Line data Source code
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,
31 : unsigned int ilen);
32 : static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
33 : unsigned int olen, unsigned char *in,
34 : unsigned int ilen);
35 :
36 : /* memory allocations functions for zlib intialization */
37 : static void *zlib_zalloc(void *opaque, unsigned int no, unsigned int size)
38 : {
39 : void *p;
40 :
41 : p = OPENSSL_malloc(no * size);
42 : if (p)
43 : memset(p, 0, no * size);
44 : return p;
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,
55 : unsigned int ilen);
56 : static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
57 : unsigned int olen, unsigned char *in,
58 : unsigned int ilen);
59 :
60 : static int zz_uncompress(Bytef *dest, uLongf * destLen, const Bytef *source,
61 : uLong sourceLen);
62 :
63 : static COMP_METHOD zlib_stateless_method = {
64 : NID_zlib_compression,
65 : LN_zlib_compression,
66 : NULL,
67 : NULL,
68 : zlib_compress_block,
69 : zlib_expand_block,
70 : NULL,
71 : NULL,
72 : };
73 : # endif
74 :
75 : static COMP_METHOD zlib_stateful_method = {
76 : NID_zlib_compression,
77 : LN_zlib_compression,
78 : zlib_stateful_init,
79 : zlib_stateful_finish,
80 : zlib_stateful_compress_block,
81 : zlib_stateful_expand_block,
82 : NULL,
83 : NULL,
84 : };
85 :
86 : /*
87 : * When OpenSSL is built on Windows, we do not want to require that
88 : * the ZLIB.DLL be available in order for the OpenSSL DLLs to
89 : * work. Therefore, all ZLIB routines are loaded at run time
90 : * and we do not link to a .LIB file when ZLIB_SHARED is set.
91 : */
92 : # if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
93 : # include <windows.h>
94 : # endif /* !(OPENSSL_SYS_WINDOWS ||
95 : * OPENSSL_SYS_WIN32) */
96 :
97 : # ifdef ZLIB_SHARED
98 : # include <openssl/dso.h>
99 :
100 : /* Function pointers */
101 : typedef int (*compress_ft) (Bytef *dest, uLongf * destLen,
102 : const Bytef *source, uLong sourceLen);
103 : typedef int (*inflateEnd_ft) (z_streamp strm);
104 : typedef int (*inflate_ft) (z_streamp strm, int flush);
105 : typedef int (*inflateInit__ft) (z_streamp strm,
106 : const char *version, int stream_size);
107 : typedef int (*deflateEnd_ft) (z_streamp strm);
108 : typedef int (*deflate_ft) (z_streamp strm, int flush);
109 : typedef int (*deflateInit__ft) (z_streamp strm, int level,
110 : const char *version, int stream_size);
111 : typedef const char *(*zError__ft) (int err);
112 : static compress_ft p_compress = NULL;
113 : static inflateEnd_ft p_inflateEnd = NULL;
114 : static inflate_ft p_inflate = NULL;
115 : static inflateInit__ft p_inflateInit_ = NULL;
116 : static deflateEnd_ft p_deflateEnd = NULL;
117 : static deflate_ft p_deflate = NULL;
118 : static deflateInit__ft p_deflateInit_ = NULL;
119 : static zError__ft p_zError = NULL;
120 :
121 : static int zlib_loaded = 0; /* only attempt to init func pts once */
122 : static DSO *zlib_dso = NULL;
123 :
124 : # define compress p_compress
125 : # define inflateEnd p_inflateEnd
126 : # define inflate p_inflate
127 : # define inflateInit_ p_inflateInit_
128 : # define deflateEnd p_deflateEnd
129 : # define deflate p_deflate
130 : # define deflateInit_ p_deflateInit_
131 : # define zError p_zError
132 : # endif /* ZLIB_SHARED */
133 :
134 : struct zlib_state {
135 : z_stream istream;
136 : z_stream ostream;
137 : };
138 :
139 : static int zlib_stateful_ex_idx = -1;
140 :
141 : static int zlib_stateful_init(COMP_CTX *ctx)
142 : {
143 : int err;
144 : struct zlib_state *state =
145 : (struct zlib_state *)OPENSSL_malloc(sizeof(struct zlib_state));
146 :
147 : if (state == NULL)
148 : goto err;
149 :
150 : state->istream.zalloc = zlib_zalloc;
151 : state->istream.zfree = zlib_zfree;
152 : state->istream.opaque = Z_NULL;
153 : state->istream.next_in = Z_NULL;
154 : state->istream.next_out = Z_NULL;
155 : state->istream.avail_in = 0;
156 : state->istream.avail_out = 0;
157 : err = inflateInit_(&state->istream, ZLIB_VERSION, sizeof(z_stream));
158 : if (err != Z_OK)
159 : goto err;
160 :
161 : state->ostream.zalloc = zlib_zalloc;
162 : state->ostream.zfree = zlib_zfree;
163 : state->ostream.opaque = Z_NULL;
164 : state->ostream.next_in = Z_NULL;
165 : state->ostream.next_out = Z_NULL;
166 : state->ostream.avail_in = 0;
167 : state->ostream.avail_out = 0;
168 : err = deflateInit_(&state->ostream, Z_DEFAULT_COMPRESSION,
169 : ZLIB_VERSION, sizeof(z_stream));
170 : if (err != Z_OK)
171 : goto err;
172 :
173 : CRYPTO_new_ex_data(CRYPTO_EX_INDEX_COMP, ctx, &ctx->ex_data);
174 : CRYPTO_set_ex_data(&ctx->ex_data, zlib_stateful_ex_idx, state);
175 : return 1;
176 : err:
177 : if (state)
178 : OPENSSL_free(state);
179 : return 0;
180 : }
181 :
182 : static void zlib_stateful_finish(COMP_CTX *ctx)
183 : {
184 : struct zlib_state *state =
185 : (struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
186 : zlib_stateful_ex_idx);
187 : inflateEnd(&state->istream);
188 : deflateEnd(&state->ostream);
189 : OPENSSL_free(state);
190 : CRYPTO_free_ex_data(CRYPTO_EX_INDEX_COMP, ctx, &ctx->ex_data);
191 : }
192 :
193 : static int zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out,
194 : unsigned int olen, unsigned char *in,
195 : 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,
223 : unsigned int ilen)
224 : {
225 : int err = Z_OK;
226 :
227 : struct zlib_state *state =
228 : (struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
229 : zlib_stateful_ex_idx);
230 :
231 : if (state == NULL)
232 : return 0;
233 :
234 : state->istream.next_in = in;
235 : state->istream.avail_in = ilen;
236 : state->istream.next_out = out;
237 : state->istream.avail_out = olen;
238 : if (ilen > 0)
239 : err = inflate(&state->istream, Z_SYNC_FLUSH);
240 : if (err != Z_OK)
241 : return -1;
242 : # ifdef DEBUG_ZLIB
243 : fprintf(stderr, "expand(%4d)->%4d %s\n",
244 : ilen, olen - state->istream.avail_out,
245 : (ilen != olen - state->istream.avail_out) ? "zlib" : "clear");
246 : # endif
247 : return olen - state->istream.avail_out;
248 : }
249 :
250 : # if 0
251 : static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
252 : unsigned int olen, unsigned char *in,
253 : unsigned int ilen)
254 : {
255 : unsigned long l;
256 : int i;
257 : int clear = 1;
258 :
259 : if (ilen > 128) {
260 : out[0] = 1;
261 : l = olen - 1;
262 : i = compress(&(out[1]), &l, in, (unsigned long)ilen);
263 : if (i != Z_OK)
264 : return (-1);
265 : if (ilen > l) {
266 : clear = 0;
267 : l++;
268 : }
269 : }
270 : if (clear) {
271 : out[0] = 0;
272 : memcpy(&(out[1]), in, ilen);
273 : l = ilen + 1;
274 : }
275 : # ifdef DEBUG_ZLIB
276 : fprintf(stderr, "compress(%4d)->%4d %s\n",
277 : ilen, (int)l, (clear) ? "clear" : "zlib");
278 : # endif
279 : return ((int)l);
280 : }
281 :
282 : static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
283 : unsigned int olen, unsigned char *in,
284 : unsigned int ilen)
285 : {
286 : unsigned long l;
287 : int i;
288 :
289 : if (in[0]) {
290 : l = olen;
291 : i = zz_uncompress(out, &l, &(in[1]), (unsigned long)ilen - 1);
292 : if (i != Z_OK)
293 : return (-1);
294 : } else {
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)
315 : return Z_BUF_ERROR;
316 :
317 : stream.next_out = dest;
318 : stream.avail_out = (uInt) * destLen;
319 : if ((uLong) stream.avail_out != *destLen)
320 : return Z_BUF_ERROR;
321 :
322 : stream.zalloc = (alloc_func) 0;
323 : stream.zfree = (free_func) 0;
324 :
325 : err = inflateInit_(&stream, ZLIB_VERSION, sizeof(z_stream));
326 : if (err != Z_OK)
327 : return err;
328 :
329 : err = inflate(&stream, Z_FINISH);
330 : if (err != Z_STREAM_END) {
331 : inflateEnd(&stream);
332 : return err;
333 : }
334 : *destLen = stream.total_out;
335 :
336 : err = inflateEnd(&stream);
337 : return err;
338 : }
339 : # endif
340 :
341 : #endif
342 :
343 121 : COMP_METHOD *COMP_zlib(void)
344 : {
345 : COMP_METHOD *meth = &zlib_method_nozlib;
346 :
347 : #ifdef ZLIB_SHARED
348 : if (!zlib_loaded) {
349 : # if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
350 : zlib_dso = DSO_load(NULL, "ZLIB1", NULL, 0);
351 : # else
352 : zlib_dso = DSO_load(NULL, "z", NULL, 0);
353 : # endif
354 : if (zlib_dso != NULL) {
355 : p_compress = (compress_ft) DSO_bind_func(zlib_dso, "compress");
356 : p_inflateEnd
357 : = (inflateEnd_ft) DSO_bind_func(zlib_dso, "inflateEnd");
358 : p_inflate = (inflate_ft) DSO_bind_func(zlib_dso, "inflate");
359 : p_inflateInit_
360 : = (inflateInit__ft) DSO_bind_func(zlib_dso, "inflateInit_");
361 : p_deflateEnd
362 : = (deflateEnd_ft) DSO_bind_func(zlib_dso, "deflateEnd");
363 : p_deflate = (deflate_ft) DSO_bind_func(zlib_dso, "deflate");
364 : p_deflateInit_
365 : = (deflateInit__ft) DSO_bind_func(zlib_dso, "deflateInit_");
366 : p_zError = (zError__ft) DSO_bind_func(zlib_dso, "zError");
367 :
368 : if (p_compress && p_inflateEnd && p_inflate
369 : && p_inflateInit_ && p_deflateEnd
370 : && p_deflate && p_deflateInit_ && p_zError)
371 : zlib_loaded++;
372 : }
373 : }
374 : #endif
375 : #ifdef ZLIB_SHARED
376 : if (zlib_loaded)
377 : #endif
378 : #if defined(ZLIB) || defined(ZLIB_SHARED)
379 : {
380 : /*
381 : * init zlib_stateful_ex_idx here so that in a multi-process
382 : * application it's enough to intialize openssl before forking (idx
383 : * will be inherited in all the children)
384 : */
385 : if (zlib_stateful_ex_idx == -1) {
386 : CRYPTO_w_lock(CRYPTO_LOCK_COMP);
387 : if (zlib_stateful_ex_idx == -1)
388 : zlib_stateful_ex_idx =
389 : CRYPTO_get_ex_new_index(CRYPTO_EX_INDEX_COMP,
390 : 0, NULL, NULL, NULL, NULL);
391 : CRYPTO_w_unlock(CRYPTO_LOCK_COMP);
392 : if (zlib_stateful_ex_idx == -1)
393 : goto err;
394 : }
395 :
396 : meth = &zlib_stateful_method;
397 : }
398 : err:
399 : #endif
400 :
401 121 : return (meth);
402 : }
403 :
404 0 : void COMP_zlib_cleanup(void)
405 : {
406 : #ifdef ZLIB_SHARED
407 : if (zlib_dso)
408 : DSO_free(zlib_dso);
409 : #endif
410 0 : }
411 :
412 : #ifdef ZLIB
413 :
414 : /* Zlib based compression/decompression filter BIO */
415 :
416 : typedef struct {
417 : unsigned char *ibuf; /* Input buffer */
418 : int ibufsize; /* Buffer size */
419 : z_stream zin; /* Input decompress context */
420 : unsigned char *obuf; /* Output buffer */
421 : int obufsize; /* Output buffer size */
422 : unsigned char *optr; /* Position in output buffer */
423 : int ocount; /* Amount of data in output buffer */
424 : int odone; /* deflate EOF */
425 : int comp_level; /* Compression level to use */
426 : z_stream zout; /* Output compression context */
427 : } BIO_ZLIB_CTX;
428 :
429 : # define ZLIB_DEFAULT_BUFSIZE 1024
430 :
431 : static int bio_zlib_new(BIO *bi);
432 : static int bio_zlib_free(BIO *bi);
433 : static int bio_zlib_read(BIO *b, char *out, int outl);
434 : static int bio_zlib_write(BIO *b, const char *in, int inl);
435 : static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr);
436 : static long bio_zlib_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp);
437 :
438 : static BIO_METHOD bio_meth_zlib = {
439 : BIO_TYPE_COMP,
440 : "zlib",
441 : bio_zlib_write,
442 : bio_zlib_read,
443 : NULL,
444 : NULL,
445 : bio_zlib_ctrl,
446 : bio_zlib_new,
447 : bio_zlib_free,
448 : bio_zlib_callback_ctrl
449 : };
450 :
451 : BIO_METHOD *BIO_f_zlib(void)
452 : {
453 : return &bio_meth_zlib;
454 : }
455 :
456 : static int bio_zlib_new(BIO *bi)
457 : {
458 : BIO_ZLIB_CTX *ctx;
459 : # ifdef ZLIB_SHARED
460 : (void)COMP_zlib();
461 : if (!zlib_loaded) {
462 : COMPerr(COMP_F_BIO_ZLIB_NEW, COMP_R_ZLIB_NOT_SUPPORTED);
463 : return 0;
464 : }
465 : # endif
466 : ctx = OPENSSL_malloc(sizeof(BIO_ZLIB_CTX));
467 : if (!ctx) {
468 : COMPerr(COMP_F_BIO_ZLIB_NEW, ERR_R_MALLOC_FAILURE);
469 : return 0;
470 : }
471 : ctx->ibuf = NULL;
472 : ctx->obuf = NULL;
473 : ctx->ibufsize = ZLIB_DEFAULT_BUFSIZE;
474 : ctx->obufsize = ZLIB_DEFAULT_BUFSIZE;
475 : ctx->zin.zalloc = Z_NULL;
476 : ctx->zin.zfree = Z_NULL;
477 : ctx->zin.next_in = NULL;
478 : ctx->zin.avail_in = 0;
479 : ctx->zin.next_out = NULL;
480 : ctx->zin.avail_out = 0;
481 : ctx->zout.zalloc = Z_NULL;
482 : ctx->zout.zfree = Z_NULL;
483 : ctx->zout.next_in = NULL;
484 : ctx->zout.avail_in = 0;
485 : ctx->zout.next_out = NULL;
486 : ctx->zout.avail_out = 0;
487 : ctx->odone = 0;
488 : ctx->comp_level = Z_DEFAULT_COMPRESSION;
489 : bi->init = 1;
490 : bi->ptr = (char *)ctx;
491 : bi->flags = 0;
492 : return 1;
493 : }
494 :
495 : static int bio_zlib_free(BIO *bi)
496 : {
497 : BIO_ZLIB_CTX *ctx;
498 : if (!bi)
499 : return 0;
500 : ctx = (BIO_ZLIB_CTX *) bi->ptr;
501 : if (ctx->ibuf) {
502 : /* Destroy decompress context */
503 : inflateEnd(&ctx->zin);
504 : OPENSSL_free(ctx->ibuf);
505 : }
506 : if (ctx->obuf) {
507 : /* Destroy compress context */
508 : deflateEnd(&ctx->zout);
509 : OPENSSL_free(ctx->obuf);
510 : }
511 : OPENSSL_free(ctx);
512 : bi->ptr = NULL;
513 : bi->init = 0;
514 : bi->flags = 0;
515 : return 1;
516 : }
517 :
518 : static int bio_zlib_read(BIO *b, char *out, int outl)
519 : {
520 : BIO_ZLIB_CTX *ctx;
521 : int ret;
522 : z_stream *zin;
523 : if (!out || !outl)
524 : return 0;
525 : ctx = (BIO_ZLIB_CTX *) b->ptr;
526 : zin = &ctx->zin;
527 : BIO_clear_retry_flags(b);
528 : if (!ctx->ibuf) {
529 : ctx->ibuf = OPENSSL_malloc(ctx->ibufsize);
530 : if (!ctx->ibuf) {
531 : COMPerr(COMP_F_BIO_ZLIB_READ, ERR_R_MALLOC_FAILURE);
532 : return 0;
533 : }
534 : inflateInit(zin);
535 : zin->next_in = ctx->ibuf;
536 : zin->avail_in = 0;
537 : }
538 :
539 : /* Copy output data directly to supplied buffer */
540 : zin->next_out = (unsigned char *)out;
541 : zin->avail_out = (unsigned int)outl;
542 : for (;;) {
543 : /* Decompress while data available */
544 : while (zin->avail_in) {
545 : ret = inflate(zin, 0);
546 : if ((ret != Z_OK) && (ret != Z_STREAM_END)) {
547 : COMPerr(COMP_F_BIO_ZLIB_READ, COMP_R_ZLIB_INFLATE_ERROR);
548 : ERR_add_error_data(2, "zlib error:", zError(ret));
549 : return 0;
550 : }
551 : /* If EOF or we've read everything then return */
552 : if ((ret == Z_STREAM_END) || !zin->avail_out)
553 : return outl - zin->avail_out;
554 : }
555 :
556 : /*
557 : * No data in input buffer try to read some in, if an error then
558 : * return the total data read.
559 : */
560 : ret = BIO_read(b->next_bio, ctx->ibuf, ctx->ibufsize);
561 : if (ret <= 0) {
562 : /* Total data read */
563 : int tot = outl - zin->avail_out;
564 : BIO_copy_next_retry(b);
565 : if (ret < 0)
566 : return (tot > 0) ? tot : ret;
567 : return tot;
568 : }
569 : zin->avail_in = ret;
570 : zin->next_in = ctx->ibuf;
571 : }
572 : }
573 :
574 : static int bio_zlib_write(BIO *b, const char *in, int inl)
575 : {
576 : BIO_ZLIB_CTX *ctx;
577 : int ret;
578 : z_stream *zout;
579 : if (!in || !inl)
580 : return 0;
581 : ctx = (BIO_ZLIB_CTX *) b->ptr;
582 : if (ctx->odone)
583 : return 0;
584 : zout = &ctx->zout;
585 : BIO_clear_retry_flags(b);
586 : if (!ctx->obuf) {
587 : ctx->obuf = OPENSSL_malloc(ctx->obufsize);
588 : /* Need error here */
589 : if (!ctx->obuf) {
590 : COMPerr(COMP_F_BIO_ZLIB_WRITE, ERR_R_MALLOC_FAILURE);
591 : return 0;
592 : }
593 : ctx->optr = ctx->obuf;
594 : ctx->ocount = 0;
595 : deflateInit(zout, ctx->comp_level);
596 : zout->next_out = ctx->obuf;
597 : zout->avail_out = ctx->obufsize;
598 : }
599 : /* Obtain input data directly from supplied buffer */
600 : zout->next_in = (void *)in;
601 : zout->avail_in = inl;
602 : for (;;) {
603 : /* If data in output buffer write it first */
604 : while (ctx->ocount) {
605 : ret = BIO_write(b->next_bio, ctx->optr, ctx->ocount);
606 : if (ret <= 0) {
607 : /* Total data written */
608 : int tot = inl - zout->avail_in;
609 : BIO_copy_next_retry(b);
610 : if (ret < 0)
611 : return (tot > 0) ? tot : ret;
612 : return tot;
613 : }
614 : ctx->optr += ret;
615 : ctx->ocount -= ret;
616 : }
617 :
618 : /* Have we consumed all supplied data? */
619 : if (!zout->avail_in)
620 : return inl;
621 :
622 : /* Compress some more */
623 :
624 : /* Reset buffer */
625 : ctx->optr = ctx->obuf;
626 : zout->next_out = ctx->obuf;
627 : zout->avail_out = ctx->obufsize;
628 : /* Compress some more */
629 : ret = deflate(zout, 0);
630 : if (ret != Z_OK) {
631 : COMPerr(COMP_F_BIO_ZLIB_WRITE, COMP_R_ZLIB_DEFLATE_ERROR);
632 : ERR_add_error_data(2, "zlib error:", zError(ret));
633 : return 0;
634 : }
635 : ctx->ocount = ctx->obufsize - zout->avail_out;
636 : }
637 : }
638 :
639 : static int bio_zlib_flush(BIO *b)
640 : {
641 : BIO_ZLIB_CTX *ctx;
642 : int ret;
643 : z_stream *zout;
644 : ctx = (BIO_ZLIB_CTX *) b->ptr;
645 : /* If no data written or already flush show success */
646 : if (!ctx->obuf || (ctx->odone && !ctx->ocount))
647 : return 1;
648 : zout = &ctx->zout;
649 : BIO_clear_retry_flags(b);
650 : /* No more input data */
651 : zout->next_in = NULL;
652 : zout->avail_in = 0;
653 : for (;;) {
654 : /* If data in output buffer write it first */
655 : while (ctx->ocount) {
656 : ret = BIO_write(b->next_bio, ctx->optr, ctx->ocount);
657 : if (ret <= 0) {
658 : BIO_copy_next_retry(b);
659 : return ret;
660 : }
661 : ctx->optr += ret;
662 : ctx->ocount -= ret;
663 : }
664 : if (ctx->odone)
665 : return 1;
666 :
667 : /* Compress some more */
668 :
669 : /* Reset buffer */
670 : ctx->optr = ctx->obuf;
671 : zout->next_out = ctx->obuf;
672 : zout->avail_out = ctx->obufsize;
673 : /* Compress some more */
674 : ret = deflate(zout, Z_FINISH);
675 : if (ret == Z_STREAM_END)
676 : ctx->odone = 1;
677 : else if (ret != Z_OK) {
678 : COMPerr(COMP_F_BIO_ZLIB_FLUSH, COMP_R_ZLIB_DEFLATE_ERROR);
679 : ERR_add_error_data(2, "zlib error:", zError(ret));
680 : return 0;
681 : }
682 : ctx->ocount = ctx->obufsize - zout->avail_out;
683 : }
684 : }
685 :
686 : static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr)
687 : {
688 : BIO_ZLIB_CTX *ctx;
689 : int ret, *ip;
690 : int ibs, obs;
691 : if (!b->next_bio)
692 : return 0;
693 : ctx = (BIO_ZLIB_CTX *) b->ptr;
694 : switch (cmd) {
695 :
696 : case BIO_CTRL_RESET:
697 : ctx->ocount = 0;
698 : ctx->odone = 0;
699 : ret = 1;
700 : break;
701 :
702 : case BIO_CTRL_FLUSH:
703 : ret = bio_zlib_flush(b);
704 : if (ret > 0)
705 : ret = BIO_flush(b->next_bio);
706 : break;
707 :
708 : case BIO_C_SET_BUFF_SIZE:
709 : ibs = -1;
710 : obs = -1;
711 : if (ptr != NULL) {
712 : ip = ptr;
713 : if (*ip == 0)
714 : ibs = (int)num;
715 : else
716 : obs = (int)num;
717 : } else {
718 : ibs = (int)num;
719 : obs = ibs;
720 : }
721 :
722 : if (ibs != -1) {
723 : if (ctx->ibuf) {
724 : OPENSSL_free(ctx->ibuf);
725 : ctx->ibuf = NULL;
726 : }
727 : ctx->ibufsize = ibs;
728 : }
729 :
730 : if (obs != -1) {
731 : if (ctx->obuf) {
732 : OPENSSL_free(ctx->obuf);
733 : ctx->obuf = NULL;
734 : }
735 : ctx->obufsize = obs;
736 : }
737 : ret = 1;
738 : break;
739 :
740 : case BIO_C_DO_STATE_MACHINE:
741 : BIO_clear_retry_flags(b);
742 : ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
743 : BIO_copy_next_retry(b);
744 : break;
745 :
746 : default:
747 : ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
748 : break;
749 :
750 : }
751 :
752 : return ret;
753 : }
754 :
755 : static long bio_zlib_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
756 : {
757 : if (!b->next_bio)
758 : return 0;
759 : return BIO_callback_ctrl(b->next_bio, cmd, fp);
760 : }
761 :
762 : #endif
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