/// <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>
/// Sets the value of a text frame. If the frame is a composite, the
/// first frame is used; if no frames exist for the given FrameType,
/// a new frame is added; if null is passed as the value, any frames
/// of the specified type are removed.
/// </summary>
/// <param name="frameType">The type of frame to set the value of.</param>
/// <param name="textValue">The value to assign to the frame.</param>
private void SetFrameTextValue(FrameType frameType, string textValue)
{
if (textValue == null)
{
this.RemoveFrame(frameType);
}
else
{
TextInformationFrame textFrame = GetFirstFrame(frameType) as TextInformationFrame;
if (textFrame == null)
{
textFrame = (TextInformationFrame)FrameRegistry.GetNewFrame(frameType);
this.AddFrame(textFrame);
}
textFrame.Text = textValue;
}
}
/// <summary>
/// Returns a new frame of the given type.
/// </summary>
/// <param name="frameType">The type of frame to return.</param>
/// <returns>A new frame of the given type.</returns>
public static ID3v2Frame GetNewFrame(FrameType frameType)
{
return(FrameRegistry.GetNewFrame(frameType));
}
