summaryrefslogtreecommitdiff
path: root/sal/osl/unx/file_url.cxx
blob: ddf2be4d8098cde96afa5690b57d364cfad87904 (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
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
 * This file is part of the LibreOffice project.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * This file incorporates work covered by the following license notice:
 *
 *   Licensed to the Apache Software Foundation (ASF) under one or more
 *   contributor license agreements. See the NOTICE file distributed
 *   with this work for additional information regarding copyright
 *   ownership. The ASF licenses this file to you under the Apache
 *   License, Version 2.0 (the "License"); you may not use this file
 *   except in compliance with the License. You may obtain a copy of
 *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
 */

#include "file_url.hxx"

#include "system.hxx"

#include <cassert>
#include <stdexcept>
#include <limits.h>
#include <errno.h>
#include <strings.h>
#include <unistd.h>

#include "osl/file.hxx"
#include <osl/security.hxx>
#include <osl/diagnose.h>
#include <osl/thread.h>
#include <osl/process.h>

#include <rtl/character.hxx>
#include <rtl/uri.h>
#include <rtl/uri.hxx>
#include <rtl/ustring.hxx>
#include <rtl/ustrbuf.h>
#include "rtl/textcvt.h"
#include <sal/log.hxx>

#include "file_error_transl.hxx"
#include "file_path_helper.hxx"

#include "uunxapi.hxx"

/***************************************************

 General note

 This file contains the part that handles File URLs.

 File URLs as scheme specific notion of URIs
 (RFC2396) may be handled platform independent, but
 will not in osl which is considered wrong.
 Future version of osl should handle File URLs this
 way. In rtl/uri there is already an URI parser etc.
 so this code should be consolidated.

 **************************************************/

using namespace osl;

namespace {

// A slightly modified version of Pchar in rtl/source/uri.c, but without
// encoding slashes:
const sal_Bool uriCharClass[128] = {
    false, false, false, false, false, false, false, false,
    false, false, false, false, false, false, false, false,
    false, false, false, false, false, false, false, false,
    false, false, false, false, false, false, false, false,
    false,  true, false, false,  true, false,  true,  true,  //  !"#$%&'
     true,  true,  true,  true,  true,  true,  true,  true,  // ()*+,-./
     true,  true,  true,  true,  true,  true,  true,  true,  // 01234567
     true,  true,  true, false, false,  true, false, false,  // 89:;<=>?
     true,  true,  true,  true,  true,  true,  true,  true,  // @ABCDEFG
     true,  true,  true,  true,  true,  true,  true,  true,  // HIJKLMNO
     true,  true,  true,  true,  true,  true,  true,  true,  // PQRSTUVW
     true,  true,  true, false, false, false, false,  true,  // XYZ[\]^_
    false,  true,  true,  true,  true,  true,  true,  true,  // `abcdefg
     true,  true,  true,  true,  true,  true,  true,  true,  // hijklmno
     true,  true,  true,  true,  true,  true,  true,  true,  // pqrstuvw
     true,  true,  true, false, false, false,  true, false}; // xyz{|}~

}

oslFileError SAL_CALL osl_getCanonicalName( rtl_uString* ustrFileURL, rtl_uString** pustrValidURL )
{
    OSL_FAIL("osl_getCanonicalName not implemented");

    rtl_uString_newFromString(pustrValidURL, ustrFileURL);
    return osl_File_E_None;
}

namespace {

oslFileError getSystemPathFromFileUrl(
    OUString const & url, OUString * path, bool resolveHome)
{
    assert(path != nullptr);
    // For compatibility with assumptions in other parts of the code base,
    // assume that anything starting with a slash is a system path instead of a
    // (relative) file URL (except if it starts with two slashes, in which case
    // it is a relative URL with an authority component):
    if (url.isEmpty()
        || (url[0] == '/' && (url.getLength() == 1 || url[1] != '/')))
    {
        return osl_File_E_INVAL;
    }
    // Check for non file scheme:
    sal_Int32 i = 0;
    if (rtl::isAsciiAlpha(url[0])) {
        for (sal_Int32 j = 1; j != url.getLength(); ++j) {
            auto c = url[j];
            if (c == ':') {
                if (rtl_ustr_ascii_compareIgnoreAsciiCase_WithLengths(
                        url.pData->buffer, j,
                        RTL_CONSTASCII_STRINGPARAM("file"))
                    != 0)
                {
                    return osl_File_E_INVAL;
                }
                i = j + 1;
                break;
            } else if (!rtl::isAsciiAlphanumeric(c) && c != '+' && c != '-'
                       && c != '.')
            {
                break;
            }
        }
    }
    // Handle query or fragment:
    if (url.indexOf('?', i) != -1 || url.indexOf('#', i) != -1) {
        return osl_File_E_INVAL;
    }
    // Handle authority:
    if (url.getLength() - i >= 2 && url[i] == '/' && url[i + 1] == '/') {
        i += 2;
        sal_Int32 j = url.indexOf('/', i);
        if (j == -1) {
            j = url.getLength();
        }
        if (j != i
            && (rtl_ustr_ascii_compareIgnoreAsciiCase_WithLengths(
                    url.pData->buffer + i, j - i,
                    RTL_CONSTASCII_STRINGPARAM("localhost"))
                != 0)
            && (rtl_ustr_ascii_compareIgnoreAsciiCase_WithLengths(
                    url.pData->buffer + i, j - i,
                    RTL_CONSTASCII_STRINGPARAM("127.0.0.1"))
                != 0))
        {
            return osl_File_E_INVAL;
        }
        i = j;
    }
    // Handle empty path:
    if (i == url.getLength()) {
        *path = "/";
        return osl_File_E_None;
    }
    // Path must not contain %2F:
    if (url.indexOf("%2F", i) != -1 || url.indexOf("%2f", i) != -1) {
        return osl_File_E_INVAL;
    }
    *path = rtl::Uri::decode(
        url.copy(i), rtl_UriDecodeWithCharset, RTL_TEXTENCODING_UTF8);
    // Path must not contain %2F:
    if (path->indexOf('\0') != -1) {
        return osl_File_E_INVAL;
    }
    // Handle ~ notation:
    if (resolveHome && path->getLength() >= 2 && (*path)[1] == '~') {
        sal_Int32 j = path->indexOf('/', 2);
        if (j == -1) {
            j = path->getLength();
        }
        if (j == 2) {
            OUString home;
            if (!osl::Security().getHomeDir(home)) {
                SAL_WARN("sal.file", "osl::Security::getHomeDir failed");
                return osl_File_E_INVAL;
            }
            i = url.indexOf('/', i + 1);
            if (i == -1) {
                i = url.getLength();
            } else {
                ++i;
            }
            //TODO: cheesy way of ensuring home's path ends in slash:
            if (!home.isEmpty() && home[home.getLength() - 1] != '/') {
                home += "/";
            }
            try {
                home = rtl::Uri::convertRelToAbs(home, url.copy(i));
            } catch (rtl::MalformedUriException & e) {
                SAL_WARN("sal.file", "rtl::MalformedUriException " << e.getMessage());
                return osl_File_E_INVAL;
            }
            return getSystemPathFromFileUrl(home, path, false);
        } else {
            // FIXME: replace ~user with user's home directory
            return osl_File_E_INVAL;
        }
    }
    return osl_File_E_None;
}

}

oslFileError SAL_CALL osl_getSystemPathFromFileURL( rtl_uString *ustrFileURL, rtl_uString **pustrSystemPath )
{
    OUString path;
    oslFileError e;
    try {
        e = getSystemPathFromFileUrl(
            OUString::unacquired(&ustrFileURL), &path, true);
    } catch (std::length_error) {
        e = osl_File_E_RANGE;
    }
    if (e == osl_File_E_None) {
        rtl_uString_assign(pustrSystemPath, path.pData);
    }
    return e;
}

oslFileError SAL_CALL osl_getFileURLFromSystemPath( rtl_uString *ustrSystemPath, rtl_uString **pustrFileURL )
{
    static const sal_Unicode pDoubleSlash[2] = { '/', '/' };

    rtl_uString *pTmp = nullptr;
    sal_Int32 nIndex;

    if( ustrSystemPath->length == 0 )
        return osl_File_E_INVAL;

    /* temporary hack: if already file url, return ustrSystemPath */

    if( rtl_ustr_ascii_shortenedCompare_WithLength( ustrSystemPath->buffer, ustrSystemPath->length,"file:", 5 ) == 0 )
    {
    /*
        if( 0 == rtl_ustr_ascii_shortenedCompare_WithLength( ustrSystemPath->buffer, ustrSystemPath->length,"file://", 7 ) )
        {
            OSL_FAIL( "osl_getFileURLFromSystemPath: input is already file URL" );
            rtl_uString_assign( pustrFileURL, ustrSystemPath );
        }
        else
        {
            rtl_uString *pTmp2 = NULL;

            OSL_FAIL( "osl_getFileURLFromSystemPath: input is wrong file URL" );
            rtl_uString_newFromStr_WithLength( pustrFileURL, ustrSystemPath->buffer + 5, ustrSystemPath->length - 5 );
            rtl_uString_newFromAscii( &pTmp2, "file://" );
            rtl_uString_newConcat( pustrFileURL, *pustrFileURL, pTmp2 );
            rtl_uString_release( pTmp2 );
        }
        return osl_File_E_None;
        */
        return osl_File_E_INVAL;
    }

    /* check if system path starts with ~ or ~user and replace it with the appropriate home dir */
    if( ustrSystemPath->buffer[0] == '~' )
    {
        /* check if another user is specified */
        if( ( ustrSystemPath->length == 1 ) ||
            ( ustrSystemPath->buffer[1] == '/' ) )
        {
            /* osl_getHomeDir returns file URL */
            oslSecurity pSecurity = osl_getCurrentSecurity();
            osl_getHomeDir( pSecurity , &pTmp );
            osl_freeSecurityHandle( pSecurity );

            if (!pTmp)
                return osl_File_E_INVAL;

            /* remove "file://" prefix */
            rtl_uString_newFromStr_WithLength( &pTmp, pTmp->buffer + 7, pTmp->length - 7 );

            /* replace '~' in original string */
            rtl_uString_newReplaceStrAt( &pTmp, ustrSystemPath, 0, 1, pTmp );
        }
        else
        {
            /* FIXME: replace ~user with users home directory */
            return osl_File_E_INVAL;
        }
    }

    /* check if initial string contains double instances of '/' */
    nIndex = rtl_ustr_indexOfStr_WithLength( ustrSystemPath->buffer, ustrSystemPath->length, pDoubleSlash, 2 );
    if( nIndex != -1 )
    {
        sal_Int32 nSrcIndex;
        sal_Int32 nDeleted = 0;

        /* if pTmp is not already allocated, copy ustrSystemPath for modification */
        if( nullptr == pTmp )
            rtl_uString_newFromString( &pTmp, ustrSystemPath );

        /* adapt index to pTmp */
        nIndex += pTmp->length - ustrSystemPath->length;

        /* remove all occurrences of '//' */
        for( nSrcIndex = nIndex + 1; nSrcIndex < pTmp->length; nSrcIndex++ )
        {
            if( (pTmp->buffer[nSrcIndex] == '/') && (pTmp->buffer[nIndex] == '/') )
                nDeleted++;
            else
                pTmp->buffer[++nIndex] = pTmp->buffer[nSrcIndex];
        }

        /* adjust length member */
        pTmp->length -= nDeleted;
    }

    if( nullptr == pTmp )
        rtl_uString_assign( &pTmp, ustrSystemPath );

    /* file URLs must be URI encoded */
    rtl_uriEncode( pTmp, uriCharClass, rtl_UriEncodeIgnoreEscapes, RTL_TEXTENCODING_UTF8, pustrFileURL );

    rtl_uString_release( pTmp );

    /* absolute urls should start with 'file://' */
    if( (*pustrFileURL)->buffer[0] == '/' )
    {
        rtl_uString *pProtocol = nullptr;

        rtl_uString_newFromAscii( &pProtocol, "file://" );
        rtl_uString_newConcat( pustrFileURL, pProtocol, *pustrFileURL );
        rtl_uString_release( pProtocol );
    }

    return osl_File_E_None;
}

/*
 * relative URLs are not accepted
 */
oslFileError osl_getSystemPathFromFileURL_Ex(
    rtl_uString *ustrFileURL, rtl_uString **pustrSystemPath)
{
    rtl_uString* temp = nullptr;
    oslFileError osl_error = osl_getSystemPathFromFileURL(ustrFileURL, &temp);

    if (osl_error == osl_File_E_None)
    {
        if (temp->buffer[0] == '/')
        {
            *pustrSystemPath = temp;
        }
        else
        {
            rtl_uString_release(temp);
            osl_error = osl_File_E_INVAL;
        }
    }

    return osl_error;
}

namespace
{

    /******************************************************
     * Helper function, return a pinter to the final '\0'
     * of a string
     ******************************************************/

    sal_Unicode* ustrtoend(sal_Unicode* pStr)
    {
        return (pStr + rtl_ustr_getLength(pStr));
    }

    sal_Unicode* ustrchrcat(const sal_Unicode chr, sal_Unicode* d)
    {
        sal_Unicode* p = ustrtoend(d);
        *p++ = chr;
        *p   = 0;
        return d;
    }

    bool _islastchr(sal_Unicode* pStr, sal_Unicode Chr)
    {
           sal_Unicode* p = ustrtoend(pStr);
           if (p > pStr)
               p--;
           return (*p == Chr);
    }

    /******************************************************
     * Remove the last part of a path, a path that has
     * only a '/' or no '/' at all will be returned
     * unmodified
     ******************************************************/

    sal_Unicode* _rmlastpathtoken(sal_Unicode* aPath)
    {
        /*  we always may skip -2 because we
               may at least stand on a '/' but
               either there is no other character
               before this '/' or it's another
               character than the '/'
        */
        sal_Unicode* p = ustrtoend(aPath) - 2;

        // move back to the next path separator
        // or to the start of the string
        while ((p > aPath) && (*p != '/'))
            p--;

        if (p >= aPath)
        {
            if (*p == '/')
            {
                p++;
               *p = '\0';
            }
            else
            {
                   *p = '\0';
            }
        }

        return aPath;
    }

    oslFileError _osl_resolvepath(
        /*inout*/ sal_Unicode* path,
        /*inout*/ bool* failed)
    {
        oslFileError ferr = osl_File_E_None;

        if (!*failed)
        {
            char unresolved_path[PATH_MAX];
            if (!UnicodeToText(unresolved_path, sizeof(unresolved_path), path, rtl_ustr_getLength(path)))
                return oslTranslateFileError(OSL_FET_ERROR, ENAMETOOLONG);

            char resolved_path[PATH_MAX];
            if (realpath(unresolved_path, resolved_path))
            {
                if (!TextToUnicode(resolved_path, strlen(resolved_path), path, PATH_MAX))
                    return oslTranslateFileError(OSL_FET_ERROR, ENAMETOOLONG);

            }
            else
            {
                if (EACCES == errno || ENOTDIR == errno || ENOENT == errno)
                    *failed = true;
                else
                    ferr = oslTranslateFileError(OSL_FET_ERROR, errno);
            }
        }

        return ferr;
    }

    /******************************************************
     * Works even with non existing paths. The resulting
     * path must not exceed PATH_MAX else
     * osl_File_E_NAMETOOLONG is the result
     ******************************************************/

    oslFileError osl_getAbsoluteFileURL_impl_(const rtl::OUString& unresolved_path, rtl::OUString& resolved_path)
    {
        // the given unresolved path must not exceed PATH_MAX
        if (unresolved_path.getLength() >= (PATH_MAX - 2))
            return oslTranslateFileError(OSL_FET_ERROR, ENAMETOOLONG);

        sal_Unicode        path_resolved_so_far[PATH_MAX];
        const sal_Unicode* punresolved = unresolved_path.getStr();
        sal_Unicode*       presolvedsf = path_resolved_so_far;

        // reserve space for leading '/' and trailing '\0'
        // do not exceed this limit
        sal_Unicode* sentinel = path_resolved_so_far + PATH_MAX - 2;

        // if realpath fails with error ENOTDIR, EACCES or ENOENT
        // we will not call it again, because _osl_realpath should also
        // work with non existing directories etc.
        bool realpath_failed = false;
        oslFileError ferr;

        path_resolved_so_far[0] = '\0';

        while (*punresolved != '\0')
        {
            // ignore '/.' , skip one part back when '/..'

            if ((*punresolved == '.') && (*presolvedsf == '/'))
            {
                if (*(punresolved + 1) == '\0')
                {
                    punresolved++;
                    continue;
                }
                else if (*(punresolved + 1) == '/')
                {
                    punresolved += 2;
                    continue;
                }
                else if ((*(punresolved + 1) == '.') && (*(punresolved + 2) == '\0' || (*(punresolved + 2) == '/')))
                {
                    _rmlastpathtoken(path_resolved_so_far);

                    presolvedsf = ustrtoend(path_resolved_so_far) - 1;

                    if (*(punresolved + 2) == '/')
                        punresolved += 3;
                    else
                        punresolved += 2;

                    continue;
                }
                else // a file or directory name may start with '.'
                {
                    if ((presolvedsf = ustrtoend(path_resolved_so_far)) > sentinel)
                        return oslTranslateFileError(OSL_FET_ERROR, ENAMETOOLONG);

                    ustrchrcat(*punresolved++, path_resolved_so_far);

                    if (*punresolved == '\0' && !realpath_failed)
                    {
                        ferr = _osl_resolvepath(
                            path_resolved_so_far,
                            &realpath_failed);

                        if (ferr != osl_File_E_None)
                            return ferr;
                    }
                }
            }
            else if (*punresolved == '/')
            {
                if ((presolvedsf = ustrtoend(path_resolved_so_far)) > sentinel)
                    return oslTranslateFileError(OSL_FET_ERROR, ENAMETOOLONG);

                ustrchrcat(*punresolved++, path_resolved_so_far);

                if (!realpath_failed)
                {
                    ferr = _osl_resolvepath(
                        path_resolved_so_far,
                        &realpath_failed);

                    if (ferr != osl_File_E_None)
                        return ferr;

                    if (!_islastchr(path_resolved_so_far, '/'))
                    {
                        if ((presolvedsf = ustrtoend(path_resolved_so_far)) > sentinel)
                            return oslTranslateFileError(OSL_FET_ERROR, ENAMETOOLONG);

                        ustrchrcat('/', path_resolved_so_far);
                    }
                }
            }
            else // any other character
            {
                if ((presolvedsf = ustrtoend(path_resolved_so_far)) > sentinel)
                    return oslTranslateFileError(OSL_FET_ERROR, ENAMETOOLONG);

                ustrchrcat(*punresolved++, path_resolved_so_far);

                if (*punresolved == '\0' && !realpath_failed)
                {
                    ferr = _osl_resolvepath(
                        path_resolved_so_far,
                        &realpath_failed);

                    if (ferr != osl_File_E_None)
                        return ferr;
                }
            }
        }

        sal_Int32 len = rtl_ustr_getLength(path_resolved_so_far);

        OSL_ASSERT(len < PATH_MAX);

        resolved_path = rtl::OUString(path_resolved_so_far, len);

        return osl_File_E_None;
    }

}

oslFileError osl_getAbsoluteFileURL(rtl_uString*  ustrBaseDirURL, rtl_uString* ustrRelativeURL, rtl_uString** pustrAbsoluteURL)
{
    // Work around the below call to getSystemPathFromFileURL rejecting input
    // that starts with "/" (for whatever reason it behaves that way; but
    // changing that would start to break lots of tests at least):
    rtl::OUString relUrl(ustrRelativeURL);
    if (relUrl.startsWith("//")) {
        relUrl = "file:" + relUrl;
    } else if (relUrl.startsWith("/")) {
        relUrl = "file://" + relUrl;
    }

    FileBase::RC  rc;
    rtl::OUString unresolved_path;

    rc = FileBase::getSystemPathFromFileURL(relUrl, unresolved_path);

    if(rc != FileBase::E_None)
        return oslFileError(rc);

    if (systemPathIsRelativePath(unresolved_path))
    {
        rtl::OUString base_path;
        rc = (FileBase::RC) osl_getSystemPathFromFileURL_Ex(ustrBaseDirURL, &base_path.pData);

        if (rc != FileBase::E_None)
            return oslFileError(rc);

        rtl::OUString abs_path;
        systemPathMakeAbsolutePath(base_path, unresolved_path, abs_path);

        unresolved_path = abs_path;
    }

    rtl::OUString resolved_path;
    rc = (FileBase::RC) osl_getAbsoluteFileURL_impl_(unresolved_path, resolved_path);
    if (rc == FileBase::E_None)
    {
        rc = (FileBase::RC) osl_getFileURLFromSystemPath(resolved_path.pData, pustrAbsoluteURL);
        OSL_ASSERT(FileBase::E_None == rc);
    }

    return oslFileError(rc);
}

namespace osl { namespace detail {
    /*********************************************
     No separate error code if unicode to text
     conversion or getenv fails because for the
     caller there is no difference why a file
     could not be found in $PATH
     ********************************************/

    bool find_in_PATH(const rtl::OUString& file_path, rtl::OUString& result)
    {
        bool          bfound = false;
        rtl::OUString path("PATH");
        rtl::OUString env_path;

        if (osl_getEnvironment(path.pData, &env_path.pData) == osl_Process_E_None)
            bfound = osl::searchPath(file_path, env_path, result);

        return bfound;
    }
} }

namespace
{
    /*********************************************
     No separate error code if unicode to text
     conversion or getcwd fails because for the
     caller there is no difference why a file
     could not be found in CDW
     ********************************************/

    bool find_in_CWD(const rtl::OUString& file_path, rtl::OUString& result)
    {
        bool bfound = false;
        rtl::OUString cwd_url;

        if (osl_getProcessWorkingDir(&cwd_url.pData) == osl_Process_E_None)
        {
            rtl::OUString cwd;
            FileBase::getSystemPathFromFileURL(cwd_url, cwd);
            bfound = osl::searchPath(file_path, cwd, result);
        }
        return bfound;
    }

    bool find_in_searchPath(const rtl::OUString& file_path, rtl_uString* search_path, rtl::OUString& result)
    {
        return (search_path && osl::searchPath(file_path, rtl::OUString(search_path), result));
    }

}

oslFileError osl_searchFileURL(rtl_uString* ustrFilePath, rtl_uString* ustrSearchPath, rtl_uString** pustrURL)
{
    OSL_PRECOND(ustrFilePath && pustrURL, "osl_searchFileURL: invalid parameter");

    FileBase::RC  rc;
    rtl::OUString file_path;

    // try to interpret search path as file url else assume it's a system path list
    rc = FileBase::getSystemPathFromFileURL(ustrFilePath, file_path);
    if (rc == FileBase::E_INVAL)
        file_path = ustrFilePath;
    else if (rc != FileBase::E_None)
        return oslFileError(rc);

    bool          bfound = false;
    rtl::OUString result;

    if (find_in_searchPath(file_path, ustrSearchPath, result) ||
        osl::detail::find_in_PATH(file_path, result) ||
        find_in_CWD(file_path, result))
    {
        rtl::OUString resolved;

        if (osl::realpath(result, resolved))
        {
            oslFileError osl_error = osl_getFileURLFromSystemPath(resolved.pData, pustrURL);
            SAL_WARN_IF(osl_File_E_None != osl_error, "sal.file", "osl_getFileURLFromSystemPath failed");
            bfound = true;
        }
    }
    return bfound ? osl_File_E_None : osl_File_E_NOENT;
}

oslFileError FileURLToPath(char * buffer, size_t bufLen, rtl_uString* ustrFileURL)
{
    rtl_uString* ustrSystemPath = nullptr;
    oslFileError osl_error      = osl_getSystemPathFromFileURL(ustrFileURL, &ustrSystemPath);

    if(osl_error != osl_File_E_None)
        return osl_error;

    osl_systemPathRemoveSeparator(ustrSystemPath);

    /* convert unicode path to text */
    if(!UnicodeToText( buffer, bufLen, ustrSystemPath->buffer, ustrSystemPath->length))
        osl_error = oslTranslateFileError(OSL_FET_ERROR, errno);

    rtl_uString_release(ustrSystemPath);

    return osl_error;
}

namespace
{
    class UnicodeToTextConverter_Impl
    {
        rtl_UnicodeToTextConverter m_converter;

        UnicodeToTextConverter_Impl()
            : m_converter (rtl_createUnicodeToTextConverter (osl_getThreadTextEncoding()))
        {}

        ~UnicodeToTextConverter_Impl()
        {
            rtl_destroyUnicodeToTextConverter (m_converter);
        }
    public:
        static UnicodeToTextConverter_Impl & getInstance()
        {
            static UnicodeToTextConverter_Impl g_theConverter;
            return g_theConverter;
        }

        sal_Size convert(
            sal_Unicode const * pSrcBuf, sal_Size nSrcChars, sal_Char * pDstBuf, sal_Size nDstBytes,
            sal_uInt32 nFlags, sal_uInt32 * pInfo, sal_Size * pSrcCvtChars)
        {
            OSL_ASSERT(m_converter != nullptr);
            return rtl_convertUnicodeToText (
                m_converter, nullptr, pSrcBuf, nSrcChars, pDstBuf, nDstBytes, nFlags, pInfo, pSrcCvtChars);
        }
    };
}

int UnicodeToText( char * buffer, size_t bufLen, const sal_Unicode * uniText, sal_Int32 uniTextLen )
{
    sal_uInt32   nInfo = 0;
    sal_Size     nSrcChars = 0;

    sal_Size nDestBytes = UnicodeToTextConverter_Impl::getInstance().convert (
        uniText, uniTextLen, buffer, bufLen,
        OUSTRING_TO_OSTRING_CVTFLAGS | RTL_UNICODETOTEXT_FLAGS_FLUSH, &nInfo, &nSrcChars);

    if( nInfo & RTL_UNICODETOTEXT_INFO_DESTBUFFERTOSMALL )
    {
        errno = EOVERFLOW;
        return 0;
    }

    /* ensure trailing '\0' */
    buffer[nDestBytes] = '\0';
    return nDestBytes;
}

namespace
{
    class TextToUnicodeConverter_Impl
    {
        rtl_TextToUnicodeConverter m_converter;

        TextToUnicodeConverter_Impl()
            : m_converter (rtl_createTextToUnicodeConverter (osl_getThreadTextEncoding()))
        {}

        ~TextToUnicodeConverter_Impl()
        {
            rtl_destroyTextToUnicodeConverter (m_converter);
        }

    public:
        static TextToUnicodeConverter_Impl & getInstance()
        {
            static TextToUnicodeConverter_Impl g_theConverter;
            return g_theConverter;
        }

        sal_Size convert(
            sal_Char const * pSrcBuf, sal_Size nSrcBytes, sal_Unicode * pDstBuf, sal_Size nDstChars,
            sal_uInt32 nFlags, sal_uInt32 * pInfo, sal_Size * pSrcCvtBytes)
        {
            OSL_ASSERT(m_converter != nullptr);
            return rtl_convertTextToUnicode (
                m_converter, nullptr, pSrcBuf, nSrcBytes, pDstBuf, nDstChars, nFlags, pInfo, pSrcCvtBytes);
        }
    };
}

int TextToUnicode(
    const char*  text,
    size_t       text_buffer_size,
    sal_Unicode* unic_text,
    sal_Int32    unic_text_buffer_size)
{
    sal_uInt32 nInfo = 0;
    sal_Size   nSrcChars = 0;

    sal_Size nDestBytes = TextToUnicodeConverter_Impl::getInstance().convert(
        text,  text_buffer_size, unic_text, unic_text_buffer_size,
        OSTRING_TO_OUSTRING_CVTFLAGS | RTL_TEXTTOUNICODE_FLAGS_FLUSH, &nInfo, &nSrcChars);

    if (nInfo & RTL_TEXTTOUNICODE_INFO_DESTBUFFERTOSMALL)
    {
        errno = EOVERFLOW;
        return 0;
    }

    /* ensure trailing '\0' */
    unic_text[nDestBytes] = '\0';
    return nDestBytes;
}

/* vim:set shiftwidth=4 softtabstop=4 expandtab: */