1 /* base64enc -- an encoder for base64
3 * Copyright (C) 2006, 2012 Jeronimo Pellegrini, Niels Möller
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU Lesser General Public License as published by
7 * the Free Software Foundation; either version 2.1 of the License, or (at your
8 * option) any later version.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
12 * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
13 * License for more details.
15 * You should have received a copy of the GNU Lesser General Public License
16 * along with the nettle library; see the file COPYING.LIB. If not, write to
17 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
37 /* The number of bytes read in each iteration, we do one line at a time: */
40 /* The *maximum* size of an encoded chunk: */
41 #define ENCODED_SIZE BASE64_ENCODE_LENGTH(CHUNK_SIZE)
44 * Reads bytes from standard input and writes base64-encoded
48 main(int argc UNUSED, char **argv UNUSED)
50 struct base64_encode_ctx b64_ctx;
52 /* Init the context: */
53 base64_encode_init(&b64_ctx);
56 _setmode(0, O_BINARY);
61 /* "buffer" will hold the bytes from disk: */
62 uint8_t buffer[CHUNK_SIZE];
63 /* "result" is the result vector: */
64 uint8_t result[ENCODED_SIZE + BASE64_ENCODE_FINAL_LENGTH + 1];
65 unsigned nbytes; /* Number of bytes read from stdin */
66 int encoded_bytes; /* total number of bytes encoded per iteration */
67 nbytes = fread(buffer,1,CHUNK_SIZE,stdin);
69 /* We overwrite result with more data */
70 encoded_bytes = base64_encode_update(&b64_ctx, result, nbytes, buffer);
72 if (nbytes < CHUNK_SIZE)
76 werror ("Error reading file: %s\n", strerror(errno));
79 encoded_bytes += base64_encode_final(&b64_ctx,result + encoded_bytes);
81 result[encoded_bytes++] = '\n';
82 if (!write_string (stdout, encoded_bytes, result)
83 || fflush (stdout) != 0)
85 werror ("Error writing file: %s\n", strerror(errno));
91 /* The result vector is written */
92 result[encoded_bytes++] = '\n';
93 if (!write_string (stdout, encoded_bytes, result))
95 werror ("Error writing file: %s\n", strerror(errno));