crypto/openssl-0.9/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 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                p_compress
 120 #define inflateEnd              p_inflateEnd
 121 #define inflate                 p_inflate
 122 #define inflateInit_            p_inflateInit_
 123 #define deflateEnd              p_deflateEnd
 124 #define deflate                 p_deflate
 125 #define deflateInit_            p_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 = zlib_zalloc;
 155         state->istream.zfree = zlib_zfree;
 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 = zlib_zalloc;
 167         state->ostream.zfree = zlib_zfree;
 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         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 #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
 377                         if (p_compress && p_inflateEnd && p_inflate
 378                                 && p_inflateInit_ && p_deflateEnd
 379                                 && p_deflate && p_deflateInit_)
 380                                 zlib_loaded++;
 381                         }
 382                 }
 383
 384 #endif
 385 #ifdef ZLIB_SHARED
 386         if (zlib_loaded)
 387 #endif
 388 #if defined(ZLIB) || defined(ZLIB_SHARED)
 389                 {
 390                 /* init zlib_stateful_ex_idx here so that in a multi-process
 391                  * application it's enough to intialize openssl before forking
 392                  * (idx will be inherited in all the children) */
 393                 if (zlib_stateful_ex_idx == -1)
 394                         {
 395                         CRYPTO_w_lock(CRYPTO_LOCK_COMP);
 396                         if (zlib_stateful_ex_idx == -1)
 397                                 zlib_stateful_ex_idx =
 398                                         CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_COMP,
 399                                                 0,NULL,NULL,NULL,zlib_stateful_free_ex_data);
 400                         CRYPTO_w_unlock(CRYPTO_LOCK_COMP);
 401                         if (zlib_stateful_ex_idx == -1)
 402                                 goto err;
 403                         }
 404
 405                 meth = &zlib_stateful_method;
 406                 }
 407 err:
 408 #endif
 409
 410         return(meth);
 411         }
 412