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/* io.c
*
* Miscellaneous functions used by the example programs.
*/
/* nettle, low-level cryptographics library
*
* Copyright (C) 2002 Niels Möller
*
* The nettle library is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at your
* option) any later version.
*
* The nettle library is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
* License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with the nettle library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
* MA 02111-1307, USA.
*/
#if HAVE_CONFIG_H
# include "config.h"
#endif
#include <stdarg.h>
#include <stdlib.h>
/* For errno and strerror */
#include <errno.h>
#include <string.h>
#include "io.h"
#define RANDOM_DEVICE "/dev/urandom"
#define BUFSIZE 1000
int quiet_flag = 0;
void *
xalloc(size_t size)
{
void *p = malloc(size);
if (!p)
{
fprintf(stderr, "Virtual memory exhausted.\n");
abort();
}
return p;
}
void
werror(const char *format, ...)
{
if (!quiet_flag)
{
va_list args;
va_start(args, format);
vfprintf(stderr, format, args);
va_end(args);
}
}
#define MIN(a,b) (((a) < (b)) ? (a) : (b))
unsigned
read_file(const char *name, unsigned max_size, char **contents)
{
unsigned size;
unsigned done;
char *buffer;
FILE *f;
f = fopen(name, "rb");
if (!f)
{
werror("Opening `%s' failed: %s\n", name, strerror(errno));
return 0;
}
buffer = NULL;
if (max_size && max_size < 100)
size = max_size;
else
size = 100;
/* FIXME: The use of feof and ferror in this loop is a bit confused
(but I think it is still correct). We should check the return
value of fread, and call feof and/or ferror when we get a short
item count. */
for (done = 0;
(!max_size || done < max_size) && !feof(f);
size *= 2)
{
char *p;
if (max_size && size > max_size)
size = max_size;
/* Space for terminating NUL */
p = realloc(buffer, size + 1);
if (!p)
{
fail:
fclose(f);
free(buffer);
*contents = NULL;
return 0;
}
buffer = p;
done += fread(buffer + done, 1, size - done, f);
if (ferror(f))
goto fail;
}
fclose(f);
/* NUL-terminate the data. */
buffer[done] = '\0';
*contents = buffer;
return done;
}
int
write_string(FILE *f, unsigned size, const char *buffer)
{
size_t res = fwrite(buffer, 1, size, f);
return res == size;
}
int
write_file(const char *name, unsigned size, const char *buffer)
{
FILE *f = fopen(name, "wb");
int res;
if (!f)
return 0;
res = write_string(f, size, buffer);
return fclose(f) == 0 && res;
}
int
simple_random(struct yarrow256_ctx *ctx, const char *name)
{
unsigned length;
char *buffer;
if (name)
length = read_file(name, 0, &buffer);
else
length = read_file(RANDOM_DEVICE, 20, &buffer);
if (!length)
return 0;
yarrow256_seed(ctx, length, buffer);
free(buffer);
return 1;
}
int
hash_file(const struct nettle_hash *hash, void *ctx, FILE *f)
{
for (;;)
{
char buffer[BUFSIZE];
size_t res = fread(buffer, 1, sizeof(buffer), f);
if (ferror(f))
return 0;
hash->update(ctx, res, buffer);
if (feof(f))
return 1;
}
}
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