/src/openssl33/crypto/asn1/bio_asn1.c

Source
/*
 * Copyright 2006-2021 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
 */

/*
 * Experimental ASN1 BIO. When written through the data is converted to an
 * ASN1 string type: default is OCTET STRING. Additional functions can be
 * provided to add prefix and suffix data.
 */

#include <string.h>
#include "internal/bio.h"
#include <openssl/asn1.h>
#include "internal/cryptlib.h"

/* Must be large enough for biggest tag+length */
#define DEFAULT_ASN1_BUF_SIZE 20

typedef enum {
    ASN1_STATE_START,
    ASN1_STATE_PRE_COPY,
    ASN1_STATE_HEADER,
    ASN1_STATE_HEADER_COPY,
    ASN1_STATE_DATA_COPY,
    ASN1_STATE_POST_COPY,
    ASN1_STATE_DONE
} asn1_bio_state_t;

typedef struct BIO_ASN1_EX_FUNCS_st {
    asn1_ps_func *ex_func;
    asn1_ps_func *ex_free_func;
} BIO_ASN1_EX_FUNCS;

typedef struct BIO_ASN1_BUF_CTX_t {
    /* Internal state */
    asn1_bio_state_t state;
    /* Internal buffer */
    unsigned char *buf;
    /* Size of buffer */
    int bufsize;
    /* Current position in buffer */
    int bufpos;
    /* Current buffer length */
    int buflen;
    /* Amount of data to copy */
    int copylen;
    /* Class and tag to use */
    int asn1_class, asn1_tag;
    asn1_ps_func *prefix, *prefix_free, *suffix, *suffix_free;
    /* Extra buffer for prefix and suffix data */
    unsigned char *ex_buf;
    int ex_len;
    int ex_pos;
    void *ex_arg;
} BIO_ASN1_BUF_CTX;

static int asn1_bio_write(BIO *h, const char *buf, int num);
static int asn1_bio_read(BIO *h, char *buf, int size);
static int asn1_bio_puts(BIO *h, const char *str);
static int asn1_bio_gets(BIO *h, char *str, int size);
static long asn1_bio_ctrl(BIO *h, int cmd, long arg1, void *arg2);
static int asn1_bio_new(BIO *h);
static int asn1_bio_free(BIO *data);
static long asn1_bio_callback_ctrl(BIO *h, int cmd, BIO_info_cb *fp);

static int asn1_bio_init(BIO_ASN1_BUF_CTX *ctx, int size);
static int asn1_bio_flush_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx,
    asn1_ps_func *cleanup, asn1_bio_state_t next);
static int asn1_bio_setup_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx,
    asn1_ps_func *setup,
    asn1_bio_state_t ex_state,
    asn1_bio_state_t other_state);

static const BIO_METHOD methods_asn1 = {
    BIO_TYPE_ASN1,
    "asn1",
    bwrite_conv,
    asn1_bio_write,
    bread_conv,
    asn1_bio_read,
    asn1_bio_puts,
    asn1_bio_gets,
    asn1_bio_ctrl,
    asn1_bio_new,
    asn1_bio_free,
    asn1_bio_callback_ctrl,
};

const BIO_METHOD *BIO_f_asn1(void)
{
    return &methods_asn1;
}

static int asn1_bio_new(BIO *b)
{
    BIO_ASN1_BUF_CTX *ctx = OPENSSL_zalloc(sizeof(*ctx));

    if (ctx == NULL)
        return 0;
    if (!asn1_bio_init(ctx, DEFAULT_ASN1_BUF_SIZE)) {
        OPENSSL_free(ctx);
        return 0;
    }
    BIO_set_data(b, ctx);
    BIO_set_init(b, 1);

    return 1;
}

static int asn1_bio_init(BIO_ASN1_BUF_CTX *ctx, int size)
{
    if (size <= 0) {
        ERR_raise(ERR_LIB_ASN1, ERR_R_PASSED_INVALID_ARGUMENT);
        return 0;
    }
    if ((ctx->buf = OPENSSL_malloc(size)) == NULL)
        return 0;
    ctx->bufsize = size;
    ctx->asn1_class = V_ASN1_UNIVERSAL;
    ctx->asn1_tag = V_ASN1_OCTET_STRING;
    ctx->state = ASN1_STATE_START;
    return 1;
}

static int asn1_bio_free(BIO *b)
{
    BIO_ASN1_BUF_CTX *ctx;

    if (b == NULL)
        return 0;

    ctx = BIO_get_data(b);
    if (ctx == NULL)
        return 0;

    if (ctx->prefix_free != NULL)
        ctx->prefix_free(b, &ctx->ex_buf, &ctx->ex_len, &ctx->ex_arg);
    if (ctx->suffix_free != NULL)
        ctx->suffix_free(b, &ctx->ex_buf, &ctx->ex_len, &ctx->ex_arg);

    OPENSSL_free(ctx->buf);
    OPENSSL_free(ctx);
    BIO_set_data(b, NULL);
    BIO_set_init(b, 0);

    return 1;
}

static int asn1_bio_write(BIO *b, const char *in, int inl)
{
    BIO_ASN1_BUF_CTX *ctx;
    int wrmax, wrlen, ret;
    unsigned char *p;
    BIO *next;

    ctx = BIO_get_data(b);
    next = BIO_next(b);
    if (in == NULL || inl < 0 || ctx == NULL || next == NULL)
        return 0;

    wrlen = 0;
    ret = -1;

    for (;;) {
        switch (ctx->state) {
            /* Setup prefix data, call it */
        case ASN1_STATE_START:
            if (!asn1_bio_setup_ex(b, ctx, ctx->prefix,
                    ASN1_STATE_PRE_COPY, ASN1_STATE_HEADER))
                return -1;
            break;

            /* Copy any pre data first */
        case ASN1_STATE_PRE_COPY:

            ret = asn1_bio_flush_ex(b, ctx, ctx->prefix_free,
                ASN1_STATE_HEADER);

            if (ret <= 0)
                goto done;

            break;

        case ASN1_STATE_HEADER:
            ctx->buflen = ASN1_object_size(0, inl, ctx->asn1_tag) - inl;
            if (!ossl_assert(ctx->buflen <= ctx->bufsize))
                return -1;
            p = ctx->buf;
            ASN1_put_object(&p, 0, inl, ctx->asn1_tag, ctx->asn1_class);
            ctx->copylen = inl;
            ctx->state = ASN1_STATE_HEADER_COPY;

            break;

        case ASN1_STATE_HEADER_COPY:
            ret = BIO_write(next, ctx->buf + ctx->bufpos, ctx->buflen);
            if (ret <= 0)
                goto done;

            ctx->buflen -= ret;
            if (ctx->buflen)
                ctx->bufpos += ret;
            else {
                ctx->bufpos = 0;
                ctx->state = ASN1_STATE_DATA_COPY;
            }

            break;

        case ASN1_STATE_DATA_COPY:

            if (inl > ctx->copylen)
                wrmax = ctx->copylen;
            else
                wrmax = inl;
            ret = BIO_write(next, in, wrmax);
            if (ret <= 0)
                goto done;
            wrlen += ret;
            ctx->copylen -= ret;
            in += ret;
            inl -= ret;

            if (ctx->copylen == 0)
                ctx->state = ASN1_STATE_HEADER;

            if (inl == 0)
                goto done;

            break;

        case ASN1_STATE_POST_COPY:
        case ASN1_STATE_DONE:
            BIO_clear_retry_flags(b);
            return 0;
        }
    }

done:
    BIO_clear_retry_flags(b);
    BIO_copy_next_retry(b);

    return (wrlen > 0) ? wrlen : ret;
}

static int asn1_bio_flush_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx,
    asn1_ps_func *cleanup, asn1_bio_state_t next)
{
    int ret;

    if (ctx->ex_len <= 0)
        return 1;
    for (;;) {
        ret = BIO_write(BIO_next(b), ctx->ex_buf + ctx->ex_pos, ctx->ex_len);
        if (ret <= 0)
            break;
        ctx->ex_len -= ret;
        if (ctx->ex_len > 0)
            ctx->ex_pos += ret;
        else {
            if (cleanup)
                cleanup(b, &ctx->ex_buf, &ctx->ex_len, &ctx->ex_arg);
            ctx->state = next;
            ctx->ex_pos = 0;
            break;
        }
    }
    return ret;
}

static int asn1_bio_setup_ex(BIO *b, BIO_ASN1_BUF_CTX *ctx,
    asn1_ps_func *setup,
    asn1_bio_state_t ex_state,
    asn1_bio_state_t other_state)
{
    if (setup && !setup(b, &ctx->ex_buf, &ctx->ex_len, &ctx->ex_arg)) {
        BIO_clear_retry_flags(b);
        return 0;
    }
    if (ctx->ex_len > 0)
        ctx->state = ex_state;
    else
        ctx->state = other_state;
    return 1;
}

static int asn1_bio_read(BIO *b, char *in, int inl)
{
    BIO *next = BIO_next(b);
    if (next == NULL)
        return 0;
    return BIO_read(next, in, inl);
}

static int asn1_bio_puts(BIO *b, const char *str)
{
    return asn1_bio_write(b, str, strlen(str));
}

static int asn1_bio_gets(BIO *b, char *str, int size)
{
    BIO *next = BIO_next(b);
    if (next == NULL)
        return 0;
    return BIO_gets(next, str, size);
}

static long asn1_bio_callback_ctrl(BIO *b, int cmd, BIO_info_cb *fp)
{
    BIO *next = BIO_next(b);
    if (next == NULL)
        return 0;
    return BIO_callback_ctrl(next, cmd, fp);
}

static long asn1_bio_ctrl(BIO *b, int cmd, long arg1, void *arg2)
{
    BIO_ASN1_BUF_CTX *ctx;
    BIO_ASN1_EX_FUNCS *ex_func;
    long ret = 1;
    BIO *next;

    ctx = BIO_get_data(b);
    if (ctx == NULL)
        return 0;
    next = BIO_next(b);
    switch (cmd) {

    case BIO_C_SET_PREFIX:
        ex_func = arg2;
        ctx->prefix = ex_func->ex_func;
        ctx->prefix_free = ex_func->ex_free_func;
        break;

    case BIO_C_GET_PREFIX:
        ex_func = arg2;
        ex_func->ex_func = ctx->prefix;
        ex_func->ex_free_func = ctx->prefix_free;
        break;

    case BIO_C_SET_SUFFIX:
        ex_func = arg2;
        ctx->suffix = ex_func->ex_func;
        ctx->suffix_free = ex_func->ex_free_func;
        break;

    case BIO_C_GET_SUFFIX:
        ex_func = arg2;
        ex_func->ex_func = ctx->suffix;
        ex_func->ex_free_func = ctx->suffix_free;
        break;

    case BIO_C_SET_EX_ARG:
        ctx->ex_arg = arg2;
        break;

    case BIO_C_GET_EX_ARG:
        *(void **)arg2 = ctx->ex_arg;
        break;

    case BIO_CTRL_FLUSH:
        if (next == NULL)
            return 0;

        /* Call post function if possible */
        if (ctx->state == ASN1_STATE_HEADER) {
            if (!asn1_bio_setup_ex(b, ctx, ctx->suffix,
                    ASN1_STATE_POST_COPY, ASN1_STATE_DONE))
                return 0;
        }

        if (ctx->state == ASN1_STATE_POST_COPY) {
            ret = asn1_bio_flush_ex(b, ctx, ctx->suffix_free,
                ASN1_STATE_DONE);
            if (ret <= 0)
                return ret;
        }

        if (ctx->state == ASN1_STATE_DONE)
            return BIO_ctrl(next, cmd, arg1, arg2);
        else {
            BIO_clear_retry_flags(b);
            return 0;
        }

    default:
        if (next == NULL)
            return 0;
        return BIO_ctrl(next, cmd, arg1, arg2);
    }

    return ret;
}

static int asn1_bio_set_ex(BIO *b, int cmd,
    asn1_ps_func *ex_func, asn1_ps_func *ex_free_func)
{
    BIO_ASN1_EX_FUNCS extmp;
    extmp.ex_func = ex_func;
    extmp.ex_free_func = ex_free_func;
    return BIO_ctrl(b, cmd, 0, &extmp);
}

static int asn1_bio_get_ex(BIO *b, int cmd,
    asn1_ps_func **ex_func,
    asn1_ps_func **ex_free_func)
{
    BIO_ASN1_EX_FUNCS extmp;
    int ret;
    ret = BIO_ctrl(b, cmd, 0, &extmp);
    if (ret > 0) {
        *ex_func = extmp.ex_func;
        *ex_free_func = extmp.ex_free_func;
    }
    return ret;
}

int BIO_asn1_set_prefix(BIO *b, asn1_ps_func *prefix,
    asn1_ps_func *prefix_free)
{
    return asn1_bio_set_ex(b, BIO_C_SET_PREFIX, prefix, prefix_free);
}

int BIO_asn1_get_prefix(BIO *b, asn1_ps_func **pprefix,
    asn1_ps_func **pprefix_free)
{
    return asn1_bio_get_ex(b, BIO_C_GET_PREFIX, pprefix, pprefix_free);
}

int BIO_asn1_set_suffix(BIO *b, asn1_ps_func *suffix,
    asn1_ps_func *suffix_free)
{
    return asn1_bio_set_ex(b, BIO_C_SET_SUFFIX, suffix, suffix_free);
}

int BIO_asn1_get_suffix(BIO *b, asn1_ps_func **psuffix,
    asn1_ps_func **psuffix_free)
{
    return asn1_bio_get_ex(b, BIO_C_GET_SUFFIX, psuffix, psuffix_free);
}

Coverage Report

Created: 2025-12-31 06:58

Line	Count	Source
1		/*
2		* Copyright 2006-2021 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		/*
11		* Experimental ASN1 BIO. When written through the data is converted to an
12		* ASN1 string type: default is OCTET STRING. Additional functions can be
13		* provided to add prefix and suffix data.
14		*/
15
16		#include <string.h>
17		#include "internal/bio.h"
18		#include <openssl/asn1.h>
19		#include "internal/cryptlib.h"
20
21		/* Must be large enough for biggest tag+length */
22	0	#define DEFAULT_ASN1_BUF_SIZE 20
23
24		typedef enum {
25		ASN1_STATE_START,
26		ASN1_STATE_PRE_COPY,
27		ASN1_STATE_HEADER,
28		ASN1_STATE_HEADER_COPY,
29		ASN1_STATE_DATA_COPY,
30		ASN1_STATE_POST_COPY,
31		ASN1_STATE_DONE
32		} asn1_bio_state_t;
33
34		typedef struct BIO_ASN1_EX_FUNCS_st {
35		asn1_ps_func *ex_func;
36		asn1_ps_func *ex_free_func;
37		} BIO_ASN1_EX_FUNCS;
38
39		typedef struct BIO_ASN1_BUF_CTX_t {
40		/* Internal state */
41		asn1_bio_state_t state;
42		/* Internal buffer */
43		unsigned char *buf;
44		/* Size of buffer */
45		int bufsize;
46		/* Current position in buffer */
47		int bufpos;
48		/* Current buffer length */
49		int buflen;
50		/* Amount of data to copy */
51		int copylen;
52		/* Class and tag to use */
53		int asn1_class, asn1_tag;
54		asn1_ps_func prefix, prefix_free, suffix, suffix_free;
55		/* Extra buffer for prefix and suffix data */
56		unsigned char *ex_buf;
57		int ex_len;
58		int ex_pos;
59		void *ex_arg;
60		} BIO_ASN1_BUF_CTX;
61
62		static int asn1_bio_write(BIO h, const char buf, int num);
63		static int asn1_bio_read(BIO h, char buf, int size);
64		static int asn1_bio_puts(BIO h, const char str);
65		static int asn1_bio_gets(BIO h, char str, int size);
66		static long asn1_bio_ctrl(BIO h, int cmd, long arg1, void arg2);
67		static int asn1_bio_new(BIO *h);
68		static int asn1_bio_free(BIO *data);
69		static long asn1_bio_callback_ctrl(BIO h, int cmd, BIO_info_cb fp);
70
71		static int asn1_bio_init(BIO_ASN1_BUF_CTX *ctx, int size);
72		static int asn1_bio_flush_ex(BIO b, BIO_ASN1_BUF_CTX ctx,
73		asn1_ps_func *cleanup, asn1_bio_state_t next);
74		static int asn1_bio_setup_ex(BIO b, BIO_ASN1_BUF_CTX ctx,
75		asn1_ps_func *setup,
76		asn1_bio_state_t ex_state,
77		asn1_bio_state_t other_state);
78
79		static const BIO_METHOD methods_asn1 = {
80		BIO_TYPE_ASN1,
81		"asn1",
82		bwrite_conv,
83		asn1_bio_write,
84		bread_conv,
85		asn1_bio_read,
86		asn1_bio_puts,
87		asn1_bio_gets,
88		asn1_bio_ctrl,
89		asn1_bio_new,
90		asn1_bio_free,
91		asn1_bio_callback_ctrl,
92		};
93
94		const BIO_METHOD *BIO_f_asn1(void)
95	0	{
96	0	return &methods_asn1;
97	0	}
98
99		static int asn1_bio_new(BIO *b)
100	0	{
101	0	BIO_ASN1_BUF_CTX ctx = OPENSSL_zalloc(sizeof(ctx));
102
103	0	if (ctx == NULL)
104	0	return 0;
105	0	if (!asn1_bio_init(ctx, DEFAULT_ASN1_BUF_SIZE)) {
106	0	OPENSSL_free(ctx);
107	0	return 0;
108	0	}
109	0	BIO_set_data(b, ctx);
110	0	BIO_set_init(b, 1);
111
112	0	return 1;
113	0	}
114
115		static int asn1_bio_init(BIO_ASN1_BUF_CTX *ctx, int size)
116	0	{
117	0	if (size <= 0) {
118	0	ERR_raise(ERR_LIB_ASN1, ERR_R_PASSED_INVALID_ARGUMENT);
119	0	return 0;
120	0	}
121	0	if ((ctx->buf = OPENSSL_malloc(size)) == NULL)
122	0	return 0;
123	0	ctx->bufsize = size;
124	0	ctx->asn1_class = V_ASN1_UNIVERSAL;
125	0	ctx->asn1_tag = V_ASN1_OCTET_STRING;
126	0	ctx->state = ASN1_STATE_START;
127	0	return 1;
128	0	}
129
130		static int asn1_bio_free(BIO *b)
131	0	{
132	0	BIO_ASN1_BUF_CTX *ctx;
133
134	0	if (b == NULL)
135	0	return 0;
136
137	0	ctx = BIO_get_data(b);
138	0	if (ctx == NULL)
139	0	return 0;
140
141	0	if (ctx->prefix_free != NULL)
142	0	ctx->prefix_free(b, &ctx->ex_buf, &ctx->ex_len, &ctx->ex_arg);
143	0	if (ctx->suffix_free != NULL)
144	0	ctx->suffix_free(b, &ctx->ex_buf, &ctx->ex_len, &ctx->ex_arg);
145
146	0	OPENSSL_free(ctx->buf);
147	0	OPENSSL_free(ctx);
148	0	BIO_set_data(b, NULL);
149	0	BIO_set_init(b, 0);
150
151	0	return 1;
152	0	}
153
154		static int asn1_bio_write(BIO b, const char in, int inl)
155	0	{
156	0	BIO_ASN1_BUF_CTX *ctx;
157	0	int wrmax, wrlen, ret;
158	0	unsigned char *p;
159	0	BIO *next;
160
161	0	ctx = BIO_get_data(b);
162	0	next = BIO_next(b);
163	0	if (in == NULL \|\| inl < 0 \|\| ctx == NULL \|\| next == NULL)
164	0	return 0;
165
166	0	wrlen = 0;
167	0	ret = -1;
168
169	0	for (;;) {
170	0	switch (ctx->state) {
171		/* Setup prefix data, call it */
172	0	case ASN1_STATE_START:
173	0	if (!asn1_bio_setup_ex(b, ctx, ctx->prefix,
174	0	ASN1_STATE_PRE_COPY, ASN1_STATE_HEADER))
175	0	return -1;
176	0	break;
177
178		/* Copy any pre data first */
179	0	case ASN1_STATE_PRE_COPY:
180
181	0	ret = asn1_bio_flush_ex(b, ctx, ctx->prefix_free,
182	0	ASN1_STATE_HEADER);
183
184	0	if (ret <= 0)
185	0	goto done;
186
187	0	break;
188
189	0	case ASN1_STATE_HEADER:
190	0	ctx->buflen = ASN1_object_size(0, inl, ctx->asn1_tag) - inl;
191	0	if (!ossl_assert(ctx->buflen <= ctx->bufsize))
192	0	return -1;
193	0	p = ctx->buf;
194	0	ASN1_put_object(&p, 0, inl, ctx->asn1_tag, ctx->asn1_class);
195	0	ctx->copylen = inl;
196	0	ctx->state = ASN1_STATE_HEADER_COPY;
197
198	0	break;
199
200	0	case ASN1_STATE_HEADER_COPY:
201	0	ret = BIO_write(next, ctx->buf + ctx->bufpos, ctx->buflen);
202	0	if (ret <= 0)
203	0	goto done;
204
205	0	ctx->buflen -= ret;
206	0	if (ctx->buflen)
207	0	ctx->bufpos += ret;
208	0	else {
209	0	ctx->bufpos = 0;
210	0	ctx->state = ASN1_STATE_DATA_COPY;
211	0	}
212
213	0	break;
214
215	0	case ASN1_STATE_DATA_COPY:
216
217	0	if (inl > ctx->copylen)
218	0	wrmax = ctx->copylen;
219	0	else
220	0	wrmax = inl;
221	0	ret = BIO_write(next, in, wrmax);
222	0	if (ret <= 0)
223	0	goto done;
224	0	wrlen += ret;
225	0	ctx->copylen -= ret;
226	0	in += ret;
227	0	inl -= ret;
228
229	0	if (ctx->copylen == 0)
230	0	ctx->state = ASN1_STATE_HEADER;
231
232	0	if (inl == 0)
233	0	goto done;
234
235	0	break;
236
237	0	case ASN1_STATE_POST_COPY:
238	0	case ASN1_STATE_DONE:
239	0	BIO_clear_retry_flags(b);
240	0	return 0;
241	0	}
242	0	}
243
244	0	done:
245	0	BIO_clear_retry_flags(b);
246	0	BIO_copy_next_retry(b);
247
248	0	return (wrlen > 0) ? wrlen : ret;
249	0	}
250
251		static int asn1_bio_flush_ex(BIO b, BIO_ASN1_BUF_CTX ctx,
252		asn1_ps_func *cleanup, asn1_bio_state_t next)
253	0	{
254	0	int ret;
255
256	0	if (ctx->ex_len <= 0)
257	0	return 1;
258	0	for (;;) {
259	0	ret = BIO_write(BIO_next(b), ctx->ex_buf + ctx->ex_pos, ctx->ex_len);
260	0	if (ret <= 0)
261	0	break;
262	0	ctx->ex_len -= ret;
263	0	if (ctx->ex_len > 0)
264	0	ctx->ex_pos += ret;
265	0	else {
266	0	if (cleanup)
267	0	cleanup(b, &ctx->ex_buf, &ctx->ex_len, &ctx->ex_arg);
268	0	ctx->state = next;
269	0	ctx->ex_pos = 0;
270	0	break;
271	0	}
272	0	}
273	0	return ret;
274	0	}
275
276		static int asn1_bio_setup_ex(BIO b, BIO_ASN1_BUF_CTX ctx,
277		asn1_ps_func *setup,
278		asn1_bio_state_t ex_state,
279		asn1_bio_state_t other_state)
280	0	{
281	0	if (setup && !setup(b, &ctx->ex_buf, &ctx->ex_len, &ctx->ex_arg)) {
282	0	BIO_clear_retry_flags(b);
283	0	return 0;
284	0	}
285	0	if (ctx->ex_len > 0)
286	0	ctx->state = ex_state;
287	0	else
288	0	ctx->state = other_state;
289	0	return 1;
290	0	}
291
292		static int asn1_bio_read(BIO b, char in, int inl)
293	0	{
294	0	BIO *next = BIO_next(b);
295	0	if (next == NULL)
296	0	return 0;
297	0	return BIO_read(next, in, inl);
298	0	}
299
300		static int asn1_bio_puts(BIO b, const char str)
301	0	{
302	0	return asn1_bio_write(b, str, strlen(str));
303	0	}
304
305		static int asn1_bio_gets(BIO b, char str, int size)
306	0	{
307	0	BIO *next = BIO_next(b);
308	0	if (next == NULL)
309	0	return 0;
310	0	return BIO_gets(next, str, size);
311	0	}
312
313		static long asn1_bio_callback_ctrl(BIO b, int cmd, BIO_info_cb fp)
314	0	{
315	0	BIO *next = BIO_next(b);
316	0	if (next == NULL)
317	0	return 0;
318	0	return BIO_callback_ctrl(next, cmd, fp);
319	0	}
320
321		static long asn1_bio_ctrl(BIO b, int cmd, long arg1, void arg2)
322	0	{
323	0	BIO_ASN1_BUF_CTX *ctx;
324	0	BIO_ASN1_EX_FUNCS *ex_func;
325	0	long ret = 1;
326	0	BIO *next;
327
328	0	ctx = BIO_get_data(b);
329	0	if (ctx == NULL)
330	0	return 0;
331	0	next = BIO_next(b);
332	0	switch (cmd) {
333
334	0	case BIO_C_SET_PREFIX:
335	0	ex_func = arg2;
336	0	ctx->prefix = ex_func->ex_func;
337	0	ctx->prefix_free = ex_func->ex_free_func;
338	0	break;
339
340	0	case BIO_C_GET_PREFIX:
341	0	ex_func = arg2;
342	0	ex_func->ex_func = ctx->prefix;
343	0	ex_func->ex_free_func = ctx->prefix_free;
344	0	break;
345
346	0	case BIO_C_SET_SUFFIX:
347	0	ex_func = arg2;
348	0	ctx->suffix = ex_func->ex_func;
349	0	ctx->suffix_free = ex_func->ex_free_func;
350	0	break;
351
352	0	case BIO_C_GET_SUFFIX:
353	0	ex_func = arg2;
354	0	ex_func->ex_func = ctx->suffix;
355	0	ex_func->ex_free_func = ctx->suffix_free;
356	0	break;
357
358	0	case BIO_C_SET_EX_ARG:
359	0	ctx->ex_arg = arg2;
360	0	break;
361
362	0	case BIO_C_GET_EX_ARG:
363	0	(void *)arg2 = ctx->ex_arg;
364	0	break;
365
366	0	case BIO_CTRL_FLUSH:
367	0	if (next == NULL)
368	0	return 0;
369
370		/* Call post function if possible */
371	0	if (ctx->state == ASN1_STATE_HEADER) {
372	0	if (!asn1_bio_setup_ex(b, ctx, ctx->suffix,
373	0	ASN1_STATE_POST_COPY, ASN1_STATE_DONE))
374	0	return 0;
375	0	}
376
377	0	if (ctx->state == ASN1_STATE_POST_COPY) {
378	0	ret = asn1_bio_flush_ex(b, ctx, ctx->suffix_free,
379	0	ASN1_STATE_DONE);
380	0	if (ret <= 0)
381	0	return ret;
382	0	}
383
384	0	if (ctx->state == ASN1_STATE_DONE)
385	0	return BIO_ctrl(next, cmd, arg1, arg2);
386	0	else {
387	0	BIO_clear_retry_flags(b);
388	0	return 0;
389	0	}
390
391	0	default:
392	0	if (next == NULL)
393	0	return 0;
394	0	return BIO_ctrl(next, cmd, arg1, arg2);
395	0	}
396
397	0	return ret;
398	0	}
399
400		static int asn1_bio_set_ex(BIO *b, int cmd,
401		asn1_ps_func ex_func, asn1_ps_func ex_free_func)
402	0	{
403	0	BIO_ASN1_EX_FUNCS extmp;
404	0	extmp.ex_func = ex_func;
405	0	extmp.ex_free_func = ex_free_func;
406	0	return BIO_ctrl(b, cmd, 0, &extmp);
407	0	}
408
409		static int asn1_bio_get_ex(BIO *b, int cmd,
410		asn1_ps_func **ex_func,
411		asn1_ps_func **ex_free_func)
412	0	{
413	0	BIO_ASN1_EX_FUNCS extmp;
414	0	int ret;
415	0	ret = BIO_ctrl(b, cmd, 0, &extmp);
416	0	if (ret > 0) {
417	0	*ex_func = extmp.ex_func;
418	0	*ex_free_func = extmp.ex_free_func;
419	0	}
420	0	return ret;
421	0	}
422
423		int BIO_asn1_set_prefix(BIO b, asn1_ps_func prefix,
424		asn1_ps_func *prefix_free)
425	0	{
426	0	return asn1_bio_set_ex(b, BIO_C_SET_PREFIX, prefix, prefix_free);
427	0	}
428
429		int BIO_asn1_get_prefix(BIO b, asn1_ps_func *pprefix,
430		asn1_ps_func **pprefix_free)
431	0	{
432	0	return asn1_bio_get_ex(b, BIO_C_GET_PREFIX, pprefix, pprefix_free);
433	0	}
434
435		int BIO_asn1_set_suffix(BIO b, asn1_ps_func suffix,
436		asn1_ps_func *suffix_free)
437	0	{
438	0	return asn1_bio_set_ex(b, BIO_C_SET_SUFFIX, suffix, suffix_free);
439	0	}
440
441		int BIO_asn1_get_suffix(BIO b, asn1_ps_func *psuffix,
442		asn1_ps_func **psuffix_free)
443	0	{
444	0	return asn1_bio_get_ex(b, BIO_C_GET_SUFFIX, psuffix, psuffix_free);
445	0	}