1 #include <stdio.h>
2 #include <stdlib.h>
3 #include <string.h>
4 #include <openssl/objects.h>
5 #include <openssl/comp.h>
6 #include <openssl/err.h>
7
8 COMP_METHOD *COMP_zlib(void );
9
10 static COMP_METHOD zlib_method_nozlib={
11 NID_undef,
12 "(undef)",
13 NULL,
14 NULL,
15 NULL,
16 NULL,
17 NULL,
18 NULL,
19 };
20
21 #ifndef ZLIB
22 #undef ZLIB_SHARED
23 #else
24
25 #include <zlib.h>
26
27 static int zlib_stateful_init(COMP_CTX *ctx);
28 static void zlib_stateful_finish(COMP_CTX *ctx);
29 static int zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out,
30 unsigned int olen, unsigned char *in, unsigned int ilen);
31 static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
32 unsigned int olen, unsigned char *in, unsigned int ilen);
33
34
35 /* memory allocations functions for zlib intialization */
36 static void* zlib_zalloc(void* opaque, unsigned int no, unsigned int size)
37 {
38 void *p;
39
40 p=OPENSSL_malloc(no*size);
41 if (p)
42 memset(p, 0, no*size);
43 return p;
44 }
45
46
47 static void zlib_zfree(void* opaque, void* address)
48 {
49 OPENSSL_free(address);
50 }
51
52 #if 0
53 static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
54 unsigned int olen, unsigned char *in, unsigned int ilen);
55 static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
56 unsigned int olen, unsigned char *in, unsigned int ilen);
57
58 static int zz_uncompress(Bytef *dest, uLongf *destLen, const Bytef *source,
59 uLong sourceLen);
60
61 static COMP_METHOD zlib_stateless_method={
62 NID_zlib_compression,
63 LN_zlib_compression,
64 NULL,
65 NULL,
66 zlib_compress_block,
67 zlib_expand_block,
68 NULL,
69 NULL,
70 };
71 #endif
72
73 static COMP_METHOD zlib_stateful_method={
74 NID_zlib_compression,
75 LN_zlib_compression,
76 zlib_stateful_init,
77 zlib_stateful_finish,
78 zlib_stateful_compress_block,
79 zlib_stateful_expand_block,
80 NULL,
81 NULL,
82 };
83
84 /*
85 * When OpenSSL is built on Windows, we do not want to require that
86 * the ZLIB.DLL be available in order for the OpenSSL DLLs to
87 * work. Therefore, all ZLIB routines are loaded at run time
88 * and we do not link to a .LIB file when ZLIB_SHARED is set.
89 */
90 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
91 # include <windows.h>
92 #endif /* !(OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32) */
93
94 #ifdef ZLIB_SHARED
95 #include <openssl/dso.h>
96
97 /* Function pointers */
98 typedef int (*compress_ft)(Bytef *dest,uLongf *destLen,
99 const Bytef *source, uLong sourceLen);
100 typedef int (*inflateEnd_ft)(z_streamp strm);
101 typedef int (*inflate_ft)(z_streamp strm, int flush);
102 typedef int (*inflateInit__ft)(z_streamp strm,
103 const char * version, int stream_size);
104 typedef int (*deflateEnd_ft)(z_streamp strm);
105 typedef int (*deflate_ft)(z_streamp strm, int flush);
106 typedef int (*deflateInit__ft)(z_streamp strm, int level,
107 const char * version, int stream_size);
108 typedef const char * (*zError__ft)(int err);
109 static compress_ft p_compress=NULL;
110 static inflateEnd_ft p_inflateEnd=NULL;
111 static inflate_ft p_inflate=NULL;
112 static inflateInit__ft p_inflateInit_=NULL;
113 static deflateEnd_ft p_deflateEnd=NULL;
114 static deflate_ft p_deflate=NULL;
115 static deflateInit__ft p_deflateInit_=NULL;
116 static zError__ft p_zError=NULL;
117
118 static int zlib_loaded = 0; /* only attempt to init func pts once */
119 static DSO *zlib_dso = NULL;
120
121 #define compress p_compress
122 #define inflateEnd p_inflateEnd
123 #define inflate p_inflate
124 #define inflateInit_ p_inflateInit_
125 #define deflateEnd p_deflateEnd
126 #define deflate p_deflate
127 #define deflateInit_ p_deflateInit_
128 #define zError p_zError
129 #endif /* ZLIB_SHARED */
130
131 struct zlib_state
132 {
133 z_stream istream;
134 z_stream ostream;
135 };
136
137 static int zlib_stateful_ex_idx = -1;
138
139 static int zlib_stateful_init(COMP_CTX *ctx)
140 {
141 int err;
142 struct zlib_state *state =
143 (struct zlib_state *)OPENSSL_malloc(sizeof(struct zlib_state));
144
145 if (state == NULL)
146 goto err;
147
148 state->istream.zalloc = zlib_zalloc;
149 state->istream.zfree = zlib_zfree;
150 state->istream.opaque = Z_NULL;
151 state->istream.next_in = Z_NULL;
152 state->istream.next_out = Z_NULL;
153 state->istream.avail_in = 0;
154 state->istream.avail_out = 0;
155 err = inflateInit_(&state->istream,
156 ZLIB_VERSION, sizeof(z_stream));
157 if (err != Z_OK)
158 goto err;
159
160 state->ostream.zalloc = zlib_zalloc;
161 state->ostream.zfree = zlib_zfree;
162 state->ostream.opaque = Z_NULL;
163 state->ostream.next_in = Z_NULL;
164 state->ostream.next_out = Z_NULL;
165 state->ostream.avail_in = 0;
166 state->ostream.avail_out = 0;
167 err = deflateInit_(&state->ostream,Z_DEFAULT_COMPRESSION,
168 ZLIB_VERSION, sizeof(z_stream));
169 if (err != Z_OK)
170 goto err;
171
172 CRYPTO_new_ex_data(CRYPTO_EX_INDEX_COMP,ctx,&ctx->ex_data);
173 CRYPTO_set_ex_data(&ctx->ex_data,zlib_stateful_ex_idx,state);
174 return 1;
175 err:
176 if (state) OPENSSL_free(state);
177 return 0;
178 }
179
180 static void zlib_stateful_finish(COMP_CTX *ctx)
181 {
182 struct zlib_state *state =
183 (struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
184 zlib_stateful_ex_idx);
185 inflateEnd(&state->istream);
186 deflateEnd(&state->ostream);
187 OPENSSL_free(state);
188 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_COMP,ctx,&ctx->ex_data);
189 }
190
191 static int zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out,
192 unsigned int olen, unsigned char *in, unsigned int ilen)
193 {
194 int err = Z_OK;
195 struct zlib_state *state =
196 (struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
197 zlib_stateful_ex_idx);
198
199 if (state == NULL)
200 return -1;
201
202 state->ostream.next_in = in;
203 state->ostream.avail_in = ilen;
204 state->ostream.next_out = out;
205 state->ostream.avail_out = olen;
206 if (ilen > 0)
207 err = deflate(&state->ostream, Z_SYNC_FLUSH);
208 if (err != Z_OK)
209 return -1;
210 #ifdef DEBUG_ZLIB
211 fprintf(stderr,"compress(%4d)->%4d %s\n",
212 ilen,olen - state->ostream.avail_out,
213 (ilen != olen - state->ostream.avail_out)?"zlib":"clear");
214 #endif
215 return olen - state->ostream.avail_out;
216 }
217
218 static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
219 unsigned int olen, unsigned char *in, unsigned int ilen)
220 {
221 int err = Z_OK;
222
223 struct zlib_state *state =
224 (struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
225 zlib_stateful_ex_idx);
226
227 if (state == NULL)
228 return 0;
229
230 state->istream.next_in = in;
231 state->istream.avail_in = ilen;
232 state->istream.next_out = out;
233 state->istream.avail_out = olen;
234 if (ilen > 0)
235 err = inflate(&state->istream, Z_SYNC_FLUSH);
236 if (err != Z_OK)
237 return -1;
238 #ifdef DEBUG_ZLIB
239 fprintf(stderr,"expand(%4d)->%4d %s\n",
240 ilen,olen - state->istream.avail_out,
241 (ilen != olen - state->istream.avail_out)?"zlib":"clear");
242 #endif
243 return olen - state->istream.avail_out;
244 }
245
246 #if 0
247 static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
248 unsigned int olen, unsigned char *in, unsigned int ilen)
249 {
250 unsigned long l;
251 int i;
252 int clear=1;
253
254 if (ilen > 128)
255 {
256 out[0]=1;
257 l=olen-1;
258 i=compress(&(out[1]),&l,in,(unsigned long)ilen);
259 if (i != Z_OK)
260 return(-1);
261 if (ilen > l)
262 {
263 clear=0;
264 l++;
265 }
266 }
267 if (clear)
268 {
269 out[0]=0;
270 memcpy(&(out[1]),in,ilen);
271 l=ilen+1;
272 }
273 #ifdef DEBUG_ZLIB
274 fprintf(stderr,"compress(%4d)->%4d %s\n",
275 ilen,(int)l,(clear)?"clear":"zlib");
276 #endif
277 return((int)l);
278 }
279
280 static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
281 unsigned int olen, unsigned char *in, unsigned int ilen)
282 {
283 unsigned long l;
284 int i;
285
286 if (in[0])
287 {
288 l=olen;
289 i=zz_uncompress(out,&l,&(in[1]),(unsigned long)ilen-1);
290 if (i != Z_OK)
291 return(-1);
292 }
293 else
294 {
295 memcpy(out,&(in[1]),ilen-1);
296 l=ilen-1;
297 }
298 #ifdef DEBUG_ZLIB
299 fprintf(stderr,"expand (%4d)->%4d %s\n",
300 ilen,(int)l,in[0]?"zlib":"clear");
301 #endif
302 return((int)l);
303 }
304
305 static int zz_uncompress (Bytef *dest, uLongf *destLen, const Bytef *source,
306 uLong sourceLen)
307 {
308 z_stream stream;
309 int err;
310
311 stream.next_in = (Bytef*)source;
312 stream.avail_in = (uInt)sourceLen;
313 /* Check for source > 64K on 16-bit machine: */
314 if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
315
316 stream.next_out = dest;
317 stream.avail_out = (uInt)*destLen;
318 if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
319
320 stream.zalloc = (alloc_func)0;
321 stream.zfree = (free_func)0;
322
323 err = inflateInit_(&stream,
324 ZLIB_VERSION, sizeof(z_stream));
325 if (err != Z_OK) return err;
326
327 err = inflate(&stream, Z_FINISH);
328 if (err != Z_STREAM_END) {
329 inflateEnd(&stream);
330 return err;
331 }
332 *destLen = stream.total_out;
333
334 err = inflateEnd(&stream);
335 return err;
336 }
337 #endif
338
339 #endif
340
341 COMP_METHOD *COMP_zlib(void)
342 {
343 COMP_METHOD *meth = &zlib_method_nozlib;
344
345 #ifdef ZLIB_SHARED
346 if (!zlib_loaded)
347 {
348 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
349 zlib_dso = DSO_load(NULL, "ZLIB1", NULL, 0);
350 #else
351 zlib_dso = DSO_load(NULL, "z", NULL, 0);
352 #endif
353 if (zlib_dso != NULL)
354 {
355 p_compress
356 = (compress_ft) DSO_bind_func(zlib_dso,
357 "compress");
358 p_inflateEnd
359 = (inflateEnd_ft) DSO_bind_func(zlib_dso,
360 "inflateEnd");
361 p_inflate
362 = (inflate_ft) DSO_bind_func(zlib_dso,
363 "inflate");
364 p_inflateInit_
365 = (inflateInit__ft) DSO_bind_func(zlib_dso,
366 "inflateInit_");
367 p_deflateEnd
368 = (deflateEnd_ft) DSO_bind_func(zlib_dso,
369 "deflateEnd");
370 p_deflate
371 = (deflate_ft) DSO_bind_func(zlib_dso,
372 "deflate");
373 p_deflateInit_
374 = (deflateInit__ft) DSO_bind_func(zlib_dso,
375 "deflateInit_");
376 p_zError
377 = (zError__ft) DSO_bind_func(zlib_dso,
378 "zError");
379
380 if (p_compress && p_inflateEnd && p_inflate
381 && p_inflateInit_ && p_deflateEnd
382 && p_deflate && p_deflateInit_ && p_zError)
383 zlib_loaded++;
384 }
385 }
386
387 #endif
388 #ifdef ZLIB_SHARED
389 if (zlib_loaded)
390 #endif
391 #if defined(ZLIB) || defined(ZLIB_SHARED)
392 {
393 /* init zlib_stateful_ex_idx here so that in a multi-process
394 * application it's enough to intialize openssl before forking
395 * (idx will be inherited in all the children) */
396 if (zlib_stateful_ex_idx == -1)
397 {
398 CRYPTO_w_lock(CRYPTO_LOCK_COMP);
399 if (zlib_stateful_ex_idx == -1)
400 zlib_stateful_ex_idx =
401 CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_COMP,
402 0,NULL,NULL,NULL,NULL);
403 CRYPTO_w_unlock(CRYPTO_LOCK_COMP);
404 if (zlib_stateful_ex_idx == -1)
405 goto err;
406 }
407
408 meth = &zlib_stateful_method;
409 }
410 err:
411 #endif
412
413 return(meth);
414 }
415
416 void COMP_zlib_cleanup(void)
417 {
418 #ifdef ZLIB_SHARED
419 if (zlib_dso)
420 DSO_free(zlib_dso);
421 #endif
422 }
423
424 #ifdef ZLIB
425
426 /* Zlib based compression/decompression filter BIO */
427
428 typedef struct
429 {
430 unsigned char *ibuf; /* Input buffer */
431 int ibufsize; /* Buffer size */
432 z_stream zin; /* Input decompress context */
433 unsigned char *obuf; /* Output buffer */
434 int obufsize; /* Output buffer size */
435 unsigned char *optr; /* Position in output buffer */
436 int ocount; /* Amount of data in output buffer */
437 int odone; /* deflate EOF */
438 int comp_level; /* Compression level to use */
439 z_stream zout; /* Output compression context */
440 } BIO_ZLIB_CTX;
441
442 #define ZLIB_DEFAULT_BUFSIZE 1024
443
444 static int bio_zlib_new(BIO *bi);
445 static int bio_zlib_free(BIO *bi);
446 static int bio_zlib_read(BIO *b, char *out, int outl);
447 static int bio_zlib_write(BIO *b, const char *in, int inl);
448 static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr);
449 static long bio_zlib_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp);
450
451 static BIO_METHOD bio_meth_zlib =
452 {
453 BIO_TYPE_COMP,
454 "zlib",
455 bio_zlib_write,
456 bio_zlib_read,
457 NULL,
458 NULL,
459 bio_zlib_ctrl,
460 bio_zlib_new,
461 bio_zlib_free,
462 bio_zlib_callback_ctrl
463 };
464
465 BIO_METHOD *BIO_f_zlib(void)
466 {
467 return &bio_meth_zlib;
468 }
469
470
471 static int bio_zlib_new(BIO *bi)
472 {
473 BIO_ZLIB_CTX *ctx;
474 #ifdef ZLIB_SHARED
475 (void)COMP_zlib();
476 if (!zlib_loaded)
477 {
478 COMPerr(COMP_F_BIO_ZLIB_NEW, COMP_R_ZLIB_NOT_SUPPORTED);
479 return 0;
480 }
481 #endif
482 ctx = OPENSSL_malloc(sizeof(BIO_ZLIB_CTX));
483 if(!ctx)
484 {
485 COMPerr(COMP_F_BIO_ZLIB_NEW, ERR_R_MALLOC_FAILURE);
486 return 0;
487 }
488 ctx->ibuf = NULL;
489 ctx->obuf = NULL;
490 ctx->ibufsize = ZLIB_DEFAULT_BUFSIZE;
491 ctx->obufsize = ZLIB_DEFAULT_BUFSIZE;
492 ctx->zin.zalloc = Z_NULL;
493 ctx->zin.zfree = Z_NULL;
494 ctx->zin.next_in = NULL;
495 ctx->zin.avail_in = 0;
496 ctx->zin.next_out = NULL;
497 ctx->zin.avail_out = 0;
498 ctx->zout.zalloc = Z_NULL;
499 ctx->zout.zfree = Z_NULL;
500 ctx->zout.next_in = NULL;
501 ctx->zout.avail_in = 0;
502 ctx->zout.next_out = NULL;
503 ctx->zout.avail_out = 0;
504 ctx->odone = 0;
505 ctx->comp_level = Z_DEFAULT_COMPRESSION;
506 bi->init = 1;
507 bi->ptr = (char *)ctx;
508 bi->flags = 0;
509 return 1;
510 }
511
512 static int bio_zlib_free(BIO *bi)
513 {
514 BIO_ZLIB_CTX *ctx;
515 if(!bi) return 0;
516 ctx = (BIO_ZLIB_CTX *)bi->ptr;
517 if(ctx->ibuf)
518 {
519 /* Destroy decompress context */
520 inflateEnd(&ctx->zin);
521 OPENSSL_free(ctx->ibuf);
522 }
523 if(ctx->obuf)
524 {
525 /* Destroy compress context */
526 deflateEnd(&ctx->zout);
527 OPENSSL_free(ctx->obuf);
528 }
529 OPENSSL_free(ctx);
530 bi->ptr = NULL;
531 bi->init = 0;
532 bi->flags = 0;
533 return 1;
534 }
535
536 static int bio_zlib_read(BIO *b, char *out, int outl)
537 {
538 BIO_ZLIB_CTX *ctx;
539 int ret;
540 z_stream *zin;
541 if(!out || !outl) return 0;
542 ctx = (BIO_ZLIB_CTX *)b->ptr;
543 zin = &ctx->zin;
544 BIO_clear_retry_flags(b);
545 if(!ctx->ibuf)
546 {
547 ctx->ibuf = OPENSSL_malloc(ctx->ibufsize);
548 if(!ctx->ibuf)
549 {
550 COMPerr(COMP_F_BIO_ZLIB_READ, ERR_R_MALLOC_FAILURE);
551 return 0;
552 }
553 inflateInit(zin);
554 zin->next_in = ctx->ibuf;
555 zin->avail_in = 0;
556 }
557
558 /* Copy output data directly to supplied buffer */
559 zin->next_out = (unsigned char *)out;
560 zin->avail_out = (unsigned int)outl;
561 for(;;)
562 {
563 /* Decompress while data available */
564 while(zin->avail_in)
565 {
566 ret = inflate(zin, 0);
567 if((ret != Z_OK) && (ret != Z_STREAM_END))
568 {
569 COMPerr(COMP_F_BIO_ZLIB_READ,
570 COMP_R_ZLIB_INFLATE_ERROR);
571 ERR_add_error_data(2, "zlib error:",
572 zError(ret));
573 return 0;
574 }
575 /* If EOF or we've read everything then return */
576 if((ret == Z_STREAM_END) || !zin->avail_out)
577 return outl - zin->avail_out;
578 }
579
580 /* No data in input buffer try to read some in,
581 * if an error then return the total data read.
582 */
583 ret = BIO_read(b->next_bio, ctx->ibuf, ctx->ibufsize);
584 if(ret <= 0)
585 {
586 /* Total data read */
587 int tot = outl - zin->avail_out;
588 BIO_copy_next_retry(b);
589 if(ret < 0) return (tot > 0) ? tot : ret;
590 return tot;
591 }
592 zin->avail_in = ret;
593 zin->next_in = ctx->ibuf;
594 }
595 }
596
597 static int bio_zlib_write(BIO *b, const char *in, int inl)
598 {
599 BIO_ZLIB_CTX *ctx;
600 int ret;
601 z_stream *zout;
602 if(!in || !inl) return 0;
603 ctx = (BIO_ZLIB_CTX *)b->ptr;
604 if(ctx->odone) return 0;
605 zout = &ctx->zout;
606 BIO_clear_retry_flags(b);
607 if(!ctx->obuf)
608 {
609 ctx->obuf = OPENSSL_malloc(ctx->obufsize);
610 /* Need error here */
611 if(!ctx->obuf)
612 {
613 COMPerr(COMP_F_BIO_ZLIB_WRITE, ERR_R_MALLOC_FAILURE);
614 return 0;
615 }
616 ctx->optr = ctx->obuf;
617 ctx->ocount = 0;
618 deflateInit(zout, ctx->comp_level);
619 zout->next_out = ctx->obuf;
620 zout->avail_out = ctx->obufsize;
621 }
622 /* Obtain input data directly from supplied buffer */
623 zout->next_in = (void *)in;
624 zout->avail_in = inl;
625 for(;;)
626 {
627 /* If data in output buffer write it first */
628 while(ctx->ocount) {
629 ret = BIO_write(b->next_bio, ctx->optr, ctx->ocount);
630 if(ret <= 0)
631 {
632 /* Total data written */
633 int tot = inl - zout->avail_in;
634 BIO_copy_next_retry(b);
635 if(ret < 0) return (tot > 0) ? tot : ret;
636 return tot;
637 }
638 ctx->optr += ret;
639 ctx->ocount -= ret;
640 }
641
642 /* Have we consumed all supplied data? */
643 if(!zout->avail_in)
644 return inl;
645
646 /* Compress some more */
647
648 /* Reset buffer */
649 ctx->optr = ctx->obuf;
650 zout->next_out = ctx->obuf;
651 zout->avail_out = ctx->obufsize;
652 /* Compress some more */
653 ret = deflate(zout, 0);
654 if(ret != Z_OK)
655 {
656 COMPerr(COMP_F_BIO_ZLIB_WRITE,
657 COMP_R_ZLIB_DEFLATE_ERROR);
658 ERR_add_error_data(2, "zlib error:", zError(ret));
659 return 0;
660 }
661 ctx->ocount = ctx->obufsize - zout->avail_out;
662 }
663 }
664
665 static int bio_zlib_flush(BIO *b)
666 {
667 BIO_ZLIB_CTX *ctx;
668 int ret;
669 z_stream *zout;
670 ctx = (BIO_ZLIB_CTX *)b->ptr;
671 /* If no data written or already flush show success */
672 if(!ctx->obuf || (ctx->odone && !ctx->ocount)) return 1;
673 zout = &ctx->zout;
674 BIO_clear_retry_flags(b);
675 /* No more input data */
676 zout->next_in = NULL;
677 zout->avail_in = 0;
678 for(;;)
679 {
680 /* If data in output buffer write it first */
681 while(ctx->ocount)
682 {
683 ret = BIO_write(b->next_bio, ctx->optr, ctx->ocount);
684 if(ret <= 0)
685 {
686 BIO_copy_next_retry(b);
687 return ret;
688 }
689 ctx->optr += ret;
690 ctx->ocount -= ret;
691 }
692 if(ctx->odone) return 1;
693
694 /* Compress some more */
695
696 /* Reset buffer */
697 ctx->optr = ctx->obuf;
698 zout->next_out = ctx->obuf;
699 zout->avail_out = ctx->obufsize;
700 /* Compress some more */
701 ret = deflate(zout, Z_FINISH);
702 if(ret == Z_STREAM_END) ctx->odone = 1;
703 else if(ret != Z_OK)
704 {
705 COMPerr(COMP_F_BIO_ZLIB_FLUSH,
706 COMP_R_ZLIB_DEFLATE_ERROR);
707 ERR_add_error_data(2, "zlib error:", zError(ret));
708 return 0;
709 }
710 ctx->ocount = ctx->obufsize - zout->avail_out;
711 }
712 }
713
714 static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr)
715 {
716 BIO_ZLIB_CTX *ctx;
717 int ret, *ip;
718 int ibs, obs;
719 if(!b->next_bio) return 0;
720 ctx = (BIO_ZLIB_CTX *)b->ptr;
721 switch (cmd)
722 {
723
724 case BIO_CTRL_RESET:
725 ctx->ocount = 0;
726 ctx->odone = 0;
727 ret = 1;
728 break;
729
730 case BIO_CTRL_FLUSH:
731 ret = bio_zlib_flush(b);
732 if (ret > 0)
733 ret = BIO_flush(b->next_bio);
734 break;
735
736 case BIO_C_SET_BUFF_SIZE:
737 ibs = -1;
738 obs = -1;
739 if (ptr != NULL)
740 {
741 ip = ptr;
742 if (*ip == 0)
743 ibs = (int) num;
744 else
745 obs = (int) num;
746 }
747 else
748 {
749 ibs = (int)num;
750 obs = ibs;
751 }
752
753 if (ibs != -1)
754 {
755 if (ctx->ibuf)
756 {
757 OPENSSL_free(ctx->ibuf);
758 ctx->ibuf = NULL;
759 }
760 ctx->ibufsize = ibs;
761 }
762
763 if (obs != -1)
764 {
765 if (ctx->obuf)
766 {
767 OPENSSL_free(ctx->obuf);
768 ctx->obuf = NULL;
769 }
770 ctx->obufsize = obs;
771 }
772 ret = 1;
773 break;
774
775 case BIO_C_DO_STATE_MACHINE:
776 BIO_clear_retry_flags(b);
777 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
778 BIO_copy_next_retry(b);
779 break;
780
781 default:
782 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
783 break;
784
785 }
786
787 return ret;
788 }
789
790
791 static long bio_zlib_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
792 {
793 if(!b->next_bio)
794 return 0;
795 return
796 BIO_callback_ctrl(b->next_bio, cmd, fp);
797 }
798
799 #endif