func (editor *FlacTagEditor) makeNewPictureBlock(cover Cover) []byte {
if cover.Empty() {
return nil
}
pictureData := serializeVorbisTagPictureField(cover)
typeData := make([]byte, 4)
typeData[0] = pictureBlockType
utils.WriteInt24Be(len(pictureData), typeData[1:4])
return append(typeData, pictureData...)
}
func (editor *FlacTagEditor) makeNewCommentBlock(tag Tag, existingCommentBlock []byte) []byte {
var vendorData []byte = nil
var unsupportedTagData []byte = nil
var unsupportedFields int = 0
if len(existingCommentBlock) >= 8 {
vendorSize := utils.ReadInt32Le(existingCommentBlock[4:8])
vendorData = existingCommentBlock[4 : 8+vendorSize]
unsupportedTagData, unsupportedFields = getUnsupportedVorbisTags(existingCommentBlock[8+vendorSize:])
}
newCommentData, totalFields := serializeVorbisTag(tag, unsupportedFields)
newCommentBlock := make([]byte, 4+len(vendorData)+4+len(newCommentData)+len(unsupportedTagData))
newCommentBlock[0] = commentBlockType
utils.WriteInt24Be(len(newCommentBlock)-4, newCommentBlock[1:4])
copy(newCommentBlock[4:], vendorData)
utils.WriteInt32Le(totalFields, newCommentBlock[4+len(vendorData):8+len(vendorData)])
copy(newCommentBlock[8+len(vendorData):], newCommentData)
copy(newCommentBlock[8+len(vendorData)+len(newCommentData):], unsupportedTagData)
return newCommentBlock
}