183 lines
3.1 KiB
Go
183 lines
3.1 KiB
Go
package multiaddr
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import (
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"bytes"
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"fmt"
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"strings"
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)
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func stringToBytes(s string) ([]byte, error) {
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// consume trailing slashes
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s = strings.TrimRight(s, "/")
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b := new(bytes.Buffer)
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sp := strings.Split(s, "/")
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if sp[0] != "" {
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return nil, fmt.Errorf("invalid multiaddr, must begin with /")
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}
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// consume first empty elem
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sp = sp[1:]
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for len(sp) > 0 {
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p := ProtocolWithName(sp[0])
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if p.Code == 0 {
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return nil, fmt.Errorf("no protocol with name %s", sp[0])
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}
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b.Write(CodeToVarint(p.Code))
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sp = sp[1:]
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if p.Size == 0 { // no length.
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continue
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}
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if len(sp) < 1 {
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return nil, fmt.Errorf("protocol requires address, none given: %s", p.Name)
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}
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if p.Path {
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// it's a path protocol (terminal).
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// consume the rest of the address as the next component.
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sp = []string{"/" + strings.Join(sp, "/")}
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}
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if p.Transcoder == nil {
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return nil, fmt.Errorf("no transcoder for %s protocol", p.Name)
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}
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a, err := p.Transcoder.StringToBytes(sp[0])
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if err != nil {
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return nil, fmt.Errorf("failed to parse %s: %s %s", p.Name, sp[0], err)
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}
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b.Write(a)
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sp = sp[1:]
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}
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return b.Bytes(), nil
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}
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func validateBytes(b []byte) (err error) {
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for len(b) > 0 {
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code, n, err := ReadVarintCode(b)
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if err != nil {
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return err
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}
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b = b[n:]
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p := ProtocolWithCode(code)
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if p.Code == 0 {
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return fmt.Errorf("no protocol with code %d", code)
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}
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if p.Size == 0 {
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continue
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}
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size, err := sizeForAddr(p, b)
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if err != nil {
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return err
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}
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if len(b) < size || size < 0 {
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return fmt.Errorf("invalid value for size")
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}
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b = b[size:]
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}
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return nil
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}
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func bytesToString(b []byte) (ret string, err error) {
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s := ""
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for len(b) > 0 {
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code, n, err := ReadVarintCode(b)
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if err != nil {
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return "", err
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}
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b = b[n:]
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p := ProtocolWithCode(code)
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if p.Code == 0 {
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return "", fmt.Errorf("no protocol with code %d", code)
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}
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s += "/" + p.Name
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if p.Size == 0 {
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continue
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}
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size, err := sizeForAddr(p, b)
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if err != nil {
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return "", err
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}
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if len(b) < size || size < 0 {
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return "", fmt.Errorf("invalid value for size")
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}
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if p.Transcoder == nil {
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return "", fmt.Errorf("no transcoder for %s protocol", p.Name)
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}
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a, err := p.Transcoder.BytesToString(b[:size])
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if err != nil {
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return "", err
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}
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if len(a) > 0 {
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s += "/" + a
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}
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b = b[size:]
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}
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return s, nil
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}
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func sizeForAddr(p Protocol, b []byte) (int, error) {
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switch {
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case p.Size > 0:
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return (p.Size / 8), nil
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case p.Size == 0:
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return 0, nil
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case p.Path:
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size, n, err := ReadVarintCode(b)
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if err != nil {
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return 0, err
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}
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return size + n, nil
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default:
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size, n, err := ReadVarintCode(b)
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if err != nil {
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return 0, err
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}
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return size + n, nil
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}
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}
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func bytesSplit(b []byte) ([][]byte, error) {
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var ret [][]byte
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for len(b) > 0 {
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code, n, err := ReadVarintCode(b)
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if err != nil {
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return nil, err
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}
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p := ProtocolWithCode(code)
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if p.Code == 0 {
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return nil, fmt.Errorf("no protocol with code %d", b[0])
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}
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size, err := sizeForAddr(p, b[n:])
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if err != nil {
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return nil, err
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}
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length := n + size
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ret = append(ret, b[:length])
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b = b[length:]
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}
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return ret, nil
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}
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