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@ -5,6 +5,7 @@ import (
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"encoding/binary" |
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"fmt" |
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"io" |
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"os" |
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"strconv" |
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) |
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@ -18,7 +19,7 @@ type ID3v11Tags struct {
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Genre string |
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} |
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// Retrieves ID3v1.1 field values of provided io.ReadSeeker (usually a file)
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// Retrieves ID3v1.1 field values of provided io.ReadSeeker
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func GetID3v11Tags(rs io.ReadSeeker) (*ID3v11Tags, error) { |
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// set reader to the last 128 bytes
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_, err := rs.Seek(-int64(ID3V1SIZE), io.SeekEnd) |
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@ -106,7 +107,7 @@ func GetID3v11Tags(rs io.ReadSeeker) (*ID3v11Tags, error) {
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} |
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// Writes given ID3v1.1 tags to dst
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func WriteID3v11Tags(dst io.WriteSeeker, tags ID3v11Tags) error { |
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func WriteID3v11Tags(dst io.WriteSeeker, tags *ID3v11Tags) error { |
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dst.Seek(0, io.SeekEnd) |
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// TAG
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@ -175,3 +176,45 @@ func WriteID3v11Tags(dst io.WriteSeeker, tags ID3v11Tags) error {
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return nil |
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} |
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// Checks for existing ID3v1.1 tag in file, if present - removes it and replaces with provided tags
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func WriteID3v11ToFile(f *os.File, tags *ID3v11Tags) error { |
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defer f.Close() |
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// check for existing ID3v1.1 tag
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f.Seek(-int64(ID3V1SIZE), io.SeekEnd) |
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tag, err := read(f, 3) |
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if err != nil { |
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return err |
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} |
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if !bytes.Equal(tag, []byte("TAG")) { |
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// no existing tag, just write given tags
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err = WriteID3v11Tags(f, tags) |
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if err != nil { |
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return err |
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} |
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return nil |
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} |
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// does contain ID3v1.1 tag. Removing it
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fStats, err := f.Stat() |
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if err != nil { |
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return err |
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} |
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err = f.Truncate(fStats.Size() - int64(ID3V1SIZE)) |
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if err != nil { |
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return nil |
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} |
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// writing new tags
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err = WriteID3v11Tags(f, tags) |
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if err != nil { |
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return err |
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} |
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return nil |
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} |
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