272 lines
8.0 KiB
C++
272 lines
8.0 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsUnicodeToISO2022JP.h"
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#include "nsUCVJADll.h"
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#include "nsUnicodeEncodeHelper.h"
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//----------------------------------------------------------------------
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// Global functions and data [declaration]
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// Basic mapping from Hankaku to Zenkaku
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// Nigori and Maru are taken care of outside this basic mapping
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static const char16_t gBasicMapping[0x40] =
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{
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// 0xff60
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0xff60,0x3002,0x300c,0x300d,0x3001,0x30fb,0x30f2,0x30a1,
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// 0xff68
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0x30a3,0x30a5,0x30a7,0x30a9,0x30e3,0x30e5,0x30e7,0x30c3,
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// 0xff70
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0x30fc,0x30a2,0x30a4,0x30a6,0x30a8,0x30aa,0x30ab,0x30ad,
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// 0xff78
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0x30af,0x30b1,0x30b3,0x30b5,0x30b7,0x30b9,0x30bb,0x30bd,
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// 0xff80
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0x30bf,0x30c1,0x30c4,0x30c6,0x30c8,0x30ca,0x30cb,0x30cc,
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// 0xff88
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0x30cd,0x30ce,0x30cf,0x30d2,0x30d5,0x30d8,0x30db,0x30de,
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// 0xff90
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0x30df,0x30e0,0x30e1,0x30e2,0x30e4,0x30e6,0x30e8,0x30e9,
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// 0xff98
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0x30ea,0x30eb,0x30ec,0x30ed,0x30ef,0x30f3,0x309b,0x309c
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};
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// Do we need to check for Nigori for the next unicode ?
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#define NEED_TO_CHECK_NIGORI(u) (((0xff76<=(u))&&((u)<=0xff84))||((0xff8a<=(u))&&((u)<=0xff8e)))
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// Do we need to check for Maru for the next unicode ?
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#define NEED_TO_CHECK_MARU(u) ((0xff8a<=(u))&&((u)<=0xff8e))
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// The unicode is in Katakana Hankaku block
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#define IS_HANKAKU(u) ((0xff61 <= (u)) && ((u) <= 0xff9f))
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#define IS_NIGORI(u) (0xff9e == (u))
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#define IS_MARU(u) (0xff9f == (u))
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#define NIGORI_MODIFIER 1
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#define MARU_MODIFIER 2
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static const uint16_t g_ufAsciiMapping [] = {
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0x0001, 0x0004, 0x0005, 0x0008, 0x0000, 0x0000, 0x007F, 0x0000
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};
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#define SIZE_OF_ISO2022JP_TABLES 5
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static const uint16_t * g_ufMappingTables[SIZE_OF_ISO2022JP_TABLES] = {
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g_ufAsciiMapping, // ASCII ISOREG 6
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g_uf0201GLMapping, // JIS X 0201-1976 ISOREG 14
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g_uf0208Mapping, // JIS X 0208-1983 ISOREG 87
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g_uf0208extMapping, // JIS X 0208 - cp932 ext
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g_uf0208Mapping, // JIS X 0208-1978 ISOREG 42
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};
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static const uScanClassID g_ufScanClassIDs[SIZE_OF_ISO2022JP_TABLES] = {
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u1ByteCharset, // ASCII ISOREG 6
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u1ByteCharset, // JIS X 0201-1976 ISOREG 14
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u2BytesCharset, // JIS X 0208-1983 ISOREG 87
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u2BytesCharset, // JIS X 0208- cp932 ext
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u2BytesCharset, // JIS X 0208-1978 ISOREG 42
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};
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#define JIS_X_208_INDEX 2
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//----------------------------------------------------------------------
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// Class nsUnicodeToISO2022JP [implementation]
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// worst case max length:
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// 1 2 3 4 5 6 7 8
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// ESC $ B XX XX ESC ( B
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nsUnicodeToISO2022JP::nsUnicodeToISO2022JP()
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: nsEncoderSupport(8)
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{
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Reset();
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}
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nsUnicodeToISO2022JP::~nsUnicodeToISO2022JP()
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{
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}
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nsresult nsUnicodeToISO2022JP::ChangeCharset(int32_t aCharset,
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char * aDest,
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int32_t * aDestLength)
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{
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// both 2 and 3 generate the same escape sequence. 2 is for
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// the standard JISx0208 table, and 3 is for theCP932 extensions
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// therefore, we treat them as the same one.
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if(((2 == aCharset) && ( 3 == mCharset)) ||
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((3 == aCharset) && ( 2 == mCharset)) )
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{
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mCharset = aCharset;
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}
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if(aCharset == mCharset)
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{
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*aDestLength = 0;
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return NS_OK;
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}
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if (*aDestLength < 3) {
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*aDestLength = 0;
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return NS_OK_UENC_MOREOUTPUT;
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}
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switch (aCharset) {
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case 0: // ASCII ISOREG 6
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aDest[0] = 0x1b;
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aDest[1] = '(';
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aDest[2] = 'B';
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break;
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case 1: // JIS X 0201-1976 ("Roman" set) ISOREG 14
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aDest[0] = 0x1b;
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aDest[1] = '(';
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aDest[2] = 'J';
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break;
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case 2: // JIS X 0208-1983 ISOREG 87
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case 3: // JIS X 0208-1983
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// we currently use this for CP932 ext
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aDest[0] = 0x1b;
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aDest[1] = '$';
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aDest[2] = 'B';
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break;
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case 4: // JIS X 0201-1978 ISOREG 87-
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// we currently do not have a diff mapping for it.
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aDest[0] = 0x1b;
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aDest[1] = '$';
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aDest[2] = '@';
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break;
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}
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mCharset = aCharset;
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*aDestLength = 3;
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return NS_OK;
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}
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nsresult nsUnicodeToISO2022JP::ConvertHankaku(const char16_t * aSrc,
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int32_t * aSrcLength,
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char * aDest,
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int32_t * aDestLength)
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{
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nsresult res = NS_OK;
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const char16_t * src = aSrc;
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const char16_t * srcEnd = aSrc + *aSrcLength;
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char * dest = aDest;
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char * destEnd = aDest + *aDestLength;
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char16_t srcChar, tempChar;
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int32_t bcr, bcw;
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bcw = destEnd - dest;
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res = ChangeCharset(JIS_X_208_INDEX, dest, &bcw);
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dest += bcw;
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if (res != NS_OK) {
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return res;
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}
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while (src < srcEnd) {
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srcChar = *src;
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if (!IS_HANKAKU(srcChar)) {
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break;
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}
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++src;
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tempChar = gBasicMapping[(srcChar) - 0xff60];
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if (src < srcEnd) {
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// if the character could take a modifier, and the next char
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// is a modifier, modify it and eat one char16_t
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if (NEED_TO_CHECK_NIGORI(srcChar) && IS_NIGORI(*src)) {
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tempChar += NIGORI_MODIFIER;
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++src;
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} else if (NEED_TO_CHECK_MARU(srcChar) && IS_MARU(*src)) {
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tempChar += MARU_MODIFIER;
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++src;
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}
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}
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bcr = 1;
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bcw = destEnd - dest;
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res = nsUnicodeEncodeHelper::ConvertByTable(
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&tempChar, &bcr, dest, &bcw, g_ufScanClassIDs[JIS_X_208_INDEX],
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nullptr, (uMappingTable *) g_ufMappingTables[JIS_X_208_INDEX]);
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dest += bcw;
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if (res != NS_OK)
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break;
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}
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*aDestLength = dest - aDest;
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*aSrcLength = src - aSrc;
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return res;
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}
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//----------------------------------------------------------------------
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// Subclassing of nsTableEncoderSupport class [implementation]
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NS_IMETHODIMP nsUnicodeToISO2022JP::ConvertNoBuffNoErr(
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const char16_t * aSrc,
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int32_t * aSrcLength,
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char * aDest,
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int32_t * aDestLength)
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{
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nsresult res = NS_OK;
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const char16_t * src = aSrc;
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const char16_t * srcEnd = aSrc + *aSrcLength;
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char * dest = aDest;
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char * destEnd = aDest + *aDestLength;
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int32_t bcr, bcw;
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int32_t i;
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while (src < srcEnd) {
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for (i=0; i< SIZE_OF_ISO2022JP_TABLES ; i++) {
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bcr = 1;
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bcw = destEnd - dest;
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res = nsUnicodeEncodeHelper::ConvertByTable(src, &bcr, dest, &bcw,
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g_ufScanClassIDs[i], nullptr,
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(uMappingTable *) g_ufMappingTables[i]);
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if (res != NS_ERROR_UENC_NOMAPPING) break;
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}
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if ( i>= SIZE_OF_ISO2022JP_TABLES) {
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if (IS_HANKAKU(*src)) {
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bcr = srcEnd - src;
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bcw = destEnd - dest;
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res = ConvertHankaku(src, &bcr, dest, &bcw);
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dest += bcw;
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src += bcr;
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if (res == NS_OK) continue;
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} else {
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res = NS_ERROR_UENC_NOMAPPING;
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src++;
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}
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}
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if (res != NS_OK) break;
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bcw = destEnd - dest;
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res = ChangeCharset(i, dest, &bcw);
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dest += bcw;
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if (res != NS_OK) break;
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bcr = srcEnd - src;
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bcw = destEnd - dest;
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res = nsUnicodeEncodeHelper::ConvertByTable(src, &bcr, dest, &bcw,
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g_ufScanClassIDs[i], nullptr,
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(uMappingTable *) g_ufMappingTables[i]);
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src += bcr;
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dest += bcw;
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if ((res != NS_OK) && (res != NS_ERROR_UENC_NOMAPPING)) break;
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if (res == NS_ERROR_UENC_NOMAPPING) src--;
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}
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*aSrcLength = src - aSrc;
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*aDestLength = dest - aDest;
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return res;
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}
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NS_IMETHODIMP nsUnicodeToISO2022JP::FinishNoBuff(char * aDest,
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int32_t * aDestLength)
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{
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ChangeCharset(0, aDest, aDestLength);
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return NS_OK;
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}
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NS_IMETHODIMP nsUnicodeToISO2022JP::Reset()
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{
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mCharset = 0;
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return nsEncoderSupport::Reset();
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}
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