mirror of
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83 lines
2.3 KiB
C++
83 lines
2.3 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/dom/EncodingUtils.h"
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#include "nsUConvPropertySearch.h"
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namespace mozilla {
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namespace dom {
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static const char* labelsEncodings[][3] = {
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#include "labelsencodings.properties.h"
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};
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uint32_t
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EncodingUtils::IdentifyDataOffset(const char* aData,
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const uint32_t aLength,
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nsACString& aRetval)
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{
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// Truncating to pre-clear return value in case of failure.
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aRetval.Truncate();
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// Minimum bytes in input stream data that represents
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// the Byte Order Mark is 2. Max is 3.
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if (aLength < 2) {
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return 0;
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}
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if (aData[0] == '\xFF' && aData[1] == '\xFE') {
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aRetval.AssignLiteral("UTF-16LE");
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return 2;
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}
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if (aData[0] == '\xFE' && aData[1] == '\xFF') {
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aRetval.AssignLiteral("UTF-16BE");
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return 2;
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}
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// Checking utf-8 byte order mark.
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// Minimum bytes in input stream data that represents
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// the Byte Order Mark for utf-8 is 3.
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if (aLength < 3) {
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return 0;
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}
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if (aData[0] == '\xEF' && aData[1] == '\xBB' && aData[2] == '\xBF') {
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aRetval.AssignLiteral("UTF-8");
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return 3;
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}
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return 0;
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}
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bool
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EncodingUtils::FindEncodingForLabel(const nsACString& aLabel,
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nsACString& aOutEncoding)
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{
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// Save aLabel first because it may refer the same string as aOutEncoding.
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nsCString label(aLabel);
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EncodingUtils::TrimSpaceCharacters(label);
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if (label.IsEmpty()) {
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aOutEncoding.Truncate();
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return false;
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}
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ToLowerCase(label);
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return NS_SUCCEEDED(nsUConvPropertySearch::SearchPropertyValue(
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labelsEncodings, ArrayLength(labelsEncodings), label, aOutEncoding));
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}
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bool
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EncodingUtils::IsAsciiCompatible(const nsACString& aPreferredName)
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{
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return !(aPreferredName.LowerCaseEqualsLiteral("utf-16") ||
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aPreferredName.LowerCaseEqualsLiteral("utf-16be") ||
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aPreferredName.LowerCaseEqualsLiteral("utf-16le") ||
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aPreferredName.LowerCaseEqualsLiteral("utf-7") ||
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aPreferredName.LowerCaseEqualsLiteral("x-imap4-modified-utf7"));
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}
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} // namespace dom
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} // namespace mozilla
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