crypto/comp/c_zlib.c

   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