1 /*
2 * Copyright 1998-2023 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10 #include <stdio.h>
11 #include <stdlib.h>
12 #include <string.h>
13 #include <openssl/objects.h>
14 #include "internal/comp.h"
15 #include <openssl/err.h>
16 #include "crypto/cryptlib.h"
17 #include "internal/bio.h"
18 #include "internal/thread_once.h"
19 #include "comp_local.h"
20
21 COMP_METHOD *COMP_zlib(void);
22
23 #ifdef OPENSSL_NO_ZLIB
24 # undef ZLIB_SHARED
25 #else
26
27 # include <zlib.h>
28
29 static int zlib_stateful_init(COMP_CTX *ctx);
30 static void zlib_stateful_finish(COMP_CTX *ctx);
31 static ossl_ssize_t zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out,
32 size_t olen, unsigned char *in,
33 size_t ilen);
34 static ossl_ssize_t zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
35 size_t olen, unsigned char *in,
36 size_t ilen);
37
38 /* memory allocations functions for zlib initialisation */
zlib_zalloc(void * opaque,unsigned int no,unsigned int size)39 static void *zlib_zalloc(void *opaque, unsigned int no, unsigned int size)
40 {
41 void *p;
42
43 p = OPENSSL_zalloc(no * size);
44 return p;
45 }
46
zlib_zfree(void * opaque,void * address)47 static void zlib_zfree(void *opaque, void *address)
48 {
49 OPENSSL_free(address);
50 }
51
52
53 static COMP_METHOD zlib_stateful_method = {
54 NID_zlib_compression,
55 LN_zlib_compression,
56 zlib_stateful_init,
57 zlib_stateful_finish,
58 zlib_stateful_compress_block,
59 zlib_stateful_expand_block
60 };
61
62 /*
63 * When OpenSSL is built on Windows, we do not want to require that
64 * the ZLIB.DLL be available in order for the OpenSSL DLLs to
65 * work. Therefore, all ZLIB routines are loaded at run time
66 * and we do not link to a .LIB file when ZLIB_SHARED is set.
67 */
68 # if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
69 # include <windows.h>
70 # endif /* !(OPENSSL_SYS_WINDOWS ||
71 * OPENSSL_SYS_WIN32) */
72
73 # ifdef ZLIB_SHARED
74 # include "internal/dso.h"
75
76 /* Function pointers */
77 typedef int (*compress_ft) (Bytef *dest, uLongf *destLen,
78 const Bytef *source, uLong sourceLen);
79 typedef int (*uncompress_ft) (Bytef *dest, uLongf *destLen,
80 const Bytef *source, uLong sourceLen);
81 typedef int (*inflateEnd_ft) (z_streamp strm);
82 typedef int (*inflate_ft) (z_streamp strm, int flush);
83 typedef int (*inflateInit__ft) (z_streamp strm,
84 const char *version, int stream_size);
85 typedef int (*deflateEnd_ft) (z_streamp strm);
86 typedef int (*deflate_ft) (z_streamp strm, int flush);
87 typedef int (*deflateInit__ft) (z_streamp strm, int level,
88 const char *version, int stream_size);
89 typedef const char *(*zError__ft) (int err);
90 static compress_ft p_compress = NULL;
91 static uncompress_ft p_uncompress = NULL;
92 static inflateEnd_ft p_inflateEnd = NULL;
93 static inflate_ft p_inflate = NULL;
94 static inflateInit__ft p_inflateInit_ = NULL;
95 static deflateEnd_ft p_deflateEnd = NULL;
96 static deflate_ft p_deflate = NULL;
97 static deflateInit__ft p_deflateInit_ = NULL;
98 static zError__ft p_zError = NULL;
99
100 static DSO *zlib_dso = NULL;
101
102 # define compress p_compress
103 # define uncompress p_uncompress
104 # define inflateEnd p_inflateEnd
105 # define inflate p_inflate
106 # define inflateInit_ p_inflateInit_
107 # define deflateEnd p_deflateEnd
108 # define deflate p_deflate
109 # define deflateInit_ p_deflateInit_
110 # define zError p_zError
111 # endif /* ZLIB_SHARED */
112
113 struct zlib_state {
114 z_stream istream;
115 z_stream ostream;
116 };
117
zlib_stateful_init(COMP_CTX * ctx)118 static int zlib_stateful_init(COMP_CTX *ctx)
119 {
120 int err;
121 struct zlib_state *state = OPENSSL_zalloc(sizeof(*state));
122
123 if (state == NULL)
124 goto err;
125
126 state->istream.zalloc = zlib_zalloc;
127 state->istream.zfree = zlib_zfree;
128 state->istream.opaque = Z_NULL;
129 state->istream.next_in = Z_NULL;
130 state->istream.next_out = Z_NULL;
131 err = inflateInit_(&state->istream, ZLIB_VERSION, sizeof(z_stream));
132 if (err != Z_OK)
133 goto err;
134
135 state->ostream.zalloc = zlib_zalloc;
136 state->ostream.zfree = zlib_zfree;
137 state->ostream.opaque = Z_NULL;
138 state->ostream.next_in = Z_NULL;
139 state->ostream.next_out = Z_NULL;
140 err = deflateInit_(&state->ostream, Z_DEFAULT_COMPRESSION,
141 ZLIB_VERSION, sizeof(z_stream));
142 if (err != Z_OK)
143 goto err;
144
145 ctx->data = state;
146 return 1;
147 err:
148 OPENSSL_free(state);
149 return 0;
150 }
151
zlib_stateful_finish(COMP_CTX * ctx)152 static void zlib_stateful_finish(COMP_CTX *ctx)
153 {
154 struct zlib_state *state = ctx->data;
155 inflateEnd(&state->istream);
156 deflateEnd(&state->ostream);
157 OPENSSL_free(state);
158 }
159
zlib_stateful_compress_block(COMP_CTX * ctx,unsigned char * out,size_t olen,unsigned char * in,size_t ilen)160 static ossl_ssize_t zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out,
161 size_t olen, unsigned char *in,
162 size_t ilen)
163 {
164 int err = Z_OK;
165 struct zlib_state *state = ctx->data;
166
167 if (state == NULL)
168 return -1;
169
170 state->ostream.next_in = in;
171 state->ostream.avail_in = ilen;
172 state->ostream.next_out = out;
173 state->ostream.avail_out = olen;
174 if (ilen > 0)
175 err = deflate(&state->ostream, Z_SYNC_FLUSH);
176 if (err != Z_OK)
177 return -1;
178 if (state->ostream.avail_out > olen)
179 return -1;
180 return (ossl_ssize_t)(olen - state->ostream.avail_out);
181 }
182
zlib_stateful_expand_block(COMP_CTX * ctx,unsigned char * out,size_t olen,unsigned char * in,size_t ilen)183 static ossl_ssize_t zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
184 size_t olen, unsigned char *in,
185 size_t ilen)
186 {
187 int err = Z_OK;
188 struct zlib_state *state = ctx->data;
189
190 if (state == NULL)
191 return 0;
192
193 state->istream.next_in = in;
194 state->istream.avail_in = ilen;
195 state->istream.next_out = out;
196 state->istream.avail_out = olen;
197 if (ilen > 0)
198 err = inflate(&state->istream, Z_SYNC_FLUSH);
199 if (err != Z_OK)
200 return -1;
201 if (state->istream.avail_out > olen)
202 return -1;
203 return (ossl_ssize_t)(olen - state->istream.avail_out);
204 }
205
206 /* ONESHOT COMPRESSION/DECOMPRESSION */
207
zlib_oneshot_init(COMP_CTX * ctx)208 static int zlib_oneshot_init(COMP_CTX *ctx)
209 {
210 return 1;
211 }
212
zlib_oneshot_finish(COMP_CTX * ctx)213 static void zlib_oneshot_finish(COMP_CTX *ctx)
214 {
215 }
216
zlib_oneshot_compress_block(COMP_CTX * ctx,unsigned char * out,size_t olen,unsigned char * in,size_t ilen)217 static ossl_ssize_t zlib_oneshot_compress_block(COMP_CTX *ctx, unsigned char *out,
218 size_t olen, unsigned char *in,
219 size_t ilen)
220 {
221 uLongf out_size;
222
223 if (ilen == 0)
224 return 0;
225
226 /* zlib's uLongf defined as unsigned long FAR */
227 if (olen > ULONG_MAX)
228 return -1;
229 out_size = (uLongf)olen;
230
231 if (compress(out, &out_size, in, ilen) != Z_OK)
232 return -1;
233
234 if (out_size > OSSL_SSIZE_MAX)
235 return -1;
236 return (ossl_ssize_t)out_size;
237 }
238
zlib_oneshot_expand_block(COMP_CTX * ctx,unsigned char * out,size_t olen,unsigned char * in,size_t ilen)239 static ossl_ssize_t zlib_oneshot_expand_block(COMP_CTX *ctx, unsigned char *out,
240 size_t olen, unsigned char *in,
241 size_t ilen)
242 {
243 uLongf out_size;
244
245 if (ilen == 0)
246 return 0;
247
248 /* zlib's uLongf defined as unsigned long FAR */
249 if (olen > ULONG_MAX)
250 return -1;
251 out_size = (uLongf)olen;
252
253 if (uncompress(out, &out_size, in, ilen) != Z_OK)
254 return -1;
255
256 if (out_size > OSSL_SSIZE_MAX)
257 return -1;
258 return (ossl_ssize_t)out_size;
259 }
260
261 static COMP_METHOD zlib_oneshot_method = {
262 NID_zlib_compression,
263 LN_zlib_compression,
264 zlib_oneshot_init,
265 zlib_oneshot_finish,
266 zlib_oneshot_compress_block,
267 zlib_oneshot_expand_block
268 };
269
270 static CRYPTO_ONCE zlib_once = CRYPTO_ONCE_STATIC_INIT;
DEFINE_RUN_ONCE_STATIC(ossl_comp_zlib_init)271 DEFINE_RUN_ONCE_STATIC(ossl_comp_zlib_init)
272 {
273 # ifdef ZLIB_SHARED
274 /* LIBZ may be externally defined, and we should respect that value */
275 # ifndef LIBZ
276 # if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
277 # define LIBZ "ZLIB1"
278 # elif defined(OPENSSL_SYS_VMS)
279 # define LIBZ "LIBZ"
280 # else
281 # define LIBZ "z"
282 # endif
283 # endif
284
285 zlib_dso = DSO_load(NULL, LIBZ, NULL, 0);
286 if (zlib_dso != NULL) {
287 p_compress = (compress_ft) DSO_bind_func(zlib_dso, "compress");
288 p_uncompress = (compress_ft) DSO_bind_func(zlib_dso, "uncompress");
289 p_inflateEnd = (inflateEnd_ft) DSO_bind_func(zlib_dso, "inflateEnd");
290 p_inflate = (inflate_ft) DSO_bind_func(zlib_dso, "inflate");
291 p_inflateInit_ = (inflateInit__ft) DSO_bind_func(zlib_dso, "inflateInit_");
292 p_deflateEnd = (deflateEnd_ft) DSO_bind_func(zlib_dso, "deflateEnd");
293 p_deflate = (deflate_ft) DSO_bind_func(zlib_dso, "deflate");
294 p_deflateInit_ = (deflateInit__ft) DSO_bind_func(zlib_dso, "deflateInit_");
295 p_zError = (zError__ft) DSO_bind_func(zlib_dso, "zError");
296
297 if (p_compress == NULL || p_uncompress == NULL || p_inflateEnd == NULL
298 || p_inflate == NULL || p_inflateInit_ == NULL
299 || p_deflateEnd == NULL || p_deflate == NULL
300 || p_deflateInit_ == NULL || p_zError == NULL) {
301 ossl_comp_zlib_cleanup();
302 return 0;
303 }
304 }
305 # endif
306 return 1;
307 }
308 #endif
309
COMP_zlib(void)310 COMP_METHOD *COMP_zlib(void)
311 {
312 COMP_METHOD *meth = NULL;
313
314 #ifndef OPENSSL_NO_ZLIB
315 if (RUN_ONCE(&zlib_once, ossl_comp_zlib_init))
316 meth = &zlib_stateful_method;
317 #endif
318
319 return meth;
320 }
321
COMP_zlib_oneshot(void)322 COMP_METHOD *COMP_zlib_oneshot(void)
323 {
324 COMP_METHOD *meth = NULL;
325
326 #ifndef OPENSSL_NO_ZLIB
327 if (RUN_ONCE(&zlib_once, ossl_comp_zlib_init))
328 meth = &zlib_oneshot_method;
329 #endif
330
331 return meth;
332 }
333
334 /* Also called from OPENSSL_cleanup() */
ossl_comp_zlib_cleanup(void)335 void ossl_comp_zlib_cleanup(void)
336 {
337 #ifdef ZLIB_SHARED
338 DSO_free(zlib_dso);
339 zlib_dso = NULL;
340 #endif
341 }
342
343 #ifndef OPENSSL_NO_ZLIB
344
345 /* Zlib based compression/decompression filter BIO */
346
347 typedef struct {
348 unsigned char *ibuf; /* Input buffer */
349 int ibufsize; /* Buffer size */
350 z_stream zin; /* Input decompress context */
351 unsigned char *obuf; /* Output buffer */
352 int obufsize; /* Output buffer size */
353 unsigned char *optr; /* Position in output buffer */
354 int ocount; /* Amount of data in output buffer */
355 int odone; /* deflate EOF */
356 int comp_level; /* Compression level to use */
357 z_stream zout; /* Output compression context */
358 } BIO_ZLIB_CTX;
359
360 # define ZLIB_DEFAULT_BUFSIZE 1024
361
362 static int bio_zlib_new(BIO *bi);
363 static int bio_zlib_free(BIO *bi);
364 static int bio_zlib_read(BIO *b, char *out, int outl);
365 static int bio_zlib_write(BIO *b, const char *in, int inl);
366 static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr);
367 static long bio_zlib_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp);
368
369 static const BIO_METHOD bio_meth_zlib = {
370 BIO_TYPE_COMP,
371 "zlib",
372 bwrite_conv,
373 bio_zlib_write,
374 bread_conv,
375 bio_zlib_read,
376 NULL, /* bio_zlib_puts, */
377 NULL, /* bio_zlib_gets, */
378 bio_zlib_ctrl,
379 bio_zlib_new,
380 bio_zlib_free,
381 bio_zlib_callback_ctrl
382 };
383 #endif
384
BIO_f_zlib(void)385 const BIO_METHOD *BIO_f_zlib(void)
386 {
387 #ifndef OPENSSL_NO_ZLIB
388 if (RUN_ONCE(&zlib_once, ossl_comp_zlib_init))
389 return &bio_meth_zlib;
390 #endif
391 return NULL;
392 }
393
394 #ifndef OPENSSL_NO_ZLIB
bio_zlib_new(BIO * bi)395 static int bio_zlib_new(BIO *bi)
396 {
397 BIO_ZLIB_CTX *ctx;
398
399 # ifdef ZLIB_SHARED
400 if (!RUN_ONCE(&zlib_once, ossl_comp_zlib_init)) {
401 ERR_raise(ERR_LIB_COMP, COMP_R_ZLIB_NOT_SUPPORTED);
402 return 0;
403 }
404 # endif
405 ctx = OPENSSL_zalloc(sizeof(*ctx));
406 if (ctx == NULL)
407 return 0;
408 ctx->ibufsize = ZLIB_DEFAULT_BUFSIZE;
409 ctx->obufsize = ZLIB_DEFAULT_BUFSIZE;
410 ctx->zin.zalloc = Z_NULL;
411 ctx->zin.zfree = Z_NULL;
412 ctx->zout.zalloc = Z_NULL;
413 ctx->zout.zfree = Z_NULL;
414 ctx->comp_level = Z_DEFAULT_COMPRESSION;
415 BIO_set_init(bi, 1);
416 BIO_set_data(bi, ctx);
417
418 return 1;
419 }
420
bio_zlib_free(BIO * bi)421 static int bio_zlib_free(BIO *bi)
422 {
423 BIO_ZLIB_CTX *ctx;
424
425 if (!bi)
426 return 0;
427 ctx = BIO_get_data(bi);
428 if (ctx->ibuf) {
429 /* Destroy decompress context */
430 inflateEnd(&ctx->zin);
431 OPENSSL_free(ctx->ibuf);
432 }
433 if (ctx->obuf) {
434 /* Destroy compress context */
435 deflateEnd(&ctx->zout);
436 OPENSSL_free(ctx->obuf);
437 }
438 OPENSSL_free(ctx);
439 BIO_set_data(bi, NULL);
440 BIO_set_init(bi, 0);
441
442 return 1;
443 }
444
bio_zlib_read(BIO * b,char * out,int outl)445 static int bio_zlib_read(BIO *b, char *out, int outl)
446 {
447 BIO_ZLIB_CTX *ctx;
448 int ret;
449 z_stream *zin;
450 BIO *next = BIO_next(b);
451
452 if (!out || !outl)
453 return 0;
454 ctx = BIO_get_data(b);
455 zin = &ctx->zin;
456 BIO_clear_retry_flags(b);
457 if (!ctx->ibuf) {
458 ctx->ibuf = OPENSSL_malloc(ctx->ibufsize);
459 if (ctx->ibuf == NULL)
460 return 0;
461 if ((ret = inflateInit(zin)) != Z_OK) {
462 ERR_raise_data(ERR_LIB_COMP, COMP_R_ZLIB_INFLATE_ERROR,
463 "zlib error: %s", zError(ret));
464 return 0;
465 }
466 zin->next_in = ctx->ibuf;
467 zin->avail_in = 0;
468 }
469
470 /* Copy output data directly to supplied buffer */
471 zin->next_out = (unsigned char *)out;
472 zin->avail_out = (unsigned int)outl;
473 for (;;) {
474 /* Decompress while data available */
475 while (zin->avail_in) {
476 ret = inflate(zin, 0);
477 if ((ret != Z_OK) && (ret != Z_STREAM_END)) {
478 ERR_raise_data(ERR_LIB_COMP, COMP_R_ZLIB_INFLATE_ERROR,
479 "zlib error: %s", zError(ret));
480 return 0;
481 }
482 /* If EOF or we've read everything then return */
483 if ((ret == Z_STREAM_END) || !zin->avail_out)
484 return outl - zin->avail_out;
485 }
486
487 /*
488 * No data in input buffer try to read some in, if an error then
489 * return the total data read.
490 */
491 ret = BIO_read(next, ctx->ibuf, ctx->ibufsize);
492 if (ret <= 0) {
493 /* Total data read */
494 int tot = outl - zin->avail_out;
495 BIO_copy_next_retry(b);
496 if (ret < 0)
497 return (tot > 0) ? tot : ret;
498 return tot;
499 }
500 zin->avail_in = ret;
501 zin->next_in = ctx->ibuf;
502 }
503 }
504
bio_zlib_write(BIO * b,const char * in,int inl)505 static int bio_zlib_write(BIO *b, const char *in, int inl)
506 {
507 BIO_ZLIB_CTX *ctx;
508 int ret;
509 z_stream *zout;
510 BIO *next = BIO_next(b);
511
512 if (!in || !inl)
513 return 0;
514 ctx = BIO_get_data(b);
515 if (ctx->odone)
516 return 0;
517 zout = &ctx->zout;
518 BIO_clear_retry_flags(b);
519 if (!ctx->obuf) {
520 ctx->obuf = OPENSSL_malloc(ctx->obufsize);
521 /* Need error here */
522 if (ctx->obuf == NULL)
523 return 0;
524 ctx->optr = ctx->obuf;
525 ctx->ocount = 0;
526 if ((ret = deflateInit(zout, ctx->comp_level)) != Z_OK) {
527 ERR_raise_data(ERR_LIB_COMP, COMP_R_ZLIB_DEFLATE_ERROR,
528 "zlib error: %s", zError(ret));
529 return 0;
530 }
531 zout->next_out = ctx->obuf;
532 zout->avail_out = ctx->obufsize;
533 }
534 /* Obtain input data directly from supplied buffer */
535 zout->next_in = (void *)in;
536 zout->avail_in = inl;
537 for (;;) {
538 /* If data in output buffer write it first */
539 while (ctx->ocount) {
540 ret = BIO_write(next, ctx->optr, ctx->ocount);
541 if (ret <= 0) {
542 /* Total data written */
543 int tot = inl - zout->avail_in;
544 BIO_copy_next_retry(b);
545 if (ret < 0)
546 return (tot > 0) ? tot : ret;
547 return tot;
548 }
549 ctx->optr += ret;
550 ctx->ocount -= ret;
551 }
552
553 /* Have we consumed all supplied data? */
554 if (!zout->avail_in)
555 return inl;
556
557 /* Compress some more */
558
559 /* Reset buffer */
560 ctx->optr = ctx->obuf;
561 zout->next_out = ctx->obuf;
562 zout->avail_out = ctx->obufsize;
563 /* Compress some more */
564 ret = deflate(zout, 0);
565 if (ret != Z_OK) {
566 ERR_raise_data(ERR_LIB_COMP, COMP_R_ZLIB_DEFLATE_ERROR,
567 "zlib error: %s", zError(ret));
568 return 0;
569 }
570 ctx->ocount = ctx->obufsize - zout->avail_out;
571 }
572 }
573
bio_zlib_flush(BIO * b)574 static int bio_zlib_flush(BIO *b)
575 {
576 BIO_ZLIB_CTX *ctx;
577 int ret;
578 z_stream *zout;
579 BIO *next = BIO_next(b);
580
581 ctx = BIO_get_data(b);
582 /* If no data written or already flush show success */
583 if (!ctx->obuf || (ctx->odone && !ctx->ocount))
584 return 1;
585 zout = &ctx->zout;
586 BIO_clear_retry_flags(b);
587 /* No more input data */
588 zout->next_in = NULL;
589 zout->avail_in = 0;
590 for (;;) {
591 /* If data in output buffer write it first */
592 while (ctx->ocount) {
593 ret = BIO_write(next, ctx->optr, ctx->ocount);
594 if (ret <= 0) {
595 BIO_copy_next_retry(b);
596 return ret;
597 }
598 ctx->optr += ret;
599 ctx->ocount -= ret;
600 }
601 if (ctx->odone)
602 return 1;
603
604 /* Compress some more */
605
606 /* Reset buffer */
607 ctx->optr = ctx->obuf;
608 zout->next_out = ctx->obuf;
609 zout->avail_out = ctx->obufsize;
610 /* Compress some more */
611 ret = deflate(zout, Z_FINISH);
612 if (ret == Z_STREAM_END)
613 ctx->odone = 1;
614 else if (ret != Z_OK) {
615 ERR_raise_data(ERR_LIB_COMP, COMP_R_ZLIB_DEFLATE_ERROR,
616 "zlib error: %s", zError(ret));
617 return 0;
618 }
619 ctx->ocount = ctx->obufsize - zout->avail_out;
620 }
621 }
622
bio_zlib_ctrl(BIO * b,int cmd,long num,void * ptr)623 static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr)
624 {
625 BIO_ZLIB_CTX *ctx;
626 int ret, *ip;
627 int ibs, obs;
628 BIO *next = BIO_next(b);
629
630 if (next == NULL)
631 return 0;
632 ctx = BIO_get_data(b);
633 switch (cmd) {
634
635 case BIO_CTRL_RESET:
636 ctx->ocount = 0;
637 ctx->odone = 0;
638 ret = 1;
639 break;
640
641 case BIO_CTRL_FLUSH:
642 ret = bio_zlib_flush(b);
643 if (ret > 0) {
644 ret = BIO_flush(next);
645 BIO_copy_next_retry(b);
646 }
647 break;
648
649 case BIO_C_SET_BUFF_SIZE:
650 ibs = -1;
651 obs = -1;
652 if (ptr != NULL) {
653 ip = ptr;
654 if (*ip == 0)
655 ibs = (int)num;
656 else
657 obs = (int)num;
658 } else {
659 ibs = (int)num;
660 obs = ibs;
661 }
662
663 if (ibs != -1) {
664 OPENSSL_free(ctx->ibuf);
665 ctx->ibuf = NULL;
666 ctx->ibufsize = ibs;
667 }
668
669 if (obs != -1) {
670 OPENSSL_free(ctx->obuf);
671 ctx->obuf = NULL;
672 ctx->obufsize = obs;
673 }
674 ret = 1;
675 break;
676
677 case BIO_C_DO_STATE_MACHINE:
678 BIO_clear_retry_flags(b);
679 ret = BIO_ctrl(next, cmd, num, ptr);
680 BIO_copy_next_retry(b);
681 break;
682
683 case BIO_CTRL_WPENDING:
684 if (ctx->obuf == NULL)
685 return 0;
686
687 if (ctx->odone) {
688 ret = ctx->ocount;
689 } else {
690 ret = ctx->ocount;
691 if (ret == 0)
692 /* Unknown amount pending but we are not finished */
693 ret = 1;
694 }
695 if (ret == 0)
696 ret = BIO_ctrl(next, cmd, num, ptr);
697 break;
698
699 case BIO_CTRL_PENDING:
700 ret = ctx->zin.avail_in;
701 if (ret == 0)
702 ret = BIO_ctrl(next, cmd, num, ptr);
703 break;
704
705 default:
706 ret = BIO_ctrl(next, cmd, num, ptr);
707 break;
708
709 }
710
711 return ret;
712 }
713
bio_zlib_callback_ctrl(BIO * b,int cmd,BIO_info_cb * fp)714 static long bio_zlib_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
715 {
716 BIO *next = BIO_next(b);
717
718 if (next == NULL)
719 return 0;
720 return BIO_callback_ctrl(next, cmd, fp);
721 }
722
723 #endif
724
