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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
48 lines
1.1 KiB
Go
48 lines
1.1 KiB
Go
package mp4
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import (
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"github.com/wader/fq/format"
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"github.com/wader/fq/pkg/decode"
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"github.com/wader/fq/pkg/interp"
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"github.com/wader/fq/pkg/scalar"
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)
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func init() {
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interp.RegisterFormat(decode.Format{
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Name: format.PSSH_PLAYREADY,
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Description: "PlayReady PSSH",
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DecodeFn: playreadyPsshDecode,
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})
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}
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const (
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recordTypeRightsManagementHeader = 1
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recordTypeLicenseStore = 2
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)
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var recordTypeNames = scalar.UintMapSymStr{
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recordTypeRightsManagementHeader: "Rights management header",
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recordTypeLicenseStore: "License store",
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}
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func playreadyPsshDecode(d *decode.D) any {
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d.Endian = decode.LittleEndian
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d.FieldU32("size")
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count := d.FieldU16("count")
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i := uint64(0)
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d.FieldStructArrayLoop("records", "record", func() bool { return i < count }, func(d *decode.D) {
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recordType := d.FieldU16("type", recordTypeNames)
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recordLen := d.FieldU16("len")
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switch recordType {
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case recordTypeRightsManagementHeader, recordTypeLicenseStore:
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d.FieldUTF16LE("xml", int(recordLen))
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default:
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d.FieldRawLen("data", int64(recordLen)*8)
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}
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i++
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})
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return nil
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}
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