From 2506070875222aa5084164b7339357d09d72a358 Mon Sep 17 00:00:00 2001
From: Cristy <mikayla-grace@urban-warrior.org>
Date: Thu, 21 Feb 2019 19:59:11 -0500
Subject: [PATCH] ...

---
 coders/miff.c | 12 +++++++-----
 coders/mpc.c  | 13 ++++++++-----
 2 files changed, 15 insertions(+), 10 deletions(-)

diff --git a/coders/miff.c b/coders/miff.c
index 8f6f6b3b4..0de54fb94 100644
--- a/coders/miff.c
+++ b/coders/miff.c
@@ -1140,28 +1140,30 @@ static Image *ReadMIFFImage(const ImageInfo *image_info,
         /*
           Image directory.
         */
-        length=MagickPathExtent;
+        extent=MagickPathExtent;
         image->directory=AcquireString((char *) NULL);
         p=image->directory;
+        length=0;
         do
         {
           *p='\0';
-          if ((strlen(image->directory)+MagickPathExtent) >= length)
+          if ((length+MagickPathExtent) >= extent)
             {
               /*
                 Allocate more memory for the image directory.
               */
-              length<<=1;
+              extent<<=1;
               image->directory=(char *) ResizeQuantumMemory(image->directory,
-                length+MagickPathExtent,sizeof(*image->directory));
+                extent+MagickPathExtent,sizeof(*image->directory));
               if (image->directory == (char *) NULL)
                 ThrowMIFFException(CorruptImageError,"UnableToReadImageData");
-              p=image->directory+strlen(image->directory);
+              p=image->directory+length;
             }
           c=ReadBlobByte(image);
           if (c == EOF)
             break;
           *p++=(char) c;
+          length++;
         } while (c != (int) '\0');
       }
     if (profiles != (LinkedListInfo *) NULL)
diff --git a/coders/mpc.c b/coders/mpc.c
index 5ebea0645..35df8af89 100644
--- a/coders/mpc.c
+++ b/coders/mpc.c
@@ -179,6 +179,7 @@ static Image *ReadMPCImage(const ImageInfo *image_info,ExceptionInfo *exception)
 
   size_t
     depth,
+    extent,
     length;
 
   ssize_t
@@ -809,20 +810,21 @@ static Image *ReadMPCImage(const ImageInfo *image_info,ExceptionInfo *exception)
         /*
           Image directory.
         */
-        length=MagickPathExtent;
+        extent=MagickPathExtent;
         image->directory=AcquireString((char *) NULL);
         p=image->directory;
+        length=0;
         do
         {
           *p='\0';
-          if ((strlen(image->directory)+MagickPathExtent) >= length)
+          if ((length+MagickPathExtent) >= extent)
             {
               /*
                 Allocate more memory for the image directory.
               */
-              length<<=1;
+              extent<<=1;
               image->directory=(char *) ResizeQuantumMemory(image->directory,
-                length+MagickPathExtent,sizeof(*image->directory));
+                extent+MagickPathExtent,sizeof(*image->directory));
               if (image->directory == (char *) NULL)
                 {
                   if (profiles != (LinkedListInfo *) NULL)
@@ -830,12 +832,13 @@ static Image *ReadMPCImage(const ImageInfo *image_info,ExceptionInfo *exception)
                   ThrowReaderException(CorruptImageError,
                     "UnableToReadImageData");
                 }
-              p=image->directory+strlen(image->directory);
+              p=image->directory+length;
             }
           c=ReadBlobByte(image);
           if (c == EOF)
             break;
           *p++=(char) c;
+          length++;
         } while (c != (int) '\0');
       }
     if (profiles != (LinkedListInfo *) NULL)
-- 
2.40.0