Fix garbled text when loading linearized pdf document

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 "../../../include/fpdfapi/fpdf_parser.h"
 #include "../../../include/fpdfapi/fpdf_module.h"
 #include "../../../include/fpdfapi/fpdf_page.h"
 #include "../../../../third_party/numerics/safe_math.h"
 #include "../fpdf_page/pageint.h"
 #include <limits.h>
 #define _PARSER_OBJECT_LEVLE_           64
 extern const FX_LPCSTR _PDF_CharType;
 FX_BOOL IsSignatureDict(const CPDF_Dictionary* pDict)
 {
     CPDF_Object* pType = pDict->GetElementValue(FX_BSTRC("Type"));
     if (!pType) {
         pType = pDict->GetElementValue(FX_BSTRC("FT"));
         if (!pType) {
             return FALSE;
         }
     }
     if (pType->GetString() == FX_BSTRC("Sig")) {
         return TRUE;
     }
     return FALSE;
 }
 static FX_INT32 _CompareDWord(const void* p1, const void* p2)

[Lei Zhang, 2014/07/17 23:16:15]

Now _CompareDword() is no longer used.

 {
     return (*(FX_DWORD*)p1) - (*(FX_DWORD*)p2);
 }
 static int _CompareFileSize(const void* p1, const void* p2)
 {
     FX_FILESIZE ret = (*(FX_FILESIZE*)p1) - (*(FX_FILESIZE*)p2);
     if (ret > 0) {
         return 1;
     }
     if (ret < 0) {
@@ skipping 1603 matching lines @@
         CPDF_StreamAcc* pStream;
         m_ObjectStreamMap.GetNextAssoc(pos, objnum, (void*&)pStream);
         delete pStream;
     }
     m_ObjectStreamMap.RemoveAll();
     if (!LoadLinearizedAllCrossRefV4(m_LastXRefOffset, m_dwXrefStartObjNum) && !LoadLinearizedAllCrossRefV5(m_LastXRefOffset)) {
         m_LastXRefOffset = 0;
         m_Syntax.m_MetadataObjnum = dwSaveMetadataObjnum;
         return PDFPARSE_ERROR_FORMAT;
     }
-    FXSYS_qsort(m_SortedOffset.GetData(), m_SortedOffset.GetSize(), sizeof(FX_DWORD), _CompareDWord);
+    FXSYS_qsort(m_SortedOffset.GetData(), m_SortedOffset.GetSize(), sizeof(FX_FILESIZE), _CompareFileSize);
     m_Syntax.m_MetadataObjnum = dwSaveMetadataObjnum;
     return PDFPARSE_ERROR_SUCCESS;
 }
 CPDF_SyntaxParser::CPDF_SyntaxParser()
 {
     m_pFileAccess = NULL;
     m_pCryptoHandler = NULL;
     m_pFileBuf = NULL;
     m_BufSize = CPDF_ModuleMgr::Get()->m_FileBufSize;
     m_pFileBuf = NULL;
@@ skipping 2720 matching lines @@
 {
     FX_INT32 iSize = m_childNode.GetSize();
     for (FX_INT32 i = 0; i < iSize; ++i) {
         CPDF_PageNode *pNode = (CPDF_PageNode*)m_childNode[i];
         if (pNode) {
             delete pNode;
         }
     }
     m_childNode.RemoveAll();
 }