X-Git-Url: https://git.exim.org/exim.git/blobdiff_plain/f9ba5e2255cf18092750fffacb6a9603571a2be5..a85c067ba6c6940512cf57ec213277a370d87e70:/src/src/base64.c

diff --git a/src/src/base64.c b/src/src/base64.c
index dbbd6a40e..14e8cfffe 100644
--- a/src/src/base64.c
+++ b/src/src/base64.c
@@ -4,8 +4,10 @@
 
 /* Copyright (c) Tom Kistner <tom@duncanthrax.net> 2004, 2015 */
 /* License: GPL */
+/* SPDX-License-Identifier: GPL-2.0-only */
 
 /* Copyright (c) University of Cambridge 1995 - 2018 */
+/* Copyright (c) The Exim Maintainers 2020 - 2022 */
 /* See the file NOTICE for conditions of use and distribution. */
 
 
@@ -38,7 +40,7 @@ ssize_t
 mime_decode_base64(FILE * in, FILE * out, uschar * boundary)
 {
 uschar ibuf[MIME_MAX_LINE_LENGTH], obuf[MIME_MAX_LINE_LENGTH];
-uschar *ipos, *opos;
+uschar *opos;
 ssize_t len, size = 0;
 int bytestate = 0;
 
@@ -52,7 +54,7 @@ while (Ufgets(ibuf, MIME_MAX_LINE_LENGTH, in) != NULL)
      )
     break;
 
-  for (ipos = ibuf ; *ipos != '\r' && *ipos != '\n' && *ipos != 0; ++ipos)
+  for (uschar * ipos = ibuf ; *ipos != '\r' && *ipos != '\n' && *ipos; ++ipos)
     if (*ipos == '=')			/* skip padding */
       ++bytestate;
 
@@ -156,10 +158,10 @@ b64decode(const uschar *code, uschar **ptr)
 int x, y;
 uschar *result;
 
-{
+ {
   int l = Ustrlen(code);
-  *ptr = result = store_get(1 + l/4 * 3 + l%4);
-}
+  *ptr = result = store_get(1 + l/4 * 3 + l%4, code);
+ }
 
 /* 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. */
@@ -173,7 +175,7 @@ while ((x = *code++) != 0)
 
   while (isspace(y = *code++)) ;
   /* debug_printf("b64d: '%c'\n", y); */
-  if (y == 0 || (y = dec64table[y]) == 255)
+  if (y > 127 || (y = dec64table[y]) == 255)
     return -1;
 
   *result++ = (x << 2) | (y >> 4);
@@ -233,6 +235,7 @@ would probably run more slowly.
 Arguments:
   clear       points to the clear text bytes
   len         the number of bytes to encode
+  proto_mem   taint indicator
 
 Returns:      a pointer to the zero-terminated base 64 string, which
               is in working store
@@ -242,10 +245,10 @@ static uschar *enc64table =
   US"ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
 
 uschar *
-b64encode(uschar *clear, int len)
+b64encode_taint(const uschar * clear, int len, const void * proto_mem)
 {
-uschar *code = store_get(4*((len+2)/3) + 1);
-uschar *p = code;
+uschar * code = store_get(4*((len+2)/3) + 1, proto_mem);
+uschar * p = code;
 
 while (len-- >0)
   {
@@ -283,6 +286,12 @@ while (len-- >0)
 return code;
 }
 
+uschar *
+b64encode(const uschar * clear, int len)
+{
+return b64encode_taint(clear, len, clear);
+}
+
 
 /* End of base64.c */
 /* vi: sw ai sw=2