crypto/comp/c_zlib.c

   1 /* ====================================================================
   2  * Copyright (c) 1999-2015 The OpenSSL Project.  All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or without
   5  * modification, are permitted provided that the following conditions
   6  * are met:
   7  *
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  *
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in
  13  *    the documentation and/or other materials provided with the
  14  *    distribution.
  15  *
  16  * 3. All advertising materials mentioning features or use of this
  17  *    software must display the following acknowledgment:
  18  *    "This product includes software developed by the OpenSSL Project
  19  *    for use in the OpenSSL Toolkit. (http://www.OpenSSL.org/)"
  20  *
  21  * 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
  22  *    endorse or promote products derived from this software without
  23  *    prior written permission. For written permission, please contact
  24  *    openssl-core@OpenSSL.org.
  25  *
  26  * 5. Products derived from this software may not be called "OpenSSL"
  27  *    nor may "OpenSSL" appear in their names without prior written
  28  *    permission of the OpenSSL Project.
  29  *
  30  * 6. Redistributions of any form whatsoever must retain the following
  31  *    acknowledgment:
  32  *    "This product includes software developed by the OpenSSL Project
  33  *    for use in the OpenSSL Toolkit (http://www.OpenSSL.org/)"
  34  *
  35  * THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
  36  * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  37  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  38  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE OpenSSL PROJECT OR
  39  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  40  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  41  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
  42  * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  43  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
  44  * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  45  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
  46  * OF THE POSSIBILITY OF SUCH DAMAGE.
  47  * ====================================================================
  48  *
  49  * This product includes cryptographic software written by Eric Young
  50  * (eay@cryptsoft.com).  This product includes software written by Tim
  51  * Hudson (tjh@cryptsoft.com).
  52  *
  53  */
  54
  55 #include <stdio.h>
  56 #include <stdlib.h>
  57 #include <string.h>
  58 #include <openssl/objects.h>
  59 #include "internal/comp.h"
  60 #include <openssl/err.h>
  61 #include "internal/cryptlib_int.h"
  62 #include "internal/bio.h"
  63 #include "comp_lcl.h"
  64
  65 COMP_METHOD *COMP_zlib(void);
  66
  67 static COMP_METHOD zlib_method_nozlib = {
  68     NID_undef,
  69     "(undef)",
  70     NULL,
  71     NULL,
  72     NULL,
  73     NULL,
  74 };
  75
  76 #ifndef ZLIB
  77 # undef ZLIB_SHARED
  78 #else
  79
  80 # include <zlib.h>
  81
  82 static int zlib_stateful_init(COMP_CTX *ctx);
  83 static void zlib_stateful_finish(COMP_CTX *ctx);
  84 static int zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out,
  85                                         unsigned int olen, unsigned char *in,
  86                                         unsigned int ilen);
  87 static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
  88                                       unsigned int olen, unsigned char *in,
  89                                       unsigned int ilen);
  90
  91 /* memory allocations functions for zlib initialisation */
  92 static void *zlib_zalloc(void *opaque, unsigned int no, unsigned int size)
  93 {
  94     void *p;
  95
  96     p = OPENSSL_zalloc(no * size);
  97     return p;
  98 }
  99
 100 static void zlib_zfree(void *opaque, void *address)
 101 {
 102     OPENSSL_free(address);
 103 }
 104
 105
 106 static COMP_METHOD zlib_stateful_method = {
 107     NID_zlib_compression,
 108     LN_zlib_compression,
 109     zlib_stateful_init,
 110     zlib_stateful_finish,
 111     zlib_stateful_compress_block,
 112     zlib_stateful_expand_block
 113 };
 114
 115 /*
 116  * When OpenSSL is built on Windows, we do not want to require that
 117  * the ZLIB.DLL be available in order for the OpenSSL DLLs to
 118  * work.  Therefore, all ZLIB routines are loaded at run time
 119  * and we do not link to a .LIB file when ZLIB_SHARED is set.
 120  */
 121 # if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
 122 #  include <windows.h>
 123 # endif                         /* !(OPENSSL_SYS_WINDOWS ||
 124                                  * OPENSSL_SYS_WIN32) */
 125
 126 # ifdef ZLIB_SHARED
 127 #  include "internal/dso.h"
 128
 129 /* Function pointers */
 130 typedef int (*compress_ft) (Bytef *dest, uLongf * destLen,
 131                             const Bytef *source, uLong sourceLen);
 132 typedef int (*inflateEnd_ft) (z_streamp strm);
 133 typedef int (*inflate_ft) (z_streamp strm, int flush);
 134 typedef int (*inflateInit__ft) (z_streamp strm,
 135                                 const char *version, int stream_size);
 136 typedef int (*deflateEnd_ft) (z_streamp strm);
 137 typedef int (*deflate_ft) (z_streamp strm, int flush);
 138 typedef int (*deflateInit__ft) (z_streamp strm, int level,
 139                                 const char *version, int stream_size);
 140 typedef const char *(*zError__ft) (int err);
 141 static compress_ft p_compress = NULL;
 142 static inflateEnd_ft p_inflateEnd = NULL;
 143 static inflate_ft p_inflate = NULL;
 144 static inflateInit__ft p_inflateInit_ = NULL;
 145 static deflateEnd_ft p_deflateEnd = NULL;
 146 static deflate_ft p_deflate = NULL;
 147 static deflateInit__ft p_deflateInit_ = NULL;
 148 static zError__ft p_zError = NULL;
 149
 150 static int zlib_loaded = 0;     /* only attempt to init func pts once */
 151 static DSO *zlib_dso = NULL;
 152
 153 #  define compress                p_compress
 154 #  define inflateEnd              p_inflateEnd
 155 #  define inflate                 p_inflate
 156 #  define inflateInit_            p_inflateInit_
 157 #  define deflateEnd              p_deflateEnd
 158 #  define deflate                 p_deflate
 159 #  define deflateInit_            p_deflateInit_
 160 #  define zError                  p_zError
 161 # endif                         /* ZLIB_SHARED */
 162
 163 struct zlib_state {
 164     z_stream istream;
 165     z_stream ostream;
 166 };
 167
 168 static int zlib_stateful_init(COMP_CTX *ctx)
 169 {
 170     int err;
 171     struct zlib_state *state = OPENSSL_zalloc(sizeof(*state));
 172
 173     if (state == NULL)
 174         goto err;
 175
 176     state->istream.zalloc = zlib_zalloc;
 177     state->istream.zfree = zlib_zfree;
 178     state->istream.opaque = Z_NULL;
 179     state->istream.next_in = Z_NULL;
 180     state->istream.next_out = Z_NULL;
 181     err = inflateInit_(&state->istream, ZLIB_VERSION, sizeof(z_stream));
 182     if (err != Z_OK)
 183         goto err;
 184
 185     state->ostream.zalloc = zlib_zalloc;
 186     state->ostream.zfree = zlib_zfree;
 187     state->ostream.opaque = Z_NULL;
 188     state->ostream.next_in = Z_NULL;
 189     state->ostream.next_out = Z_NULL;
 190     err = deflateInit_(&state->ostream, Z_DEFAULT_COMPRESSION,
 191                        ZLIB_VERSION, sizeof(z_stream));
 192     if (err != Z_OK)
 193         goto err;
 194
 195     ctx->data = state;
 196     return 1;
 197  err:
 198     OPENSSL_free(state);
 199     return 0;
 200 }
 201
 202 static void zlib_stateful_finish(COMP_CTX *ctx)
 203 {
 204     struct zlib_state *state = ctx->data;
 205     inflateEnd(&state->istream);
 206     deflateEnd(&state->ostream);
 207     OPENSSL_free(state);
 208 }
 209
 210 static int zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out,
 211                                         unsigned int olen, unsigned char *in,
 212                                         unsigned int ilen)
 213 {
 214     int err = Z_OK;
 215     struct zlib_state *state = ctx->data;
 216
 217     if (state == NULL)
 218         return -1;
 219
 220     state->ostream.next_in = in;
 221     state->ostream.avail_in = ilen;
 222     state->ostream.next_out = out;
 223     state->ostream.avail_out = olen;
 224     if (ilen > 0)
 225         err = deflate(&state->ostream, Z_SYNC_FLUSH);
 226     if (err != Z_OK)
 227         return -1;
 228     return olen - state->ostream.avail_out;
 229 }
 230
 231 static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
 232                                       unsigned int olen, unsigned char *in,
 233                                       unsigned int ilen)
 234 {
 235     int err = Z_OK;
 236     struct zlib_state *state = ctx->data;
 237
 238     if (state == NULL)
 239         return 0;
 240
 241     state->istream.next_in = in;
 242     state->istream.avail_in = ilen;
 243     state->istream.next_out = out;
 244     state->istream.avail_out = olen;
 245     if (ilen > 0)
 246         err = inflate(&state->istream, Z_SYNC_FLUSH);
 247     if (err != Z_OK)
 248         return -1;
 249     return olen - state->istream.avail_out;
 250 }
 251
 252 #endif
 253
 254 COMP_METHOD *COMP_zlib(void)
 255 {
 256     COMP_METHOD *meth = &zlib_method_nozlib;
 257
 258 #ifdef ZLIB_SHARED
 259     if (!zlib_loaded) {
 260 # if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
 261         zlib_dso = DSO_load(NULL, "ZLIB1", NULL, 0);
 262 # else
 263         zlib_dso = DSO_load(NULL, "z", NULL, 0);
 264 # endif
 265         if (zlib_dso != NULL) {
 266             p_compress = (compress_ft) DSO_bind_func(zlib_dso, "compress");
 267             p_inflateEnd
 268                 = (inflateEnd_ft) DSO_bind_func(zlib_dso, "inflateEnd");
 269             p_inflate = (inflate_ft) DSO_bind_func(zlib_dso, "inflate");
 270             p_inflateInit_
 271                 = (inflateInit__ft) DSO_bind_func(zlib_dso, "inflateInit_");
 272             p_deflateEnd
 273                 = (deflateEnd_ft) DSO_bind_func(zlib_dso, "deflateEnd");
 274             p_deflate = (deflate_ft) DSO_bind_func(zlib_dso, "deflate");
 275             p_deflateInit_
 276                 = (deflateInit__ft) DSO_bind_func(zlib_dso, "deflateInit_");
 277             p_zError = (zError__ft) DSO_bind_func(zlib_dso, "zError");
 278
 279             if (p_compress && p_inflateEnd && p_inflate
 280                 && p_inflateInit_ && p_deflateEnd
 281                 && p_deflate && p_deflateInit_ && p_zError)
 282                 zlib_loaded++;
 283
 284             if (!OPENSSL_init_crypto(OPENSSL_INIT_ZLIB, NULL)) {
 285                 int_comp_zlib_cleanup();
 286                 return meth;
 287             }
 288             if (zlib_loaded)
 289                 meth = &zlib_stateful_method;
 290         }
 291     }
 292 #endif
 293 #if defined(ZLIB)
 294     meth = &zlib_stateful_method;
 295 #endif
 296
 297     return (meth);
 298 }
 299
 300 void int_comp_zlib_cleanup(void)
 301 {
 302 #ifdef ZLIB_SHARED
 303     if (zlib_dso != NULL)
 304         DSO_free(zlib_dso);
 305     zlib_dso = NULL;
 306 #endif
 307 }
 308
 309 #ifdef ZLIB
 310
 311 /* Zlib based compression/decompression filter BIO */
 312
 313 typedef struct {
 314     unsigned char *ibuf;        /* Input buffer */
 315     int ibufsize;               /* Buffer size */
 316     z_stream zin;               /* Input decompress context */
 317     unsigned char *obuf;        /* Output buffer */
 318     int obufsize;               /* Output buffer size */
 319     unsigned char *optr;        /* Position in output buffer */
 320     int ocount;                 /* Amount of data in output buffer */
 321     int odone;                  /* deflate EOF */
 322     int comp_level;             /* Compression level to use */
 323     z_stream zout;              /* Output compression context */
 324 } BIO_ZLIB_CTX;
 325
 326 # define ZLIB_DEFAULT_BUFSIZE 1024
 327
 328 static int bio_zlib_new(BIO *bi);
 329 static int bio_zlib_free(BIO *bi);
 330 static int bio_zlib_read(BIO *b, char *out, int outl);
 331 static int bio_zlib_write(BIO *b, const char *in, int inl);
 332 static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr);
 333 static long bio_zlib_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp);
 334
 335 static const BIO_METHOD bio_meth_zlib = {
 336     BIO_TYPE_COMP,
 337     "zlib",
 338     bio_zlib_write,
 339     bio_zlib_read,
 340     NULL,
 341     NULL,
 342     bio_zlib_ctrl,
 343     bio_zlib_new,
 344     bio_zlib_free,
 345     bio_zlib_callback_ctrl
 346 };
 347
 348 const BIO_METHOD *BIO_f_zlib(void)
 349 {
 350     return &bio_meth_zlib;
 351 }
 352
 353 static int bio_zlib_new(BIO *bi)
 354 {
 355     BIO_ZLIB_CTX *ctx;
 356 # ifdef ZLIB_SHARED
 357     (void)COMP_zlib();
 358     if (!zlib_loaded) {
 359         COMPerr(COMP_F_BIO_ZLIB_NEW, COMP_R_ZLIB_NOT_SUPPORTED);
 360         return 0;
 361     }
 362 # endif
 363     ctx = OPENSSL_zalloc(sizeof(*ctx));
 364     if (ctx == NULL) {
 365         COMPerr(COMP_F_BIO_ZLIB_NEW, ERR_R_MALLOC_FAILURE);
 366         return 0;
 367     }
 368     ctx->ibufsize = ZLIB_DEFAULT_BUFSIZE;
 369     ctx->obufsize = ZLIB_DEFAULT_BUFSIZE;
 370     ctx->zin.zalloc = Z_NULL;
 371     ctx->zin.zfree = Z_NULL;
 372     ctx->zout.zalloc = Z_NULL;
 373     ctx->zout.zfree = Z_NULL;
 374     ctx->comp_level = Z_DEFAULT_COMPRESSION;
 375     BIO_set_init(bi, 1);
 376     BIO_set_data(bi, ctx);
 377
 378     return 1;
 379 }
 380
 381 static int bio_zlib_free(BIO *bi)
 382 {
 383     BIO_ZLIB_CTX *ctx;
 384     if (!bi)
 385         return 0;
 386     ctx = BIO_get_data(bi);
 387     if (ctx->ibuf) {
 388         /* Destroy decompress context */
 389         inflateEnd(&ctx->zin);
 390         OPENSSL_free(ctx->ibuf);
 391     }
 392     if (ctx->obuf) {
 393         /* Destroy compress context */
 394         deflateEnd(&ctx->zout);
 395         OPENSSL_free(ctx->obuf);
 396     }
 397     OPENSSL_free(ctx);
 398     BIO_set_data(bi, NULL);
 399     BIO_set_init(bi, 0);
 400
 401     return 1;
 402 }
 403
 404 static int bio_zlib_read(BIO *b, char *out, int outl)
 405 {
 406     BIO_ZLIB_CTX *ctx;
 407     int ret;
 408     z_stream *zin;
 409     BIO *next = BIO_next(b);
 410
 411     if (!out || !outl)
 412         return 0;
 413     ctx = BIO_get_data(b);
 414     zin = &ctx->zin;
 415     BIO_clear_retry_flags(b);
 416     if (!ctx->ibuf) {
 417         ctx->ibuf = OPENSSL_malloc(ctx->ibufsize);
 418         if (ctx->ibuf == NULL) {
 419             COMPerr(COMP_F_BIO_ZLIB_READ, ERR_R_MALLOC_FAILURE);
 420             return 0;
 421         }
 422         inflateInit(zin);
 423         zin->next_in = ctx->ibuf;
 424         zin->avail_in = 0;
 425     }
 426
 427     /* Copy output data directly to supplied buffer */
 428     zin->next_out = (unsigned char *)out;
 429     zin->avail_out = (unsigned int)outl;
 430     for (;;) {
 431         /* Decompress while data available */
 432         while (zin->avail_in) {
 433             ret = inflate(zin, 0);
 434             if ((ret != Z_OK) && (ret != Z_STREAM_END)) {
 435                 COMPerr(COMP_F_BIO_ZLIB_READ, COMP_R_ZLIB_INFLATE_ERROR);
 436                 ERR_add_error_data(2, "zlib error:", zError(ret));
 437                 return 0;
 438             }
 439             /* If EOF or we've read everything then return */
 440             if ((ret == Z_STREAM_END) || !zin->avail_out)
 441                 return outl - zin->avail_out;
 442         }
 443
 444         /*
 445          * No data in input buffer try to read some in, if an error then
 446          * return the total data read.
 447          */
 448         ret = BIO_read(next, ctx->ibuf, ctx->ibufsize);
 449         if (ret <= 0) {
 450             /* Total data read */
 451             int tot = outl - zin->avail_out;
 452             BIO_copy_next_retry(b);
 453             if (ret < 0)
 454                 return (tot > 0) ? tot : ret;
 455             return tot;
 456         }
 457         zin->avail_in = ret;
 458         zin->next_in = ctx->ibuf;
 459     }
 460 }
 461
 462 static int bio_zlib_write(BIO *b, const char *in, int inl)
 463 {
 464     BIO_ZLIB_CTX *ctx;
 465     int ret;
 466     z_stream *zout;
 467     BIO *next = BIO_next(b);
 468
 469     if (!in || !inl)
 470         return 0;
 471     ctx = BIO_get_data(b);
 472     if (ctx->odone)
 473         return 0;
 474     zout = &ctx->zout;
 475     BIO_clear_retry_flags(b);
 476     if (!ctx->obuf) {
 477         ctx->obuf = OPENSSL_malloc(ctx->obufsize);
 478         /* Need error here */
 479         if (ctx->obuf == NULL) {
 480             COMPerr(COMP_F_BIO_ZLIB_WRITE, ERR_R_MALLOC_FAILURE);
 481             return 0;
 482         }
 483         ctx->optr = ctx->obuf;
 484         ctx->ocount = 0;
 485         deflateInit(zout, ctx->comp_level);
 486         zout->next_out = ctx->obuf;
 487         zout->avail_out = ctx->obufsize;
 488     }
 489     /* Obtain input data directly from supplied buffer */
 490     zout->next_in = (void *)in;
 491     zout->avail_in = inl;
 492     for (;;) {
 493         /* If data in output buffer write it first */
 494         while (ctx->ocount) {
 495             ret = BIO_write(next, ctx->optr, ctx->ocount);
 496             if (ret <= 0) {
 497                 /* Total data written */
 498                 int tot = inl - zout->avail_in;
 499                 BIO_copy_next_retry(b);
 500                 if (ret < 0)
 501                     return (tot > 0) ? tot : ret;
 502                 return tot;
 503             }
 504             ctx->optr += ret;
 505             ctx->ocount -= ret;
 506         }
 507
 508         /* Have we consumed all supplied data? */
 509         if (!zout->avail_in)
 510             return inl;
 511
 512         /* Compress some more */
 513
 514         /* Reset buffer */
 515         ctx->optr = ctx->obuf;
 516         zout->next_out = ctx->obuf;
 517         zout->avail_out = ctx->obufsize;
 518         /* Compress some more */
 519         ret = deflate(zout, 0);
 520         if (ret != Z_OK) {
 521             COMPerr(COMP_F_BIO_ZLIB_WRITE, COMP_R_ZLIB_DEFLATE_ERROR);
 522             ERR_add_error_data(2, "zlib error:", zError(ret));
 523             return 0;
 524         }
 525         ctx->ocount = ctx->obufsize - zout->avail_out;
 526     }
 527 }
 528
 529 static int bio_zlib_flush(BIO *b)
 530 {
 531     BIO_ZLIB_CTX *ctx;
 532     int ret;
 533     z_stream *zout;
 534     BIO *next = BIO_next(b);
 535
 536     ctx = BIO_get_data(b);
 537     /* If no data written or already flush show success */
 538     if (!ctx->obuf || (ctx->odone && !ctx->ocount))
 539         return 1;
 540     zout = &ctx->zout;
 541     BIO_clear_retry_flags(b);
 542     /* No more input data */
 543     zout->next_in = NULL;
 544     zout->avail_in = 0;
 545     for (;;) {
 546         /* If data in output buffer write it first */
 547         while (ctx->ocount) {
 548             ret = BIO_write(next, ctx->optr, ctx->ocount);
 549             if (ret <= 0) {
 550                 BIO_copy_next_retry(b);
 551                 return ret;
 552             }
 553             ctx->optr += ret;
 554             ctx->ocount -= ret;
 555         }
 556         if (ctx->odone)
 557             return 1;
 558
 559         /* Compress some more */
 560
 561         /* Reset buffer */
 562         ctx->optr = ctx->obuf;
 563         zout->next_out = ctx->obuf;
 564         zout->avail_out = ctx->obufsize;
 565         /* Compress some more */
 566         ret = deflate(zout, Z_FINISH);
 567         if (ret == Z_STREAM_END)
 568             ctx->odone = 1;
 569         else if (ret != Z_OK) {
 570             COMPerr(COMP_F_BIO_ZLIB_FLUSH, COMP_R_ZLIB_DEFLATE_ERROR);
 571             ERR_add_error_data(2, "zlib error:", zError(ret));
 572             return 0;
 573         }
 574         ctx->ocount = ctx->obufsize - zout->avail_out;
 575     }
 576 }
 577
 578 static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr)
 579 {
 580     BIO_ZLIB_CTX *ctx;
 581     int ret, *ip;
 582     int ibs, obs;
 583     BIO *next = BIO_next(b);
 584
 585     if (next == NULL)
 586         return 0;
 587     ctx = BIO_get_data(b);
 588     switch (cmd) {
 589
 590     case BIO_CTRL_RESET:
 591         ctx->ocount = 0;
 592         ctx->odone = 0;
 593         ret = 1;
 594         break;
 595
 596     case BIO_CTRL_FLUSH:
 597         ret = bio_zlib_flush(b);
 598         if (ret > 0)
 599             ret = BIO_flush(next);
 600         break;
 601
 602     case BIO_C_SET_BUFF_SIZE:
 603         ibs = -1;
 604         obs = -1;
 605         if (ptr != NULL) {
 606             ip = ptr;
 607             if (*ip == 0)
 608                 ibs = (int)num;
 609             else
 610                 obs = (int)num;
 611         } else {
 612             ibs = (int)num;
 613             obs = ibs;
 614         }
 615
 616         if (ibs != -1) {
 617             OPENSSL_free(ctx->ibuf);
 618             ctx->ibuf = NULL;
 619             ctx->ibufsize = ibs;
 620         }
 621
 622         if (obs != -1) {
 623             OPENSSL_free(ctx->obuf);
 624             ctx->obuf = NULL;
 625             ctx->obufsize = obs;
 626         }
 627         ret = 1;
 628         break;
 629
 630     case BIO_C_DO_STATE_MACHINE:
 631         BIO_clear_retry_flags(b);
 632         ret = BIO_ctrl(next, cmd, num, ptr);
 633         BIO_copy_next_retry(b);
 634         break;
 635
 636     default:
 637         ret = BIO_ctrl(next, cmd, num, ptr);
 638         break;
 639
 640     }
 641
 642     return ret;
 643 }
 644
 645 static long bio_zlib_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
 646 {
 647     BIO *next = BIO_next(b);
 648     if (next == NULL)
 649         return 0;
 650     return BIO_callback_ctrl(next, cmd, fp);
 651 }
 652
 653 #endif