+++ /dev/null
-/*************************************************
-* Exim - an Internet mail transport agent *
-*************************************************/
-
-/* Copyright (c) University of Cambridge 1995 - 2009 */
-/* See the file NOTICE for conditions of use and distribution. */
-
-#include "../exim.h"
-
-
-/*************************************************
-* Decode byte-string in base 64 *
-*************************************************/
-
-/* This function decodes a string in base 64 format as defined in RFC 2045
-(MIME) and required by the SMTP AUTH extension (RFC 2554). The decoding
-algorithm is written out in a straightforward way. Turning it into some kind of
-compact loop is messy and would probably run more slowly.
-
-Arguments:
- code points to the coded string, zero-terminated
- ptr where to put the pointer to the result, which is in
- dynamic store, and zero-terminated
-
-Returns: the number of bytes in the result,
- or -1 if the input was malformed
-
-A zero is added on to the end to make it easy in cases where the result is to
-be interpreted as text. This is not included in the count. */
-
-static uschar dec64table[] = {
- 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, /* 0-15 */
- 255,255,255,255,255,255,255,255,255,255,255,255,255,255,255,255, /* 16-31 */
- 255,255,255,255,255,255,255,255,255,255,255, 62,255,255,255, 63, /* 32-47 */
- 52, 53, 54, 55, 56, 57, 58, 59, 60, 61,255,255,255,255,255,255, /* 48-63 */
- 255, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, /* 64-79 */
- 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25,255,255,255,255,255, /* 80-95 */
- 255, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, /* 96-111 */
- 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51,255,255,255,255,255 /* 112-127*/
-};
-
-int
-auth_b64decode(uschar *code, uschar **ptr)
-{
-register int x, y;
-uschar *result = store_get(3*(Ustrlen(code)/4) + 1);
-
-*ptr = result;
-
-/* Each cycle of the loop handles a quantum of 4 input bytes. For the last
-quantum this may decode to 1, 2, or 3 output bytes. */
-
-while ((x = (*code++)) != 0)
- {
- if (x > 127 || (x = dec64table[x]) == 255) return -1;
- if ((y = (*code++)) == 0 || (y = dec64table[y]) == 255)
- return -1;
- *result++ = (x << 2) | (y >> 4);
-
- if ((x = (*code++)) == '=')
- {
- if (*code++ != '=' || *code != 0) return -1;
- }
- else
- {
- if (x > 127 || (x = dec64table[x]) == 255) return -1;
- *result++ = (y << 4) | (x >> 2);
- if ((y = (*code++)) == '=')
- {
- if (*code != 0) return -1;
- }
- else
- {
- if (y > 127 || (y = dec64table[y]) == 255) return -1;
- *result++ = (x << 6) | y;
- }
- }
- }
-
-*result = 0;
-return result - *ptr;
-}
-
-/* End of b64decode.c */