VOL-2496 Add "event listen" command to voltctl
Change-Id: I8f1fb34b55f56c8125142ac289e2f19fc170d804
diff --git a/vendor/github.com/jcmturner/gofork/encoding/asn1/common.go b/vendor/github.com/jcmturner/gofork/encoding/asn1/common.go
new file mode 100644
index 0000000..7a9da49
--- /dev/null
+++ b/vendor/github.com/jcmturner/gofork/encoding/asn1/common.go
@@ -0,0 +1,173 @@
+// Copyright 2009 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package asn1
+
+import (
+ "reflect"
+ "strconv"
+ "strings"
+)
+
+// ASN.1 objects have metadata preceding them:
+// the tag: the type of the object
+// a flag denoting if this object is compound or not
+// the class type: the namespace of the tag
+// the length of the object, in bytes
+
+// Here are some standard tags and classes
+
+// ASN.1 tags represent the type of the following object.
+const (
+ TagBoolean = 1
+ TagInteger = 2
+ TagBitString = 3
+ TagOctetString = 4
+ TagOID = 6
+ TagEnum = 10
+ TagUTF8String = 12
+ TagSequence = 16
+ TagSet = 17
+ TagPrintableString = 19
+ TagT61String = 20
+ TagIA5String = 22
+ TagUTCTime = 23
+ TagGeneralizedTime = 24
+ TagGeneralString = 27
+)
+
+// ASN.1 class types represent the namespace of the tag.
+const (
+ ClassUniversal = 0
+ ClassApplication = 1
+ ClassContextSpecific = 2
+ ClassPrivate = 3
+)
+
+type tagAndLength struct {
+ class, tag, length int
+ isCompound bool
+}
+
+// ASN.1 has IMPLICIT and EXPLICIT tags, which can be translated as "instead
+// of" and "in addition to". When not specified, every primitive type has a
+// default tag in the UNIVERSAL class.
+//
+// For example: a BIT STRING is tagged [UNIVERSAL 3] by default (although ASN.1
+// doesn't actually have a UNIVERSAL keyword). However, by saying [IMPLICIT
+// CONTEXT-SPECIFIC 42], that means that the tag is replaced by another.
+//
+// On the other hand, if it said [EXPLICIT CONTEXT-SPECIFIC 10], then an
+// /additional/ tag would wrap the default tag. This explicit tag will have the
+// compound flag set.
+//
+// (This is used in order to remove ambiguity with optional elements.)
+//
+// You can layer EXPLICIT and IMPLICIT tags to an arbitrary depth, however we
+// don't support that here. We support a single layer of EXPLICIT or IMPLICIT
+// tagging with tag strings on the fields of a structure.
+
+// fieldParameters is the parsed representation of tag string from a structure field.
+type fieldParameters struct {
+ optional bool // true iff the field is OPTIONAL
+ explicit bool // true iff an EXPLICIT tag is in use.
+ application bool // true iff an APPLICATION tag is in use.
+ defaultValue *int64 // a default value for INTEGER typed fields (maybe nil).
+ tag *int // the EXPLICIT or IMPLICIT tag (maybe nil).
+ stringType int // the string tag to use when marshaling.
+ timeType int // the time tag to use when marshaling.
+ set bool // true iff this should be encoded as a SET
+ omitEmpty bool // true iff this should be omitted if empty when marshaling.
+
+ // Invariants:
+ // if explicit is set, tag is non-nil.
+}
+
+// Given a tag string with the format specified in the package comment,
+// parseFieldParameters will parse it into a fieldParameters structure,
+// ignoring unknown parts of the string.
+func parseFieldParameters(str string) (ret fieldParameters) {
+ for _, part := range strings.Split(str, ",") {
+ switch {
+ case part == "optional":
+ ret.optional = true
+ case part == "explicit":
+ ret.explicit = true
+ if ret.tag == nil {
+ ret.tag = new(int)
+ }
+ case part == "generalized":
+ ret.timeType = TagGeneralizedTime
+ case part == "utc":
+ ret.timeType = TagUTCTime
+ case part == "ia5":
+ ret.stringType = TagIA5String
+ // jtasn1 case below added
+ case part == "generalstring":
+ ret.stringType = TagGeneralString
+ case part == "printable":
+ ret.stringType = TagPrintableString
+ case part == "utf8":
+ ret.stringType = TagUTF8String
+ case strings.HasPrefix(part, "default:"):
+ i, err := strconv.ParseInt(part[8:], 10, 64)
+ if err == nil {
+ ret.defaultValue = new(int64)
+ *ret.defaultValue = i
+ }
+ case strings.HasPrefix(part, "tag:"):
+ i, err := strconv.Atoi(part[4:])
+ if err == nil {
+ ret.tag = new(int)
+ *ret.tag = i
+ }
+ case part == "set":
+ ret.set = true
+ case part == "application":
+ ret.application = true
+ if ret.tag == nil {
+ ret.tag = new(int)
+ }
+ case part == "omitempty":
+ ret.omitEmpty = true
+ }
+ }
+ return
+}
+
+// Given a reflected Go type, getUniversalType returns the default tag number
+// and expected compound flag.
+func getUniversalType(t reflect.Type) (tagNumber int, isCompound, ok bool) {
+ switch t {
+ case objectIdentifierType:
+ return TagOID, false, true
+ case bitStringType:
+ return TagBitString, false, true
+ case timeType:
+ return TagUTCTime, false, true
+ case enumeratedType:
+ return TagEnum, false, true
+ case bigIntType:
+ return TagInteger, false, true
+ }
+ switch t.Kind() {
+ case reflect.Bool:
+ return TagBoolean, false, true
+ case reflect.Int, reflect.Int8, reflect.Int16, reflect.Int32, reflect.Int64:
+ return TagInteger, false, true
+ case reflect.Struct:
+ return TagSequence, true, true
+ case reflect.Slice:
+ if t.Elem().Kind() == reflect.Uint8 {
+ return TagOctetString, false, true
+ }
+ if strings.HasSuffix(t.Name(), "SET") {
+ return TagSet, true, true
+ }
+ return TagSequence, true, true
+ case reflect.String:
+ return TagPrintableString, false, true
+ }
+ return 0, false, false
+}