66 lines
1.7 KiB
Go
66 lines
1.7 KiB
Go
package qmc
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import (
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"encoding/binary"
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"fmt"
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"io"
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)
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type qqMusicTagMusicEx struct {
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songid uint32 // Song ID
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unknown_1 uint32 // unused & unknown
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unknown_2 uint32 // unused & unknown
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mid string // Media ID
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mediafile string // real file name
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unknown_3 uint32 // unused; uninitialized memory?
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sizeof_struct uint32 // 19.57: fixed value: 0xC0
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version uint32 // 19.57: fixed value: 0x01
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tag_magic []byte // fixed value "musicex\0" (8 bytes)
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}
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func (tag *qqMusicTagMusicEx) Read(raw io.ReadSeeker) (int64, error) {
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_, err := raw.Seek(-16, io.SeekEnd)
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if err != nil {
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return 0, fmt.Errorf("musicex seek error: %w", err)
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}
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footerBuf := make([]byte, 4)
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footerBuf, err = io.ReadAll(io.LimitReader(raw, 4))
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if err != nil {
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return 0, fmt.Errorf("get musicex error: %w", err)
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}
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footerLen := int64(binary.LittleEndian.Uint32(footerBuf))
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audioLen, err := raw.Seek(-footerLen, io.SeekEnd)
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buf, err := io.ReadAll(io.LimitReader(raw, audioLen))
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if err != nil {
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return 0, err
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}
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tag.songid = binary.LittleEndian.Uint32(buf[0:4])
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tag.unknown_1 = binary.LittleEndian.Uint32(buf[4:8])
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tag.unknown_2 = binary.LittleEndian.Uint32(buf[8:12])
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for i := 0; i < 30; i++ {
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u := binary.LittleEndian.Uint16(buf[12+i*2 : 12+(i+1)*2])
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if u == 0 {
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break
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}
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tag.mid += string(u)
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}
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for i := 0; i < 50; i++ {
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u := binary.LittleEndian.Uint16(buf[72+i*2 : 72+(i+1)*2])
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if u == 0 {
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break
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}
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tag.mediafile += string(u)
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}
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tag.unknown_3 = binary.LittleEndian.Uint32(buf[173:177])
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tag.sizeof_struct = binary.LittleEndian.Uint32(buf[177:181])
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tag.version = binary.LittleEndian.Uint32(buf[181:185])
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tag.tag_magic = buf[185:193]
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return audioLen, nil
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}
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