/// <summary>
/// Retrieves the specified tag data as a byte array. This method does not attempt to read the tag data, it simply
/// reads the header and if present the tag bytes are read directly from the stream. This means that typical exceptions
/// that get thrown in a tag read will not occur in this method.
/// </summary>
/// <param name="version">The tag version number.</param>
/// <returns>A byte array of the tag data.</returns>
public byte[] GetTagBytes(Id3Version version)
{
Id3Handler handler = ExistingHandlers.FirstOrDefault(h => h.Version == version);
byte[] tagBytes = handler?.GetTagBytes(Stream);
return(tagBytes);
}
/// <summary>
/// Converts an ID3 tag to another version after resolving the differences between the two versions. The resultant tag
/// will have all the frames from the source tag, but those frames not recognized in the new version will be treated as
/// UnknownFrame objects.
/// Similarly, frames recognized in the output tag version, but not in the source version are converted accordingly.
/// </summary>
/// <param name="version">Version of the tag to convert to.</param>
/// <returns>The converted tag of the specified version, or null if there were any errors.</returns>
public Id3Tag ConvertTo(Id3Version version)
{
//If the requested version is the same as this version, just return the same instance.
if (Version == version)
{
return(this);
}
//Get the ID3 tag handlers for the destination and create a empty tag
var destinationHandler = Id3Handler.GetHandler(version);
Id3Tag destinationTag = destinationHandler.CreateTag();
foreach (Id3Frame sourceFrame in this)
{
if (sourceFrame is UnknownFrame unknownFrame)
{
string frameId = unknownFrame.Id;
Id3Frame destinationFrame = destinationHandler.GetFrameFromFrameId(frameId);
destinationTag.AddUntypedFrame(destinationFrame);
}
else
{
destinationTag.AddUntypedFrame(sourceFrame);
}
}
return(destinationTag);
}
/// <summary>
/// Returns a collection of all ID3 tags present in the MP3 data.
/// </summary>
/// <returns>A collection of all ID3 tags present in the MP3 data.</returns>
public IEnumerable <Id3Tag> GetAllTags()
{
var tags = new Id3Tag[ExistingHandlers.Count];
for (int i = 0; i < tags.Length; i++)
{
Id3Handler handler = ExistingHandlers[i].Handler;
tags[i] = handler.ReadTag(_stream);
}
return(tags);
}
public Id3Tag GetTag(Id3Version version, out object additionalData)
{
Id3Handler handler = ExistingHandlers.FirstOrDefault(h => h.Version == version);
if (handler != null)
{
return(handler.ReadTag(Stream, out additionalData));
}
additionalData = null;
return(null);
}
public Id3Tag GetTag(Id3TagFamily family, out object additionalData)
{
Id3Handler familyHandler = ExistingHandlers.FirstOrDefault(handler => handler.Family == family);
if (familyHandler != null)
{
return(familyHandler.ReadTag(Stream, out additionalData));
}
additionalData = null;
return(null);
}
/// <summary>
/// Deletes the ID3 tag of the specified tag family type from the MP3 data.
/// </summary>
/// <param name="family">The ID3 tag family type.</param>
public void DeleteTag(Id3TagFamily family)
{
EnsureWritePermissions(Mp3Messages.NoWritePermissions_CannotDeleteTag);
Id3Handler foundHandler = ExistingHandlers.FirstOrDefault(handler => handler.Family == family);
if (foundHandler != null)
{
foundHandler.DeleteTag(Stream);
InvalidateExistingHandlers();
}
}
/// <summary>
/// Deletes the ID3 tag of the specified version from the MP3 data.
/// </summary>
/// <param name="version">The tag version</param>
public void DeleteTag(Id3Version version)
{
EnsureWritePermissions(Mp3Messages.NoWritePermissions_CannotDeleteTag);
Id3Handler handler = ExistingHandlers.FirstOrDefault(h => h.Version == version);
if (handler != null)
{
handler.DeleteTag(Stream);
InvalidateExistingHandlers();
}
}
/// <summary>
/// Deletes the ID3 tag of the specified tag family type from the MP3 data.
/// </summary>
/// <param name="family">The ID3 tag family type.</param>
public void DeleteTag(Id3TagFamily family)
{
EnsureWritePermissions(Id3Messages.NoWritePermissions_CannotDeleteTag);
IEnumerable <RegisteredId3Handler> registeredHandlers = ExistingHandlers.GetHandlers(family);
RegisteredId3Handler registeredHandler = registeredHandlers.FirstOrDefault();
if (registeredHandler != null)
{
Id3Handler handler = registeredHandler.Handler;
handler.DeleteTag(_stream);
InvalidateExistingHandlers();
}
}
/// <summary>
/// Retrieves an ID3 tag of the specified tag family type - version 2.x or version 1.x.
/// </summary>
/// <param name="family">The ID3 tag family type required.</param>
/// <returns>The ID3 tag of the specified tag family type, or null if it doesn't exist.</returns>
public Id3Tag GetTag(Id3TagFamily family)
{
IEnumerable <RegisteredId3Handler> familyHandlers = ExistingHandlers.GetHandlers(family);
RegisteredId3Handler familyHandler = familyHandlers.FirstOrDefault();
if (familyHandler == null)
{
return(null);
}
Id3Handler handler = familyHandler.Handler;
Id3Tag tag = handler.ReadTag(_stream);
return(tag);
}
public bool WriteTag(Id3Tag tag, WriteConflictAction conflictAction = WriteConflictAction.NoAction)
{
EnsureWritePermissions(Id3Messages.NoWritePermissions_CannotWriteTag);
if (tag == null)
{
throw new ArgumentNullException("tag");
}
//The tag should specify major version number
if (tag.MajorVersion == 0)
{
throw new ArgumentException(Id3Messages.MajorTagVersionMissing, "tag");
}
//Get any existing handlers from the same family as the tag
IEnumerable <RegisteredId3Handler> familyHandlers = ExistingHandlers.GetHandlers(tag.Family);
//If a tag already exists from the same family, but is a different version than the passed tag,
//delete it if conflictAction is Replace.
RegisteredId3Handler familyHandler = familyHandlers.FirstOrDefault();
if (familyHandler != null)
{
Id3Handler handler = familyHandler.Handler;
if (handler.MajorVersion != tag.MajorVersion || handler.MinorVersion != tag.MinorVersion)
{
if (conflictAction == WriteConflictAction.NoAction)
{
return(false);
}
if (conflictAction == WriteConflictAction.Replace)
{
Id3Handler handlerCopy = handler;
handlerCopy.DeleteTag(_stream);
}
}
}
//Write the tag to the file. The handler will know how to overwrite itself.
RegisteredId3Handler registeredHandler = RegisteredHandlers.GetHandler(tag.MajorVersion, tag.MinorVersion);
bool writeSuccessful = registeredHandler.Handler.WriteTag(_stream, tag);
if (writeSuccessful)
{
InvalidateExistingHandlers();
}
return(writeSuccessful);
}
public bool WriteTag(Id3Tag tag, WriteConflictAction conflictAction = WriteConflictAction.NoAction)
{
if (tag == null)
{
throw new ArgumentNullException(nameof(tag));
}
EnsureWritePermissions(Mp3Messages.NoWritePermissions_CannotWriteTag);
//If a tag already exists from the same family, but is a different version than the passed tag,
//delete it if conflictAction is Replace.
Id3Handler familyHandler = ExistingHandlers.FirstOrDefault(handler => handler.Family == tag.Family);
if (familyHandler != null)
{
Id3Handler handler = familyHandler;
if (handler.Version != tag.Version)
{
if (conflictAction == WriteConflictAction.NoAction)
{
return(false);
}
if (conflictAction == WriteConflictAction.Replace)
{
Id3Handler handlerCopy = handler; //TODO: Why did we need a copy of the handler?
handlerCopy.DeleteTag(Stream);
}
}
}
//Write the tag to the file. The handler will know how to overwrite itself.
Id3Handler writeHandler = Id3Handler.GetHandler(tag.Version);
bool writeSuccessful = writeHandler.WriteTag(Stream, tag);
if (writeSuccessful)
{
InvalidateExistingHandlers();
}
return(writeSuccessful);
}
/// <summary>
/// Retrieves an ID3 tag of the specified version number.
/// </summary>
/// <param name="version">The tag version number.</param>
/// <returns>The ID3 tag of the specified version number, or null if it doesn't exist.</returns>
public Id3Tag GetTag(Id3Version version)
{
Id3Handler handler = ExistingHandlers.FirstOrDefault(h => h.Version == version);
return(handler?.ReadTag(Stream, out _));
}
/// <summary>
/// Retrieves an ID3 tag of the specified tag family type - version 2.x or version 1.x.
/// </summary>
/// <param name="family">The ID3 tag family type required.</param>
/// <returns>The ID3 tag of the specified tag family type, or null if it doesn't exist.</returns>
public Id3Tag GetTag(Id3TagFamily family)
{
Id3Handler familyHandler = ExistingHandlers.FirstOrDefault(handler => handler.Family == family);
return(familyHandler?.ReadTag(Stream, out _));
}
