mirror of
https://github.com/wader/fq.git
synced 2024-11-27 06:04:47 +03:00
469 lines
10 KiB
Go
469 lines
10 KiB
Go
package decode
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// TODO: d.Pos check err
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// TODO: fn for actual?
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// TODO: dsl import .? own scalar package?
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// TODO: better IOError op names
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import (
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"bytes"
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"errors"
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"fmt"
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"math"
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"strings"
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"github.com/wader/fq/pkg/bitio"
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"github.com/wader/fq/pkg/ranges"
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"golang.org/x/text/encoding"
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"golang.org/x/text/encoding/unicode"
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)
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//go:generate sh -c "cat scalar_gen.go.tmpl | go run ../../dev/tmpl.go scalar_gen.go.json | gofmt > scalar_gen.go"
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type ScalarFn func(Scalar) (Scalar, error)
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func (d *D) Bin(s Scalar) (Scalar, error) { s.DisplayFormat = NumberBinary; return s, nil }
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func (d *D) Oct(s Scalar) (Scalar, error) { s.DisplayFormat = NumberOctal; return s, nil }
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func (d *D) Dec(s Scalar) (Scalar, error) { s.DisplayFormat = NumberDecimal; return s, nil }
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func (d *D) Hex(s Scalar) (Scalar, error) { s.DisplayFormat = NumberHex; return s, nil }
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func (d *D) Actual(a interface{}) func(s Scalar) (Scalar, error) {
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return func(s Scalar) (Scalar, error) { s.Actual = a; return s, nil }
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}
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func (d *D) Sym(sym interface{}) func(s Scalar) (Scalar, error) {
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return func(s Scalar) (Scalar, error) { s.Sym = sym; return s, nil }
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}
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func (d *D) Description(desc string) func(s Scalar) (Scalar, error) {
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return func(s Scalar) (Scalar, error) { s.Description = desc; return s, nil }
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}
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func (d *D) UAdd(n int) func(s Scalar) (Scalar, error) {
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return func(s Scalar) (Scalar, error) {
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if v, ok := s.Actual.(uint64); ok {
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// TODO: use math.Add/Sub?
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s.Actual = uint64(int64(v) + int64(n))
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}
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return s, nil
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}
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}
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// TODO: nicer api?
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func (d *D) Trim(cutset string) func(s Scalar) (Scalar, error) {
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return func(s Scalar) (Scalar, error) {
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if v, ok := s.Actual.(string); ok {
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s.Actual = strings.Trim(v, cutset)
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}
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return s, nil
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}
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}
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func (d *D) TrimSpace(s Scalar) (Scalar, error) {
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if v, ok := s.Actual.(string); ok {
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s.Actual = strings.TrimSpace(v)
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}
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return s, nil
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}
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func (d *D) RawSym(s Scalar, nBytes int, fn func(b []byte) string) (Scalar, error) {
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bb, ok := s.Actual.(*bitio.Buffer)
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if !ok {
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return s, nil
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}
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bbLen := bb.Len()
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if nBytes < 0 {
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nBytes = int(bbLen) / 8
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if bbLen%8 != 0 {
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nBytes++
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}
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}
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if bbLen < int64(nBytes)*8 {
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return s, nil
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}
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b := d.SharedReadBuf(nBytes)
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if _, err := bb.ReadBitsAt(b, nBytes*8, 0); err != nil {
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return s, err
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}
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s.Sym = fn(b[0:nBytes])
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return s, nil
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}
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func (d *D) RawUUID(s Scalar) (Scalar, error) {
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const uuidLen = 16
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return d.RawSym(s, uuidLen, func(b []byte) string {
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return fmt.Sprintf("%x-%x-%x-%x-%x", b[0:4], b[4:6], b[6:8], b[8:10], b[10:])
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})
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}
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func (d *D) RawHex(s Scalar) (Scalar, error) {
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return d.RawSym(s, -1, func(b []byte) string { return fmt.Sprintf("%x", b) })
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}
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func (d *D) RawHexReverse(s Scalar) (Scalar, error) {
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return d.RawSym(s, -1, func(b []byte) string {
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return fmt.Sprintf("%x", bitio.ReverseBytes(append([]byte{}, b...)))
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})
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}
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func (d *D) MapURangeToScalar(rm map[[2]uint64]Scalar) func(s Scalar) (Scalar, error) {
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return func(s Scalar) (Scalar, error) {
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n, ok := s.Actual.(uint64)
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if !ok {
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return s, nil
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}
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for r, rs := range rm {
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if n >= r[0] && n <= r[1] {
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ns := rs
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ns.Actual = s.Actual
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s = ns
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break
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}
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}
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return s, nil
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}
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}
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func (d *D) MapSRangeToScalar(rm map[[2]int64]Scalar) func(s Scalar) (Scalar, error) {
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return func(s Scalar) (Scalar, error) {
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n, ok := s.Actual.(int64)
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if !ok {
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return s, nil
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}
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for r, rs := range rm {
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if n >= r[0] && n <= r[1] {
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ns := rs
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ns.Actual = s.Actual
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s = ns
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break
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}
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}
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return s, nil
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}
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}
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type BytesToScalar []struct {
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Bytes []byte
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Scalar Scalar
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}
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func (d *D) MapRawToScalar(btss BytesToScalar) func(s Scalar) (Scalar, error) {
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return func(s Scalar) (Scalar, error) {
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// TODO: check type assert?
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ab, err := s.Actual.(*bitio.Buffer).Bytes()
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if err != nil {
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return s, err
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}
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for _, bs := range btss {
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if bytes.Equal(ab, bs.Bytes) {
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ns := bs.Scalar
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ns.Actual = s.Actual
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break
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}
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}
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return s, nil
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}
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}
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func (d *D) bitBufIsZero(s Scalar, err bool) (Scalar, error) {
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bb, ok := s.Actual.(*bitio.Buffer)
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if !ok {
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return s, nil
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}
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isZero := true
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b := d.SharedReadBuf(32 * 1024)
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bLen := len(b) * 8
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bbLeft := int(bb.Len())
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bbPos := int64(0)
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for bbLeft > 0 {
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rl := bbLeft
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if bbLeft > bLen {
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rl = bLen
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}
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// zero last byte if uneven read
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if rl%8 != 0 {
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b[rl/8] = 0
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}
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n, err := bitio.ReadAtFull(bb, b, rl, bbPos)
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if err != nil {
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return s, err
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}
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nb := int(bitio.BitsByteCount(int64(n)))
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for i := 0; i < nb; i++ {
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if b[i] != 0 {
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isZero = false
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break
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}
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}
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bbLeft -= n
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}
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if isZero {
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s.Description = "all zero"
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} else {
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s.Description = "all not zero"
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if err {
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return s, errors.New("validate is zero failed")
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}
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}
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return s, nil
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}
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func (d *D) BitBufIsZero(s Scalar) (Scalar, error) {
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return d.bitBufIsZero(s, false)
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}
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func (d *D) BitBufValidateIsZero(s Scalar) (Scalar, error) {
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return d.bitBufIsZero(s, true)
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}
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// TODO: generate?
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func (d *D) assertBitBuf(assert bool, bss ...[]byte) func(s Scalar) (Scalar, error) {
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return func(s Scalar) (Scalar, error) {
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ab, err := s.ActualBitBuf().Bytes()
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if err != nil {
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return s, err
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}
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for _, bs := range bss {
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if bytes.Equal(ab, bs) {
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s.Description = "valid"
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return s, nil
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}
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}
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s.Description = "invalid"
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if assert && !d.Options.Force {
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return s, errors.New("failed to validate raw")
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}
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return s, nil
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}
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}
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func (d *D) AssertBitBuf(bss ...[]byte) func(s Scalar) (Scalar, error) {
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return d.assertBitBuf(true, bss...)
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}
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func (d *D) ValidateBitBuf(bss ...[]byte) func(s Scalar) (Scalar, error) {
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return d.assertBitBuf(false, bss...)
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}
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func (d *D) TryFieldValue(name string, fn func() (*Value, error)) (*Value, error) {
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start := d.Pos()
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v, err := fn()
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stop := d.Pos()
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v.Name = name
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v.RootBitBuf = d.bitBuf
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v.Range = ranges.Range{Start: start, Len: stop - start}
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if err != nil {
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return nil, err
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}
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d.AddChild(v)
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return v, err
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}
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func (d *D) FieldValue(name string, fn func() *Value) *Value {
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v, err := d.TryFieldValue(name, func() (*Value, error) { return fn(), nil })
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if err != nil {
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panic(err)
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}
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return v
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}
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// looks a bit weird to force at least one ScalarFn arg
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func (d *D) TryFieldScalar(name string, sfn ScalarFn, sfns ...ScalarFn) (Scalar, error) {
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v, err := d.TryFieldValue(name, func() (*Value, error) {
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s, err := sfn(Scalar{})
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if err != nil {
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return &Value{V: s}, err
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}
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for _, sfn := range sfns {
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s, err = sfn(s)
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if err != nil {
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return &Value{V: s}, err
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}
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}
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return &Value{V: s}, nil
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})
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if err != nil {
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return Scalar{}, err
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}
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return v.V.(Scalar), nil
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}
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func (d *D) FieldScalar(name string, sfn ScalarFn, sfns ...ScalarFn) Scalar {
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v, err := d.TryFieldScalar(name, sfn, sfns...)
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if err != nil {
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panic(err)
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}
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return v
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}
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func (d *D) tryUE(nBits int, endian Endian) (uint64, error) {
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n, err := d.bits(nBits)
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if err != nil {
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return 0, err
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}
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if endian == LittleEndian {
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n = bitio.Uint64ReverseBytes(nBits, n)
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}
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return n, nil
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}
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func (d *D) tryBitBuf(nBits int64) (*bitio.Buffer, error) {
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return d.bitBuf.BitBufLen(nBits)
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}
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func (d *D) trySE(nBits int, endian Endian) (int64, error) {
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n, err := d.bits(nBits)
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if err != nil {
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return 0, err
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}
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if nBits == 0 {
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return 0, nil
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}
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if endian == LittleEndian {
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n = bitio.Uint64ReverseBytes(nBits, n)
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}
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var s int64
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if n&(1<<(nBits-1)) > 0 {
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// two's complement
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s = -int64((^n & ((1 << nBits) - 1)) + 1)
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} else {
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s = int64(n)
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}
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return s, nil
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}
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func (d *D) tryFE(nBits int, endian Endian) (float64, error) {
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n, err := d.bits(nBits)
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if err != nil {
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return 0, err
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}
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if endian == LittleEndian {
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n = bitio.Uint64ReverseBytes(nBits, n)
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}
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switch nBits {
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case 32:
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return float64(math.Float32frombits(uint32(n))), nil
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case 64:
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return math.Float64frombits(n), nil
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default:
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return 0, fmt.Errorf("unsupported float size %d", nBits)
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}
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}
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func (d *D) tryFPE(nBits int, fBits int64, endian Endian) (float64, error) {
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n, err := d.bits(nBits)
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if err != nil {
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return 0, err
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}
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if endian == LittleEndian {
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n = bitio.Uint64ReverseBytes(nBits, n)
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}
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return float64(n) / float64(uint64(1<<fBits)), nil
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}
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var UTF8BOM = unicode.UTF8BOM
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var UTF16BOM = unicode.UTF16(unicode.LittleEndian, unicode.UseBOM)
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var UTF16BE = unicode.UTF16(unicode.BigEndian, unicode.IgnoreBOM)
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var UTF16LE = unicode.UTF16(unicode.LittleEndian, unicode.IgnoreBOM)
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func (d *D) tryText(nBytes int, e encoding.Encoding) (string, error) {
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bs, err := d.bitBuf.BytesLen(nBytes)
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if err != nil {
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return "", err
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}
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return e.NewDecoder().String(string(bs))
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}
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// read length prefixed text (ex pascal short string)
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// lBits length prefix
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// fixedBytes if != -1 read nBytes but trim to length
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func (d *D) tryTextLenPrefixed(lenBits int, fixedBytes int, e encoding.Encoding) (string, error) {
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p := d.Pos()
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l, err := d.bits(lenBits)
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if err != nil {
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return "", err
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}
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n := int(l)
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if fixedBytes != -1 {
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n = fixedBytes - 1
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// TODO: error?
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if l > uint64(n) {
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l = uint64(n)
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}
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}
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bs, err := d.bitBuf.BytesLen(n)
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if err != nil {
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d.SeekAbs(p)
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return "", err
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}
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return e.NewDecoder().String(string(bs[0:l]))
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}
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func (d *D) tryTextNull(nullBytes int, e encoding.Encoding) (string, error) {
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p := d.Pos()
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peekBits, _, err := d.TryPeekFind(nullBytes*8, 8, -1, func(v uint64) bool { return v == 0 })
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if err != nil {
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return "", err
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}
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n := (int(peekBits) / 8) + nullBytes
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bs, err := d.bitBuf.BytesLen(n)
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if err != nil {
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d.SeekAbs(p)
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return "", err
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}
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return e.NewDecoder().String(string(bs[0 : n-nullBytes]))
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}
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func (d *D) tryTextNullLen(fixedBytes int, e encoding.Encoding) (string, error) {
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bs, err := d.bitBuf.BytesLen(fixedBytes)
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if err != nil {
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return "", err
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}
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nullIndex := bytes.IndexByte(bs, 0)
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if nullIndex != -1 {
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bs = bs[:nullIndex]
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}
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return e.NewDecoder().String(string(bs))
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}
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// ov is what to treat as 1
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func (d *D) tryUnary(ov uint64) (uint64, error) {
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p := d.Pos()
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var n uint64
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for {
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b, err := d.bits(1)
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if err != nil {
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d.SeekAbs(p)
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return 0, err
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}
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if b != ov {
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break
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}
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n++
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}
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return n, nil
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}
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func (d *D) tryBool() (bool, error) {
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n, err := d.bits(1)
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if err != nil {
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return false, err
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}
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return n == 1, nil
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}
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