mirror of
https://github.com/wader/fq.git
synced 2024-11-27 06:04:47 +03:00
8e0dde03d0
This will allow passing both cli options and format options to sub decoder. Ex: pass keylog option to a tls decoder when decoding a pcap. Ex: pass decode options to a format inside a http body inside a pcap. Add ArgAs method to lookup argument based on type. This also makes the format decode function have same signature as sub decoders in the decode API. This change decode.Format a bit: DecodeFn is now just func(d *D) any DecodeInArg renamed to DefaultInArg
76 lines
1.8 KiB
Go
76 lines
1.8 KiB
Go
package ape
|
|
|
|
// http://wiki.hydrogenaud.io/index.php?title=APE_Tags_Header
|
|
|
|
import (
|
|
"github.com/wader/fq/format"
|
|
"github.com/wader/fq/pkg/decode"
|
|
"github.com/wader/fq/pkg/interp"
|
|
)
|
|
|
|
var imageFormat decode.Group
|
|
|
|
func init() {
|
|
interp.RegisterFormat(decode.Format{
|
|
Name: format.APEV2,
|
|
Description: "APEv2 metadata tag",
|
|
DecodeFn: apev2Decode,
|
|
Dependencies: []decode.Dependency{
|
|
{Names: []string{format.IMAGE}, Group: &imageFormat},
|
|
},
|
|
})
|
|
}
|
|
|
|
func apev2Decode(d *decode.D) any {
|
|
d.Endian = decode.LittleEndian
|
|
|
|
headerFooterFn := func(d *decode.D, name string) uint64 {
|
|
var tagCount uint64
|
|
d.FieldStruct(name, func(d *decode.D) {
|
|
d.FieldUTF8("preamble", 8, d.StrAssert("APETAGEX"))
|
|
d.FieldU32("version")
|
|
d.FieldU32("tag_size")
|
|
tagCount = d.FieldU32("item_count")
|
|
d.FieldU32("flags")
|
|
d.FieldRawLen("reserved", 64, d.BitBufIsZero())
|
|
})
|
|
return tagCount
|
|
}
|
|
|
|
tagCount := headerFooterFn(d, "header")
|
|
if tagCount > 1000 {
|
|
d.Fatalf("too many tags %d", tagCount)
|
|
}
|
|
|
|
d.FieldArray("tags", func(d *decode.D) {
|
|
for i := uint64(0); i < tagCount; i++ {
|
|
d.FieldStruct("tag", func(d *decode.D) {
|
|
itemSize := d.FieldU32("item_size")
|
|
var binaryItem bool
|
|
d.FieldStruct("item_flags", func(d *decode.D) {
|
|
d.FieldU6("unused0")
|
|
binaryItem = d.FieldBool("binary")
|
|
d.FieldU25("unused1")
|
|
})
|
|
keyLen := d.PeekFindByte(0, -1)
|
|
d.FieldUTF8("key", int(keyLen))
|
|
d.FieldU8("key_terminator")
|
|
if binaryItem {
|
|
d.FramedFn(int64(itemSize)*8, func(d *decode.D) {
|
|
d.FieldUTF8Null("filename")
|
|
// assume image if binary
|
|
d.FieldFormatOrRaw("value", imageFormat, nil)
|
|
})
|
|
} else {
|
|
d.FieldUTF8("value", int(itemSize))
|
|
}
|
|
})
|
|
}
|
|
})
|
|
|
|
// TODO: check footer flag
|
|
headerFooterFn(d, "footer")
|
|
|
|
return nil
|
|
}
|