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Properly initialize the page buffer to the default pixel value.
This caused, among other potential bugs, garbage and overlay
effects under some malloc implementatons, though not on GNU/Linux.

Fixes Ghostscript bugs 687530 and 687609. Thanks to Oleg Panashchenko 
for analysis.


git-svn-id: http://svn.ghostscript.com/jbig2dec/trunk@314 ded80894-8fb9-0310-811b-c03f3676ab4d

--- a/jbig2_page.c

+++ b/jbig2_page.c

@@ -150,6 +150,9 @@

         return jbig2_error(ctx, JBIG2_SEVERITY_FATAL, segment->number,

             "failed to allocate buffer for page image");

     } else {

+	/* 8.2 (3) fill the page with the default pixel value */

+	memset(page->image->data, (page->flags & 4) ? 0xFF : 0x00,

+	    page->image->stride*page->image->height);

         jbig2_error(ctx, JBIG2_SEVERITY_DEBUG, segment->number,

             "allocated %dx%d page image (%d bytes)",

             page->image->width, page->image->height,