/// <summary>
/// Parses the frame header flags.
/// </summary>
/// <param name="flagBytes">The frame header flags.</param>
/// <param name="version">The ID3 version of the tag being parsed.</param>
private void ParseFlags(byte[] flagBytes, ID3Versions version)
{
int frameStatus;
int frameFormat;
switch (version)
{
case ID3Versions.V2_2:
// do nothing - no flags in v2.2
break;
case ID3Versions.V2_3:
frameStatus = (int)flagBytes[0];
frameFormat = (int)flagBytes[1];
frameStatus = frameStatus << 8;
headerFlags = ConvertFlags((FrameHeaderFlagsV2_3)frameStatus + frameFormat);
break;
case ID3Versions.V2_4:
frameStatus = (int)flagBytes[0];
frameFormat = (int)flagBytes[1];
frameStatus = frameStatus << 8;
headerFlags = (FrameHeaderFlagsV2_4)frameStatus + frameFormat;
break;
default:
throw new UnsupportedVersionException(version);
}
}
/// <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>
/// 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_4 flagSet, FrameHeaderFlagsV2_4 flagToCheck)
{
return((flagSet & flagToCheck) == flagToCheck);
}
/// <summary>
/// Copy constructor.
/// </summary>
/// <param name="frame">Frame to copy.</param>
protected ID3v2Frame(ID3v2Frame frame)
{
this.frameType = frame.frameType;
this.headerFlags = frame.headerFlags;
}
