1 /* crypto/bio/bf_buff.c */
2 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
5 * This package is an SSL implementation written
6 * by Eric Young (eay@cryptsoft.com).
7 * The implementation was written so as to conform with Netscapes SSL.
9 * This library is free for commercial and non-commercial use as long as
10 * the following conditions are aheared to. The following conditions
11 * apply to all code found in this distribution, be it the RC4, RSA,
12 * lhash, DES, etc., code; not just the SSL code. The SSL documentation
13 * included with this distribution is covered by the same copyright terms
14 * except that the holder is Tim Hudson (tjh@cryptsoft.com).
16 * Copyright remains Eric Young's, and as such any Copyright notices in
17 * the code are not to be removed.
18 * If this package is used in a product, Eric Young should be given attribution
19 * as the author of the parts of the library used.
20 * This can be in the form of a textual message at program startup or
21 * in documentation (online or textual) provided with the package.
23 * Redistribution and use in source and binary forms, with or without
24 * modification, are permitted provided that the following conditions
26 * 1. Redistributions of source code must retain the copyright
27 * notice, this list of conditions and the following disclaimer.
28 * 2. Redistributions in binary form must reproduce the above copyright
29 * notice, this list of conditions and the following disclaimer in the
30 * documentation and/or other materials provided with the distribution.
31 * 3. All advertising materials mentioning features or use of this software
32 * must display the following acknowledgement:
33 * "This product includes cryptographic software written by
34 * Eric Young (eay@cryptsoft.com)"
35 * The word 'cryptographic' can be left out if the rouines from the library
36 * being used are not cryptographic related :-).
37 * 4. If you include any Windows specific code (or a derivative thereof) from
38 * the apps directory (application code) you must include an acknowledgement:
39 * "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
41 * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
42 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
43 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
44 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
45 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
46 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
47 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
48 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
49 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
50 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
53 * The licence and distribution terms for any publically available version or
54 * derivative of this code cannot be changed. i.e. this code cannot simply be
55 * copied and put under another distribution licence
56 * [including the GNU Public Licence.]
61 #include "internal/cryptlib.h"
62 #include <openssl/bio.h>
64 static int buffer_write(BIO *h, const char *buf, int num);
65 static int buffer_read(BIO *h, char *buf, int size);
66 static int buffer_puts(BIO *h, const char *str);
67 static int buffer_gets(BIO *h, char *str, int size);
68 static long buffer_ctrl(BIO *h, int cmd, long arg1, void *arg2);
69 static int buffer_new(BIO *h);
70 static int buffer_free(BIO *data);
71 static long buffer_callback_ctrl(BIO *h, int cmd, bio_info_cb *fp);
72 #define DEFAULT_BUFFER_SIZE 4096
74 static BIO_METHOD methods_buffer = {
87 BIO_METHOD *BIO_f_buffer(void)
89 return (&methods_buffer);
92 static int buffer_new(BIO *bi)
94 BIO_F_BUFFER_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx));
98 ctx->ibuf_size = DEFAULT_BUFFER_SIZE;
99 ctx->ibuf = OPENSSL_malloc(DEFAULT_BUFFER_SIZE);
100 if (ctx->ibuf == NULL) {
104 ctx->obuf_size = DEFAULT_BUFFER_SIZE;
105 ctx->obuf = OPENSSL_malloc(DEFAULT_BUFFER_SIZE);
106 if (ctx->obuf == NULL) {
107 OPENSSL_free(ctx->ibuf);
113 bi->ptr = (char *)ctx;
118 static int buffer_free(BIO *a)
124 b = (BIO_F_BUFFER_CTX *)a->ptr;
125 OPENSSL_free(b->ibuf);
126 OPENSSL_free(b->obuf);
127 OPENSSL_free(a->ptr);
134 static int buffer_read(BIO *b, char *out, int outl)
137 BIO_F_BUFFER_CTX *ctx;
141 ctx = (BIO_F_BUFFER_CTX *)b->ptr;
143 if ((ctx == NULL) || (b->next_bio == NULL))
146 BIO_clear_retry_flags(b);
150 /* If there is stuff left over, grab it */
154 memcpy(out, &(ctx->ibuf[ctx->ibuf_off]), i);
165 * We may have done a partial read. try to do more. We have nothing in
166 * the buffer. If we get an error and have read some data, just return it
167 * and let them retry to get the error again. copy direct to parent
170 if (outl > ctx->ibuf_size) {
172 i = BIO_read(b->next_bio, out, outl);
174 BIO_copy_next_retry(b);
176 return ((num > 0) ? num : i);
189 /* we are going to be doing some buffering */
190 i = BIO_read(b->next_bio, ctx->ibuf, ctx->ibuf_size);
192 BIO_copy_next_retry(b);
194 return ((num > 0) ? num : i);
201 /* Lets re-read using ourselves :-) */
205 static int buffer_write(BIO *b, const char *in, int inl)
208 BIO_F_BUFFER_CTX *ctx;
210 if ((in == NULL) || (inl <= 0))
212 ctx = (BIO_F_BUFFER_CTX *)b->ptr;
213 if ((ctx == NULL) || (b->next_bio == NULL))
216 BIO_clear_retry_flags(b);
218 i = ctx->obuf_size - (ctx->obuf_len + ctx->obuf_off);
219 /* add to buffer and return */
221 memcpy(&(ctx->obuf[ctx->obuf_off + ctx->obuf_len]), in, inl);
222 ctx->obuf_len += inl;
226 /* stuff already in buffer, so add to it first, then flush */
227 if (ctx->obuf_len != 0) {
228 if (i > 0) { /* lets fill it up if we can */
229 memcpy(&(ctx->obuf[ctx->obuf_off + ctx->obuf_len]), in, i);
235 /* we now have a full buffer needing flushing */
237 i = BIO_write(b->next_bio, &(ctx->obuf[ctx->obuf_off]),
240 BIO_copy_next_retry(b);
243 return ((num > 0) ? num : i);
249 if (ctx->obuf_len == 0)
254 * we only get here if the buffer has been flushed and we still have
259 /* we now have inl bytes to write */
260 while (inl >= ctx->obuf_size) {
261 i = BIO_write(b->next_bio, in, inl);
263 BIO_copy_next_retry(b);
265 return ((num > 0) ? num : i);
277 * copy the rest into the buffer since we have only a small amount left
282 static long buffer_ctrl(BIO *b, int cmd, long num, void *ptr)
285 BIO_F_BUFFER_CTX *ctx;
291 ctx = (BIO_F_BUFFER_CTX *)b->ptr;
299 if (b->next_bio == NULL)
301 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
304 ret = (long)ctx->obuf_len;
306 case BIO_C_GET_BUFF_NUM_LINES:
309 for (i = 0; i < ctx->ibuf_len; i++) {
310 if (p1[ctx->ibuf_off + i] == '\n')
314 case BIO_CTRL_WPENDING:
315 ret = (long)ctx->obuf_len;
317 if (b->next_bio == NULL)
319 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
322 case BIO_CTRL_PENDING:
323 ret = (long)ctx->ibuf_len;
325 if (b->next_bio == NULL)
327 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
330 case BIO_C_SET_BUFF_READ_DATA:
331 if (num > ctx->ibuf_size) {
332 p1 = OPENSSL_malloc((int)num);
335 OPENSSL_free(ctx->ibuf);
339 ctx->ibuf_len = (int)num;
340 memcpy(ctx->ibuf, ptr, (int)num);
343 case BIO_C_SET_BUFF_SIZE:
348 obs = ctx->obuf_size;
349 } else { /* if (*ip == 1) */
351 ibs = ctx->ibuf_size;
360 if ((ibs > DEFAULT_BUFFER_SIZE) && (ibs != ctx->ibuf_size)) {
361 p1 = OPENSSL_malloc((int)num);
365 if ((obs > DEFAULT_BUFFER_SIZE) && (obs != ctx->obuf_size)) {
366 p2 = OPENSSL_malloc((int)num);
373 if (ctx->ibuf != p1) {
374 OPENSSL_free(ctx->ibuf);
378 ctx->ibuf_size = ibs;
380 if (ctx->obuf != p2) {
381 OPENSSL_free(ctx->obuf);
385 ctx->obuf_size = obs;
388 case BIO_C_DO_STATE_MACHINE:
389 if (b->next_bio == NULL)
391 BIO_clear_retry_flags(b);
392 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
393 BIO_copy_next_retry(b);
397 if (b->next_bio == NULL)
399 if (ctx->obuf_len <= 0) {
400 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
405 BIO_clear_retry_flags(b);
406 if (ctx->obuf_len > 0) {
407 r = BIO_write(b->next_bio,
408 &(ctx->obuf[ctx->obuf_off]), ctx->obuf_len);
409 BIO_copy_next_retry(b);
421 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
425 if (!BIO_set_read_buffer_size(dbio, ctx->ibuf_size) ||
426 !BIO_set_write_buffer_size(dbio, ctx->obuf_size))
430 if (b->next_bio == NULL)
432 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
437 BIOerr(BIO_F_BUFFER_CTRL, ERR_R_MALLOC_FAILURE);
441 static long buffer_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
445 if (b->next_bio == NULL)
449 ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
455 static int buffer_gets(BIO *b, char *buf, int size)
457 BIO_F_BUFFER_CTX *ctx;
458 int num = 0, i, flag;
461 ctx = (BIO_F_BUFFER_CTX *)b->ptr;
462 size--; /* reserve space for a '\0' */
463 BIO_clear_retry_flags(b);
466 if (ctx->ibuf_len > 0) {
467 p = &(ctx->ibuf[ctx->ibuf_off]);
469 for (i = 0; (i < ctx->ibuf_len) && (i < size); i++) {
481 if (flag || size == 0) {
485 } else { /* read another chunk */
487 i = BIO_read(b->next_bio, ctx->ibuf, ctx->ibuf_size);
489 BIO_copy_next_retry(b);
492 return ((num > 0) ? num : i);
502 static int buffer_puts(BIO *b, const char *str)
504 return (buffer_write(b, str, strlen(str)));