charset: re-enable hz-gb-2312

The upstream Go issue has been fixed [1].

[1]: golang/go#35118

References: #95

Author: emersion

charset/charset.go

@@ -18,12 +18,12 @@ import (
 
 // Quirks table for charsets not handled by ianaindex
 //
+// A nil entry disables the charset.
+//
 // For aliases, see
 // https://www.iana.org/assignments/character-sets/character-sets.xhtml
 var charsets = map[string]encoding.Encoding{
 	"ansi_x3.110-1983": charmap.ISO8859_1, // see RFC 1345 page 62, mostly superset of ISO 8859-1
-	// disabled due to https://github.com/emersion/go-message/issues/95
-	"hz-gb-2312": nil,
 }
 
 func init() {

charset/charset_test.go

@@ -79,13 +79,10 @@ func TestCharsetReader(t *testing.T) {
 }
 
 func TestDisabledCharsetReader(t *testing.T) {
-	_, err := Reader("hz-gb-2312", strings.NewReader("Some dummy text"))
+	charsets["DISABLED"] = nil
+
+	_, err := Reader("DISABLED", strings.NewReader("Some dummy text"))
 	if err == nil {
-		t.Errorf("%v encoding is disabled and should give an error", "hz-gb-2312")
-		return
-	}
-	if !strings.HasSuffix(err.Error(), "charset is disabled") {
-		t.Errorf("expected error to end in 'charset is disabled', got %v",
-			err.Error())
+		t.Errorf("Reader(): expected disabled charset to return an error")
 	}
 }

go.mod

@@ -7,5 +7,5 @@ require (
 	github.com/emersion/go-textwrapper v0.0.0-20200911093747-65d896831594
 	github.com/martinlindhe/base36 v1.1.0
 	github.com/stretchr/testify v1.3.0 // indirect
-	golang.org/x/text v0.3.4-0.20201021145329-22f1617af38e
+	golang.org/x/text v0.3.5-0.20201125200606-c27b9fd57aec
 )

go.sum

@@ -11,8 +11,6 @@ github.com/pmezard/go-difflib v1.0.0/go.mod h1:iKH77koFhYxTK1pcRnkKkqfTogsbg7gZN
 github.com/stretchr/objx v0.1.0/go.mod h1:HFkY916IF+rwdDfMAkV7OtwuqBVzrE8GR6GFx+wExME=
 github.com/stretchr/testify v1.3.0 h1:TivCn/peBQ7UY8ooIcPgZFpTNSz0Q2U6UrFlUfqbe0Q=
 github.com/stretchr/testify v1.3.0/go.mod h1:M5WIy9Dh21IEIfnGCwXGc5bZfKNJtfHm1UVUgZn+9EI=
-golang.org/x/text v0.3.3 h1:cokOdA+Jmi5PJGXLlLllQSgYigAEfHXJAERHVMaCc2k=
-golang.org/x/text v0.3.3/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
-golang.org/x/text v0.3.4-0.20201021145329-22f1617af38e h1:0kyKOEC0chG7FKmnf/1uNwvDLc3NtNTRip2rXAN9nwI=
-golang.org/x/text v0.3.4-0.20201021145329-22f1617af38e/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/text v0.3.5-0.20201125200606-c27b9fd57aec h1:A1qYjneJuzBZZ2gIB8rd6zrfq6l7SoEMJ8EsSilNK/U=
+golang.org/x/text v0.3.5-0.20201125200606-c27b9fd57aec/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
 golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=