gecko-dev/lib/libi18n/is2euckr.c
1998-03-28 02:44:41 +00:00

188 lines
5.9 KiB
C

/* -*- 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.
*/
/* is2euckr.c */
#include "intlpriv.h"
extern int MK_OUT_OF_MEMORY;
/* net_iso2euckr(obj, isobuf, isobufsz, uncvtbuf)
* Args:
* isobuf: Ptr to a buf of iso-2022-kr chars
* isobufsz: Size in bytes of isobuf
* jismode: Ptr to encoding mode, use as arg for next call to
* mz_iso2euckr() for rest of current 2022-kr data. First call should
* initialize mode to ASCII (0).
* uncvtbuf: If entire buffer was converted, uncvtbuf[0] will be nul,
* else this points to iso-2022-kr chars that were NOT converted
* and mz_iso2euckr() with additional iso-2022-kr chars appended.
* Return:
* Returns NULL on failure, otherwise it returns a pointer to a buffer of
* converted EUC-KR characters. Caller must XP_FREE() this memory.
*
* Description:
*
* Allocate destination buffer (for EUC-KR).
*
* Set mode state based upon ESC sequence and SO/SI.
*
* If mode is KSC 5601, set 8th bits of next 2 bytes.
*
* If any other mode, then assume ASCII and strip the 8th bit.
*
* If either 2022-kr buffer does not contain complete char or EUC-KR buffer
* is full, then return unconverted 2022-kr to caller. Caller should
* append more data and recall mz_iso2euckr.
*/
MODULE_PRIVATE unsigned char *
mz_iso2euckr( CCCDataObject obj,
const unsigned char *isobuf, /* 2022-kr buffer for conversion */
int32 isobufsz) /* 2022-kr buffer size in bytes */
{
unsigned char *tobuf = NULL;
int32 tobufsz;
unsigned char *tobufp, *isop; /* current byte in bufs */
unsigned char *tobufep, *isoep; /* end of buffers */
int32 uncvtlen;
unsigned char *uncvtbuf = INTL_GetCCCUncvtbuf(obj);
#define euckrbufsz tobufsz
#define euckrbuf tobuf
#define euckrp tobufp
#define euckrep tobufep
/* Allocate a dest buffer: */
/* 2022-kr is usually longer than EUC-KR because of ESC seq.
*
* In the worst case (all ASCII), converted EUC-KR will be the same
* length as the original 2022-kr + 1 for nul byte
*/
uncvtlen = strlen((char *)uncvtbuf);
tobufsz = isobufsz + uncvtlen + 1;
if (!tobufsz) {
return NULL;
}
if ((tobuf = (unsigned char *)XP_ALLOC(tobufsz)) == (unsigned char *)NULL) {
INTL_SetCCCRetval(obj, MK_OUT_OF_MEMORY);
return(NULL);
}
/* Initialize pointers, etc. */
isop = (unsigned char *)isobuf;
isoep = isop + isobufsz - 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 = uncvtbuf + uncvtlen;
while (uncvtp < (uncvtbuf + UNCVTBUF_SIZE) &&
isop <= isoep)
*uncvtp++ = *isop++;
*uncvtp = '\0'; /* nul terminate */
isop = uncvtbuf; /* process unconverted first */
isoep = uncvtp - 1;
}
#undef uncvtp
tobufp = tobuf;
tobufep = tobufp + tobufsz - 2; /* save space for terminating null */
WHILELOOP:
INTL_SetCCCJismode(obj, KSC_5601_87); /* jliu doesn't want to change Tony's code too much*/
/* While 2022-kr data && space in EUC-KR buf. */
while ((tobufp <= tobufep) && (isop <= isoep)) {
if( isop[0] == ESC && isoep - isop > 3 && ( isop[1] == '$' && isop[2] == ')'
&& isop[3] == 'C' ) ){
/* eat that ESC seq. */
isop += 4;
} else if (*isop == SO) {
/* obj->jismode |= SHIFT_OUT; */
INTL_SetCCCJismode(obj, INTL_GetCCCJismode(obj) | SHIFT_OUT);
isop++;
} else if (*isop == SI) {
INTL_SetCCCJismode(obj, INTL_GetCCCJismode(obj) & (~SHIFT_OUT));
isop++;
} else if (INTL_GetCCCJismode(obj) == (KSC_5601_87 | SHIFT_OUT)) {
if(*isop == 0x20) /* jliu */
{
*euckrp++ = *isop++ ;
}
else
{
if ((isop+1) > isoep) /* Incomplete 2Byte char in JIS buf? */
break;
*euckrp++ = *isop++ | 0x80;
*euckrp++ = *isop++ | 0x80;
}
} else if ((0xA1 <= *isop) && (*isop <= 0xFE)) {
/* Somehow we hit EUC_KR data, let it through */
if ((isop+1) > isoep) /* Incomplete 2Byte char in JIS buf? */
break;
*euckrp++ = *isop++ ;
*euckrp++ = *isop++ ;
} else {
/* Unknown type: no conversion */
*euckrp++ = *isop++ & 0x7f;
}
}
if (uncvtbuf[0] != '\0') {
/* Just processed unconverted chars:
* isop pts to 1st unprocessed char in
* isobuf. 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 2022-kr data. Stop and get
* more data.
*/
if (isop == uncvtbuf) { /* Nothing converted */
*tobufp = '\0';
return(NULL);
}
isoep = (unsigned char *)isobuf + isobufsz - 1 ;
isop = (unsigned char *)isobuf + (isop - uncvtbuf - uncvtlen);
uncvtbuf[0] = '\0'; /* No more uncoverted chars. */
goto WHILELOOP; /* Process new data */
}
*tobufp = '\0'; /* null terminate dest. data */
INTL_SetCCCLen(obj, tobufp - tobuf); /* length not counting null */
if (isop <= isoep) { /* unconverted 2022-kr? */
tobufp = uncvtbuf; /* reuse the tobufp as a TEMP */
while (isop <= isoep)
*tobufp++ = *isop++;
*tobufp = '\0'; /* null terminate */
}
return(tobuf);
}