Root/package/libs/libiconv/src/iconv.c

1#include <iconv.h>
2#include <errno.h>
3#include <wchar.h>
4#include <string.h>
5#include <strings.h>
6#include <stdlib.h>
7#include <limits.h>
8
9#include <dirent.h>
10#include <fcntl.h>
11#include <sys/mman.h>
12#include <sys/stat.h>
13#include <unistd.h>
14#include <stdint.h>
15
16/* builtin charmaps */
17#include "charmaps.h"
18
19/* only 0-7 are valid as dest charset */
20#define UTF_16BE 000
21#define UTF_16LE 001
22#define UTF_32BE 002
23#define UTF_32LE 003
24#define WCHAR_T 004
25#define UTF_8 005
26#define US_ASCII 006
27#define LATIN_1 007
28
29/* additional charsets with algorithmic conversion */
30#define LATIN_9 010
31#define TIS_620 011
32#define JIS_0201 012
33
34/* some programs like php need this */
35int _libiconv_version = _LIBICONV_VERSION;
36
37/* these must match the constants above */
38static const unsigned char charsets[] =
39    "\005" "UTF-8" "\0"
40    "\004" "WCHAR_T" "\0"
41    "\000" "UTF-16BE" "\0"
42    "\001" "UTF-16LE" "\0"
43    "\002" "UTF-32BE" "\0"
44    "\003" "UTF-32LE" "\0"
45    "\006" "ASCII" "\0"
46    "\006" "US-ASCII" "\0"
47    "\007" "ISO-8859-1" "\0"
48    "\007" "LATIN1" "\0"
49    "\010" "ISO-8859-15""\0"
50    "\010" "LATIN9" "\0"
51    "\011" "ISO-8859-11""\0"
52    "\011" "TIS-620" "\0"
53    "\012" "JIS-0201" "\0"
54    "\377";
55
56/* separate identifiers for sbcs/dbcs/etc map type */
57#define UCS2_8BIT 000
58#define UCS3_8BIT 001
59#define EUC 002
60#define EUC_TW 003
61#define SHIFT_JIS 004
62#define BIG5 005
63#define GBK 006
64
65/* FIXME: these are not implemented yet
66// EUC: A1-FE A1-FE
67// GBK: 81-FE 40-7E,80-FE
68// Big5: A1-FE 40-7E,A1-FE
69*/
70
71static const unsigned short maplen[] = {
72    [UCS2_8BIT] = 4+ 2* 128,
73    [UCS3_8BIT] = 4+ 3* 128,
74    [EUC] = 4+ 2* 94*94,
75    [SHIFT_JIS] = 4+ 2* 94*94,
76    [BIG5] = 4+ 2* 94*157,
77    [GBK] = 4+ 2* 126*190,
78    [EUC_TW] = 4+ 2* 2*94*94,
79};
80
81static int find_charmap(const char *name)
82{
83    int i;
84    for (i = 0; i < (sizeof(charmaps) / sizeof(charmaps[0])); i++)
85        if (!strcasecmp(charmaps[i].name, name))
86            return i;
87    return -1;
88}
89
90static int find_charset(const char *name)
91{
92    const unsigned char *s;
93    for (s=charsets; *s<0xff && strcasecmp(s+1, name); s+=strlen(s)+1);
94    return *s;
95}
96
97iconv_t iconv_open(const char *to, const char *from)
98{
99    unsigned f, t;
100    int m;
101
102    if ((t = find_charset(to)) > 8)
103        return -1;
104
105    if ((f = find_charset(from)) < 255)
106        return 0 | (t<<1) | (f<<8);
107
108    if ((m = find_charmap(from)) > -1)
109        return 1 | (t<<1) | (m<<8);
110
111    return -1;
112}
113
114int iconv_close(iconv_t cd)
115{
116    return 0;
117}
118
119static inline wchar_t get_16(const unsigned char *s, int endian)
120{
121    endian &= 1;
122    return s[endian]<<8 | s[endian^1];
123}
124
125static inline void put_16(unsigned char *s, wchar_t c, int endian)
126{
127    endian &= 1;
128    s[endian] = c>>8;
129    s[endian^1] = c;
130}
131
132static inline int utf8enc_wchar(char *outb, wchar_t c)
133{
134    if (c <= 0x7F) {
135        *outb = c;
136        return 1;
137    }
138    else if (c <= 0x7FF) {
139        *outb++ = ((c >> 6) & 0x1F) | 0xC0;
140        *outb++ = ( c & 0x3F) | 0x80;
141        return 2;
142    }
143    else if (c <= 0xFFFF) {
144        *outb++ = ((c >> 12) & 0x0F) | 0xE0;
145        *outb++ = ((c >> 6) & 0x3F) | 0x80;
146        *outb++ = ( c & 0x3F) | 0x80;
147        return 3;
148    }
149    else if (c <= 0x10FFFF) {
150        *outb++ = ((c >> 18) & 0x07) | 0xF0;
151        *outb++ = ((c >> 12) & 0x3F) | 0x80;
152        *outb++ = ((c >> 6) & 0x3F) | 0x80;
153        *outb++ = ( c & 0x3F) | 0x80;
154        return 4;
155    }
156    else {
157        *outb++ = '?';
158        return 1;
159    }
160}
161
162static inline int utf8seq_is_overlong(char *s, int n)
163{
164    switch (n)
165    {
166    case 2:
167        /* 1100000x (10xxxxxx) */
168        return (((*s >> 1) == 0x60) &&
169                ((*(s+1) >> 6) == 0x02));
170
171    case 3:
172        /* 11100000 100xxxxx (10xxxxxx) */
173        return ((*s == 0xE0) &&
174                ((*(s+1) >> 5) == 0x04) &&
175                ((*(s+2) >> 6) == 0x02));
176
177    case 4:
178        /* 11110000 1000xxxx (10xxxxxx 10xxxxxx) */
179        return ((*s == 0xF0) &&
180                ((*(s+1) >> 4) == 0x08) &&
181                ((*(s+2) >> 6) == 0x02) &&
182                ((*(s+3) >> 6) == 0x02));
183    }
184
185    return 0;
186}
187
188static inline int utf8seq_is_surrogate(char *s, int n)
189{
190    return ((n == 3) && (*s == 0xED) && (*(s+1) >= 0xA0) && (*(s+1) <= 0xBF));
191}
192
193static inline int utf8seq_is_illegal(char *s, int n)
194{
195    return ((n == 3) && (*s == 0xEF) && (*(s+1) == 0xBF) &&
196            (*(s+2) >= 0xBE) && (*(s+2) <= 0xBF));
197}
198
199static inline int utf8dec_wchar(wchar_t *c, unsigned char *in, size_t inb)
200{
201    int i;
202    int n = -1;
203
204    /* trivial char */
205    if (*in <= 0x7F) {
206        *c = *in;
207        return 1;
208    }
209
210    /* find utf8 sequence length */
211    if ((*in & 0xE0) == 0xC0) n = 2;
212    else if ((*in & 0xF0) == 0xE0) n = 3;
213    else if ((*in & 0xF8) == 0xF0) n = 4;
214    else if ((*in & 0xFC) == 0xF8) n = 5;
215    else if ((*in & 0xFE) == 0xFC) n = 6;
216
217    /* starved? */
218    if (n > inb)
219        return -2;
220
221    /* decode ... */
222    if (n > 1 && n < 5) {
223        /* reject invalid sequences */
224        if (utf8seq_is_overlong(in, n) ||
225            utf8seq_is_surrogate(in, n) ||
226            utf8seq_is_illegal(in, n))
227            return -1;
228
229        /* decode ... */
230        *c = (char)(*in++ & (0x7F >> n));
231
232        for (i = 1; i < n; i++) {
233            /* illegal continuation byte */
234            if (*in < 0x80 || *in > 0xBF)
235                return -1;
236
237            *c = (*c << 6) | (*in++ & 0x3F);
238        }
239
240        return n;
241    }
242
243    /* unmapped sequence (> 4) */
244    return -1;
245}
246
247static inline char latin9_translit(wchar_t c)
248{
249    /* a number of trivial iso-8859-15 <> utf-8 transliterations */
250    switch (c) {
251    case 0x20AC: return 0xA4; /* Euro */
252    case 0x0160: return 0xA6; /* S caron */
253    case 0x0161: return 0xA8; /* s caron */
254    case 0x017D: return 0xB4; /* Z caron */
255    case 0x017E: return 0xB8; /* z caron */
256    case 0x0152: return 0xBC; /* OE */
257    case 0x0153: return 0xBD; /* oe */
258    case 0x0178: return 0xBE; /* Y diaeresis */
259    default: return '?';
260    }
261}
262
263size_t iconv(iconv_t cd, char **in, size_t *inb, char **out, size_t *outb)
264{
265    size_t x=0;
266    unsigned char to = (cd>>1)&127;
267    unsigned char from = 255;
268    const unsigned char *map = 0;
269    char tmp[MB_LEN_MAX];
270    wchar_t c, d;
271    size_t k, l;
272    int err;
273
274    if (!in || !*in || !*inb) return 0;
275
276    if (cd & 1)
277        map = charmaps[cd>>8].map;
278    else
279        from = cd>>8;
280
281    for (; *inb; *in+=l, *inb-=l) {
282        c = *(unsigned char *)*in;
283        l = 1;
284        if (from >= UTF_8 && c < 0x80) goto charok;
285        switch (from) {
286        case WCHAR_T:
287            l = sizeof(wchar_t);
288            if (*inb < l) goto starved;
289            c = *(wchar_t *)*in;
290            break;
291        case UTF_8:
292            l = utf8dec_wchar(&c, *in, *inb);
293            if (!l) l++;
294            else if (l == (size_t)-1) goto ilseq;
295            else if (l == (size_t)-2) goto starved;
296            break;
297        case US_ASCII:
298            goto ilseq;
299        case LATIN_9:
300            if ((unsigned)c - 0xa4 <= 0xbe - 0xa4) {
301                static const unsigned char map[] = {
302                    0, 0x60, 0, 0x61, 0, 0, 0, 0, 0, 0, 0,
303                    0, 0, 0, 0, 0x7d, 0, 0, 0, 0x7e, 0, 0, 0,
304                    0x52, 0x53, 0x78
305                };
306                if (c == 0xa4) c = 0x20ac;
307                else if (map[c-0xa5]) c = 0x100 | map[c-0xa5];
308            }
309        case LATIN_1:
310            goto charok;
311        case TIS_620:
312            if (c >= 0xa1) c += 0x0e01-0xa1;
313            goto charok;
314        case JIS_0201:
315            if (c >= 0xa1) {
316                if (c <= 0xdf) c += 0xff61-0xa1;
317                else goto ilseq;
318            }
319            goto charok;
320        case UTF_16BE:
321        case UTF_16LE:
322            l = 2;
323            if (*inb < 2) goto starved;
324            c = get_16(*in, from);
325            if ((unsigned)(c-0xdc00) < 0x400) goto ilseq;
326            if ((unsigned)(c-0xd800) < 0x400) {
327                l = 4;
328                if (*inb < 4) goto starved;
329                d = get_16(*in + 2, from);
330                if ((unsigned)(c-0xdc00) >= 0x400) goto ilseq;
331                c = ((c-0xd800)<<10) | (d-0xdc00);
332            }
333            break;
334        case UTF_32BE:
335        case UTF_32LE:
336            l = 4;
337            if (*inb < 4) goto starved;
338            // FIXME
339            // c = get_32(*in, from);
340            break;
341        default:
342            /* only support ascii supersets */
343            if (c < 0x80) break;
344            switch (map[0]) {
345            case UCS2_8BIT:
346                c -= 0x80;
347                break;
348            case EUC:
349                if ((unsigned)c - 0xa1 >= 94) goto ilseq;
350                if ((unsigned)in[0][1] - 0xa1 >= 94) goto ilseq;
351                c = (c-0xa1)*94 + (in[0][1]-0xa1);
352                l = 2;
353                break;
354            case SHIFT_JIS:
355                if ((unsigned)c - 0xa1 <= 0xdf-0xa1) {
356                    c += 0xff61-0xa1;
357                    goto charok;
358                }
359                // FIXME...
360                l = 2;
361                break;
362            default:
363                goto badf;
364            }
365            c = get_16(map + 4 + 2*c, 0);
366            if (c == 0xffff) goto ilseq;
367            goto charok;
368        }
369
370        if ((unsigned)c - 0xd800 < 0x800 || (unsigned)c >= 0x110000)
371            goto ilseq;
372charok:
373        switch (to) {
374        case WCHAR_T:
375            if (*outb < sizeof(wchar_t)) goto toobig;
376            *(wchar_t *)*out = c;
377            *out += sizeof(wchar_t);
378            *outb -= sizeof(wchar_t);
379            break;
380        case UTF_8:
381            if (*outb < 4) {
382                k = utf8enc_wchar(tmp, c);
383                if (*outb < k) goto toobig;
384                memcpy(*out, tmp, k);
385            } else k = utf8enc_wchar(*out, c);
386            *out += k;
387            *outb -= k;
388            break;
389        case US_ASCII:
390            if (c > 0x7f) c = 0xfffd;
391            /* fall thru and count replacement in latin1 case */
392        case LATIN_9:
393            if (c >= 0x100 && c != 0xfffd)
394                c = latin9_translit(c);
395            /* fall through */
396        case LATIN_1:
397            if (!*outb) goto toobig;
398            if (c < 0x100) **out = c;
399            else x++, **out = '*'; //FIXME: translit?
400            ++*out;
401            --*outb;
402            break;
403        case UTF_16BE:
404        case UTF_16LE:
405            if (c < 0x10000) {
406                if (*outb < 2) goto toobig;
407                put_16(*out, c, to);
408                *out += 2;
409                *outb -= 2;
410                break;
411            }
412            if (*outb < 4) goto toobig;
413            put_16(*out, (c>>10)|0xd800, to);
414            put_16(*out + 2, (c&0x3ff)|0xdc00, to);
415            *out += 4;
416            *outb -= 4;
417            break;
418        default:
419            goto badf;
420        }
421    }
422    return x;
423ilseq:
424    err = EILSEQ;
425    x = -1;
426    goto end;
427badf:
428    err = EBADF;
429    x = -1;
430    goto end;
431toobig:
432    err = E2BIG;
433    x = -1;
434    goto end;
435starved:
436    err = EINVAL;
437end:
438    errno = err;
439    return x;
440}
441

Archive Download this file

Branches:
backfire
history
master
release_2010-11-17
release_2010-12-14
release_2011-02-23
release_2011-05-28
release_2011-08-27
release_2011-11-13
release_2012-03-18
release_2012-04-09
release_2012-10-11
uclibc_nptl



interactive