forgejo/vendor/github.com/go-asn1-ber/asn1-ber/header.go
6543 e374bb7e2d
[Vendor] Update go-ldap to v3.2.4 (#13163)
* [Vendor] update go-ldap to v3.0.3

* update go-ldap to v3.2.4

Co-authored-by: techknowlogick <techknowlogick@gitea.io>
2020-10-15 15:27:33 -04:00

38 lines
793 B
Go
Vendored

package ber
import (
"errors"
"fmt"
"io"
)
func readHeader(reader io.Reader) (identifier Identifier, length int, read int, err error) {
var (
c, l int
i Identifier
)
if i, c, err = readIdentifier(reader); err != nil {
return Identifier{}, 0, read, err
}
identifier = i
read += c
if l, c, err = readLength(reader); err != nil {
return Identifier{}, 0, read, err
}
length = l
read += c
// Validate length type with identifier (x.600, 8.1.3.2.a)
if length == LengthIndefinite && identifier.TagType == TypePrimitive {
return Identifier{}, 0, read, errors.New("indefinite length used with primitive type")
}
if length < LengthIndefinite {
err = fmt.Errorf("length cannot be less than %d", LengthIndefinite)
return
}
return identifier, length, read, nil
}