Update safe numerics package to get bitwise ops

core/fpdfapi/page/fpdf_page_func.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/page/pageint.h"
 
 #include <limits.h>
 
@@ skipping 556 matching lines @@
 
   FX_SAFE_INT32 range_check = bitpos;
   range_check += bits_to_output.ValueOrDie();
   if (!range_check.IsValid())
     return false;
 
   const uint8_t* pSampleData = m_pSampleStream->GetData();
   if (!pSampleData)
     return false;
 
-  for (uint32_t j = 0; j < m_nOutputs; j++) {
+  for (uint32_t j = 0; j < m_nOutputs; j++, bitpos += m_nBitsPerSample) {
     uint32_t sample =
-        GetBits32(pSampleData, bitpos.ValueOrDie() + j * m_nBitsPerSample,
-                  m_nBitsPerSample);
+        GetBits32(pSampleData, bitpos.ValueOrDie(), m_nBitsPerSample);
     FX_FLOAT encoded = (FX_FLOAT)sample;
     for (uint32_t i = 0; i < m_nInputs; i++) {
       if (index[i] == m_EncodeInfo[i].sizes - 1) {
         if (index[i] == 0)
           encoded = encoded_input[i] * (FX_FLOAT)sample;
       } else {
         FX_SAFE_INT32 bitpos2 = blocksize[i];
         bitpos2 += pos;
         bitpos2 *= m_nOutputs;
         bitpos2 += j;
@@ skipping 260 matching lines @@
   return m_Type == Type::kType2ExpotentialInterpolation
              ? static_cast<const CPDF_ExpIntFunc*>(this)
              : nullptr;
 }
 
 const CPDF_StitchFunc* CPDF_Function::ToStitchFunc() const {
   return m_Type == Type::kType3Stitching
              ? static_cast<const CPDF_StitchFunc*>(this)
              : nullptr;
 }