ref: bfe9da47cfa2f51ebef78c59332b5ba2deba306d
dir: /third_party/boringssl/src/crypto/bio/file.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.] */
#if defined(__linux) || defined(__sun) || defined(__hpux)
// Following definition aliases fopen to fopen64 on above mentioned
// platforms. This makes it possible to open and sequentially access
// files larger than 2GB from 32-bit application. It does not allow to
// traverse them beyond 2GB with fseek/ftell, but on the other hand *no*
// 32-bit platform permits that, not with fseek/ftell. Not to mention
// that breaking 2GB limit for seeking would require surgery to *our*
// API. But sequential access suffices for practical cases when you
// can run into large files, such as fingerprinting, so we can let API
// alone. For reference, the list of 32-bit platforms which allow for
// sequential access of large files without extra "magic" comprise *BSD,
// Darwin, IRIX...
#ifndef _FILE_OFFSET_BITS
#define _FILE_OFFSET_BITS 64
#endif
#endif
#include <openssl/bio.h>
#if !defined(OPENSSL_TRUSTY)
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <openssl/err.h>
#include <openssl/mem.h>
#include "../internal.h"
#define BIO_FP_READ 0x02
#define BIO_FP_WRITE 0x04
#define BIO_FP_APPEND 0x08
BIO *BIO_new_file(const char *filename, const char *mode) {
BIO *ret;
FILE *file;
file = fopen(filename, mode);
if (file == NULL) {
OPENSSL_PUT_SYSTEM_ERROR();
ERR_add_error_data(5, "fopen('", filename, "','", mode, "')");
if (errno == ENOENT) {
OPENSSL_PUT_ERROR(BIO, BIO_R_NO_SUCH_FILE);
} else {
OPENSSL_PUT_ERROR(BIO, BIO_R_SYS_LIB);
}
return NULL;
}
ret = BIO_new_fp(file, BIO_CLOSE);
if (ret == NULL) {
fclose(file);
return NULL;
}
return ret;
}
BIO *BIO_new_fp(FILE *stream, int close_flag) {
BIO *ret = BIO_new(BIO_s_file());
if (ret == NULL) {
return NULL;
}
BIO_set_fp(ret, stream, close_flag);
return ret;
}
static int file_free(BIO *bio) {
if (!bio->shutdown) {
return 1;
}
if (bio->init && bio->ptr != NULL) {
fclose(bio->ptr);
bio->ptr = NULL;
}
bio->init = 0;
return 1;
}
static int file_read(BIO *b, char *out, int outl) {
if (!b->init) {
return 0;
}
size_t ret = fread(out, 1, outl, (FILE *)b->ptr);
if (ret == 0 && ferror((FILE *)b->ptr)) {
OPENSSL_PUT_SYSTEM_ERROR();
OPENSSL_PUT_ERROR(BIO, ERR_R_SYS_LIB);
return -1;
}
// fread reads at most |outl| bytes, so |ret| fits in an int.
return (int)ret;
}
static int file_write(BIO *b, const char *in, int inl) {
int ret = 0;
if (!b->init) {
return 0;
}
ret = fwrite(in, inl, 1, (FILE *)b->ptr);
if (ret > 0) {
ret = inl;
}
return ret;
}
static long file_ctrl(BIO *b, int cmd, long num, void *ptr) {
long ret = 1;
FILE *fp = (FILE *)b->ptr;
FILE **fpp;
char p[4];
switch (cmd) {
case BIO_CTRL_RESET:
num = 0;
OPENSSL_FALLTHROUGH;
case BIO_C_FILE_SEEK:
ret = (long)fseek(fp, num, 0);
break;
case BIO_CTRL_EOF:
ret = (long)feof(fp);
break;
case BIO_C_FILE_TELL:
case BIO_CTRL_INFO:
ret = ftell(fp);
break;
case BIO_C_SET_FILE_PTR:
file_free(b);
b->shutdown = (int)num & BIO_CLOSE;
b->ptr = ptr;
b->init = 1;
break;
case BIO_C_SET_FILENAME:
file_free(b);
b->shutdown = (int)num & BIO_CLOSE;
if (num & BIO_FP_APPEND) {
if (num & BIO_FP_READ) {
OPENSSL_strlcpy(p, "a+", sizeof(p));
} else {
OPENSSL_strlcpy(p, "a", sizeof(p));
}
} else if ((num & BIO_FP_READ) && (num & BIO_FP_WRITE)) {
OPENSSL_strlcpy(p, "r+", sizeof(p));
} else if (num & BIO_FP_WRITE) {
OPENSSL_strlcpy(p, "w", sizeof(p));
} else if (num & BIO_FP_READ) {
OPENSSL_strlcpy(p, "r", sizeof(p));
} else {
OPENSSL_PUT_ERROR(BIO, BIO_R_BAD_FOPEN_MODE);
ret = 0;
break;
}
fp = fopen(ptr, p);
if (fp == NULL) {
OPENSSL_PUT_SYSTEM_ERROR();
ERR_add_error_data(5, "fopen('", ptr, "','", p, "')");
OPENSSL_PUT_ERROR(BIO, ERR_R_SYS_LIB);
ret = 0;
break;
}
b->ptr = fp;
b->init = 1;
break;
case BIO_C_GET_FILE_PTR:
// the ptr parameter is actually a FILE ** in this case.
if (ptr != NULL) {
fpp = (FILE **)ptr;
*fpp = (FILE *)b->ptr;
}
break;
case BIO_CTRL_GET_CLOSE:
ret = (long)b->shutdown;
break;
case BIO_CTRL_SET_CLOSE:
b->shutdown = (int)num;
break;
case BIO_CTRL_FLUSH:
ret = 0 == fflush((FILE *)b->ptr);
break;
case BIO_CTRL_WPENDING:
case BIO_CTRL_PENDING:
default:
ret = 0;
break;
}
return ret;
}
static int file_gets(BIO *bp, char *buf, int size) {
int ret = 0;
if (size == 0) {
return 0;
}
if (!fgets(buf, size, (FILE *)bp->ptr)) {
buf[0] = 0;
goto err;
}
ret = strlen(buf);
err:
return ret;
}
static const BIO_METHOD methods_filep = {
BIO_TYPE_FILE, "FILE pointer",
file_write, file_read,
NULL /* puts */, file_gets,
file_ctrl, NULL /* create */,
file_free, NULL /* callback_ctrl */,
};
const BIO_METHOD *BIO_s_file(void) { return &methods_filep; }
int BIO_get_fp(BIO *bio, FILE **out_file) {
return BIO_ctrl(bio, BIO_C_GET_FILE_PTR, 0, (char*) out_file);
}
int BIO_set_fp(BIO *bio, FILE *file, int close_flag) {
return BIO_ctrl(bio, BIO_C_SET_FILE_PTR, close_flag, (char *) file);
}
int BIO_read_filename(BIO *bio, const char *filename) {
return BIO_ctrl(bio, BIO_C_SET_FILENAME, BIO_CLOSE | BIO_FP_READ,
(char *)filename);
}
int BIO_write_filename(BIO *bio, const char *filename) {
return BIO_ctrl(bio, BIO_C_SET_FILENAME, BIO_CLOSE | BIO_FP_WRITE,
(char *)filename);
}
int BIO_append_filename(BIO *bio, const char *filename) {
return BIO_ctrl(bio, BIO_C_SET_FILENAME, BIO_CLOSE | BIO_FP_APPEND,
(char *)filename);
}
int BIO_rw_filename(BIO *bio, const char *filename) {
return BIO_ctrl(bio, BIO_C_SET_FILENAME,
BIO_CLOSE | BIO_FP_READ | BIO_FP_WRITE, (char *)filename);
}
#endif // OPENSSL_TRUSTY