Properly decompress erroneous CMYK/YCCK images whose K component has an ID of 1 instead of 4 (this is to support SumatraPDF)

ChangeLog.txt

@@ -24,6 +24,11 @@ because libjpeg-turbo's distributed version of jconfig.h contained an INLINE
 macro, which conflicted with a similar macro in DevIL.  This macro is used only
 internally when building libjpeg-turbo, so it was moved into config.h.
 
+[6] libjpeg-turbo will now correctly decompress erroneous CMYK/YCCK JPEGs whose
+K component is assigned a component ID of 1 instead of 4.  Although these files
+are in violation of the spec, other JPEG implementations handle them
+correctly.
+
 
 1.1.90 (1.2 beta1)
 ==================

jdmarker.c

@@ -2,6 +2,7 @@
  * jdmarker.c
  *
  * Copyright (C) 1991-1998, Thomas G. Lane.
+ * Copyright (C) 2012, D. R. Commander.
  * This file is part of the Independent JPEG Group's software.
  * For conditions of distribution and use, see the accompanying README file.
  *
@@ -322,13 +323,16 @@ get_sos (j_decompress_ptr cinfo)
 
   /* Collect the component-spec parameters */
 
+  for (i = 0; i < n; i++)
+    cinfo->cur_comp_info[i] = NULL;
+
   for (i = 0; i < n; i++) {
     INPUT_BYTE(cinfo, cc, return FALSE);
     INPUT_BYTE(cinfo, c, return FALSE);
     
     for (ci = 0, compptr = cinfo->comp_info; ci < cinfo->num_components;
 	 ci++, compptr++) {
-      if (cc == compptr->component_id)
+      if (cc == compptr->component_id && !cinfo->cur_comp_info[ci])
 	goto id_found;
     }