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.]
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;
96 ctx = OPENSSL_malloc(sizeof(BIO_F_BUFFER_CTX));
99 ctx->ibuf = OPENSSL_malloc(DEFAULT_BUFFER_SIZE);
100 if (ctx->ibuf == NULL) {
104 ctx->obuf = OPENSSL_malloc(DEFAULT_BUFFER_SIZE);
105 if (ctx->obuf == NULL) {
106 OPENSSL_free(ctx->ibuf);
110 ctx->ibuf_size = DEFAULT_BUFFER_SIZE;
111 ctx->obuf_size = DEFAULT_BUFFER_SIZE;
118 bi->ptr = (char *)ctx;
123 static int buffer_free(BIO *a)
129 b = (BIO_F_BUFFER_CTX *)a->ptr;
130 OPENSSL_free(b->ibuf);
131 OPENSSL_free(b->obuf);
132 OPENSSL_free(a->ptr);
139 static int buffer_read(BIO *b, char *out, int outl)
142 BIO_F_BUFFER_CTX *ctx;
146 ctx = (BIO_F_BUFFER_CTX *)b->ptr;
148 if ((ctx == NULL) || (b->next_bio == NULL))
151 BIO_clear_retry_flags(b);
155 /* If there is stuff left over, grab it */
159 memcpy(out, &(ctx->ibuf[ctx->ibuf_off]), i);
170 * We may have done a partial read. try to do more. We have nothing in
171 * the buffer. If we get an error and have read some data, just return it
172 * and let them retry to get the error again. copy direct to parent
175 if (outl > ctx->ibuf_size) {
177 i = BIO_read(b->next_bio, out, outl);
179 BIO_copy_next_retry(b);
181 return ((num > 0) ? num : i);
194 /* we are going to be doing some buffering */
195 i = BIO_read(b->next_bio, ctx->ibuf, ctx->ibuf_size);
197 BIO_copy_next_retry(b);
199 return ((num > 0) ? num : i);
206 /* Lets re-read using ourselves :-) */
210 static int buffer_write(BIO *b, const char *in, int inl)
213 BIO_F_BUFFER_CTX *ctx;
215 if ((in == NULL) || (inl <= 0))
217 ctx = (BIO_F_BUFFER_CTX *)b->ptr;
218 if ((ctx == NULL) || (b->next_bio == NULL))
221 BIO_clear_retry_flags(b);
223 i = ctx->obuf_size - (ctx->obuf_len + ctx->obuf_off);
224 /* add to buffer and return */
226 memcpy(&(ctx->obuf[ctx->obuf_off + ctx->obuf_len]), in, inl);
227 ctx->obuf_len += inl;
231 /* stuff already in buffer, so add to it first, then flush */
232 if (ctx->obuf_len != 0) {
233 if (i > 0) { /* lets fill it up if we can */
234 memcpy(&(ctx->obuf[ctx->obuf_off + ctx->obuf_len]), in, i);
240 /* we now have a full buffer needing flushing */
242 i = BIO_write(b->next_bio, &(ctx->obuf[ctx->obuf_off]),
245 BIO_copy_next_retry(b);
248 return ((num > 0) ? num : i);
254 if (ctx->obuf_len == 0)
259 * we only get here if the buffer has been flushed and we still have
264 /* we now have inl bytes to write */
265 while (inl >= ctx->obuf_size) {
266 i = BIO_write(b->next_bio, in, inl);
268 BIO_copy_next_retry(b);
270 return ((num > 0) ? num : i);
282 * copy the rest into the buffer since we have only a small amount left
287 static long buffer_ctrl(BIO *b, int cmd, long num, void *ptr)
290 BIO_F_BUFFER_CTX *ctx;
296 ctx = (BIO_F_BUFFER_CTX *)b->ptr;
304 if (b->next_bio == NULL)
306 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
309 ret = (long)ctx->obuf_len;
311 case BIO_C_GET_BUFF_NUM_LINES:
314 for (i = 0; i < ctx->ibuf_len; i++) {
315 if (p1[ctx->ibuf_off + i] == '\n')
319 case BIO_CTRL_WPENDING:
320 ret = (long)ctx->obuf_len;
322 if (b->next_bio == NULL)
324 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
327 case BIO_CTRL_PENDING:
328 ret = (long)ctx->ibuf_len;
330 if (b->next_bio == NULL)
332 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
335 case BIO_C_SET_BUFF_READ_DATA:
336 if (num > ctx->ibuf_size) {
337 p1 = OPENSSL_malloc((int)num);
340 OPENSSL_free(ctx->ibuf);
344 ctx->ibuf_len = (int)num;
345 memcpy(ctx->ibuf, ptr, (int)num);
348 case BIO_C_SET_BUFF_SIZE:
353 obs = ctx->obuf_size;
354 } else { /* if (*ip == 1) */
356 ibs = ctx->ibuf_size;
365 if ((ibs > DEFAULT_BUFFER_SIZE) && (ibs != ctx->ibuf_size)) {
366 p1 = OPENSSL_malloc((int)num);
370 if ((obs > DEFAULT_BUFFER_SIZE) && (obs != ctx->obuf_size)) {
371 p2 = OPENSSL_malloc((int)num);
378 if (ctx->ibuf != p1) {
379 OPENSSL_free(ctx->ibuf);
383 ctx->ibuf_size = ibs;
385 if (ctx->obuf != p2) {
386 OPENSSL_free(ctx->obuf);
390 ctx->obuf_size = obs;
393 case BIO_C_DO_STATE_MACHINE:
394 if (b->next_bio == NULL)
396 BIO_clear_retry_flags(b);
397 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
398 BIO_copy_next_retry(b);
402 if (b->next_bio == NULL)
404 if (ctx->obuf_len <= 0) {
405 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
410 BIO_clear_retry_flags(b);
411 if (ctx->obuf_len > 0) {
412 r = BIO_write(b->next_bio,
413 &(ctx->obuf[ctx->obuf_off]), ctx->obuf_len);
414 BIO_copy_next_retry(b);
426 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
430 if (!BIO_set_read_buffer_size(dbio, ctx->ibuf_size) ||
431 !BIO_set_write_buffer_size(dbio, ctx->obuf_size))
435 if (b->next_bio == NULL)
437 ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
442 BIOerr(BIO_F_BUFFER_CTRL, ERR_R_MALLOC_FAILURE);
446 static long buffer_callback_ctrl(BIO *b, int cmd, bio_info_cb *fp)
450 if (b->next_bio == NULL)
454 ret = BIO_callback_ctrl(b->next_bio, cmd, fp);
460 static int buffer_gets(BIO *b, char *buf, int size)
462 BIO_F_BUFFER_CTX *ctx;
463 int num = 0, i, flag;
466 ctx = (BIO_F_BUFFER_CTX *)b->ptr;
467 size--; /* reserve space for a '\0' */
468 BIO_clear_retry_flags(b);
471 if (ctx->ibuf_len > 0) {
472 p = &(ctx->ibuf[ctx->ibuf_off]);
474 for (i = 0; (i < ctx->ibuf_len) && (i < size); i++) {
486 if (flag || size == 0) {
490 } else { /* read another chunk */
492 i = BIO_read(b->next_bio, ctx->ibuf, ctx->ibuf_size);
494 BIO_copy_next_retry(b);
497 return ((num > 0) ? num : i);
507 static int buffer_puts(BIO *b, const char *str)
509 return (buffer_write(b, str, strlen(str)));