* add function decode_hex() that interprets 2 chars as hexdigits representing an...

[citadel.git] / libcitadel / lib / mime_parser.c

diff --git a/libcitadel/lib/mime_parser.c b/libcitadel/lib/mime_parser.c
index 026d0555009cd76d66865dd327b484274091f6c5..76452935a6280cd6ef92e5b27d3e1d8a3f28d4b9 100644 (file)
--- a/libcitadel/lib/mime_parser.c
+++ b/libcitadel/lib/mime_parser.c
@@ -71,6 +71,26 @@ char *fixed_partnum(char *supplied_partnum) {
 }
 
 
+inline unsigned int decode_hex(char *Source)
+{
+       int ret = 0;
+       if (*Source  < 'A') {
+               ret += (*Source - '0');
+       }
+       else {
+               ret += (*Source - 'A' + 10);
+       }
+       ret = ret << 4;
+       if (*(Source + 1) < 'A') {
+               ret += (*(Source + 1) - '0');
+       }
+       else {
+               ret += (*(Source + 1) - 'A' + 10);
+       }
+       if (ret > 255)
+               return 0;
+       return ret;
+}
 
 /*
  * Convert "quoted-printable" to binary.  Returns number of bytes decoded.
@@ -94,7 +114,7 @@ int CtdlDecodeQuotedPrintable(char *decoded, char *encoded, int sourcelen) {
                else if (encoded[pos] == '=')
                {
                        ch = 0;
-                       sscanf(&encoded[pos+1], "%02x", &ch);
+                       ch = decode_hex(&encoded[pos+1]);
                        pos += 3;
                        decoded[decoded_length++] = ch;
                }