[gmime: 16/24] Use unsigned integer arithmetic in parser_scan_content()

[Jeffrey Stedfast <fejj src gnome org>]

commit e8dec4091e946ddffc1cb9111680a9b5e3d085f0
Author: Jakub Wilk <jwilk jwilk net>
Date:   Mon Jul 31 12:34:29 2017 +0200

    Use unsigned integer arithmetic in parser_scan_content()
    
    "mask - 0x01010101" could cause signed integer overflow, which is undefined
    behavior.

 gmime/gmime-parser.c |   10 +++++-----
 1 files changed, 5 insertions(+), 5 deletions(-)
---
diff --git a/gmime/gmime-parser.c b/gmime/gmime-parser.c
index 0b96a5a..edb5447 100644
--- a/gmime/gmime-parser.c
+++ b/gmime/gmime-parser.c
@@ -1441,11 +1441,11 @@ parser_scan_content (GMimeParser *parser, GMimeStream *content, gboolean *empty)
        BoundaryType found = BOUNDARY_NONE;
        char *aligned, *start, *inend;
        register char *inptr;
-       register int *dword;
+       register unsigned int *dword;
        size_t nleft, len;
        size_t atleast;
        gint64 pos;
-       int mask;
+       unsigned int mask;
        char c;
        
        d(printf ("scan-content\n"));
@@ -1494,11 +1494,11 @@ parser_scan_content (GMimeParser *parser, GMimeStream *content, gboolean *empty)
                        *aligned = c;
                        
                        if (inptr == aligned && c != '\n') {
-                               dword = (int *) inptr;
+                               dword = (unsigned int *) inptr;
                                
                                do {
-                                       mask = *dword++ ^ 0x0A0A0A0A;
-                                       mask = ((mask - 0x01010101) & (~mask & 0x80808080));
+                                       mask = *dword++ ^ 0x0A0A0A0AU;
+                                       mask = ((mask - 0x01010101U) & (~mask & 0x80808080U));
                                } while (mask == 0);
                                
                                inptr = (char *) (dword - 1);