Remove all .cvsignore files
[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 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 = zlib_zalloc;
149         state->istream.zfree = zlib_zfree;
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                 ZLIB_VERSION, sizeof(z_stream));
157         if (err != Z_OK)
158                 goto err;
159
160         state->ostream.zalloc = zlib_zalloc;
161         state->ostream.zfree = zlib_zfree;
162         state->ostream.opaque = Z_NULL;
163         state->ostream.next_in = Z_NULL;
164         state->ostream.next_out = Z_NULL;
165         state->ostream.avail_in = 0;
166         state->ostream.avail_out = 0;
167         err = deflateInit_(&state->ostream,Z_DEFAULT_COMPRESSION,
168                 ZLIB_VERSION, sizeof(z_stream));
169         if (err != Z_OK)
170                 goto err;
171
172         CRYPTO_new_ex_data(CRYPTO_EX_INDEX_COMP,ctx,&ctx->ex_data);
173         CRYPTO_set_ex_data(&ctx->ex_data,zlib_stateful_ex_idx,state);
174         return 1;
175  err:
176         if (state) OPENSSL_free(state);
177         return 0;
178         }
179
180 static void zlib_stateful_finish(COMP_CTX *ctx)
181         {
182         struct zlib_state *state =
183                 (struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
184                         zlib_stateful_ex_idx);
185         inflateEnd(&state->istream);
186         deflateEnd(&state->ostream);
187         OPENSSL_free(state);
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                         p_zError
377                                 = (zError__ft) DSO_bind_func(zlib_dso,
378                                         "zError");
379
380                         if (p_compress && p_inflateEnd && p_inflate
381                                 && p_inflateInit_ && p_deflateEnd
382                                 && p_deflate && p_deflateInit_ && p_zError)
383                                 zlib_loaded++;
384                         }
385                 }
386
387 #endif
388 #ifdef ZLIB_SHARED
389         if (zlib_loaded)
390 #endif
391 #if defined(ZLIB) || defined(ZLIB_SHARED)
392                 {
393                 /* init zlib_stateful_ex_idx here so that in a multi-process
394                  * application it's enough to intialize openssl before forking
395                  * (idx will be inherited in all the children) */
396                 if (zlib_stateful_ex_idx == -1)
397                         {
398                         CRYPTO_w_lock(CRYPTO_LOCK_COMP);
399                         if (zlib_stateful_ex_idx == -1)
400                                 zlib_stateful_ex_idx =
401                                         CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_COMP,
402                                                 0,NULL,NULL,NULL,NULL);
403                         CRYPTO_w_unlock(CRYPTO_LOCK_COMP);
404                         if (zlib_stateful_ex_idx == -1)
405                                 goto err;
406                         }
407                 
408                 meth = &zlib_stateful_method;
409                 }
410 err:    
411 #endif
412
413         return(meth);
414         }
415
416 void COMP_zlib_cleanup(void)
417         {
418 #ifdef ZLIB_SHARED
419         if (zlib_dso)
420                 DSO_free(zlib_dso);
421 #endif
422         }
423
424 #ifdef ZLIB
425
426 /* Zlib based compression/decompression filter BIO */
427
428 typedef struct
429         {
430         unsigned char *ibuf;    /* Input buffer */
431         int ibufsize;           /* Buffer size */
432         z_stream zin;           /* Input decompress context */
433         unsigned char *obuf;    /* Output buffer */
434         int obufsize;           /* Output buffer size */
435         unsigned char *optr;    /* Position in output buffer */
436         int ocount;             /* Amount of data in output buffer */
437         int odone;              /* deflate EOF */
438         int comp_level;         /* Compression level to use */
439         z_stream zout;          /* Output compression context */
440         } BIO_ZLIB_CTX;
441
442 #define ZLIB_DEFAULT_BUFSIZE 1024
443
444 static int bio_zlib_new(BIO *bi);
445 static int bio_zlib_free(BIO *bi);
446 static int bio_zlib_read(BIO *b, char *out, int outl);
447 static int bio_zlib_write(BIO *b, const char *in, int inl);
448 static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr);
449 static long bio_zlib_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp);
450
451 static BIO_METHOD bio_meth_zlib = 
452         {
453         BIO_TYPE_COMP,
454         "zlib",
455         bio_zlib_write,
456         bio_zlib_read,
457         NULL,
458         NULL,
459         bio_zlib_ctrl,
460         bio_zlib_new,
461         bio_zlib_free,
462         bio_zlib_callback_ctrl
463         };
464
465 BIO_METHOD *BIO_f_zlib(void)
466         {
467         return &bio_meth_zlib;
468         }
469
470
471 static int bio_zlib_new(BIO *bi)
472         {
473         BIO_ZLIB_CTX *ctx;
474 #ifdef ZLIB_SHARED
475         (void)COMP_zlib();
476         if (!zlib_loaded)
477                 {
478                 COMPerr(COMP_F_BIO_ZLIB_NEW, COMP_R_ZLIB_NOT_SUPPORTED);
479                 return 0;
480                 }
481 #endif
482         ctx = OPENSSL_malloc(sizeof(BIO_ZLIB_CTX));
483         if(!ctx)
484                 {
485                 COMPerr(COMP_F_BIO_ZLIB_NEW, ERR_R_MALLOC_FAILURE);
486                 return 0;
487                 }
488         ctx->ibuf = NULL;
489         ctx->obuf = NULL;
490         ctx->ibufsize = ZLIB_DEFAULT_BUFSIZE;
491         ctx->obufsize = ZLIB_DEFAULT_BUFSIZE;
492         ctx->zin.zalloc = Z_NULL;
493         ctx->zin.zfree = Z_NULL;
494         ctx->zin.next_in = NULL;
495         ctx->zin.avail_in = 0;
496         ctx->zin.next_out = NULL;
497         ctx->zin.avail_out = 0;
498         ctx->zout.zalloc = Z_NULL;
499         ctx->zout.zfree = Z_NULL;
500         ctx->zout.next_in = NULL;
501         ctx->zout.avail_in = 0;
502         ctx->zout.next_out = NULL;
503         ctx->zout.avail_out = 0;
504         ctx->odone = 0;
505         ctx->comp_level = Z_DEFAULT_COMPRESSION;
506         bi->init = 1;
507         bi->ptr = (char *)ctx;
508         bi->flags = 0;
509         return 1;
510         }
511
512 static int bio_zlib_free(BIO *bi)
513         {
514         BIO_ZLIB_CTX *ctx;
515         if(!bi) return 0;
516         ctx = (BIO_ZLIB_CTX *)bi->ptr;
517         if(ctx->ibuf)
518                 {
519                 /* Destroy decompress context */
520                 inflateEnd(&ctx->zin);
521                 OPENSSL_free(ctx->ibuf);
522                 }
523         if(ctx->obuf)
524                 {
525                 /* Destroy compress context */
526                 deflateEnd(&ctx->zout);
527                 OPENSSL_free(ctx->obuf);
528                 }
529         OPENSSL_free(ctx);
530         bi->ptr = NULL;
531         bi->init = 0;
532         bi->flags = 0;
533         return 1;
534         }
535
536 static int bio_zlib_read(BIO *b, char *out, int outl)
537         {
538         BIO_ZLIB_CTX *ctx;
539         int ret;
540         z_stream *zin;
541         if(!out || !outl) return 0;
542         ctx = (BIO_ZLIB_CTX *)b->ptr;
543         zin = &ctx->zin;
544         BIO_clear_retry_flags(b);
545         if(!ctx->ibuf)
546                 {
547                 ctx->ibuf = OPENSSL_malloc(ctx->ibufsize);
548                 if(!ctx->ibuf)
549                         {
550                         COMPerr(COMP_F_BIO_ZLIB_READ, ERR_R_MALLOC_FAILURE);
551                         return 0;
552                         }
553                 inflateInit(zin);
554                 zin->next_in = ctx->ibuf;
555                 zin->avail_in = 0;
556                 }
557
558         /* Copy output data directly to supplied buffer */
559         zin->next_out = (unsigned char *)out;
560         zin->avail_out = (unsigned int)outl;
561         for(;;)
562                 {
563                 /* Decompress while data available */
564                 while(zin->avail_in)
565                         {
566                         ret = inflate(zin, 0);
567                         if((ret != Z_OK) && (ret != Z_STREAM_END))
568                                 {
569                                 COMPerr(COMP_F_BIO_ZLIB_READ,
570                                                 COMP_R_ZLIB_INFLATE_ERROR);
571                                 ERR_add_error_data(2, "zlib error:",
572                                                         zError(ret));
573                                 return 0;
574                                 }
575                         /* If EOF or we've read everything then return */
576                         if((ret == Z_STREAM_END) || !zin->avail_out)
577                                 return outl - zin->avail_out;
578                         }
579
580                 /* No data in input buffer try to read some in,
581                  * if an error then return the total data read.
582                  */
583                 ret = BIO_read(b->next_bio, ctx->ibuf, ctx->ibufsize);
584                 if(ret <= 0)
585                         {
586                         /* Total data read */
587                         int tot = outl - zin->avail_out;
588                         BIO_copy_next_retry(b);
589                         if(ret < 0) return (tot > 0) ? tot : ret;
590                         return tot;
591                         }
592                 zin->avail_in = ret;
593                 zin->next_in = ctx->ibuf;
594                 }
595         }
596
597 static int bio_zlib_write(BIO *b, const char *in, int inl)
598         {
599         BIO_ZLIB_CTX *ctx;
600         int ret;
601         z_stream *zout;
602         if(!in || !inl) return 0;
603         ctx = (BIO_ZLIB_CTX *)b->ptr;
604         if(ctx->odone) return 0;
605         zout = &ctx->zout;
606         BIO_clear_retry_flags(b);
607         if(!ctx->obuf)
608                 {
609                 ctx->obuf = OPENSSL_malloc(ctx->obufsize);
610                 /* Need error here */
611                 if(!ctx->obuf)
612                         {
613                         COMPerr(COMP_F_BIO_ZLIB_WRITE, ERR_R_MALLOC_FAILURE);
614                         return 0;
615                         }
616                 ctx->optr = ctx->obuf;
617                 ctx->ocount = 0;
618                 deflateInit(zout, ctx->comp_level);
619                 zout->next_out = ctx->obuf;
620                 zout->avail_out = ctx->obufsize;
621                 }
622         /* Obtain input data directly from supplied buffer */
623         zout->next_in = (void *)in;
624         zout->avail_in = inl;
625         for(;;)
626                 {
627                 /* If data in output buffer write it first */
628                 while(ctx->ocount) {
629                         ret = BIO_write(b->next_bio, ctx->optr, ctx->ocount);
630                         if(ret <= 0)
631                                 {
632                                 /* Total data written */
633                                 int tot = inl - zout->avail_in;
634                                 BIO_copy_next_retry(b);
635                                 if(ret < 0) return (tot > 0) ? tot : ret;
636                                 return tot;
637                                 }
638                         ctx->optr += ret;
639                         ctx->ocount -= ret;
640                 }
641
642                 /* Have we consumed all supplied data? */
643                 if(!zout->avail_in)
644                         return inl;
645
646                 /* Compress some more */
647
648                 /* Reset buffer */
649                 ctx->optr = ctx->obuf;
650                 zout->next_out = ctx->obuf;
651                 zout->avail_out = ctx->obufsize;
652                 /* Compress some more */
653                 ret = deflate(zout, 0);
654                 if(ret != Z_OK)
655                         {
656                         COMPerr(COMP_F_BIO_ZLIB_WRITE,
657                                                 COMP_R_ZLIB_DEFLATE_ERROR);
658                         ERR_add_error_data(2, "zlib error:", zError(ret));
659                         return 0;
660                         }
661                 ctx->ocount = ctx->obufsize - zout->avail_out;
662                 }
663         }
664
665 static int bio_zlib_flush(BIO *b)
666         {
667         BIO_ZLIB_CTX *ctx;
668         int ret;
669         z_stream *zout;
670         ctx = (BIO_ZLIB_CTX *)b->ptr;
671         /* If no data written or already flush show success */
672         if(!ctx->obuf || (ctx->odone && !ctx->ocount)) return 1;
673         zout = &ctx->zout;
674         BIO_clear_retry_flags(b);
675         /* No more input data */
676         zout->next_in = NULL;
677         zout->avail_in = 0;
678         for(;;)
679                 {
680                 /* If data in output buffer write it first */
681                 while(ctx->ocount)
682                         {
683                         ret = BIO_write(b->next_bio, ctx->optr, ctx->ocount);
684                         if(ret <= 0)
685                                 {
686                                 BIO_copy_next_retry(b);
687                                 return ret;
688                                 }
689                         ctx->optr += ret;
690                         ctx->ocount -= ret;
691                         }
692                 if(ctx->odone) return 1;
693
694                 /* Compress some more */
695
696                 /* Reset buffer */
697                 ctx->optr = ctx->obuf;
698                 zout->next_out = ctx->obuf;
699                 zout->avail_out = ctx->obufsize;
700                 /* Compress some more */
701                 ret = deflate(zout, Z_FINISH);
702                 if(ret == Z_STREAM_END) ctx->odone = 1;
703                 else if(ret != Z_OK)
704                         {
705                         COMPerr(COMP_F_BIO_ZLIB_FLUSH,
706                                                 COMP_R_ZLIB_DEFLATE_ERROR);
707                         ERR_add_error_data(2, "zlib error:", zError(ret));
708                         return 0;
709                         }
710                 ctx->ocount = ctx->obufsize - zout->avail_out;
711                 }
712         }
713
714 static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr)
715         {
716         BIO_ZLIB_CTX *ctx;
717         int ret, *ip;
718         int ibs, obs;
719         if(!b->next_bio) return 0;
720         ctx = (BIO_ZLIB_CTX *)b->ptr;
721         switch (cmd)
722                 {
723
724         case BIO_CTRL_RESET:
725                 ctx->ocount = 0;
726                 ctx->odone = 0;
727                 ret = 1;
728                 break;
729
730         case BIO_CTRL_FLUSH:
731                 ret = bio_zlib_flush(b);
732                 if (ret > 0)
733                         ret = BIO_flush(b->next_bio);
734                 break;
735
736         case BIO_C_SET_BUFF_SIZE:
737                 ibs = -1;
738                 obs = -1;
739                 if (ptr != NULL)
740                         {
741                         ip = ptr;
742                         if (*ip == 0)
743                                 ibs = (int) num;
744                         else 
745                                 obs = (int) num;
746                         }
747                 else
748                         {
749                         ibs = (int)num;
750                         obs = ibs;
751                         }
752
753                 if (ibs != -1)
754                         {
755                         if (ctx->ibuf)
756                                 {
757                                 OPENSSL_free(ctx->ibuf);
758                                 ctx->ibuf = NULL;
759                                 }
760                         ctx->ibufsize = ibs;
761                         }
762
763                 if (obs != -1)
764                         {
765                         if (ctx->obuf)
766                                 {
767                                 OPENSSL_free(ctx->obuf);
768                                 ctx->obuf = NULL;
769                                 }
770                         ctx->obufsize = obs;
771                         }
772                 ret = 1;
773                 break;
774
775         case BIO_C_DO_STATE_MACHINE:
776                 BIO_clear_retry_flags(b);
777                 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
778                 BIO_copy_next_retry(b);
779                 break;
780
781         default:
782                 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
783                 break;
784
785                 }
786
787         return ret;
788         }
789
790
791 static long bio_zlib_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
792         {
793         if(!b->next_bio)
794                 return 0;
795         return
796                 BIO_callback_ctrl(b->next_bio, cmd, fp);
797         }
798
799 #endif