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76 lines
1.9 KiB
Go
76 lines
1.9 KiB
Go
package ape
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// http://wiki.hydrogenaud.io/index.php?title=APE_Tags_Header
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import (
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"github.com/wader/fq/format"
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"github.com/wader/fq/format/registry"
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"github.com/wader/fq/pkg/decode"
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)
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var imageFormat []*decode.Format
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func init() {
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registry.MustRegister(&decode.Format{
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Name: format.APEV2,
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Description: "APEv2 metadata tag",
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DecodeFn: apev2Decode,
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Dependencies: []decode.Dependency{
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{Names: []string{format.IMAGE}, Formats: &imageFormat},
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},
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})
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}
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func apev2Decode(d *decode.D, in interface{}) interface{} {
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d.Endian = decode.LittleEndian
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headerFooterFn := func(d *decode.D, name string) uint64 {
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var tagCount uint64
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d.FieldStructFn(name, func(d *decode.D) {
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d.FieldValidateUTF8("preamble", "APETAGEX")
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d.FieldU32("version")
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d.FieldU32("tag_size")
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tagCount = d.FieldU32("item_count")
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d.FieldU32("flags")
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d.FieldValidateZeroPadding("reserved", 64)
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})
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return tagCount
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}
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tagCount := headerFooterFn(d, "header")
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d.FieldArrayFn("tags", func(d *decode.D) {
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for i := uint64(0); i < tagCount; i++ {
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d.FieldStructFn("tag", func(d *decode.D) {
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itemSize := d.FieldU32("item_size")
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var binaryItem bool
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d.FieldStructFn("item_flags", func(d *decode.D) {
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d.FieldU6("unused0")
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binaryItem = d.FieldBool("binary")
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d.FieldU25("unused1")
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})
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keyLen := d.PeekFindByte(0, -1)
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d.FieldUTF8("key", int(keyLen))
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d.FieldU8("key_terminator")
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if binaryItem {
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d.DecodeLenFn(int64(itemSize)*8, func(d *decode.D) {
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d.FieldStrNullTerminated("filename")
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// assume image if binary
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dv, _, _ := d.FieldTryFormat("value", imageFormat)
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if dv == nil {
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// TODO: framed and unknown instead?
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d.FieldBitBufLen("value", d.BitsLeft())
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}
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})
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} else {
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d.FieldUTF8("value", int(itemSize))
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}
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})
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}
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})
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// TODO: check footer flag
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headerFooterFn(d, "footer")
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return nil
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}
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