From 09175e457852c585a68a86d43280f7e0790a4a3b Mon Sep 17 00:00:00 2001
From: Jay Berkenbilt <ejb@ql.org>
Date: Mon, 19 Oct 2009 00:17:11 +0000
Subject: more testing, bug fix for linearized aes encrypted files

git-svn-id: svn+q:///qpdf/trunk@824 71b93d88-0707-0410-a8cf-f5a4172ac649
---
 libqpdf/QPDFWriter.cc | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 58 insertions(+), 1 deletion(-)

(limited to 'libqpdf/QPDFWriter.cc')

diff --git a/libqpdf/QPDFWriter.cc b/libqpdf/QPDFWriter.cc
index d094aa66..3c1640f7 100644
--- a/libqpdf/QPDFWriter.cc
+++ b/libqpdf/QPDFWriter.cc
@@ -344,6 +344,52 @@ QPDFWriter::copyEncryptionParameters()
     }
 }
 
+void
+QPDFWriter::disableIncompatbleEncryption(float v)
+{
+    if (! this->encrypted)
+    {
+	return;
+    }
+
+    bool disable = false;
+    if (v < 1.3)
+    {
+	disable = true;
+    }
+    else
+    {
+	int V = atoi(encryption_dictionary["/V"].c_str());
+	int R = atoi(encryption_dictionary["/R"].c_str());
+	if (v < 1.4)
+	{
+	    if ((V > 1) || (R > 2))
+	    {
+		disable = true;
+	    }
+	}
+	else if (v < 1.5)
+	{
+	    if ((V > 2) || (R > 3))
+	    {
+		disable = true;
+	    }
+	}
+	else if (v < 1.6)
+	{
+	    if (this->encrypt_use_aes)
+	    {
+		disable = true;
+	    }
+	}
+    }
+    if (disable)
+    {
+	QTC::TC("qpdf", "QPDFWriter forced version disabled encryption");
+	this->encrypted = false;
+    }
+}
+
 void
 QPDFWriter::setEncryptionParametersInternal(
     int V, int R, int key_len, long P,
@@ -965,7 +1011,7 @@ QPDFWriter::unparseObject(QPDFObjectHandle object, int level,
 		Buffer* buf = bufpl.getBuffer();
 		val = QPDF_String(
 		    std::string((char*)buf->getBuffer(),
-				(size_t)buf->getSize())).unparse();
+				(size_t)buf->getSize())).unparse(true);
 		delete buf;
 	    }
 	    else
@@ -1423,6 +1469,17 @@ QPDFWriter::write()
 	copyEncryptionParameters();
     }
 
+    if (! this->forced_pdf_version.empty())
+    {
+	float v = atof(this->forced_pdf_version.c_str());
+	disableIncompatbleEncryption(v);
+	if (v < 1.5)
+	{
+	    QTC::TC("qpdf", "QPDFWriter forcing object stream disable");
+	    this->object_stream_mode = o_disable;
+	}
+    }
+
     if (this->qdf_mode || this->normalize_content ||
 	(this->stream_data_mode == s_uncompress))
     {
-- 
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