gecko/intl/uconv/ucvja/nsUnicodeToISO2022JP.cpp

212 lines
6.7 KiB
C++

/* -*- 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
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*
* 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):
*
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* 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
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#include "nsUnicodeToISO2022JP.h"
#include "nsIComponentManager.h"
#include "nsUCVJADll.h"
#include "nsUnicodeEncodeHelper.h"
//----------------------------------------------------------------------
// Global functions and data [declaration]
static const PRUint16 g_ufAsciiMapping [] = {
0x0001, 0x0004, 0x0005, 0x0008, 0x0000, 0x0000, 0x007F, 0x0000
};
#define SIZE_OF_TABLES 5
static const PRUint16 * g_ufMappingTables[SIZE_OF_TABLES] = {
g_ufAsciiMapping, // ASCII ISOREG 6
g_uf0201GLMapping, // JIS X 0201-1976 ISOREG 14
g_uf0208Mapping, // JIS X 0208-1983 ISOREG 87
g_uf0208extMapping, // JIS X 0208 - cp932 ext
g_uf0208Mapping, // JIS X 0208-1978 ISOREG 42
};
static const uScanClassID g_ufScanClassIDs[SIZE_OF_TABLES] = {
u1ByteCharset, // ASCII ISOREG 6
u1ByteCharset, // JIS X 0201-1976 ISOREG 14
u2BytesCharset, // JIS X 0208-1983 ISOREG 87
u2BytesCharset, // JIS X 0208- cp932 ext
u2BytesCharset, // JIS X 0208-1978 ISOREG 42
};
//----------------------------------------------------------------------
// Class nsUnicodeToISO2022JP [implementation]
// worst case max length:
// 1 2 3 4 5 6 7 8
// ESC $ B XX XX ESC ( B
nsUnicodeToISO2022JP::nsUnicodeToISO2022JP()
: nsEncoderSupport(8)
{
Reset();
}
nsUnicodeToISO2022JP::~nsUnicodeToISO2022JP()
{
}
nsresult nsUnicodeToISO2022JP::ChangeCharset(PRInt32 aCharset,
char * aDest,
PRInt32 * aDestLength)
{
// both 2 and 3 generate the same escape sequence. 2 is for
// the standard JISx0208 table, and 3 is for theCP932 extensions
// therefore, we treat them as the same one.
if(((2 == aCharset) && ( 3 == mCharset)) ||
((3 == aCharset) && ( 2 == mCharset)) )
{
mCharset = aCharset;
}
if(aCharset == mCharset)
{
*aDestLength = 0;
return NS_OK;
}
if (*aDestLength < 3) {
*aDestLength = 0;
return NS_OK_UENC_MOREOUTPUT;
}
switch (aCharset) {
case 0: // ASCII ISOREG 6
aDest[0] = 0x1b;
aDest[1] = '(';
aDest[2] = 'B';
break;
case 1: // JIS X 0201-1976 ("Roman" set) ISOREG 14
aDest[0] = 0x1b;
aDest[1] = '(';
aDest[2] = 'J';
break;
case 2: // JIS X 0208-1983 ISOREG 87
case 3: // JIS X 0208-1983
// we currently use this for CP932 ext
aDest[0] = 0x1b;
aDest[1] = '$';
aDest[2] = 'B';
break;
case 4: // JIS X 0201-1978 ISOREG 87-
// we currently do not have a diff mapping for it.
aDest[0] = 0x1b;
aDest[1] = '$';
aDest[2] = '@';
break;
}
mCharset = aCharset;
*aDestLength = 3;
return NS_OK;
}
//----------------------------------------------------------------------
// Subclassing of nsTableEncoderSupport class [implementation]
NS_IMETHODIMP nsUnicodeToISO2022JP::FillInfo(PRUint32* aInfo)
{
return nsUnicodeEncodeHelper::FillInfo(aInfo, SIZE_OF_TABLES,
(uMappingTable **) g_ufMappingTables);
}
NS_IMETHODIMP nsUnicodeToISO2022JP::ConvertNoBuffNoErr(
const PRUnichar * aSrc,
PRInt32 * aSrcLength,
char * aDest,
PRInt32 * aDestLength)
{
nsresult res = NS_OK;
const PRUnichar * src = aSrc;
const PRUnichar * srcEnd = aSrc + *aSrcLength;
char * dest = aDest;
char * destEnd = aDest + *aDestLength;
PRInt32 bcr, bcw;
PRInt32 i;
while (src < srcEnd) {
for (i=0; i< SIZE_OF_TABLES ; i++) {
bcr = 1;
bcw = destEnd - dest;
res = nsUnicodeEncodeHelper::ConvertByTable(src, &bcr, dest, &bcw,
g_ufScanClassIDs[i], nsnull,
(uMappingTable *) g_ufMappingTables[i]);
if (res != NS_ERROR_UENC_NOMAPPING) break;
}
if ( i>= SIZE_OF_TABLES) {
res = NS_ERROR_UENC_NOMAPPING;
src++;
}
if (res != NS_OK) break;
bcw = destEnd - dest;
res = ChangeCharset(i, dest, &bcw);
dest += bcw;
if (res != NS_OK) break;
bcr = srcEnd - src;
bcw = destEnd - dest;
res = nsUnicodeEncodeHelper::ConvertByTable(src, &bcr, dest, &bcw,
g_ufScanClassIDs[i], nsnull,
(uMappingTable *) g_ufMappingTables[i]);
src += bcr;
dest += bcw;
if ((res != NS_OK) && (res != NS_ERROR_UENC_NOMAPPING)) break;
if (res == NS_ERROR_UENC_NOMAPPING) src--;
}
*aSrcLength = src - aSrc;
*aDestLength = dest - aDest;
return res;
}
NS_IMETHODIMP nsUnicodeToISO2022JP::FinishNoBuff(char * aDest,
PRInt32 * aDestLength)
{
ChangeCharset(0, aDest, aDestLength);
return NS_OK;
}
NS_IMETHODIMP nsUnicodeToISO2022JP::Reset()
{
mCharset = 0;
return nsEncoderSupport::Reset();
}