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60 lines
1.3 KiB
Go
60 lines
1.3 KiB
Go
package httpsfv
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import (
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"encoding/base64"
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"errors"
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"strings"
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)
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// ErrInvalidBinaryFormat is returned when the binary format is invalid.
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var ErrInvalidBinaryFormat = errors.New("invalid binary format")
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// marshalBinary serializes as defined in
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// https://httpwg.org/specs/rfc9651.html#ser-binary.
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func marshalBinary(b *strings.Builder, bs []byte) error {
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if err := b.WriteByte(':'); err != nil {
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return err
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}
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buf := make([]byte, base64.StdEncoding.EncodedLen(len(bs)))
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base64.StdEncoding.Encode(buf, bs)
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if _, err := b.Write(buf); err != nil {
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return err
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}
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return b.WriteByte(':')
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}
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// parseBinary parses as defined in
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// https://httpwg.org/specs/rfc9651.html#parse-binary.
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func parseBinary(s *scanner) ([]byte, error) {
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if s.eof() || s.data[s.off] != ':' {
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return nil, &UnmarshalError{s.off, ErrInvalidBinaryFormat}
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}
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s.off++
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start := s.off
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for !s.eof() {
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c := s.data[s.off]
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if c == ':' {
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// base64decode
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decoded, err := base64.StdEncoding.DecodeString(s.data[start:s.off])
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if err != nil {
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return nil, &UnmarshalError{s.off, err}
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}
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s.off++
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return decoded, nil
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}
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if !isAlpha(c) && !isDigit(c) && c != '+' && c != '/' && c != '=' {
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return nil, &UnmarshalError{s.off, ErrInvalidBinaryFormat}
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}
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s.off++
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}
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return nil, &UnmarshalError{s.off, ErrInvalidBinaryFormat}
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}
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