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37 results

base16-decode.c

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  • Forked from Nettle / nettle
    Source project has a limited visibility.
    base16dec.c 2.84 KiB
    /* base16dec -- an decoder for base16
     *
     * 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., 51 Franklin Street, Fifth Floor, Boston,
     * MA 02111-1301, USA.
     */
    
    #if HAVE_CONFIG_H
    # include "config.h"
    #endif
    
    #include <errno.h>
    #include <stdlib.h>
    #include <stdio.h>
    #include <string.h>
    #ifdef WIN32
    #include <fcntl.h>
    #endif
    
    #include "base16.h"
    
    #include "io.h"
    
    #define CHUNK_SIZE 16392
    
    /* The maximum number of bytes generated for each chunk: */
    #define DECODED_SIZE BASE16_DECODE_LENGTH(CHUNK_SIZE)
    
    
    /*
     * Reads base-16 encoded from stdin, writes decoded to stdout.
     */
    int
    main(int argc UNUSED, char **argv UNUSED)
    {
      /* "buffer" will hold the bytes from disk: */
      uint8_t * buffer = xalloc (CHUNK_SIZE);
    
      /* "result" will hold bytes before output: */
      uint8_t * result = xalloc (DECODED_SIZE);
    
      /* We need a Base16 context for decoding: */
      struct base16_decode_ctx b16_ctx;
    
      /* Init the context: */
      base16_decode_init (&b16_ctx);
    
    #ifdef WIN32
      _setmode(1, O_BINARY);
    #endif
    
      for (;;)
        {
          int nbytes; /* Number of bytes read frmo disk at each iteration */
          size_t decoded_bytes; /* Bytes actually generated at each iteration */
    
          nbytes = fread(buffer, 1, CHUNK_SIZE, stdin);
    
          if (nbytes < CHUNK_SIZE && ferror(stdin))
    	{
    	  werror ("Error reading file: %s\n", strerror(errno));
    	  return EXIT_FAILURE;
    	}
          
          decoded_bytes = BASE16_DECODE_LENGTH(nbytes);
    
          /* Decodes one chunk: */
          if (!base16_decode_update(&b16_ctx, &decoded_bytes, result, nbytes, buffer))
    	{
    	  werror ("Error decoding input (not base16?)\n");
    	  return EXIT_FAILURE;
    	}
    
          if (!write_string (stdout, decoded_bytes, result))
    	{
    	  werror ("Error writing file: %s\n", strerror(errno));
    	  return EXIT_FAILURE;
    	}
          if (nbytes < CHUNK_SIZE)
    	{
    	  /* Check if decoding finalized OK: */
    	  if (!base16_decode_final(&b16_ctx))
    	    {
    	      werror("Decoding did not finish properly.\n");
    	      return EXIT_FAILURE;
    	    }
    	  break;
    	}
        }
    
      if (fflush (stdout) != 0)
        {
          werror ("Error writing file: %s\n", strerror(errno));
          return EXIT_FAILURE;
        }
    
      free (buffer);
      free (result);
    
      return EXIT_SUCCESS;
    }