OpenWrt – Rev 1
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#include <iconv.h>
#include <errno.h>
#include <wchar.h>
#include <string.h>
#include <strings.h>
#include <stdlib.h>
#include <limits.h>
#include <dirent.h>
#include <fcntl.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <unistd.h>
#include <stdint.h>
/* builtin charmaps */
#include "charmaps.h"
/* only 0-7 are valid as dest charset */
#define UTF_16BE 000
#define UTF_16LE 001
#define UTF_32BE 002
#define UTF_32LE 003
#define WCHAR_T 004
#define UTF_8 005
#define US_ASCII 006
#define LATIN_1 007
/* additional charsets with algorithmic conversion */
#define LATIN_9 010
#define TIS_620 011
#define JIS_0201 012
/* some programs like php need this */
int _libiconv_version = _LIBICONV_VERSION;
/* these must match the constants above */
static const unsigned char charsets[] =
"\005" "UTF-8" "\0"
"\004" "WCHAR_T" "\0"
"\000" "UTF-16BE" "\0"
"\001" "UTF-16LE" "\0"
"\002" "UTF-32BE" "\0"
"\003" "UTF-32LE" "\0"
"\006" "ASCII" "\0"
"\006" "US-ASCII" "\0"
"\006" "ISO646-US" "\0"
"\006" "ISO_646.IRV:1991" "\0"
"\006" "ISO-IR-6" "\0"
"\006" "ANSI_X3.4-1968" "\0"
"\006" "ANSI_X3.4-1986" "\0"
"\006" "CP367" "\0"
"\006" "IBM367" "\0"
"\006" "US" "\0"
"\006" "CSASCII" "\0"
"\007" "ISO-8859-1" "\0"
"\007" "LATIN1" "\0"
"\010" "ISO-8859-15""\0"
"\010" "LATIN9" "\0"
"\011" "ISO-8859-11""\0"
"\011" "TIS-620" "\0"
"\012" "JIS-0201" "\0"
"\377";
/* separate identifiers for sbcs/dbcs/etc map type */
#define UCS2_8BIT 000
#define UCS3_8BIT 001
#define EUC 002
#define EUC_TW 003
#define SHIFT_JIS 004
#define BIG5 005
#define GBK 006
/* FIXME: these are not implemented yet
// EUC: A1-FE A1-FE
// GBK: 81-FE 40-7E,80-FE
// Big5: A1-FE 40-7E,A1-FE
*/
static const unsigned short maplen[] = {
[UCS2_8BIT] = 4+ 2* 128,
[UCS3_8BIT] = 4+ 3* 128,
[EUC] = 4+ 2* 94*94,
[SHIFT_JIS] = 4+ 2* 94*94,
[BIG5] = 4+ 2* 94*157,
[GBK] = 4+ 2* 126*190,
[EUC_TW] = 4+ 2* 2*94*94,
};
static int find_charmap(const char *name)
{
int i;
for (i = 0; i < (sizeof(charmaps) / sizeof(charmaps[0])); i++)
if (!strcasecmp(charmaps[i].name, name))
return i;
return -1;
}
static int find_charset(const char *name)
{
const unsigned char *s;
for (s=charsets; *s<0xff && strcasecmp(s+1, name); s+=strlen(s)+1);
return *s;
}
iconv_t iconv_open(const char *to, const char *from)
{
unsigned f, t;
int m;
if ((t = find_charset(to)) > 8)
return -1;
if ((f = find_charset(from)) < 255)
return 0 | (t<<1) | (f<<8);
if ((m = find_charmap(from)) > -1)
return 1 | (t<<1) | (m<<8);
return -1;
}
int iconv_close(iconv_t cd)
{
return 0;
}
static inline wchar_t get_16(const unsigned char *s, int endian)
{
endian &= 1;
return s[endian]<<8 | s[endian^1];
}
static inline void put_16(unsigned char *s, wchar_t c, int endian)
{
endian &= 1;
s[endian] = c>>8;
s[endian^1] = c;
}
static inline int utf8enc_wchar(char *outb, wchar_t c)
{
if (c <= 0x7F) {
*outb = c;
return 1;
}
else if (c <= 0x7FF) {
*outb++ = ((c >> 6) & 0x1F) | 0xC0;
*outb++ = ( c & 0x3F) | 0x80;
return 2;
}
else if (c <= 0xFFFF) {
*outb++ = ((c >> 12) & 0x0F) | 0xE0;
*outb++ = ((c >> 6) & 0x3F) | 0x80;
*outb++ = ( c & 0x3F) | 0x80;
return 3;
}
else if (c <= 0x10FFFF) {
*outb++ = ((c >> 18) & 0x07) | 0xF0;
*outb++ = ((c >> 12) & 0x3F) | 0x80;
*outb++ = ((c >> 6) & 0x3F) | 0x80;
*outb++ = ( c & 0x3F) | 0x80;
return 4;
}
else {
*outb++ = '?';
return 1;
}
}
static inline int utf8seq_is_overlong(char *s, int n)
{
switch (n)
{
case 2:
/* 1100000x (10xxxxxx) */
return (((*s >> 1) == 0x60) &&
((*(s+1) >> 6) == 0x02));
case 3:
/* 11100000 100xxxxx (10xxxxxx) */
return ((*s == 0xE0) &&
((*(s+1) >> 5) == 0x04) &&
((*(s+2) >> 6) == 0x02));
case 4:
/* 11110000 1000xxxx (10xxxxxx 10xxxxxx) */
return ((*s == 0xF0) &&
((*(s+1) >> 4) == 0x08) &&
((*(s+2) >> 6) == 0x02) &&
((*(s+3) >> 6) == 0x02));
}
return 0;
}
static inline int utf8seq_is_surrogate(char *s, int n)
{
return ((n == 3) && (*s == 0xED) && (*(s+1) >= 0xA0) && (*(s+1) <= 0xBF));
}
static inline int utf8seq_is_illegal(char *s, int n)
{
return ((n == 3) && (*s == 0xEF) && (*(s+1) == 0xBF) &&
(*(s+2) >= 0xBE) && (*(s+2) <= 0xBF));
}
static inline int utf8dec_wchar(wchar_t *c, unsigned char *in, size_t inb)
{
int i;
int n = -1;
/* trivial char */
if (*in <= 0x7F) {
*c = *in;
return 1;
}
/* find utf8 sequence length */
if ((*in & 0xE0) == 0xC0) n = 2;
else if ((*in & 0xF0) == 0xE0) n = 3;
else if ((*in & 0xF8) == 0xF0) n = 4;
else if ((*in & 0xFC) == 0xF8) n = 5;
else if ((*in & 0xFE) == 0xFC) n = 6;
/* starved? */
if (n > inb)
return -2;
/* decode ... */
if (n > 1 && n < 5) {
/* reject invalid sequences */
if (utf8seq_is_overlong(in, n) ||
utf8seq_is_surrogate(in, n) ||
utf8seq_is_illegal(in, n))
return -1;
/* decode ... */
*c = (char)(*in++ & (0x7F >> n));
for (i = 1; i < n; i++) {
/* illegal continuation byte */
if (*in < 0x80 || *in > 0xBF)
return -1;
*c = (*c << 6) | (*in++ & 0x3F);
}
return n;
}
/* unmapped sequence (> 4) */
return -1;
}
static inline wchar_t latin9_translit(wchar_t c)
{
/* a number of trivial iso-8859-15 <> utf-8 transliterations */
switch (c) {
case 0x20AC: return 0xA4; /* Euro */
case 0x0160: return 0xA6; /* S caron */
case 0x0161: return 0xA8; /* s caron */
case 0x017D: return 0xB4; /* Z caron */
case 0x017E: return 0xB8; /* z caron */
case 0x0152: return 0xBC; /* OE */
case 0x0153: return 0xBD; /* oe */
case 0x0178: return 0xBE; /* Y diaeresis */
default: return 0xFFFD; /* cannot translate */
}
}
size_t iconv(iconv_t cd, char **in, size_t *inb, char **out, size_t *outb)
{
size_t x=0;
unsigned char to = (cd>>1)&127;
unsigned char from = 255;
const unsigned char *map = 0;
char tmp[MB_LEN_MAX];
wchar_t c, d;
size_t k, l;
int err;
if (!in || !*in || !*inb) return 0;
if (cd & 1)
map = charmaps[cd>>8].map;
else
from = cd>>8;
for (; *inb; *in+=l, *inb-=l) {
c = *(unsigned char *)*in;
l = 1;
if (from >= UTF_8 && c < 0x80) goto charok;
switch (from) {
case WCHAR_T:
l = sizeof(wchar_t);
if (*inb < l) goto starved;
c = *(wchar_t *)*in;
break;
case UTF_8:
l = utf8dec_wchar(&c, *in, *inb);
if (!l) l++;
else if (l == (size_t)-1) goto ilseq;
else if (l == (size_t)-2) goto starved;
break;
case US_ASCII:
goto ilseq;
case LATIN_9:
if ((unsigned)c - 0xa4 <= 0xbe - 0xa4) {
static const unsigned char map[] = {
0, 0x60, 0, 0x61, 0, 0, 0, 0, 0, 0, 0,
0, 0, 0, 0, 0x7d, 0, 0, 0, 0x7e, 0, 0, 0,
0x52, 0x53, 0x78
};
if (c == 0xa4) c = 0x20ac;
else if (map[c-0xa5]) c = 0x100 | map[c-0xa5];
}
case LATIN_1:
goto charok;
case TIS_620:
if (c >= 0xa1) c += 0x0e01-0xa1;
goto charok;
case JIS_0201:
if (c >= 0xa1) {
if (c <= 0xdf) c += 0xff61-0xa1;
else goto ilseq;
}
goto charok;
case UTF_16BE:
case UTF_16LE:
l = 2;
if (*inb < 2) goto starved;
c = get_16(*in, from);
if ((unsigned)(c-0xdc00) < 0x400) goto ilseq;
if ((unsigned)(c-0xd800) < 0x400) {
l = 4;
if (*inb < 4) goto starved;
d = get_16(*in + 2, from);
if ((unsigned)(c-0xdc00) >= 0x400) goto ilseq;
c = ((c-0xd800)<<10) | (d-0xdc00);
}
break;
case UTF_32BE:
case UTF_32LE:
l = 4;
if (*inb < 4) goto starved;
// FIXME
// c = get_32(*in, from);
break;
default:
/* only support ascii supersets */
if (c < 0x80) break;
switch (map[0]) {
case UCS2_8BIT:
c -= 0x80;
break;
case EUC:
if ((unsigned)c - 0xa1 >= 94) goto ilseq;
if ((unsigned)in[0][1] - 0xa1 >= 94) goto ilseq;
c = (c-0xa1)*94 + (in[0][1]-0xa1);
l = 2;
break;
case SHIFT_JIS:
if ((unsigned)c - 0xa1 <= 0xdf-0xa1) {
c += 0xff61-0xa1;
goto charok;
}
// FIXME...
l = 2;
break;
default:
goto badf;
}
c = get_16(map + 4 + 2*c, 0);
if (c == 0xffff) goto ilseq;
goto charok;
}
if ((unsigned)c - 0xd800 < 0x800 || (unsigned)c >= 0x110000)
goto ilseq;
charok:
switch (to) {
case WCHAR_T:
if (*outb < sizeof(wchar_t)) goto toobig;
*(wchar_t *)*out = c;
*out += sizeof(wchar_t);
*outb -= sizeof(wchar_t);
break;
case UTF_8:
if (*outb < 4) {
k = utf8enc_wchar(tmp, c);
if (*outb < k) goto toobig;
memcpy(*out, tmp, k);
} else k = utf8enc_wchar(*out, c);
*out += k;
*outb -= k;
break;
case US_ASCII:
if (c > 0x7f) c = 0xfffd;
/* fall thru and count replacement in latin1 case */
case LATIN_9:
if (c >= 0x100 && c != 0xfffd)
c = latin9_translit(c);
/* fall through */
case LATIN_1:
if (c > 0xff) goto ilseq;
if (!*outb) goto toobig;
**out = c;
++*out;
--*outb;
break;
case UTF_16BE:
case UTF_16LE:
if (c < 0x10000) {
if (*outb < 2) goto toobig;
put_16(*out, c, to);
*out += 2;
*outb -= 2;
break;
}
if (*outb < 4) goto toobig;
put_16(*out, (c>>10)|0xd800, to);
put_16(*out + 2, (c&0x3ff)|0xdc00, to);
*out += 4;
*outb -= 4;
break;
default:
goto badf;
}
}
return x;
ilseq:
err = EILSEQ;
x = -1;
goto end;
badf:
err = EBADF;
x = -1;
goto end;
toobig:
err = E2BIG;
x = -1;
goto end;
starved:
err = EINVAL;
end:
errno = err;
return x;
}