save pass1 patch

git-svn-id: svn+q:///qpdf/trunk@931 71b93d88-0707-0410-a8cf-f5a4172ac649

TODO

@@ -1,9 +1,3 @@
-2.1
-===
-
- * Remove rc1 from version; search for rc1 in release notes as
-   well...just change rc1 to 2.1 and update the date.
-
 2.2
 ===
 
@@ -21,6 +15,54 @@
 General
 =======
 
+ * For debugging linearization bugs, consider adding an option to save
+   pass 1 of linearization.  This code is sufficient.  Change the
+   interface to allow specification of a pass1 file, which would
+   change the behavior as in this patch.
+
+------------------------------
+Index: QPDFWriter.cc
+===================================================================
+--- QPDFWriter.cc	(revision 920)
++++ QPDFWriter.cc	(working copy)
+@@ -1958,11 +1960,15 @@
+ 
+     // Write file in two passes.  Part numbers refer to PDF spec 1.4.
+ 
++    FILE* XXX = 0;
+     for (int pass = 1; pass <= 2; ++pass)
+     {
+ 	if (pass == 1)
+ 	{
+-	    pushDiscardFilter();
++//	    pushDiscardFilter();
++	    XXX = fopen("/tmp/pass1.pdf", "w");
++	    pushPipeline(new Pl_StdioFile("pass1", XXX));
++	    activatePipelineStack();
+ 	}
+ 
+ 	// Part 1: header
+@@ -2037,7 +2043,8 @@
+ 			    t_lin_first, first_half_start, first_half_end,
+ 			    first_trailer_size,
+ 			    hint_length + second_xref_offset,
+-			    hint_id, hint_offset, hint_length);
++			    hint_id, hint_offset, hint_length,
++			    (pass == 1));
+ 	    int endpos = this->pipeline->getCount();
+ 	    if (pass == 1)
+ 	    {
+@@ -2187,6 +2194,8 @@
+ 
+ 	    // Restore hint offset
+ 	    this->xref[hint_id] = QPDFXRefEntry(1, hint_offset, 0);
++	    fclose(XXX);
++	    XXX = 0;
+ 	}
+     }
+ }
+------------------------------
+
  * Handle embedded files.  PDF Reference 1.7 section 3.10, "File
    Specifications", discusses this.  Once we can definitely recongize
    all embedded files in a docucment, we can update the encryption