gecko/intl/uconv/util/nsUnicodeEncodeHelper.cpp

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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 ***** */
#include "pratom.h"
#include "unicpriv.h"
#include "nsIUnicodeEncoder.h"
#include "nsUnicodeEncodeHelper.h"
//----------------------------------------------------------------------
// Class nsUnicodeEncodeHelper [implementation]
nsresult nsUnicodeEncodeHelper::ConvertByTable(
const PRUnichar * aSrc,
PRInt32 * aSrcLength,
char * aDest,
PRInt32 * aDestLength,
uScanClassID aScanClass,
uShiftOutTable * aShiftOutTable,
uMappingTable * aMappingTable)
{
const PRUnichar * src = aSrc;
const PRUnichar * srcEnd = aSrc + *aSrcLength;
char * dest = aDest;
PRInt32 destLen = *aDestLength;
PRUnichar med;
PRInt32 bcw; // byte count for write;
nsresult res = NS_OK;
while (src < srcEnd) {
if (!uMapCode((uTable*) aMappingTable, static_cast<PRUnichar>(*(src++)), reinterpret_cast<PRUint16*>(&med))) {
if (aScanClass == u1ByteCharset && *(src - 1) < 0x20) {
// some tables are missing the 0x00 - 0x20 part
med = *(src - 1);
} else {
res = NS_ERROR_UENC_NOMAPPING;
break;
}
}
PRBool charFound;
if (aScanClass == uMultibytesCharset) {
NS_ASSERTION(aShiftOutTable, "shift table missing");
charFound = uGenerateShift(aShiftOutTable, 0, med,
(PRUint8 *)dest, destLen,
(PRUint32 *)&bcw);
} else {
charFound = uGenerate(aScanClass, 0, med,
(PRUint8 *)dest, destLen,
(PRUint32 *)&bcw);
}
if (!charFound) {
src--;
res = NS_OK_UENC_MOREOUTPUT;
break;
}
dest += bcw;
destLen -= bcw;
}
*aSrcLength = src - aSrc;
*aDestLength = dest - aDest;
return res;
}
nsresult nsUnicodeEncodeHelper::ConvertByMultiTable(
const PRUnichar * aSrc,
PRInt32 * aSrcLength,
char * aDest,
PRInt32 * aDestLength,
PRInt32 aTableCount,
uScanClassID * aScanClassArray,
uShiftOutTable ** aShiftOutTable,
uMappingTable ** aMappingTable)
{
const PRUnichar * src = aSrc;
const PRUnichar * srcEnd = aSrc + *aSrcLength;
char * dest = aDest;
PRInt32 destLen = *aDestLength;
PRUnichar med;
PRInt32 bcw; // byte count for write;
nsresult res = NS_OK;
PRInt32 i;
while (src < srcEnd) {
for (i=0; i<aTableCount; i++)
if (uMapCode((uTable*) aMappingTable[i], static_cast<PRUint16>(*src), reinterpret_cast<PRUint16*>(&med))) break;
src++;
if (i == aTableCount) {
res = NS_ERROR_UENC_NOMAPPING;
break;
}
PRBool charFound;
if (aScanClassArray[i] == uMultibytesCharset) {
NS_ASSERTION(aShiftOutTable[i], "shift table missing");
charFound = uGenerateShift(aShiftOutTable[i], 0, med,
(PRUint8 *)dest, destLen,
(PRUint32 *)&bcw);
}
else
charFound = uGenerate(aScanClassArray[i], 0, med,
(PRUint8 *)dest, destLen,
(PRUint32 *)&bcw);
if (!charFound) {
src--;
res = NS_OK_UENC_MOREOUTPUT;
break;
}
dest += bcw;
destLen -= bcw;
}
*aSrcLength = src - aSrc;
*aDestLength = dest - aDest;
return res;
}