Re: Xpdf fuckware

[Adam Langley <agl@linuxpower.org>]

Ok, it seems that people don't want xpdf to disallow copying etc, but
do wish to compromise with the author's wishes.

So, a new patch: By default xpdf (and pdftotext, and pdftops) act
normally - not allowing things if the bit are set.

If you try to do something not allowed, a message is printed to
stderr:

"Error: Copying of text from this document is not allowed. Use
-ignoreperms option to do so anyway"

If you give the -ignoreperms option to any of the xpdf programs it
runs uncrippled.  Everyone happy?

AGL

-- 
Never underestimate the power of a small tactical nuclear weapon.

--- XRef.cc	Mon Dec  4 04:28:07 2000
+++ ../../xpdf-aclean/xpdf/XRef.cc	Sun Mar 11 17:28:01 2001
@@ -36,6 +36,7 @@
 // Permission bits
 //------------------------------------------------------------------------
 
+bool ignore_perms;
 #define permPrint    (1<<2)
 #define permChange   (1<<3)
 #define permCopy     (1<<4)
@@ -492,6 +493,8 @@
 GBool XRef::okToPrint() {
 #ifndef NO_DECRYPTION
   if (!(permFlags & permPrint)) {
+    if (ignore_perms)
+      return gTrue;
     return gFalse;
   }
 #endif
@@ -501,6 +504,8 @@
 GBool XRef::okToChange() {
 #ifndef NO_DECRYPTION
   if (!(permFlags & permChange)) {
+    if (ignore_perms)
+      return gTrue;
     return gFalse;
   }
 #endif
@@ -510,6 +515,8 @@
 GBool XRef::okToCopy() {
 #ifndef NO_DECRYPTION
   if (!(permFlags & permCopy)) {
+    if (ignore_perms)
+      return gTrue;
     return gFalse;
   }
 #endif
@@ -519,6 +526,8 @@
 GBool XRef::okToAddNotes() {
 #ifndef NO_DECRYPTION
   if (!(permFlags & permNotes)) {
+    if (ignore_perms)
+      return gTrue;
     return gFalse;
   }
 #endif
--- XRef.h	Mon Dec  4 04:28:07 2000
+++ XRef.h	Sun Mar 11 17:42:49 2001
@@ -23,6 +23,8 @@
 // XRef
 //------------------------------------------------------------------------
 
+extern bool ignore_perms;
+
 struct XRefEntry {
   int offset;
   int gen;
--- pdftops.cc	Mon Dec  4 04:28:07 2000
+++ pdftops.cc	Sun Mar 11 18:00:27 2001
@@ -67,6 +67,8 @@
    "print usage information"},
   {"-help",   argFlag,     &printHelp,      0,
    "print usage information"},
+  {"-ignoreperms", argFlag,&ignore_perms,   0,
+   "ignore permissions on the document"},
   {NULL}
 };
 
@@ -122,7 +124,7 @@
 
   // check for print permission
   if (!doc->okToPrint()) {
-    error(-1, "Printing this document is not allowed.");
+    error(-1, "Printing this document is not allowed. Use -ignoreperms option to do so anyway");
     goto err1;
   }
 
--- pdftotext.cc	Mon Dec  4 04:28:07 2000
+++ pdftotext.cc	Sun Mar 11 17:54:40 2001
@@ -66,6 +66,8 @@
    "print usage information"},
   {"-help",   argFlag,     &printHelp,     0,
    "print usage information"},
+  {"-ignoreperms", argFlag, &ignore_perms, 0,
+   "ignore permissions on the document"},
   {NULL}
 };
 
@@ -114,7 +116,7 @@
 
   // check for copy permission
   if (!doc->okToCopy()) {
-    error(-1, "Copying of text from this document is not allowed.");
+    error(-1, "Copying of text from this document is not allowed. Use -ignoreperms option to do so anyway");
     goto err;
   }
 
--- xpdf.cc	Mon Dec  4 04:28:07 2000
+++ xpdf.cc	Sun Mar 11 18:16:42 2001
@@ -219,6 +219,7 @@
   {"-paperw",        ".psPaperWidth",    XrmoptionSepArg,  NULL},
   {"-paperh",        ".psPaperHeight",   XrmoptionSepArg,  NULL},
   {"-level1",        ".psLevel1",        XrmoptionNoArg,   (XPointer)"false"},
+  {"-ignoreperms",  ".ignoreperms",    XrmoptionNoArg,   (XPointer) "on"},
   {NULL}
 };
 
@@ -286,6 +287,8 @@
    "print usage information"},
   {"-help",       argFlag,        &printHelp,     0,
    "print usage information"},
+  {"-ignoreperms",argFlagDummy,        NULL,           0,
+   "ignore permissions on this document"},
   {NULL}
 };
 
@@ -542,6 +545,10 @@
   paperColor = app->getColorResource("paperColor", "white",
 				     WhitePixel(display, app->getScreenNum()),
 				     NULL);
+
+  // handle permissions
+  ignore_perms = app->getBoolResource ("ignoreperms", gFalse);
+  
 #if JAPANESE_SUPPORT
   useEUCJP = app->getBoolResource("eucjp", gFalse);
 #else
@@ -1229,7 +1236,7 @@
 	s = out->getText(selectXMin, selectYMin, selectXMax, selectYMax);
 	win->setSelection(NULL, s);
       } else {
-	error(-1, "Copying of text from this document is not allowed.");
+	error(-1, "Copying of text from this document is not allowed. Use -ignoreperms option to do so anyway");
       }
 #endif
 
@@ -2129,7 +2136,7 @@
       }
       delete psOut;
     } else {
-      error(-1, "Printing this document is not allowed.");
+      error(-1, "Printing this document is not allowed. Use -ignoreperms option to do so anyway");
     }
 
     delete psDialog;

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