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/* base64dec -- an decoder 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 "base64.h"
#include "io.h"
#define CHUNK_SIZE 16392
/* The maximum number of bytes generated for each chunk: */
#define DECODED_SIZE BASE64_DECODE_LENGTH(CHUNK_SIZE)
/*
* Reads base-64 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 Base64 context for decoding: */
struct base64_decode_ctx b64_ctx;
/* Init the context: */
base64_decode_init(&b64_ctx);
#ifdef WIN32
_setmode(1, O_BINARY);
#endif
for (;;)
{
int nbytes; /* Number of bytes read frmo disk at each iteration */
unsigned 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 = BASE64_DECODE_LENGTH(nbytes);
/* Decodes one chunk: */
if (!base64_decode_update(&b64_ctx, &decoded_bytes, result, nbytes, buffer))
{
werror ("Error decoding input (not base64?)\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 (!base64_decode_final(&b64_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;
}
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