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/* vi: set sw=4 ts=4: */
/*
* CCE - Console Chinese Environment -
* Copyright (C) 1998-2003 Rui He (rhe@3eti.com)
*
* 2006-04-07: modified by ejoy <ejoy@users.sf.net> for use in zhcon to convert from/to UTF-8
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE TERRENCE R. LAMBERT BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <assert.h>
#include <string.h>
#include "encfilter.h"
#ifdef HAVE_ICONV
#ifndef ICONV_CONST
#error ICONV_CONST not defined
#endif /* ICONV_CONST */
#define BUFSIZ 8192
int UseEncodingFilter; /* use filter such as UTF-8 */
char EncodingFilterBuff[BUFSIZ]; /* global buffer used by ConsoleHandler() and TextCopy() */
size_t EncodingFilterLen;
static iconv_t FilterCD[2]; /* 0 is from filter to target, 1 is reverse */
void CleanupEncodingFilter(void)
{
if (FilterCD[0] && FilterCD[0] != (iconv_t)-1) iconv_close(FilterCD[0]);
if (FilterCD[1] && FilterCD[1] != (iconv_t)-1) iconv_close(FilterCD[1]);
FilterCD[0] = FilterCD[1] = NULL;
}
int SetupEncodingFilter(const char* sysCoding)
{
/* For better support of JP and KR. */
if(!strcmp(sysCoding, "jis")) sysCoding = "EUC-JP";
if(!strcmp(sysCoding, "ksc")) sysCoding = "EUC-KR";
#ifdef __GLIBC__
if (! strstr(sysCoding, "//TRANSLIT")) {
char *sysCodingTranslit;
if ((sysCodingTranslit = malloc(strlen(sysCoding) + strlen("//TRANSLIT") + 1))) {
int ret;
sprintf(sysCodingTranslit, "%s%s", sysCoding, "//TRANSLIT");
ret = SetupEncodingFilter(sysCodingTranslit);
free((void *) sysCodingTranslit);
return ret;
}
}
#endif
assert(UseEncodingFilter);
/* printf("setting utf8 filter for %s\n", sysCoding);*/
CleanupEncodingFilter(); /* close old ones */
UseEncodingFilter = 0;
if ((FilterCD[CONVERT_FROM_UTF8_FILTER] = iconv_open(sysCoding, "UTF-8")) == (iconv_t)-1)
{
fprintf(stderr, "Failed to do iconv_open(%s,%s), filter disabled.\r\n", sysCoding, "UTF-8");
return -1;
}
if ((FilterCD[CONVERT_TO_UTF8_FILTER] = iconv_open("UTF-8", sysCoding)) == (iconv_t)-1)
{
iconv_close(FilterCD[0]);
FilterCD[0] = NULL;
return -1;
}
/* fprintf(stderr, "Using encoding filter %s for %s.\r\n", "UTF-8", sysCoding);*/
UseEncodingFilter = 1;
return 0;
}
/* return the number of bytes remained in inbuf */
int DoEncodingFilter(int dir, char *inbuf, size_t inlen)
{
size_t ret;
ICONV_CONST char *oldinbuf = (ICONV_CONST char*)inbuf;
char *outbuf = EncodingFilterBuff;
if (!inbuf || inlen <= 0) return 0;
EncodingFilterLen = sizeof(EncodingFilterBuff);
ret = iconv(FilterCD[dir], &inbuf, &inlen, &outbuf, &EncodingFilterLen);
EncodingFilterLen = sizeof(EncodingFilterBuff) - EncodingFilterLen; /* converted */
if (ret == -1)
{
switch(errno)
{
case EINVAL: /* incomplete, inbuf is pointing to incomplete buffer */
case E2BIG: /* output room is not enough */
memcpy(oldinbuf, inbuf, inlen); /* save them to the beginning */
return inlen;
case EILSEQ: /* illegal sequence */
default:
return 0;
}
}
return 0; /* inlen should be 0 since everything is converted */
}
#endif /* HAVE_ICONV */
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