michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef nsUTF16ToUnicode_h_
michael@0: #define nsUTF16ToUnicode_h_
michael@0: 
michael@0: #include "nsISupports.h"
michael@0: #include "nsUCSupport.h"
michael@0: 
michael@0: // internal base class
michael@0: class nsUTF16ToUnicodeBase : public nsBasicDecoderSupport
michael@0: {
michael@0: protected:
michael@0:   // ctor accessible only by child classes
michael@0:   nsUTF16ToUnicodeBase() { Reset();}
michael@0: 
michael@0:   nsresult UTF16ConvertToUnicode(const char * aSrc,
michael@0:                                  int32_t * aSrcLength, char16_t * aDest,
michael@0:                                  int32_t * aDestLength, bool aSwapBytes);
michael@0: 
michael@0: public: 
michael@0:   //--------------------------------------------------------------------
michael@0:   // Subclassing of nsDecoderSupport class [declaration]
michael@0: 
michael@0:   NS_IMETHOD GetMaxLength(const char * aSrc, int32_t aSrcLength, 
michael@0:       int32_t * aDestLength);
michael@0:   NS_IMETHOD Reset();
michael@0: 
michael@0: protected:
michael@0:   uint8_t mState;
michael@0:   // to store an odd byte left over between runs
michael@0:   uint8_t mOddByte;
michael@0:   // to store an odd high surrogate left over between runs
michael@0:   char16_t mOddHighSurrogate;
michael@0:   // to store an odd low surrogate left over between runs
michael@0:   char16_t mOddLowSurrogate;
michael@0: };
michael@0: 
michael@0: // UTF-16 big endian
michael@0: class nsUTF16BEToUnicode : public nsUTF16ToUnicodeBase
michael@0: {
michael@0: public:
michael@0: 
michael@0:   NS_IMETHOD Convert(const char * aSrc, int32_t * aSrcLength,
michael@0:       char16_t * aDest, int32_t * aDestLength); 
michael@0: };
michael@0: 
michael@0: // UTF-16 little endian
michael@0: class nsUTF16LEToUnicode : public nsUTF16ToUnicodeBase
michael@0: {
michael@0: public:
michael@0: 
michael@0:   NS_IMETHOD Convert(const char * aSrc, int32_t * aSrcLength,
michael@0:       char16_t * aDest, int32_t * aDestLength); 
michael@0: };
michael@0: 
michael@0: // UTF-16 with BOM
michael@0: class nsUTF16ToUnicode : public nsUTF16ToUnicodeBase
michael@0: {
michael@0: public:
michael@0: 
michael@0:   nsUTF16ToUnicode() { Reset();}
michael@0:   NS_IMETHOD Convert(const char * aSrc, int32_t * aSrcLength,
michael@0:       char16_t * aDest, int32_t * aDestLength); 
michael@0: 
michael@0:   NS_IMETHOD Reset();
michael@0: 
michael@0: private:
michael@0: 
michael@0:   enum Endian {kUnknown, kBigEndian, kLittleEndian};
michael@0:   Endian  mEndian; 
michael@0:   bool    mFoundBOM;
michael@0: };
michael@0: 
michael@0: #endif /* nsUTF16ToUnicode_h_ */