ref: 8bc69a872883224675a55db51ac8f60ab5ed9e5a
dir: /third_party/boringssl/src/crypto/bio/bio_mem.c/
/* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
* All rights reserved.
*
* This package is an SSL implementation written
* by Eric Young (eay@cryptsoft.com).
* The implementation was written so as to conform with Netscapes SSL.
*
* This library is free for commercial and non-commercial use as long as
* the following conditions are aheared to. The following conditions
* apply to all code found in this distribution, be it the RC4, RSA,
* lhash, DES, etc., code; not just the SSL code. The SSL documentation
* included with this distribution is covered by the same copyright terms
* except that the holder is Tim Hudson (tjh@cryptsoft.com).
*
* Copyright remains Eric Young's, and as such any Copyright notices in
* the code are not to be removed.
* If this package is used in a product, Eric Young should be given attribution
* as the author of the parts of the library used.
* This can be in the form of a textual message at program startup or
* in documentation (online or textual) provided with the package.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* "This product includes cryptographic software written by
* Eric Young (eay@cryptsoft.com)"
* The word 'cryptographic' can be left out if the rouines from the library
* being used are not cryptographic related :-).
* 4. If you include any Windows specific code (or a derivative thereof) from
* the apps directory (application code) you must include an acknowledgement:
* "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
*
* THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* The licence and distribution terms for any publically available version or
* derivative of this code cannot be changed. i.e. this code cannot simply be
* copied and put under another distribution licence
* [including the GNU Public Licence.] */
#include <openssl/bio.h>
#include <limits.h>
#include <string.h>
#include <openssl/buf.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include "../internal.h"
BIO *BIO_new_mem_buf(const void *buf, int len) {
BIO *ret;
BUF_MEM *b;
const size_t size = len < 0 ? strlen((char *)buf) : (size_t)len;
if (!buf && len != 0) {
OPENSSL_PUT_ERROR(BIO, BIO_R_NULL_PARAMETER);
return NULL;
}
ret = BIO_new(BIO_s_mem());
if (ret == NULL) {
return NULL;
}
b = (BUF_MEM *)ret->ptr;
// BIO_FLAGS_MEM_RDONLY ensures |b->data| is not written to.
b->data = (void *)buf;
b->length = size;
b->max = size;
ret->flags |= BIO_FLAGS_MEM_RDONLY;
// |num| is used to store the value that this BIO will return when it runs
// out of data. If it's negative then the retry flags will also be set. Since
// this is static data, retrying wont help
ret->num = 0;
return ret;
}
static int mem_new(BIO *bio) {
BUF_MEM *b;
b = BUF_MEM_new();
if (b == NULL) {
return 0;
}
// |shutdown| is used to store the close flag: whether the BIO has ownership
// of the BUF_MEM.
bio->shutdown = 1;
bio->init = 1;
bio->num = -1;
bio->ptr = (char *)b;
return 1;
}
static int mem_free(BIO *bio) {
if (!bio->shutdown || !bio->init || bio->ptr == NULL) {
return 1;
}
BUF_MEM *b = (BUF_MEM *)bio->ptr;
if (bio->flags & BIO_FLAGS_MEM_RDONLY) {
b->data = NULL;
}
BUF_MEM_free(b);
bio->ptr = NULL;
return 1;
}
static int mem_read(BIO *bio, char *out, int outl) {
int ret;
BUF_MEM *b = (BUF_MEM*) bio->ptr;
BIO_clear_retry_flags(bio);
ret = outl;
if (b->length < INT_MAX && ret > (int)b->length) {
ret = b->length;
}
if (ret > 0) {
OPENSSL_memcpy(out, b->data, ret);
b->length -= ret;
if (bio->flags & BIO_FLAGS_MEM_RDONLY) {
b->data += ret;
} else {
OPENSSL_memmove(b->data, &b->data[ret], b->length);
}
} else if (b->length == 0) {
ret = bio->num;
if (ret != 0) {
BIO_set_retry_read(bio);
}
}
return ret;
}
static int mem_write(BIO *bio, const char *in, int inl) {
int ret = -1;
int blen;
BUF_MEM *b;
b = (BUF_MEM *)bio->ptr;
if (bio->flags & BIO_FLAGS_MEM_RDONLY) {
OPENSSL_PUT_ERROR(BIO, BIO_R_WRITE_TO_READ_ONLY_BIO);
goto err;
}
BIO_clear_retry_flags(bio);
blen = b->length;
if (INT_MAX - blen < inl) {
goto err;
}
if (BUF_MEM_grow_clean(b, blen + inl) != ((size_t) blen) + inl) {
goto err;
}
OPENSSL_memcpy(&b->data[blen], in, inl);
ret = inl;
err:
return ret;
}
static int mem_gets(BIO *bio, char *buf, int size) {
int i, j;
char *p;
BUF_MEM *b = (BUF_MEM *)bio->ptr;
BIO_clear_retry_flags(bio);
j = b->length;
if (size - 1 < j) {
j = size - 1;
}
if (j <= 0) {
if (size > 0) {
*buf = 0;
}
return 0;
}
p = b->data;
for (i = 0; i < j; i++) {
if (p[i] == '\n') {
i++;
break;
}
}
// i is now the max num of bytes to copy, either j or up to and including the
// first newline
i = mem_read(bio, buf, i);
if (i > 0) {
buf[i] = '\0';
}
return i;
}
static long mem_ctrl(BIO *bio, int cmd, long num, void *ptr) {
long ret = 1;
char **pptr;
BUF_MEM *b = (BUF_MEM *)bio->ptr;
switch (cmd) {
case BIO_CTRL_RESET:
if (b->data != NULL) {
// For read only case reset to the start again
if (bio->flags & BIO_FLAGS_MEM_RDONLY) {
b->data -= b->max - b->length;
b->length = b->max;
} else {
OPENSSL_memset(b->data, 0, b->max);
b->length = 0;
}
}
break;
case BIO_CTRL_EOF:
ret = (long)(b->length == 0);
break;
case BIO_C_SET_BUF_MEM_EOF_RETURN:
bio->num = (int)num;
break;
case BIO_CTRL_INFO:
ret = (long)b->length;
if (ptr != NULL) {
pptr = (char **)ptr;
*pptr = (char *)&b->data[0];
}
break;
case BIO_C_SET_BUF_MEM:
mem_free(bio);
bio->shutdown = (int)num;
bio->ptr = ptr;
break;
case BIO_C_GET_BUF_MEM_PTR:
if (ptr != NULL) {
pptr = (char **)ptr;
*pptr = (char *)b;
}
break;
case BIO_CTRL_GET_CLOSE:
ret = (long)bio->shutdown;
break;
case BIO_CTRL_SET_CLOSE:
bio->shutdown = (int)num;
break;
case BIO_CTRL_WPENDING:
ret = 0L;
break;
case BIO_CTRL_PENDING:
ret = (long)b->length;
break;
case BIO_CTRL_FLUSH:
ret = 1;
break;
default:
ret = 0;
break;
}
return ret;
}
static const BIO_METHOD mem_method = {
BIO_TYPE_MEM, "memory buffer",
mem_write, mem_read,
NULL /* puts */, mem_gets,
mem_ctrl, mem_new,
mem_free, NULL /* callback_ctrl */,
};
const BIO_METHOD *BIO_s_mem(void) { return &mem_method; }
int BIO_mem_contents(const BIO *bio, const uint8_t **out_contents,
size_t *out_len) {
const BUF_MEM *b;
if (bio->method != &mem_method) {
return 0;
}
b = (BUF_MEM *)bio->ptr;
*out_contents = (uint8_t *)b->data;
*out_len = b->length;
return 1;
}
long BIO_get_mem_data(BIO *bio, char **contents) {
return BIO_ctrl(bio, BIO_CTRL_INFO, 0, (char *) contents);
}
int BIO_get_mem_ptr(BIO *bio, BUF_MEM **out) {
return BIO_ctrl(bio, BIO_C_GET_BUF_MEM_PTR, 0, (char *) out);
}
int BIO_set_mem_buf(BIO *bio, BUF_MEM *b, int take_ownership) {
return BIO_ctrl(bio, BIO_C_SET_BUF_MEM, take_ownership, (char *) b);
}
int BIO_set_mem_eof_return(BIO *bio, int eof_value) {
return BIO_ctrl(bio, BIO_C_SET_BUF_MEM_EOF_RETURN, eof_value, NULL);
}