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226 lines
8.9 KiB
C++
226 lines
8.9 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is Mozilla Communicator client code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsIUnicodeEncoder_h___
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#define nsIUnicodeEncoder_h___
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#include "nscore.h"
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#include "nsError.h"
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#include "nsISupports.h"
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// Interface ID for our Unicode Encoder interface
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// {2B2CA3D0-A4C9-11d2-8AA1-00600811A836}
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#define NS_IUNICODEENCODER_IID \
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{ 0x2b2ca3d0, 0xa4c9, 0x11d2, \
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{ 0x8a, 0xa1, 0x0, 0x60, 0x8, 0x11, 0xa8, 0x36 }}
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// Interface ID for our Unicode Character Encoder interface
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// {299BCCD0-C6DF-11d2-8AA8-00600811A836}
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#define NS_IUNICHARENCODER_IID \
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{ 0x299bccd0, 0xc6df, 0x11d2, \
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{0x8a, 0xa8, 0x0, 0x60, 0x8, 0x11, 0xa8, 0x36 }}
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#define NS_OK_UENC_EXACTLENGTH \
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NS_ERROR_GENERATE_SUCCESS(NS_ERROR_MODULE_UCONV, 0x21)
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#define NS_OK_UENC_MOREOUTPUT \
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NS_ERROR_GENERATE_SUCCESS(NS_ERROR_MODULE_UCONV, 0x22)
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#define NS_ERROR_UENC_NOMAPPING \
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NS_ERROR_GENERATE_SUCCESS(NS_ERROR_MODULE_UCONV, 0x23)
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#define NS_OK_UENC_MOREINPUT \
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NS_ERROR_GENERATE_SUCCESS(NS_ERROR_MODULE_UCONV, 0x24)
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#define NS_UNICODEENCODER_CONTRACTID_BASE "@mozilla.org/intl/unicode/encoder;1?charset="
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/**
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* Interface which converts a single character from Unicode into a given
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* charset.
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*
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* @created 17/Feb/1999
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* @author Catalin Rotaru [CATA]
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*/
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class nsIUnicharEncoder : public nsISupports
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{
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_IUNICHARENCODER_IID)
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/**
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* Converts a character from Unicode to a Charset.
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*/
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NS_IMETHOD Convert(PRUnichar aChar, char * aDest, PRInt32 * aDestLength) = 0;
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(nsIUnicharEncoder, NS_IUNICHARENCODER_IID)
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//
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// Malloc an Encoder (unicode -> charset) buffer if the
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// result won't fit in the static buffer
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//
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// p = the buffer pointer (char*)
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// e = encoder (nsIUnicodeEncoder*)
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// s = string (PRUnichar*)
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// l = string length (PRInt32)
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// sb = static buffer (char[])
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// sbl = static buffer length (PRUint32)
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// al = actual buffer length (PRInt32)
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//
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#define ENCODER_BUFFER_ALLOC_IF_NEEDED(p,e,s,l,sb,sbl,al) \
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PR_BEGIN_MACRO \
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if (e \
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&& NS_SUCCEEDED((e)->GetMaxLength((s), (l), &(al)))\
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&& ((al) > (PRInt32)(sbl)) \
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&& (nsnull!=((p)=(char*)nsMemory::Alloc((al)+1))) \
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) { \
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} \
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else { \
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(p) = (char*)(sb); \
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(al) = (sbl); \
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} \
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PR_END_MACRO
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//
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// Free the Encoder buffer if it was allocated
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//
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#define ENCODER_BUFFER_FREE_IF_NEEDED(p,sb) \
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PR_BEGIN_MACRO \
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if ((p) != (char*)(sb)) \
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nsMemory::Free(p); \
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PR_END_MACRO
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/**
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* Interface for a Converter from Unicode into a Charset.
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*
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* @created 23/Nov/1998
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* @author Catalin Rotaru [CATA]
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*/
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class nsIUnicodeEncoder : public nsISupports
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{
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public:
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NS_DECLARE_STATIC_IID_ACCESSOR(NS_IUNICODEENCODER_IID)
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enum {
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kOnError_Signal, // on an error, stop and signal
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kOnError_CallBack, // on an error, call the error handler
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kOnError_Replace // on an error, replace with a different character
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};
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/**
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* Converts the data from Unicode to a Charset.
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*
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* About the byte ordering:
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* - The input stream is Unicode, having the byte order which is internal
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* for the machine on which the converter is running on.
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* - For output, if the converter cares (that depends of the charset, for
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* example a singlebyte will ignore the byte ordering) it should assume
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* network order. If necessary and requested, we can add a method
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* SetOutputByteOrder() so that the reverse order can be used, too. That
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* method would have as default the assumed network order.
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*
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* For the last converted char, even if there is not enough output
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* space, a partial output must be done until all available space will be
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* used. The rest of the output should be buffered until more space becomes
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* available. But this is not also true about the error handling method!!!
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* So be very, very careful...
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*
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* @param aSrc [IN] the source data buffer
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* @param aSrcLength [IN/OUT] the length of source data buffer; after
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* conversion will contain the number of Unicode
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* characters read
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* @param aDest [OUT] the destination data buffer
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* @param aDestLength [IN/OUT] the length of the destination data buffer;
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* after conversion will contain the number of bytes
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* written
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* @return NS_OK_UENC_MOREOUTPUT if only a partial conversion
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* was done; more output space is needed to continue
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* NS_OK_UENC_MOREINPUT if only a partial conversion
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* was done; more input is needed to continue. This can
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* occur when the last UTF-16 code point in the input is
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* the first of a surrogate pair.
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* NS_ERROR_UENC_NOMAPPING if character without mapping
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* was encountered and the behavior was set to "signal".
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*/
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NS_IMETHOD Convert(const PRUnichar * aSrc, PRInt32 * aSrcLength,
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char * aDest, PRInt32 * aDestLength) = 0;
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/**
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* Finishes the conversion. The converter has the possibility to write some
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* extra data and flush its final state.
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*
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* @param aDest [OUT] the destination data buffer
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* @param aDestLength [IN/OUT] the length of destination data buffer; after
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* conversion it will contain the number of bytes written
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* @return NS_OK_UENC_MOREOUTPUT if only a partial conversion
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* was done; more output space is needed to continue
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*/
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NS_IMETHOD Finish(char * aDest, PRInt32 * aDestLength) = 0;
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/**
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* Returns a quick estimation of the size of the buffer needed to hold the
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* converted data. Remember: this estimation is >= with the actual size of
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* the buffer needed. It will be computed for the "worst case"
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*
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* @param aSrc [IN] the source data buffer
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* @param aSrcLength [IN] the length of source data buffer
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* @param aDestLength [OUT] the needed size of the destination buffer
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* @return NS_OK_UENC_EXACTLENGTH if an exact length was computed
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* NS_OK if all we have is an approximation
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*/
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NS_IMETHOD GetMaxLength(const PRUnichar * aSrc, PRInt32 aSrcLength,
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PRInt32 * aDestLength) = 0;
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/**
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* Resets the charset converter so it may be recycled for a completely
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* different and urelated buffer of data.
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*/
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NS_IMETHOD Reset() = 0;
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/**
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* Specify what to do when a character cannot be mapped into the dest charset
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*
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* @param aOrder [IN] the behavior; taken from the enum
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*/
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NS_IMETHOD SetOutputErrorBehavior(PRInt32 aBehavior,
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nsIUnicharEncoder * aEncoder, PRUnichar aChar) = 0;
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};
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NS_DEFINE_STATIC_IID_ACCESSOR(nsIUnicodeEncoder, NS_IUNICODEENCODER_IID)
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#endif /* nsIUnicodeEncoder_h___ */
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