/* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2004, 2015 */
/* License: GPL */
-/* Copyright (c) University of Cambridge 1995 - 2015 */
+/* Copyright (c) University of Cambridge 1995 - 2018 */
/* See the file NOTICE for conditions of use and distribution. */
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
+ allocated store, and zero-terminated
Returns: the number of bytes in the result,
or -1 if the input was malformed
};
int
-b64decode(uschar *code, uschar **ptr)
+b64decode(const uschar *code, uschar **ptr)
{
+
int x, y;
-uschar *result = store_get(3*(Ustrlen(code)/4) + 1);
+uschar *result;
-*ptr = result;
+{
+ int l = Ustrlen(code);
+ *ptr = result = store_get(1 + l/4 * 3 + l%4);
+}
/* 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 (isspace(x)) continue;
+ /* debug_printf("b64d: '%c'\n", x); */
if (x > 127 || (x = dec64table[x]) == 255) return -1;
while (isspace(y = *code++)) ;
- if (y == 0 || (y = dec64table[y]) == 255)
+ /* debug_printf("b64d: '%c'\n", y); */
+ if (y > 127 || (y = dec64table[y]) == 255)
return -1;
*result++ = (x << 2) | (y >> 4);
+ /* debug_printf("b64d: -> %02x\n", result[-1]); */
while (isspace(x = *code++)) ;
- if (x == '=')
+ /* debug_printf("b64d: '%c'\n", x); */
+ if (x == '=') /* endmarker, but there should be another */
{
while (isspace(x = *code++)) ;
- if (x != '=' || *code != 0) return -1;
+ /* debug_printf("b64d: '%c'\n", x); */
+ if (x != '=') return -1;
+ while (isspace(y = *code++)) ;
+ if (y != 0) return -1;
+ /* debug_printf("b64d: DONE\n"); */
+ break;
}
else
{
if (x > 127 || (x = dec64table[x]) == 255) return -1;
*result++ = (y << 4) | (x >> 2);
+ /* debug_printf("b64d: -> %02x\n", result[-1]); */
while (isspace(y = *code++)) ;
+ /* debug_printf("b64d: '%c'\n", y); */
if (y == '=')
{
- if (*code != 0) return -1;
+ while (isspace(y = *code++)) ;
+ if (y != 0) return -1;
+ /* debug_printf("b64d: DONE\n"); */
+ break;
}
else
{
if (y > 127 || (y = dec64table[y]) == 255) return -1;
*result++ = (x << 6) | y;
+ /* debug_printf("b64d: -> %02x\n", result[-1]); */
}
}
}
}
-/*************************************************
- *************************************************
- *************************************************
- *************************************************
- *************************************************
- *************************************************
- *************************************************
- *************************************************
- *************************************************
- *************************************************
- *************************************************
- *************************************************
- *************************************************
- *************************************************
- *************************************************
- *************************************************/
-
/*************************************************
* Encode byte-string in base 64 *
*************************************************/
while (len-- >0)
{
- register int x, y;
+ int x, y;
x = *clear++;
*p++ = enc64table[(x >> 2) & 63];