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#include <stddef.h> // size_t
#include <stdio.h> // fopen()
#include <string.h> // strlen()
#include <getopt.h>
#include "../include/libbase64.h"
#define BUFSIZE 1024 * 1024
static char buf[BUFSIZE];
static char out[(BUFSIZE * 5) / 3]; // Technically 4/3 of input, but take some margin
size_t nread;
size_t nout;
static int
enc (FILE *fp)
{
int ret = 1;
struct base64_state state;
base64_stream_encode_init(&state, 0);
while ((nread = fread(buf, 1, BUFSIZE, fp)) > 0) {
base64_stream_encode(&state, buf, nread, out, &nout);
if (nout) {
fwrite(out, nout, 1, stdout);
}
if (feof(fp)) {
break;
}
}
if (ferror(fp)) {
fprintf(stderr, "read error\n");
ret = 0;
goto out;
}
base64_stream_encode_final(&state, out, &nout);
if (nout) {
fwrite(out, nout, 1, stdout);
}
out: fclose(fp);
fclose(stdout);
return ret;
}
static int
dec (FILE *fp)
{
int ret = 1;
struct base64_state state;
base64_stream_decode_init(&state, 0);
while ((nread = fread(buf, 1, BUFSIZE, fp)) > 0) {
if (!base64_stream_decode(&state, buf, nread, out, &nout)) {
fprintf(stderr, "decoding error\n");
ret = 0;
goto out;
}
if (nout) {
fwrite(out, nout, 1, stdout);
}
if (feof(fp)) {
break;
}
}
if (ferror(fp)) {
fprintf(stderr, "read error\n");
ret = 0;
}
out: fclose(fp);
fclose(stdout);
return ret;
}
int
main (int argc, char **argv)
{
char *file;
FILE *fp;
int decode = 0;
// Parse options:
for (;;)
{
int c;
int opt_index = 0;
static struct option opt_long[] = {
{ "decode", 0, 0, 'd' },
{ 0, 0, 0, 0 }
};
if ((c = getopt_long(argc, argv, "d", opt_long, &opt_index)) == -1) {
break;
}
switch (c)
{
case 'd':
decode = 1;
break;
}
}
// No options left on command line? Read from stdin:
if (optind >= argc) {
fp = stdin;
}
// One option left on command line? Treat it as a file:
else if (optind + 1 == argc) {
file = argv[optind];
if (strcmp(file, "-") == 0) {
fp = stdin;
}
else if ((fp = fopen(file, "rb")) == NULL) {
printf("cannot open %s\n", file);
return 1;
}
}
// More than one option left on command line? Syntax error:
else {
printf("Usage: %s <file>\n", argv[0]);
return 1;
}
// Invert return codes to create shell return code:
return (decode) ? !dec(fp) : !enc(fp);
}
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