Re: Fix for: ImageJ cannot open 48-bit LZW compressed TIFFs

Posted by Olaf Freyer-3 on Jul 19, 2009; 11:48am
URL: http://imagej.273.s1.nabble.com/Re-Fix-for-ImageJ-cannot-open-48-bit-LZW-compressed-TIFFs-tp3691731.html

Thanks alot for including my proposed patch.

During further testing of the code I came across some other 48-bit LZW
compresses TIFFs that cause an IndexOutOfBoundsException with the current
code. It seems like sometimes the decompresses data contained a few bytes
too much.

The simple fix for this issue is:

--- source/ij/io/ImageReader.java       2009-07-19 13:45:10.000000000 +0200
+++ source_fixed/ij/io/ImageReader.java 2009-07-19 13:46:14.000000000 +0200
@@ -558,7 +558,7 @@
                        int value;
                        int channel=0;
                        boolean intel = fi.intelByteOrder;
-                       for (int base=0; base<len; base+=2) {
+                       for (int base=0; base<len && pixel<nPixels; base+=2) {
                                if (intel)
                                        value = ((buffer[base+1]&0xff)<<8) |
(buffer[base]&0xff);
                                else

Regards
  Olaf Freyer