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/* $Id: convert.c 1374 2003-11-27 14:11:40Z victor $ */
#include "bbs.h"
/*
* The following code is copied and modified from "autoconvert" with GPL.
*/
#ifdef CONVERT
#include "convert.h"
#include "iconv.h"
char *hzconvert(char *, int *, char *, void (*dbcvrt)());
extern const unsigned char GtoB[], BtoG[];
#define c1 (unsigned char)(s[0])
#define c2 (unsigned char)(s[1])
/* Convert: Big5 <-> GB */
static void g2b(char *s)
{
unsigned int i;
if ((c1 >= 0x81) && (c1 <= 0xfe) && (c2 >= 0x40) && (c2 <= 0xfe) && (c2 != 0x7f)) {
/*
* c1c2 in the table
*/
if (c2 < 0x7f)
i = ((c1 - 0x81) * 190 + (c2 - 0x40)) * 2;
else
i = ((c1 - 0x81) * 190 + (c2 - 0x41)) * 2;
s[0] = GtoB[i++];
s[1] = GtoB[i];
} else { /* c1c2 not in the table */
if ((char) s[1] >= 0) /* half HANZI-character */
s[0] = '?';
else { /* invalid gbk-character */
s[0] = GtoB_bad1;
s[1] = GtoB_bad2;
}
}
}
static void b2g(char *s)
{
unsigned int i;
if ((c1 >= 0x81) && (c1 <= 0xfe) && (c2 >= 0x40) && (c2 <= 0xfe) && (c2 != 0x7f)) {
/*
* c1c2 in the table
*/
if (c2 < 0x7f)
i = ((c1 - 0x81) * 190 + (c2 - 0x40)) * 2;
else
i = ((c1 - 0x81) * 190 + (c2 - 0x41)) * 2;
s[0] = BtoG[i++];
s[1] = BtoG[i];
} else { /* c1c2 not in the table */
if ((char) s[1] >= 0) /* half HANZI-character */
s[0] = '?';
else { /* invalid big5-character */
s[0] = BtoG_bad1;
s[1] = BtoG_bad2;
}
}
}
unsigned char *gb2big(unsigned char *s, int plen)
{
unsigned char c = 0;
return hzconvert(s, &plen, &c, g2b);
}
unsigned char *big2gb(unsigned char *s, int plen)
{
unsigned char c = 0;
return hzconvert(s, &plen, &c, b2g);
}
int gb_converting_read(int fd, void *buf, size_t count)
{
int len = read(fd, buf, count);
if (len >= 0)
gb2big(buf, len);
return len;
}
int gb_converting_write(int fd, void *buf, size_t count)
{
big2gb(buf, count);
return write(fd, buf, count);
}
/* Convert: Big5 <-> Unicode */
/**************************/
static iconv_t big2ucs, ucs2big;
int ucs_converting_init(void)
{
big2ucs = iconv_open("utf8", "big5");
ucs2big = iconv_open("big5", "utf8");
return (big2ucs < 0 || ucs2big < 0);
}
int str_iconv(iconv_t desc, char *src, int srclen)
{
int iconv_ret;
/* Start translation */
while (srclen > 0) {
iconv_ret = iconv(desc, (const char* *)&src, &srclen, &src, &srclen);
// deslen - 1 ?? iconv_ret = iconv(desc, (const char* *)&src, &srclen, &src, &srclen);
if (iconv_ret != 0) {
switch(errno) {
case EILSEQ:
/* forward that byte */
src++; srclen--;
break;
/* incomplete multibyte happened */
case EINVAL:
/* forward that byte (maybe wrong)*/
src++; srclen--;
break;
/* des no rooms */
case E2BIG:
/* break out the while loop */
srclen = 0;
break;
}
}
}
*src= '\0';
return srclen;
}
//int str_iconv(iconv_t desc, char *src, int srclen)
//{
// deslen--; /* keep space for '\0' */
// deslen_old = deslen;
//
// /* Start translation */
// while (srclen > 0 && deslen > 0) {
// iconv_ret = iconv(desc, (const char* *)&src, &srclen, &des, &deslen);
// if (iconv_ret != 0) {
// switch(errno) {
// case EILSEQ:
// /* forward that byte */
// *des = *src;
// src++; srclen--;
// des++; deslen--;
// break;
// /* incomplete multibyte happened */
// case EINVAL:
// /* forward that byte (maybe wrong)*/
// *des = *src;
// src++; srclen--;
// des++; deslen--;
// break;
// /* des no rooms */
// case E2BIG:
// /* break out the while loop */
// srclen = 0;
// break;
// }
// }
// }
// *des = '\0';
// return deslen_old - deslen;
//}
int ucs_converting_read(int fd, void *buf, size_t count)
{
int len;
if ((len = read(fd, buf, count)) < 0)
str_iconv(ucs2big, buf, count);
return len;
}
int ucs_converting_write(int fd, void *buf, size_t count)
{
str_iconv(big2ucs, buf, count);
return write(fd, buf, count);
}
/* we don't need it since one cannot use it after stop mbbsd
void ucs_finish_converting(void)
{
iconv_close(big2ucs);
iconv_close(ucs2big);
}
*/
#endif
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