1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
3 /* This Source Code Form is subject to the terms of the Mozilla Public
4 * License, v. 2.0. If a copy of the MPL was not distributed with this
5 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
6
7 #include "mozilla/dom/EncodingUtils.h"
8
9 #include "mozilla/ArrayUtils.h" // ArrayLength
10 #include "nsUConvPropertySearch.h"
11 #include "nsIUnicodeDecoder.h"
12 #include "nsIUnicodeEncoder.h"
13 #include "nsComponentManagerUtils.h"
14
15 namespace mozilla {
16 namespace dom {
17
18 static const nsUConvProp labelsEncodings[] = {
19 #include "labelsencodings.properties.h"
20 };
21
22 static const nsUConvProp encodingsGroups[] = {
23 #include "encodingsgroups.properties.h"
24 };
25
26 bool
FindEncodingForLabel(const nsACString & aLabel,nsACString & aOutEncoding)27 EncodingUtils::FindEncodingForLabel(const nsACString& aLabel,
28 nsACString& aOutEncoding)
29 {
30 // Save aLabel first because it may refer the same string as aOutEncoding.
31 nsCString label(aLabel);
32
33 EncodingUtils::TrimSpaceCharacters(label);
34 if (label.IsEmpty()) {
35 aOutEncoding.Truncate();
36 return false;
37 }
38
39 ToLowerCase(label);
40 return NS_SUCCEEDED(nsUConvPropertySearch::SearchPropertyValue(
41 labelsEncodings, ArrayLength(labelsEncodings), label, aOutEncoding));
42 }
43
44 bool
FindEncodingForLabelNoReplacement(const nsACString & aLabel,nsACString & aOutEncoding)45 EncodingUtils::FindEncodingForLabelNoReplacement(const nsACString& aLabel,
46 nsACString& aOutEncoding)
47 {
48 if(!FindEncodingForLabel(aLabel, aOutEncoding)) {
49 return false;
50 }
51 if (aOutEncoding.EqualsLiteral("replacement")) {
52 aOutEncoding.Truncate();
53 return false;
54 }
55 return true;
56 }
57
58 bool
IsAsciiCompatible(const nsACString & aPreferredName)59 EncodingUtils::IsAsciiCompatible(const nsACString& aPreferredName)
60 {
61 // HZ and UTF-7 are no longer in mozilla-central, but keeping them here
62 // just in case for the benefit of comm-central.
63 return !(aPreferredName.LowerCaseEqualsLiteral("utf-16") ||
64 aPreferredName.LowerCaseEqualsLiteral("utf-16be") ||
65 aPreferredName.LowerCaseEqualsLiteral("utf-16le") ||
66 aPreferredName.LowerCaseEqualsLiteral("replacement") ||
67 aPreferredName.LowerCaseEqualsLiteral("hz-gb-2312") ||
68 aPreferredName.LowerCaseEqualsLiteral("utf-7") ||
69 aPreferredName.LowerCaseEqualsLiteral("x-imap4-modified-utf7"));
70 }
71
72 already_AddRefed<nsIUnicodeDecoder>
DecoderForEncoding(const nsACString & aEncoding)73 EncodingUtils::DecoderForEncoding(const nsACString& aEncoding)
74 {
75 nsAutoCString contractId(NS_UNICODEDECODER_CONTRACTID_BASE);
76 contractId.Append(aEncoding);
77
78 nsCOMPtr<nsIUnicodeDecoder> decoder = do_CreateInstance(contractId.get());
79 MOZ_ASSERT(decoder, "Tried to create decoder for unknown encoding.");
80 return decoder.forget();
81 }
82
83 already_AddRefed<nsIUnicodeEncoder>
EncoderForEncoding(const nsACString & aEncoding)84 EncodingUtils::EncoderForEncoding(const nsACString& aEncoding)
85 {
86 nsAutoCString contractId(NS_UNICODEENCODER_CONTRACTID_BASE);
87 contractId.Append(aEncoding);
88
89 nsCOMPtr<nsIUnicodeEncoder> encoder = do_CreateInstance(contractId.get());
90 MOZ_ASSERT(encoder, "Tried to create encoder for unknown encoding.");
91 return encoder.forget();
92 }
93
94 void
LangGroupForEncoding(const nsACString & aEncoding,nsACString & aOutGroup)95 EncodingUtils::LangGroupForEncoding(const nsACString& aEncoding,
96 nsACString& aOutGroup)
97 {
98 if (NS_FAILED(nsUConvPropertySearch::SearchPropertyValue(
99 encodingsGroups, ArrayLength(encodingsGroups), aEncoding, aOutGroup))) {
100 aOutGroup.AssignLiteral("x-unicode");
101 }
102 }
103
104 } // namespace dom
105 } // namespace mozilla
106