summaryrefslogtreecommitdiff
path: root/jvmfwk/plugins/sunmajor/pluginlib/sunjavaplugin.cxx
blob: 0bd412408b3b6759d7a08aa5115d9f3383d49091 (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
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
/* -*- 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 .
 */


#ifdef _WIN32
# include <stdio.h>
# include <sys/stat.h>
# include <windows.h>
#endif

#ifdef ANDROID
# include <dlfcn.h>
#endif

#include <string.h>

#include <cassert>
#include <memory>
#include <utility>
#include <vector>

#include "config_options.h"
#include "osl/diagnose.h"
#include "rtl/ustring.hxx"
#include "rtl/ustrbuf.hxx"
#include "osl/module.hxx"
#include "osl/mutex.hxx"
#include "osl/process.h"
#include "osl/thread.hxx"
#include "osl/file.hxx"
#include "rtl/instance.hxx"
#include "osl/getglobalmutex.hxx"
#include <setjmp.h>
#include <signal.h>
#include <stack>

#include "jni.h"
#include "rtl/byteseq.hxx"
#include "vendorplugin.hxx"
#include "util.hxx"
#include "sunversion.hxx"
#include "vendorlist.hxx"
#include "diagnostics.h"

#ifdef MACOSX
#include "util_cocoa.hxx"
#endif

#ifdef ANDROID
#include <osl/detail/android-bootstrap.h>
#else
#if !ENABLE_RUNTIME_OPTIMIZATIONS
#define FORCE_INTERPRETED 1
#elif defined HAVE_VALGRIND_HEADERS
#include <valgrind/valgrind.h>
#define FORCE_INTERPRETED RUNNING_ON_VALGRIND
#else
#define FORCE_INTERPRETED 0
#endif
#endif

#if defined LINUX && (defined X86 || defined X86_64)
#include <sys/resource.h>
#endif

using namespace osl;
using namespace std;
using namespace jfw_plugin;


namespace {

struct PluginMutex: public ::rtl::Static<osl::Mutex, PluginMutex> {};

#if defined(UNX) && !defined(ANDROID)
OString getPluginJarPath(
    const OUString & sVendor,
    const OUString& sLocation,
    const OUString& sVersion)
{
    OString ret;
    OUString sName1("javaplugin.jar");
    OUString sName2("plugin.jar");
    OUString sPath;
    if ( sVendor == "Sun Microsystems Inc." )
    {
        SunVersion ver142("1.4.2-ea");
        SunVersion ver150("1.5.0-ea");
        SunVersion ver(sVersion);
        OSL_ASSERT(ver142 && ver150 && ver);

        OUString sName;
        if (ver < ver142)
        {
            sName = sName1;
        }
        else if (ver < ver150)
        {//this will cause ea, beta etc. to have plugin.jar in path.
            //but this does not harm. 1.5.0-beta < 1.5.0
            sName = sName2;
        }
        if (!sName.isEmpty())
        {
            sName = sLocation + "/lib/" + sName;
            OSL_VERIFY(
                osl_getSystemPathFromFileURL(sName.pData, & sPath.pData)
                == osl_File_E_None);
        }
    }
    else
    {
        OUString sName(sLocation + "/lib/" + sName1);
        OUString sPath1;
        OUString sPath2;
        if (osl_getSystemPathFromFileURL(sName.pData, & sPath1.pData)
            == osl_File_E_None)
        {
            sName = sLocation + "/lib/" + sName2;
            if (osl_getSystemPathFromFileURL(sName.pData, & sPath2.pData)
                == osl_File_E_None)
            {
                char sep[] = {SAL_PATHSEPARATOR, 0};
                sPath = sPath1 + OUString::createFromAscii(sep) + sPath2;
            }
        }
        OSL_ASSERT(!sPath.isEmpty());
    }
    ret = OUStringToOString(sPath, osl_getThreadTextEncoding());

    return ret;
}
#endif // UNX


std::unique_ptr<JavaInfo> createJavaInfo(
    const rtl::Reference<VendorBase> & info)
{
    OUStringBuffer buf(1024);
    buf.append(info->getRuntimeLibrary());
    if (!info->getLibraryPath().isEmpty())
    {
        buf.append("\n");
        buf.append(info->getLibraryPath());
        buf.append("\n");
    }
    OUString sVendorData = buf.makeStringAndClear();
    return std::unique_ptr<JavaInfo>(
        new JavaInfo{
            info->getVendor(), info->getHome(), info->getVersion(),
            sal_uInt64(info->supportsAccessibility() ? 1 : 0),
            sal_uInt64(info->needsRestart() ? JFW_REQUIRE_NEEDRESTART : 0),
            rtl::ByteSequence(
                reinterpret_cast<sal_Int8*>(sVendorData.pData->buffer),
                sVendorData.getLength() * sizeof(sal_Unicode))});
}

OUString getRuntimeLib(const rtl::ByteSequence & data)
{
    const sal_Unicode* chars = reinterpret_cast<sal_Unicode const *>(data.getConstArray());
    sal_Int32 len = data.getLength();
    OUString sData(chars, len / 2);
    //the runtime lib is on the first line
    sal_Int32 index = 0;
    OUString aToken = sData.getToken( 0, '\n', index);

    return aToken;
}

jmp_buf jmp_jvm_abort;
sig_atomic_t g_bInGetJavaVM = 0;

extern "C" void JNICALL abort_handler()
{
    // If we are within JNI_CreateJavaVM then we jump back into getJavaVM
    if( g_bInGetJavaVM != 0 )
    {
        fprintf(stderr, "JavaVM: JNI_CreateJavaVM called os::abort(), caught by abort_handler in javavm.cxx\n");
        longjmp( jmp_jvm_abort, 0);
    }
}

/** helper function to check Java version requirements

    This function checks if the Java version of the given VendorBase
    meets the given Java version requirements.

    @param aVendorInfo
        [in]  the object to be inspected whether it meets the version requirements
    @param sMinVersion
        [in] represents the minimum version of a JRE. The string can be empty.
    @param sMaxVersion
        [in] represents the maximum version of a JRE. The string can be empty.
    @param arExcludeList
        [in] contains a list of &quot;bad&quot; versions. JREs which have one of these
        versions must not be returned by this function.

   @return
    javaPluginError::NONE the function ran successfully and the version requirements are met
    javaPluginError::FailedVersion at least one of the version requirements (minVersion,
    maxVersion, excludeVersions) was violated
    javaPluginError::WrongVersionFormat the version strings in
    <code>sMinVersion,sMaxVersion,arExcludeList</code> are not recognized as valid
    version strings.

     */
javaPluginError checkJavaVersionRequirements(
    rtl::Reference<VendorBase> const & aVendorInfo,
    OUString const& sMinVersion,
    OUString const& sMaxVersion,
    std::vector<OUString> const & arExcludeList)
{
    if (!aVendorInfo->isValidArch())
    {
        return javaPluginError::WrongArch;
    }
    if (!sMinVersion.isEmpty())
    {
        try
        {
            if (aVendorInfo->compareVersions(sMinVersion) < 0)
                return javaPluginError::FailedVersion;
        }
        catch (MalformedVersionException&)
        {
            //The minVersion was not recognized as valid for this vendor.
            JFW_ENSURE(
                false,
                "[Java framework]sunjavaplugin does not know version: "
                + sMinVersion + " for vendor: " + aVendorInfo->getVendor()
                + " .Check minimum Version." );
            return javaPluginError::WrongVersionFormat;
        }
    }

    if (!sMaxVersion.isEmpty())
    {
        try
        {
            if (aVendorInfo->compareVersions(sMaxVersion) > 0)
                return javaPluginError::FailedVersion;
        }
        catch (MalformedVersionException&)
        {
            //The maxVersion was not recognized as valid for this vendor.
            JFW_ENSURE(
                false,
                "[Java framework]sunjavaplugin does not know version: "
                + sMaxVersion + " for vendor: " + aVendorInfo->getVendor()
                + " .Check maximum Version." );
            return javaPluginError::WrongVersionFormat;
        }
    }

    for (auto const & sExVer: arExcludeList) {
        try
        {
            if (aVendorInfo->compareVersions(sExVer) == 0)
                return javaPluginError::FailedVersion;
        }
        catch (MalformedVersionException&)
        {
            //The excluded version was not recognized as valid for this vendor.
            JFW_ENSURE(
                false,
                "[Java framework]sunjavaplugin does not know version: "
                + sExVer + " for vendor: " + aVendorInfo->getVendor()
                + " .Check excluded versions." );
            return javaPluginError::WrongVersionFormat;
        }
    }

    return javaPluginError::NONE;
}

}

javaPluginError jfw_plugin_getAllJavaInfos(
    bool checkJavaHomeAndPath,
    OUString const& sVendor,
    OUString const& sMinVersion,
    OUString const& sMaxVersion,
    std::vector<OUString> const &arExcludeList,
    std::vector<std::unique_ptr<JavaInfo>>* parJavaInfo,
    std::vector<rtl::Reference<jfw_plugin::VendorBase>> & infos)
{
    assert(parJavaInfo);

    OSL_ASSERT(!sVendor.isEmpty());
    if (sVendor.isEmpty())
        return javaPluginError::InvalidArg;

    //Find all JREs
    vector<rtl::Reference<VendorBase> > vecInfos =
        addAllJREInfos(checkJavaHomeAndPath, infos);
    vector<rtl::Reference<VendorBase> > vecVerifiedInfos;

    typedef vector<rtl::Reference<VendorBase> >::iterator it;
    for (it i= vecInfos.begin(); i != vecInfos.end(); ++i)
    {
        const rtl::Reference<VendorBase>& cur = *i;

        if (!sVendor.equals(cur->getVendor()))
            continue;

        javaPluginError err = checkJavaVersionRequirements(
            cur, sMinVersion, sMaxVersion, arExcludeList);

        if (err == javaPluginError::FailedVersion || err == javaPluginError::WrongArch)
            continue;
        else if (err == javaPluginError::WrongVersionFormat)
            return err;

        vecVerifiedInfos.push_back(*i);
    }
    //Now vecVerifiedInfos contains all those JREs which meet the version requirements
    //Transfer them into the array that is passed out.
    parJavaInfo->clear();
    typedef vector<rtl::Reference<VendorBase> >::const_iterator cit;
    for (cit ii = vecVerifiedInfos.begin(); ii != vecVerifiedInfos.end(); ++ii)
    {
        parJavaInfo->push_back(createJavaInfo(*ii));
    }

    return javaPluginError::NONE;
}

javaPluginError jfw_plugin_getJavaInfoByPath(
    OUString const& sPath,
    OUString const& sVendor,
    OUString const& sMinVersion,
    OUString const& sMaxVersion,
    std::vector<OUString> const &arExcludeList,
    std::unique_ptr<JavaInfo> * ppInfo)
{
    assert(ppInfo != nullptr);
    OSL_ASSERT(!sPath.isEmpty());
    if (sPath.isEmpty())
        return javaPluginError::InvalidArg;

    OSL_ASSERT(!sVendor.isEmpty());
    if (sVendor.isEmpty())
        return javaPluginError::InvalidArg;

    rtl::Reference<VendorBase> aVendorInfo = getJREInfoByPath(sPath);
    if (!aVendorInfo.is())
        return javaPluginError::NoJre;

    //Check if the detected JRE matches the version requirements
    if (!sVendor.equals(aVendorInfo->getVendor()))
        return javaPluginError::NoJre;
    javaPluginError errorcode = checkJavaVersionRequirements(
            aVendorInfo, sMinVersion, sMaxVersion, arExcludeList);

    if (errorcode == javaPluginError::NONE)
        *ppInfo = createJavaInfo(aVendorInfo);

    return errorcode;
}

javaPluginError jfw_plugin_getJavaInfoFromJavaHome(
    std::vector<pair<OUString, jfw::VersionInfo>> const& vecVendorInfos,
    std::unique_ptr<JavaInfo> * ppInfo,
    std::vector<rtl::Reference<VendorBase>> & infos)
{
    assert(ppInfo);

    std::vector<rtl::Reference<VendorBase>> infoJavaHome;
    addJavaInfoFromJavaHome(infos, infoJavaHome);

    if (infoJavaHome.empty())
        return javaPluginError::NoJre;
    assert(infoJavaHome.size() == 1);

    //Check if the detected JRE matches the version requirements
    typedef std::vector<pair<OUString, jfw::VersionInfo>>::const_iterator ci_pl;
    for (ci_pl vendorInfo = vecVendorInfos.begin(); vendorInfo != vecVendorInfos.end(); ++vendorInfo)
    {
        const OUString& vendor = vendorInfo->first;
        jfw::VersionInfo versionInfo = vendorInfo->second;

        if (vendor.equals(infoJavaHome[0]->getVendor()))
        {
            javaPluginError errorcode = checkJavaVersionRequirements(
                infoJavaHome[0],
                versionInfo.sMinVersion,
                versionInfo.sMaxVersion,
                versionInfo.vecExcludeVersions);

            if (errorcode == javaPluginError::NONE)
            {
                *ppInfo = createJavaInfo(infoJavaHome[0]);
                return javaPluginError::NONE;
            }
        }
    }

    return javaPluginError::NoJre;
}

javaPluginError jfw_plugin_getJavaInfosFromPath(
    std::vector<std::pair<OUString, jfw::VersionInfo>> const& vecVendorInfos,
    std::vector<std::unique_ptr<JavaInfo>> & javaInfosFromPath,
    std::vector<rtl::Reference<jfw_plugin::VendorBase>> & infos)
{
    // find JREs from PATH
    vector<rtl::Reference<VendorBase>> vecInfosFromPath;
    addJavaInfosFromPath(infos, vecInfosFromPath);

    vector<std::unique_ptr<JavaInfo>> vecVerifiedInfos;

    // copy infos of JREs that meet version requirements to vecVerifiedInfos
    typedef vector<rtl::Reference<VendorBase> >::iterator it;
    for (it i= vecInfosFromPath.begin(); i != vecInfosFromPath.end(); ++i)
    {
        const rtl::Reference<VendorBase>& currentInfo = *i;

        typedef std::vector<pair<OUString, jfw::VersionInfo>>::const_iterator ci_pl;
        for (ci_pl vendorInfo = vecVendorInfos.begin(); vendorInfo != vecVendorInfos.end(); ++vendorInfo)
        {
            const OUString& vendor = vendorInfo->first;
            jfw::VersionInfo const & versionInfo = vendorInfo->second;

            if (vendor.equals(currentInfo->getVendor()))
            {
                javaPluginError errorcode = checkJavaVersionRequirements(
                    currentInfo,
                    versionInfo.sMinVersion,
                    versionInfo.sMaxVersion,
                    versionInfo.vecExcludeVersions);

                if (errorcode == javaPluginError::NONE)
                {
                    vecVerifiedInfos.push_back(createJavaInfo(currentInfo));
                }
            }
        }
    }

    if (vecVerifiedInfos.empty())
        return javaPluginError::NoJre;

    javaInfosFromPath = std::move(vecVerifiedInfos);

    return javaPluginError::NONE;
}


#if defined(_WIN32)

// Load msvcr71.dll using an explicit full path from where it is
// present as bundled with the JRE. In case it is not found where we
// think it should be, do nothing, and just let the implicit loading
// that happens when loading the JVM take care of it.

static void load_msvcr(OUString const & jvm_dll, OUStringLiteral msvcr)
{
    // First check if msvcr71.dll is in the same folder as jvm.dll. It
    // normally isn't, at least up to 1.6.0_22, but who knows if it
    // might be in the future.
    sal_Int32 slash = jvm_dll.lastIndexOf('\\');

    if (slash == -1)
    {
        // Huh, weird path to jvm.dll. Oh well.
        SAL_WARN("jfw", "JVM pathname <" + jvm_dll + "> w/o backslash");
        return;
    }

    if (LoadLibraryW(
            reinterpret_cast<wchar_t const *>(
                OUString(jvm_dll.copy(0, slash+1) + msvcr).getStr())))
        return;

    // Then check if msvcr71.dll is in the parent folder of where
    // jvm.dll is. That is currently (1.6.0_22) as far as I know the
    // normal case.
    slash = jvm_dll.lastIndexOf('\\', slash);

    if (slash == -1)
        return;

    LoadLibraryW(
        reinterpret_cast<wchar_t const *>(
            OUString(jvm_dll.copy(0, slash+1) + msvcr).getStr()));
}

// Check if the jvm DLL imports msvcr71.dll, and in that case try
// loading it explicitly. In case something goes wrong, do nothing,
// and just let the implicit loading try to take care of it.
static void do_msvcr_magic(OUString const &jvm_dll)
{
    struct stat st;

    OUString Module;
    osl::FileBase::RC nError = osl::FileBase::getSystemPathFromFileURL(
        jvm_dll, Module);

    if ( osl::FileBase::E_None != nError )
    {
        SAL_WARN(
            "jfw", "getSystemPathFromFileURL(" << jvm_dll << "): " << +nError);
        return;
    }

    FILE *f = _wfopen(reinterpret_cast<LPCWSTR>(Module.getStr()), L"rb");

    if (!f)
    {
        SAL_WARN("jfw", "_wfopen(" << Module << ") failed");
        return;
    }

    if (fstat(fileno(f), &st) == -1)
    {
        SAL_WARN("jfw", "fstat(" << Module << ") failed");
        fclose(f);
        return;
    }

    PIMAGE_DOS_HEADER dos_hdr = static_cast<PIMAGE_DOS_HEADER>(malloc(st.st_size));

    if (fread(dos_hdr, st.st_size, 1, f) != 1 ||
        memcmp(dos_hdr, "MZ", 2) != 0 ||
        dos_hdr->e_lfanew < 0 ||
        dos_hdr->e_lfanew > (LONG) (st.st_size - sizeof(IMAGE_NT_HEADERS)))
    {
        SAL_WARN("jfw", "analyzing <" << Module << "> failed");
        free(dos_hdr);
        fclose(f);
        return;
    }

    fclose(f);

    IMAGE_NT_HEADERS *nt_hdr = reinterpret_cast<IMAGE_NT_HEADERS *>(reinterpret_cast<char *>(dos_hdr) + dos_hdr->e_lfanew);

    DWORD importsVA = nt_hdr->OptionalHeader
            .DataDirectory[IMAGE_DIRECTORY_ENTRY_IMPORT].VirtualAddress;
    // first determine Virtual-to-File-address mapping for the section
    // that contains the import directory
    IMAGE_SECTION_HEADER *sections = IMAGE_FIRST_SECTION(nt_hdr);
    ptrdiff_t VAtoPhys = -1;
    for (int i = 0; i < nt_hdr->FileHeader.NumberOfSections; ++i)
    {
        if (sections->VirtualAddress <= importsVA &&
            importsVA < sections->VirtualAddress + sections->SizeOfRawData)
        {
            VAtoPhys = static_cast<size_t>(sections->PointerToRawData) - static_cast<size_t>(sections->VirtualAddress);
            break;
        }
        ++sections;
    }
    if (-1 == VAtoPhys) // not found?
    {
        SAL_WARN("jfw", "analyzing <" << Module << "> failed");
        free(dos_hdr);
        return;
    }
    IMAGE_IMPORT_DESCRIPTOR *imports =
        reinterpret_cast<IMAGE_IMPORT_DESCRIPTOR *>(reinterpret_cast<char *>(dos_hdr) + importsVA + VAtoPhys);

    while (imports <= reinterpret_cast<IMAGE_IMPORT_DESCRIPTOR *>(reinterpret_cast<char *>(dos_hdr) + st.st_size - sizeof (IMAGE_IMPORT_DESCRIPTOR)) &&
           imports->Name != 0 &&
           imports->Name + VAtoPhys < (DWORD) st.st_size)
    {
        static OUStringLiteral msvcrts[] =
        {
            "msvcr71.dll",
            "msvcr100.dll"
        };
        char const* importName = reinterpret_cast<char *>(dos_hdr) + imports->Name + VAtoPhys;
        sal_Int32 importNameLen = rtl_str_getLength(importName);
        for (size_t i = 0; i < SAL_N_ELEMENTS(msvcrts); ++i)
        {
            if (0 == rtl_str_compareIgnoreAsciiCase_WithLength(
                    importName, importNameLen,
                    msvcrts[i].data, msvcrts[i].size))
            {
                load_msvcr(Module, msvcrts[i]);
                free(dos_hdr);
                return;
            }
        }
        imports++;
    }

    free(dos_hdr);
}

#endif

/** starts a Java Virtual Machine.
    <p>
    The function shall ensure, that the VM does not abort the process
    during instantiation.
    </p>
 */
javaPluginError jfw_plugin_startJavaVirtualMachine(
    const JavaInfo *pInfo,
    const JavaVMOption* arOptions,
    sal_Int32 cOptions,
    JavaVM ** ppVm,
    JNIEnv ** ppEnv)
{
    assert(pInfo != nullptr);
    assert(ppVm != nullptr);
    assert(ppEnv != nullptr);
    // unless guard is volatile the following warning occurs on gcc:
    // warning: variable 't' might be clobbered by `longjmp' or `vfork'
    volatile osl::MutexGuard guard(PluginMutex::get());
    // unless errorcode is volatile the following warning occurs on gcc:
    // warning: variable 'errorcode' might be clobbered by `longjmp' or `vfork'
    volatile javaPluginError errorcode = javaPluginError::NONE;
    //Check if the Vendor (pInfo->sVendor) is supported by this plugin
    if ( ! isVendorSupported(pInfo->sVendor))
        return javaPluginError::WrongVendor;
#ifdef MACOSX
    rtl::Reference<VendorBase> aVendorInfo = getJREInfoByPath( OUString( pInfo->sLocation ) );
    if ( !aVendorInfo.is() || aVendorInfo->compareVersions( OUString( pInfo->sVersion ) ) < 0 )
        return javaPluginError::VmCreationFailed;
#endif
    OUString sRuntimeLib = getRuntimeLib(pInfo->arVendorData);
#ifdef MACOSX
    if ( !JvmfwkUtil_isLoadableJVM( sRuntimeLib ) )
        return javaPluginError::VmCreationFailed;
#endif
    JFW_TRACE2("Using Java runtime library: " << sRuntimeLib);

#ifndef ANDROID
    // On linux we load jvm with RTLD_GLOBAL. This is necessary for debugging, because
    // libjdwp.so need a symbol (fork1) from libjvm which it only gets if the jvm is loaded
    // with RTLD_GLOBAL. On Solaris libjdwp.so is correctly linked with libjvm.so
    osl::Module moduleRt;
#if defined(LINUX)
    if (!moduleRt.load(sRuntimeLib, SAL_LOADMODULE_GLOBAL | SAL_LOADMODULE_NOW))
#elif defined MACOSX
    // Must be SAL_LOADMODULE_GLOBAL when e.g. specifying a
    // -Xrunjdwp:transport=dt_socket,server=y,suspend=n,address=8000 option to
    // JDK 1.8.0_121 at least, as JNI_CreateJavaVM -> Threads::create_vm ->
    // JvmtiExport::post_vm_initialized -> cbEarlyVMInit -> initialize ->
    // util_initialize -> sun.misc.VMSupport.getAgentProperties ->
    // Java_sun_misc_VMSupport_initAgentProperties ->
    // JDK_FindJvmEntry("JVM_INitAgentProperties") ->
    // dlsym(RTLD_DEFAULT, "JVM_INitAgentProperties"):
    if (!moduleRt.load(sRuntimeLib, SAL_LOADMODULE_GLOBAL))
#else
#if defined(_WIN32)
    do_msvcr_magic(sRuntimeLib);
#endif
    if (!moduleRt.load(sRuntimeLib))
#endif
    {
        JFW_ENSURE(false,
                   "[Java framework]sunjavaplugin" SAL_DLLEXTENSION
                      " could not load Java runtime library: \n"
                   + sRuntimeLib + "\n");
        JFW_TRACE0("Could not load Java runtime library: " << sRuntimeLib);
        return javaPluginError::VmCreationFailed;
    }

#if defined UNX && !defined MACOSX
    //Setting the JAVA_HOME is needed for awt
    OUString sPathLocation;
    osl::FileBase::getSystemPathFromFileURL(pInfo->sLocation, sPathLocation);
    osl_setEnvironment(OUString("JAVA_HOME").pData, sPathLocation.pData);
#endif

    typedef jint JNICALL JNI_CreateVM_Type(JavaVM **, JNIEnv **, void *);
    OUString sSymbolCreateJava("JNI_CreateJavaVM");

    JNI_CreateVM_Type * pCreateJavaVM =
        reinterpret_cast<JNI_CreateVM_Type *>(moduleRt.getFunctionSymbol(sSymbolCreateJava));
    if (!pCreateJavaVM)
    {
        OSL_ASSERT(false);
        OString sLib = OUStringToOString(
            sRuntimeLib, osl_getThreadTextEncoding());
        OString sSymbol = OUStringToOString(
            sSymbolCreateJava, osl_getThreadTextEncoding());
        fprintf(stderr,"[Java framework]sunjavaplugin" SAL_DLLEXTENSION
                "Java runtime library: %s does not export symbol %s !\n",
                sLib.getStr(), sSymbol.getStr());
        return javaPluginError::VmCreationFailed;
    }
    moduleRt.release();

    // Valgrind typically emits many false errors when executing JIT'ed JVM
    // code, so force the JVM into interpreted mode:
    bool addForceInterpreted = FORCE_INTERPRETED > 0;

    // Some testing with Java 1.4 showed that JavaVMOption.optionString has to
    // be encoded with the system encoding (i.e., osl_getThreadTextEncoding):
    JavaVMInitArgs vm_args;

    struct Option {
        Option(OString const & theOptionString, void * theExtraInfo):
            optionString(theOptionString), extraInfo(theExtraInfo)
        {}

        OString optionString;
        void * extraInfo;
    };
    std::vector<Option> options;

    // We set an abort handler which is called when the VM calls _exit during
    // JNI_CreateJavaVM. This happens when the LD_LIBRARY_PATH does not contain
    // all some directories of the Java installation. This is necessary for
    // all versions below 1.5.1
    options.push_back(Option("abort", reinterpret_cast<void*>(abort_handler)));
    bool hasStackSize = false;
    for (int i = 0; i < cOptions; i++)
    {
        OString opt(arOptions[i].optionString);
#ifdef UNX
        // Until java 1.5 we need to put a plugin.jar or javaplugin.jar (<1.4.2)
        // in the class path in order to have applet support:
        if (opt.startsWith("-Djava.class.path="))
        {
            OString sAddPath = getPluginJarPath(pInfo->sVendor, pInfo->sLocation,pInfo->sVersion);
            if (!sAddPath.isEmpty())
                opt += OString(SAL_PATHSEPARATOR) + sAddPath;
        }
#endif
        if (opt == "-Xint") {
            addForceInterpreted = false;
        }
        if (opt.startsWith("-Xss")) {
            hasStackSize = true;
        }
        options.push_back(Option(opt, arOptions[i].extraInfo));
    }
    if (addForceInterpreted) {
        options.push_back(Option("-Xint", nullptr));
    }
    if (!hasStackSize) {
#if defined LINUX && (defined X86 || defined X86_64)
        // At least OpenJDK 1.8.0's os::workaround_expand_exec_shield_cs_limit
        // (hotspot/src/os_cpu/linux_x86/vm/os_linux_x86.cpp) can mmap an rwx
        // page into the area that the main stack can grow down to according to
        // "ulimit -s", as os::init_2's (hotspot/src/os/linux/vm/os_linux.cpp)
        // call to
        //
        //   Linux::capture_initial_stack(JavaThread::stack_size_at_create());
        //
        // caps _initial_thread_stack_size at threadStackSizeInBytes ,i.e.,
        // -Xss, which appears to default to only 327680, whereas "ulimit -s"
        // defaults to 8192 * 1024 at least on Fedora 20; so attempt to pass in
        // a useful -Xss argument:
        rlimit l;
        if (getrlimit(RLIMIT_STACK, &l) == 0) {
            if (l.rlim_cur == RLIM_INFINITY) {
                SAL_INFO("jfw", "RLIMIT_STACK RLIM_INFINITY -> 8192K");
                l.rlim_cur = 8192 * 1024;
            } else if (l.rlim_cur > 512 * 1024 * 1024) {
                SAL_INFO(
                    "jfw", "huge RLIMIT_STACK " << l.rlim_cur << " -> 8192K");
                l.rlim_cur = 8192 * 1024;
            }
            options.push_back(
                Option("-Xss" + OString::number(l.rlim_cur), nullptr));
        } else {
            int e = errno;
            SAL_WARN("jfw", "getrlimit(RLIMIT_STACK) failed with errno " << e);
        }
#endif
    }

    std::unique_ptr<JavaVMOption[]> sarOptions(new JavaVMOption[options.size()]);
    for (std::vector<Option>::size_type i = 0; i != options.size(); ++i) {
        SAL_INFO(
            "jfw",
            "VM option \"" << options[i].optionString << "\" "
                << options[i].extraInfo);
        sarOptions[i].optionString = const_cast<char *>(
            options[i].optionString.getStr());
        sarOptions[i].extraInfo = options[i].extraInfo;
    }

#ifdef MACOSX
    vm_args.version= JNI_VERSION_1_4; // issue 88987
#else
    vm_args.version= JNI_VERSION_1_2;
#endif
    vm_args.options= sarOptions.get();
    vm_args.nOptions= options.size(); //TODO overflow
    vm_args.ignoreUnrecognized= JNI_TRUE;

    /* We set a global flag which is used by the abort handler in order to
       determine whether it is  should use longjmp to get back into this function.
       That is, the abort handler determines if it is on the same stack as this function
       and then jumps back into this function.
    */
    g_bInGetJavaVM = 1;
    jint err;
    JavaVM * pJavaVM = nullptr;
    memset( jmp_jvm_abort, 0, sizeof(jmp_jvm_abort));
    int jmpval= setjmp( jmp_jvm_abort );
    /* If jmpval is not "0" then this point was reached by a longjmp in the
       abort_handler, which was called indirectly by JNI_CreateVM.
    */
    if( jmpval == 0)
    {
        //returns negative number on failure
        err= pCreateJavaVM(&pJavaVM, ppEnv, &vm_args);
        g_bInGetJavaVM = 0;
    }
    else
        // set err to a positive number, so as or recognize that an abort (longjmp)
        //occurred
        err= 1;

    if(err != 0)
    {
        if( err < 0)
        {
            fprintf(stderr,"[Java framework] sunjavaplugin" SAL_DLLEXTENSION
                    "Can not create Java Virtual Machine\n");
            errorcode = javaPluginError::VmCreationFailed;
        }
        else if( err > 0)
        {
            fprintf(stderr,"[Java framework] sunjavaplugin" SAL_DLLEXTENSION
                    "Can not create JavaVirtualMachine, abort handler was called.\n");
            errorcode = javaPluginError::VmCreationFailed;
        }
    }
    else
    {
        *ppVm = pJavaVM;
        JFW_TRACE2("JVM created");
    }
#else
    (void) arOptions;
    (void) cOptions;
    (void) ppEnv;
    // On Android we always have a Java VM as we only expect this code
    // to be run in an Android app anyway.
    *ppVm = lo_get_javavm();
    fprintf(stderr, "lo_get_javavm returns %p", *ppVm);
#endif

   return errorcode;
}

javaPluginError jfw_plugin_existJRE(const JavaInfo *pInfo, bool *exist)
{
    assert(pInfo != nullptr);
    assert(exist != nullptr);

    javaPluginError ret = javaPluginError::NONE;
    OUString sLocation(pInfo->sLocation);

    if (sLocation.isEmpty())
        return javaPluginError::InvalidArg;
    ::osl::DirectoryItem item;
    ::osl::File::RC rc_item = ::osl::DirectoryItem::get(sLocation, item);
    if (::osl::File::E_None == rc_item)
    {
        *exist = true;
    }
    else if (::osl::File::E_NOENT == rc_item)
    {
        *exist = false;
    }
    else
    {
        ret = javaPluginError::Error;
    }
    //We can have the situation that the JavaVM runtime library is not
    //contained within JAVA_HOME. Then the check for JAVA_HOME would return
    //true although the runtime library may not be loadable.
    //Or the JAVA_HOME directory of a deinstalled JRE left behind.
    if (ret == javaPluginError::NONE && *exist)
    {
        OUString sRuntimeLib = getRuntimeLib(pInfo->arVendorData);
        JFW_TRACE2("Checking existence of Java runtime library");

        ::osl::DirectoryItem itemRt;
        ::osl::File::RC rc_itemRt = ::osl::DirectoryItem::get(sRuntimeLib, itemRt);
        if (::osl::File::E_None == rc_itemRt)
        {
            *exist = true;
            JFW_TRACE2("Java runtime library exist: " << sRuntimeLib);

        }
        else if (::osl::File::E_NOENT == rc_itemRt)
        {
            *exist = false;
            JFW_TRACE2("Java runtime library does not exist: " << sRuntimeLib);
        }
        else
        {
            ret = javaPluginError::Error;
            JFW_TRACE2("Error while looking for Java runtime library: " << sRuntimeLib);
        }
    }
    return ret;
}


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