VirtualBox

source: vbox/trunk/src/libs/openssl-3.1.0/crypto/comp/c_zlib.c@ 100908

最後變更 在這個檔案從100908是 99366,由 vboxsync 提交於 21 月 前

openssl-3.1.0: Applied and adjusted our OpenSSL changes to 3.0.7. bugref:10418
檔案大小: 17.6 KB
行 
1/*
2 * Copyright 1998-2021 The OpenSSL Project Authors. All Rights Reserved.
3 *
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
8 */
9
10#include <stdio.h>
11#include <stdlib.h>
12#include <string.h>
13#include <openssl/objects.h>
14#include "internal/comp.h"
15#include <openssl/err.h>
16#include "crypto/cryptlib.h"
17#include "internal/bio.h"
18#include "internal/thread_once.h"
19#include "comp_local.h"
20
21COMP_METHOD *COMP_zlib(void);
22
23static COMP_METHOD zlib_method_nozlib = {
24 NID_undef,
25 "(undef)",
26 NULL,
27 NULL,
28 NULL,
29 NULL,
30};
31
32#ifndef ZLIB
33# undef ZLIB_SHARED
34#else
35
36# include <zlib.h>
37
38static int zlib_stateful_init(COMP_CTX *ctx);
39static void zlib_stateful_finish(COMP_CTX *ctx);
40static int zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out,
41 unsigned int olen, unsigned char *in,
42 unsigned int ilen);
43static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
44 unsigned int olen, unsigned char *in,
45 unsigned int ilen);
46
47/* memory allocations functions for zlib initialisation */
48static void *zlib_zalloc(void *opaque, unsigned int no, unsigned int size)
49{
50 void *p;
51
52 p = OPENSSL_zalloc(no * size);
53 return p;
54}
55
56static void zlib_zfree(void *opaque, void *address)
57{
58 OPENSSL_free(address);
59}
60
61
62static COMP_METHOD zlib_stateful_method = {
63 NID_zlib_compression,
64 LN_zlib_compression,
65 zlib_stateful_init,
66 zlib_stateful_finish,
67 zlib_stateful_compress_block,
68 zlib_stateful_expand_block
69};
70
71/*
72 * When OpenSSL is built on Windows, we do not want to require that
73 * the ZLIB.DLL be available in order for the OpenSSL DLLs to
74 * work. Therefore, all ZLIB routines are loaded at run time
75 * and we do not link to a .LIB file when ZLIB_SHARED is set.
76 */
77# if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
78# include <windows.h>
79# endif /* !(OPENSSL_SYS_WINDOWS ||
80 * OPENSSL_SYS_WIN32) */
81
82# ifdef ZLIB_SHARED
83# include "internal/dso.h"
84
85/* Function pointers */
86typedef int (*compress_ft) (Bytef *dest, uLongf * destLen,
87 const Bytef *source, uLong sourceLen);
88typedef int (*inflateEnd_ft) (z_streamp strm);
89typedef int (*inflate_ft) (z_streamp strm, int flush);
90typedef int (*inflateInit__ft) (z_streamp strm,
91 const char *version, int stream_size);
92typedef int (*deflateEnd_ft) (z_streamp strm);
93typedef int (*deflate_ft) (z_streamp strm, int flush);
94typedef int (*deflateInit__ft) (z_streamp strm, int level,
95 const char *version, int stream_size);
96typedef const char *(*zError__ft) (int err);
97static compress_ft p_compress = NULL;
98static inflateEnd_ft p_inflateEnd = NULL;
99static inflate_ft p_inflate = NULL;
100static inflateInit__ft p_inflateInit_ = NULL;
101static deflateEnd_ft p_deflateEnd = NULL;
102static deflate_ft p_deflate = NULL;
103static deflateInit__ft p_deflateInit_ = NULL;
104static zError__ft p_zError = NULL;
105
106static DSO *zlib_dso = NULL;
107
108# define compress p_compress
109# define inflateEnd p_inflateEnd
110# define inflate p_inflate
111# define inflateInit_ p_inflateInit_
112# define deflateEnd p_deflateEnd
113# define deflate p_deflate
114# define deflateInit_ p_deflateInit_
115# define zError p_zError
116# endif /* ZLIB_SHARED */
117
118struct zlib_state {
119 z_stream istream;
120 z_stream ostream;
121};
122
123static int zlib_stateful_init(COMP_CTX *ctx)
124{
125 int err;
126 struct zlib_state *state = OPENSSL_zalloc(sizeof(*state));
127
128 if (state == NULL)
129 goto err;
130
131 state->istream.zalloc = zlib_zalloc;
132 state->istream.zfree = zlib_zfree;
133 state->istream.opaque = Z_NULL;
134 state->istream.next_in = Z_NULL;
135 state->istream.next_out = Z_NULL;
136 err = inflateInit_(&state->istream, ZLIB_VERSION, sizeof(z_stream));
137 if (err != Z_OK)
138 goto err;
139
140 state->ostream.zalloc = zlib_zalloc;
141 state->ostream.zfree = zlib_zfree;
142 state->ostream.opaque = Z_NULL;
143 state->ostream.next_in = Z_NULL;
144 state->ostream.next_out = Z_NULL;
145 err = deflateInit_(&state->ostream, Z_DEFAULT_COMPRESSION,
146 ZLIB_VERSION, sizeof(z_stream));
147 if (err != Z_OK)
148 goto err;
149
150 ctx->data = state;
151 return 1;
152 err:
153 OPENSSL_free(state);
154 return 0;
155}
156
157static void zlib_stateful_finish(COMP_CTX *ctx)
158{
159 struct zlib_state *state = ctx->data;
160 inflateEnd(&state->istream);
161 deflateEnd(&state->ostream);
162 OPENSSL_free(state);
163}
164
165static int zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out,
166 unsigned int olen, unsigned char *in,
167 unsigned int ilen)
168{
169 int err = Z_OK;
170 struct zlib_state *state = ctx->data;
171
172 if (state == NULL)
173 return -1;
174
175 state->ostream.next_in = in;
176 state->ostream.avail_in = ilen;
177 state->ostream.next_out = out;
178 state->ostream.avail_out = olen;
179 if (ilen > 0)
180 err = deflate(&state->ostream, Z_SYNC_FLUSH);
181 if (err != Z_OK)
182 return -1;
183 return olen - state->ostream.avail_out;
184}
185
186static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
187 unsigned int olen, unsigned char *in,
188 unsigned int ilen)
189{
190 int err = Z_OK;
191 struct zlib_state *state = ctx->data;
192
193 if (state == NULL)
194 return 0;
195
196 state->istream.next_in = in;
197 state->istream.avail_in = ilen;
198 state->istream.next_out = out;
199 state->istream.avail_out = olen;
200 if (ilen > 0)
201 err = inflate(&state->istream, Z_SYNC_FLUSH);
202 if (err != Z_OK)
203 return -1;
204 return olen - state->istream.avail_out;
205}
206
207static CRYPTO_ONCE zlib_once = CRYPTO_ONCE_STATIC_INIT;
208DEFINE_RUN_ONCE_STATIC(ossl_comp_zlib_init)
209{
210# ifdef ZLIB_SHARED
211 /* LIBZ may be externally defined, and we should respect that value */
212# ifndef LIBZ
213# if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
214# define LIBZ "ZLIB1"
215# elif defined(OPENSSL_SYS_VMS)
216# define LIBZ "LIBZ"
217# else
218# define LIBZ "z"
219# endif
220# endif
221
222 zlib_dso = DSO_load(NULL, LIBZ, NULL, 0);
223 if (zlib_dso != NULL) {
224 p_compress = (compress_ft) DSO_bind_func(zlib_dso, "compress");
225 p_inflateEnd = (inflateEnd_ft) DSO_bind_func(zlib_dso, "inflateEnd");
226 p_inflate = (inflate_ft) DSO_bind_func(zlib_dso, "inflate");
227 p_inflateInit_ = (inflateInit__ft) DSO_bind_func(zlib_dso, "inflateInit_");
228 p_deflateEnd = (deflateEnd_ft) DSO_bind_func(zlib_dso, "deflateEnd");
229 p_deflate = (deflate_ft) DSO_bind_func(zlib_dso, "deflate");
230 p_deflateInit_ = (deflateInit__ft) DSO_bind_func(zlib_dso, "deflateInit_");
231 p_zError = (zError__ft) DSO_bind_func(zlib_dso, "zError");
232
233 if (p_compress == NULL || p_inflateEnd == NULL
234 || p_inflate == NULL || p_inflateInit_ == NULL
235 || p_deflateEnd == NULL || p_deflate == NULL
236 || p_deflateInit_ == NULL || p_zError == NULL) {
237 ossl_comp_zlib_cleanup();
238 return 0;
239 }
240 }
241# endif
242 return 1;
243}
244#endif
245
246COMP_METHOD *COMP_zlib(void)
247{
248 COMP_METHOD *meth = &zlib_method_nozlib;
249
250#ifdef ZLIB
251 if (RUN_ONCE(&zlib_once, ossl_comp_zlib_init))
252 meth = &zlib_stateful_method;
253#endif
254
255 return meth;
256}
257
258/* Also called from OPENSSL_cleanup() */
259void ossl_comp_zlib_cleanup(void)
260{
261#ifdef ZLIB_SHARED
262 DSO_free(zlib_dso);
263 zlib_dso = NULL;
264#endif
265}
266
267#ifdef ZLIB
268
269/* Zlib based compression/decompression filter BIO */
270
271typedef struct {
272 unsigned char *ibuf; /* Input buffer */
273 int ibufsize; /* Buffer size */
274 z_stream zin; /* Input decompress context */
275 unsigned char *obuf; /* Output buffer */
276 int obufsize; /* Output buffer size */
277 unsigned char *optr; /* Position in output buffer */
278 int ocount; /* Amount of data in output buffer */
279 int odone; /* deflate EOF */
280 int comp_level; /* Compression level to use */
281 z_stream zout; /* Output compression context */
282} BIO_ZLIB_CTX;
283
284# define ZLIB_DEFAULT_BUFSIZE 1024
285
286static int bio_zlib_new(BIO *bi);
287static int bio_zlib_free(BIO *bi);
288static int bio_zlib_read(BIO *b, char *out, int outl);
289static int bio_zlib_write(BIO *b, const char *in, int inl);
290static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr);
291static long bio_zlib_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp);
292
293static const BIO_METHOD bio_meth_zlib = {
294 BIO_TYPE_COMP,
295 "zlib",
296 bwrite_conv,
297 bio_zlib_write,
298 bread_conv,
299 bio_zlib_read,
300 NULL, /* bio_zlib_puts, */
301 NULL, /* bio_zlib_gets, */
302 bio_zlib_ctrl,
303 bio_zlib_new,
304 bio_zlib_free,
305 bio_zlib_callback_ctrl
306};
307
308const BIO_METHOD *BIO_f_zlib(void)
309{
310 return &bio_meth_zlib;
311}
312
313static int bio_zlib_new(BIO *bi)
314{
315 BIO_ZLIB_CTX *ctx;
316
317# ifdef ZLIB_SHARED
318 if (!RUN_ONCE(&zlib_once, ossl_comp_zlib_init)) {
319 ERR_raise(ERR_LIB_COMP, COMP_R_ZLIB_NOT_SUPPORTED);
320 return 0;
321 }
322# endif
323 ctx = OPENSSL_zalloc(sizeof(*ctx));
324 if (ctx == NULL) {
325 ERR_raise(ERR_LIB_COMP, ERR_R_MALLOC_FAILURE);
326 return 0;
327 }
328 ctx->ibufsize = ZLIB_DEFAULT_BUFSIZE;
329 ctx->obufsize = ZLIB_DEFAULT_BUFSIZE;
330 ctx->zin.zalloc = Z_NULL;
331 ctx->zin.zfree = Z_NULL;
332 ctx->zout.zalloc = Z_NULL;
333 ctx->zout.zfree = Z_NULL;
334 ctx->comp_level = Z_DEFAULT_COMPRESSION;
335 BIO_set_init(bi, 1);
336 BIO_set_data(bi, ctx);
337
338 return 1;
339}
340
341static int bio_zlib_free(BIO *bi)
342{
343 BIO_ZLIB_CTX *ctx;
344
345 if (!bi)
346 return 0;
347 ctx = BIO_get_data(bi);
348 if (ctx->ibuf) {
349 /* Destroy decompress context */
350 inflateEnd(&ctx->zin);
351 OPENSSL_free(ctx->ibuf);
352 }
353 if (ctx->obuf) {
354 /* Destroy compress context */
355 deflateEnd(&ctx->zout);
356 OPENSSL_free(ctx->obuf);
357 }
358 OPENSSL_free(ctx);
359 BIO_set_data(bi, NULL);
360 BIO_set_init(bi, 0);
361
362 return 1;
363}
364
365static int bio_zlib_read(BIO *b, char *out, int outl)
366{
367 BIO_ZLIB_CTX *ctx;
368 int ret;
369 z_stream *zin;
370 BIO *next = BIO_next(b);
371
372 if (!out || !outl)
373 return 0;
374 ctx = BIO_get_data(b);
375 zin = &ctx->zin;
376 BIO_clear_retry_flags(b);
377 if (!ctx->ibuf) {
378 ctx->ibuf = OPENSSL_malloc(ctx->ibufsize);
379 if (ctx->ibuf == NULL) {
380 ERR_raise(ERR_LIB_COMP, ERR_R_MALLOC_FAILURE);
381 return 0;
382 }
383 if ((ret = inflateInit(zin)) != Z_OK) {
384 ERR_raise_data(ERR_LIB_COMP, COMP_R_ZLIB_INFLATE_ERROR,
385 "zlib error: %s", zError(ret));
386 return 0;
387 }
388 zin->next_in = ctx->ibuf;
389 zin->avail_in = 0;
390 }
391
392 /* Copy output data directly to supplied buffer */
393 zin->next_out = (unsigned char *)out;
394 zin->avail_out = (unsigned int)outl;
395 for (;;) {
396 /* Decompress while data available */
397 while (zin->avail_in) {
398 ret = inflate(zin, 0);
399 if ((ret != Z_OK) && (ret != Z_STREAM_END)) {
400 ERR_raise_data(ERR_LIB_COMP, COMP_R_ZLIB_INFLATE_ERROR,
401 "zlib error: %s", zError(ret));
402 return 0;
403 }
404 /* If EOF or we've read everything then return */
405 if ((ret == Z_STREAM_END) || !zin->avail_out)
406 return outl - zin->avail_out;
407 }
408
409 /*
410 * No data in input buffer try to read some in, if an error then
411 * return the total data read.
412 */
413 ret = BIO_read(next, ctx->ibuf, ctx->ibufsize);
414 if (ret <= 0) {
415 /* Total data read */
416 int tot = outl - zin->avail_out;
417 BIO_copy_next_retry(b);
418 if (ret < 0)
419 return (tot > 0) ? tot : ret;
420 return tot;
421 }
422 zin->avail_in = ret;
423 zin->next_in = ctx->ibuf;
424 }
425}
426
427static int bio_zlib_write(BIO *b, const char *in, int inl)
428{
429 BIO_ZLIB_CTX *ctx;
430 int ret;
431 z_stream *zout;
432 BIO *next = BIO_next(b);
433
434 if (!in || !inl)
435 return 0;
436 ctx = BIO_get_data(b);
437 if (ctx->odone)
438 return 0;
439 zout = &ctx->zout;
440 BIO_clear_retry_flags(b);
441 if (!ctx->obuf) {
442 ctx->obuf = OPENSSL_malloc(ctx->obufsize);
443 /* Need error here */
444 if (ctx->obuf == NULL) {
445 ERR_raise(ERR_LIB_COMP, ERR_R_MALLOC_FAILURE);
446 return 0;
447 }
448 ctx->optr = ctx->obuf;
449 ctx->ocount = 0;
450 if ((ret = deflateInit(zout, ctx->comp_level)) != Z_OK) {
451 ERR_raise_data(ERR_LIB_COMP, COMP_R_ZLIB_DEFLATE_ERROR,
452 "zlib error: %s", zError(ret));
453 return 0;
454 }
455 zout->next_out = ctx->obuf;
456 zout->avail_out = ctx->obufsize;
457 }
458 /* Obtain input data directly from supplied buffer */
459 zout->next_in = (void *)in;
460 zout->avail_in = inl;
461 for (;;) {
462 /* If data in output buffer write it first */
463 while (ctx->ocount) {
464 ret = BIO_write(next, ctx->optr, ctx->ocount);
465 if (ret <= 0) {
466 /* Total data written */
467 int tot = inl - zout->avail_in;
468 BIO_copy_next_retry(b);
469 if (ret < 0)
470 return (tot > 0) ? tot : ret;
471 return tot;
472 }
473 ctx->optr += ret;
474 ctx->ocount -= ret;
475 }
476
477 /* Have we consumed all supplied data? */
478 if (!zout->avail_in)
479 return inl;
480
481 /* Compress some more */
482
483 /* Reset buffer */
484 ctx->optr = ctx->obuf;
485 zout->next_out = ctx->obuf;
486 zout->avail_out = ctx->obufsize;
487 /* Compress some more */
488 ret = deflate(zout, 0);
489 if (ret != Z_OK) {
490 ERR_raise_data(ERR_LIB_COMP, COMP_R_ZLIB_DEFLATE_ERROR,
491 "zlib error: %s", zError(ret));
492 return 0;
493 }
494 ctx->ocount = ctx->obufsize - zout->avail_out;
495 }
496}
497
498static int bio_zlib_flush(BIO *b)
499{
500 BIO_ZLIB_CTX *ctx;
501 int ret;
502 z_stream *zout;
503 BIO *next = BIO_next(b);
504
505 ctx = BIO_get_data(b);
506 /* If no data written or already flush show success */
507 if (!ctx->obuf || (ctx->odone && !ctx->ocount))
508 return 1;
509 zout = &ctx->zout;
510 BIO_clear_retry_flags(b);
511 /* No more input data */
512 zout->next_in = NULL;
513 zout->avail_in = 0;
514 for (;;) {
515 /* If data in output buffer write it first */
516 while (ctx->ocount) {
517 ret = BIO_write(next, ctx->optr, ctx->ocount);
518 if (ret <= 0) {
519 BIO_copy_next_retry(b);
520 return ret;
521 }
522 ctx->optr += ret;
523 ctx->ocount -= ret;
524 }
525 if (ctx->odone)
526 return 1;
527
528 /* Compress some more */
529
530 /* Reset buffer */
531 ctx->optr = ctx->obuf;
532 zout->next_out = ctx->obuf;
533 zout->avail_out = ctx->obufsize;
534 /* Compress some more */
535 ret = deflate(zout, Z_FINISH);
536 if (ret == Z_STREAM_END)
537 ctx->odone = 1;
538 else if (ret != Z_OK) {
539 ERR_raise_data(ERR_LIB_COMP, COMP_R_ZLIB_DEFLATE_ERROR,
540 "zlib error: %s", zError(ret));
541 return 0;
542 }
543 ctx->ocount = ctx->obufsize - zout->avail_out;
544 }
545}
546
547static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr)
548{
549 BIO_ZLIB_CTX *ctx;
550 int ret, *ip;
551 int ibs, obs;
552 BIO *next = BIO_next(b);
553
554 if (next == NULL)
555 return 0;
556 ctx = BIO_get_data(b);
557 switch (cmd) {
558
559 case BIO_CTRL_RESET:
560 ctx->ocount = 0;
561 ctx->odone = 0;
562 ret = 1;
563 break;
564
565 case BIO_CTRL_FLUSH:
566 ret = bio_zlib_flush(b);
567 if (ret > 0)
568 ret = BIO_flush(next);
569 break;
570
571 case BIO_C_SET_BUFF_SIZE:
572 ibs = -1;
573 obs = -1;
574 if (ptr != NULL) {
575 ip = ptr;
576 if (*ip == 0)
577 ibs = (int)num;
578 else
579 obs = (int)num;
580 } else {
581 ibs = (int)num;
582 obs = ibs;
583 }
584
585 if (ibs != -1) {
586 OPENSSL_free(ctx->ibuf);
587 ctx->ibuf = NULL;
588 ctx->ibufsize = ibs;
589 }
590
591 if (obs != -1) {
592 OPENSSL_free(ctx->obuf);
593 ctx->obuf = NULL;
594 ctx->obufsize = obs;
595 }
596 ret = 1;
597 break;
598
599 case BIO_C_DO_STATE_MACHINE:
600 BIO_clear_retry_flags(b);
601 ret = BIO_ctrl(next, cmd, num, ptr);
602 BIO_copy_next_retry(b);
603 break;
604
605 case BIO_CTRL_WPENDING:
606 if (ctx->obuf == NULL)
607 return 0;
608
609 if (ctx->odone) {
610 ret = ctx->ocount;
611 } else {
612 ret = ctx->ocount;
613 if (ret == 0)
614 /* Unknown amount pending but we are not finished */
615 ret = 1;
616 }
617 if (ret == 0)
618 ret = BIO_ctrl(next, cmd, num, ptr);
619 break;
620
621 case BIO_CTRL_PENDING:
622 ret = ctx->zin.avail_in;
623 if (ret == 0)
624 ret = BIO_ctrl(next, cmd, num, ptr);
625 break;
626
627 default:
628 ret = BIO_ctrl(next, cmd, num, ptr);
629 break;
630
631 }
632
633 return ret;
634}
635
636static long bio_zlib_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
637{
638 BIO *next = BIO_next(b);
639
640 if (next == NULL)
641 return 0;
642 return BIO_callback_ctrl(next, cmd, fp);
643}
644
645#endif
注意: 瀏覽 TracBrowser 來幫助您使用儲存庫瀏覽器

© 2024 Oracle Support Privacy / Do Not Sell My Info Terms of Use Trademark Policy Automated Access Etiquette