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nsUCS2BEToUnicode.h
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00001 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
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00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is Mozilla Communicator client code.
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1998
00020  * the Initial Developer. All Rights Reserved.
00021  *
00022  * Contributor(s):
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
00025  * either of the GNU General Public License Version 2 or later (the "GPL"),
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00027  * in which case the provisions of the GPL or the LGPL are applicable instead
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00037 
00038 #ifndef nsUCS2BEToUnicode_h___
00039 #define nsUCS2BEToUnicode_h___
00040 
00041 #include "nsISupports.h"
00042 #include "nsUCSupport.h"
00043 
00044 // internal base class
00045 class nsUTF16ToUnicodeBase : public nsBasicDecoderSupport
00046 {
00047 protected:
00048   // ctor accessible only by child classes
00049   nsUTF16ToUnicodeBase() { Reset();};
00050 
00051 public: 
00052   //--------------------------------------------------------------------
00053   // Subclassing of nsDecoderSupport class [declaration]
00054 
00055   NS_IMETHOD GetMaxLength(const char * aSrc, PRInt32 aSrcLength, 
00056       PRInt32 * aDestLength);
00057   NS_IMETHOD Reset();
00058 
00059 protected:
00060   PRUint8 mState;
00061   PRUint8 mData;
00062 };
00063 
00064 // UTF-16 big endian
00065 class nsUTF16BEToUnicode : public nsUTF16ToUnicodeBase
00066 {
00067 public:
00068 
00069   NS_IMETHOD Convert(const char * aSrc, PRInt32 * aSrcLength,
00070       PRUnichar * aDest, PRInt32 * aDestLength); 
00071 };
00072 
00073 // UTF-16 little endian
00074 class nsUTF16LEToUnicode : public nsUTF16ToUnicodeBase
00075 {
00076 public:
00077 
00078   NS_IMETHOD Convert(const char * aSrc, PRInt32 * aSrcLength,
00079       PRUnichar * aDest, PRInt32 * aDestLength); 
00080 };
00081 
00082 // UTF-16 with BOM
00083 class nsUTF16ToUnicode : public nsUTF16ToUnicodeBase
00084 {
00085 public:
00086 
00087   NS_IMETHOD Convert(const char * aSrc, PRInt32 * aSrcLength,
00088       PRUnichar * aDest, PRInt32 * aDestLength); 
00089 
00090   NS_IMETHOD Reset();
00091 
00092 private:
00093 
00094   enum Endian {kUnknown, kBigEndian, kLittleEndian};
00095   Endian  mEndian; 
00096   PRBool  mFoundBOM;
00097 };
00098 
00099 #endif /* nsUCS2BEToUnicode_h___ */