gecko-dev/lib/libi18n/euc2jis.c

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/* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
*
* The contents of this file are subject to the Netscape Public License
* Version 1.0 (the "NPL"); you may not use this file except in
* compliance with the NPL. You may obtain a copy of the NPL at
* http://www.mozilla.org/NPL/
*
* Software distributed under the NPL is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
* for the specific language governing rights and limitations under the
* NPL.
*
* The Initial Developer of this code under the NPL is Netscape
* Communications Corporation. Portions created by Netscape are
* Copyright (C) 1998 Netscape Communications Corporation. All Rights
* Reserved.
*/
/* euc2jis.c */
#include "intlpriv.h"
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#if defined(MOZ_MAIL_NEWS)
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#include "katakana.h"
#endif
extern int MK_OUT_OF_MEMORY;
/* net_euc2jis(obj, eucbuf, eucbufsz)
* Args:
* eucbuf: Ptr to a buf of EUC chars
* eucbufsz: Size in bytes of eucbuf
* obj->eucmode: Ptr to encoding mode, use as arg for next call to
* mz_euc2jis() for rest of current EUC data. First call should
* initialize mode to ASCII (0).
* uncvtbuf: If entire buffer was converted, uncvtbuf[0] will be nul,
* else this points to EUC chars that were NOT converted
* and mz_euc2jis() with additional EUC chars appended.
* Return:
* Returns NULL on failure, otherwise it returns a pointer to a buffer of
* converted characters. Caller must XP_FREE() this memory.
*
* Description:
*
* Allocate destination buffer.
*
* Ouput JIS ESC sequences based upon which EUC code set.
*
* No conversion is needed for ASCII/JIS Roman characters.
*
* Clear 8th bit of 1-byte Half-width Katakana. Half-width Katakana
* is not widely used and its ESC sequence may not be recognized
* by some software. It's use on the internet is discouraged...
*
* Clear 8th bits of 2-byte JIS X 212-1990 chars. JIS-212
* is not widely used and its ESC sequence may not be recognized
* by some software. These chars do not have corresponding chars
* in JIS-208 or SJIS.
*
* Clear 8th bits of 2-byte JIS X 208-1993 chars. These are the commonly
* used chars (along with JIS-Roman).
*
* Bytes which do not fall in the EUC valid character codes are treated
* like JIS-Roman.
*
* If either EUC buffer does not contain a complete EUC char or dest buffer
* is full, then return unconverted EUC to caller. Caller should
* append more data and recall mz_euc2jis.
*/
MODULE_PRIVATE unsigned char *
mz_euc2jis( CCCDataObject obj,
const unsigned char *eucbuf, /* EUC buffer for conversion */
int32 eucbufsz) /* EUC buffer size in bytes */
{
unsigned char *tobuf = NULL;
int32 tobufsz;
register unsigned char *tobufp, *eucp; /* current byte in bufs */
register unsigned char *tobufep, *eucep; /* end of buffers */
int32 uncvtlen;
unsigned char *uncvtbuf = INTL_GetCCCUncvtbuf(obj);
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#if defined(MOZ_MAIL_NEWS)
unsigned char kanabuf[4]; /* for half-width kana */
uint32 byteused; /* for half-width kana */
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#endif
/* Allocate a dest buffer: */
/* JIS is longer than EUC because of ESC seq. In the worst case
* ( <SS2> <Half-width Kana> <Roman> ... ), the converted JIS will
* be 2-2/3 times the size of the original EUC + 1 for nul byte.
* Worst case: single half-width kana:
* ESC ( I KANA ESC ( J
*/
uncvtlen = strlen((const char *)uncvtbuf);
/* 3 times length of EUC */
tobufsz = eucbufsz + uncvtlen + ((eucbufsz + uncvtlen)<<2) + 8;
if ((tobuf = (unsigned char *)XP_ALLOC(tobufsz)) == (unsigned char *)NULL) {
INTL_SetCCCRetval(obj, MK_OUT_OF_MEMORY);
return(NULL);
}
/* Initialize pointers, etc. */
eucp = (unsigned char *)eucbuf;
eucep = eucp + eucbufsz - 1;
#define uncvtp tobufp /* use tobufp as temp */
/* If prev. unconverted chars, append unconverted
* chars w/new chars and try to process.
*/
if (uncvtbuf[0] != '\0') {
uncvtp = (unsigned char *)uncvtbuf + uncvtlen;
while (uncvtp < ((unsigned char *)uncvtbuf + UNCVTBUF_SIZE) &&
eucp <= eucep)
*uncvtp++ = *eucp++;
*uncvtp = '\0'; /* nul terminate */
eucp = (unsigned char *)uncvtbuf; /* process unconverted first */
eucep = uncvtp - 1;
}
#undef uncvtp
tobufp = tobuf;
tobufep = tobufp + tobufsz - 2; /* save space for terminating null */
WHILELOOP:
/* While EUC data && space in dest. buf. */
while ((tobufp <= tobufep) && (eucp <= eucep)) {
if (*eucp < SS2) { /* ASCII/JIS-Roman or invalid EUC */
if (INTL_GetCCCJismode(obj) != JIS_Roman) {
InsASCII_ESC(tobufp, obj);
}
*tobufp++ = *eucp++;
} else if (*eucp == SS2) { /* Half-width Katakana */
if (eucp+1 > eucep) /* No 2nd byte in EUC buffer? */
break;
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#if defined(MOZ_MAIL_NEWS)
if (!INTL_GetCCCCvtflag_SendHankakuKana(obj)) {
if (INTL_GetCCCJismode(obj) != JIS_208_83) {
Ins208_83_ESC(tobufp, obj);
}
INTL_SjisHalf2FullKana(eucp, (uint32)eucep - (uint32)eucp + 1, kanabuf, &byteused);
*tobufp++ = kanabuf[0] & 0x7F;
*tobufp++ = kanabuf[1] & 0x7F;
eucp += byteused;
} else {
if (INTL_GetCCCJismode(obj) != JIS_HalfKana) {
InsHalfKana_ESC(tobufp, obj);
}
eucp++; /* skip SS2 */
*tobufp++ = *eucp & 0x7F;
eucp++;
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}
#else
if (INTL_GetCCCJismode(obj) != JIS_HalfKana) {
InsHalfKana_ESC(tobufp, obj);
}
eucp++; /* skip SS2 */
*tobufp++ = *eucp & 0x7F;
eucp++;
#endif
} else if (*eucp == SS3) { /* JIS X 0212-1990 */
if (eucp+2 > eucep) /* No 2nd & 3rd bytes in EUC buffer? */
break;
if (*(eucp+1) <= 0xA0 || *(eucp+2) <= 0xA0) { /* Invalid EUC212 */
if (INTL_GetCCCJismode(obj) != JIS_Roman) {
InsASCII_ESC(tobufp, obj);
}
*tobufp++ = *eucp++; /* process 1 byte as Roman */
} else {
if (INTL_GetCCCJismode(obj) != JIS_212_90) {
Ins212_90_ESC(tobufp, obj);
}
eucp++; /* skip SS3 */
*tobufp++ = *eucp & 0x7F;
eucp++;
*tobufp++ = *eucp & 0x7F;
eucp++;
}
} else if (*eucp < 0xA0) { /* Invalid EUC: treat as Roman */
if (INTL_GetCCCJismode(obj) != JIS_Roman) {
InsASCII_ESC(tobufp, obj);
}
*tobufp++ = *eucp++;
} else { /* JIS X 0208-1990 */
if (eucp+1 > eucep) /* No 2nd byte in EUC buffer? */
break;
if (*(eucp+1) < 0xA0) { /* 1st byte OK, check if 2nd is valid */
if (INTL_GetCCCJismode(obj) != JIS_Roman) {
InsASCII_ESC(tobufp, obj);
}
*tobufp++ = *eucp++; /* process 1 byte as Roman */
} else {
if (INTL_GetCCCJismode(obj) != JIS_208_83) {
Ins208_83_ESC(tobufp, obj);
}
*tobufp++ = *eucp & 0x7F;
eucp++;
*tobufp++ = *eucp & 0x7F;
eucp++;
}
}
}
if (uncvtbuf[0] != '\0') {
/* Just processed unconverted chars:
* eucp pts to 1st unprocessed char in
* eucbuf. Some may have been processed
* while processing unconverted chars,
* so set up ptrs not to process them
* twice.
*/
/* If nothing was converted, this can
* only happen if there was not
* enough EUC data. Stop and get
* more data.
*/
if (eucp == (unsigned char *)uncvtbuf) { /* Nothing converted */
*tobufp = '\0';
return(NULL);
}
eucp = (unsigned char *)eucbuf +
(eucp - (unsigned char *)uncvtbuf - uncvtlen);
eucep = (unsigned char *)eucbuf + eucbufsz - 1; /* save space for nul */
uncvtbuf[0] = '\0'; /* No more uncoverted chars. */
goto WHILELOOP; /* Process new data */
}
if (INTL_GetCCCJismode(obj) != JIS_Roman) {
INTL_SetCCCJismode(obj, JIS_Roman);
InsASCII_ESC(tobufp, obj);
}
*tobufp = '\0'; /* null terminate dest. data */
INTL_SetCCCLen(obj, tobufp - tobuf); /* length not counting null */
if (eucp <= eucep) { /* uncoverted EUC? */
tobufp = (unsigned char *)uncvtbuf;/* reuse the tobufp as a TEMP */
while (eucp <= eucep)
*tobufp++ = *eucp++;
*tobufp = '\0'; /* null terminate */
}
return(tobuf);
}