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194 lines
6.5 KiB
C
194 lines
6.5 KiB
C
/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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/* euc2sjis.c */
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#include "intlpriv.h"
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extern int MK_OUT_OF_MEMORY;
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/* net_euc2sjis(obj, eucbuf, eucbufsz)
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* Args:
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* eucbuf: Ptr to a buf of EUC chars
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* eucbufsz: Size in bytes of eucbuf
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* uncvtbuf: If entire buffer was converted, uncvtbuf[0] will be nul,
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* else this points to EUC chars that were NOT converted
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* and mz_euc2sjis() with additional EUC chars appended.
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* Return:
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* Returns NULL on failure, otherwise it returns a pointer to a buffer of
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* converted characters. Caller must XP_FREE() this memory.
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*
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* Description:
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*
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* Allocate destination buffer.
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*
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* All bytes < SS2 (0x8E) are either ASCII/Roman or invalid. Treat them
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* as ASCII/Roman and just copy them unchanged.
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*
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* If SS2, then the next byte should be a Half-width Katakana, just copy
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* it unchanged after disposing of the SS2 byte.
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*
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* If SS3, then the next 2 bytes should be JIS x212. If the bytes
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* are not in the valide range for JIS x212, then copy the SS3 and
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* continue. Leave the 2 byte to be processed from the beginning.
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*
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* If the next byte < 0xA0, this is not valid EUC, so treat it as
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* ASCII/Roman and just copy it unchanged.
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*
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* If the next 2 bytes are both >= 0xA0, then this is a valid 2-byte
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* x208, so convert them to SJIS. Otherwise, copy the 1st byte and
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* continue.
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*/
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MODULE_PRIVATE unsigned char *
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mz_euc2sjis( CCCDataObject obj,
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const unsigned char *eucbuf, /* EUC buffer for conversion */
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int32 eucbufsz) /* EUC buffer size in bytes */
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{
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char unsigned *tobuf = NULL;
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int32 tobufsz;
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register unsigned char *tobufp, *eucp; /* current byte in bufs */
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register unsigned char *tobufep, *eucep; /* end of buffers */
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int32 uncvtlen;
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unsigned char *uncvtbuf = INTL_GetCCCUncvtbuf(obj);
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/* Allocate a dest buffer: */
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/* Usually EUC will be the same length as SJIS. SJIS will be shorter
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* if Half-width Kana are used, but in the worst case, the converted
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* SJIS will be the same size as the orignal EUC + 1 for nul byte.
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*/
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uncvtlen = strlen((char *)uncvtbuf);
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tobufsz = eucbufsz + uncvtlen + 1;
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if ((tobuf = (unsigned char *)XP_ALLOC(tobufsz)) == (unsigned char *)NULL) {
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INTL_SetCCCRetval(obj, MK_OUT_OF_MEMORY);
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return(NULL);
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}
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/* Initialize pointers, etc. */
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eucp = (unsigned char *)eucbuf;
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eucep = eucp + eucbufsz - 1;
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#define uncvtp tobufp /* use tobufp as temp */
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/* If prev. unconverted chars, append unconverted
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* chars w/new chars and try to process.
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*/
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if (uncvtbuf[0] != '\0') {
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uncvtp = uncvtbuf + uncvtlen;
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while (uncvtp < (uncvtbuf + UNCVTBUF_SIZE) &&
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eucp <= eucep)
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*uncvtp++ = *eucp++;
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*uncvtp = '\0'; /* nul terminate */
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eucp = uncvtbuf; /* process unconverted first */
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eucep = uncvtp - 1;
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}
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#undef uncvtp
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tobufp = tobuf;
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tobufep = tobufp + tobufsz - 2; /* save space for terminating null */
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WHILELOOP:
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/* While EUC data && space in dest. buf. */
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while ((tobufp <= tobufep) && (eucp <= eucep)) {
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if (*eucp < SS2) { /* ASCII/JIS-Roman/invalid EUC */
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*tobufp++ = *eucp++;
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} else if (*eucp == SS2) { /* Half-width katakana */
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if (eucp+1 > eucep) /* No 2nd byte in EUC buffer? */
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break;
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eucp++; /* Dispose of SS2 */
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*tobufp++ = *eucp++;
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} else if (*eucp == SS3) { /* JIS X 0212-1990 */
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if (eucp+2 > eucep) /* No 2nd & 3rd bytes in EUC buffer? */
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break;
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if (*eucp < 0xA0 || *(eucp+1) < 0xA0) { /* Invalid EUC212 */
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*tobufp++ = *eucp++; /* process SS3 only */
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} else {
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*tobufp++ = *eucp++; /* SS3 */
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*tobufp++ = *eucp++; /* 1st 212 byte unconverted */
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*tobufp++ = *eucp++; /* 2nd 212 byte unconverted */
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}
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} else if (*eucp < 0xA0) { /* Invalid EUC: treat as Roman */
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*tobufp++ = *eucp++;
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} else { /* JIS X 0208 */
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if (eucp+1 > eucep) /* No 2nd byte in EUC buffer? */
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break;
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if (*(eucp+1) < 0xA0) { /* 1st byte OK, check if 2nd is valid */
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*tobufp++ = *eucp++; /* process 1 byte as Roman */
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} else { /* Convert EUC-208 to SJIS: Same as */
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/* jis2other.c's JIS208-to-SJIS algorithm */
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/* except JIS 8th bit is set. */
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unsigned char b;
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b = ((*eucp) & 0x7F); /* Convert 1st EUC byte to JIS */
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if (b < 0x5F) /* Convert it to SJIS byte */
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*tobufp++ = ((b + 1) >> 1) + 0x70;
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else
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*tobufp++ = ((b + 1) >> 1) + 0xB0;
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/* Convert 2nd SJIS byte */
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if ((*eucp++) & 1) { /* if 1st JIS byte is odd */
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b = ((*eucp) & 0x7F); /* convert 2nd EUC byte to JIS */
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if (b > 0x5F)
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*tobufp = b + 0x20;
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else
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*tobufp = b + 0x1F;
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} else {
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*tobufp = (*eucp & 0x7F) + 0x7E;
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}
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tobufp++;
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eucp++;
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}
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}
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}
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if (uncvtbuf[0] != '\0') {
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/* Just processed unconverted chars:
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* eucp pts to 1st unprocessed char in
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* eucbuf. Some may have been processed
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* while processing unconverted chars,
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* so set up ptrs not to process them
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* twice.
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*/
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/* If nothing was converted, this can
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* only happen if there was not
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* enough EUC data. Stop and get
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* more data.
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*/
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if (eucp == uncvtbuf) { /* Nothing converted */
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*tobufp = '\0';
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return(NULL);
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}
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eucp = (unsigned char *)eucbuf + (eucp - uncvtbuf - uncvtlen);
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eucep = (unsigned char *)eucbuf + eucbufsz - 1; /* save space for nul */
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uncvtbuf[0] = '\0'; /* No more uncoverted chars. */
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goto WHILELOOP; /* Process new data */
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}
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*tobufp = '\0'; /* null terminate dest. data */
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INTL_SetCCCLen(obj, tobufp - tobuf); /* length not counting null */
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if (eucp <= eucep) { /* uncoverted EUC? */
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tobufp = uncvtbuf; /* reuse the tobufp as a TEMP */
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while (eucp <= eucep)
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*tobufp++ = *eucp++;
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*tobufp = '\0'; /* null terminate */
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}
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return(tobuf);
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}
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