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         return olen - state->ostream.avail_out;
 211         }
 212
 213 static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
 214         unsigned int olen, unsigned char *in, unsigned int ilen)
 215         {
 216         int err = Z_OK;
 217
 218         struct zlib_state *state =
 219                 (struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
 220                         zlib_stateful_ex_idx);
 221
 222         if (state == NULL)
 223                 return 0;
 224
 225         state->istream.next_in = in;
 226         state->istream.avail_in = ilen;
 227         state->istream.next_out = out;
 228         state->istream.avail_out = olen;
 229         if (ilen > 0)
 230                 err = inflate(&state->istream, Z_SYNC_FLUSH);
 231         if (err != Z_OK)
 232                 return -1;
 233         return olen - state->istream.avail_out;
 234         }
 235
 236 static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
 237         unsigned int olen, unsigned char *in, unsigned int ilen)
 238         {
 239         unsigned long l;
 240         int i;
 241         int clear=1;
 242
 243         if (ilen > 128)
 244                 {
 245                 out[0]=1;
 246                 l=olen-1;
 247                 i=compress(&(out[1]),&l,in,(unsigned long)ilen);
 248                 if (i != Z_OK)
 249                         return(-1);
 250                 if (ilen > l)
 251                         {
 252                         clear=0;
 253                         l++;
 254                         }
 255                 }
 256         if (clear)
 257                 {
 258                 out[0]=0;
 259                 memcpy(&(out[1]),in,ilen);
 260                 l=ilen+1;
 261                 }
 262 #ifdef DEBUG_ZLIB
 263         fprintf(stderr,"compress(%4d)->%4d %s\n",
 264                 ilen,(int)l,(clear)?"clear":"zlib");
 265 #endif
 266         return((int)l);
 267         }
 268
 269 static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
 270         unsigned int olen, unsigned char *in, unsigned int ilen)
 271         {
 272         unsigned long l;
 273         int i;
 274
 275         if (in[0])
 276                 {
 277                 l=olen;
 278                 i=zz_uncompress(out,&l,&(in[1]),(unsigned long)ilen-1);
 279                 if (i != Z_OK)
 280                         return(-1);
 281                 }
 282         else
 283                 {
 284                 memcpy(out,&(in[1]),ilen-1);
 285                 l=ilen-1;
 286                 }
 287 #ifdef DEBUG_ZLIB
 288         fprintf(stderr,"expand  (%4d)->%4d %s\n",
 289                 ilen,(int)l,in[0]?"zlib":"clear");
 290 #endif
 291         return((int)l);
 292         }
 293
 294 static int zz_uncompress (Bytef *dest, uLongf *destLen, const Bytef *source,
 295              uLong sourceLen)
 296 {
 297     z_stream stream;
 298     int err;
 299
 300     stream.next_in = (Bytef*)source;
 301     stream.avail_in = (uInt)sourceLen;
 302     /* Check for source > 64K on 16-bit machine: */
 303     if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
 304
 305     stream.next_out = dest;
 306     stream.avail_out = (uInt)*destLen;
 307     if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
 308
 309     stream.zalloc = (alloc_func)0;
 310     stream.zfree = (free_func)0;
 311
 312     err = inflateInit(&stream);
 313     if (err != Z_OK) return err;
 314
 315     err = inflate(&stream, Z_FINISH);
 316     if (err != Z_STREAM_END) {
 317         inflateEnd(&stream);
 318         return err;
 319     }
 320     *destLen = stream.total_out;
 321
 322     err = inflateEnd(&stream);
 323     return err;
 324 }
 325
 326 #endif
 327
 328 COMP_METHOD *COMP_zlib(void)
 329         {
 330         COMP_METHOD *meth = &zlib_method_nozlib;
 331
 332 #ifdef ZLIB_SHARED
 333         if (!zlib_loaded)
 334                 {
 335 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
 336                 zlib_dso = DSO_load(NULL, "ZLIB", NULL, 0);
 337 #else
 338                 zlib_dso = DSO_load(NULL, "z", NULL, 0);
 339 #endif
 340                 if (zlib_dso != NULL)
 341                         {
 342                         p_compress
 343                                 = (compress_ft) DSO_bind_func(zlib_dso,
 344                                         "compress");
 345                         p_inflateEnd
 346                                 = (inflateEnd_ft) DSO_bind_func(zlib_dso,
 347                                         "inflateEnd");
 348                         p_inflate
 349                                 = (inflate_ft) DSO_bind_func(zlib_dso,
 350                                         "inflate");
 351                         p_inflateInit_
 352                                 = (inflateInit__ft) DSO_bind_func(zlib_dso,
 353                                         "inflateInit_");
 354                         p_deflateEnd
 355                                 = (deflateEnd_ft) DSO_bind_func(zlib_dso,
 356                                         "deflateEnd");
 357                         p_deflate
 358                                 = (deflate_ft) DSO_bind_func(zlib_dso,
 359                                         "deflate");
 360                         p_deflateInit_
 361                                 = (deflateInit__ft) DSO_bind_func(zlib_dso,
 362                                         "deflateInit_");
 363                         zlib_loaded++;
 364                         }
 365                 }
 366
 367 #endif
 368 #if defined(ZLIB) || defined(ZLIB_SHARED)
 369         meth = &zlib_stateful_method;
 370 #endif
 371
 372         return(meth);
 373         }
 374
 375 #ifdef ZLIB_SHARED
 376 /* Stubs for each function to be dynamicly loaded */
 377 static int
 378 stub_compress(Bytef *dest,uLongf *destLen,const Bytef *source, uLong sourceLen)
 379         {
 380         if (p_compress)
 381                 return(p_compress(dest,destLen,source,sourceLen));
 382         else
 383                 return(Z_MEM_ERROR);
 384         }
 385
 386 static int
 387 stub_inflateEnd(z_streamp strm)
 388         {
 389         if ( p_inflateEnd )
 390                 return(p_inflateEnd(strm));
 391         else
 392                 return(Z_MEM_ERROR);
 393         }
 394
 395 static int
 396 stub_inflate(z_streamp strm, int flush)
 397         {
 398         if ( p_inflate )
 399                 return(p_inflate(strm,flush));
 400         else
 401                 return(Z_MEM_ERROR);
 402         }
 403
 404 static int
 405 stub_inflateInit_(z_streamp strm, const char * version, int stream_size)
 406         {
 407         if ( p_inflateInit_ )
 408                 return(p_inflateInit_(strm,version,stream_size));
 409         else
 410                 return(Z_MEM_ERROR);
 411         }
 412
 413 static int
 414 stub_deflateEnd(z_streamp strm)
 415         {
 416         if ( p_deflateEnd )
 417                 return(p_deflateEnd(strm));
 418         else
 419                 return(Z_MEM_ERROR);
 420         }
 421
 422 static int
 423 stub_deflate(z_streamp strm, int flush)
 424         {
 425         if ( p_deflate )
 426                 return(p_deflate(strm,flush));
 427         else
 428                 return(Z_MEM_ERROR);
 429         }
 430
 431 static int
 432 stub_deflateInit_(z_streamp strm, int level,
 433         const char * version, int stream_size)
 434         {
 435         if ( p_deflateInit_ )
 436                 return(p_deflateInit_(strm,version,stream_size));
 437         else
 438                 return(Z_MEM_ERROR);
 439         }
 440
 441 #endif /* ZLIB_SHARED */