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73 lines
2.2 KiB
C++
73 lines
2.2 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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_dom_encodingutils_h_
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#define mozilla_dom_encodingutils_h_
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#include "nsDataHashtable.h"
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#include "nsString.h"
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namespace mozilla {
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namespace dom {
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class EncodingUtils
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{
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public:
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/**
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* Implements get an encoding algorithm from Encoding spec.
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* http://encoding.spec.whatwg.org/#concept-encoding-get
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* Given a label, this function returns the corresponding encoding or a
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* false.
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* The returned name may not be lowercased due to compatibility with
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* our internal implementations.
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*
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* @param aLabel, incoming label describing charset to be decoded.
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* @param aRetEncoding, returning corresponding encoding for label.
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* @return false if no encoding was found for label.
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* true if valid encoding found.
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*/
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static bool FindEncodingForLabel(const nsACString& aLabel,
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nsACString& aOutEncoding);
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static bool FindEncodingForLabel(const nsAString& aLabel,
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nsACString& aOutEncoding)
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{
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return FindEncodingForLabel(NS_ConvertUTF16toUTF8(aLabel), aOutEncoding);
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}
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/**
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* Remove any leading and trailing space characters, following the
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* definition of space characters from Encoding spec.
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* http://encoding.spec.whatwg.org/#terminology
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* Note that nsAString::StripWhitespace() doesn't exactly match the
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* definition. It also removes all matching chars in the string,
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* not just leading and trailing.
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*
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* @param aString, string to be trimmed.
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*/
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template<class T>
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static void TrimSpaceCharacters(T& aString)
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{
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aString.Trim(" \t\n\f\r");
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}
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/**
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* Check is the encoding is ASCII-compatible in the sense that Basic Latin
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* encodes to ASCII bytes. (The reverse may not be true!)
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*
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* @param aPreferredName a preferred encoding label
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* @return whether the encoding is ASCII-compatible
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*/
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static bool IsAsciiCompatible(const nsACString& aPreferredName);
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private:
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EncodingUtils() MOZ_DELETE;
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};
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} // dom
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} // mozilla
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#endif // mozilla_dom_encodingutils_h_
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