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encoding/asn1: document unmarshaling behavior for IMPLICIT string fields

Fixes #42570.

Change-Id: I73e339cdebe1720c141861a12e28a94cef13c75b
Reviewed-on: https://go-review.googlesource.com/c/go/+/269798
Reviewed-by: Katie Hockman <katie@golang.org>
Reviewed-by: Roland Shoemaker <roland@golang.org>
Run-TryBot: Katie Hockman <katie@golang.org>
Trust: Emmanuel Odeke <emmanuel@orijtech.com>
Trust: Katie Hockman <katie@golang.org>
This commit is contained in:
Eric Chiang 2020-11-12 19:13:02 -08:00 committed by Katie Hockman
parent 81ea89adf3
commit 665def2c11

View File

@ -1067,6 +1067,15 @@ func setDefaultValue(v reflect.Value, params fieldParameters) (ok bool) {
// set causes a SET, rather than a SEQUENCE type to be expected
// tag:x specifies the ASN.1 tag number; implies ASN.1 CONTEXT SPECIFIC
//
// When decoding an ASN.1 value with an IMPLICIT tag into a string field,
// Unmarshal will default to a PrintableString, which doesn't support
// characters such as '@' and '&'. To force other encodings, use the following
// tags:
//
// ia5 causes strings to be unmarshaled as ASN.1 IA5String values
// numeric causes strings to be unmarshaled as ASN.1 NumericString values
// utf8 causes strings to be unmarshaled as ASN.1 UTF8String values
//
// If the type of the first field of a structure is RawContent then the raw
// ASN1 contents of the struct will be stored in it.
//