The Tor Browser: dom/encoding/EncodingUtils.cpp@925c144e1f1f

     1 /* This Source Code Form is subject to the terms of the Mozilla Public

     2  * License, v. 2.0. If a copy of the MPL was not distributed with this

     3  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     5 #include "mozilla/dom/EncodingUtils.h"

     7 #include "mozilla/ArrayUtils.h" // ArrayLength

     8 #include "nsUConvPropertySearch.h"

     9 #include "nsIUnicodeDecoder.h"

    10 #include "nsIUnicodeEncoder.h"

    11 #include "nsComponentManagerUtils.h"

    13 namespace mozilla {

    14 namespace dom {

    16 static const char* labelsEncodings[][3] = {

    17 #include "labelsencodings.properties.h"

    18 };

    20 bool

    21 EncodingUtils::FindEncodingForLabel(const nsACString& aLabel,

    22                                     nsACString& aOutEncoding)

    23 {

    24   // Save aLabel first because it may refer the same string as aOutEncoding.

    25   nsCString label(aLabel);

    27   EncodingUtils::TrimSpaceCharacters(label);

    28   if (label.IsEmpty()) {

    29     aOutEncoding.Truncate();

    30     return false;

    31   }

    33   ToLowerCase(label);

    34   return NS_SUCCEEDED(nsUConvPropertySearch::SearchPropertyValue(

    35       labelsEncodings, ArrayLength(labelsEncodings), label, aOutEncoding));

    36 }

    38 bool

    39 EncodingUtils::IsAsciiCompatible(const nsACString& aPreferredName)

    40 {

    41   return !(aPreferredName.LowerCaseEqualsLiteral("utf-16") ||

    42            aPreferredName.LowerCaseEqualsLiteral("utf-16be") ||

    43            aPreferredName.LowerCaseEqualsLiteral("utf-16le") ||

    44            aPreferredName.LowerCaseEqualsLiteral("replacement") ||

    45            aPreferredName.LowerCaseEqualsLiteral("hz-gb-2312") ||

    46            aPreferredName.LowerCaseEqualsLiteral("utf-7") ||

    47            aPreferredName.LowerCaseEqualsLiteral("x-imap4-modified-utf7"));

    48 }

    50 already_AddRefed<nsIUnicodeDecoder>

    51 EncodingUtils::DecoderForEncoding(const nsACString& aEncoding)

    52 {

    53   nsAutoCString contractId(NS_UNICODEDECODER_CONTRACTID_BASE);

    54   contractId.Append(aEncoding);

    56   nsCOMPtr<nsIUnicodeDecoder> decoder = do_CreateInstance(contractId.get());

    57   MOZ_ASSERT(decoder, "Tried to create decoder for unknown encoding.");

    58   return decoder.forget();

    59 }

    61 already_AddRefed<nsIUnicodeEncoder>

    62 EncodingUtils::EncoderForEncoding(const nsACString& aEncoding)

    63 {

    64   nsAutoCString contractId(NS_UNICODEENCODER_CONTRACTID_BASE);

    65   contractId.Append(aEncoding);

    67   nsCOMPtr<nsIUnicodeEncoder> encoder = do_CreateInstance(contractId.get());

    68   MOZ_ASSERT(encoder, "Tried to create encoder for unknown encoding.");

    69   return encoder.forget();

    70 }

    72 } // namespace dom

    73 } // namespace mozilla

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