4 #include <openssl/objects.h>
5 #include <openssl/comp.h>
6 #include <openssl/err.h>
8 COMP_METHOD *COMP_zlib(void);
10 static COMP_METHOD zlib_method_nozlib = {
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,
32 static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
33 unsigned int olen, unsigned char *in,
36 /* memory allocations functions for zlib intialization */
37 static void *zlib_zalloc(void *opaque, unsigned int no, unsigned int size)
41 p = OPENSSL_malloc(no * size);
43 memset(p, 0, no * size);
47 static void zlib_zfree(void *opaque, void *address)
49 OPENSSL_free(address);
53 static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
54 unsigned int olen, unsigned char *in,
56 static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
57 unsigned int olen, unsigned char *in,
60 static int zz_uncompress(Bytef *dest, uLongf * destLen, const Bytef *source,
63 static COMP_METHOD zlib_stateless_method = {
75 static COMP_METHOD zlib_stateful_method = {
80 zlib_stateful_compress_block,
81 zlib_stateful_expand_block,
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.
92 # if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
94 # endif /* !(OPENSSL_SYS_WINDOWS ||
95 * OPENSSL_SYS_WIN32) */
98 # include <openssl/dso.h>
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;
121 static int zlib_loaded = 0; /* only attempt to init func pts once */
122 static DSO *zlib_dso = NULL;
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 */
139 static int zlib_stateful_ex_idx = -1;
141 static int zlib_stateful_init(COMP_CTX *ctx)
144 struct zlib_state *state =
145 (struct zlib_state *)OPENSSL_malloc(sizeof(struct zlib_state));
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));
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));
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);
182 static void zlib_stateful_finish(COMP_CTX *ctx)
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);
190 CRYPTO_free_ex_data(CRYPTO_EX_INDEX_COMP, ctx, &ctx->ex_data);
193 static int zlib_stateful_compress_block(COMP_CTX *ctx, unsigned char *out,
194 unsigned int olen, unsigned char *in,
198 struct zlib_state *state =
199 (struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
200 zlib_stateful_ex_idx);
205 state->ostream.next_in = in;
206 state->ostream.avail_in = ilen;
207 state->ostream.next_out = out;
208 state->ostream.avail_out = olen;
210 err = deflate(&state->ostream, Z_SYNC_FLUSH);
214 fprintf(stderr, "compress(%4d)->%4d %s\n",
215 ilen, olen - state->ostream.avail_out,
216 (ilen != olen - state->ostream.avail_out) ? "zlib" : "clear");
218 return olen - state->ostream.avail_out;
221 static int zlib_stateful_expand_block(COMP_CTX *ctx, unsigned char *out,
222 unsigned int olen, unsigned char *in,
227 struct zlib_state *state =
228 (struct zlib_state *)CRYPTO_get_ex_data(&ctx->ex_data,
229 zlib_stateful_ex_idx);
234 state->istream.next_in = in;
235 state->istream.avail_in = ilen;
236 state->istream.next_out = out;
237 state->istream.avail_out = olen;
239 err = inflate(&state->istream, Z_SYNC_FLUSH);
243 fprintf(stderr, "expand(%4d)->%4d %s\n",
244 ilen, olen - state->istream.avail_out,
245 (ilen != olen - state->istream.avail_out) ? "zlib" : "clear");
247 return olen - state->istream.avail_out;
251 static int zlib_compress_block(COMP_CTX *ctx, unsigned char *out,
252 unsigned int olen, unsigned char *in,
262 i = compress(&(out[1]), &l, in, (unsigned long)ilen);
272 memcpy(&(out[1]), in, ilen);
276 fprintf(stderr, "compress(%4d)->%4d %s\n",
277 ilen, (int)l, (clear) ? "clear" : "zlib");
282 static int zlib_expand_block(COMP_CTX *ctx, unsigned char *out,
283 unsigned int olen, unsigned char *in,
291 i = zz_uncompress(out, &l, &(in[1]), (unsigned long)ilen - 1);
295 memcpy(out, &(in[1]), ilen - 1);
299 fprintf(stderr, "expand (%4d)->%4d %s\n",
300 ilen, (int)l, in[0] ? "zlib" : "clear");
305 static int zz_uncompress(Bytef *dest, uLongf * destLen, const Bytef *source,
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)
317 stream.next_out = dest;
318 stream.avail_out = (uInt) * destLen;
319 if ((uLong) stream.avail_out != *destLen)
322 stream.zalloc = (alloc_func) 0;
323 stream.zfree = (free_func) 0;
325 err = inflateInit_(&stream, ZLIB_VERSION, sizeof(z_stream));
329 err = inflate(&stream, Z_FINISH);
330 if (err != Z_STREAM_END) {
334 *destLen = stream.total_out;
336 err = inflateEnd(&stream);
343 COMP_METHOD *COMP_zlib(void)
345 COMP_METHOD *meth = &zlib_method_nozlib;
349 # if defined(OPENSSL_SYS_WINDOWS) || defined(OPENSSL_SYS_WIN32)
350 zlib_dso = DSO_load(NULL, "ZLIB1", NULL, 0);
352 zlib_dso = DSO_load(NULL, "z", NULL, 0);
354 if (zlib_dso != NULL) {
355 p_compress = (compress_ft) DSO_bind_func(zlib_dso, "compress");
357 = (inflateEnd_ft) DSO_bind_func(zlib_dso, "inflateEnd");
358 p_inflate = (inflate_ft) DSO_bind_func(zlib_dso, "inflate");
360 = (inflateInit__ft) DSO_bind_func(zlib_dso, "inflateInit_");
362 = (deflateEnd_ft) DSO_bind_func(zlib_dso, "deflateEnd");
363 p_deflate = (deflate_ft) DSO_bind_func(zlib_dso, "deflate");
365 = (deflateInit__ft) DSO_bind_func(zlib_dso, "deflateInit_");
366 p_zError = (zError__ft) DSO_bind_func(zlib_dso, "zError");
368 if (p_compress && p_inflateEnd && p_inflate
369 && p_inflateInit_ && p_deflateEnd
370 && p_deflate && p_deflateInit_ && p_zError)
378 #if defined(ZLIB) || defined(ZLIB_SHARED)
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)
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)
396 meth = &zlib_stateful_method;
404 void COMP_zlib_cleanup(void)
407 if (zlib_dso != NULL)
415 /* Zlib based compression/decompression filter BIO */
418 unsigned char *ibuf; /* Input buffer */
419 int ibufsize; /* Buffer size */
420 z_stream zin; /* Input decompress context */
421 unsigned char *obuf; /* Output buffer */
422 int obufsize; /* Output buffer size */
423 unsigned char *optr; /* Position in output buffer */
424 int ocount; /* Amount of data in output buffer */
425 int odone; /* deflate EOF */
426 int comp_level; /* Compression level to use */
427 z_stream zout; /* Output compression context */
430 # define ZLIB_DEFAULT_BUFSIZE 1024
432 static int bio_zlib_new(BIO *bi);
433 static int bio_zlib_free(BIO *bi);
434 static int bio_zlib_read(BIO *b, char *out, int outl);
435 static int bio_zlib_write(BIO *b, const char *in, int inl);
436 static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr);
437 static long bio_zlib_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp);
439 static BIO_METHOD bio_meth_zlib = {
449 bio_zlib_callback_ctrl
452 BIO_METHOD *BIO_f_zlib(void)
454 return &bio_meth_zlib;
457 static int bio_zlib_new(BIO *bi)
463 COMPerr(COMP_F_BIO_ZLIB_NEW, COMP_R_ZLIB_NOT_SUPPORTED);
467 ctx = OPENSSL_malloc(sizeof(BIO_ZLIB_CTX));
469 COMPerr(COMP_F_BIO_ZLIB_NEW, ERR_R_MALLOC_FAILURE);
474 ctx->ibufsize = ZLIB_DEFAULT_BUFSIZE;
475 ctx->obufsize = ZLIB_DEFAULT_BUFSIZE;
476 ctx->zin.zalloc = Z_NULL;
477 ctx->zin.zfree = Z_NULL;
478 ctx->zin.next_in = NULL;
479 ctx->zin.avail_in = 0;
480 ctx->zin.next_out = NULL;
481 ctx->zin.avail_out = 0;
482 ctx->zout.zalloc = Z_NULL;
483 ctx->zout.zfree = Z_NULL;
484 ctx->zout.next_in = NULL;
485 ctx->zout.avail_in = 0;
486 ctx->zout.next_out = NULL;
487 ctx->zout.avail_out = 0;
489 ctx->comp_level = Z_DEFAULT_COMPRESSION;
491 bi->ptr = (char *)ctx;
496 static int bio_zlib_free(BIO *bi)
501 ctx = (BIO_ZLIB_CTX *) bi->ptr;
503 /* Destroy decompress context */
504 inflateEnd(&ctx->zin);
505 OPENSSL_free(ctx->ibuf);
508 /* Destroy compress context */
509 deflateEnd(&ctx->zout);
510 OPENSSL_free(ctx->obuf);
519 static int bio_zlib_read(BIO *b, char *out, int outl)
526 ctx = (BIO_ZLIB_CTX *) b->ptr;
528 BIO_clear_retry_flags(b);
530 ctx->ibuf = OPENSSL_malloc(ctx->ibufsize);
532 COMPerr(COMP_F_BIO_ZLIB_READ, ERR_R_MALLOC_FAILURE);
536 zin->next_in = ctx->ibuf;
540 /* Copy output data directly to supplied buffer */
541 zin->next_out = (unsigned char *)out;
542 zin->avail_out = (unsigned int)outl;
544 /* Decompress while data available */
545 while (zin->avail_in) {
546 ret = inflate(zin, 0);
547 if ((ret != Z_OK) && (ret != Z_STREAM_END)) {
548 COMPerr(COMP_F_BIO_ZLIB_READ, COMP_R_ZLIB_INFLATE_ERROR);
549 ERR_add_error_data(2, "zlib error:", zError(ret));
552 /* If EOF or we've read everything then return */
553 if ((ret == Z_STREAM_END) || !zin->avail_out)
554 return outl - zin->avail_out;
558 * No data in input buffer try to read some in, if an error then
559 * return the total data read.
561 ret = BIO_read(b->next_bio, ctx->ibuf, ctx->ibufsize);
563 /* Total data read */
564 int tot = outl - zin->avail_out;
565 BIO_copy_next_retry(b);
567 return (tot > 0) ? tot : ret;
571 zin->next_in = ctx->ibuf;
575 static int bio_zlib_write(BIO *b, const char *in, int inl)
582 ctx = (BIO_ZLIB_CTX *) b->ptr;
586 BIO_clear_retry_flags(b);
588 ctx->obuf = OPENSSL_malloc(ctx->obufsize);
589 /* Need error here */
591 COMPerr(COMP_F_BIO_ZLIB_WRITE, ERR_R_MALLOC_FAILURE);
594 ctx->optr = ctx->obuf;
596 deflateInit(zout, ctx->comp_level);
597 zout->next_out = ctx->obuf;
598 zout->avail_out = ctx->obufsize;
600 /* Obtain input data directly from supplied buffer */
601 zout->next_in = (void *)in;
602 zout->avail_in = inl;
604 /* If data in output buffer write it first */
605 while (ctx->ocount) {
606 ret = BIO_write(b->next_bio, ctx->optr, ctx->ocount);
608 /* Total data written */
609 int tot = inl - zout->avail_in;
610 BIO_copy_next_retry(b);
612 return (tot > 0) ? tot : ret;
619 /* Have we consumed all supplied data? */
623 /* Compress some more */
626 ctx->optr = ctx->obuf;
627 zout->next_out = ctx->obuf;
628 zout->avail_out = ctx->obufsize;
629 /* Compress some more */
630 ret = deflate(zout, 0);
632 COMPerr(COMP_F_BIO_ZLIB_WRITE, COMP_R_ZLIB_DEFLATE_ERROR);
633 ERR_add_error_data(2, "zlib error:", zError(ret));
636 ctx->ocount = ctx->obufsize - zout->avail_out;
640 static int bio_zlib_flush(BIO *b)
645 ctx = (BIO_ZLIB_CTX *) b->ptr;
646 /* If no data written or already flush show success */
647 if (!ctx->obuf || (ctx->odone && !ctx->ocount))
650 BIO_clear_retry_flags(b);
651 /* No more input data */
652 zout->next_in = NULL;
655 /* If data in output buffer write it first */
656 while (ctx->ocount) {
657 ret = BIO_write(b->next_bio, ctx->optr, ctx->ocount);
659 BIO_copy_next_retry(b);
668 /* Compress some more */
671 ctx->optr = ctx->obuf;
672 zout->next_out = ctx->obuf;
673 zout->avail_out = ctx->obufsize;
674 /* Compress some more */
675 ret = deflate(zout, Z_FINISH);
676 if (ret == Z_STREAM_END)
678 else if (ret != Z_OK) {
679 COMPerr(COMP_F_BIO_ZLIB_FLUSH, COMP_R_ZLIB_DEFLATE_ERROR);
680 ERR_add_error_data(2, "zlib error:", zError(ret));
683 ctx->ocount = ctx->obufsize - zout->avail_out;
687 static long bio_zlib_ctrl(BIO *b, int cmd, long num, void *ptr)
694 ctx = (BIO_ZLIB_CTX *) b->ptr;
704 ret = bio_zlib_flush(b);
706 ret = BIO_flush(b->next_bio);
709 case BIO_C_SET_BUFF_SIZE:
725 OPENSSL_free(ctx->ibuf);
733 OPENSSL_free(ctx->obuf);
741 case BIO_C_DO_STATE_MACHINE:
742 BIO_clear_retry_flags(b);
743 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
744 BIO_copy_next_retry(b);
748 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
756 static long bio_zlib_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
760 return BIO_callback_ctrl(b->next_bio, cmd, fp);