//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");
}
}
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);
}
}