/src/openssl/crypto/bio/bf_buff.c

Source (jump to first uncovered line)
/*
 * Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the Apache License 2.0 (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */

#include <stdio.h>
#include <errno.h>
#include "bio_local.h"
#include "internal/cryptlib.h"

static int buffer_write(BIO *h, const char *buf, int num);
static int buffer_read(BIO *h, char *buf, int size);
static int buffer_puts(BIO *h, const char *str);
static int buffer_gets(BIO *h, char *str, int size);
static long buffer_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int buffer_new(BIO *h);
static int buffer_free(BIO *data);
static long buffer_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp);
#define DEFAULT_BUFFER_SIZE     4096

static const BIO_METHOD methods_buffer = {
    BIO_TYPE_BUFFER,
    "buffer",
    bwrite_conv,
    buffer_write,
    bread_conv,
    buffer_read,
    buffer_puts,
    buffer_gets,
    buffer_ctrl,
    buffer_new,
    buffer_free,
    buffer_callback_ctrl,
};

const BIO_METHOD *BIO_f_buffer(void)
{
    return &methods_buffer;
}

static int buffer_new(BIO *bi)
{
    BIO_F_BUFFER_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx));

    if (ctx == NULL)
        return 0;
    ctx->ibuf_size = DEFAULT_BUFFER_SIZE;
    ctx->ibuf = OPENSSL_malloc(DEFAULT_BUFFER_SIZE);
    if (ctx->ibuf == NULL) {
        OPENSSL_free(ctx);
        return 0;
    }
    ctx->obuf_size = DEFAULT_BUFFER_SIZE;
    ctx->obuf = OPENSSL_malloc(DEFAULT_BUFFER_SIZE);
    if (ctx->obuf == NULL) {
        OPENSSL_free(ctx->ibuf);
        OPENSSL_free(ctx);
        return 0;
    }

    bi->init = 1;
    bi->ptr = (char *)ctx;
    bi->flags = 0;
    return 1;
}

static int buffer_free(BIO *a)
{
    BIO_F_BUFFER_CTX *b;

    if (a == NULL)
        return 0;
    b = (BIO_F_BUFFER_CTX *)a->ptr;
    OPENSSL_free(b->ibuf);
    OPENSSL_free(b->obuf);
    OPENSSL_free(a->ptr);
    a->ptr = NULL;
    a->init = 0;
    a->flags = 0;
    return 1;
}

static int buffer_read(BIO *b, char *out, int outl)
{
    int i, num = 0;
    BIO_F_BUFFER_CTX *ctx;

    if (out == NULL)
        return 0;
    ctx = (BIO_F_BUFFER_CTX *)b->ptr;

    if ((ctx == NULL) || (b->next_bio == NULL))
        return 0;
    num = 0;
    BIO_clear_retry_flags(b);

 start:
    i = ctx->ibuf_len;
    /* If there is stuff left over, grab it */
    if (i != 0) {
        if (i > outl)
            i = outl;
        memcpy(out, &(ctx->ibuf[ctx->ibuf_off]), i);
        ctx->ibuf_off += i;
        ctx->ibuf_len -= i;
        num += i;
        if (outl == i)
            return num;
        outl -= i;
        out += i;
    }

    /*
     * We may have done a partial read. try to do more. We have nothing in
     * the buffer. If we get an error and have read some data, just return it
     * and let them retry to get the error again. copy direct to parent
     * address space
     */
    if (outl > ctx->ibuf_size) {
        for (;;) {
            i = BIO_read(b->next_bio, out, outl);
            if (i <= 0) {
                BIO_copy_next_retry(b);
                if (i < 0)
                    return ((num > 0) ? num : i);
                if (i == 0)
                    return num;
            }
            num += i;
            if (outl == i)
                return num;
            out += i;
            outl -= i;
        }
    }
    /* else */

    /* we are going to be doing some buffering */
    i = BIO_read(b->next_bio, ctx->ibuf, ctx->ibuf_size);
    if (i <= 0) {
        BIO_copy_next_retry(b);
        if (i < 0)
            return ((num > 0) ? num : i);
        if (i == 0)
            return num;
    }
    ctx->ibuf_off = 0;
    ctx->ibuf_len = i;

    /* Lets re-read using ourselves :-) */
    goto start;
}

static int buffer_write(BIO *b, const char *in, int inl)
{
    int i, num = 0;
    BIO_F_BUFFER_CTX *ctx;

    if ((in == NULL) || (inl <= 0))
        return 0;
    ctx = (BIO_F_BUFFER_CTX *)b->ptr;
    if ((ctx == NULL) || (b->next_bio == NULL))
        return 0;

    BIO_clear_retry_flags(b);
 start:
    i = ctx->obuf_size - (ctx->obuf_len + ctx->obuf_off);
    /* add to buffer and return */
    if (i >= inl) {
        memcpy(&(ctx->obuf[ctx->obuf_off + ctx->obuf_len]), in, inl);
        ctx->obuf_len += inl;
        return (num + inl);
    }
    /* else */
    /* stuff already in buffer, so add to it first, then flush */
    if (ctx->obuf_len != 0) {
        if (i > 0) {            /* lets fill it up if we can */
            memcpy(&(ctx->obuf[ctx->obuf_off + ctx->obuf_len]), in, i);
            in += i;
            inl -= i;
            num += i;
            ctx->obuf_len += i;
        }
        /* we now have a full buffer needing flushing */
        for (;;) {
            i = BIO_write(b->next_bio, &(ctx->obuf[ctx->obuf_off]),
                          ctx->obuf_len);
            if (i <= 0) {
                BIO_copy_next_retry(b);

                if (i < 0)
                    return ((num > 0) ? num : i);
                if (i == 0)
                    return num;
            }
            ctx->obuf_off += i;
            ctx->obuf_len -= i;
            if (ctx->obuf_len == 0)
                break;
        }
    }
    /*
     * we only get here if the buffer has been flushed and we still have
     * stuff to write
     */
    ctx->obuf_off = 0;

    /* we now have inl bytes to write */
    while (inl >= ctx->obuf_size) {
        i = BIO_write(b->next_bio, in, inl);
        if (i <= 0) {
            BIO_copy_next_retry(b);
            if (i < 0)
                return ((num > 0) ? num : i);
            if (i == 0)
                return num;
        }
        num += i;
        in += i;
        inl -= i;
        if (inl == 0)
            return num;
    }

    /*
     * copy the rest into the buffer since we have only a small amount left
     */
    goto start;
}

static long buffer_ctrl(BIO *b, int cmd, long num, void *ptr)
{
    BIO *dbio;
    BIO_F_BUFFER_CTX *ctx;
    long ret = 1;
    char *p1, *p2;
    int r, i, *ip;
    int ibs, obs;

    ctx = (BIO_F_BUFFER_CTX *)b->ptr;

    switch (cmd) {
    case BIO_CTRL_RESET:
        ctx->ibuf_off = 0;
        ctx->ibuf_len = 0;
        ctx->obuf_off = 0;
        ctx->obuf_len = 0;
        if (b->next_bio == NULL)
            return 0;
        ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
        break;
    case BIO_CTRL_EOF:
        if (ctx->ibuf_len > 0)
            return 0;
        ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
        break;
    case BIO_CTRL_INFO:
        ret = (long)ctx->obuf_len;
        break;
    case BIO_C_GET_BUFF_NUM_LINES:
        ret = 0;
        p1 = ctx->ibuf;
        for (i = 0; i < ctx->ibuf_len; i++) {
            if (p1[ctx->ibuf_off + i] == '\n')
                ret++;
        }
        break;
    case BIO_CTRL_WPENDING:
        ret = (long)ctx->obuf_len;
        if (ret == 0) {
            if (b->next_bio == NULL)
                return 0;
            ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
        }
        break;
    case BIO_CTRL_PENDING:
        ret = (long)ctx->ibuf_len;
        if (ret == 0) {
            if (b->next_bio == NULL)
                return 0;
            ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
        }
        break;
    case BIO_C_SET_BUFF_READ_DATA:
        if (num > ctx->ibuf_size) {
            if (num <= 0)
                return 0;
            p1 = OPENSSL_malloc((size_t)num);
            if (p1 == NULL)
                return 0;
            OPENSSL_free(ctx->ibuf);
            ctx->ibuf = p1;
        }
        ctx->ibuf_off = 0;
        ctx->ibuf_len = (int)num;
        memcpy(ctx->ibuf, ptr, (int)num);
        ret = 1;
        break;
    case BIO_C_SET_BUFF_SIZE:
        if (ptr != NULL) {
            ip = (int *)ptr;
            if (*ip == 0) {
                ibs = (int)num;
                obs = ctx->obuf_size;
            } else {            /* if (*ip == 1) */

                ibs = ctx->ibuf_size;
                obs = (int)num;
            }
        } else {
            ibs = (int)num;
            obs = (int)num;
        }
        p1 = ctx->ibuf;
        p2 = ctx->obuf;
        if ((ibs > DEFAULT_BUFFER_SIZE) && (ibs != ctx->ibuf_size)) {
            if (num <= 0)
                return 0;
            p1 = OPENSSL_malloc((size_t)num);
            if (p1 == NULL)
                return 0;
        }
        if ((obs > DEFAULT_BUFFER_SIZE) && (obs != ctx->obuf_size)) {
            p2 = OPENSSL_malloc((size_t)num);
            if (p2 == NULL) {
                if (p1 != ctx->ibuf)
                    OPENSSL_free(p1);
                return 0;
            }
        }
        if (ctx->ibuf != p1) {
            OPENSSL_free(ctx->ibuf);
            ctx->ibuf = p1;
            ctx->ibuf_off = 0;
            ctx->ibuf_len = 0;
            ctx->ibuf_size = ibs;
        }
        if (ctx->obuf != p2) {
            OPENSSL_free(ctx->obuf);
            ctx->obuf = p2;
            ctx->obuf_off = 0;
            ctx->obuf_len = 0;
            ctx->obuf_size = obs;
        }
        break;
    case BIO_C_DO_STATE_MACHINE:
        if (b->next_bio == NULL)
            return 0;
        BIO_clear_retry_flags(b);
        ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
        BIO_copy_next_retry(b);
        break;

    case BIO_CTRL_FLUSH:
        if (b->next_bio == NULL)
            return 0;
        if (ctx->obuf_len <= 0) {
            ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
            BIO_copy_next_retry(b);
            break;
        }

        for (;;) {
            BIO_clear_retry_flags(b);
            if (ctx->obuf_len > 0) {
                r = BIO_write(b->next_bio,
                              &(ctx->obuf[ctx->obuf_off]), ctx->obuf_len);
                BIO_copy_next_retry(b);
                if (r <= 0)
                    return (long)r;
                ctx->obuf_off += r;
                ctx->obuf_len -= r;
            } else {
                ctx->obuf_len = 0;
                ctx->obuf_off = 0;
                break;
            }
        }
        ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
        BIO_copy_next_retry(b);
        break;
    case BIO_CTRL_DUP:
        dbio = (BIO *)ptr;
        if (BIO_set_read_buffer_size(dbio, ctx->ibuf_size) <= 0 ||
            BIO_set_write_buffer_size(dbio, ctx->obuf_size) <= 0)
            ret = 0;
        break;
    case BIO_CTRL_PEEK:
        /* Ensure there's stuff in the input buffer */
        {
            char fake_buf[1];
            (void)buffer_read(b, fake_buf, 0);
        }
        if (num > ctx->ibuf_len)
            num = ctx->ibuf_len;
        memcpy(ptr, &(ctx->ibuf[ctx->ibuf_off]), num);
        ret = num;
        break;
    default:
        if (b->next_bio == NULL)
            return 0;
        ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
        break;
    }
    return ret;
}

static long buffer_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
{
    if (b->next_bio == NULL)
        return 0;
    return BIO_callback_ctrl(b->next_bio, cmd, fp);
}

static int buffer_gets(BIO *b, char *buf, int size)
{
    BIO_F_BUFFER_CTX *ctx;
    int num = 0, i, flag;
    char *p;

    ctx = (BIO_F_BUFFER_CTX *)b->ptr;
    size--;                     /* reserve space for a '\0' */
    BIO_clear_retry_flags(b);

    for (;;) {
        if (ctx->ibuf_len > 0) {
            p = &(ctx->ibuf[ctx->ibuf_off]);
            flag = 0;
            for (i = 0; (i < ctx->ibuf_len) && (i < size); i++) {
                *(buf++) = p[i];
                if (p[i] == '\n') {
                    flag = 1;
                    i++;
                    break;
                }
            }
            num += i;
            size -= i;
            ctx->ibuf_len -= i;
            ctx->ibuf_off += i;
            if (flag || size == 0) {
                *buf = '\0';
                return num;
            }
        } else {                /* read another chunk */

            i = BIO_read(b->next_bio, ctx->ibuf, ctx->ibuf_size);
            if (i <= 0) {
                BIO_copy_next_retry(b);
                *buf = '\0';
                if (i < 0)
                    return ((num > 0) ? num : i);
                if (i == 0)
                    return num;
            }
            ctx->ibuf_len = i;
            ctx->ibuf_off = 0;
        }
    }
}

static int buffer_puts(BIO *b, const char *str)
{
    return buffer_write(b, str, strlen(str));
}

Coverage Report

Created: 2025-06-13 06:36

Line	Count	Source (jump to first uncovered line)
1		/*
2		* Copyright 1995-2023 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 <errno.h>
12		#include "bio_local.h"
13		#include "internal/cryptlib.h"
14
15		static int buffer_write(BIO h, const char buf, int num);
16		static int buffer_read(BIO h, char buf, int size);
17		static int buffer_puts(BIO h, const char str);
18		static int buffer_gets(BIO h, char str, int size);
19		static long buffer_ctrl(BIO h, int cmd, long arg1, void arg2);
20		static int buffer_new(BIO *h);
21		static int buffer_free(BIO *data);
22		static long buffer_callback_ctrl(BIO h, int cmd, BIO_info_cb fp);
23	0	#define DEFAULT_BUFFER_SIZE 4096
24
25		static const BIO_METHOD methods_buffer = {
26		BIO_TYPE_BUFFER,
27		"buffer",
28		bwrite_conv,
29		buffer_write,
30		bread_conv,
31		buffer_read,
32		buffer_puts,
33		buffer_gets,
34		buffer_ctrl,
35		buffer_new,
36		buffer_free,
37		buffer_callback_ctrl,
38		};
39
40		const BIO_METHOD *BIO_f_buffer(void)
41	0	{
42	0	return &methods_buffer;
43	0	}
44
45		static int buffer_new(BIO *bi)
46	0	{
47	0	BIO_F_BUFFER_CTX ctx = OPENSSL_zalloc(sizeof(ctx));
48
49	0	if (ctx == NULL)
50	0	return 0;
51	0	ctx->ibuf_size = DEFAULT_BUFFER_SIZE;
52	0	ctx->ibuf = OPENSSL_malloc(DEFAULT_BUFFER_SIZE);
53	0	if (ctx->ibuf == NULL) {
54	0	OPENSSL_free(ctx);
55	0	return 0;
56	0	}
57	0	ctx->obuf_size = DEFAULT_BUFFER_SIZE;
58	0	ctx->obuf = OPENSSL_malloc(DEFAULT_BUFFER_SIZE);
59	0	if (ctx->obuf == NULL) {
60	0	OPENSSL_free(ctx->ibuf);
61	0	OPENSSL_free(ctx);
62	0	return 0;
63	0	}
64
65	0	bi->init = 1;
66	0	bi->ptr = (char *)ctx;
67	0	bi->flags = 0;
68	0	return 1;
69	0	}
70
71		static int buffer_free(BIO *a)
72	0	{
73	0	BIO_F_BUFFER_CTX *b;
74
75	0	if (a == NULL)
76	0	return 0;
77	0	b = (BIO_F_BUFFER_CTX *)a->ptr;
78	0	OPENSSL_free(b->ibuf);
79	0	OPENSSL_free(b->obuf);
80	0	OPENSSL_free(a->ptr);
81	0	a->ptr = NULL;
82	0	a->init = 0;
83	0	a->flags = 0;
84	0	return 1;
85	0	}
86
87		static int buffer_read(BIO b, char out, int outl)
88	0	{
89	0	int i, num = 0;
90	0	BIO_F_BUFFER_CTX *ctx;
91
92	0	if (out == NULL)
93	0	return 0;
94	0	ctx = (BIO_F_BUFFER_CTX *)b->ptr;
95
96	0	if ((ctx == NULL) \|\| (b->next_bio == NULL))
97	0	return 0;
98	0	num = 0;
99	0	BIO_clear_retry_flags(b);
100
101	0	start:
102	0	i = ctx->ibuf_len;
103		/* If there is stuff left over, grab it */
104	0	if (i != 0) {
105	0	if (i > outl)
106	0	i = outl;
107	0	memcpy(out, &(ctx->ibuf[ctx->ibuf_off]), i);
108	0	ctx->ibuf_off += i;
109	0	ctx->ibuf_len -= i;
110	0	num += i;
111	0	if (outl == i)
112	0	return num;
113	0	outl -= i;
114	0	out += i;
115	0	}
116
117		/*
118		* We may have done a partial read. try to do more. We have nothing in
119		* the buffer. If we get an error and have read some data, just return it
120		* and let them retry to get the error again. copy direct to parent
121		* address space
122		*/
123	0	if (outl > ctx->ibuf_size) {
124	0	for (;;) {
125	0	i = BIO_read(b->next_bio, out, outl);
126	0	if (i <= 0) {
127	0	BIO_copy_next_retry(b);
128	0	if (i < 0)
129	0	return ((num > 0) ? num : i);
130	0	if (i == 0)
131	0	return num;
132	0	}
133	0	num += i;
134	0	if (outl == i)
135	0	return num;
136	0	out += i;
137	0	outl -= i;
138	0	}
139	0	}
140		/* else */
141
142		/* we are going to be doing some buffering */
143	0	i = BIO_read(b->next_bio, ctx->ibuf, ctx->ibuf_size);
144	0	if (i <= 0) {
145	0	BIO_copy_next_retry(b);
146	0	if (i < 0)
147	0	return ((num > 0) ? num : i);
148	0	if (i == 0)
149	0	return num;
150	0	}
151	0	ctx->ibuf_off = 0;
152	0	ctx->ibuf_len = i;
153
154		/* Lets re-read using ourselves :-) */
155	0	goto start;
156	0	}
157
158		static int buffer_write(BIO b, const char in, int inl)
159	0	{
160	0	int i, num = 0;
161	0	BIO_F_BUFFER_CTX *ctx;
162
163	0	if ((in == NULL) \|\| (inl <= 0))
164	0	return 0;
165	0	ctx = (BIO_F_BUFFER_CTX *)b->ptr;
166	0	if ((ctx == NULL) \|\| (b->next_bio == NULL))
167	0	return 0;
168
169	0	BIO_clear_retry_flags(b);
170	0	start:
171	0	i = ctx->obuf_size - (ctx->obuf_len + ctx->obuf_off);
172		/* add to buffer and return */
173	0	if (i >= inl) {
174	0	memcpy(&(ctx->obuf[ctx->obuf_off + ctx->obuf_len]), in, inl);
175	0	ctx->obuf_len += inl;
176	0	return (num + inl);
177	0	}
178		/* else */
179		/* stuff already in buffer, so add to it first, then flush */
180	0	if (ctx->obuf_len != 0) {
181	0	if (i > 0) { /* lets fill it up if we can */
182	0	memcpy(&(ctx->obuf[ctx->obuf_off + ctx->obuf_len]), in, i);
183	0	in += i;
184	0	inl -= i;
185	0	num += i;
186	0	ctx->obuf_len += i;
187	0	}
188		/* we now have a full buffer needing flushing */
189	0	for (;;) {
190	0	i = BIO_write(b->next_bio, &(ctx->obuf[ctx->obuf_off]),
191	0	ctx->obuf_len);
192	0	if (i <= 0) {
193	0	BIO_copy_next_retry(b);
194
195	0	if (i < 0)
196	0	return ((num > 0) ? num : i);
197	0	if (i == 0)
198	0	return num;
199	0	}
200	0	ctx->obuf_off += i;
201	0	ctx->obuf_len -= i;
202	0	if (ctx->obuf_len == 0)
203	0	break;
204	0	}
205	0	}
206		/*
207		* we only get here if the buffer has been flushed and we still have
208		* stuff to write
209		*/
210	0	ctx->obuf_off = 0;
211
212		/* we now have inl bytes to write */
213	0	while (inl >= ctx->obuf_size) {
214	0	i = BIO_write(b->next_bio, in, inl);
215	0	if (i <= 0) {
216	0	BIO_copy_next_retry(b);
217	0	if (i < 0)
218	0	return ((num > 0) ? num : i);
219	0	if (i == 0)
220	0	return num;
221	0	}
222	0	num += i;
223	0	in += i;
224	0	inl -= i;
225	0	if (inl == 0)
226	0	return num;
227	0	}
228
229		/*
230		* copy the rest into the buffer since we have only a small amount left
231		*/
232	0	goto start;
233	0	}
234
235		static long buffer_ctrl(BIO b, int cmd, long num, void ptr)
236	0	{
237	0	BIO *dbio;
238	0	BIO_F_BUFFER_CTX *ctx;
239	0	long ret = 1;
240	0	char p1, p2;
241	0	int r, i, *ip;
242	0	int ibs, obs;
243
244	0	ctx = (BIO_F_BUFFER_CTX *)b->ptr;
245
246	0	switch (cmd) {
247	0	case BIO_CTRL_RESET:
248	0	ctx->ibuf_off = 0;
249	0	ctx->ibuf_len = 0;
250	0	ctx->obuf_off = 0;
251	0	ctx->obuf_len = 0;
252	0	if (b->next_bio == NULL)
253	0	return 0;
254	0	ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
255	0	break;
256	0	case BIO_CTRL_EOF:
257	0	if (ctx->ibuf_len > 0)
258	0	return 0;
259	0	ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
260	0	break;
261	0	case BIO_CTRL_INFO:
262	0	ret = (long)ctx->obuf_len;
263	0	break;
264	0	case BIO_C_GET_BUFF_NUM_LINES:
265	0	ret = 0;
266	0	p1 = ctx->ibuf;
267	0	for (i = 0; i < ctx->ibuf_len; i++) {
268	0	if (p1[ctx->ibuf_off + i] == '\n')
269	0	ret++;
270	0	}
271	0	break;
272	0	case BIO_CTRL_WPENDING:
273	0	ret = (long)ctx->obuf_len;
274	0	if (ret == 0) {
275	0	if (b->next_bio == NULL)
276	0	return 0;
277	0	ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
278	0	}
279	0	break;
280	0	case BIO_CTRL_PENDING:
281	0	ret = (long)ctx->ibuf_len;
282	0	if (ret == 0) {
283	0	if (b->next_bio == NULL)
284	0	return 0;
285	0	ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
286	0	}
287	0	break;
288	0	case BIO_C_SET_BUFF_READ_DATA:
289	0	if (num > ctx->ibuf_size) {
290	0	if (num <= 0)
291	0	return 0;
292	0	p1 = OPENSSL_malloc((size_t)num);
293	0	if (p1 == NULL)
294	0	return 0;
295	0	OPENSSL_free(ctx->ibuf);
296	0	ctx->ibuf = p1;
297	0	}
298	0	ctx->ibuf_off = 0;
299	0	ctx->ibuf_len = (int)num;
300	0	memcpy(ctx->ibuf, ptr, (int)num);
301	0	ret = 1;
302	0	break;
303	0	case BIO_C_SET_BUFF_SIZE:
304	0	if (ptr != NULL) {
305	0	ip = (int *)ptr;
306	0	if (*ip == 0) {
307	0	ibs = (int)num;
308	0	obs = ctx->obuf_size;
309	0	} else { /* if (ip == 1) /
310
311	0	ibs = ctx->ibuf_size;
312	0	obs = (int)num;
313	0	}
314	0	} else {
315	0	ibs = (int)num;
316	0	obs = (int)num;
317	0	}
318	0	p1 = ctx->ibuf;
319	0	p2 = ctx->obuf;
320	0	if ((ibs > DEFAULT_BUFFER_SIZE) && (ibs != ctx->ibuf_size)) {
321	0	if (num <= 0)
322	0	return 0;
323	0	p1 = OPENSSL_malloc((size_t)num);
324	0	if (p1 == NULL)
325	0	return 0;
326	0	}
327	0	if ((obs > DEFAULT_BUFFER_SIZE) && (obs != ctx->obuf_size)) {
328	0	p2 = OPENSSL_malloc((size_t)num);
329	0	if (p2 == NULL) {
330	0	if (p1 != ctx->ibuf)
331	0	OPENSSL_free(p1);
332	0	return 0;
333	0	}
334	0	}
335	0	if (ctx->ibuf != p1) {
336	0	OPENSSL_free(ctx->ibuf);
337	0	ctx->ibuf = p1;
338	0	ctx->ibuf_off = 0;
339	0	ctx->ibuf_len = 0;
340	0	ctx->ibuf_size = ibs;
341	0	}
342	0	if (ctx->obuf != p2) {
343	0	OPENSSL_free(ctx->obuf);
344	0	ctx->obuf = p2;
345	0	ctx->obuf_off = 0;
346	0	ctx->obuf_len = 0;
347	0	ctx->obuf_size = obs;
348	0	}
349	0	break;
350	0	case BIO_C_DO_STATE_MACHINE:
351	0	if (b->next_bio == NULL)
352	0	return 0;
353	0	BIO_clear_retry_flags(b);
354	0	ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
355	0	BIO_copy_next_retry(b);
356	0	break;
357
358	0	case BIO_CTRL_FLUSH:
359	0	if (b->next_bio == NULL)
360	0	return 0;
361	0	if (ctx->obuf_len <= 0) {
362	0	ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
363	0	BIO_copy_next_retry(b);
364	0	break;
365	0	}
366
367	0	for (;;) {
368	0	BIO_clear_retry_flags(b);
369	0	if (ctx->obuf_len > 0) {
370	0	r = BIO_write(b->next_bio,
371	0	&(ctx->obuf[ctx->obuf_off]), ctx->obuf_len);
372	0	BIO_copy_next_retry(b);
373	0	if (r <= 0)
374	0	return (long)r;
375	0	ctx->obuf_off += r;
376	0	ctx->obuf_len -= r;
377	0	} else {
378	0	ctx->obuf_len = 0;
379	0	ctx->obuf_off = 0;
380	0	break;
381	0	}
382	0	}
383	0	ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
384	0	BIO_copy_next_retry(b);
385	0	break;
386	0	case BIO_CTRL_DUP:
387	0	dbio = (BIO *)ptr;
388	0	if (BIO_set_read_buffer_size(dbio, ctx->ibuf_size) <= 0 \|\|
389	0	BIO_set_write_buffer_size(dbio, ctx->obuf_size) <= 0)
390	0	ret = 0;
391	0	break;
392	0	case BIO_CTRL_PEEK:
393		/* Ensure there's stuff in the input buffer */
394	0	{
395	0	char fake_buf[1];
396	0	(void)buffer_read(b, fake_buf, 0);
397	0	}
398	0	if (num > ctx->ibuf_len)
399	0	num = ctx->ibuf_len;
400	0	memcpy(ptr, &(ctx->ibuf[ctx->ibuf_off]), num);
401	0	ret = num;
402	0	break;
403	0	default:
404	0	if (b->next_bio == NULL)
405	0	return 0;
406	0	ret = BIO_ctrl(b->next_bio, cmd, num, ptr);
407	0	break;
408	0	}
409	0	return ret;
410	0	}
411
412		static long buffer_callback_ctrl(BIO b, int cmd, BIO_info_cb fp)
413	0	{
414	0	if (b->next_bio == NULL)
415	0	return 0;
416	0	return BIO_callback_ctrl(b->next_bio, cmd, fp);
417	0	}
418
419		static int buffer_gets(BIO b, char buf, int size)
420	0	{
421	0	BIO_F_BUFFER_CTX *ctx;
422	0	int num = 0, i, flag;
423	0	char *p;
424
425	0	ctx = (BIO_F_BUFFER_CTX *)b->ptr;
426	0	size--; /* reserve space for a '\0' */
427	0	BIO_clear_retry_flags(b);
428
429	0	for (;;) {
430	0	if (ctx->ibuf_len > 0) {
431	0	p = &(ctx->ibuf[ctx->ibuf_off]);
432	0	flag = 0;
433	0	for (i = 0; (i < ctx->ibuf_len) && (i < size); i++) {
434	0	*(buf++) = p[i];
435	0	if (p[i] == '\n') {
436	0	flag = 1;
437	0	i++;
438	0	break;
439	0	}
440	0	}
441	0	num += i;
442	0	size -= i;
443	0	ctx->ibuf_len -= i;
444	0	ctx->ibuf_off += i;
445	0	if (flag \|\| size == 0) {
446	0	*buf = '\0';
447	0	return num;
448	0	}
449	0	} else { /* read another chunk */
450
451	0	i = BIO_read(b->next_bio, ctx->ibuf, ctx->ibuf_size);
452	0	if (i <= 0) {
453	0	BIO_copy_next_retry(b);
454	0	*buf = '\0';
455	0	if (i < 0)
456	0	return ((num > 0) ? num : i);
457	0	if (i == 0)
458	0	return num;
459	0	}
460	0	ctx->ibuf_len = i;
461	0	ctx->ibuf_off = 0;
462	0	}
463	0	}
464	0	}
465
466		static int buffer_puts(BIO b, const char str)
467	0	{
468	0	return buffer_write(b, str, strlen(str));
469	0	}