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77 lines
2.4 KiB
C++
77 lines
2.4 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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NS_INLINE_DECL_REFCOUNTING(EncodingUtils)
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/**
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* Implements decode algorithm's step 1 & 2 from Encoding spec.
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* http://encoding.spec.whatwg.org/#decode
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*
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* @param aData, incoming byte stream of data.
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* @param aLength, incoming byte stream length.
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* @param aRetval, outgoing encoding corresponding to valid data
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* byte order mark.
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* @return offset after the BOM bytes in byte stream
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* where the actual data starts.
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*/
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static uint32_t IdentifyDataOffset(const char* aData,
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const uint32_t aLength,
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const char*& aRetval);
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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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*
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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 nsAString& aLabel,
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const char*& aOutEncoding);
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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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static void TrimSpaceCharacters(nsString& aString)
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{
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aString.Trim(" \t\n\f\r");
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}
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/* Called to free up Encoding instance. */
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static void Shutdown();
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protected:
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nsDataHashtable<nsStringHashKey, const char *> mLabelsEncodings;
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EncodingUtils();
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virtual ~EncodingUtils();
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static already_AddRefed<EncodingUtils> GetOrCreate();
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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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