Reduce signed/unsigned comparison warnings

core/fpdfapi/fpdf_parser/cpdf_hint_tables.cpp

 // Copyright 2016 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/fpdf_parser/cpdf_hint_tables.h"
 
 #include "core/fpdfapi/fpdf_parser/cpdf_data_avail.h"
 #include "core/fpdfapi/fpdf_parser/include/cpdf_array.h"
@@ skipping 167 matching lines @@
     m_dwNSharedObjsArray.Add(hStream->GetBits(dwSharedObjBits));
   hStream->ByteAlign();
 
   // Array of identifiers, size = nshared_objects.
   for (int i = 0; i < nPages; i++) {
     required_bits = dwSharedIdBits;
     required_bits *= m_dwNSharedObjsArray[i];
     if (!CanReadFromBitStream(hStream, required_bits))
       return FALSE;
 
-    for (int j = 0; j < m_dwNSharedObjsArray[i]; j++)
+    for (uint32_t j = 0; j < m_dwNSharedObjsArray[i]; j++)
       m_dwIdentifierArray.Add(hStream->GetBits(dwSharedIdBits));
   }
   hStream->ByteAlign();
 
   for (int i = 0; i < nPages; i++) {
     FX_SAFE_DWORD safeSize = m_dwNSharedObjsArray[i];
     safeSize *= dwSharedNumeratorBits;
     if (!CanReadFromBitStream(hStream, safeSize))
       return FALSE;
 
@@ skipping 179 matching lines @@
   for (int i = 0; i < index; ++i)
     offset += m_dwNSharedObjsArray[i];
 
   CPDF_Object* pFirstPageObj = m_pLinearizedDict->GetElementValue("O");
   int nFirstPageObjNum = pFirstPageObj ? pFirstPageObj->GetInteger() : -1;
   if (nFirstPageObjNum < 0)
     return IPDF_DataAvail::DataError;
 
   uint32_t dwIndex = 0;
   uint32_t dwObjNum = 0;
-  for (int j = 0; j < m_dwNSharedObjsArray[index]; ++j) {
+  for (uint32_t j = 0; j < m_dwNSharedObjsArray[index]; ++j) {
     dwIndex = m_dwIdentifierArray[offset + j];
     if (dwIndex >= m_dwSharedObjNumArray.GetSize())
       return IPDF_DataAvail::DataNotAvailable;
 
     dwObjNum = m_dwSharedObjNumArray[dwIndex];
     if (dwObjNum >= nFirstPageObjNum &&
         dwObjNum < nFirstPageObjNum + m_nFirstPageSharedObjs) {
       continue;
     }
 
@@ skipping 62 matching lines @@
   CPDF_Array* pRange = m_pLinearizedDict->GetArrayBy("H");
   if (!pRange)
     return -1;
 
   CPDF_Object* pStreamLen = pRange->GetElementValue(1);
   if (!pStreamLen)
     return -1;
 
   return pStreamLen->GetInteger();
 }