func serializeVorbisTagPictureField(cover Cover) []byte {
result := make([]byte, cover.Size()+128)
size := 0
// cover type
// TODO care for cover type
utils.WriteInt32Be(3, result[0:4])
size += 4
// mime
utils.WriteInt32Be(len(cover.Mime), result[size:size+4])
copy(result[size+4:size+4+len(cover.Mime)], cover.Mime)
size += 4 + len(cover.Mime)
// description
utils.WriteInt32Be(len(cover.Description), result[size:size+4])
copy(result[size+4:size+4+len(cover.Description)], cover.Description)
size += 4 + len(cover.Description)
// width, height, colour depth, colours
for i := size; i < size+16; i++ {
result[i] = 0
}
size += 16
// image data
utils.WriteInt32Be(len(cover.Data), result[size:size+4])
copy(result[size+4:size+4+len(cover.Data)], cover.Data)
size += 4 + len(cover.Data)
return result[:size]
}
func (editor *Mp3TagEditor) serializeCover(cover Cover, frameId string, dst []byte, offset int) int {
if len(frameId) != id3v2FrameIdSize {
return offset
}
data := editor.coverToData(cover)
copy(dst[offset:], frameId)
utils.WriteInt32Be(len(data), dst[offset+4:offset+8])
dst[offset+8] = 0 // flag
dst[offset+9] = 0 // flag
copy(dst[offset+10:offset+10+len(data)], data)
return offset + 10 + len(data)
}
func (editor *Mp3TagEditor) serializeTextField(text, frameId string, dst []byte, offset int) int {
if len(frameId) != id3v2FrameIdSize {
return offset
}
utf16Text := utils.Utf8ToUtf16Le(text)
copy(dst[offset:], frameId)
utils.WriteInt32Be(len(utf16Text)+3, dst[offset+4:offset+8])
dst[offset+8] = 0 // flag
dst[offset+9] = 0 // flag
dst[offset+10] = 1 // text encoding
dst[offset+11] = 0xFF // UTF BOM
dst[offset+12] = 0xFE // UTF BOM
copy(dst[offset+13:offset+13+len(utf16Text)], utf16Text)
return offset + 13 + len(utf16Text)
}