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
   7 COMP_METHOD *COMP_zlib(void );
   8
   9 static COMP_METHOD zlib_method_nozlib={
  10         NID_undef,
  11         "(undef)",
  12         NULL,
  13         NULL,
  14         NULL,
  15         NULL,
  16         NULL,
  17         NULL,
  18         };
  19
  20 #ifndef ZLIB
  21 #undef ZLIB_SHARED
  22 #else
  23
  24 #include <zlib.h>
  25
  26 static int zlib_stateful_init(COMP_CTX *ctx);
  27 static void zlib_stateful_finish(COMP_CTX *ctx);
  28 static int zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out,
  29         unsigned int olen, unsigned char *in, unsigned int ilen);
  30 static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
  31         unsigned int olen, unsigned char *in, unsigned int ilen);
  32
  33 static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
  34         unsigned int olen, unsigned char *in, unsigned int ilen);
  35 static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
  36         unsigned int olen, unsigned char *in, unsigned int ilen);
  37
  38 static int zz_uncompress(Bytef *dest, uLongf *destLen, const Bytef *source,
  39         uLong sourceLen);
  40
  41 static COMP_METHOD zlib_stateless_method={
  42         NID_zlib_compression,
  43         LN_zlib_compression,
  44         NULL,
  45         NULL,
  46         zlib_compress_block,
  47         zlib_expand_block,
  48         NULL,
  49         NULL,
  50         };
  51
  52 static COMP_METHOD zlib_stateful_method={
  53         NID_zlib_compression,
  54         LN_zlib_compression,
  55         zlib_stateful_init,
  56         zlib_stateful_finish,
  57         zlib_stateful_compress_block,
  58         zlib_stateful_expand_block,
  59         NULL,
  60         NULL,
  61         };
  62
  63 /*
  64  * When OpenSSL is built on Windows, we do not want to require that
  65  * the ZLIB.DLL be available in order for the OpenSSL DLLs to
  66  * work.  Therefore, all ZLIB routines are loaded at run time
  67  * and we do not link to a .LIB file.
  68  */
  69 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
  70 # include <windows.h>
  71
  72 # define Z_CALLCONV _stdcall
  73 # define ZLIB_SHARED
  74 #else
  75 # define Z_CALLCONV
  76 #endif /* !(OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32) */
  77
  78 #ifdef ZLIB_SHARED
  79 #include <openssl/dso.h>
  80
  81 /* Prototypes for built in stubs */
  82 static int stub_compress(Bytef *dest,uLongf *destLen,
  83         const Bytef *source, uLong sourceLen);
  84 static int stub_inflateEnd(z_streamp strm);
  85 static int stub_inflate(z_streamp strm, int flush);
  86 static int stub_inflateInit_(z_streamp strm, const char * version,
  87         int stream_size);
  88
  89 /* Function pointers */
  90 typedef int (Z_CALLCONV *compress_ft)(Bytef *dest,uLongf *destLen,
  91         const Bytef *source, uLong sourceLen);
  92 typedef int (Z_CALLCONV *inflateEnd_ft)(z_streamp strm);
  93 typedef int (Z_CALLCONV *inflate_ft)(z_streamp strm, int flush);
  94 typedef int (Z_CALLCONV *inflateInit__ft)(z_streamp strm,
  95         const char * version, int stream_size);
  96 typedef int (Z_CALLCONV *deflateEnd_ft)(z_streamp strm);
  97 typedef int (Z_CALLCONV *deflate_ft)(z_streamp strm, int flush);
  98 typedef int (Z_CALLCONV *deflateInit__ft)(z_streamp strm, int level,
  99         const char * version, int stream_size);
 100 static compress_ft      p_compress=NULL;
 101 static inflateEnd_ft    p_inflateEnd=NULL;
 102 static inflate_ft       p_inflate=NULL;
 103 static inflateInit__ft  p_inflateInit_=NULL;
 104 static deflateEnd_ft    p_deflateEnd=NULL;
 105 static deflate_ft       p_deflate=NULL;
 106 static deflateInit__ft  p_deflateInit_=NULL;
 107
 108 static int zlib_loaded = 0;     /* only attempt to init func pts once */
 109 static DSO *zlib_dso = NULL;
 110
 111 #define compress                stub_compress
 112 #define inflateEnd              stub_inflateEnd
 113 #define inflate                 stub_inflate
 114 #define inflateInit             stub_inflateInit
 115 #define inflateInit_            stub_inflateInit_
 116 #define deflateEnd              stub_deflateEnd
 117 #define deflate                 stub_deflate
 118 #define deflateInit             stub_deflateInit
 119 #define deflateInit_            stub_deflateInit_
 120 #endif /* ZLIB_SHARED */
 121
 122 struct zlib_state
 123         {
 124         z_stream istream;
 125         z_stream ostream;
 126         };
 127
 128 static int zlib_stateful_ex_idx = -1;
 129
 130 static void zlib_stateful_free_ex_data(void *obj, void *item,
 131         CRYPTO_EX_DATA *ad, int ind,long argl, void *argp)
 132         {
 133         struct zlib_state *state = (struct zlib_state *)item;
 134         inflateEnd(&state->istream);
 135         deflateEnd(&state->ostream);
 136         OPENSSL_free(state);
 137         }
 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 = Z_NULL;
 149         state->istream.zfree = Z_NULL;
 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         if (err != Z_OK)
 157                 goto err;
 158
 159         state->ostream.zalloc = Z_NULL;
 160         state->ostream.zfree = Z_NULL;
 161         state->ostream.opaque = Z_NULL;
 162         state->ostream.next_in = Z_NULL;
 163         state->ostream.next_out = Z_NULL;
 164         state->ostream.avail_in = 0;
 165         state->ostream.avail_out = 0;
 166         err = deflateInit(&state->ostream,Z_DEFAULT_COMPRESSION);
 167         if (err != Z_OK)
 168                 goto err;
 169
 170         CRYPTO_new_ex_data(CRYPTO_EX_INDEX_COMP,ctx,&ctx->ex_data);
 171         if (zlib_stateful_ex_idx == -1)
 172                 {
 173                 zlib_stateful_ex_idx =
 174                         CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_COMP,
 175                                 0,NULL,NULL,NULL,zlib_stateful_free_ex_data);
 176                 if (zlib_stateful_ex_idx == -1)
 177                         goto err;
 178                 }
 179         CRYPTO_set_ex_data(&ctx->ex_data,zlib_stateful_ex_idx,state);
 180         return 1;
 181  err:
 182         if (state) OPENSSL_free(state);
 183         return 0;
 184         }
 185
 186 static void zlib_stateful_finish(COMP_CTX *ctx)
 187         {
 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 static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
 247         unsigned int olen, unsigned char *in, unsigned int ilen)
 248         {
 249         unsigned long l;
 250         int i;
 251         int clear=1;
 252
 253         if (ilen > 128)
 254                 {
 255                 out[0]=1;
 256                 l=olen-1;
 257                 i=compress(&(out[1]),&l,in,(unsigned long)ilen);
 258                 if (i != Z_OK)
 259                         return(-1);
 260                 if (ilen > l)
 261                         {
 262                         clear=0;
 263                         l++;
 264                         }
 265                 }
 266         if (clear)
 267                 {
 268                 out[0]=0;
 269                 memcpy(&(out[1]),in,ilen);
 270                 l=ilen+1;
 271                 }
 272 #ifdef DEBUG_ZLIB
 273         fprintf(stderr,"compress(%4d)->%4d %s\n",
 274                 ilen,(int)l,(clear)?"clear":"zlib");
 275 #endif
 276         return((int)l);
 277         }
 278
 279 static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
 280         unsigned int olen, unsigned char *in, unsigned int ilen)
 281         {
 282         unsigned long l;
 283         int i;
 284
 285         if (in[0])
 286                 {
 287                 l=olen;
 288                 i=zz_uncompress(out,&l,&(in[1]),(unsigned long)ilen-1);
 289                 if (i != Z_OK)
 290                         return(-1);
 291                 }
 292         else
 293                 {
 294                 memcpy(out,&(in[1]),ilen-1);
 295                 l=ilen-1;
 296                 }
 297 #ifdef DEBUG_ZLIB
 298         fprintf(stderr,"expand  (%4d)->%4d %s\n",
 299                 ilen,(int)l,in[0]?"zlib":"clear");
 300 #endif
 301         return((int)l);
 302         }
 303
 304 static int zz_uncompress (Bytef *dest, uLongf *destLen, const Bytef *source,
 305              uLong sourceLen)
 306 {
 307     z_stream stream;
 308     int err;
 309
 310     stream.next_in = (Bytef*)source;
 311     stream.avail_in = (uInt)sourceLen;
 312     /* Check for source > 64K on 16-bit machine: */
 313     if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
 314
 315     stream.next_out = dest;
 316     stream.avail_out = (uInt)*destLen;
 317     if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
 318
 319     stream.zalloc = (alloc_func)0;
 320     stream.zfree = (free_func)0;
 321
 322     err = inflateInit(&stream);
 323     if (err != Z_OK) return err;
 324
 325     err = inflate(&stream, Z_FINISH);
 326     if (err != Z_STREAM_END) {
 327         inflateEnd(&stream);
 328         return err;
 329     }
 330     *destLen = stream.total_out;
 331
 332     err = inflateEnd(&stream);
 333     return err;
 334 }
 335
 336 #endif
 337
 338 COMP_METHOD *COMP_zlib(void)
 339         {
 340         COMP_METHOD *meth = &zlib_method_nozlib;
 341
 342 #ifdef ZLIB_SHARED
 343         if (!zlib_loaded)
 344                 {
 345 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
 346                 zlib_dso = DSO_load(NULL, "ZLIB", NULL, 0);
 347 #else
 348                 zlib_dso = DSO_load(NULL, "z", NULL, 0);
 349 #endif
 350                 if (zlib_dso != NULL)
 351                         {
 352                         p_compress
 353                                 = (compress_ft) DSO_bind_func(zlib_dso,
 354                                         "compress");
 355                         p_inflateEnd
 356                                 = (inflateEnd_ft) DSO_bind_func(zlib_dso,
 357                                         "inflateEnd");
 358                         p_inflate
 359                                 = (inflate_ft) DSO_bind_func(zlib_dso,
 360                                         "inflate");
 361                         p_inflateInit_
 362                                 = (inflateInit__ft) DSO_bind_func(zlib_dso,
 363                                         "inflateInit_");
 364                         p_deflateEnd
 365                                 = (deflateEnd_ft) DSO_bind_func(zlib_dso,
 366                                         "deflateEnd");
 367                         p_deflate
 368                                 = (deflate_ft) DSO_bind_func(zlib_dso,
 369                                         "deflate");
 370                         p_deflateInit_
 371                                 = (deflateInit__ft) DSO_bind_func(zlib_dso,
 372                                         "deflateInit_");
 373                         zlib_loaded++;
 374                         }
 375                 }
 376
 377 #endif
 378 #if defined(ZLIB) || defined(ZLIB_SHARED)
 379         meth = &zlib_stateful_method;
 380 #endif
 381
 382         return(meth);
 383         }
 384
 385 #ifdef ZLIB_SHARED
 386 /* Stubs for each function to be dynamicly loaded */
 387 static int
 388 stub_compress(Bytef *dest,uLongf *destLen,const Bytef *source, uLong sourceLen)
 389         {
 390         if (p_compress)
 391                 return(p_compress(dest,destLen,source,sourceLen));
 392         else
 393                 return(Z_MEM_ERROR);
 394         }
 395
 396 static int
 397 stub_inflateEnd(z_streamp strm)
 398         {
 399         if ( p_inflateEnd )
 400                 return(p_inflateEnd(strm));
 401         else
 402                 return(Z_MEM_ERROR);
 403         }
 404
 405 static int
 406 stub_inflate(z_streamp strm, int flush)
 407         {
 408         if ( p_inflate )
 409                 return(p_inflate(strm,flush));
 410         else
 411                 return(Z_MEM_ERROR);
 412         }
 413
 414 static int
 415 stub_inflateInit_(z_streamp strm, const char * version, int stream_size)
 416         {
 417         if ( p_inflateInit_ )
 418                 return(p_inflateInit_(strm,version,stream_size));
 419         else
 420                 return(Z_MEM_ERROR);
 421         }
 422
 423 static int
 424 stub_deflateEnd(z_streamp strm)
 425         {
 426         if ( p_deflateEnd )
 427                 return(p_deflateEnd(strm));
 428         else
 429                 return(Z_MEM_ERROR);
 430         }
 431
 432 static int
 433 stub_deflate(z_streamp strm, int flush)
 434         {
 435         if ( p_deflate )
 436                 return(p_deflate(strm,flush));
 437         else
 438                 return(Z_MEM_ERROR);
 439         }
 440
 441 static int
 442 stub_deflateInit_(z_streamp strm, int level,
 443         const char * version, int stream_size)
 444         {
 445         if ( p_deflateInit_ )
 446                 return(p_deflateInit_(strm,version,stream_size));
 447         else
 448                 return(Z_MEM_ERROR);
 449         }
 450
 451 #endif /* ZLIB_SHARED */