fix for stream object reading

core/src/fpdfapi/fpdf_parser/fpdf_parser_parser.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 "parser_int.h"
 
 #include <set>
 #include <utility>
@@ skipping 2334 matching lines @@
     FX_BOOL bSearchForKeyword = TRUE;
     if (len >= 0) {
       pdfium::base::CheckedNumeric<FX_FILESIZE> pos = m_Pos;
       pos += len;
       if (pos.IsValid() && pos.ValueOrDie() < m_FileLen) {
         m_Pos = pos.ValueOrDie();
       }
       m_Pos += ReadEOLMarkers(m_Pos);
       FXSYS_memset(m_WordBuffer, 0, ENDSTREAM_LEN + 1);
       GetNextWord();
-      if (FXSYS_memcmp(m_WordBuffer, "endstream", ENDSTREAM_LEN) == 0 &&
-          IsWholeWord(m_Pos - ENDSTREAM_LEN, m_FileLen,
-                      FX_BSTRC("endstream").GetPtr(), ENDSTREAM_LEN, TRUE)) {
+      // Earlier version of PDF specification doesn't require EOL marker before
+      // 'endstream' keyword. If keyword 'endstream' follows the bytes in
+      // specified length, it signals the end of stream.
+      if (FXSYS_memcmp(m_WordBuffer, "endstream", ENDSTREAM_LEN) == 0)
         bSearchForKeyword = FALSE;
-      }
     }
     if (bSearchForKeyword) {
       // If len is not available, len needs to be calculated
       // by searching the keywords "endstream" or "endobj".
       m_Pos = streamStartPos;
       FX_FILESIZE endStreamOffset = 0;
       while (endStreamOffset >= 0) {
         endStreamOffset = FindTag(FX_BSTRC("endstream"), 0);
         if (endStreamOffset < 0) {
           // Can't find any "endstream".
@@ skipping 2571 matching lines @@
   if (!m_pLinearizedDict)
     return -1;
   CPDF_Array* pRange = m_pLinearizedDict->GetArray(FX_BSTRC("H"));
   if (!pRange)
     return -1;
   CPDF_Object* pStreamLen = pRange->GetElementValue(1);
   if (!pStreamLen)
     return -1;
   return pStreamLen->GetInteger();
 }