0f34597e70427cf45dd1fe4a6c7c3195e77fea4f
[openssl.git] / 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 typedef const char * (*zError__ft)(int err);
109 static compress_ft      p_compress=NULL;
110 static inflateEnd_ft    p_inflateEnd=NULL;
111 static inflate_ft       p_inflate=NULL;
112 static inflateInit__ft  p_inflateInit_=NULL;
113 static deflateEnd_ft    p_deflateEnd=NULL;
114 static deflate_ft       p_deflate=NULL;
115 static deflateInit__ft  p_deflateInit_=NULL;
116 static zError__ft       p_zError=NULL;
117
118 static int zlib_loaded = 0;     /* only attempt to init func pts once */
119 static DSO *zlib_dso = NULL;
120
121 #define compress                p_compress
122 #define inflateEnd              p_inflateEnd
123 #define inflate                 p_inflate
124 #define inflateInit_            p_inflateInit_
125 #define deflateEnd              p_deflateEnd
126 #define deflate                 p_deflate
127 #define deflateInit_            p_deflateInit_
128 #define zError                  p_zError
129 #endif /* ZLIB_SHARED */
130
131 struct zlib_state
132         {
133         z_stream istream;
134         z_stream ostream;
135         };
136
137 static int zlib_stateful_ex_idx = -1;
138
139 static void zlib_stateful_free_ex_data(void *obj, void *item,
140         CRYPTO_EX_DATA *ad, int ind,long argl, void *argp)
141         {
142         struct zlib_state *state = (struct zlib_state *)item;
143         inflateEnd(&state->istream);
144         deflateEnd(&state->ostream);
145         OPENSSL_free(state);
146         }
147
148 static int zlib_stateful_init(COMP_CTX *ctx)
149         {
150         int err;
151         struct zlib_state *state =
152                 (struct zlib_state *)OPENSSL_malloc(sizeof(struct zlib_state));
153
154         if (state == NULL)
155                 goto err;
156
157         state->istream.zalloc = zlib_zalloc;
158         state->istream.zfree = zlib_zfree;
159         state->istream.opaque = Z_NULL;
160         state->istream.next_in = Z_NULL;
161         state->istream.next_out = Z_NULL;
162         state->istream.avail_in = 0;
163         state->istream.avail_out = 0;
164         err = inflateInit_(&state->istream,
165                 ZLIB_VERSION, sizeof(z_stream));
166         if (err != Z_OK)
167                 goto err;
168
169         state->ostream.zalloc = zlib_zalloc;
170         state->ostream.zfree = zlib_zfree;
171         state->ostream.opaque = Z_NULL;
172         state->ostream.next_in = Z_NULL;
173         state->ostream.next_out = Z_NULL;
174         state->ostream.avail_in = 0;
175         state->ostream.avail_out = 0;
176         err = deflateInit_(&state->ostream,Z_DEFAULT_COMPRESSION,
177                 ZLIB_VERSION, sizeof(z_stream));
178         if (err != Z_OK)
179                 goto err;
180
181         CRYPTO_new_ex_data(CRYPTO_EX_INDEX_COMP,ctx,&ctx->ex_data);
182         CRYPTO_set_ex_data(&ctx->ex_data,zlib_stateful_ex_idx,state);
183         return 1;
184  err:
185         if (state) OPENSSL_free(state);
186         return 0;
187         }
188
189 static void zlib_stateful_finish(COMP_CTX *ctx)
190         {
191         CRYPTO_free_ex_data(CRYPTO_EX_INDEX_COMP,ctx,&ctx->ex_data);
192         }
193
194 static int zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out,
195         unsigned int olen, unsigned char *in, unsigned int ilen)
196         {
197         int err = Z_OK;
198         struct zlib_state *state =
199                 (struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
200                         zlib_stateful_ex_idx);
201
202         if (state == NULL)
203                 return -1;
204
205         state->ostream.next_in = in;
206         state->ostream.avail_in = ilen;
207         state->ostream.next_out = out;
208         state->ostream.avail_out = olen;
209         if (ilen > 0)
210                 err = deflate(&state->ostream, Z_SYNC_FLUSH);
211         if (err != Z_OK)
212                 return -1;
213 #ifdef DEBUG_ZLIB
214         fprintf(stderr,"compress(%4d)->%4d %s\n",
215                 ilen,olen - state->ostream.avail_out,
216                 (ilen != olen - state->ostream.avail_out)?"zlib":"clear");
217 #endif
218         return olen - state->ostream.avail_out;
219         }
220
221 static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
222         unsigned int olen, unsigned char *in, unsigned int ilen)
223         {
224         int err = Z_OK;
225
226         struct zlib_state *state =
227                 (struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
228                         zlib_stateful_ex_idx);
229
230         if (state == NULL)
231                 return 0;
232
233         state->istream.next_in = in;
234         state->istream.avail_in = ilen;
235         state->istream.next_out = out;
236         state->istream.avail_out = olen;
237         if (ilen > 0)
238                 err = inflate(&state->istream, Z_SYNC_FLUSH);
239         if (err != Z_OK)
240                 return -1;
241 #ifdef DEBUG_ZLIB
242         fprintf(stderr,"expand(%4d)->%4d %s\n",
243                 ilen,olen - state->istream.avail_out,
244                 (ilen != olen - state->istream.avail_out)?"zlib":"clear");
245 #endif
246         return olen - state->istream.avail_out;
247         }
248
249 #if 0
250 static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
251         unsigned int olen, unsigned char *in, unsigned int ilen)
252         {
253         unsigned long l;
254         int i;
255         int clear=1;
256
257         if (ilen > 128)
258                 {
259                 out[0]=1;
260                 l=olen-1;
261                 i=compress(&(out[1]),&l,in,(unsigned long)ilen);
262                 if (i != Z_OK)
263                         return(-1);
264                 if (ilen > l)
265                         {
266                         clear=0;
267                         l++;
268                         }
269                 }
270         if (clear)
271                 {
272                 out[0]=0;
273                 memcpy(&(out[1]),in,ilen);
274                 l=ilen+1;
275                 }
276 #ifdef DEBUG_ZLIB
277         fprintf(stderr,"compress(%4d)->%4d %s\n",
278                 ilen,(int)l,(clear)?"clear":"zlib");
279 #endif
280         return((int)l);
281         }
282
283 static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
284         unsigned int olen, unsigned char *in, unsigned int ilen)
285         {
286         unsigned long l;
287         int i;
288
289         if (in[0])
290                 {
291                 l=olen;
292                 i=zz_uncompress(out,&l,&(in[1]),(unsigned long)ilen-1);
293                 if (i != Z_OK)
294                         return(-1);
295                 }
296         else
297                 {
298                 memcpy(out,&(in[1]),ilen-1);
299                 l=ilen-1;
300                 }
301 #ifdef DEBUG_ZLIB
302         fprintf(stderr,"expand  (%4d)->%4d %s\n",
303                 ilen,(int)l,in[0]?"zlib":"clear");
304 #endif
305         return((int)l);
306         }
307
308 static int zz_uncompress (Bytef *dest, uLongf *destLen, const Bytef *source,
309              uLong sourceLen)
310 {
311     z_stream stream;
312     int err;
313
314     stream.next_in = (Bytef*)source;
315     stream.avail_in = (uInt)sourceLen;
316     /* Check for source > 64K on 16-bit machine: */
317     if ((uLong)stream.avail_in != sourceLen) return Z_BUF_ERROR;
318
319     stream.next_out = dest;
320     stream.avail_out = (uInt)*destLen;
321     if ((uLong)stream.avail_out != *destLen) return Z_BUF_ERROR;
322
323     stream.zalloc = (alloc_func)0;
324     stream.zfree = (free_func)0;
325
326     err = inflateInit_(&stream,
327             ZLIB_VERSION, sizeof(z_stream));
328     if (err != Z_OK) return err;
329
330     err = inflate(&stream, Z_FINISH);
331     if (err != Z_STREAM_END) {
332         inflateEnd(&stream);
333         return err;
334     }
335     *destLen = stream.total_out;
336
337     err = inflateEnd(&stream);
338     return err;
339 }
340 #endif
341
342 #endif
343
344 COMP_METHOD *COMP_zlib(void)
345         {
346         COMP_METHOD *meth = &zlib_method_nozlib;
347
348 #ifdef ZLIB_SHARED
349         if (!zlib_loaded)
350                 {
351 #if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
352                 zlib_dso = DSO_load(NULL, "ZLIB1", NULL, 0);
353 #else
354                 zlib_dso = DSO_load(NULL, "z", NULL, 0);
355 #endif
356                 if (zlib_dso != NULL)
357                         {
358                         p_compress
359                                 = (compress_ft) DSO_bind_func(zlib_dso,
360                                         "compress");
361                         p_inflateEnd
362                                 = (inflateEnd_ft) DSO_bind_func(zlib_dso,
363                                         "inflateEnd");
364                         p_inflate
365                                 = (inflate_ft) DSO_bind_func(zlib_dso,
366                                         "inflate");
367                         p_inflateInit_
368                                 = (inflateInit__ft) DSO_bind_func(zlib_dso,
369                                         "inflateInit_");
370                         p_deflateEnd
371                                 = (deflateEnd_ft) DSO_bind_func(zlib_dso,
372                                         "deflateEnd");
373                         p_deflate
374                                 = (deflate_ft) DSO_bind_func(zlib_dso,
375                                         "deflate");
376                         p_deflateInit_
377                                 = (deflateInit__ft) DSO_bind_func(zlib_dso,
378                                         "deflateInit_");
379                         p_zError
380                                 = (zError__ft) DSO_bind_func(zlib_dso,
381                                         "zError");
382
383                         if (p_compress && p_inflateEnd && p_inflate
384                                 && p_inflateInit_ && p_deflateEnd
385                                 && p_deflate && p_deflateInit_ && p_zError)
386                                 zlib_loaded++;
387                         }
388                 }
389
390 #endif
391 #ifdef ZLIB_SHARED
392         if (zlib_loaded)
393 #endif
394 #if defined(ZLIB) || defined(ZLIB_SHARED)
395                 {
396                 /* init zlib_stateful_ex_idx here so that in a multi-process
397                  * application it's enough to intialize openssl before forking
398                  * (idx will be inherited in all the children) */
399                 if (zlib_stateful_ex_idx == -1)
400                         {
401                         CRYPTO_w_lock(CRYPTO_LOCK_COMP);
402                         if (zlib_stateful_ex_idx == -1)
403                                 zlib_stateful_ex_idx =
404                                         CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_COMP,
405                                                 0,NULL,NULL,NULL,zlib_stateful_free_ex_data);
406                         CRYPTO_w_unlock(CRYPTO_LOCK_COMP);
407                         if (zlib_stateful_ex_idx == -1)
408                                 goto err;
409                         }
410                 
411                 meth = &zlib_stateful_method;
412                 }
413 err:    
414 #endif
415
416         return(meth);
417         }
418
419 void COMP_zlib_cleanup(void)
420         {
421 #ifdef ZLIB_SHARED
422         if (zlib_dso)
423                 DSO_free(zlib_dso);
424 #endif
425         }
426
427 #ifdef ZLIB
428
429 /* Zlib based compression/decompression filter BIO */
430
431 typedef struct
432         {
433         unsigned char *ibuf;    /* Input buffer */
434         int ibufsize;           /* Buffer size */
435         z_stream zin;           /* Input decompress context */
436         unsigned char *obuf;    /* Output buffer */
437         int obufsize;           /* Output buffer size */
438         unsigned char *optr;    /* Position in output buffer */
439         int ocount;             /* Amount of data in output buffer */
440         int odone;              /* deflate EOF */
441         int comp_level;         /* Compression level to use */
442         z_stream zout;          /* Output compression context */
443         } BIO_ZLIB_CTX;
444
445 #define ZLIB_DEFAULT_BUFSIZE 1024
446
447 static int bio_zlib_new(BIO *bi);
448 static int bio_zlib_free(BIO *bi);
449 static int bio_zlib_read(BIO *b, char *out, int outl);
450 static int bio_zlib_write(BIO *b, const char *in, int inl);
451 static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr);
452 static long bio_zlib_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp);
453
454 static BIO_METHOD bio_meth_zlib = 
455         {
456         BIO_TYPE_COMP,
457         "zlib",
458         bio_zlib_write,
459         bio_zlib_read,
460         NULL,
461         NULL,
462         bio_zlib_ctrl,
463         bio_zlib_new,
464         bio_zlib_free,
465         bio_zlib_callback_ctrl
466         };
467
468 BIO_METHOD *BIO_f_zlib(void)
469         {
470         return &bio_meth_zlib;
471         }
472
473
474 static int bio_zlib_new(BIO *bi)
475         {
476         BIO_ZLIB_CTX *ctx;
477 #ifdef ZLIB_SHARED
478         (void)COMP_zlib();
479         if (!zlib_loaded)
480                 {
481                 COMPerr(COMP_F_BIO_ZLIB_NEW, COMP_R_ZLIB_NOT_SUPPORTED);
482                 return 0;
483                 }
484 #endif
485         ctx = OPENSSL_malloc(sizeof(BIO_ZLIB_CTX));
486         if(!ctx)
487                 {
488                 COMPerr(COMP_F_BIO_ZLIB_NEW, ERR_R_MALLOC_FAILURE);
489                 return 0;
490                 }
491         ctx->ibuf = NULL;
492         ctx->obuf = NULL;
493         ctx->ibufsize = ZLIB_DEFAULT_BUFSIZE;
494         ctx->obufsize = ZLIB_DEFAULT_BUFSIZE;
495         ctx->zin.zalloc = Z_NULL;
496         ctx->zin.zfree = Z_NULL;
497         ctx->zin.next_in = NULL;
498         ctx->zin.avail_in = 0;
499         ctx->zin.next_out = NULL;
500         ctx->zin.avail_out = 0;
501         ctx->zout.zalloc = Z_NULL;
502         ctx->zout.zfree = Z_NULL;
503         ctx->zout.next_in = NULL;
504         ctx->zout.avail_in = 0;
505         ctx->zout.next_out = NULL;
506         ctx->zout.avail_out = 0;
507         ctx->odone = 0;
508         ctx->comp_level = Z_DEFAULT_COMPRESSION;
509         bi->init = 1;
510         bi->ptr = (char *)ctx;
511         bi->flags = 0;
512         return 1;
513         }
514
515 static int bio_zlib_free(BIO *bi)
516         {
517         BIO_ZLIB_CTX *ctx;
518         if(!bi) return 0;
519         ctx = (BIO_ZLIB_CTX *)bi->ptr;
520         if(ctx->ibuf)
521                 {
522                 /* Destroy decompress context */
523                 inflateEnd(&ctx->zin);
524                 OPENSSL_free(ctx->ibuf);
525                 }
526         if(ctx->obuf)
527                 {
528                 /* Destroy compress context */
529                 deflateEnd(&ctx->zout);
530                 OPENSSL_free(ctx->obuf);
531                 }
532         OPENSSL_free(ctx);
533         bi->ptr = NULL;
534         bi->init = 0;
535         bi->flags = 0;
536         return 1;
537         }
538
539 static int bio_zlib_read(BIO *b, char *out, int outl)
540         {
541         BIO_ZLIB_CTX *ctx;
542         int ret;
543         z_stream *zin;
544         if(!out || !outl) return 0;
545         ctx = (BIO_ZLIB_CTX *)b->ptr;
546         zin = &ctx->zin;
547         BIO_clear_retry_flags(b);
548         if(!ctx->ibuf)
549                 {
550                 ctx->ibuf = OPENSSL_malloc(ctx->ibufsize);
551                 if(!ctx->ibuf)
552                         {
553                         COMPerr(COMP_F_BIO_ZLIB_READ, ERR_R_MALLOC_FAILURE);
554                         return 0;
555                         }
556                 inflateInit(zin);
557                 zin->next_in = ctx->ibuf;
558                 zin->avail_in = 0;
559                 }
560
561         /* Copy output data directly to supplied buffer */
562         zin->next_out = (unsigned char *)out;
563         zin->avail_out = (unsigned int)outl;
564         for(;;)
565                 {
566                 /* Decompress while data available */
567                 while(zin->avail_in)
568                         {
569                         ret = inflate(zin, 0);
570                         if((ret != Z_OK) && (ret != Z_STREAM_END))
571                                 {
572                                 COMPerr(COMP_F_BIO_ZLIB_READ,
573                                                 COMP_R_ZLIB_INFLATE_ERROR);
574                                 ERR_add_error_data(2, "zlib error:",
575                                                         zError(ret));
576                                 return 0;
577                                 }
578                         /* If EOF or we've read everything then return */
579                         if((ret == Z_STREAM_END) || !zin->avail_out)
580                                 return outl - zin->avail_out;
581                         }
582
583                 /* No data in input buffer try to read some in,
584                  * if an error then return the total data read.
585                  */
586                 ret = BIO_read(b->next_bio, ctx->ibuf, ctx->ibufsize);
587                 if(ret <= 0)
588                         {
589                         /* Total data read */
590                         int tot = outl - zin->avail_out;
591                         BIO_copy_next_retry(b);
592                         if(ret < 0) return (tot > 0) ? tot : ret;
593                         return tot;
594                         }
595                 zin->avail_in = ret;
596                 zin->next_in = ctx->ibuf;
597                 }
598         }
599
600 static int bio_zlib_write(BIO *b, const char *in, int inl)
601         {
602         BIO_ZLIB_CTX *ctx;
603         int ret;
604         z_stream *zout;
605         if(!in || !inl) return 0;
606         ctx = (BIO_ZLIB_CTX *)b->ptr;
607         if(ctx->odone) return 0;
608         zout = &ctx->zout;
609         BIO_clear_retry_flags(b);
610         if(!ctx->obuf)
611                 {
612                 ctx->obuf = OPENSSL_malloc(ctx->obufsize);
613                 /* Need error here */
614                 if(!ctx->obuf)
615                         {
616                         COMPerr(COMP_F_BIO_ZLIB_WRITE, ERR_R_MALLOC_FAILURE);
617                         return 0;
618                         }
619                 ctx->optr = ctx->obuf;
620                 ctx->ocount = 0;
621                 deflateInit(zout, ctx->comp_level);
622                 zout->next_out = ctx->obuf;
623                 zout->avail_out = ctx->obufsize;
624                 }
625         /* Obtain input data directly from supplied buffer */
626         zout->next_in = (void *)in;
627         zout->avail_in = inl;
628         for(;;)
629                 {
630                 /* If data in output buffer write it first */
631                 while(ctx->ocount) {
632                         ret = BIO_write(b->next_bio, ctx->optr, ctx->ocount);
633                         if(ret <= 0)
634                                 {
635                                 /* Total data written */
636                                 int tot = inl - zout->avail_in;
637                                 BIO_copy_next_retry(b);
638                                 if(ret < 0) return (tot > 0) ? tot : ret;
639                                 return tot;
640                                 }
641                         ctx->optr += ret;
642                         ctx->ocount -= ret;
643                 }
644
645                 /* Have we consumed all supplied data? */
646                 if(!zout->avail_in)
647                         return inl;
648
649                 /* Compress some more */
650
651                 /* Reset buffer */
652                 ctx->optr = ctx->obuf;
653                 zout->next_out = ctx->obuf;
654                 zout->avail_out = ctx->obufsize;
655                 /* Compress some more */
656                 ret = deflate(zout, 0);
657                 if(ret != Z_OK)
658                         {
659                         COMPerr(COMP_F_BIO_ZLIB_WRITE,
660                                                 COMP_R_ZLIB_DEFLATE_ERROR);
661                         ERR_add_error_data(2, "zlib error:", zError(ret));
662                         return 0;
663                         }
664                 ctx->ocount = ctx->obufsize - zout->avail_out;
665                 }
666         }
667
668 static int bio_zlib_flush(BIO *b)
669         {
670         BIO_ZLIB_CTX *ctx;
671         int ret;
672         z_stream *zout;
673         ctx = (BIO_ZLIB_CTX *)b->ptr;
674         /* If no data written or already flush show success */
675         if(!ctx->obuf || (ctx->odone && !ctx->ocount)) return 1;
676         zout = &ctx->zout;
677         BIO_clear_retry_flags(b);
678         /* No more input data */
679         zout->next_in = NULL;
680         zout->avail_in = 0;
681         for(;;)
682                 {
683                 /* If data in output buffer write it first */
684                 while(ctx->ocount)
685                         {
686                         ret = BIO_write(b->next_bio, ctx->optr, ctx->ocount);
687                         if(ret <= 0)
688                                 {
689                                 BIO_copy_next_retry(b);
690                                 return ret;
691                                 }
692                         ctx->optr += ret;
693                         ctx->ocount -= ret;
694                         }
695                 if(ctx->odone) return 1;
696
697                 /* Compress some more */
698
699                 /* Reset buffer */
700                 ctx->optr = ctx->obuf;
701                 zout->next_out = ctx->obuf;
702                 zout->avail_out = ctx->obufsize;
703                 /* Compress some more */
704                 ret = deflate(zout, Z_FINISH);
705                 if(ret == Z_STREAM_END) ctx->odone = 1;
706                 else if(ret != Z_OK)
707                         {
708                         COMPerr(COMP_F_BIO_ZLIB_FLUSH,
709                                                 COMP_R_ZLIB_DEFLATE_ERROR);
710                         ERR_add_error_data(2, "zlib error:", zError(ret));
711                         return 0;
712                         }
713                 ctx->ocount = ctx->obufsize - zout->avail_out;
714                 }
715         }
716
717 static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr)
718         {
719         BIO_ZLIB_CTX *ctx;
720         int ret, *ip;
721         int ibs, obs;
722         if(!b->next_bio) return 0;
723         ctx = (BIO_ZLIB_CTX *)b->ptr;
724         switch (cmd)
725                 {
726
727         case BIO_CTRL_RESET:
728                 ctx->ocount = 0;
729                 ctx->odone = 0;
730                 break;
731
732         case BIO_CTRL_FLUSH:
733                 ret = bio_zlib_flush(b);
734                 if (ret > 0)
735                         ret = BIO_flush(b->next_bio);
736                 break;
737
738         case BIO_C_SET_BUFF_SIZE:
739                 ibs = -1;
740                 obs = -1;
741                 if (ptr != NULL)
742                         {
743                         ip = ptr;
744                         if (*ip == 0)
745                                 ibs = (int) num;
746                         else 
747                                 obs = (int) num;
748                         }
749                 else
750                         {
751                         ibs = (int)num;
752                         obs = ibs;
753                         }
754
755                 if (ibs != -1)
756                         {
757                         if (ctx->ibuf)
758                                 {
759                                 OPENSSL_free(ctx->ibuf);
760                                 ctx->ibuf = NULL;
761                                 }
762                         ctx->ibufsize = ibs;
763                         }
764
765                 if (obs != -1)
766                         {
767                         if (ctx->obuf)
768                                 {
769                                 OPENSSL_free(ctx->obuf);
770                                 ctx->obuf = NULL;
771                                 }
772                         ctx->obufsize = obs;
773                         }
774
775                 break;
776
777         case BIO_C_DO_STATE_MACHINE:
778                 BIO_clear_retry_flags(b);
779                 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
780                 BIO_copy_next_retry(b);
781                 break;
782
783         default:
784                 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
785                 break;
786
787                 }
788
789         return ret;
790         }
791
792
793 static long bio_zlib_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
794         {
795         if(!b->next_bio)
796                 return 0;
797         return
798                 BIO_callback_ctrl(b->next_bio, cmd, fp);
799         }
800
801 #endif