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
/* -*- 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 <sal/config.h>

#include <stdlib.h>

#include <jni.h>
#include <osl/security.h>
#include <osl/pipe.h>

/* On Windows, jpipe.dll must not have static dependencies on any other URE DLLs
   (sal3.dll, uwinapi.dll), as Java System.LoadLibrary could otherwise not load
   it.  Therefore, on Windows, this code goes into a jpipx.dll that the jpipe.dll
   wrapper loads with LoadLibraryEx(LOAD_WITH_ALTERED_SEARCH_PATH).
   The function names in this wrapped code are truncated from the long JNICALL
   names, as JNICALL causes some "@N" with different numeric values for
   N (and probably different across 32 and 64 bit) to be added to the symbol
   names, which the calls to GetProcAddress in wrapper/wrapper.c would otherwise
   have to take into account.
*/

/*****************************************************************************/
/* exception macros */

static void ThrowException(JNIEnv * env, char const * type, char const * msg) {
    jclass c;
    (*env)->ExceptionClear(env);
    c = (*env)->FindClass(env, type);
    if (c == NULL) {
        (*env)->ExceptionClear(env);
        (*env)->FatalError(env, "JNI FindClass failed");
    }
    if ((*env)->ThrowNew(env, c, msg) != 0) {
        (*env)->ExceptionClear(env);
        (*env)->FatalError(env, "JNI ThrowNew failed");
    }
}

/*****************************************************************************/
/* helper functions prototypes */

static oslPipe getPipe(JNIEnv * env, jobject obj_this);
static rtl_uString * jstring2ustring(JNIEnv * env, jstring jstr);

/*****************************************************************************/
/* get pipe */

static oslPipe getPipe(JNIEnv * env, jobject obj_this)
{
    jclass      tclass;
    jfieldID    fid;
    tclass  = (*env)->GetObjectClass(env, obj_this);
    if (tclass == NULL)
    {
        ThrowException(env,
                       "java/lang/RuntimeException",
                       "native pipe cannot find class");
        return NULL;
    }

    fid     = (*env)->GetFieldID(env, tclass, "_nPipeHandle", "J");
    if (fid == NULL)
    {
        ThrowException(env,
                       "java/lang/RuntimeException",
                       "native pipe cannot find field");
        return NULL;
    }
    return (oslPipe) SAL_INT_CAST(
        sal_IntPtr, (*env)->GetLongField(env, obj_this, fid));
}

/*****************************************************************************/
/* convert jstring to rtl_uString */

static rtl_uString * jstring2ustring(JNIEnv * env, jstring jstr)
{
    const char *    cstr;
    rtl_uString *   ustr    = NULL;
    cstr    = (*env)->GetStringUTFChars(env, jstr, NULL);
    rtl_uString_newFromAscii(&ustr, cstr);
    (*env)->ReleaseStringUTFChars(env, jstr, cstr);
    return ustr;
}

/*****************************************************************************/
/*
 * Class:     com_sun_star_lib_connections_pipe_PipeConnection
 * Method:    connect
 * Signature: (Lcom/sun/star/beans/NativeService;)V
 */
SAL_DLLPUBLIC_EXPORT void
#if defined(_WIN32)
PipeConnection_create<--- The function 'PipeConnection_create' is never used.
#else
JNICALL Java_com_sun_star_lib_connections_pipe_PipeConnection_createJNI<--- The function 'Java_com_sun_star_lib_connections_pipe_PipeConnection_createJNI' is never used.
#endif
  (JNIEnv * env, jobject obj_this, jstring name)
{
    enum {
        START   = 0,
        INMONITOR,
        GOTNAME,
        CREATED
    };

    short       state   = START;

    jclass      tclass;
    jfieldID    fid;

    oslSecurity     psec    = osl_getCurrentSecurity();
    oslPipe         npipe   = NULL;
    rtl_uString *   pname   = NULL;
    if ((*env)->MonitorEnter(env, obj_this) != 0)
    {
        ThrowException(env,
                       "java/lang/RuntimeException",
                       "native pipe cannot synchronize on the object");
        goto error;
    }
    state   = INMONITOR;

    /* check connection state */
    npipe   = getPipe(env, obj_this);
    if ((*env)->ExceptionOccurred(env) != NULL)
        goto error;
    if (npipe != NULL)
    {
        ThrowException(env,
                       "com/sun/star/io/IOException",
                       "native pipe is already connected");
        goto error;
    }

    /* save the pipe name */
    tclass  = (*env)->GetObjectClass(env, obj_this);
    if (tclass == NULL)
    {
        ThrowException(env,
                       "java/lang/RuntimeException",
                       "native pipe cannot find class");
        goto error;
    }

    fid     = (*env)->GetFieldID(env, tclass,
                                 "_aDescription", "Ljava/lang/String;");
    if (fid == NULL)
    {
        ThrowException(env,
                       "java/lang/RuntimeException",
                       "native pipe cannot find field");
        goto error;
    }

    (*env)->SetObjectField(env, obj_this, fid, (jobject)name);

    /* convert pipe name to rtl_uString */
    pname   = jstring2ustring(env, name);
    if (pname == NULL)
    {
        ThrowException(env,
                       "java/lang/RuntimeException",
                       "native pipe cannot convert name");
        goto error;
    }
    state   = GOTNAME;

    /* try to connect */
    npipe   = osl_createPipe(pname, osl_Pipe_OPEN, psec);
    if (npipe == NULL)
    {
        ThrowException(env,
                       "java/lang/RuntimeException",
                       "cannot create native pipe");
        goto error;
    }
    state   = CREATED;

    /* save the pipe */
    tclass  = (*env)->GetObjectClass(env, obj_this);
    if (tclass == NULL)
    {
        ThrowException(env,
                       "java/lang/RuntimeException",
                       "native pipe cannot find class");
        goto error;
    }

    fid     = (*env)->GetFieldID(env, tclass, "_nPipeHandle", "J");
    if (fid == NULL)
    {
        ThrowException(env,
                       "java/lang/RuntimeException",
                       "native pipe cannot find field");
        goto error;
    }
    (*env)->SetLongField(
        env, obj_this, fid, SAL_INT_CAST(jlong, (sal_IntPtr) npipe));

    /* done */
    rtl_uString_release(pname);
    (*env)->MonitorExit(env, obj_this);
    osl_freeSecurityHandle(psec);
    return;

 error:
    switch (state)
    {
        case CREATED:
            osl_closePipe(npipe);
            osl_releasePipe(npipe);
            /* fall through */
        case GOTNAME:
            rtl_uString_release(pname);
            /* fall through */
        case INMONITOR:
            (*env)->MonitorExit(env, obj_this);
            /* fall through */
        case START:
            osl_freeSecurityHandle(psec);
        default:
            break;
    }
    return;
}

/*****************************************************************************/
/*
 * Class:     com_sun_star_lib_connections_pipe_PipeConnection
 * Method:    closeJNI
 * Signature: ()V
 */
SAL_DLLPUBLIC_EXPORT void
#if defined(_WIN32)
PipeConnection_close<--- The function 'PipeConnection_close' is never used.
#else
JNICALL Java_com_sun_star_lib_connections_pipe_PipeConnection_closeJNI<--- The function 'Java_com_sun_star_lib_connections_pipe_PipeConnection_closeJNI' is never used.
#endif
  (JNIEnv * env, jobject obj_this)
{
    enum {
        START   = 0,
        INMONITOR
    };

    short       state   = START;
    oslPipe     npipe;      /* native pipe */
    jclass      tclass;     /* this class */
    jfieldID    fid;        /* a field identifier */

    if ((*env)->MonitorEnter(env, obj_this) != 0)
    {
        ThrowException(env,
                       "java/lang/RuntimeException",
                       "native pipe cannot synchronize on the object");
        goto error;
    }
    state   = INMONITOR;

    /* check connection state */
    npipe   = getPipe(env, obj_this);
    if ((*env)->ExceptionOccurred(env) != NULL)
        goto error;
    if (npipe == NULL)
    {
        ThrowException(env,
                       "com/sun/star/io/IOException",
                       "native pipe is not connected");
        goto error;
    }

    /* remove the reference to the pipe */
    tclass  = (*env)->GetObjectClass(env, obj_this);
    if (tclass == NULL)
    {
        ThrowException(env,
                       "java/lang/RuntimeException",
                       "native pipe cannot find class");
        goto error;
    }

    fid     = (*env)->GetFieldID(env, tclass, "_nPipeHandle", "J");
    if (fid == NULL)
    {
        ThrowException(env,
                       "java/lang/RuntimeException",
                       "native pipe cannot find field");
        goto error;
    }

    (*env)->SetLongField(env, obj_this, fid, (jlong)0);

    /* release the pipe */
    osl_closePipe(npipe);
    osl_releasePipe(npipe);

    /* done */
    (*env)->MonitorExit(env, obj_this);
    return;

 error:
    switch (state)
    {
        case INMONITOR:
            (*env)->MonitorExit(env, obj_this);
        case START:
        default:
            break;
    }
    return;
}

/*****************************************************************************/
/*
 * Class:     com_sun_star_lib_connections_pipe_PipeConnection
 * Method:    readJNI
 * Signature: ([[BI)I
 */
SAL_DLLPUBLIC_EXPORT jint
#if defined(_WIN32)
PipeConnection_read<--- The function 'PipeConnection_read' is never used.
#else
JNICALL Java_com_sun_star_lib_connections_pipe_PipeConnection_readJNI<--- The function 'Java_com_sun_star_lib_connections_pipe_PipeConnection_readJNI' is never used.
#endif
  (JNIEnv * env, jobject obj_this, jobjectArray buffer, jint len)
{
    enum {
        START   = 0,
        INMONITOR,
        ACQUIRED,
        GOTBUFFER
    };

    short       state   = START;
    oslPipe     npipe;          /* native pipe */
    void *      nbuff = NULL;   /* native read buffer */
    jbyteArray  bytes;          /* java read buffer */
    jint        nread;          /* number of bytes has been read */

    /* enter monitor */
    if ((*env)->MonitorEnter(env, obj_this) != 0)
    {
        ThrowException(env,
                       "java/lang/RuntimeException",
                       "native pipe cannot synchronize on the object");
        goto error;
    }
    state = INMONITOR;

    /* check connection state */
    npipe   = getPipe(env, obj_this);
    if ((*env)->ExceptionOccurred(env) != NULL)
        goto error;
    if (npipe == NULL)
    {
        ThrowException(env,
                       "com/sun/star/io/IOException",
                       "native pipe is not connected");
        goto error;
    }

    /* acquire pipe */
    osl_acquirePipe( npipe );
    state = ACQUIRED;

    /* allocate a buffer */
    if ((nbuff = malloc(len)) == NULL)
    {
        ThrowException(env,
                       "java/lang/RuntimeException",
                       "native pipe out of memory");
        goto error;
    }

    state = GOTBUFFER;<--- Condition 'state>=ACQUIRED' is always true

    /* exit monitor */
    (*env)->MonitorExit(env, obj_this);

    /* reading */
    nread = osl_readPipe(npipe, nbuff, len);

    /* enter monitor again */
    if ((*env)->MonitorEnter(env, obj_this) != 0)
    {
        ThrowException(env,
                       "java/lang/RuntimeException",
                       "native pipe cannot synchronize on the object");
        goto error;
    }

    /* copy buffer */
    if (nread >= 0)
    {
        bytes   = (*env)->NewByteArray(env, len);
        if (bytes == NULL)
        {
            ThrowException(env,
                           "java/lang/RuntimeException",
                           "native pipe out of memory");
            goto error;
        }

        /* save the data */
        (*env)->SetByteArrayRegion(env, bytes, 0, len, nbuff);
        (*env)->SetObjectArrayElement(env, buffer, 0, bytes);
        (*env)->DeleteLocalRef(env, bytes);
    }

    /* done */
    free(nbuff);
    if ( state >= ACQUIRED )
        osl_releasePipe( npipe );

    /* exit monitor */
    (*env)->MonitorExit(env, obj_this);
    return nread;

 error:
    switch (state)
    {
        case GOTBUFFER:
            free(nbuff);
            /* fall-through */
        case INMONITOR:
            (*env)->MonitorExit(env, obj_this);
        case START:
        default:
            break;
    }
    return -1;
}

/*****************************************************************************/
/*
 * Class:     com_sun_star_lib_connections_pipe_PipeConnection
 * Method:    writeJNI
 * Signature: ([B)V
 */
SAL_DLLPUBLIC_EXPORT void
#if defined(_WIN32)
PipeConnection_write<--- The function 'PipeConnection_write' is never used.
#else
JNICALL Java_com_sun_star_lib_connections_pipe_PipeConnection_writeJNI<--- The function 'Java_com_sun_star_lib_connections_pipe_PipeConnection_writeJNI' is never used.
#endif
  (JNIEnv * env, jobject obj_this, jbyteArray buffer)
{
    enum {
        START   = 0,
        INMONITOR,
        GOTBUFFER
    };

    short   state   = START;
    oslPipe npipe;          /* native pipe */
    sal_Int32 count;        /* number of bytes has been written */
    jsize   nwrite;         /* number of bytes to write */
    jbyte * nbuff = NULL;   /* native buffer */

    if ((*env)->MonitorEnter(env, obj_this) != 0)
    {
        ThrowException(env,
                       "java/lang/RuntimeException",
                       "native pipe cannot synchronize on the object");
        goto error;
    }
    state   = INMONITOR;

    /* check connection state */
    npipe   = getPipe(env, obj_this);
    if ((*env)->ExceptionOccurred(env) != NULL)
        goto error;
    if (npipe == NULL)
    {
        ThrowException(env,
                       "com/sun/star/io/IOException",
                       "native pipe is not connected");
        goto error;
    }

    nwrite  = (*env)->GetArrayLength(env, buffer);
    if (nwrite > 0)
    {
        nbuff   = (*env)->GetByteArrayElements(env, buffer, NULL);
        if (nbuff == NULL)
        {
            ThrowException(env,
                           "java/lang/RuntimeException",
                           "native pipe out of memory");
            goto error;
        }
        state   = GOTBUFFER;

        (*env)->MonitorExit(env, obj_this);
        /* writing */
        count   = osl_writePipe(npipe, nbuff, nwrite);
        if ((*env)->MonitorEnter(env, obj_this) != 0)
        {
            ThrowException(env,
                           "java/lang/RuntimeException",
                           "native pipe cannot synchronize on the object");
            goto error;
        }
        if (count != nwrite)
        {
            ThrowException(env,
                           "com/sun/star/io/IOException",
                           "native pipe: failed to write");
            goto error;
        }
    }
    /* done */
    (*env)->ReleaseByteArrayElements(env, buffer, nbuff, JNI_ABORT);
    (*env)->MonitorExit(env, obj_this);
    return;

 error:
    switch (state)
    {
        case GOTBUFFER:
            (*env)->ReleaseByteArrayElements(env, buffer, nbuff, JNI_ABORT);
            /* fall through */
        case INMONITOR:
            (*env)->MonitorExit(env, obj_this);
        case START:
        default:
            break;
    }
    return;
}

/*****************************************************************************/
/*
 * Class:     com_sun_star_lib_connections_pipe_PipeConnection
 * Method:    flushJNI
 * Signature: ()V
 */
SAL_DLLPUBLIC_EXPORT void
#if defined(_WIN32)
PipeConnection_flush<--- The function 'PipeConnection_flush' is never used.
#else
JNICALL Java_com_sun_star_lib_connections_pipe_PipeConnection_flushJNI<--- The function 'Java_com_sun_star_lib_connections_pipe_PipeConnection_flushJNI' is never used.
#endif
  (JNIEnv * env, jobject obj_this)
{
    (void) env; /* not used */
    (void) obj_this; /* not used */
    return;
}

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