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 #if 0
  34 static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
  35         unsigned int olen, unsigned char *in, unsigned int ilen);
  36 static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
  37         unsigned int olen, unsigned char *in, unsigned int ilen);
  38
  39 static int zz_uncompress(Bytef *dest, uLongf *destLen, const Bytef *source,
  40         uLong sourceLen);
  41
  42 static COMP_METHOD zlib_stateless_method={
  43         NID_zlib_compression,
  44         LN_zlib_compression,
  45         NULL,
  46         NULL,
  47         zlib_compress_block,
  48         zlib_expand_block,
  49         NULL,
  50         NULL,
  51         };
  52 #endif
  53
  54 static COMP_METHOD zlib_stateful_method={
  55         NID_zlib_compression,
  56         LN_zlib_compression,
  57         zlib_stateful_init,
  58         zlib_stateful_finish,
  59         zlib_stateful_compress_block,
  60         zlib_stateful_expand_block,
  61         NULL,
  62         NULL,
  63         };
  64
  65 /*
  66  * When OpenSSL is built on Windows, we do not want to require that
  67  * the ZLIB.DLL be available in order for the OpenSSL DLLs to
  68  * work.  Therefore, all ZLIB routines are loaded at run time
  69  * and we do not link to a .LIB file.
  70  */
  71 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
  72 # include <windows.h>
  73
  74 # define Z_CALLCONV _stdcall
  75 # define ZLIB_SHARED
  76 #else
  77 # define Z_CALLCONV
  78 #endif /* !(OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32) */
  79
  80 #ifdef ZLIB_SHARED
  81 #include <openssl/dso.h>
  82
  83 /* Prototypes for built in stubs */
  84 #if 0
  85 static int stub_compress(Bytef *dest,uLongf *destLen,
  86         const Bytef *source, uLong sourceLen);
  87 #endif
  88 static int stub_inflateEnd(z_streamp strm);
  89 static int stub_inflate(z_streamp strm, int flush);
  90 static int stub_inflateInit_(z_streamp strm, const char * version,
  91         int stream_size);
  92 static int stub_deflateEnd(z_streamp strm);
  93 static int stub_deflate(z_streamp strm, int flush);
  94 static int stub_deflateInit_(z_streamp strm, int level,
  95         const char * version, int stream_size);
  96
  97 /* Function pointers */
  98 typedef int (Z_CALLCONV *compress_ft)(Bytef *dest,uLongf *destLen,
  99         const Bytef *source, uLong sourceLen);
 100 typedef int (Z_CALLCONV *inflateEnd_ft)(z_streamp strm);
 101 typedef int (Z_CALLCONV *inflate_ft)(z_streamp strm, int flush);
 102 typedef int (Z_CALLCONV *inflateInit__ft)(z_streamp strm,
 103         const char * version, int stream_size);
 104 typedef int (Z_CALLCONV *deflateEnd_ft)(z_streamp strm);
 105 typedef int (Z_CALLCONV *deflate_ft)(z_streamp strm, int flush);
 106 typedef int (Z_CALLCONV *deflateInit__ft)(z_streamp strm, int level,
 107         const char * version, int stream_size);
 108 static compress_ft      p_compress=NULL;
 109 static inflateEnd_ft    p_inflateEnd=NULL;
 110 static inflate_ft       p_inflate=NULL;
 111 static inflateInit__ft  p_inflateInit_=NULL;
 112 static deflateEnd_ft    p_deflateEnd=NULL;
 113 static deflate_ft       p_deflate=NULL;
 114 static deflateInit__ft  p_deflateInit_=NULL;
 115
 116 static int zlib_loaded = 0;     /* only attempt to init func pts once */
 117 static DSO *zlib_dso = NULL;
 118
 119 #define compress                stub_compress
 120 #define inflateEnd              stub_inflateEnd
 121 #define inflate                 stub_inflate
 122 #define inflateInit_            stub_inflateInit_
 123 #define deflateEnd              stub_deflateEnd
 124 #define deflate                 stub_deflate
 125 #define deflateInit_            stub_deflateInit_
 126 #endif /* ZLIB_SHARED */
 127
 128 struct zlib_state
 129         {
 130         z_stream istream;
 131         z_stream ostream;
 132         };
 133
 134 static int zlib_stateful_ex_idx = -1;
 135
 136 static void zlib_stateful_free_ex_data(void *obj, void *item,
 137         CRYPTO_EX_DATA *ad, int ind,long argl, void *argp)
 138         {
 139         struct zlib_state *state = (struct zlib_state *)item;
 140         inflateEnd(&state->istream);
 141         deflateEnd(&state->ostream);
 142         OPENSSL_free(state);
 143         }
 144
 145 static int zlib_stateful_init(COMP_CTX *ctx)
 146         {
 147         int err;
 148         struct zlib_state *state =
 149                 (struct zlib_state *)OPENSSL_malloc(sizeof(struct zlib_state));
 150
 151         if (state == NULL)
 152                 goto err;
 153
 154         state->istream.zalloc = Z_NULL;
 155         state->istream.zfree = Z_NULL;
 156         state->istream.opaque = Z_NULL;
 157         state->istream.next_in = Z_NULL;
 158         state->istream.next_out = Z_NULL;
 159         state->istream.avail_in = 0;
 160         state->istream.avail_out = 0;
 161         err = inflateInit_(&state->istream,
 162                 ZLIB_VERSION, sizeof(z_stream));
 163         if (err != Z_OK)
 164                 goto err;
 165
 166         state->ostream.zalloc = Z_NULL;
 167         state->ostream.zfree = Z_NULL;
 168         state->ostream.opaque = Z_NULL;
 169         state->ostream.next_in = Z_NULL;
 170         state->ostream.next_out = Z_NULL;
 171         state->ostream.avail_in = 0;
 172         state->ostream.avail_out = 0;
 173         err = deflateInit_(&state->ostream,Z_DEFAULT_COMPRESSION,
 174                 ZLIB_VERSION, sizeof(z_stream));
 175         if (err != Z_OK)
 176                 goto err;
 177
 178         CRYPTO_new_ex_data(CRYPTO_EX_INDEX_COMP,ctx,&ctx->ex_data);
 179         if (zlib_stateful_ex_idx == -1)
 180                 {
 181                 CRYPTO_w_lock(CRYPTO_LOCK_COMP);
 182                 if (zlib_stateful_ex_idx == -1)
 183                         zlib_stateful_ex_idx =
 184                                 CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_COMP,
 185                                         0,NULL,NULL,NULL,zlib_stateful_free_ex_data);
 186                 CRYPTO_w_unlock(CRYPTO_LOCK_COMP);
 187                 if (zlib_stateful_ex_idx == -1)
 188                         goto err;
 189                 }
 190         CRYPTO_set_ex_data(&ctx->ex_data,zlib_stateful_ex_idx,state);
 191         return 1;
 192  err:
 193         if (state) OPENSSL_free(state);
 194         return 0;
 195         }
 196
 197 static void zlib_stateful_finish(COMP_CTX *ctx)
 198         {
 199         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_COMP,ctx,&ctx->ex_data);
 200         }
 201
 202 static int zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out,
 203         unsigned int olen, unsigned char *in, unsigned int ilen)
 204         {
 205         int err = Z_OK;
 206         struct zlib_state *state =
 207                 (struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
 208                         zlib_stateful_ex_idx);
 209
 210         if (state == NULL)
 211                 return -1;
 212
 213         state->ostream.next_in = in;
 214         state->ostream.avail_in = ilen;
 215         state->ostream.next_out = out;
 216         state->ostream.avail_out = olen;
 217         if (ilen > 0)
 218                 err = deflate(&state->ostream, Z_SYNC_FLUSH);
 219         if (err != Z_OK)
 220                 return -1;
 221 #ifdef DEBUG_ZLIB
 222         fprintf(stderr,"compress(%4d)->%4d %s\n",
 223                 ilen,olen - state->ostream.avail_out,
 224                 (ilen != olen - state->ostream.avail_out)?"zlib":"clear");
 225 #endif
 226         return olen - state->ostream.avail_out;
 227         }
 228
 229 static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
 230         unsigned int olen, unsigned char *in, unsigned int ilen)
 231         {
 232         int err = Z_OK;
 233
 234         struct zlib_state *state =
 235                 (struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
 236                         zlib_stateful_ex_idx);
 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 #ifdef DEBUG_ZLIB
 250         fprintf(stderr,"expand(%4d)->%4d %s\n",
 251                 ilen,olen - state->istream.avail_out,
 252                 (ilen != olen - state->istream.avail_out)?"zlib":"clear");
 253 #endif
 254         return olen - state->istream.avail_out;
 255         }
 256
 257 #if 0
 258 static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
 259         unsigned int olen, unsigned char *in, unsigned int ilen)
 260         {
 261         unsigned long l;
 262         int i;
 263         int clear=1;
 264
 265         if (ilen > 128)
 266                 {
 267                 out[0]=1;
 268                 l=olen-1;
 269                 i=compress(&(out[1]),&l,in,(unsigned long)ilen);
 270                 if (i != Z_OK)
 271                         return(-1);
 272                 if (ilen > l)
 273                         {
 274                         clear=0;
 275                         l++;
 276                         }
 277                 }
 278         if (clear)
 279                 {
 280                 out[0]=0;
 281                 memcpy(&(out[1]),in,ilen);
 282                 l=ilen+1;
 283                 }
 284 #ifdef DEBUG_ZLIB
 285         fprintf(stderr,"compress(%4d)->%4d %s\n",
 286                 ilen,(int)l,(clear)?"clear":"zlib");
 287 #endif
 288         return((int)l);
 289         }
 290
 291 static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
 292         unsigned int olen, unsigned char *in, unsigned int ilen)
 293         {
 294         unsigned long l;
 295         int i;
 296
 297         if (in[0])
 298                 {
 299                 l=olen;
 300                 i=zz_uncompress(out,&l,&(in[1]),(unsigned long)ilen-1);
 301                 if (i != Z_OK)
 302                         return(-1);
 303                 }
 304         else
 305                 {
 306                 memcpy(out,&(in[1]),ilen-1);
 307                 l=ilen-1;
 308                 }
 309 #ifdef DEBUG_ZLIB
 310         fprintf(stderr,"expand  (%4d)->%4d %s\n",
 311                 ilen,(int)l,in[0]?"zlib":"clear");
 312 #endif
 313         return((int)l);
 314         }
 315
 316 static int zz_uncompress (Bytef *dest, uLongf *destLen, const Bytef *source,
 317              uLong sourceLen)
 318 {
 319     z_stream stream;
 320     int err;
 321
 322     stream.next_in = (Bytef*)source;
 323     stream.avail_in = (uInt)sourceLen;
 324     /* Check for source > 64K on 16-bit machine: */
 325     if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
 326
 327     stream.next_out = dest;
 328     stream.avail_out = (uInt)*destLen;
 329     if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
 330
 331     stream.zalloc = (alloc_func)0;
 332     stream.zfree = (free_func)0;
 333
 334     err = inflateInit_(&stream,
 335             ZLIB_VERSION, sizeof(z_stream));
 336     if (err != Z_OK) return err;
 337
 338     err = inflate(&stream, Z_FINISH);
 339     if (err != Z_STREAM_END) {
 340         inflateEnd(&stream);
 341         return err;
 342     }
 343     *destLen = stream.total_out;
 344
 345     err = inflateEnd(&stream);
 346     return err;
 347 }
 348 #endif
 349
 350 #endif
 351
 352 COMP_METHOD *COMP_zlib(void)
 353         {
 354         COMP_METHOD *meth = &zlib_method_nozlib;
 355
 356 #ifdef ZLIB_SHARED
 357         if (!zlib_loaded)
 358                 {
 359 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
 360                 zlib_dso = DSO_load(NULL, "ZLIB", NULL, 0);
 361 #else
 362                 zlib_dso = DSO_load(NULL, "z", NULL, 0);
 363 #endif
 364                 if (zlib_dso != NULL)
 365                         {
 366                         p_compress
 367                                 = (compress_ft) DSO_bind_func(zlib_dso,
 368                                         "compress");
 369                         p_inflateEnd
 370                                 = (inflateEnd_ft) DSO_bind_func(zlib_dso,
 371                                         "inflateEnd");
 372                         p_inflate
 373                                 = (inflate_ft) DSO_bind_func(zlib_dso,
 374                                         "inflate");
 375                         p_inflateInit_
 376                                 = (inflateInit__ft) DSO_bind_func(zlib_dso,
 377                                         "inflateInit_");
 378                         p_deflateEnd
 379                                 = (deflateEnd_ft) DSO_bind_func(zlib_dso,
 380                                         "deflateEnd");
 381                         p_deflate
 382                                 = (deflate_ft) DSO_bind_func(zlib_dso,
 383                                         "deflate");
 384                         p_deflateInit_
 385                                 = (deflateInit__ft) DSO_bind_func(zlib_dso,
 386                                         "deflateInit_");
 387                         zlib_loaded++;
 388                         }
 389                 }
 390
 391 #endif
 392 #if defined(ZLIB) || defined(ZLIB_SHARED)
 393         meth = &zlib_stateful_method;
 394 #endif
 395
 396         return(meth);
 397         }
 398
 399 #ifdef ZLIB_SHARED
 400 #if 0
 401 /* Stubs for each function to be dynamicly loaded */
 402 static int
 403 stub_compress(Bytef *dest,uLongf *destLen,const Bytef *source, uLong sourceLen)
 404         {
 405         if (p_compress)
 406                 return(p_compress(dest,destLen,source,sourceLen));
 407         else
 408                 return(Z_MEM_ERROR);
 409         }
 410 #endif
 411
 412 static int
 413 stub_inflateEnd(z_streamp strm)
 414         {
 415         if ( p_inflateEnd )
 416                 return(p_inflateEnd(strm));
 417         else
 418                 return(Z_MEM_ERROR);
 419         }
 420
 421 static int
 422 stub_inflate(z_streamp strm, int flush)
 423         {
 424         if ( p_inflate )
 425                 return(p_inflate(strm,flush));
 426         else
 427                 return(Z_MEM_ERROR);
 428         }
 429
 430 static int
 431 stub_inflateInit_(z_streamp strm, const char * version, int stream_size)
 432         {
 433         if ( p_inflateInit_ )
 434                 return(p_inflateInit_(strm,version,stream_size));
 435         else
 436                 return(Z_MEM_ERROR);
 437         }
 438
 439 static int
 440 stub_deflateEnd(z_streamp strm)
 441         {
 442         if ( p_deflateEnd )
 443                 return(p_deflateEnd(strm));
 444         else
 445                 return(Z_MEM_ERROR);
 446         }
 447
 448 static int
 449 stub_deflate(z_streamp strm, int flush)
 450         {
 451         if ( p_deflate )
 452                 return(p_deflate(strm,flush));
 453         else
 454                 return(Z_MEM_ERROR);
 455         }
 456
 457 static int
 458 stub_deflateInit_(z_streamp strm, int level,
 459         const char * version, int stream_size)
 460         {
 461         if ( p_deflateInit_ )
 462                 return(p_deflateInit_(strm,level,version,stream_size));
 463         else
 464                 return(Z_MEM_ERROR);
 465         }
 466
 467 #endif /* ZLIB_SHARED */