mirror of
https://github.com/wader/fq.git
synced 2024-11-29 23:27:12 +03:00
161 lines
6.3 KiB
Go
161 lines
6.3 KiB
Go
package msgpack
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// https://github.com/msgpack/msgpack/blob/master/spec.md
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// TODO: ext types done correctly?
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import (
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"embed"
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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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//go:embed msgpack.jq
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//go:embed msgpack.md
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var msgPackFS embed.FS
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func init() {
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interp.RegisterFormat(decode.Format{
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Name: format.MSGPACK,
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Description: "MessagePack",
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DecodeFn: decodeMsgPack,
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Functions: []string{"torepr"},
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})
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interp.RegisterFS(msgPackFS)
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}
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type formatEntry struct {
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r [2]byte
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s scalar.Uint
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d func(d *decode.D)
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}
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type formatEntries []formatEntry
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func (fes formatEntries) lookup(u byte) (formatEntry, bool) {
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for _, fe := range fes {
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if u >= fe.r[0] && u <= fe.r[1] {
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return fe, true
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}
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}
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return formatEntry{}, false
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}
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func (fes formatEntries) MapUint(s scalar.Uint) (scalar.Uint, error) {
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u := s.Actual
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if fe, ok := fes.lookup(byte(u)); ok {
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s = fe.s
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s.Actual = u
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}
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return s, nil
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}
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func decodeMsgPackValue(d *decode.D) {
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arrayFn := func(seekBits int64, lengthBits int) func(d *decode.D) {
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return func(d *decode.D) {
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d.SeekRel(seekBits)
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length := d.FieldU("length", lengthBits)
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d.FieldArray("elements", func(d *decode.D) {
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for i := uint64(0); i < length; i++ {
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d.FieldStruct("element", decodeMsgPackValue)
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}
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})
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}
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}
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mapFn := func(seekBits int64, lengthBits int) func(d *decode.D) {
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return func(d *decode.D) {
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d.SeekRel(seekBits)
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length := d.FieldU("length", lengthBits)
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d.FieldArray("pairs", func(d *decode.D) {
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for i := uint64(0); i < length; i++ {
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d.FieldStruct("pair", func(d *decode.D) {
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d.FieldStruct("key", decodeMsgPackValue)
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d.FieldStruct("value", decodeMsgPackValue)
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})
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}
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})
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}
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}
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extFn := func(lengthBits int) func(d *decode.D) {
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return func(d *decode.D) {
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length := d.FieldU8("length")
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d.FieldS8("fixtype")
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d.FieldRawLen("value", int64(length)*8)
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}
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}
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// is defined here as a global map would cause a init dependency cycle
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formatMap := formatEntries{
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{r: [2]byte{0x00, 0x7f}, s: scalar.Uint{Sym: "positive_fixint"}, d: func(d *decode.D) {
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d.SeekRel(-8)
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d.FieldU8("value")
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}},
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{r: [2]byte{0x80, 0x8f}, s: scalar.Uint{Sym: "fixmap"}, d: mapFn(-4, 4)},
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{r: [2]byte{0x90, 0x9f}, s: scalar.Uint{Sym: "fixarray"}, d: arrayFn(-4, 4)},
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{r: [2]byte{0xa0, 0xbf}, s: scalar.Uint{Sym: "fixstr"}, d: func(d *decode.D) {
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d.SeekRel(-5)
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length := d.FieldU5("length")
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d.FieldUTF8("value", int(length))
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}},
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{r: [2]byte{0xc0, 0xc0}, s: scalar.Uint{Sym: "nil"}, d: func(d *decode.D) {
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d.FieldValueAny("value", nil)
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}},
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{r: [2]byte{0xc1, 0xc1}, s: scalar.Uint{Sym: "never_used"}, d: func(d *decode.D) {
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d.Fatalf("0xc1 never used")
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}},
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{r: [2]byte{0xc2, 0xc2}, s: scalar.Uint{Sym: "false"}, d: func(d *decode.D) {
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d.FieldValueBool("value", false)
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}},
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{r: [2]byte{0xc3, 0xc3}, s: scalar.Uint{Sym: "true"}, d: func(d *decode.D) {
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d.FieldValueBool("value", true)
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}},
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{r: [2]byte{0xc4, 0xc4}, s: scalar.Uint{Sym: "bin8"}, d: func(d *decode.D) { d.FieldRawLen("value", int64(d.FieldU8("length"))*8) }},
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{r: [2]byte{0xc5, 0xc5}, s: scalar.Uint{Sym: "bin16"}, d: func(d *decode.D) { d.FieldRawLen("value", int64(d.FieldU16("length"))*8) }},
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{r: [2]byte{0xc6, 0xc6}, s: scalar.Uint{Sym: "bin32"}, d: func(d *decode.D) { d.FieldRawLen("value", int64(d.FieldU32("length"))*8) }},
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{r: [2]byte{0xc7, 0xc7}, s: scalar.Uint{Sym: "ext8"}, d: extFn(8)},
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{r: [2]byte{0xc8, 0xc8}, s: scalar.Uint{Sym: "ext16"}, d: extFn(16)},
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{r: [2]byte{0xc9, 0xc9}, s: scalar.Uint{Sym: "ext32"}, d: extFn(32)},
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{r: [2]byte{0xca, 0xca}, s: scalar.Uint{Sym: "float32"}, d: func(d *decode.D) { d.FieldF32("value") }},
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{r: [2]byte{0xcb, 0xcb}, s: scalar.Uint{Sym: "float64"}, d: func(d *decode.D) { d.FieldF64("value") }},
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{r: [2]byte{0xcc, 0xcc}, s: scalar.Uint{Sym: "uint8"}, d: func(d *decode.D) { d.FieldU8("value") }},
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{r: [2]byte{0xcd, 0xcd}, s: scalar.Uint{Sym: "uint16"}, d: func(d *decode.D) { d.FieldU16("value") }},
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{r: [2]byte{0xce, 0xce}, s: scalar.Uint{Sym: "uint32"}, d: func(d *decode.D) { d.FieldU32("value") }},
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{r: [2]byte{0xcf, 0xcf}, s: scalar.Uint{Sym: "uint64"}, d: func(d *decode.D) { d.FieldU64("value") }},
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{r: [2]byte{0xd0, 0xd0}, s: scalar.Uint{Sym: "int8"}, d: func(d *decode.D) { d.FieldS8("value") }},
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{r: [2]byte{0xd1, 0xd1}, s: scalar.Uint{Sym: "int16"}, d: func(d *decode.D) { d.FieldS16("value") }},
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{r: [2]byte{0xd2, 0xd2}, s: scalar.Uint{Sym: "int32"}, d: func(d *decode.D) { d.FieldS32("value") }},
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{r: [2]byte{0xd3, 0xd3}, s: scalar.Uint{Sym: "int64"}, d: func(d *decode.D) { d.FieldS64("value") }},
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{r: [2]byte{0xd4, 0xd4}, s: scalar.Uint{Sym: "fixext1"}, d: func(d *decode.D) { d.FieldS8("fixtype"); d.FieldRawLen("value", 1*8) }},
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{r: [2]byte{0xd5, 0xd5}, s: scalar.Uint{Sym: "fixext2"}, d: func(d *decode.D) { d.FieldS8("fixtype"); d.FieldRawLen("value", 2*8) }},
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{r: [2]byte{0xd6, 0xd6}, s: scalar.Uint{Sym: "fixext4"}, d: func(d *decode.D) { d.FieldS8("fixtype"); d.FieldRawLen("value", 4*8) }},
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{r: [2]byte{0xd7, 0xd7}, s: scalar.Uint{Sym: "fixext8"}, d: func(d *decode.D) { d.FieldS8("fixtype"); d.FieldRawLen("value", 8*8) }},
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{r: [2]byte{0xd8, 0xd8}, s: scalar.Uint{Sym: "fixext16"}, d: func(d *decode.D) { d.FieldS8("fixtype"); d.FieldRawLen("value", 16*8) }},
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{r: [2]byte{0xd9, 0xd9}, s: scalar.Uint{Sym: "str8"}, d: func(d *decode.D) { d.FieldUTF8("value", int(d.FieldU8("length"))) }},
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{r: [2]byte{0xda, 0xda}, s: scalar.Uint{Sym: "str16"}, d: func(d *decode.D) { d.FieldUTF8("value", int(d.FieldU16("length"))) }},
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{r: [2]byte{0xdb, 0xdb}, s: scalar.Uint{Sym: "str32"}, d: func(d *decode.D) { d.FieldUTF8("value", int(d.FieldU32("length"))) }},
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{r: [2]byte{0xdc, 0xdc}, s: scalar.Uint{Sym: "array16"}, d: arrayFn(0, 16)},
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{r: [2]byte{0xdd, 0xdd}, s: scalar.Uint{Sym: "array32"}, d: arrayFn(0, 32)},
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{r: [2]byte{0xde, 0xde}, s: scalar.Uint{Sym: "map16"}, d: mapFn(0, 16)},
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{r: [2]byte{0xdf, 0xdf}, s: scalar.Uint{Sym: "map32"}, d: mapFn(0, 32)},
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{r: [2]byte{0xe0, 0xff}, s: scalar.Uint{Sym: "negative_fixint"}, d: func(d *decode.D) {
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d.SeekRel(-8)
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d.FieldS8("value")
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}},
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}
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typ := d.FieldU8("type", formatMap, scalar.UintHex)
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if fe, ok := formatMap.lookup(byte(typ)); ok {
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fe.d(d)
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} else {
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panic("unreachable")
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}
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}
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func decodeMsgPack(d *decode.D) any {
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decodeMsgPackValue(d)
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return nil
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}
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