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/*
* UNG's Not GNU
*
* Copyright (c) 2011-2019, Jakob Kaivo <jkk@ung.org>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*/
#define _XOPEN_SOURCE 700
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
static const char *b64s =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
static int encode(FILE * in, char *out, int mode, int b64)
{
char bin[3], bout[76];
int nread = 0, lread = 0, lpos = 0;
int linelength = b64 ? 54 : 43;
int i;
printf("begin%s %03o %s\n", b64 ? "-base64" : "", mode, out);
while (!feof(in)) {
nread = fread(bin, sizeof(char), 3, in);
if (nread > 0) {
bout[lpos++] = (bin[0] >> 2) & 0x3f;
bout[lpos++] =
((bin[0] << 4) | ((bin[1] >> 4) & 0xf)) & 0x3f;
bout[lpos++] =
((bin[1] << 2) | ((bin[2] >> 6) & 0x3)) & 0x3f;
bout[lpos++] = (bin[2]) & 0x3f;
bin[0] = bin[1] = bin[2] = 0;
lread += nread;
}
if (feof(in) || nread == 0 || lread > linelength) {
for (i = 0; i < lpos; i++)
bout[i] = b64 ? b64s[bout[i]] : bout[i] + 0x20;
if (b64) {
if (nread == 1)
bout[lpos - 2] = '=';
if (nread == 1 || nread == 2)
bout[lpos - 1] = '=';
}
if (!b64)
putchar(0x20 + lread);
fwrite(bout, sizeof(char), lpos, stdout);
fputc('\n', stdout);
lread = 0;
lpos = 0;
}
}
if (b64)
printf("====\n");
else
printf("%c\nend\n", 0x20);
return 0;
}
int main(int argc, char *argv[])
{
int b64 = 0, mode = 0644, c;
FILE *input;
struct stat st;
while ((c = getopt(argc, argv, ":m")) != -1) {
switch (c) {
case 'm':
b64 = 1;
break;
default:
return 1;
}
}
if (argc - optind == 2) {
input = fopen(argv[optind++], "r");
if (fstat(fileno(input), &st) == 0)
mode = st.st_mode & 0777;
} else if (argc - optind == 1)
input = stdin;
else
return 1;
if (input == NULL)
return 1; // File I/O error
return encode(input, argv[optind], mode, b64);
}
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