gecko/intl/uconv/ucvko/nsISO2022KRToUnicode.cpp

223 lines
7.0 KiB
C++

/* -*- Mode: C; tab-width: 4; 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.org 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):
* Jungshik Shin <jshin@mailaps.org>
*
* 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 "nsISO2022KRToUnicode.h"
#include "nsUCSupport.h"
#include "nsICharsetConverterManager.h"
#include "nsIServiceManager.h"
static NS_DEFINE_CID(kCharsetConverterManagerCID, NS_ICHARSETCONVERTERMANAGER_CID);
NS_IMETHODIMP nsISO2022KRToUnicode::Convert(const char * aSrc, PRInt32 * aSrcLen, PRUnichar * aDest, PRInt32 * aDestLen)
{
const unsigned char* srcEnd = (unsigned char*)aSrc + *aSrcLen;
const unsigned char* src =(unsigned char*) aSrc;
PRUnichar* destEnd = aDest + *aDestLen;
PRUnichar* dest = aDest;
while((src < srcEnd))
{
// if LF/CR, return to US-ASCII unconditionally.
if ( *src == 0x0a || *src == 0x0d )
mState = mState_Init;
switch(mState)
{
case mState_Init:
if(0x1b == *src) {
mLastLegalState = mState_ASCII;
mState = mState_ESC;
break;
}
mState = mState_ASCII;
// fall through
case mState_ASCII:
if(0x0e == *src) { // Shift-Out
mState = mState_KSX1001_1992;
mRunLength = 0;
}
else if(*src & 0x80) {
*dest++ = 0xFFFD;
if(dest >= destEnd)
goto error1;
}
else {
*dest++ = (PRUnichar) *src;
if(dest >= destEnd)
goto error1;
}
break;
case mState_ESC:
if('$' == *src) {
mState = mState_ESC_24;
}
else {
if((dest+2) >= destEnd)
goto error1;
*dest++ = (PRUnichar) 0x1b;
*dest++ = (0x80 & *src) ? 0xFFFD : (PRUnichar) *src;
mState = mLastLegalState;
}
break;
case mState_ESC_24: // ESC $
if(')' == *src) {
mState = mState_ESC_24_29;
}
else {
if((dest+3) >= destEnd)
goto error1;
*dest++ = (PRUnichar) 0x1b;
*dest++ = (PRUnichar) '$';
*dest++ = (0x80 & *src) ? 0xFFFD : (PRUnichar) *src;
mState = mLastLegalState;
}
break;
case mState_ESC_24_29: // ESC $ )
mState = mLastLegalState;
if('C' == *src) {
mState = mState_ASCII;
mRunLength = 0;
}
else {
if((dest+4) >= destEnd)
goto error1;
*dest++ = (PRUnichar) 0x1b;
*dest++ = (PRUnichar) '$';
*dest++ = (PRUnichar) ')';
*dest++ = (0x80 & *src) ? 0xFFFD : (PRUnichar) *src;
mState = mLastLegalState;
}
break;
case mState_KSX1001_1992:
if (0x20 < (PRUint8) *src && (PRUint8) *src < 0x7f) {
mData = (PRUint8) *src;
mState = mState_KSX1001_1992_2ndbyte;
}
else if (0x0f == *src) { // Shift-In (SI)
mState = mState_ASCII;
if (mRunLength == 0) {
if(dest+1 >= destEnd)
goto error1;
*dest++ = 0xFFFD;
}
mRunLength = 0;
}
else if ((PRUint8) *src == 0x20 || (PRUint8) *src == 0x09) {
// Allow space and tab between SO and SI (i.e. in Hangul segment)
mState = mState_KSX1001_1992;
*dest++ = (PRUnichar) *src;
++mRunLength;
if(dest >= destEnd)
goto error1;
}
else { // Everything else is invalid.
*dest++ = 0xFFFD;
if(dest >= destEnd)
goto error1;
}
break;
case mState_KSX1001_1992_2ndbyte:
if ( 0x20 < (PRUint8) *src && (PRUint8) *src < 0x7f ) {
if (!mEUCKRDecoder) {
// creating a delegate converter (EUC-KR)
nsresult rv;
nsCOMPtr<nsICharsetConverterManager> ccm =
do_GetService(kCharsetConverterManagerCID, &rv);
if (NS_SUCCEEDED(rv)) {
rv = ccm->GetUnicodeDecoderRaw("EUC-KR", &mEUCKRDecoder);
}
}
if (!mEUCKRDecoder) {// failed creating a delegate converter
*dest++ = 0xFFFD;
}
else {
unsigned char ksx[2];
PRUnichar uni;
PRInt32 ksxLen = 2, uniLen = 1;
// mData is the original 1st byte.
// *src is the present 2nd byte.
// Put 2 bytes (one character) to ksx[] with EUC-KR encoding.
ksx[0] = mData | 0x80;
ksx[1] = *src | 0x80;
// Convert EUC-KR to unicode.
mEUCKRDecoder->Convert((const char *)ksx, &ksxLen, &uni, &uniLen);
*dest++ = uni;
++mRunLength;
}
if(dest >= destEnd)
goto error1;
mState = mState_KSX1001_1992;
}
else { // Invalid
if ( 0x0f == *src ) { // Shift-In (SI)
mState = mState_ASCII;
}
else {
mState = mState_KSX1001_1992;
}
*dest++ = 0xFFFD;
if(dest >= destEnd)
goto error1;
}
break;
case mState_ERROR:
mState = mLastLegalState;
*dest++ = 0xFFFD;
if(dest >= destEnd)
goto error1;
break;
} // switch
src++;
}
*aDestLen = dest - aDest;
return NS_OK;
error1:
*aDestLen = dest-aDest;
*aSrcLen = src-(unsigned char*)aSrc;
return NS_OK_UDEC_MOREOUTPUT;
}