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Rev 154 Rev 178
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   }
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   }
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   *pos = 0; // drop a string terminator where the decoded stream ends (but don't take it in account in the length)
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   *pos = 0; // drop a string terminator where the decoded stream ends (but don't take it in account in the length)
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   return (pos - dest); // source has been base64-decoded in dest, return decoded length
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   return (pos - dest); // source has been base64-decoded in dest, return decoded length
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}
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}
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#ifdef TEST_BASE64
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#include <stdlib.h>
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#include <string.h>
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int main (int argc, char **argv)
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{
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   FILE *fp;
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   char *inbuf;
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   size_t inbuf_size;
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   char *outbuf;
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   size_t outbuf_size;
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   int should_decode;
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   if ((argc < 4) || ((strcmp (argv[1], "encode") != 0) && (strcmp (argv[1], "decode") != 0)))
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   {
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      fprintf (stderr, "usage: %s <encode|decode> <infile> <outfile>\n", argv[0]);
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      exit (1);
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   }
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   should_decode = (strcmp (argv[1], "decode") == 0);
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   fp = fopen (argv[2], "rb");
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   if (fp == NULL)
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   {
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      fprintf (stderr, "error: unable to open input file '%s'\n", argv[2]);
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      exit (1);
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   }
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   fseek (fp, 0, SEEK_END);
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   inbuf_size = ftell (fp);
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   fseek (fp, 0, SEEK_SET);
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   inbuf = (char *) malloc (inbuf_size);
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   if (inbuf == NULL)
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   {
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      fprintf (stderr, "error: malloc() failed for %zd bytes while reading input file '%s'\n", inbuf_size, argv[2]);
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      exit (1);
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   }
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   fread (inbuf, inbuf_size, 1, fp);
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   fclose (fp);
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   outbuf_size = 2 * inbuf_size;
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   outbuf = (char *) malloc (outbuf_size);
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   if (outbuf == NULL)
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   {
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      fprintf (stderr, "error: malloc() failed for %zd bytes while preparing output file '%s'\n", outbuf_size, argv[3]);
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      exit (1);
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   }
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   if (should_decode)
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      outbuf_size = base64_decode ((unsigned char *) outbuf, (unsigned char *) inbuf, inbuf_size);
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   else
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      outbuf_size = base64_encode (outbuf, inbuf, inbuf_size);
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   fp = fopen (argv[3], "wb");
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   if (fp == NULL)
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   {
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      fprintf (stderr, "error: unable to open output file '%s'\n", argv[3]);
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      exit (1);
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   }
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   fwrite (outbuf, outbuf_size, 1, fp);
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   fclose (fp);
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   free (inbuf);
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   free (outbuf);
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   return (0);
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}
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#endif // TEST_BASE64