int main(void)
{
static const char b64[] =
"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
unsigned i_bits = 0;
int i_shift = 0;
int out_len = 0;
int in;
#define putb64() \
do { \
putchar(b64[(i_bits << 6 >> i_shift) & 0x3f]); \
out_len++; \
i_shift -= 6; \
} while (0)
while ((in = getchar()) != EOF) {
i_bits = (i_bits << 8) + in;
i_shift += 8;
while (i_shift > 6)
putb64();
}
while (i_shift > 0)
putb64();
while (out_len++ & 3)
putchar('=');
putchar('\n');
return 0;
}
static void
hybi10_decode(FILE *in, int outfd)
{
FILE *out;
unsigned char ch, masks[4];
char inb[4];
size_t inblen = 0;
uint64_t i, framelen;
out = fdopen(outfd, "w");
if (out == NULL) {
perror("fdopen");
die(1);
}
for (;;) {
/* Frame header. */
ch = pgetc(in);
if (ch != 0x81) {
DPRINTF("unsupported packet received: %#hhx", ch);
die(1);
}
/* Payload length. */
framelen = hybi10_getlength(in);
hybi10_getmasks(in, masks);
for (i = 0; i < framelen; i++) {
ch = pgetc(in) ^ masks[i % 4];
if (!((ch >= 'A' && ch <= 'Z') ||
(ch >= 'a' && ch <= 'z') ||
(ch >= '0' && ch <= '9') ||
ch == '+' || ch == '/' || ch == '=')) {
DPRINTF("non-Base64 character received");
die(1);
}
/* Base64 character. */
inb[inblen++] = ch;
if (inblen == sizeof inb)
putb64(out, inb, &inblen);
}
/* Frame trailer. */
putb64(out, inb, &inblen);
if (fflush(out) == -1) {
perror("fflush");
die(1);
}
}
}
static void
hixie76_decode(FILE *in, int outfd)
{
FILE *out;
unsigned char ch;
char inb[4];
size_t inblen = 0;
out = fdopen(outfd, "w");
if (out == NULL) {
perror("fdopen");
die(1);
}
for (;;) {
/* Frame header. */
ch = pgetc(in);
if (ch != 0x00) {
DPRINTF("unsupported packet received: %#hhx", ch);
die(1);
}
while ((ch = pgetc(in)) != 0xff) {
if (!((ch >= 'A' && ch <= 'Z') ||
(ch >= 'a' && ch <= 'z') ||
(ch >= '0' && ch <= '9') ||
ch == '+' || ch == '/' || ch == '=')) {
DPRINTF("non-Base64 character received");
die(1);
}
/* Base64 character. */
inb[inblen++] = ch;
if (inblen == sizeof inb)
putb64(out, inb, &inblen);
}
/* Frame trailer. */
putb64(out, inb, &inblen);
if (fflush(out) == -1) {
perror("fflush");
die(1);
}
}
}
