Fix (and add test for) [Bug 1458234]

FossilOrigin-Name: 057f364ddff1f7ff992ef835c8738ceb3ab533e0

1 files changed, 13 insertions, 13 deletions

diff --git a/generic/tkImgGIF.c b/generic/tkImgGIF.c
index 1e2bd64..70f77b0 100644
--- a/generic/tkImgGIF.c
+++ b/generic/tkImgGIF.c
@@ -32,7 +32,7 @@
  * This file also contains code from miGIF. See lower down in file for the
  * applicable copyright notice for that portion.
  *
- * RCS: @(#) $Id: tkImgGIF.c,v 1.31 2005/12/01 03:21:37 hobbs Exp $
+ * RCS: @(#) $Id: tkImgGIF.c,v 1.32 2006/03/27 10:55:49 dkf Exp $
  */
 
 /*
@@ -252,7 +252,7 @@ FileReadGIF(
     int srcX, int srcY)		/* Coordinates of top-left pixel to be used in
 				 * image being read. */
 {
-    int fileWidth, fileHeight;
+    int fileWidth, fileHeight, imageWidth, imageHeight;
     int nBytes, index = 0, argc = 0, i;
     Tcl_Obj **objv;
     Tk_PhotoImageBlock block;
@@ -399,8 +399,8 @@ FileReadGIF(
 	    goto error;
 	}
 
-	fileWidth = LM_to_uint(buf[4], buf[5]);
-	fileHeight = LM_to_uint(buf[6], buf[7]);
+	imageWidth = LM_to_uint(buf[4], buf[5]);
+	imageHeight = LM_to_uint(buf[6], buf[7]);
 
 	bitPixel = 1<<((buf[8]&0x07)+1);
 
@@ -443,7 +443,7 @@ FileReadGIF(
 	     */
 
 	    if (ReadImage(gifConfPtr, interp, (char *)trashBuffer, chan,
-		    fileWidth, fileHeight, colorMap, 0, 0, 0, 0, 0,
+		    imageWidth, imageHeight, colorMap, 0, 0, 0, 0, 0,
 		    -1) != TCL_OK) {
 		goto error;
 	    }
@@ -464,8 +464,8 @@ FileReadGIF(
 	    srcX = 0;
 	}
 
-	if (width > fileWidth) {
-	    width = fileWidth;
+	if (width > imageWidth) {
+	    width = imageWidth;
 	}
 
 	index = LM_to_uint(buf[2], buf[3]);
@@ -474,8 +474,8 @@ FileReadGIF(
 	    destY -= srcY; height += srcY;
 	    srcY = 0;
 	}
-	if (height > fileHeight) {
-	    height = fileHeight;
+	if (height > imageHeight) {
+	    height = imageHeight;
 	}
 
 	if ((width <= 0) || (height <= 0)) {
@@ -487,13 +487,13 @@ FileReadGIF(
 	block.height = height;
 	block.pixelSize = (transparent>=0) ? 4 : 3;
 	block.offset[3] = (transparent>=0) ? 3 : 0;
-	block.pitch = block.pixelSize * fileWidth;
-	nBytes = block.pitch * fileHeight;
+	block.pitch = block.pixelSize * imageWidth;
+	nBytes = block.pitch * imageHeight;
 	block.pixelPtr = (unsigned char *) ckalloc((unsigned) nBytes);
 
 	if (ReadImage(gifConfPtr, interp, (char *) block.pixelPtr, chan,
-		fileWidth, fileHeight, colorMap, fileWidth, fileHeight, srcX,
-		srcY, BitSet(buf[8], INTERLACE), transparent) != TCL_OK) {
+		imageWidth,imageHeight, colorMap, fileWidth,fileHeight,
+		srcX,srcY, BitSet(buf[8],INTERLACE), transparent) != TCL_OK) {
 	    goto error;
 	}
 	break;