651 lines
13 KiB
Go
651 lines
13 KiB
Go
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package bencode
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import (
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"bytes"
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"errors"
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"fmt"
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"io"
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"math/big"
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"reflect"
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"runtime"
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"strconv"
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"sync"
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)
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type Decoder struct {
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r interface {
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io.ByteScanner
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io.Reader
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}
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// Sum of bytes used to Decode values.
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Offset int64
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buf bytes.Buffer
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}
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func (d *Decoder) Decode(v interface{}) (err error) {
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defer func() {
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if err != nil {
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return
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}
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r := recover()
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_, ok := r.(runtime.Error)
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if ok {
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panic(r)
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}
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err, ok = r.(error)
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if !ok && r != nil {
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panic(r)
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}
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}()
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pv := reflect.ValueOf(v)
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if pv.Kind() != reflect.Ptr || pv.IsNil() {
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return &UnmarshalInvalidArgError{reflect.TypeOf(v)}
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}
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ok, err := d.parseValue(pv.Elem())
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if err != nil {
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return
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}
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if !ok {
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d.throwSyntaxError(d.Offset-1, errors.New("unexpected 'e'"))
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}
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return
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}
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func checkForUnexpectedEOF(err error, offset int64) {
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if err == io.EOF {
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panic(&SyntaxError{
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Offset: offset,
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What: io.ErrUnexpectedEOF,
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})
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}
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}
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func (d *Decoder) readByte() byte {
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b, err := d.r.ReadByte()
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if err != nil {
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checkForUnexpectedEOF(err, d.Offset)
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panic(err)
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}
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d.Offset++
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return b
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}
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// reads data writing it to 'd.buf' until 'sep' byte is encountered, 'sep' byte
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// is consumed, but not included into the 'd.buf'
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func (d *Decoder) readUntil(sep byte) {
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for {
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b := d.readByte()
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if b == sep {
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return
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}
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d.buf.WriteByte(b)
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}
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}
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func checkForIntParseError(err error, offset int64) {
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if err != nil {
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panic(&SyntaxError{
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Offset: offset,
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What: err,
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})
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}
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}
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func (d *Decoder) throwSyntaxError(offset int64, err error) {
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panic(&SyntaxError{
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Offset: offset,
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What: err,
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})
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}
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// called when 'i' was consumed
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func (d *Decoder) parseInt(v reflect.Value) {
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start := d.Offset - 1
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d.readUntil('e')
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if d.buf.Len() == 0 {
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panic(&SyntaxError{
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Offset: start,
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What: errors.New("empty integer value"),
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})
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}
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s := bytesAsString(d.buf.Bytes())
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switch v.Kind() {
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case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
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n, err := strconv.ParseInt(s, 10, 64)
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checkForIntParseError(err, start)
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if v.OverflowInt(n) {
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panic(&UnmarshalTypeError{
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Value: "integer " + s,
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Type: v.Type(),
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})
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}
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v.SetInt(n)
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case reflect.Uint, reflect.Uint8, reflect.Uint16, reflect.Uint32, reflect.Uint64:
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n, err := strconv.ParseUint(s, 10, 64)
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checkForIntParseError(err, start)
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if v.OverflowUint(n) {
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panic(&UnmarshalTypeError{
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Value: "integer " + s,
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Type: v.Type(),
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})
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}
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v.SetUint(n)
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case reflect.Bool:
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v.SetBool(s != "0")
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default:
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panic(&UnmarshalTypeError{
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Value: "integer " + s,
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Type: v.Type(),
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})
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}
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d.buf.Reset()
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}
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func (d *Decoder) parseString(v reflect.Value) error {
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start := d.Offset - 1
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// read the string length first
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d.readUntil(':')
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length, err := strconv.ParseInt(bytesAsString(d.buf.Bytes()), 10, 0)
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checkForIntParseError(err, start)
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defer d.buf.Reset()
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read := func(b []byte) {
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n, err := io.ReadFull(d.r, b)
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d.Offset += int64(n)
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if err != nil {
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checkForUnexpectedEOF(err, d.Offset)
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panic(&SyntaxError{
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Offset: d.Offset,
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What: errors.New("unexpected I/O error: " + err.Error()),
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})
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}
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}
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switch v.Kind() {
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case reflect.String:
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b := make([]byte, length)
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read(b)
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v.SetString(bytesAsString(b))
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return nil
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case reflect.Slice:
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if v.Type().Elem().Kind() != reflect.Uint8 {
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break
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}
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b := make([]byte, length)
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read(b)
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v.SetBytes(b)
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return nil
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case reflect.Array:
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if v.Type().Elem().Kind() != reflect.Uint8 {
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break
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}
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d.buf.Grow(int(length))
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b := d.buf.Bytes()[:length]
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read(b)
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reflect.Copy(v, reflect.ValueOf(b))
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return nil
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}
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d.buf.Grow(int(length))
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read(d.buf.Bytes()[:length])
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// I believe we return here to support "ignore_unmarshal_type_error".
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return &UnmarshalTypeError{
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Value: "string",
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Type: v.Type(),
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}
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}
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// Info for parsing a dict value.
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type dictField struct {
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Value reflect.Value // Storage for the parsed value.
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// True if field value should be parsed into Value. If false, the value
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// should be parsed and discarded.
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Ok bool
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Set func() // Call this after parsing into Value.
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IgnoreUnmarshalTypeError bool
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}
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// Returns specifics for parsing a dict field value.
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func getDictField(dict reflect.Value, key string) dictField {
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// get valuev as a map value or as a struct field
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switch dict.Kind() {
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case reflect.Map:
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value := reflect.New(dict.Type().Elem()).Elem()
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return dictField{
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Value: value,
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Ok: true,
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Set: func() {
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if dict.IsNil() {
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dict.Set(reflect.MakeMap(dict.Type()))
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}
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// Assigns the value into the map.
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dict.SetMapIndex(reflect.ValueOf(key).Convert(dict.Type().Key()), value)
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},
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}
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case reflect.Struct:
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sf, ok := getStructFieldForKey(dict.Type(), key)
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if !ok {
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return dictField{}
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}
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if sf.r.PkgPath != "" {
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panic(&UnmarshalFieldError{
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Key: key,
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Type: dict.Type(),
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Field: sf.r,
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})
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}
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return dictField{
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Value: dict.FieldByIndex(sf.r.Index),
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Ok: true,
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Set: func() {},
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IgnoreUnmarshalTypeError: sf.tag.IgnoreUnmarshalTypeError(),
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}
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default:
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return dictField{}
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}
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}
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type structField struct {
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r reflect.StructField
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tag tag
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}
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var (
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structFieldsMu sync.Mutex
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structFields = map[reflect.Type]map[string]structField{}
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)
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func parseStructFields(struct_ reflect.Type, each func(string, structField)) {
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for i, n := 0, struct_.NumField(); i < n; i++ {
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f := struct_.Field(i)
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if f.Anonymous {
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continue
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}
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tagStr := f.Tag.Get("bencode")
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if tagStr == "-" {
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continue
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}
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tag := parseTag(tagStr)
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key := tag.Key()
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if key == "" {
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key = f.Name
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}
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each(key, structField{f, tag})
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}
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}
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func saveStructFields(struct_ reflect.Type) {
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m := make(map[string]structField)
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parseStructFields(struct_, func(key string, sf structField) {
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m[key] = sf
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})
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structFields[struct_] = m
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}
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func getStructFieldForKey(struct_ reflect.Type, key string) (f structField, ok bool) {
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structFieldsMu.Lock()
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if _, ok := structFields[struct_]; !ok {
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saveStructFields(struct_)
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}
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f, ok = structFields[struct_][key]
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structFieldsMu.Unlock()
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return
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}
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func (d *Decoder) parseDict(v reflect.Value) error {
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// so, at this point 'd' byte was consumed, let's just read key/value
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// pairs one by one
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for {
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var keyStr string
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keyValue := reflect.ValueOf(&keyStr).Elem()
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ok, err := d.parseValue(keyValue)
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if err != nil {
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return fmt.Errorf("error parsing dict key: %s", err)
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}
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if !ok {
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return nil
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}
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df := getDictField(v, keyStr)
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// now we need to actually parse it
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if df.Ok {
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// log.Printf("parsing ok struct field for key %q", keyStr)
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ok, err = d.parseValue(df.Value)
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} else {
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// Discard the value, there's nowhere to put it.
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var if_ interface{}
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if_, ok = d.parseValueInterface()
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if if_ == nil {
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err = fmt.Errorf("error parsing value for key %q", keyStr)
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}
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}
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if err != nil {
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if _, ok := err.(*UnmarshalTypeError); !ok || !df.IgnoreUnmarshalTypeError {
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return fmt.Errorf("parsing value for key %q: %s", keyStr, err)
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}
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}
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if !ok {
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return fmt.Errorf("missing value for key %q", keyStr)
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}
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if df.Ok {
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df.Set()
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}
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}
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}
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func (d *Decoder) parseList(v reflect.Value) error {
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switch v.Kind() {
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case reflect.Array, reflect.Slice:
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default:
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panic(&UnmarshalTypeError{
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Value: "array",
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Type: v.Type(),
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})
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}
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i := 0
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for ; ; i++ {
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if v.Kind() == reflect.Slice && i >= v.Len() {
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v.Set(reflect.Append(v, reflect.Zero(v.Type().Elem())))
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}
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if i < v.Len() {
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ok, err := d.parseValue(v.Index(i))
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if err != nil {
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return err
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}
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if !ok {
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break
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}
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} else {
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_, ok := d.parseValueInterface()
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if !ok {
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break
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}
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}
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}
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if i < v.Len() {
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if v.Kind() == reflect.Array {
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z := reflect.Zero(v.Type().Elem())
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for n := v.Len(); i < n; i++ {
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v.Index(i).Set(z)
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}
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} else {
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v.SetLen(i)
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}
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}
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if i == 0 && v.Kind() == reflect.Slice {
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v.Set(reflect.MakeSlice(v.Type(), 0, 0))
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}
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return nil
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}
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func (d *Decoder) readOneValue() bool {
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b, err := d.r.ReadByte()
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if err != nil {
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panic(err)
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}
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if b == 'e' {
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d.r.UnreadByte()
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return false
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} else {
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d.Offset++
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d.buf.WriteByte(b)
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}
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switch b {
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case 'd', 'l':
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// read until there is nothing to read
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for d.readOneValue() {
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}
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// consume 'e' as well
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b = d.readByte()
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d.buf.WriteByte(b)
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case 'i':
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d.readUntil('e')
|
||
|
|
d.buf.WriteString("e")
|
||
|
|
default:
|
||
|
|
if b >= '0' && b <= '9' {
|
||
|
|
start := d.buf.Len() - 1
|
||
|
|
d.readUntil(':')
|
||
|
|
length, err := strconv.ParseInt(bytesAsString(d.buf.Bytes()[start:]), 10, 64)
|
||
|
|
checkForIntParseError(err, d.Offset-1)
|
||
|
|
|
||
|
|
d.buf.WriteString(":")
|
||
|
|
n, err := io.CopyN(&d.buf, d.r, length)
|
||
|
|
d.Offset += n
|
||
|
|
if err != nil {
|
||
|
|
checkForUnexpectedEOF(err, d.Offset)
|
||
|
|
panic(&SyntaxError{
|
||
|
|
Offset: d.Offset,
|
||
|
|
What: errors.New("unexpected I/O error: " + err.Error()),
|
||
|
|
})
|
||
|
|
}
|
||
|
|
break
|
||
|
|
}
|
||
|
|
|
||
|
|
d.raiseUnknownValueType(b, d.Offset-1)
|
||
|
|
}
|
||
|
|
|
||
|
|
return true
|
||
|
|
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *Decoder) parseUnmarshaler(v reflect.Value) bool {
|
||
|
|
if !v.Type().Implements(unmarshalerType) {
|
||
|
|
if v.Addr().Type().Implements(unmarshalerType) {
|
||
|
|
v = v.Addr()
|
||
|
|
} else {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
}
|
||
|
|
d.buf.Reset()
|
||
|
|
if !d.readOneValue() {
|
||
|
|
return false
|
||
|
|
}
|
||
|
|
m := v.Interface().(Unmarshaler)
|
||
|
|
err := m.UnmarshalBencode(d.buf.Bytes())
|
||
|
|
if err != nil {
|
||
|
|
panic(&UnmarshalerError{v.Type(), err})
|
||
|
|
}
|
||
|
|
return true
|
||
|
|
}
|
||
|
|
|
||
|
|
// Returns true if there was a value and it's now stored in 'v', otherwise
|
||
|
|
// there was an end symbol ("e") and no value was stored.
|
||
|
|
func (d *Decoder) parseValue(v reflect.Value) (bool, error) {
|
||
|
|
// we support one level of indirection at the moment
|
||
|
|
if v.Kind() == reflect.Ptr {
|
||
|
|
// if the pointer is nil, allocate a new element of the type it
|
||
|
|
// points to
|
||
|
|
if v.IsNil() {
|
||
|
|
v.Set(reflect.New(v.Type().Elem()))
|
||
|
|
}
|
||
|
|
v = v.Elem()
|
||
|
|
}
|
||
|
|
|
||
|
|
if d.parseUnmarshaler(v) {
|
||
|
|
return true, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
// common case: interface{}
|
||
|
|
if v.Kind() == reflect.Interface && v.NumMethod() == 0 {
|
||
|
|
iface, _ := d.parseValueInterface()
|
||
|
|
v.Set(reflect.ValueOf(iface))
|
||
|
|
return true, nil
|
||
|
|
}
|
||
|
|
|
||
|
|
b, err := d.r.ReadByte()
|
||
|
|
if err != nil {
|
||
|
|
panic(err)
|
||
|
|
}
|
||
|
|
d.Offset++
|
||
|
|
|
||
|
|
switch b {
|
||
|
|
case 'e':
|
||
|
|
return false, nil
|
||
|
|
case 'd':
|
||
|
|
return true, d.parseDict(v)
|
||
|
|
case 'l':
|
||
|
|
return true, d.parseList(v)
|
||
|
|
case 'i':
|
||
|
|
d.parseInt(v)
|
||
|
|
return true, nil
|
||
|
|
default:
|
||
|
|
if b >= '0' && b <= '9' {
|
||
|
|
// It's a string.
|
||
|
|
d.buf.Reset()
|
||
|
|
// Write the first digit of the length to the buffer.
|
||
|
|
d.buf.WriteByte(b)
|
||
|
|
return true, d.parseString(v)
|
||
|
|
}
|
||
|
|
|
||
|
|
d.raiseUnknownValueType(b, d.Offset-1)
|
||
|
|
}
|
||
|
|
panic("unreachable")
|
||
|
|
}
|
||
|
|
|
||
|
|
// An unknown bencode type character was encountered.
|
||
|
|
func (d *Decoder) raiseUnknownValueType(b byte, offset int64) {
|
||
|
|
panic(&SyntaxError{
|
||
|
|
Offset: offset,
|
||
|
|
What: fmt.Errorf("unknown value type %+q", b),
|
||
|
|
})
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *Decoder) parseValueInterface() (interface{}, bool) {
|
||
|
|
b, err := d.r.ReadByte()
|
||
|
|
if err != nil {
|
||
|
|
panic(err)
|
||
|
|
}
|
||
|
|
d.Offset++
|
||
|
|
|
||
|
|
switch b {
|
||
|
|
case 'e':
|
||
|
|
return nil, false
|
||
|
|
case 'd':
|
||
|
|
return d.parseDictInterface(), true
|
||
|
|
case 'l':
|
||
|
|
return d.parseListInterface(), true
|
||
|
|
case 'i':
|
||
|
|
return d.parseIntInterface(), true
|
||
|
|
default:
|
||
|
|
if b >= '0' && b <= '9' {
|
||
|
|
// string
|
||
|
|
// append first digit of the length to the buffer
|
||
|
|
d.buf.WriteByte(b)
|
||
|
|
return d.parseStringInterface(), true
|
||
|
|
}
|
||
|
|
|
||
|
|
d.raiseUnknownValueType(b, d.Offset-1)
|
||
|
|
panic("unreachable")
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *Decoder) parseIntInterface() (ret interface{}) {
|
||
|
|
start := d.Offset - 1
|
||
|
|
d.readUntil('e')
|
||
|
|
if d.buf.Len() == 0 {
|
||
|
|
panic(&SyntaxError{
|
||
|
|
Offset: start,
|
||
|
|
What: errors.New("empty integer value"),
|
||
|
|
})
|
||
|
|
}
|
||
|
|
|
||
|
|
n, err := strconv.ParseInt(d.buf.String(), 10, 64)
|
||
|
|
if ne, ok := err.(*strconv.NumError); ok && ne.Err == strconv.ErrRange {
|
||
|
|
i := new(big.Int)
|
||
|
|
_, ok := i.SetString(d.buf.String(), 10)
|
||
|
|
if !ok {
|
||
|
|
panic(&SyntaxError{
|
||
|
|
Offset: start,
|
||
|
|
What: errors.New("failed to parse integer"),
|
||
|
|
})
|
||
|
|
}
|
||
|
|
ret = i
|
||
|
|
} else {
|
||
|
|
checkForIntParseError(err, start)
|
||
|
|
ret = n
|
||
|
|
}
|
||
|
|
|
||
|
|
d.buf.Reset()
|
||
|
|
return
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *Decoder) parseStringInterface() interface{} {
|
||
|
|
start := d.Offset - 1
|
||
|
|
|
||
|
|
// read the string length first
|
||
|
|
d.readUntil(':')
|
||
|
|
length, err := strconv.ParseInt(d.buf.String(), 10, 64)
|
||
|
|
checkForIntParseError(err, start)
|
||
|
|
|
||
|
|
d.buf.Reset()
|
||
|
|
n, err := io.CopyN(&d.buf, d.r, length)
|
||
|
|
d.Offset += n
|
||
|
|
if err != nil {
|
||
|
|
checkForUnexpectedEOF(err, d.Offset)
|
||
|
|
panic(&SyntaxError{
|
||
|
|
Offset: d.Offset,
|
||
|
|
What: errors.New("unexpected I/O error: " + err.Error()),
|
||
|
|
})
|
||
|
|
}
|
||
|
|
|
||
|
|
s := d.buf.String()
|
||
|
|
d.buf.Reset()
|
||
|
|
return s
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *Decoder) parseDictInterface() interface{} {
|
||
|
|
dict := make(map[string]interface{})
|
||
|
|
for {
|
||
|
|
keyi, ok := d.parseValueInterface()
|
||
|
|
if !ok {
|
||
|
|
break
|
||
|
|
}
|
||
|
|
|
||
|
|
key, ok := keyi.(string)
|
||
|
|
if !ok {
|
||
|
|
panic(&SyntaxError{
|
||
|
|
Offset: d.Offset,
|
||
|
|
What: errors.New("non-string key in a dict"),
|
||
|
|
})
|
||
|
|
}
|
||
|
|
|
||
|
|
valuei, ok := d.parseValueInterface()
|
||
|
|
if !ok {
|
||
|
|
break
|
||
|
|
}
|
||
|
|
|
||
|
|
dict[key] = valuei
|
||
|
|
}
|
||
|
|
return dict
|
||
|
|
}
|
||
|
|
|
||
|
|
func (d *Decoder) parseListInterface() interface{} {
|
||
|
|
var list []interface{}
|
||
|
|
for {
|
||
|
|
valuei, ok := d.parseValueInterface()
|
||
|
|
if !ok {
|
||
|
|
break
|
||
|
|
}
|
||
|
|
|
||
|
|
list = append(list, valuei)
|
||
|
|
}
|
||
|
|
if list == nil {
|
||
|
|
list = make([]interface{}, 0, 0)
|
||
|
|
}
|
||
|
|
return list
|
||
|
|
}
|