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41 results

base64enc.c

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  • Forked from Nettle / nettle
    Source project has a limited visibility.
    base64enc.c 2.71 KiB
    /* base64enc -- an encoder for base64
     *
     * Copyright (C) 2006, 2012 Jeronimo Pellegrini, Niels Möller
     *
     * This program 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.
     *
     * This program 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 <errno.h>
    #include <stdlib.h>
    #include <stdio.h>
    #include <string.h>
    
    #include <nettle/base64.h>
    
    #include "io.h"
    
    /* The number of bytes read in each iteration, we do one line at a time: */
    #define CHUNK_SIZE 54
    
    /* The *maximum* size of an encoded chunk: */
    #define ENCODED_SIZE BASE64_ENCODE_LENGTH(CHUNK_SIZE)
    
    /*
     * Reads bytes from standard input and writes base64-encoded
     * on standard output.
     */
    int
    main(int argc UNUSED, char **argv UNUSED)
    {
      struct base64_encode_ctx b64_ctx;
    
      /* Init the context: */
      base64_encode_init(&b64_ctx);
    
    #ifdef WIN32
      _setmode(0, O_BINARY);
    #endif
    
      for (;;)
        {
          /* "buffer" will hold the bytes from disk: */
          uint8_t buffer[CHUNK_SIZE];
          /* "result" is the result vector: */
          uint8_t result[ENCODED_SIZE + BASE64_ENCODE_FINAL_LENGTH + 1];
          unsigned nbytes; /* Number of bytes read from stdin */
          int encoded_bytes; /* total number of bytes encoded per iteration */
          nbytes = fread(buffer,1,CHUNK_SIZE,stdin);
    
          /* We overwrite result with more data */
          encoded_bytes = base64_encode_update(&b64_ctx, result, nbytes, buffer);
    
          if (nbytes < CHUNK_SIZE)
    	{
    	  if (ferror(stdin))
    	    {
    	      werror ("Error reading file: %s\n", strerror(errno));
    	      return EXIT_FAILURE;
    	    }
    	  encoded_bytes += base64_encode_final(&b64_ctx,result + encoded_bytes);
    
    	  result[encoded_bytes++] = '\n';
    	  if (!write_string (stdout, encoded_bytes, result)
    	      || fflush (stdout) != 0)
    	    {
    	      werror ("Error writing file: %s\n", strerror(errno));
    	      return EXIT_FAILURE;
    	    }
    	  return EXIT_SUCCESS;
    	}
    
          /* The result vector is written */
          result[encoded_bytes++] = '\n';
          if (!write_string (stdout, encoded_bytes, result))
    	{
    	  werror ("Error writing file: %s\n", strerror(errno));
    	  return EXIT_FAILURE;
    	}
        }
    }