//http://id3.org/id3v2.4.0-structure
private void Parse4(Stream stream)
{
HeaderLength = ID3Utils.ReadInt32(stream, false);
byte[] flags = ID3Utils.Read(stream, 1);
Flags = (ID3v2ExtendedHeaderFlags)flags[0];
if ((Flags & ID3v2ExtendedHeaderFlags.CrcPresent) == ID3v2ExtendedHeaderFlags.CrcPresent)
{
CRC = ID3Utils.Read(stream, 5);
}
if ((Flags & ID3v2ExtendedHeaderFlags.Restrict) == ID3v2ExtendedHeaderFlags.Restrict)
{
//%ppqrrstt
TagSizeRestriction = (ID3v2TagSizeRestriction)(flags[0] & 0xC0); //p --> last 2 bit
TextEncodingRestriction = (ID3v2TextEncodingRestriction)(flags[0] & 0x20); //q
TextFieldSizeRestriction = (ID3v2TextFieldSizeRestriction)(flags[0] & 0x18); //r
ImageEncodingRestriction = (ID3v2ImageEncodingRestriction)(flags[0] & 0x4); //s
ImageSizeRestriction = (ID3v2ImageSizeRestriction)(flags[0] & 0x3); //t
}
if ((flags[0] & 0x8F) != 0)
{
throw new ID3Exception("Invalid Extendedheaderflags");
}
}
public Frame GetFrame(FrameHeader header, ID3Version version, Stream stream)
{
var frame = GetFrame(header.FrameID, version, header);
frame.DecodeContent(ID3Utils.Read(stream, header.FrameSize));
return(frame);
}
protected void Decode(byte[] content, int offset, int count, Encoding encoding, out int read)
{
if (content.Length == 0)
{
throw new ID3Exception("Contentlength is zero");
}
Text = ID3Utils.ReadString(content, 0, content.Length - 1, ID3Utils.Iso88591, out read);
}
public static ID3v2Header FromStream(Stream stream)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
if (!stream.CanRead)
{
throw new ArgumentException("stream not readable");
}
if (!stream.CanSeek)
{
throw new ArgumentException("stream not seekable");
}
BinaryReader reader = new BinaryReader(stream);
ID3v2Header header;
byte[] buffer = new byte[HeaderLength];
int read = stream.Read(buffer, 0, buffer.Length);
if (read < 10)
{
throw new EndOfStreamException();
}
if (buffer[0] == 0x49 && //I
buffer[1] == 0x44 && //D
buffer[2] == 0x33)
{
header = new ID3v2Header();
header.Version = (ID3Version)buffer[3];
header.RawVersion = new byte[] { buffer[3], buffer[4] };
header.Flags = (ID3v2HeaderFlags)buffer[5];
/*header.DataLength = buffer[6] * (1 << 21);
* header.DataLength += buffer[7] * (1 << 14);
* header.DataLength += buffer[8] * (1 << 7);
* header.DataLength += buffer[9];
*/
header.DataLength = ID3Utils.ReadInt32(buffer, 6, true);
return(header);
}
stream.Position -= read;
return(null);
}
private void Parse3(Stream stream)
{
HeaderLength = ID3Utils.ReadInt32(stream, false);
byte[] flags = ID3Utils.Read(stream, 2);
PaddingSize = ID3Utils.ReadInt32(stream, false);
if ((flags[0] & 0x7F) != 0 || flags[1] != 0)
{
throw new ID3Exception("Invalid ExtendedHeaderflags");
}
//Flags = (ID3v2ExtendedHeaderFlags)flags[0];
if ((flags[0] & 0x80) != 0)
{
Flags |= ID3v2ExtendedHeaderFlags.CrcPresent;
CRC = ID3Utils.Read(stream, 4);
}
}
private Image DecodeImage()
{
return(ID3Utils.DecodeImage(RawData, MimeType));
}
