summaryrefslogtreecommitdiff
path: root/source3/lib/iconv.c
blob: 0c722e71dd4b308be5331117dad97c18e806b713 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
/* 
   Unix SMB/Netbios implementation.
   Version 3.0
   minimal iconv implementation
   Copyright (C) Andrew Tridgell 2001
   
   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.
   
   You should have received a copy of the GNU General Public License
   along with this program; if not, write to the Free Software
   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/

#include "includes.h"

static size_t ascii_pull(char **, size_t *, char **, size_t *);
static size_t ascii_push(char **, size_t *, char **, size_t *);
static size_t  utf8_pull(char **, size_t *, char **, size_t *);
static size_t  utf8_push(char **, size_t *, char **, size_t *);
static size_t weird_pull(char **, size_t *, char **, size_t *);
static size_t weird_push(char **, size_t *, char **, size_t *);
static size_t iconv_copy(char **, size_t *, char **, size_t *);

/*
  for each charset we have a function that pulls from that charset to 
  a ucs2 buffer, and a function that pushes to a ucs2 buffer 
*/
static struct {
	char *name;
	size_t (*pull)(char **inbuf, size_t *inbytesleft,
		       char **outbuf, size_t *outbytesleft);
	size_t (*push)(char **inbuf, size_t *inbytesleft,
		       char **outbuf, size_t *outbytesleft);
} charsets[] = {
	{"UCS2",  iconv_copy, iconv_copy},
	{"UTF8",   utf8_pull,  utf8_push},
	{"ASCII", ascii_pull, ascii_push},
	{"WEIRD", weird_pull, weird_push},
	{NULL, NULL, NULL}
};

/*
  this is a simple portable iconv() implementaion. It only knows about
  a very small number of character sets - just enough that Samba works
  on systems that don't have iconv
 */
size_t smb_iconv(smb_iconv_t cd, 
		 char **inbuf, size_t *inbytesleft,
		 char **outbuf, size_t *outbytesleft)
{
	char cvtbuf[2048];
	char *bufp = cvtbuf;
	size_t bufsize;

#ifdef HAVE_NATIVE_ICONV
	if (cd->cd) {
		size_t ret;
		ret = iconv(cd->cd, inbuf, inbytesleft, outbuf, outbytesleft);

		/* if there was an error then reset the internal state,
		   this ensures that we don't have a shift state remaining for
		   character sets like SJIS */
		if (ret == (size_t)-1) {
			iconv(cd->cd, NULL, NULL, NULL, NULL);
		}
		return ret;
	}
#endif

	/* in most cases we can go direct */
	if (cd->direct) {
		return cd->direct(inbuf, inbytesleft, outbuf, outbytesleft);
	}

	/* otherwise we have to do it chunks at a time */
	while (*inbytesleft > 0) {
		bufp = cvtbuf;
		bufsize = sizeof(cvtbuf);
		if (cd->pull(inbuf, inbytesleft, &bufp, &bufsize) == -1 &&
		    errno != E2BIG) return -1;

		bufp = cvtbuf;
		bufsize = sizeof(cvtbuf) - bufsize;
		if (cd->push(&bufp, &bufsize, outbuf, outbytesleft) == -1) return -1;
	}

	return 0;
}

/*
  simple iconv_open() wrapper
 */
smb_iconv_t smb_iconv_open(const char *tocode, const char *fromcode)
{
	smb_iconv_t ret;
	int from, to;
#ifdef HAVE_NATIVE_ICONV
	iconv_t cd = NULL;
#endif

	for (from=0; charsets[from].name; from++) {
		if (strcasecmp(charsets[from].name, fromcode) == 0) break;
	}
	for (to=0; charsets[to].name; to++) {
		if (strcasecmp(charsets[to].name, tocode) == 0) break;
	}

	if (!charsets[from].name || !charsets[to].name) {
#ifdef HAVE_NATIVE_ICONV
		/* its not builtin - see if iconv() has it */
		cd = iconv_open(tocode, fromcode);
		if (!cd)
#endif
		{
			errno = EINVAL;
			return (smb_iconv_t)-1;
		}
	}

	ret = (smb_iconv_t)malloc(sizeof(*ret));
	if (!ret) {
		errno = ENOMEM;
		return (smb_iconv_t)-1;
	}
	memset(ret, 0, sizeof(*ret));

#ifdef HAVE_NATIVE_ICONV
	/* see if we will be using the native iconv */
	if (cd) {
		ret->cd = cd;
		return ret;
	}
#endif

	/* check for the simplest null conversion */
	if (from == to) {
		ret->direct = iconv_copy;
		return ret;
	}

	/* check for conversion to/from ucs2 */
	if (from == 0) {
		ret->direct = charsets[to].push;
		return ret;
	}
	if (to == 0) {
		ret->direct = charsets[from].pull;
		return ret;
	}

	/* the general case has to go via a buffer */
	ret->pull = charsets[from].pull;
	ret->push = charsets[to].push;
	return ret;
}

/*
  simple iconv_close() wrapper
*/
int smb_iconv_close (smb_iconv_t cd)
{
#ifdef HAVE_NATIVE_ICONV
	if (cd->cd) {
		iconv_close(cd->cd);
	}
#endif
	memset(cd, 0, sizeof(*cd));
	free(cd);
	return 0;
}


/**********************************************************************
 the following functions implement the builtin character sets in Samba
 and also the "test" character sets that are designed to test
 multi-byte character set support for english users
***********************************************************************/

static size_t ascii_pull(char **inbuf, size_t *inbytesleft,
			 char **outbuf, size_t *outbytesleft)
{
	while (*inbytesleft >= 1 && *outbytesleft >= 2) {
		(*outbuf)[0] = (*inbuf)[0];
		(*outbuf)[1] = 0;
		(*inbytesleft)  -= 1;
		(*outbytesleft) -= 2;
		(*inbuf)  += 1;
		(*outbuf) += 2;
	}

	if (*inbytesleft > 0) {
		errno = E2BIG;
		return -1;
	}
	
	return 0;
}

static size_t ascii_push(char **inbuf, size_t *inbytesleft,
			 char **outbuf, size_t *outbytesleft)
{
	int ir_count=0;

	while (*inbytesleft >= 2 && *outbytesleft >= 1) {
		(*outbuf)[0] = (*inbuf)[0];
		if ((*inbuf)[1]) ir_count++;
		(*inbytesleft)  -= 2;
		(*outbytesleft) -= 1;
		(*inbuf)  += 2;
		(*outbuf) += 1;
	}

	if (*inbytesleft == 1) {
		errno = EINVAL;
		return -1;
	}

	if (*inbytesleft > 1) {
		errno = E2BIG;
		return -1;
	}
	
	return ir_count;
}


/* the "weird" character set is very useful for testing multi-byte
   support and finding bugs. Don't use on a production system! 
*/
static struct {
	char from;
	char *to;
	int len;
} weird_table[] = {
	{'q', "^q^", 3},
	{'Q', "^Q^", 3},
	{0, NULL}
};

static size_t weird_pull(char **inbuf, size_t *inbytesleft,
			 char **outbuf, size_t *outbytesleft)
{
	while (*inbytesleft >= 1 && *outbytesleft >= 2) {
		int i;
		int done = 0;
		for (i=0;weird_table[i].from;i++) {
			if (strncmp((*inbuf), 
				    weird_table[i].to, 
				    weird_table[i].len) == 0) {
				if (*inbytesleft < weird_table[i].len) {
					DEBUG(0,("ERROR: truncated weird string\n"));
					/* smb_panic("weird_pull"); */

				} else {
					(*outbuf)[0] = weird_table[i].from;
					(*outbuf)[1] = 0;
					(*inbytesleft)  -= weird_table[i].len;
					(*outbytesleft) -= 2;
					(*inbuf)  += weird_table[i].len;
					(*outbuf) += 2;
					done = 1;
					break;
				}
			}
		}
		if (done) continue;
		(*outbuf)[0] = (*inbuf)[0];
		(*outbuf)[1] = 0;
		(*inbytesleft)  -= 1;
		(*outbytesleft) -= 2;
		(*inbuf)  += 1;
		(*outbuf) += 2;
	}

	if (*inbytesleft > 0) {
		errno = E2BIG;
		return -1;
	}
	
	return 0;
}

static size_t weird_push(char **inbuf, size_t *inbytesleft,
			 char **outbuf, size_t *outbytesleft)
{
	int ir_count=0;

	while (*inbytesleft >= 2 && *outbytesleft >= 1) {
		int i;
		int done=0;
		for (i=0;weird_table[i].from;i++) {
			if ((*inbuf)[0] == weird_table[i].from &&
			    (*inbuf)[1] == 0) {
				if (*outbytesleft < weird_table[i].len) {
					DEBUG(0,("No room for weird character\n"));
					/* smb_panic("weird_push"); */
				} else {
					memcpy(*outbuf, weird_table[i].to, 
					       weird_table[i].len);
					(*inbytesleft)  -= 2;
					(*outbytesleft) -= weird_table[i].len;
					(*inbuf)  += 2;
					(*outbuf) += weird_table[i].len;
					done = 1;
					break;
				}
			}
		}
		if (done) continue;

		(*outbuf)[0] = (*inbuf)[0];
		if ((*inbuf)[1]) ir_count++;
		(*inbytesleft)  -= 2;
		(*outbytesleft) -= 1;
		(*inbuf)  += 2;
		(*outbuf) += 1;
	}

	if (*inbytesleft == 1) {
		errno = EINVAL;
		return -1;
	}

	if (*inbytesleft > 1) {
		errno = E2BIG;
		return -1;
	}
	
	return ir_count;
}

static size_t iconv_copy(char **inbuf, size_t *inbytesleft,
			 char **outbuf, size_t *outbytesleft)
{
	int n;

	n = MIN(*inbytesleft, *outbytesleft);

	memmove(*outbuf, *inbuf, n);

	(*inbytesleft) -= n;
	(*outbytesleft) -= n;
	(*inbuf) += n;
	(*outbuf) += n;

	if (*inbytesleft > 0) {
		errno = E2BIG;
		return -1;
	}

	return 0;
}

static size_t utf8_pull(char **inbuf, size_t *inbytesleft,
			 char **outbuf, size_t *outbytesleft)
{
	while (*inbytesleft >= 1 && *outbytesleft >= 2) {
		unsigned char *c = (unsigned char *)*inbuf;
		unsigned char *uc = (unsigned char *)*outbuf;
		int len = 1;

		if ((c[0] & 0x80) == 0) {
			uc[0] = c[0];
			uc[1] = 0;
		} else if ((c[0] & 0xf0) == 0xe0) {
			if (*inbytesleft < 3) {
				DEBUG(0,("short utf8 char\n"));
				goto badseq;
			}
			uc[1] = ((c[0]&0xF)<<4) | ((c[1]>>2)&0xF);
			uc[0] = (c[1]<<6) | (c[2]&0x3f);
			len = 3;
		} else if ((c[0] & 0xe0) == 0xc0) {
			if (*inbytesleft < 2) {
				DEBUG(0,("short utf8 char\n"));
				goto badseq;
			}
			uc[1] = (c[0]>>2) & 0x7;
			uc[0] = (c[0]<<6) | (c[1]&0x3f);
			len = 2;
		}

		(*inbuf)  += len;
		(*inbytesleft)  -= len;
		(*outbytesleft) -= 2;
		(*outbuf) += 2;
	}

	if (*inbytesleft > 0) {
		errno = E2BIG;
		return -1;
	}
	
	return 0;

badseq:
	errno = EINVAL;
	return -1;
}

static size_t utf8_push(char **inbuf, size_t *inbytesleft,
			 char **outbuf, size_t *outbytesleft)
{
	while (*inbytesleft >= 2 && *outbytesleft >= 1) {
		unsigned char *c = (unsigned char *)*outbuf;
		unsigned char *uc = (unsigned char *)*inbuf;
		int len=1;

		if ((uc[1] & 0xf8) == 0xd8) {
			if (*outbytesleft < 3) {
				DEBUG(0,("short utf8 write\n"));
				goto toobig;
			}
			c[0] = 0xed;
			c[1] = 0x9f;
			c[2] = 0xbf;
			len = 3;
		} else if (uc[1] & 0xf8) {
			if (*outbytesleft < 3) {
				DEBUG(0,("short utf8 write\n"));
				goto toobig;
			}
			c[0] = 0xe0 | (uc[1]>>4);
			c[1] = 0x80 | ((uc[1]&0xF)<<2) | (uc[0]>>6);
			c[2] = 0x80 | (uc[0]&0x3f);
			len = 3;
		} else if (uc[1] | (uc[0] & 0x80)) {
			if (*outbytesleft < 2) {
				DEBUG(0,("short utf8 write\n"));
				goto toobig;
			}
			c[0] = 0xc0 | (uc[1]<<2) | (uc[0]>>6);
			c[1] = 0x80 | (uc[0]&0x3f);
			len = 2;
		} else {
			c[0] = uc[0];
		}


		(*outbuf)[0] = (*inbuf)[0];
		(*inbytesleft)  -= 2;
		(*outbytesleft) -= len;
		(*inbuf)  += 2;
		(*outbuf) += len;
	}

	if (*inbytesleft == 1) {
		errno = EINVAL;
		return -1;
	}

	if (*inbytesleft > 1) {
		errno = E2BIG;
		return -1;
	}
	
	return 0;

toobig:
	errno = E2BIG;
	return -1;
}