3V2_2FrameSizeFieldLength), 0, ID3V2_2FrameSizeFieldLength); break; case ID3Versions.V2_3: stream.Write(EncodedInteger.ToBytes(this.Size, ID3V2_3FrameSizeFieldLength), 0, ID3V2_3FrameSizeFieldLength); break; case ID3Versions.V2_4: stream.Write(SynchsafeInteger.Synchsafe(this.Size), 0, ID3V2_4FrameSizeFieldLength); break; default: throw new UnsupportedVersionException(version); } }
/// <summary> /// Reads and returns a frame from a stream. /// </summary> /// <param name="stream">The stream to read from.</param> /// <param name="version">The ID3v2 version of the tag being parsed.</param> /// <returns>The frame read from the stream.</returns> public static ID3v2Frame ReadFrame(Stream stream, ID3Versions version) { if (stream == null) { throw new ArgumentNullException("stream"); } ID3v2Frame frame = null; FrameParameters parameters = new FrameParameters(version); byte[] header = new byte[parameters.HeaderLength]; char[] idChars = new char[parameters.IDLength]; byte[] sizeBytes = new byte[parameters.SizeLength]; byte[] flags = new byte[parameters.FlagsLength]; byte[] frameData; string frameID; int size; stream.Read(header, 0, header.Length); Array.Copy(header, 0, idChars, 0, idChars.Length); Array.Copy(header, parameters.IDLength, sizeBytes, 0, sizeBytes.Length); Array.Copy(header, parameters.IDLength + parameters.SizeLength, flags, 0, flags.Length); if (idChars[0] != 0x0) { frameID = new String(idChars); if (parameters.SizeIsSynchSafe) { size = SynchsafeInteger.UnSynchsafe(sizeBytes); } else { size = EncodedInteger.ToInt(sizeBytes); } frameData = new byte[size]; stream.Read(frameData, 0, frameData.Length); FrameType frameType = FrameRegistry.GetFrameType(frameID, version); frame = FrameRegistry.GetNewFrame(frameType); frame.Initialize(flags, frameData, version); } else { frame = null; } return(frame); }
/// <summary> /// Parses the raw frame data. /// </summary> /// <param name="frameData">The raw frame data.</param> /// <param name="version">The ID3v2 version of the tag being parsed.</param> protected override void ParseFrameData(byte[] frameData, ID3Versions version) { counter = EncodedInteger.ToInt(frameData); }