michael@0: /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: #include "nsISO2022CNToUnicode.h"
michael@0: #include "nsUCSupport.h"
michael@0: #include "nsICharsetConverterManager.h"
michael@0: #include "nsServiceManagerUtils.h"
michael@0: 
michael@0: static NS_DEFINE_CID(kCharsetConverterManagerCID, NS_ICHARSETCONVERTERMANAGER_CID);
michael@0: 
michael@0: NS_IMETHODIMP nsISO2022CNToUnicode::GB2312_To_Unicode(unsigned char *aSrc, int32_t aSrcLength, char16_t * aDest, int32_t * aDestLength)
michael@0: {
michael@0:     nsresult rv;
michael@0: 
michael@0:     if(!mGB2312_Decoder) {
michael@0:        // creating a delegate converter (GB2312)
michael@0:        nsCOMPtr<nsICharsetConverterManager> ccm =
michael@0:               do_GetService(kCharsetConverterManagerCID, &rv);
michael@0:        if(NS_FAILED(rv))
michael@0:           return NS_ERROR_UNEXPECTED;
michael@0: 
michael@0:        rv = ccm->GetUnicodeDecoderRaw("GB2312", getter_AddRefs(mGB2312_Decoder));
michael@0:        if(NS_FAILED(rv))
michael@0:           return NS_ERROR_UNEXPECTED;
michael@0:     }
michael@0: 
michael@0:     if(!mGB2312_Decoder) // failed creating a delegate converter
michael@0:        return NS_ERROR_UNEXPECTED;
michael@0: 
michael@0:     rv = mGB2312_Decoder->Convert((const char *)aSrc, &aSrcLength, aDest, aDestLength);
michael@0:     return rv;
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP nsISO2022CNToUnicode::EUCTW_To_Unicode(unsigned char *aSrc, int32_t aSrcLength, char16_t * aDest, int32_t * aDestLength)
michael@0: {
michael@0:     nsresult rv;
michael@0: 
michael@0:     if(!mEUCTW_Decoder) {
michael@0:        // creating a delegate converter (x-euc-tw)
michael@0:        nsCOMPtr<nsICharsetConverterManager> ccm =
michael@0:               do_GetService(kCharsetConverterManagerCID, &rv);
michael@0:        if(NS_FAILED(rv))
michael@0:           return NS_ERROR_UNEXPECTED;
michael@0: 
michael@0:        rv = ccm->GetUnicodeDecoderRaw("x-euc-tw", getter_AddRefs(mEUCTW_Decoder));
michael@0:        if(NS_FAILED(rv))
michael@0:           return NS_ERROR_UNEXPECTED;
michael@0:     }
michael@0: 
michael@0:     if(!mEUCTW_Decoder) // failed creating a delegate converter
michael@0:        return NS_ERROR_UNEXPECTED;
michael@0: 
michael@0:     rv = mEUCTW_Decoder->Convert((const char *)aSrc, &aSrcLength, aDest, aDestLength);
michael@0:     return(rv);
michael@0: }
michael@0: 
michael@0: NS_IMETHODIMP nsISO2022CNToUnicode::Convert(const char * aSrc, int32_t * aSrcLen, char16_t * aDest, int32_t * aDestLen)
michael@0: {
michael@0:   const unsigned char * srcEnd = (unsigned char *)aSrc + *aSrcLen;
michael@0:   const unsigned char * src = (unsigned char *) aSrc;
michael@0:   char16_t* destEnd = aDest + *aDestLen;
michael@0:   char16_t* dest = aDest;
michael@0:   nsresult rv;
michael@0:   int32_t aLen; 
michael@0: 
michael@0:   while ((src < srcEnd))
michael@0:   {
michael@0:     switch (mState)
michael@0:     {
michael@0:       case eState_ASCII:
michael@0:         if(ESC == *src) {
michael@0:            mState = eState_ESC;
michael@0:         } else {
michael@0:            if (CHECK_OVERRUN(dest, destEnd, 1))
michael@0:               goto error1;
michael@0:            *dest++ = (0x80 & *src) ? 0xFFFD : (char16_t) *src;
michael@0: 
michael@0:            mState = eState_ASCII;
michael@0:         }
michael@0:         break;
michael@0: 
michael@0:       case eState_ESC:    // ESC
michael@0:         if('$' == *src) {
michael@0:            mState = eState_ESC_24;
michael@0:         } else {
michael@0:            if (CHECK_OVERRUN(dest, destEnd, 2))
michael@0:               goto error1;
michael@0:            *dest++ = (char16_t) ESC;
michael@0:            *dest++ = (0x80 & *src) ? 0xFFFD : (char16_t) *src;
michael@0: 
michael@0:            mState = eState_ASCII;
michael@0:         }
michael@0:         break;
michael@0: 
michael@0:       case eState_ESC_24: // ESC $
michael@0:         if(')' == *src) {
michael@0:            mState = eState_ESC_24_29;
michael@0:         } else if('*' == *src) {
michael@0:            mState = eState_ESC_24_2A;
michael@0:         } else if('+' == *src) {
michael@0:            mState = eState_ESC_24_2B;
michael@0:         } else {
michael@0:            if (CHECK_OVERRUN(dest, destEnd, 3))
michael@0:               goto error1;
michael@0:            *dest++ = (char16_t) ESC;
michael@0:            *dest++ = (char16_t) '$';
michael@0:            *dest++ = (0x80 & *src) ? 0xFFFD : (char16_t) *src;
michael@0: 
michael@0:            mState = eState_ASCII;
michael@0:         }
michael@0:         break;
michael@0: 
michael@0:       case eState_ESC_24_29: // ESC $ )
michael@0:         if('A' == *src) {
michael@0:            mState = eState_ESC_24_29_A;
michael@0:         } else if('G' == *src) {
michael@0:            mState = eState_ESC_24_29_G;
michael@0:         } else {
michael@0:            if (CHECK_OVERRUN(dest, destEnd, 4))
michael@0:               goto error1;
michael@0:            *dest++ = (char16_t) ESC;
michael@0:            *dest++ = (char16_t) '$';
michael@0:            *dest++ = (char16_t) ')';
michael@0:            *dest++ = (0x80 & *src) ? 0xFFFD : (char16_t) *src;
michael@0: 
michael@0:            mState = eState_ASCII;
michael@0:         }
michael@0:         break;
michael@0: 
michael@0:       case eState_ESC_24_29_A:  // ESC $ ) A
michael@0:         if(SO == *src) {
michael@0:            mState = eState_GB2312_1980;
michael@0:            mRunLength = 0;
michael@0:         } else {
michael@0:            if (CHECK_OVERRUN(dest, destEnd, 5))
michael@0:               goto error1;
michael@0:            *dest++ = (char16_t) ESC;
michael@0:            *dest++ = (char16_t) '$';
michael@0:            *dest++ = (char16_t) ')';
michael@0:            *dest++ = (char16_t) 'A';
michael@0:            *dest++ = (0x80 & *src) ? 0xFFFD : (char16_t) *src;
michael@0: 
michael@0:            mState = eState_ASCII;
michael@0:         }
michael@0:         break;
michael@0: 
michael@0:       case eState_GB2312_1980:   // ESC $ ) A SO
michael@0:         if(SI == *src) { // Shift-In (SI)
michael@0:            mState = eState_ESC_24_29_A_SO_SI;
michael@0:            if (mRunLength == 0) {
michael@0:               if (CHECK_OVERRUN(dest, destEnd, 1))
michael@0:                  goto error1;
michael@0:               *dest++ = 0xFFFD;
michael@0:            }
michael@0:            mRunLength = 0;
michael@0:         } else if(ESC == *src) {
michael@0:            mState = eState_ESC;
michael@0:         } else {
michael@0:            if(0x20 < *src && *src < 0x7f) {
michael@0:               mData = *src;
michael@0:               mState = eState_GB2312_1980_2ndbyte;
michael@0:            } else {
michael@0:               if (CHECK_OVERRUN(dest, destEnd, 1))
michael@0:                  goto error1;
michael@0:               *dest++ = (0x80 & *src) ? 0xFFFD : (char16_t) *src;
michael@0:            }
michael@0:         }
michael@0:         break; 
michael@0: 
michael@0:       case eState_GB2312_1980_2ndbyte:  // ESC $ ) A SO
michael@0:         if(0x20 < *src && *src < 0x7f) {
michael@0:            unsigned char gb[2];
michael@0:            int32_t gbLen = 2;
michael@0: 
michael@0:            gb[0] = mData | 0x80;
michael@0:            gb[1] = *src | 0x80;
michael@0: 
michael@0:            aLen = destEnd - dest;
michael@0:            rv = GB2312_To_Unicode(gb, gbLen, dest, &aLen);
michael@0:            ++mRunLength;
michael@0:            if(rv == NS_OK_UDEC_MOREOUTPUT) {
michael@0:               goto error1;
michael@0:            } else if(NS_FAILED(rv)) {
michael@0:               goto error2;
michael@0:            }
michael@0: 
michael@0:            dest += aLen;
michael@0:         } else {
michael@0:            if (CHECK_OVERRUN(dest, destEnd, 2))
michael@0:               goto error1;
michael@0:            *dest++ = (char16_t) mData;
michael@0:            *dest++ = (0x80 & *src) ? 0xFFFD : (char16_t) *src;
michael@0:         }
michael@0:         mState = eState_GB2312_1980;
michael@0:         break;
michael@0: 
michael@0:       case eState_ESC_24_29_A_SO_SI:  // ESC $ ) A SO SI
michael@0:         if(SO == *src) {
michael@0:            mState = eState_GB2312_1980;
michael@0:            mRunLength = 0;
michael@0:         } else if(ESC == *src) {
michael@0:            mState = eState_ESC;
michael@0:         } else {
michael@0:            if (CHECK_OVERRUN(dest, destEnd, 1))
michael@0:               goto error1;
michael@0:            *dest++ = (0x80 & *src) ? 0xFFFD : (char16_t) *src;
michael@0: 
michael@0:            mState = eState_ESC_24_29_A_SO_SI;
michael@0:         }
michael@0:         break;
michael@0: 
michael@0:       case eState_ESC_24_29_G:   // ESC $ ) G
michael@0:         if(SO == *src) {
michael@0:            mState = eState_CNS11643_1;
michael@0:            mRunLength = 0;
michael@0:         } else {
michael@0:            if (CHECK_OVERRUN(dest, destEnd, 5))
michael@0:               goto error1;
michael@0:            *dest++ = (char16_t) ESC;
michael@0:            *dest++ = (char16_t) '$';
michael@0:            *dest++ = (char16_t) ')';
michael@0:            *dest++ = (char16_t) 'G';
michael@0:            *dest++ = (0x80 & *src) ? 0xFFFD : (char16_t) *src;
michael@0: 
michael@0:            mState = eState_ASCII;
michael@0:         }
michael@0:         break;
michael@0: 
michael@0:       case eState_CNS11643_1:   // ESC $ ) G SO
michael@0:         if(SI == *src) { // Shift-In (SI)
michael@0:            mState = eState_ESC_24_29_G_SO_SI;
michael@0:            if (mRunLength == 0) {
michael@0:               if (CHECK_OVERRUN(dest, destEnd, 1))
michael@0:                  goto error1;
michael@0:               *dest++ = 0xFFFD;
michael@0:            }
michael@0:            mRunLength = 0;
michael@0:         } else if(ESC == *src) {
michael@0:            mState = eState_ESC;
michael@0:         } else {
michael@0:            if(0x20 < *src && *src < 0x7f) {
michael@0:               mData = *src;
michael@0:               mState = eState_CNS11643_1_2ndbyte;
michael@0:            } else {
michael@0:               if (CHECK_OVERRUN(dest, destEnd, 1))
michael@0:                  goto error1;
michael@0:               *dest++ = (0x80 & *src) ? 0xFFFD : (char16_t) *src;
michael@0:            }
michael@0:         }
michael@0:         break;
michael@0: 
michael@0:       case eState_CNS11643_1_2ndbyte:  // ESC $ ) G SO
michael@0:         if(0x20 < *src && *src < 0x7f) {
michael@0:            unsigned char cns[4];
michael@0:            int32_t cnsLen = 2;
michael@0: 
michael@0:            cns[0] = mData | 0x80;
michael@0:            cns[1] = *src | 0x80;
michael@0: 
michael@0:            aLen = destEnd - dest;
michael@0:            rv = EUCTW_To_Unicode(cns, cnsLen, dest, &aLen);
michael@0:            ++mRunLength;
michael@0:            if(rv == NS_OK_UDEC_MOREOUTPUT) {
michael@0:               goto error1;
michael@0:            } else if(NS_FAILED(rv)) {
michael@0:               goto error2;
michael@0:            }
michael@0: 
michael@0:            dest += aLen;
michael@0:         } else {
michael@0:            if (CHECK_OVERRUN(dest, destEnd, 2))
michael@0:               goto error1;
michael@0:            *dest++ = (char16_t) mData;
michael@0:            *dest++ = (0x80 & *src) ? 0xFFFD : (char16_t) *src;
michael@0:         }
michael@0:         mState = eState_CNS11643_1;
michael@0:         break;
michael@0: 
michael@0:       case eState_ESC_24_29_G_SO_SI: // ESC $ ) G SO SI
michael@0:         if(SO == *src) {
michael@0:            mState = eState_CNS11643_1;
michael@0:            mRunLength = 0;
michael@0:         } else if(ESC == *src) {
michael@0:            mState = eState_ESC;
michael@0:         } else {
michael@0:            if (CHECK_OVERRUN(dest, destEnd, 1))
michael@0:               goto error1;
michael@0:            *dest++ = (0x80 & *src) ? 0xFFFD : (char16_t) *src;
michael@0: 
michael@0:            mState = eState_ESC_24_29_G_SO_SI;
michael@0:         }
michael@0:         break;
michael@0: 
michael@0:       case eState_ESC_24_2A: // ESC $ *
michael@0:         if('H' == *src) {
michael@0:            mState = eState_ESC_24_2A_H;
michael@0:         } else {
michael@0:            if (CHECK_OVERRUN(dest, destEnd, 4))
michael@0:               goto error1;
michael@0:            *dest++ = (char16_t) ESC;
michael@0:            *dest++ = (char16_t) '$';
michael@0:            *dest++ = (char16_t) '*';
michael@0:            *dest++ = (0x80 & *src) ? 0xFFFD : (char16_t) *src;
michael@0: 
michael@0:            mState = eState_ASCII;
michael@0:         }
michael@0:         break;
michael@0: 
michael@0:       case eState_ESC_24_2A_H:  // ESC $ * H
michael@0:         if(ESC == *src) {
michael@0:            mState = eState_ESC_24_2A_H_ESC;
michael@0:         } else {
michael@0:            if (CHECK_OVERRUN(dest, destEnd, 5))
michael@0:               goto error1;
michael@0:            *dest++ = (char16_t) ESC;
michael@0:            *dest++ = (char16_t) '$';
michael@0:            *dest++ = (char16_t) '*';
michael@0:            *dest++ = (char16_t) 'H';
michael@0:            *dest++ = (0x80 & *src) ? 0xFFFD : (char16_t) *src;
michael@0: 
michael@0:            mState = eState_ASCII;
michael@0:         } 
michael@0:         break;
michael@0: 
michael@0:       case eState_ESC_24_2A_H_ESC:  // ESC $ * H ESC
michael@0:         if(SS2 == *src) {
michael@0:            mState = eState_CNS11643_2;
michael@0:            mRunLength = 0;
michael@0:         } else if('$' == *src) {
michael@0:            mState = eState_ESC_24;
michael@0:         } else {
michael@0:            if (CHECK_OVERRUN(dest, destEnd, 6))
michael@0:               goto error1;
michael@0:            *dest++ = (char16_t) ESC;
michael@0:            *dest++ = (char16_t) '$';
michael@0:            *dest++ = (char16_t) '*';
michael@0:            *dest++ = (char16_t) 'H';
michael@0:            *dest++ = (char16_t) ESC;
michael@0:            *dest++ = (0x80 & *src) ? 0xFFFD : (char16_t) *src;
michael@0: 
michael@0:            mState = eState_ASCII;
michael@0:         }
michael@0:         break;
michael@0: 
michael@0:       case eState_CNS11643_2:  // ESC $ * H ESC SS2
michael@0:         if(SI == *src) { // Shift-In (SI)
michael@0:            mState = eState_ESC_24_2A_H_ESC_SS2_SI;
michael@0:            if (mRunLength == 0) {
michael@0:               if (CHECK_OVERRUN(dest, destEnd, 1))
michael@0:                  goto error1;
michael@0:               *dest++ = 0xFFFD;
michael@0:            }
michael@0:            mRunLength = 0;
michael@0:         } else if(ESC == *src) {
michael@0:            mState = eState_ESC_24_2A_H_ESC;
michael@0:         } else {
michael@0:            if(0x20 < *src && *src < 0x7f) {
michael@0:               mData = *src;
michael@0:               mState = eState_CNS11643_2_2ndbyte;
michael@0:            } else {
michael@0:               if (CHECK_OVERRUN(dest, destEnd, 1))
michael@0:                  goto error1;
michael@0:               *dest++ = (0x80 & *src) ? 0xFFFD : (char16_t) *src;
michael@0:            }
michael@0:         }
michael@0:         break;
michael@0: 
michael@0:       case eState_CNS11643_2_2ndbyte:   // ESC $ * H ESC SS2
michael@0:         if(0x20 < *src && *src < 0x7f) {
michael@0:            unsigned char cns[4];
michael@0:            int32_t cnsLen = 4;
michael@0:  
michael@0:            cns[0] = (unsigned char) MBYTE;
michael@0:            cns[1] = (unsigned char) (PMASK + 2);
michael@0:            cns[2] = mData | 0x80;
michael@0:            cns[3] = *src | 0x80;
michael@0:  
michael@0:            aLen = destEnd - dest;
michael@0:            rv = EUCTW_To_Unicode(cns, cnsLen, dest, &aLen);
michael@0:            ++mRunLength;
michael@0:            if(rv == NS_OK_UDEC_MOREOUTPUT) {
michael@0:               goto error1;
michael@0:            } else if(NS_FAILED(rv)) {
michael@0:               goto error2;
michael@0:            }
michael@0: 
michael@0:            dest += aLen;
michael@0:         } else {
michael@0:            if (CHECK_OVERRUN(dest, destEnd, 2))
michael@0:               goto error1;
michael@0:            *dest++ = (char16_t) mData;
michael@0:            *dest++ = (0x80 & *src) ? 0xFFFD : (char16_t) *src;
michael@0:         }
michael@0:         mState = eState_CNS11643_2;
michael@0:         break;
michael@0: 
michael@0:       case eState_ESC_24_2A_H_ESC_SS2_SI:  // ESC $ * H ESC SS2 SI
michael@0:         if(ESC == *src) {
michael@0:            mState = eState_ESC_24_2A_H_ESC_SS2_SI_ESC;
michael@0:         } else {
michael@0:            if (CHECK_OVERRUN(dest, destEnd, 1))
michael@0:               goto error1;
michael@0:            *dest++ = (0x80 & *src) ? 0xFFFD : (char16_t) *src;
michael@0: 
michael@0:            mState = eState_ESC_24_2A_H_ESC_SS2_SI;
michael@0:         }
michael@0:         break;
michael@0: 
michael@0:       case eState_ESC_24_2A_H_ESC_SS2_SI_ESC:  // ESC $ * H ESC SS2 SI ESC
michael@0:         if(SS2 == *src) {
michael@0:            mState = eState_CNS11643_2;
michael@0:            mRunLength = 0;
michael@0:         } else if('$' == *src) {
michael@0:            mState = eState_ESC_24;
michael@0:         } else {
michael@0:            if (CHECK_OVERRUN(dest, destEnd, 1))
michael@0:               goto error1;
michael@0:            *dest++ = (0x80 & *src) ? 0xFFFD : (char16_t) *src;
michael@0: 
michael@0:            mState = eState_ESC_24_2A_H_ESC_SS2_SI;
michael@0:         }
michael@0:         break;
michael@0: 
michael@0:       case eState_ESC_24_2B: // ESC $ +
michael@0:         if('I' <= *src && *src <= 'M') {
michael@0:             mState = eState_ESC_24_2B_I;
michael@0:             mPlaneID = *src - 'I' + 3;
michael@0:         } else {
michael@0:            if (CHECK_OVERRUN(dest, destEnd, 4))
michael@0:               goto error1;
michael@0:            *dest++ = (char16_t) ESC;
michael@0:            *dest++ = (char16_t) '$';
michael@0:            *dest++ = (char16_t) '+';
michael@0:            *dest++ = (0x80 & *src) ? 0xFFFD : (char16_t) *src;
michael@0: 
michael@0:            mState = eState_ASCII;
michael@0:         }
michael@0:         break;
michael@0: 
michael@0:       case eState_ESC_24_2B_I:  // ESC $ + I
michael@0:         if(ESC == *src) {
michael@0:            mState = eState_ESC_24_2B_I_ESC;
michael@0:         } else {
michael@0:            if (CHECK_OVERRUN(dest, destEnd, 5))
michael@0:               goto error1;
michael@0:            *dest++ = (char16_t) ESC;
michael@0:            *dest++ = (char16_t) '$';
michael@0:            *dest++ = (char16_t) '+';
michael@0:            *dest++ = (char16_t) 'I' + mPlaneID - 3;
michael@0:            *dest++ = (0x80 & *src) ? 0xFFFD : (char16_t) *src;
michael@0: 
michael@0:            mState = eState_ASCII;
michael@0:         }
michael@0:         break;
michael@0: 
michael@0:       case eState_ESC_24_2B_I_ESC:  // ESC $ + I ESC
michael@0:         if(SS3 == *src) {
michael@0:            mState = eState_CNS11643_3;
michael@0:            mRunLength = 0;
michael@0:         } else if('$' == *src) {
michael@0:            mState = eState_ESC_24;
michael@0:         } else {
michael@0:            if (CHECK_OVERRUN(dest, destEnd, 6))
michael@0:               goto error1;
michael@0:            *dest++ = (char16_t) ESC;
michael@0:            *dest++ = (char16_t) '$';
michael@0:            *dest++ = (char16_t) '+';
michael@0:            *dest++ = (char16_t) 'I' + mPlaneID - 3;
michael@0:            *dest++ = (char16_t) ESC;
michael@0:            *dest++ = (0x80 & *src) ? 0xFFFD : (char16_t) *src;
michael@0: 
michael@0:            mState = eState_ASCII;
michael@0:         }
michael@0:         break;
michael@0: 
michael@0:       case eState_CNS11643_3:   // ESC $ + I ESC SS3
michael@0:         if(SI == *src) { // Shift-In (SI)
michael@0:            mState = eState_ESC_24_2B_I_ESC_SS3_SI;
michael@0:            if (mRunLength == 0) {
michael@0:               if (CHECK_OVERRUN(dest, destEnd, 1))
michael@0:                  goto error1;
michael@0:               *dest++ = 0xFFFD;
michael@0:            }
michael@0:            mRunLength = 0;
michael@0:         } else if(ESC == *src) {
michael@0:            mState = eState_ESC_24_2B_I_ESC;
michael@0:         } else {
michael@0:            if(0x20 < *src && *src < 0x7f) {
michael@0:               mData = *src;
michael@0:               mState = eState_CNS11643_3_2ndbyte;
michael@0:            } else {
michael@0:               if (CHECK_OVERRUN(dest, destEnd, 1))
michael@0:                  goto error1;
michael@0:               *dest++ = (0x80 & *src) ? 0xFFFD : (char16_t) *src;
michael@0:            }
michael@0:         }
michael@0: 
michael@0:         break;
michael@0: 
michael@0:       case eState_CNS11643_3_2ndbyte:  // ESC $ + I ESC SS3
michael@0:         if(0x20 < *src && *src < 0x7f) {
michael@0:            unsigned char cns[4];
michael@0:            int32_t cnsLen = 4;
michael@0: 
michael@0:            cns[0] = (unsigned char) MBYTE;
michael@0:            cns[1] = (unsigned char) (PMASK + mPlaneID);
michael@0:            cns[2] = mData | 0x80;
michael@0:            cns[3] = *src | 0x80;
michael@0: 
michael@0:            aLen = destEnd - dest;
michael@0:            rv = EUCTW_To_Unicode(cns, cnsLen, dest, &aLen);
michael@0:            ++mRunLength;
michael@0:            if(rv == NS_OK_UDEC_MOREOUTPUT) {
michael@0:               goto error1;
michael@0:            } else if(NS_FAILED(rv)) {
michael@0:               goto error2;
michael@0:            }
michael@0: 
michael@0:            dest += aLen;
michael@0:         } else {
michael@0:            if (CHECK_OVERRUN(dest, destEnd, 2))
michael@0:               goto error1;
michael@0:            *dest++ = (char16_t) mData;
michael@0:            *dest++ = (0x80 & *src) ? 0xFFFD : (char16_t) *src;
michael@0:         }
michael@0:         mState = eState_CNS11643_3;
michael@0:         break;
michael@0: 
michael@0:       case eState_ESC_24_2B_I_ESC_SS3_SI:  // ESC $ + I ESC SS3 SI
michael@0:         if(ESC == *src) {
michael@0:            mState = eState_ESC_24_2B_I_ESC_SS3_SI_ESC;
michael@0:         } else {
michael@0:            if (CHECK_OVERRUN(dest, destEnd, 1))
michael@0:               goto error1;
michael@0:            *dest++ = (0x80 & *src) ? 0xFFFD : (char16_t) *src;
michael@0: 
michael@0:            mState = eState_ESC_24_2B_I_ESC_SS3_SI;
michael@0:         }
michael@0:         break;
michael@0: 
michael@0:       case eState_ESC_24_2B_I_ESC_SS3_SI_ESC:  // ESC $ + I ESC SS3 SI ESC
michael@0:         if(SS3 == *src) {
michael@0:            mState = eState_CNS11643_3;
michael@0:            mRunLength = 0;
michael@0:         } else if('$' == *src) {
michael@0:            mState = eState_ESC_24;
michael@0:         } else {
michael@0:            if (CHECK_OVERRUN(dest, destEnd, 1))
michael@0:               goto error1;
michael@0:            *dest++ = (0x80 & *src) ? 0xFFFD : (char16_t) *src;
michael@0: 
michael@0:            mState = eState_ESC_24_2B_I_ESC_SS3_SI;
michael@0:         }
michael@0:         break;
michael@0: 
michael@0:       case eState_ERROR:
michael@0:         NS_NOTREACHED("unhandled case");
michael@0:         goto error2;
michael@0: 
michael@0:     } // switch
michael@0:     src++;
michael@0:   }
michael@0: 
michael@0:   *aDestLen = dest- aDest;
michael@0:   return NS_OK;
michael@0: 
michael@0: error1:
michael@0:   *aDestLen = dest-aDest;
michael@0:   *aSrcLen = src - (const unsigned char*)aSrc;
michael@0:   return NS_OK_UDEC_MOREOUTPUT;
michael@0: 
michael@0: error2:
michael@0:   *aSrcLen = src - (const unsigned char*)aSrc;
michael@0:   *aDestLen = dest-aDest;
michael@0:   mState = eState_ASCII;
michael@0:   return NS_ERROR_UNEXPECTED;
michael@0: }