1 | /* |
2 | * Copyright 1998-2016 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 "comp_local.h" |
19 | |
20 | COMP_METHOD *COMP_zlib(void); |
21 | |
22 | static COMP_METHOD zlib_method_nozlib = { |
23 | NID_undef, |
24 | "(undef)" , |
25 | NULL, |
26 | NULL, |
27 | NULL, |
28 | NULL, |
29 | }; |
30 | |
31 | #ifndef ZLIB |
32 | # undef ZLIB_SHARED |
33 | #else |
34 | |
35 | # include <zlib.h> |
36 | |
37 | static int zlib_stateful_init(COMP_CTX *ctx); |
38 | static void zlib_stateful_finish(COMP_CTX *ctx); |
39 | static int zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out, |
40 | unsigned int olen, unsigned char *in, |
41 | unsigned int ilen); |
42 | static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out, |
43 | unsigned int olen, unsigned char *in, |
44 | unsigned int ilen); |
45 | |
46 | /* memory allocations functions for zlib initialisation */ |
47 | static void *zlib_zalloc(void *opaque, unsigned int no, unsigned int size) |
48 | { |
49 | void *p; |
50 | |
51 | p = OPENSSL_zalloc(no * size); |
52 | return p; |
53 | } |
54 | |
55 | static void zlib_zfree(void *opaque, void *address) |
56 | { |
57 | OPENSSL_free(address); |
58 | } |
59 | |
60 | |
61 | static COMP_METHOD zlib_stateful_method = { |
62 | NID_zlib_compression, |
63 | LN_zlib_compression, |
64 | zlib_stateful_init, |
65 | zlib_stateful_finish, |
66 | zlib_stateful_compress_block, |
67 | zlib_stateful_expand_block |
68 | }; |
69 | |
70 | /* |
71 | * When OpenSSL is built on Windows, we do not want to require that |
72 | * the ZLIB.DLL be available in order for the OpenSSL DLLs to |
73 | * work. Therefore, all ZLIB routines are loaded at run time |
74 | * and we do not link to a .LIB file when ZLIB_SHARED is set. |
75 | */ |
76 | # if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32) |
77 | # include <windows.h> |
78 | # endif /* !(OPENSSL_SYS_WINDOWS || |
79 | * OPENSSL_SYS_WIN32) */ |
80 | |
81 | # ifdef ZLIB_SHARED |
82 | # include "internal/dso.h" |
83 | |
84 | /* Function pointers */ |
85 | typedef int (*compress_ft) (Bytef *dest, uLongf * destLen, |
86 | const Bytef *source, uLong sourceLen); |
87 | typedef int (*inflateEnd_ft) (z_streamp strm); |
88 | typedef int (*inflate_ft) (z_streamp strm, int flush); |
89 | typedef int (*inflateInit__ft) (z_streamp strm, |
90 | const char *version, int stream_size); |
91 | typedef int (*deflateEnd_ft) (z_streamp strm); |
92 | typedef int (*deflate_ft) (z_streamp strm, int flush); |
93 | typedef int (*deflateInit__ft) (z_streamp strm, int level, |
94 | const char *version, int stream_size); |
95 | typedef const char *(*zError__ft) (int err); |
96 | static compress_ft p_compress = NULL; |
97 | static inflateEnd_ft p_inflateEnd = NULL; |
98 | static inflate_ft p_inflate = NULL; |
99 | static inflateInit__ft p_inflateInit_ = NULL; |
100 | static deflateEnd_ft p_deflateEnd = NULL; |
101 | static deflate_ft p_deflate = NULL; |
102 | static deflateInit__ft p_deflateInit_ = NULL; |
103 | static zError__ft p_zError = NULL; |
104 | |
105 | static int zlib_loaded = 0; /* only attempt to init func pts once */ |
106 | static DSO *zlib_dso = NULL; |
107 | |
108 | # define compress p_compress |
109 | # define inflateEnd p_inflateEnd |
110 | # define inflate p_inflate |
111 | # define inflateInit_ p_inflateInit_ |
112 | # define deflateEnd p_deflateEnd |
113 | # define deflate p_deflate |
114 | # define deflateInit_ p_deflateInit_ |
115 | # define zError p_zError |
116 | # endif /* ZLIB_SHARED */ |
117 | |
118 | struct zlib_state { |
119 | z_stream istream; |
120 | z_stream ostream; |
121 | }; |
122 | |
123 | static int zlib_stateful_init(COMP_CTX *ctx) |
124 | { |
125 | int err; |
126 | struct zlib_state *state = OPENSSL_zalloc(sizeof(*state)); |
127 | |
128 | if (state == NULL) |
129 | goto err; |
130 | |
131 | state->istream.zalloc = zlib_zalloc; |
132 | state->istream.zfree = zlib_zfree; |
133 | state->istream.opaque = Z_NULL; |
134 | state->istream.next_in = Z_NULL; |
135 | state->istream.next_out = Z_NULL; |
136 | err = inflateInit_(&state->istream, ZLIB_VERSION, sizeof(z_stream)); |
137 | if (err != Z_OK) |
138 | goto err; |
139 | |
140 | state->ostream.zalloc = zlib_zalloc; |
141 | state->ostream.zfree = zlib_zfree; |
142 | state->ostream.opaque = Z_NULL; |
143 | state->ostream.next_in = Z_NULL; |
144 | state->ostream.next_out = Z_NULL; |
145 | err = deflateInit_(&state->ostream, Z_DEFAULT_COMPRESSION, |
146 | ZLIB_VERSION, sizeof(z_stream)); |
147 | if (err != Z_OK) |
148 | goto err; |
149 | |
150 | ctx->data = state; |
151 | return 1; |
152 | err: |
153 | OPENSSL_free(state); |
154 | return 0; |
155 | } |
156 | |
157 | static void zlib_stateful_finish(COMP_CTX *ctx) |
158 | { |
159 | struct zlib_state *state = ctx->data; |
160 | inflateEnd(&state->istream); |
161 | deflateEnd(&state->ostream); |
162 | OPENSSL_free(state); |
163 | } |
164 | |
165 | static int zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out, |
166 | unsigned int olen, unsigned char *in, |
167 | unsigned int ilen) |
168 | { |
169 | int err = Z_OK; |
170 | struct zlib_state *state = ctx->data; |
171 | |
172 | if (state == NULL) |
173 | return -1; |
174 | |
175 | state->ostream.next_in = in; |
176 | state->ostream.avail_in = ilen; |
177 | state->ostream.next_out = out; |
178 | state->ostream.avail_out = olen; |
179 | if (ilen > 0) |
180 | err = deflate(&state->ostream, Z_SYNC_FLUSH); |
181 | if (err != Z_OK) |
182 | return -1; |
183 | return olen - state->ostream.avail_out; |
184 | } |
185 | |
186 | static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out, |
187 | unsigned int olen, unsigned char *in, |
188 | unsigned int ilen) |
189 | { |
190 | int err = Z_OK; |
191 | struct zlib_state *state = ctx->data; |
192 | |
193 | if (state == NULL) |
194 | return 0; |
195 | |
196 | state->istream.next_in = in; |
197 | state->istream.avail_in = ilen; |
198 | state->istream.next_out = out; |
199 | state->istream.avail_out = olen; |
200 | if (ilen > 0) |
201 | err = inflate(&state->istream, Z_SYNC_FLUSH); |
202 | if (err != Z_OK) |
203 | return -1; |
204 | return olen - state->istream.avail_out; |
205 | } |
206 | |
207 | #endif |
208 | |
209 | COMP_METHOD *COMP_zlib(void) |
210 | { |
211 | COMP_METHOD *meth = &zlib_method_nozlib; |
212 | |
213 | #ifdef ZLIB_SHARED |
214 | /* LIBZ may be externally defined, and we should respect that value */ |
215 | # ifndef LIBZ |
216 | # if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32) |
217 | # define LIBZ "ZLIB1" |
218 | # elif defined(OPENSSL_SYS_VMS) |
219 | # define LIBZ "LIBZ" |
220 | # else |
221 | # define LIBZ "z" |
222 | # endif |
223 | # endif |
224 | |
225 | if (!zlib_loaded) { |
226 | zlib_dso = DSO_load(NULL, LIBZ, NULL, 0); |
227 | if (zlib_dso != NULL) { |
228 | p_compress = (compress_ft) DSO_bind_func(zlib_dso, "compress" ); |
229 | p_inflateEnd |
230 | = (inflateEnd_ft) DSO_bind_func(zlib_dso, "inflateEnd" ); |
231 | p_inflate = (inflate_ft) DSO_bind_func(zlib_dso, "inflate" ); |
232 | p_inflateInit_ |
233 | = (inflateInit__ft) DSO_bind_func(zlib_dso, "inflateInit_" ); |
234 | p_deflateEnd |
235 | = (deflateEnd_ft) DSO_bind_func(zlib_dso, "deflateEnd" ); |
236 | p_deflate = (deflate_ft) DSO_bind_func(zlib_dso, "deflate" ); |
237 | p_deflateInit_ |
238 | = (deflateInit__ft) DSO_bind_func(zlib_dso, "deflateInit_" ); |
239 | p_zError = (zError__ft) DSO_bind_func(zlib_dso, "zError" ); |
240 | |
241 | if (p_compress && p_inflateEnd && p_inflate |
242 | && p_inflateInit_ && p_deflateEnd |
243 | && p_deflate && p_deflateInit_ && p_zError) |
244 | zlib_loaded++; |
245 | |
246 | if (!OPENSSL_init_crypto(OPENSSL_INIT_ZLIB, NULL)) { |
247 | comp_zlib_cleanup_int(); |
248 | return meth; |
249 | } |
250 | if (zlib_loaded) |
251 | meth = &zlib_stateful_method; |
252 | } |
253 | } |
254 | #endif |
255 | #if defined(ZLIB) |
256 | meth = &zlib_stateful_method; |
257 | #endif |
258 | |
259 | return meth; |
260 | } |
261 | |
262 | void comp_zlib_cleanup_int(void) |
263 | { |
264 | #ifdef ZLIB_SHARED |
265 | DSO_free(zlib_dso); |
266 | zlib_dso = NULL; |
267 | #endif |
268 | } |
269 | |
270 | #ifdef ZLIB |
271 | |
272 | /* Zlib based compression/decompression filter BIO */ |
273 | |
274 | typedef struct { |
275 | unsigned char *ibuf; /* Input buffer */ |
276 | int ibufsize; /* Buffer size */ |
277 | z_stream zin; /* Input decompress context */ |
278 | unsigned char *obuf; /* Output buffer */ |
279 | int obufsize; /* Output buffer size */ |
280 | unsigned char *optr; /* Position in output buffer */ |
281 | int ocount; /* Amount of data in output buffer */ |
282 | int odone; /* deflate EOF */ |
283 | int comp_level; /* Compression level to use */ |
284 | z_stream zout; /* Output compression context */ |
285 | } BIO_ZLIB_CTX; |
286 | |
287 | # define ZLIB_DEFAULT_BUFSIZE 1024 |
288 | |
289 | static int bio_zlib_new(BIO *bi); |
290 | static int bio_zlib_free(BIO *bi); |
291 | static int bio_zlib_read(BIO *b, char *out, int outl); |
292 | static int bio_zlib_write(BIO *b, const char *in, int inl); |
293 | static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr); |
294 | static long bio_zlib_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp); |
295 | |
296 | static const BIO_METHOD bio_meth_zlib = { |
297 | BIO_TYPE_COMP, |
298 | "zlib" , |
299 | /* TODO: Convert to new style write function */ |
300 | bwrite_conv, |
301 | bio_zlib_write, |
302 | /* TODO: Convert to new style read function */ |
303 | bread_conv, |
304 | bio_zlib_read, |
305 | NULL, /* bio_zlib_puts, */ |
306 | NULL, /* bio_zlib_gets, */ |
307 | bio_zlib_ctrl, |
308 | bio_zlib_new, |
309 | bio_zlib_free, |
310 | bio_zlib_callback_ctrl |
311 | }; |
312 | |
313 | const BIO_METHOD *BIO_f_zlib(void) |
314 | { |
315 | return &bio_meth_zlib; |
316 | } |
317 | |
318 | static int bio_zlib_new(BIO *bi) |
319 | { |
320 | BIO_ZLIB_CTX *ctx; |
321 | # ifdef ZLIB_SHARED |
322 | (void)COMP_zlib(); |
323 | if (!zlib_loaded) { |
324 | COMPerr(COMP_F_BIO_ZLIB_NEW, COMP_R_ZLIB_NOT_SUPPORTED); |
325 | return 0; |
326 | } |
327 | # endif |
328 | ctx = OPENSSL_zalloc(sizeof(*ctx)); |
329 | if (ctx == NULL) { |
330 | COMPerr(COMP_F_BIO_ZLIB_NEW, ERR_R_MALLOC_FAILURE); |
331 | return 0; |
332 | } |
333 | ctx->ibufsize = ZLIB_DEFAULT_BUFSIZE; |
334 | ctx->obufsize = ZLIB_DEFAULT_BUFSIZE; |
335 | ctx->zin.zalloc = Z_NULL; |
336 | ctx->zin.zfree = Z_NULL; |
337 | ctx->zout.zalloc = Z_NULL; |
338 | ctx->zout.zfree = Z_NULL; |
339 | ctx->comp_level = Z_DEFAULT_COMPRESSION; |
340 | BIO_set_init(bi, 1); |
341 | BIO_set_data(bi, ctx); |
342 | |
343 | return 1; |
344 | } |
345 | |
346 | static int bio_zlib_free(BIO *bi) |
347 | { |
348 | BIO_ZLIB_CTX *ctx; |
349 | if (!bi) |
350 | return 0; |
351 | ctx = BIO_get_data(bi); |
352 | if (ctx->ibuf) { |
353 | /* Destroy decompress context */ |
354 | inflateEnd(&ctx->zin); |
355 | OPENSSL_free(ctx->ibuf); |
356 | } |
357 | if (ctx->obuf) { |
358 | /* Destroy compress context */ |
359 | deflateEnd(&ctx->zout); |
360 | OPENSSL_free(ctx->obuf); |
361 | } |
362 | OPENSSL_free(ctx); |
363 | BIO_set_data(bi, NULL); |
364 | BIO_set_init(bi, 0); |
365 | |
366 | return 1; |
367 | } |
368 | |
369 | static int bio_zlib_read(BIO *b, char *out, int outl) |
370 | { |
371 | BIO_ZLIB_CTX *ctx; |
372 | int ret; |
373 | z_stream *zin; |
374 | BIO *next = BIO_next(b); |
375 | |
376 | if (!out || !outl) |
377 | return 0; |
378 | ctx = BIO_get_data(b); |
379 | zin = &ctx->zin; |
380 | BIO_clear_retry_flags(b); |
381 | if (!ctx->ibuf) { |
382 | ctx->ibuf = OPENSSL_malloc(ctx->ibufsize); |
383 | if (ctx->ibuf == NULL) { |
384 | COMPerr(COMP_F_BIO_ZLIB_READ, ERR_R_MALLOC_FAILURE); |
385 | return 0; |
386 | } |
387 | inflateInit(zin); |
388 | zin->next_in = ctx->ibuf; |
389 | zin->avail_in = 0; |
390 | } |
391 | |
392 | /* Copy output data directly to supplied buffer */ |
393 | zin->next_out = (unsigned char *)out; |
394 | zin->avail_out = (unsigned int)outl; |
395 | for (;;) { |
396 | /* Decompress while data available */ |
397 | while (zin->avail_in) { |
398 | ret = inflate(zin, 0); |
399 | if ((ret != Z_OK) && (ret != Z_STREAM_END)) { |
400 | COMPerr(COMP_F_BIO_ZLIB_READ, COMP_R_ZLIB_INFLATE_ERROR); |
401 | ERR_add_error_data(2, "zlib error:" , zError(ret)); |
402 | return 0; |
403 | } |
404 | /* If EOF or we've read everything then return */ |
405 | if ((ret == Z_STREAM_END) || !zin->avail_out) |
406 | return outl - zin->avail_out; |
407 | } |
408 | |
409 | /* |
410 | * No data in input buffer try to read some in, if an error then |
411 | * return the total data read. |
412 | */ |
413 | ret = BIO_read(next, ctx->ibuf, ctx->ibufsize); |
414 | if (ret <= 0) { |
415 | /* Total data read */ |
416 | int tot = outl - zin->avail_out; |
417 | BIO_copy_next_retry(b); |
418 | if (ret < 0) |
419 | return (tot > 0) ? tot : ret; |
420 | return tot; |
421 | } |
422 | zin->avail_in = ret; |
423 | zin->next_in = ctx->ibuf; |
424 | } |
425 | } |
426 | |
427 | static int bio_zlib_write(BIO *b, const char *in, int inl) |
428 | { |
429 | BIO_ZLIB_CTX *ctx; |
430 | int ret; |
431 | z_stream *zout; |
432 | BIO *next = BIO_next(b); |
433 | |
434 | if (!in || !inl) |
435 | return 0; |
436 | ctx = BIO_get_data(b); |
437 | if (ctx->odone) |
438 | return 0; |
439 | zout = &ctx->zout; |
440 | BIO_clear_retry_flags(b); |
441 | if (!ctx->obuf) { |
442 | ctx->obuf = OPENSSL_malloc(ctx->obufsize); |
443 | /* Need error here */ |
444 | if (ctx->obuf == NULL) { |
445 | COMPerr(COMP_F_BIO_ZLIB_WRITE, ERR_R_MALLOC_FAILURE); |
446 | return 0; |
447 | } |
448 | ctx->optr = ctx->obuf; |
449 | ctx->ocount = 0; |
450 | deflateInit(zout, ctx->comp_level); |
451 | zout->next_out = ctx->obuf; |
452 | zout->avail_out = ctx->obufsize; |
453 | } |
454 | /* Obtain input data directly from supplied buffer */ |
455 | zout->next_in = (void *)in; |
456 | zout->avail_in = inl; |
457 | for (;;) { |
458 | /* If data in output buffer write it first */ |
459 | while (ctx->ocount) { |
460 | ret = BIO_write(next, ctx->optr, ctx->ocount); |
461 | if (ret <= 0) { |
462 | /* Total data written */ |
463 | int tot = inl - zout->avail_in; |
464 | BIO_copy_next_retry(b); |
465 | if (ret < 0) |
466 | return (tot > 0) ? tot : ret; |
467 | return tot; |
468 | } |
469 | ctx->optr += ret; |
470 | ctx->ocount -= ret; |
471 | } |
472 | |
473 | /* Have we consumed all supplied data? */ |
474 | if (!zout->avail_in) |
475 | return inl; |
476 | |
477 | /* Compress some more */ |
478 | |
479 | /* Reset buffer */ |
480 | ctx->optr = ctx->obuf; |
481 | zout->next_out = ctx->obuf; |
482 | zout->avail_out = ctx->obufsize; |
483 | /* Compress some more */ |
484 | ret = deflate(zout, 0); |
485 | if (ret != Z_OK) { |
486 | COMPerr(COMP_F_BIO_ZLIB_WRITE, COMP_R_ZLIB_DEFLATE_ERROR); |
487 | ERR_add_error_data(2, "zlib error:" , zError(ret)); |
488 | return 0; |
489 | } |
490 | ctx->ocount = ctx->obufsize - zout->avail_out; |
491 | } |
492 | } |
493 | |
494 | static int bio_zlib_flush(BIO *b) |
495 | { |
496 | BIO_ZLIB_CTX *ctx; |
497 | int ret; |
498 | z_stream *zout; |
499 | BIO *next = BIO_next(b); |
500 | |
501 | ctx = BIO_get_data(b); |
502 | /* If no data written or already flush show success */ |
503 | if (!ctx->obuf || (ctx->odone && !ctx->ocount)) |
504 | return 1; |
505 | zout = &ctx->zout; |
506 | BIO_clear_retry_flags(b); |
507 | /* No more input data */ |
508 | zout->next_in = NULL; |
509 | zout->avail_in = 0; |
510 | for (;;) { |
511 | /* If data in output buffer write it first */ |
512 | while (ctx->ocount) { |
513 | ret = BIO_write(next, ctx->optr, ctx->ocount); |
514 | if (ret <= 0) { |
515 | BIO_copy_next_retry(b); |
516 | return ret; |
517 | } |
518 | ctx->optr += ret; |
519 | ctx->ocount -= ret; |
520 | } |
521 | if (ctx->odone) |
522 | return 1; |
523 | |
524 | /* Compress some more */ |
525 | |
526 | /* Reset buffer */ |
527 | ctx->optr = ctx->obuf; |
528 | zout->next_out = ctx->obuf; |
529 | zout->avail_out = ctx->obufsize; |
530 | /* Compress some more */ |
531 | ret = deflate(zout, Z_FINISH); |
532 | if (ret == Z_STREAM_END) |
533 | ctx->odone = 1; |
534 | else if (ret != Z_OK) { |
535 | COMPerr(COMP_F_BIO_ZLIB_FLUSH, COMP_R_ZLIB_DEFLATE_ERROR); |
536 | ERR_add_error_data(2, "zlib error:" , zError(ret)); |
537 | return 0; |
538 | } |
539 | ctx->ocount = ctx->obufsize - zout->avail_out; |
540 | } |
541 | } |
542 | |
543 | static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr) |
544 | { |
545 | BIO_ZLIB_CTX *ctx; |
546 | int ret, *ip; |
547 | int ibs, obs; |
548 | BIO *next = BIO_next(b); |
549 | |
550 | if (next == NULL) |
551 | return 0; |
552 | ctx = BIO_get_data(b); |
553 | switch (cmd) { |
554 | |
555 | case BIO_CTRL_RESET: |
556 | ctx->ocount = 0; |
557 | ctx->odone = 0; |
558 | ret = 1; |
559 | break; |
560 | |
561 | case BIO_CTRL_FLUSH: |
562 | ret = bio_zlib_flush(b); |
563 | if (ret > 0) |
564 | ret = BIO_flush(next); |
565 | break; |
566 | |
567 | case BIO_C_SET_BUFF_SIZE: |
568 | ibs = -1; |
569 | obs = -1; |
570 | if (ptr != NULL) { |
571 | ip = ptr; |
572 | if (*ip == 0) |
573 | ibs = (int)num; |
574 | else |
575 | obs = (int)num; |
576 | } else { |
577 | ibs = (int)num; |
578 | obs = ibs; |
579 | } |
580 | |
581 | if (ibs != -1) { |
582 | OPENSSL_free(ctx->ibuf); |
583 | ctx->ibuf = NULL; |
584 | ctx->ibufsize = ibs; |
585 | } |
586 | |
587 | if (obs != -1) { |
588 | OPENSSL_free(ctx->obuf); |
589 | ctx->obuf = NULL; |
590 | ctx->obufsize = obs; |
591 | } |
592 | ret = 1; |
593 | break; |
594 | |
595 | case BIO_C_DO_STATE_MACHINE: |
596 | BIO_clear_retry_flags(b); |
597 | ret = BIO_ctrl(next, cmd, num, ptr); |
598 | BIO_copy_next_retry(b); |
599 | break; |
600 | |
601 | case BIO_CTRL_WPENDING: |
602 | if (ctx->obuf == NULL) |
603 | return 0; |
604 | |
605 | if (ctx->odone) { |
606 | ret = ctx->ocount; |
607 | } else { |
608 | ret = ctx->ocount; |
609 | if (ret == 0) |
610 | /* Unknown amount pending but we are not finished */ |
611 | ret = 1; |
612 | } |
613 | if (ret == 0) |
614 | ret = BIO_ctrl(next, cmd, num, ptr); |
615 | break; |
616 | |
617 | case BIO_CTRL_PENDING: |
618 | ret = ctx->zin.avail_in; |
619 | if (ret == 0) |
620 | ret = BIO_ctrl(next, cmd, num, ptr); |
621 | break; |
622 | |
623 | default: |
624 | ret = BIO_ctrl(next, cmd, num, ptr); |
625 | break; |
626 | |
627 | } |
628 | |
629 | return ret; |
630 | } |
631 | |
632 | static long bio_zlib_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp) |
633 | { |
634 | BIO *next = BIO_next(b); |
635 | if (next == NULL) |
636 | return 0; |
637 | return BIO_callback_ctrl(next, cmd, fp); |
638 | } |
639 | |
640 | #endif |
641 | |