| public static ResynchByteVector ( ByteVector data ) : void | ||
| data | ByteVector |
/// A |
| return | void | |
protected ByteVector FieldData(ByteVector frameData, int offset, byte version)
{
if (frameData == null)
{
throw new ArgumentNullException("frameData");
}
int data_offset = offset + (int)FrameHeader.Size(version);
int data_length = (int)Size;
if ((Flags & (FrameFlags.Compression | FrameFlags.DataLengthIndicator)) != 0)
{
data_offset += 4;
data_length -= 4;
}
if ((Flags & FrameFlags.GroupingIdentity) != 0)
{
if (frameData.Count >= data_offset)
{
throw new TagLib.CorruptFileException("Frame data incomplete.");
}
group_id = frameData[data_offset++];
data_length--;
}
if ((Flags & FrameFlags.Encryption) != 0)
{
if (frameData.Count >= data_offset)
{
throw new TagLib.CorruptFileException("Frame data incomplete.");
}
encryption_id = frameData[data_offset++];
data_length--;
}
data_length = Math.Min(data_length, frameData.Count - data_offset);
if (data_length < 0)
{
throw new CorruptFileException("Frame size less than zero.");
}
ByteVector data = frameData.Mid(data_offset, data_length);
if ((Flags & FrameFlags.Unsynchronisation) != 0)
{
int before_length = data.Count;
SynchData.ResynchByteVector(data);
data_length -= (data.Count - before_length);
}
if ((Flags & FrameFlags.Encryption) != 0)
{
throw new NotImplementedException();
}
if ((Flags & FrameFlags.Compression) != 0)
{
throw new NotImplementedException();
}
return(data);
}
/// <summary>
/// Extracts the field data from the raw data portion of an
/// ID3v2 frame.
/// </summary>
/// <param name="frameData">
/// A <see cref="ByteVector" /> object containing fraw frame
/// data.
/// </param>
/// <param name="offset">
/// A <see cref="int" /> value containing the index at which
/// the data is contained.
/// </param>
/// <param name="version">
/// A <see cref="byte" /> value containing the ID3v2 version
/// of the data.
/// </param>
/// <returns>
/// A <see cref="ByteVector" /> object containing the
/// extracted field data.
/// </returns>
/// <remarks>
/// This method is necessary for extracting extra data
/// prepended to the frame such as the grouping ID.
/// </remarks>
/// <exception cref="ArgumentNullException">
/// <paramref name="frameData" /> is <see langword="null" />.
/// </exception>
protected ByteVector FieldData(ByteVector frameData, int offset, byte version)
{
if (frameData == null)
{
throw new ArgumentNullException(nameof(frameData));
}
int data_offset = offset + (int)FrameHeader.Size(version);
int data_length = (int)Size;
if ((Flags & (FrameFlags.Compression |
FrameFlags.DataLengthIndicator)) != 0)
{
data_offset += 4;
data_length -= 4;
}
if ((Flags & FrameFlags.GroupingIdentity) != 0)
{
if (frameData.Count >= data_offset)
{
throw new CorruptFileException("Frame data incomplete.");
}
group_id = frameData[data_offset++];
data_length--;
}
if ((Flags & FrameFlags.Encryption) != 0)
{
if (frameData.Count >= data_offset)
{
throw new CorruptFileException("Frame data incomplete.");
}
encryption_id = frameData[data_offset++];
data_length--;
}
data_length = Math.Min(data_length, frameData.Count - data_offset);
if (data_length < 0)
{
throw new CorruptFileException("Frame size less than zero.");
}
ByteVector data = frameData.Mid(data_offset, data_length);
if ((Flags & FrameFlags.Unsynchronisation) != 0)
{
int before_length = data.Count;
SynchData.ResynchByteVector(data);
data_length -= (data.Count - before_length);
}
// FIXME: Implement encryption.
if ((Flags & FrameFlags.Encryption) != 0)
{
throw new NotImplementedException();
}
// FIXME: Implement compression.
if ((Flags & FrameFlags.Compression) != 0)
{
throw new NotImplementedException();
}
/*
* if(d->header->compression()) {
* ByteVector data(frameDataLength);
* uLongf uLongTmp = frameDataLength;
* ::uncompress((Bytef *) data.data(),
* (uLongf *) &uLongTmp,
* (Bytef *) frameData.data() + frameDataOffset,
* size());
* return data;
* }
*/
return(data);
}
protected ByteVector FieldData(ByteVector frameData, int offset, byte version)
{
if (frameData == null)
{
throw new ArgumentNullException("frameData");
}
int data_offset = offset + (int)FrameHeader.Size(version);
int data_length = (int)Size;
/*int uncompressed_data_length;*/
if ((Flags & (FrameFlags.Compression | FrameFlags.DataLengthIndicator)) != 0)
{
/*uncompressed_data_length = (int) frame_data.Mid (data_offset, 4).ToUInt () + 4;*/
data_offset += 4;
data_offset -= 4;
}
if ((Flags & FrameFlags.GroupingIdentity) != 0)
{
group_id = frameData [data_offset++];
data_length--;
}
if ((Flags & FrameFlags.Encryption) != 0)
{
encryption_id = frameData [data_offset++];
data_length--;
}
if (data_length > frameData.Count - data_offset)
{
throw new CorruptFileException("Frame size exceeds bounds.");
}
if (data_length < 0)
{
throw new CorruptFileException("Frame size less than zero.");
}
ByteVector data = frameData.Mid(data_offset, data_length);
if ((Flags & FrameFlags.Unsychronisation) != 0)
{
SynchData.ResynchByteVector(data);
}
// FIXME: Implement encryption.
if ((Flags & FrameFlags.Encryption) != 0)
{
throw new NotImplementedException();
}
// FIXME: Implement compression.
if ((Flags & FrameFlags.Compression) != 0)
{
throw new NotImplementedException();
}
/*
* if(d->header->compression()) {
* ByteVector data(frameDataLength);
* uLongf uLongTmp = frameDataLength;
* ::uncompress((Bytef *) data.data(),
* (uLongf *) &uLongTmp,
* (Bytef *) frameData.data() + frameDataOffset,
* size());
* return data;
* }
*/
return(data);
}
protected void Parse(ByteVector data)
{
if (data == null)
{
throw new ArgumentNullException("data");
}
bool fullTagUnsynch = (header.MajorVersion < 4) && ((header.Flags & HeaderFlags.Unsynchronisation) != 0);
if (fullTagUnsynch)
{
SynchData.ResynchByteVector(data);
}
int frame_data_position = 0;
int frame_data_length = data.Count;
if ((header.Flags & HeaderFlags.ExtendedHeader) != 0)
{
extended_header = new ExtendedHeader(data, header.MajorVersion);
if (extended_header.Size <= data.Count)
{
frame_data_position += (int)extended_header.Size;
frame_data_length -= (int)extended_header.Size;
}
}
TextInformationFrame tdrc = null;
TextInformationFrame tyer = null;
TextInformationFrame tdat = null;
TextInformationFrame time = null;
while (frame_data_position < frame_data_length - FrameHeader.Size(header.MajorVersion))
{
if (data[frame_data_position] == 0)
{
break;
}
Frame frame = null;
try
{
frame = FrameFactory.CreateFrame(data, ref frame_data_position, header.MajorVersion, fullTagUnsynch);
}
catch (NotImplementedException)
{
continue;
}
catch (CorruptFileException)
{
continue;
}
if (frame == null)
{
break;
}
if (frame.Size == 0)
{
continue;
}
AddFrame(frame);
if (header.MajorVersion == 4)
{
continue;
}
if (tdrc == null && frame.FrameId.Equals(FrameType.TDRC))
{
tdrc = frame as TextInformationFrame;
}
else if (tyer == null && frame.FrameId.Equals(FrameType.TYER))
{
tyer = frame as TextInformationFrame;
}
else if (tdat == null && frame.FrameId.Equals(FrameType.TDAT))
{
tdat = frame as TextInformationFrame;
}
else if (time == null && frame.FrameId.Equals(FrameType.TIME))
{
time = frame as TextInformationFrame;
}
}
if (tdrc == null || tdat == null || tdrc.ToString().Length > 4)
{
return;
}
string year = tdrc.ToString();
if (year.Length != 4)
{
return;
}
StringBuilder tdrc_text = new StringBuilder();
tdrc_text.Append(year);
if (tdat != null)
{
string tdat_text = tdat.ToString();
if (tdat_text.Length == 4)
{
tdrc_text.Append("-").Append(tdat_text, 0, 2).Append("-").Append(tdat_text, 2, 2);
if (time != null)
{
string time_text = time.ToString();
if (time_text.Length == 4)
{
tdrc_text.Append("T").Append(time_text, 0, 2).Append(":").Append(time_text, 2, 2);
}
RemoveFrames(FrameType.TIME);
}
}
RemoveFrames(FrameType.TDAT);
}
tdrc.Text = new string[]
{
tdrc_text.ToString()
};
}
