[patch libiberty]: Fix PR 543413

[Kai Tietz <ktietz70@googlemail.com>]

Hi,

this patch fixes wrong handling of cases that bitness of size_t is
wider as 32-bit.

ChangeLog

2013-01-30  Kai Tietz  <ktietz@redhat.com>

	PR other/543413
	* md5.c (md5_process_block):  Handle case that size_t is
	a wider-integer-scalar a 32-bit unsigned integer.

Tested for x86_64-unknown-linux-gnu, i686-pc-cygwin, and
x86_64-w64-mingw32.  Ok for apply?

Regards,
Kai

Index: md5.c
===================================================================
--- md5.c	(Revision 195578)
+++ md5.c	(Arbeitskopie)
@@ -293,8 +293,7 @@ md5_process_block (const void *buffer, size_t len,
      length of the file up to 2^64 bits.  Here we only compute the
      number of bytes.  Do a double word increment.  */
   ctx->total[0] += len;
-  if (ctx->total[0] < len)
-    ++ctx->total[1];
+  ctx->total[1] += ((len >> 31) >> 1) + (ctx->total[0] < len);

   /* Process all bytes in the buffer with 64 bytes in each round of
      the loop.  */