summaryrefslogtreecommitdiffstats
path: root/source3/modules/charset_macosxfs.c
blob: baf2a0071cbc64fcf50ef4ad2330bddc61b23898 (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
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
/* 
   Unix SMB/CIFS implementation.
   Samba charset module for Mac OS X/Darwin
   Copyright (C) Benjamin Riefenstahl 2003
   
   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 3 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, see <http://www.gnu.org/licenses/>.
*/

/*
 * modules/charset_macosxfs.c
 *
 * A Samba charset module to use on Mac OS X/Darwin as the filesystem
 * and display encoding.
 *
 * Actually two implementations are provided here.  The default
 * implementation is based on the official CFString API.  The other is
 * based on internal CFString APIs as defined in the OpenDarwin
 * source.
 */

#include "includes.h"

/*
 * Include OS frameworks.  These are only needed in this module.
 */
#include <CoreFoundation/CFString.h>

/*
 * See if autoconf has found us the internal headers in some form.
 */
#if HAVE_COREFOUNDATION_CFSTRINGENCODINGCONVERTER_H
#	include <CoreFoundation/CFStringEncodingConverter.h>
#	include <CoreFoundation/CFUnicodePrecomposition.h>
#	define USE_INTERNAL_API 1
#elif HAVE_CFSTRINGENCODINGCONVERTER_H
#	include <CFStringEncodingConverter.h>
#	include <CFUnicodePrecomposition.h>
#	define USE_INTERNAL_API 1
#endif

/*
 * Compile time configuration: Do we want debug output?
 */
/* #define DEBUG_STRINGS 1 */

/*
 * A simple, but efficient memory provider for our buffers.
 */
static inline void *resize_buffer (void *buffer, size_t *size, size_t newsize)
{
	if (newsize > *size) {
		*size = newsize + 128;
		buffer = SMB_REALLOC(buffer, *size);
	}
	return buffer;
}

/*
 * While there is a version of OpenDarwin for intel, the usual case is
 * big-endian PPC.  So we need byte swapping to handle the
 * little-endian byte order of the network protocol.  We also need an
 * additional dynamic buffer to do this work for incoming data blocks,
 * because we have to consider the original data as constant.
 *
 * We abstract the differences away by providing a simple facade with
 * these functions/macros:
 *
 *	le_to_native(dst,src,len)
 *	native_to_le(cp,len)
 *	set_ucbuffer_with_le(buffer,bufsize,data,size)
 *	set_ucbuffer_with_le_copy(buffer,bufsize,data,size,reserve)
 */
#ifdef WORDS_BIGENDIAN

static inline void swap_bytes (char * dst, const char * src, size_t len)
{
	const char *srcend = src + len;
	while (src < srcend) {
		dst[0] = src[1];
		dst[1] = src[0];
		dst += 2;
		src += 2;
	}
}
static inline void swap_bytes_inplace (char * cp, size_t len)
{
	char temp;
	char *end = cp + len;
	while (cp  < end) {
		temp = cp[1];
		cp[1] = cp[0];
		cp[0] = temp;
		cp += 2;
	}
}

#define le_to_native(dst,src,len)	swap_bytes(dst,src,len)
#define native_to_le(cp,len)		swap_bytes_inplace(cp,len)
#define set_ucbuffer_with_le(buffer,bufsize,data,size) \
	set_ucbuffer_with_le_copy(buffer,bufsize,data,size,0)

#else	/* ! WORDS_BIGENDIAN */

#define le_to_native(dst,src,len)	memcpy(dst,src,len)
#define native_to_le(cp,len)		/* nothing */
#define	set_ucbuffer_with_le(buffer,bufsize,data,size) \
	(((void)(bufsize)),(UniChar*)(data))

#endif

static inline UniChar *set_ucbuffer_with_le_copy (
	UniChar *buffer, size_t *bufsize,
	const void *data, size_t size, size_t reserve)
{
	buffer = resize_buffer(buffer, bufsize, size+reserve);
	le_to_native((char*)buffer,data,size);
	return buffer;
}


/*
 * A simple hexdump function for debugging error conditions.
 */
#define	debug_out(s)	DEBUG(0,(s))

#ifdef DEBUG_STRINGS

static void hexdump( const char * label, const char * s, size_t len )
{
	size_t restlen = len;
	debug_out("<<<<<<<\n");
	debug_out(label);
	debug_out("\n");
	while (restlen > 0) {
		char line[100];
		size_t i, j;
		char * d = line;
#undef sprintf
		d += sprintf(d, "%04X ", (unsigned)(len-restlen));
		*d++ = ' ';
		for( i = 0; i<restlen && i<8; ++i ) {
			d += sprintf(d, "%02X ", ((unsigned)s[i]) & 0xFF);
		}
		for( j = i; j<8; ++j ) {
			d += sprintf(d, "   ");
		}
		*d++ = ' ';
		for( i = 8; i<restlen && i<16; ++i ) {
			d += sprintf(d, "%02X ", ((unsigned)s[i]) & 0xFF);
		}
		for( j = i; j<16; ++j ) {
			d += sprintf(d, "   ");
		}
		*d++ = ' ';
		for( i = 0; i<restlen && i<16; ++i ) {
			if(s[i] < ' ' || s[i] >= 0x7F || !isprint(s[i]))
				*d++ = '.';
			else
				*d++ = s[i];
		}
		*d++ = '\n';
		*d = 0;
		restlen -= i;
		s += i;
		debug_out(line);
	}
	debug_out(">>>>>>>\n");
}

#else	/* !DEBUG_STRINGS */

#define hexdump(label,s,len) /* nothing */

#endif


#if !USE_INTERNAL_API

/*
 * An implementation based on documented Mac OS X APIs.
 *
 * This does a certain amount of memory management, creating and
 * manipulating CFString objects.  We try to minimize the impact by
 * keeping those objects around and re-using them.  We also use
 * external backing store for the CFStrings where this is possible and
 * benficial.
 *
 * The Unicode normalizations forms available at this level are
 * generic, not specifically for the file system.  So they may not be
 * perfect fits.
 */
static size_t macosxfs_encoding_pull(
	void *cd,				/* Encoder handle */
	char **inbuf, size_t *inbytesleft,	/* Script string */
	char **outbuf, size_t *outbytesleft)	/* UTF-16-LE string */
{
	static const int script_code = kCFStringEncodingUTF8;
	static CFMutableStringRef cfstring = NULL;
	size_t outsize;
	CFRange range;

	(void) cd; /* UNUSED */

	if (0 == *inbytesleft) {
		return 0;
	}

	if (NULL == cfstring) {
		/*
		 * A version with an external backing store as in the
		 * push function should have been more efficient, but
		 * testing shows, that it is actually slower (!).
		 * Maybe kCFAllocatorDefault gets shortcut evaluation
		 * internally, while kCFAllocatorNull doesn't.
		 */
		cfstring = CFStringCreateMutable(kCFAllocatorDefault,0);
	}

	/*
	 * Three methods of appending to a CFString, choose the most
	 * efficient.
	 */
	if (0 == (*inbuf)[*inbytesleft-1]) {
		CFStringAppendCString(cfstring, *inbuf, script_code);
	} else if (*inbytesleft <= 255) {
		Str255 buffer;
		buffer[0] = *inbytesleft;
		memcpy(buffer+1, *inbuf, buffer[0]);
		CFStringAppendPascalString(cfstring, buffer, script_code);
	} else {
		/*
		 * We would like to use a fixed buffer and a loop
		 * here, but than we can't garantee that the input is
		 * well-formed UTF-8, as we are supposed to do.
		 */
		static char *buffer = NULL;
		static size_t buflen = 0;
		buffer = resize_buffer(buffer, &buflen, *inbytesleft+1);
		memcpy(buffer, *inbuf, *inbytesleft);
		buffer[*inbytesleft] = 0;
		CFStringAppendCString(cfstring, *inbuf, script_code);
	}

	/*
	 * Compose characters, using the non-canonical composition
	 * form.
	 */
	CFStringNormalize(cfstring, kCFStringNormalizationFormC);

	outsize = CFStringGetLength(cfstring);
	range = CFRangeMake(0,outsize);

	if (outsize == 0) {
		/*
		 * HACK: smbd/mangle_hash2.c:is_legal_name() expects
		 * errors here.  That function will always pass 2
		 * characters.  smbd/open.c:check_for_pipe() cuts a
		 * patchname to 10 characters blindly.  Suppress the
		 * debug output in those cases.
		 */
		if(2 != *inbytesleft && 10 != *inbytesleft) {
			debug_out("String conversion: "
				  "An unknown error occurred\n");
			hexdump("UTF8->UTF16LE (old) input",
				*inbuf, *inbytesleft);
		}
		errno = EILSEQ; /* Not sure, but this is what we have
				 * actually seen. */
		return -1;
	}
	if (outsize*2 > *outbytesleft) {
		CFStringDelete(cfstring, range);
		debug_out("String conversion: "
			  "Output buffer too small\n");
		hexdump("UTF8->UTF16LE (old) input",
			*inbuf, *inbytesleft);
		errno = E2BIG;
		return -1;
	}

        CFStringGetCharacters(cfstring, range, (UniChar*)*outbuf);
	CFStringDelete(cfstring, range);

	native_to_le(*outbuf, outsize*2);

	/*
	 * Add a converted null byte, if the CFString conversions
	 * prevented that until now.
	 */
	if (0 == (*inbuf)[*inbytesleft-1] && 
	    (0 != (*outbuf)[outsize*2-1] || 0 != (*outbuf)[outsize*2-2])) {

		if ((outsize*2+2) > *outbytesleft) {
			debug_out("String conversion: "
				  "Output buffer too small\n");
			hexdump("UTF8->UTF16LE (old) input",
				*inbuf, *inbytesleft);
			errno = E2BIG;
			return -1;
		}

		(*outbuf)[outsize*2] = (*outbuf)[outsize*2+1] = 0;
		outsize += 2;
	}

	*inbuf += *inbytesleft;
	*inbytesleft = 0;
	*outbuf += outsize*2;
	*outbytesleft -= outsize*2;

	return 0;
}

static size_t macosxfs_encoding_push(
	void *cd,				/* Encoder handle */
	char **inbuf, size_t *inbytesleft,	/* UTF-16-LE string */
	char **outbuf, size_t *outbytesleft)	/* Script string */
{
	static const int script_code = kCFStringEncodingUTF8;
	static CFMutableStringRef cfstring = NULL;
	static UniChar *buffer = NULL;
	static size_t buflen = 0;
	CFIndex outsize, cfsize, charsconverted;

	(void) cd; /* UNUSED */

	if (0 == *inbytesleft) {
		return 0;
	}

	/*
	 * We need a buffer that can hold 4 times the original data,
	 * because that is the theoretical maximum that decomposition
	 * can create currently (in Unicode 4.0).
	 */
	buffer = set_ucbuffer_with_le_copy(
		buffer, &buflen, *inbuf, *inbytesleft, 3 * *inbytesleft);

	if (NULL == cfstring) {
		cfstring = CFStringCreateMutableWithExternalCharactersNoCopy(
			kCFAllocatorDefault,
			buffer, *inbytesleft/2, buflen/2,
			kCFAllocatorNull);
	} else {
		CFStringSetExternalCharactersNoCopy(
			cfstring,
			buffer, *inbytesleft/2, buflen/2);
	}

	/*
	 * Decompose characters, using the non-canonical decomposition
	 * form.
	 *
	 * NB: This isn't exactly what HFS+ wants (see note on
	 * kCFStringEncodingUseHFSPlusCanonical in
	 * CFStringEncodingConverter.h), but AFAIK it's the best that
	 * the official API can do.
	 */
	CFStringNormalize(cfstring, kCFStringNormalizationFormD);

	cfsize = CFStringGetLength(cfstring);
	charsconverted = CFStringGetBytes(
		cfstring, CFRangeMake(0,cfsize),
		script_code, 0, False,
		*outbuf, *outbytesleft, &outsize);

	if (0 == charsconverted) {
		debug_out("String conversion: "
			  "Buffer too small or not convertable\n");
		hexdump("UTF16LE->UTF8 (old) input",
			*inbuf, *inbytesleft);
		errno = EILSEQ; /* Probably more likely. */
		return -1;
	}

	/*
	 * Add a converted null byte, if the CFString conversions
	 * prevented that until now.
	 */
	if (0 == (*inbuf)[*inbytesleft-1] && 0 == (*inbuf)[*inbytesleft-2] &&
	    (0 != (*outbuf)[outsize-1])) {

		if (((size_t)outsize+1) > *outbytesleft) {
			debug_out("String conversion: "
				  "Output buffer too small\n");
			hexdump("UTF16LE->UTF8 (old) input",
				*inbuf, *inbytesleft);
			errno = E2BIG;
			return -1;
		}

		(*outbuf)[outsize] = 0;
		++outsize;
	}

	*inbuf += *inbytesleft;
	*inbytesleft = 0;
	*outbuf += outsize;
	*outbytesleft -= outsize;

	return 0;
}

#else /* USE_INTERNAL_API */

/*
 * An implementation based on internal code as known from the
 * OpenDarwin CVS.
 *
 * This code doesn't need much memory management because it uses
 * functions that operate on the raw memory directly.
 *
 * The push routine here is faster and more compatible with HFS+ than
 * the other implementation above.  The pull routine is only faster
 * for some strings, slightly slower for others.  The pull routine
 * looses because it has to iterate over the data twice, once to
 * decode UTF-8 and than to do the character composition required by
 * Windows.
 */
static size_t macosxfs_encoding_pull(
	void *cd,				/* Encoder handle */
	char **inbuf, size_t *inbytesleft,	/* Script string */
	char **outbuf, size_t *outbytesleft)	/* UTF-16-LE string */
{
	static const int script_code = kCFStringEncodingUTF8;
	UInt32 srcCharsUsed = 0;
	UInt32 dstCharsUsed = 0;
	UInt32 result;
	uint32_t dstDecomposedUsed = 0;
	uint32_t dstPrecomposedUsed = 0;

	(void) cd; /* UNUSED */

	if (0 == *inbytesleft) {
		return 0;
	}

        result = CFStringEncodingBytesToUnicode(
		script_code, kCFStringEncodingComposeCombinings,
		*inbuf, *inbytesleft, &srcCharsUsed,
		(UniChar*)*outbuf, *outbytesleft, &dstCharsUsed);

	switch(result) {
	case kCFStringEncodingConversionSuccess:
		if (*inbytesleft == srcCharsUsed)
			break;
		else
			; /*fall through*/
	case kCFStringEncodingInsufficientOutputBufferLength:
		debug_out("String conversion: "
			  "Output buffer too small\n");
		hexdump("UTF8->UTF16LE (new) input",
			*inbuf, *inbytesleft);
		errno = E2BIG;
		return -1;
	case kCFStringEncodingInvalidInputStream:
		/*
		 * HACK: smbd/mangle_hash2.c:is_legal_name() expects
		 * errors here.  That function will always pass 2
		 * characters.  smbd/open.c:check_for_pipe() cuts a
		 * patchname to 10 characters blindly.  Suppress the
		 * debug output in those cases.
		 */
		if(2 != *inbytesleft && 10 != *inbytesleft) {
			debug_out("String conversion: "
				  "Invalid input sequence\n");
			hexdump("UTF8->UTF16LE (new) input",
				*inbuf, *inbytesleft);
		}
		errno = EILSEQ;
		return -1;
	case kCFStringEncodingConverterUnavailable:
		debug_out("String conversion: "
			  "Unknown encoding\n");
		hexdump("UTF8->UTF16LE (new) input",
			*inbuf, *inbytesleft);
		errno = EINVAL;
		return -1;
	}

	/*
	 * It doesn't look like CFStringEncodingBytesToUnicode() can
	 * produce precomposed characters (flags=ComposeCombinings
	 * doesn't do it), so we need another pass over the data here.
	 * We can do this in-place, as the string can only get
	 * shorter.
	 *
	 * (Actually in theory there should be an internal
	 * decomposition and reordering before the actual composition
	 * step.  But we should be able to rely on that we always get
	 * fully decomposed strings for input, so this can't create
	 * problems in reality.)
	 */
	CFUniCharPrecompose(
		(const UTF16Char *)*outbuf, dstCharsUsed, &dstDecomposedUsed,
		(UTF16Char *)*outbuf, dstCharsUsed, &dstPrecomposedUsed);

	native_to_le(*outbuf, dstPrecomposedUsed*2);

	*inbuf += srcCharsUsed;
	*inbytesleft -= srcCharsUsed;
	*outbuf += dstPrecomposedUsed*2;
	*outbytesleft -= dstPrecomposedUsed*2;

	return 0;
}

static size_t macosxfs_encoding_push(
	void *cd,				/* Encoder handle */
	char **inbuf, size_t *inbytesleft,	/* UTF-16-LE string */
	char **outbuf, size_t *outbytesleft)	/* Script string */
{
	static const int script_code = kCFStringEncodingUTF8;
	static UniChar *buffer = NULL;
	static size_t buflen = 0;
	UInt32 srcCharsUsed=0, dstCharsUsed=0, result;

	(void) cd; /* UNUSED */

	if (0 == *inbytesleft) {
		return 0;
	}

	buffer = set_ucbuffer_with_le(
		buffer, &buflen, *inbuf, *inbytesleft);

	result = CFStringEncodingUnicodeToBytes(
		script_code, kCFStringEncodingUseHFSPlusCanonical,
		buffer, *inbytesleft/2, &srcCharsUsed,
		*outbuf, *outbytesleft, &dstCharsUsed);

	switch(result) {
	case kCFStringEncodingConversionSuccess:
		if (*inbytesleft/2 == srcCharsUsed)
			break;
		else
			; /*fall through*/
	case kCFStringEncodingInsufficientOutputBufferLength:
		debug_out("String conversion: "
			  "Output buffer too small\n");
		hexdump("UTF16LE->UTF8 (new) input",
			*inbuf, *inbytesleft);
		errno = E2BIG;
		return -1;
	case kCFStringEncodingInvalidInputStream:
		/*
		 * HACK: smbd/open.c:check_for_pipe():is_legal_name()
		 * cuts a pathname to 10 characters blindly.  Suppress
		 * the debug output in those cases.
		 */
		if(10 != *inbytesleft) {
			debug_out("String conversion: "
				  "Invalid input sequence\n");
			hexdump("UTF16LE->UTF8 (new) input",
				*inbuf, *inbytesleft);
		}
		errno = EILSEQ;
		return -1;
	case kCFStringEncodingConverterUnavailable:
		debug_out("String conversion: "
			  "Unknown encoding\n");
		hexdump("UTF16LE->UTF8 (new) input",
			*inbuf, *inbytesleft);
		errno = EINVAL;
		return -1;
	}

	*inbuf += srcCharsUsed*2;
	*inbytesleft -= srcCharsUsed*2;
	*outbuf += dstCharsUsed;
	*outbytesleft -= dstCharsUsed;

	return 0;
}

#endif /* USE_INTERNAL_API */

/*
 * For initialization, actually install the encoding as "macosxfs".
 */
static struct charset_functions macosxfs_encoding_functions = {
	"MACOSXFS", macosxfs_encoding_pull, macosxfs_encoding_push
};

NTSTATUS charset_macosxfs_init(void)
{
	return smb_register_charset(&macosxfs_encoding_functions);
}

/* eof */