Add unit test for CXFA_FileRead.

core/fpdfapi/edit/fpdf_edit_create.cpp

 // Copyright 2014 PDFium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Original code copyright 2014 Foxit Software Inc. http://www.foxitsoftware.com
 
 #include "core/fpdfapi/edit/editint.h"
 
 #include <vector>
 
@@ skipping 399 matching lines @@
   }
 }
 
 CPDF_FlateEncoder::CPDF_FlateEncoder(CPDF_Stream* pStream, bool bFlateEncode)
     : m_pData(nullptr),
       m_dwSize(0),
       m_pDict(nullptr),
       m_bCloned(false),
       m_bNewData(false) {
   m_Acc.LoadAllData(pStream, true);
-  if ((pStream && pStream->GetDict() &&
-       pStream->GetDict()->KeyExist("Filter")) ||
-      !bFlateEncode) {
-    if (pStream->GetDict()->KeyExist("Filter") && !bFlateEncode) {
-      CPDF_StreamAcc destAcc;
-      destAcc.LoadAllData(pStream);
-      m_dwSize = destAcc.GetSize();
-      m_pData = (uint8_t*)destAcc.DetachData();
-      m_pDict = ToDictionary(pStream->GetDict()->Clone().release());
-      m_pDict->RemoveFor("Filter");
-      m_bNewData = true;
-      m_bCloned = true;
-    } else {
-      m_pData = (uint8_t*)m_Acc.GetData();
-      m_dwSize = m_Acc.GetSize();
-      m_pDict = pStream->GetDict();
-    }
+  bool bHasFilter = pStream && pStream->HasFilter();
+  if (bHasFilter && !bFlateEncode) {
+    CPDF_StreamAcc destAcc;
+    destAcc.LoadAllData(pStream);
+    m_dwSize = destAcc.GetSize();
+    m_pData = (uint8_t*)destAcc.DetachData();
+    m_pDict = ToDictionary(pStream->GetDict()->Clone().release());
+    m_pDict->RemoveFor("Filter");
+    m_bNewData = true;
+    m_bCloned = true;
     return;
   }
-
+  if (bHasFilter || !bFlateEncode) {
+    m_pData = (uint8_t*)m_Acc.GetData();
+    m_dwSize = m_Acc.GetSize();
+    m_pDict = pStream->GetDict();
+    return;
+  }
   m_bNewData = true;
   m_bCloned = true;
   // TODO(thestig): Move to Init() and check return value.
   ::FlateEncode(m_Acc.GetData(), m_Acc.GetSize(), &m_pData, &m_dwSize);
   m_pDict = ToDictionary(pStream->GetDict()->Clone().release());
   m_pDict->SetIntegerFor("Length", m_dwSize);
   m_pDict->SetNameFor("Filter", "FlateDecode");
   m_pDict->RemoveFor("DecodeParms");
 }
 
@@ skipping 1561 matching lines @@
   m_pCryptoHandler = nullptr;
 }
 void CPDF_Creator::ResetStandardSecurity() {
   if (!m_bLocalCryptoHandler)
     return;
 
   delete m_pCryptoHandler;
   m_pCryptoHandler = nullptr;
   m_bLocalCryptoHandler = false;
 }