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41 results

io.c

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  • io.c 3.62 KiB
    /* 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., 51 Franklin Street, Fifth Floor, Boston,
     * MA 02111-1301, 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;
        }
    }