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125 lines
3.0 KiB
C
125 lines
3.0 KiB
C
/* base16dec -- an decoder for base16
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Copyright (C) 2006, 2012 Jeronimo Pellegrini, Niels Möller
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This file is part of GNU Nettle.
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GNU Nettle is free software: you can redistribute it and/or
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modify it under the terms of either:
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* the GNU Lesser General Public License as published by the Free
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Software Foundation; either version 3 of the License, or (at your
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option) any later version.
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or
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* the GNU General Public License as published by the Free
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Software Foundation; either version 2 of the License, or (at your
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option) any later version.
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or both in parallel, as here.
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GNU Nettle is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received copies of the GNU General Public License and
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the GNU Lesser General Public License along with this program. If
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not, see http://www.gnu.org/licenses/.
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*/
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#if HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <errno.h>
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#include <stdlib.h>
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#include <stdio.h>
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#include <string.h>
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#ifdef WIN32
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#include <fcntl.h>
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#endif
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#include "base16.h"
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#include "io.h"
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#define CHUNK_SIZE 16392
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/* The maximum number of bytes generated for each chunk: */
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#define DECODED_SIZE BASE16_DECODE_LENGTH(CHUNK_SIZE)
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/*
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* Reads base-16 encoded from stdin, writes decoded to stdout.
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*/
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int
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main(int argc UNUSED, char **argv UNUSED)
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{
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/* "buffer" will hold the bytes from disk: */
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char * buffer = xalloc (CHUNK_SIZE);
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/* "result" will hold bytes before output: */
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uint8_t * result = xalloc (DECODED_SIZE);
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/* We need a Base16 context for decoding: */
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struct base16_decode_ctx b16_ctx;
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/* Init the context: */
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base16_decode_init (&b16_ctx);
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#ifdef WIN32
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_setmode(1, O_BINARY);
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#endif
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for (;;)
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{
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int nbytes; /* Number of bytes read frmo disk at each iteration */
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size_t decoded_bytes; /* Bytes actually generated at each iteration */
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nbytes = fread(buffer, 1, CHUNK_SIZE, stdin);
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if (nbytes < CHUNK_SIZE && ferror(stdin))
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{
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werror ("Error reading file: %s\n", strerror(errno));
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return EXIT_FAILURE;
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}
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/* Decodes one chunk: */
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if (!base16_decode_update(&b16_ctx, &decoded_bytes, result, nbytes, buffer))
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{
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werror ("Error decoding input (not base16?)\n");
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return EXIT_FAILURE;
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}
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if (!write_data (stdout, decoded_bytes, result))
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{
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werror ("Error writing file: %s\n", strerror(errno));
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return EXIT_FAILURE;
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}
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if (nbytes < CHUNK_SIZE)
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{
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/* Check if decoding finalized OK: */
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if (!base16_decode_final(&b16_ctx))
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{
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werror("Decoding did not finish properly.\n");
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return EXIT_FAILURE;
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}
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break;
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}
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}
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if (fflush (stdout) != 0)
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{
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werror ("Error writing file: %s\n", strerror(errno));
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return EXIT_FAILURE;
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}
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free (buffer);
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free (result);
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return EXIT_SUCCESS;
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}
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