/// <summary>
/// Converts ID3v2.3 frame header flags to ID3v2.4 frame header flags.
/// </summary>
/// <param name="flags2_3">ID3v2.3 frame header flags to convert.</param>
/// <returns>Converted ID3v2.4 frame header flags.</returns>
private FrameHeaderFlagsV2_4 ConvertFlags(FrameHeaderFlagsV2_3 flags2_3)
{
FrameHeaderFlagsV2_4 flags2_4 = FrameHeaderFlagsV2_4.None;
if (HasFlag(flags2_3, FrameHeaderFlagsV2_3.TagAlterPreservation))
{
flags2_4 |= FrameHeaderFlagsV2_4.TagAlterPreservation;
}
if (HasFlag(flags2_3, FrameHeaderFlagsV2_3.FileAlterPreservation))
{
flags2_4 |= FrameHeaderFlagsV2_4.FileAlterPreservation;
}
if (HasFlag(flags2_3, FrameHeaderFlagsV2_3.ReadOnly))
{
flags2_4 |= FrameHeaderFlagsV2_4.ReadOnly;
}
if (HasFlag(flags2_3, FrameHeaderFlagsV2_3.Compression))
{
flags2_4 |= FrameHeaderFlagsV2_4.Compression;
}
if (HasFlag(flags2_3, FrameHeaderFlagsV2_3.Encryption))
{
flags2_4 |= FrameHeaderFlagsV2_4.Encryption;
}
return(flags2_4);
}
/// <summary>
/// Writes the header flags 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 WriteFlags(Stream stream, ID3Versions version)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
byte formatByte;
byte statusByte;
switch (version)
{
case ID3Versions.V2_2:
break;
case ID3Versions.V2_3:
FrameHeaderFlagsV2_3 flags2_3 = ConvertFlags(this.HeaderFlags);
formatByte = (byte)flags2_3;
statusByte = (byte)(((int)flags2_3) >> 8);
stream.WriteByte(statusByte);
stream.WriteByte(formatByte);
break;
case ID3Versions.V2_4:
formatByte = (byte)this.HeaderFlags;
statusByte = (byte)(((int)this.HeaderFlags) >> 8);
stream.WriteByte(statusByte);
stream.WriteByte(formatByte);
break;
default:
throw new UnsupportedVersionException(version);
}
}
/// <summary>
/// Returns true if flagSet contains flagToCheck; false otherwise.
/// </summary>
/// <param name="flagSet">A set of flags.</param>
/// <param name="flagToCheck">A flag to be checked for.</param>
/// <returns>True if flagSet contains flagToCheck; false otherwise.</returns>
private bool HasFlag(FrameHeaderFlagsV2_3 flagSet, FrameHeaderFlagsV2_3 flagToCheck)
{
return((flagSet & flagToCheck) == flagToCheck);
}
