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 #if 0
  35 static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
  36         unsigned int olen, unsigned char *in, unsigned int ilen);
  37 static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
  38         unsigned int olen, unsigned char *in, unsigned int ilen);
  39
  40 static int zz_uncompress(Bytef *dest, uLongf *destLen, const Bytef *source,
  41         uLong sourceLen);
  42
  43 static COMP_METHOD zlib_stateless_method={
  44         NID_zlib_compression,
  45         LN_zlib_compression,
  46         NULL,
  47         NULL,
  48         zlib_compress_block,
  49         zlib_expand_block,
  50         NULL,
  51         NULL,
  52         };
  53 #endif
  54
  55 static COMP_METHOD zlib_stateful_method={
  56         NID_zlib_compression,
  57         LN_zlib_compression,
  58         zlib_stateful_init,
  59         zlib_stateful_finish,
  60         zlib_stateful_compress_block,
  61         zlib_stateful_expand_block,
  62         NULL,
  63         NULL,
  64         };
  65
  66 /*
  67  * When OpenSSL is built on Windows, we do not want to require that
  68  * the ZLIB.DLL be available in order for the OpenSSL DLLs to
  69  * work.  Therefore, all ZLIB routines are loaded at run time
  70  * and we do not link to a .LIB file when ZLIB_SHARED is set.
  71  */
  72 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
  73 # include <windows.h>
  74 #endif /* !(OPENSSL_SYS_WINDOWS || OPENSSL_SYS_WIN32) */
  75
  76 #ifdef ZLIB_SHARED
  77 #include <openssl/dso.h>
  78
  79 /* Function pointers */
  80 typedef int (*compress_ft)(Bytef *dest,uLongf *destLen,
  81         const Bytef *source, uLong sourceLen);
  82 typedef int (*inflateEnd_ft)(z_streamp strm);
  83 typedef int (*inflate_ft)(z_streamp strm, int flush);
  84 typedef int (*inflateInit__ft)(z_streamp strm,
  85         const char * version, int stream_size);
  86 typedef int (*deflateEnd_ft)(z_streamp strm);
  87 typedef int (*deflate_ft)(z_streamp strm, int flush);
  88 typedef int (*deflateInit__ft)(z_streamp strm, int level,
  89         const char * version, int stream_size);
  90 static compress_ft      p_compress=NULL;
  91 static inflateEnd_ft    p_inflateEnd=NULL;
  92 static inflate_ft       p_inflate=NULL;
  93 static inflateInit__ft  p_inflateInit_=NULL;
  94 static deflateEnd_ft    p_deflateEnd=NULL;
  95 static deflate_ft       p_deflate=NULL;
  96 static deflateInit__ft  p_deflateInit_=NULL;
  97
  98 static int zlib_loaded = 0;     /* only attempt to init func pts once */
  99 static DSO *zlib_dso = NULL;
 100
 101 #define compress                p_compress
 102 #define inflateEnd              p_inflateEnd
 103 #define inflate                 p_inflate
 104 #define inflateInit_            p_inflateInit_
 105 #define deflateEnd              p_deflateEnd
 106 #define deflate                 p_deflate
 107 #define deflateInit_            p_deflateInit_
 108 #endif /* ZLIB_SHARED */
 109
 110 struct zlib_state
 111         {
 112         z_stream istream;
 113         z_stream ostream;
 114         };
 115
 116 static int zlib_stateful_ex_idx = -1;
 117
 118 static void zlib_stateful_free_ex_data(void *obj, void *item,
 119         CRYPTO_EX_DATA *ad, int ind,long argl, void *argp)
 120         {
 121         struct zlib_state *state = (struct zlib_state *)item;
 122         inflateEnd(&state->istream);
 123         deflateEnd(&state->ostream);
 124         OPENSSL_free(state);
 125         }
 126
 127 static int zlib_stateful_init(COMP_CTX *ctx)
 128         {
 129         int err;
 130         struct zlib_state *state =
 131                 (struct zlib_state *)OPENSSL_malloc(sizeof(struct zlib_state));
 132
 133         if (state == NULL)
 134                 goto err;
 135
 136         state->istream.zalloc = Z_NULL;
 137         state->istream.zfree = Z_NULL;
 138         state->istream.opaque = Z_NULL;
 139         state->istream.next_in = Z_NULL;
 140         state->istream.next_out = Z_NULL;
 141         state->istream.avail_in = 0;
 142         state->istream.avail_out = 0;
 143         err = inflateInit_(&state->istream,
 144                 ZLIB_VERSION, sizeof(z_stream));
 145         if (err != Z_OK)
 146                 goto err;
 147
 148         state->ostream.zalloc = Z_NULL;
 149         state->ostream.zfree = Z_NULL;
 150         state->ostream.opaque = Z_NULL;
 151         state->ostream.next_in = Z_NULL;
 152         state->ostream.next_out = Z_NULL;
 153         state->ostream.avail_in = 0;
 154         state->ostream.avail_out = 0;
 155         err = deflateInit_(&state->ostream,Z_DEFAULT_COMPRESSION,
 156                 ZLIB_VERSION, sizeof(z_stream));
 157         if (err != Z_OK)
 158                 goto err;
 159
 160         CRYPTO_new_ex_data(CRYPTO_EX_INDEX_COMP,ctx,&ctx->ex_data);
 161         if (zlib_stateful_ex_idx == -1)
 162                 {
 163                 CRYPTO_w_lock(CRYPTO_LOCK_COMP);
 164                 if (zlib_stateful_ex_idx == -1)
 165                         zlib_stateful_ex_idx =
 166                                 CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_COMP,
 167                                         0,NULL,NULL,NULL,zlib_stateful_free_ex_data);
 168                 CRYPTO_w_unlock(CRYPTO_LOCK_COMP);
 169                 if (zlib_stateful_ex_idx == -1)
 170                         goto err;
 171                 }
 172         CRYPTO_set_ex_data(&ctx->ex_data,zlib_stateful_ex_idx,state);
 173         return 1;
 174  err:
 175         if (state) OPENSSL_free(state);
 176         return 0;
 177         }
 178
 179 static void zlib_stateful_finish(COMP_CTX *ctx)
 180         {
 181         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_COMP,ctx,&ctx->ex_data);
 182         }
 183
 184 static int zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out,
 185         unsigned int olen, unsigned char *in, unsigned int ilen)
 186         {
 187         int err = Z_OK;
 188         struct zlib_state *state =
 189                 (struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
 190                         zlib_stateful_ex_idx);
 191
 192         if (state == NULL)
 193                 return -1;
 194
 195         state->ostream.next_in = in;
 196         state->ostream.avail_in = ilen;
 197         state->ostream.next_out = out;
 198         state->ostream.avail_out = olen;
 199         if (ilen > 0)
 200                 err = deflate(&state->ostream, Z_SYNC_FLUSH);
 201         if (err != Z_OK)
 202                 return -1;
 203 #ifdef DEBUG_ZLIB
 204         fprintf(stderr,"compress(%4d)->%4d %s\n",
 205                 ilen,olen - state->ostream.avail_out,
 206                 (ilen != olen - state->ostream.avail_out)?"zlib":"clear");
 207 #endif
 208         return olen - state->ostream.avail_out;
 209         }
 210
 211 static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
 212         unsigned int olen, unsigned char *in, unsigned int ilen)
 213         {
 214         int err = Z_OK;
 215
 216         struct zlib_state *state =
 217                 (struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
 218                         zlib_stateful_ex_idx);
 219
 220         if (state == NULL)
 221                 return 0;
 222
 223         state->istream.next_in = in;
 224         state->istream.avail_in = ilen;
 225         state->istream.next_out = out;
 226         state->istream.avail_out = olen;
 227         if (ilen > 0)
 228                 err = inflate(&state->istream, Z_SYNC_FLUSH);
 229         if (err != Z_OK)
 230                 return -1;
 231 #ifdef DEBUG_ZLIB
 232         fprintf(stderr,"expand(%4d)->%4d %s\n",
 233                 ilen,olen - state->istream.avail_out,
 234                 (ilen != olen - state->istream.avail_out)?"zlib":"clear");
 235 #endif
 236         return olen - state->istream.avail_out;
 237         }
 238
 239 #if 0
 240 static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
 241         unsigned int olen, unsigned char *in, unsigned int ilen)
 242         {
 243         unsigned long l;
 244         int i;
 245         int clear=1;
 246
 247         if (ilen > 128)
 248                 {
 249                 out[0]=1;
 250                 l=olen-1;
 251                 i=compress(&(out[1]),&l,in,(unsigned long)ilen);
 252                 if (i != Z_OK)
 253                         return(-1);
 254                 if (ilen > l)
 255                         {
 256                         clear=0;
 257                         l++;
 258                         }
 259                 }
 260         if (clear)
 261                 {
 262                 out[0]=0;
 263                 memcpy(&(out[1]),in,ilen);
 264                 l=ilen+1;
 265                 }
 266 #ifdef DEBUG_ZLIB
 267         fprintf(stderr,"compress(%4d)->%4d %s\n",
 268                 ilen,(int)l,(clear)?"clear":"zlib");
 269 #endif
 270         return((int)l);
 271         }
 272
 273 static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
 274         unsigned int olen, unsigned char *in, unsigned int ilen)
 275         {
 276         unsigned long l;
 277         int i;
 278
 279         if (in[0])
 280                 {
 281                 l=olen;
 282                 i=zz_uncompress(out,&l,&(in[1]),(unsigned long)ilen-1);
 283                 if (i != Z_OK)
 284                         return(-1);
 285                 }
 286         else
 287                 {
 288                 memcpy(out,&(in[1]),ilen-1);
 289                 l=ilen-1;
 290                 }
 291 #ifdef DEBUG_ZLIB
 292         fprintf(stderr,"expand  (%4d)->%4d %s\n",
 293                 ilen,(int)l,in[0]?"zlib":"clear");
 294 #endif
 295         return((int)l);
 296         }
 297
 298 static int zz_uncompress (Bytef *dest, uLongf *destLen, const Bytef *source,
 299              uLong sourceLen)
 300 {
 301     z_stream stream;
 302     int err;
 303
 304     stream.next_in = (Bytef*)source;
 305     stream.avail_in = (uInt)sourceLen;
 306     /* Check for source > 64K on 16-bit machine: */
 307     if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
 308
 309     stream.next_out = dest;
 310     stream.avail_out = (uInt)*destLen;
 311     if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
 312
 313     stream.zalloc = (alloc_func)0;
 314     stream.zfree = (free_func)0;
 315
 316     err = inflateInit_(&stream,
 317             ZLIB_VERSION, sizeof(z_stream));
 318     if (err != Z_OK) return err;
 319
 320     err = inflate(&stream, Z_FINISH);
 321     if (err != Z_STREAM_END) {
 322         inflateEnd(&stream);
 323         return err;
 324     }
 325     *destLen = stream.total_out;
 326
 327     err = inflateEnd(&stream);
 328     return err;
 329 }
 330 #endif
 331
 332 #endif
 333
 334 COMP_METHOD *COMP_zlib(void)
 335         {
 336         COMP_METHOD *meth = &zlib_method_nozlib;
 337
 338 #ifdef ZLIB_SHARED
 339         if (!zlib_loaded)
 340                 {
 341 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
 342                 zlib_dso = DSO_load(NULL, "ZLIB1", NULL, 0);
 343 #else
 344                 zlib_dso = DSO_load(NULL, "z", NULL, 0);
 345 #endif
 346                 if (zlib_dso != NULL)
 347                         {
 348                         p_compress
 349                                 = (compress_ft) DSO_bind_func(zlib_dso,
 350                                         "compress");
 351                         p_inflateEnd
 352                                 = (inflateEnd_ft) DSO_bind_func(zlib_dso,
 353                                         "inflateEnd");
 354                         p_inflate
 355                                 = (inflate_ft) DSO_bind_func(zlib_dso,
 356                                         "inflate");
 357                         p_inflateInit_
 358                                 = (inflateInit__ft) DSO_bind_func(zlib_dso,
 359                                         "inflateInit_");
 360                         p_deflateEnd
 361                                 = (deflateEnd_ft) DSO_bind_func(zlib_dso,
 362                                         "deflateEnd");
 363                         p_deflate
 364                                 = (deflate_ft) DSO_bind_func(zlib_dso,
 365                                         "deflate");
 366                         p_deflateInit_
 367                                 = (deflateInit__ft) DSO_bind_func(zlib_dso,
 368                                         "deflateInit_");
 369
 370                         if (p_compress && p_inflateEnd && p_inflate
 371                                 && p_inflateInit_ && p_deflateEnd
 372                                 && p_deflate && p_deflateInit_)
 373                                 zlib_loaded++;
 374                         }
 375                 }
 376
 377 #endif
 378 #ifdef ZLIB_SHARED
 379         if (zlib_loaded)
 380 #endif
 381 #if defined(ZLIB) || defined(ZLIB_SHARED)
 382                 meth = &zlib_stateful_method;
 383 #endif
 384
 385         return(meth);
 386         }
 387