forked from dustin/go-id3
/
id3v22.go
64 lines (59 loc) · 1.62 KB
/
id3v22.go
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// Copyright 2011 Andrew Scherkus
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package id3
import (
"bufio"
"fmt"
)
// ID3 v2.2 uses 24-bit big endian frame sizes.
func parseID3v22FrameSize(reader *bufio.Reader) (int, error) {
size, err := readBytes(reader, 3)
if err != nil {
return -1, err
}
return int(size[0])<<16 | int(size[1])<<8 | int(size[2]), nil
}
func parseID3v22File(reader *bufio.Reader) (*File, error) {
file := new(File)
for hasFrame(reader, 3) {
b, err := readBytes(reader, 3)
if err != nil {
return nil, fmt.Errorf("parseID3v22File: %s", err)
}
id := string(b)
size, err := parseID3v22FrameSize(reader)
if err != nil {
return nil, err
}
switch id {
case "TAL":
file.Album = readString(reader, size)
case "TRK":
file.Track = readString(reader, size)
case "TP1":
file.Artist = readString(reader, size)
case "TT2":
file.Name = readString(reader, size)
case "TYE":
file.Year = readString(reader, size)
case "TPA":
file.Disc = readString(reader, size)
case "TCO":
file.Genre = readGenre(reader, size)
default:
skipBytes(reader, size)
}
}
return file, nil
}