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gecko-dev/intl/uconv/public/nsIUnicodeEncoder.h

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