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base64.c

/*
 * Written by Poul-Henning Kamp <phk@phk.freebsd.dk>
 *
 * This file is in the public domain.
 *
 * $Id: base64.c 1092 2006-09-18 22:03:54Z phk $
 */

#include <sys/types.h>
#include <stdint.h>
#include "varnishapi.h"

static const char *b64 =
    "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

static char i64[256];

void
base64_init(void)
{
      int i;
      const char *p;

      for (i = 0; i < 256; i++)
            i64[i] = -1;
      for (p = b64, i = 0; *p; p++, i++)
            i64[(int)*p] = i;
      i64['='] = 0;
}

int
base64_decode(char *d, unsigned dlen, const char *s)
{
      unsigned u, v, l;
      int i;

      u = 0;
      l = 0;
      while (*s) {
            for (v = 0; v < 4; v++) {
                  if (!*s)
                        break;
                  i = i64[(int)*s++];
                  if (i < 0)
                        return (-1);
                  u <<= 6;
                  u |= i;
            }
            for (v = 0; v < 3; v++) {
                  if (l >= dlen - 1)
                        return (-1);
                  *d = (u >> 16) & 0xff;
                  u <<= 8;
                  l++;
                  d++;
            }
      }
      *d = '\0';
      return (0);
}

#ifdef TEST_DRIVER
#include <stdio.h>

const char *test1 =
"TWFuIGlzIGRpc3Rpbmd1aXNoZWQsIG5vdCBvbmx5IGJ5IGhpcyByZWFzb24sIGJ1dCBieSB0aGlz"
"IHNpbmd1bGFyIHBhc3Npb24gZnJvbSBvdGhlciBhbmltYWxzLCB3aGljaCBpcyBhIGx1c3Qgb2Yg"
"dGhlIG1pbmQsIHRoYXQgYnkgYSBwZXJzZXZlcmFuY2Ugb2YgZGVsaWdodCBpbiB0aGUgY29udGlu"
"dWVkIGFuZCBpbmRlZmF0aWdhYmxlIGdlbmVyYXRpb24gb2Yga25vd2xlZGdlLCBleGNlZWRzIHRo"
"ZSBzaG9ydCB2ZWhlbWVuY2Ugb2YgYW55IGNhcm5hbCBwbGVhc3VyZS4=";

int
main(int argc, char **argv)
{
      int i;
      char buf[BUFSIZ];
      unsigned l;

      (void)argc;
      (void)argv;

      base64_init();
      l = sizeof buf;
      base64_decode(buf, &l, test1);
      printf("%s\n", buf);
      return (0);
}
#endif

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