Prepare to convert various types to size_t.

webrtc/modules/audio_coding/codecs/ilbc/cb_search.c

 /*
  *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 209 matching lines @@
         cDot, range, stage, inverseEnergy,
         inverseEnergyShifts, Crit,
         &indexNew, &CritNew, &CritNewSh);
 
     /* Update the global best index and the corresponding gain */
     WebRtcIlbcfix_CbUpdateBestIndex(
         CritNew, CritNewSh, (int16_t)(indexNew+indexOffset), cDot[indexNew+indexOffset],
         inverseEnergy[indexNew+indexOffset], inverseEnergyShifts[indexNew+indexOffset],
         &CritMax, &shTotMax, &bestIndex, &bestGain);
 
-    sInd=bestIndex-(int16_t)(CB_RESRANGE>>1);
+    sInd = ((CB_RESRANGE >> 1) > bestIndex) ?
+        0 : (bestIndex - (CB_RESRANGE >> 1));
     eInd=sInd+CB_RESRANGE;
-    if (sInd<0) {
-      eInd-=sInd;
-      sInd=0;
-    }
     if (eInd>=range) {
       eInd=range-1;
       sInd=eInd-CB_RESRANGE;
     }
 
     range = WebRtcIlbcfix_kSearchRange[block][stage];
 
     if (lTarget==SUBL) {
       i=sInd;
       if (sInd<20) {
         WebRtcIlbcfix_AugmentedCbCorr(target, cbvectors+lMem,
                                       interpSamplesFilt, cDot,
                                       (int16_t)(sInd+20), (int16_t)(WEBRTC_SPL_MIN(39, (eInd+20))), scale);
         i=20;
+        cDotPtr = &cDot[20 - sInd];
+      } else {
+        cDotPtr = cDot;
       }
 
-      cDotPtr=&cDot[WEBRTC_SPL_MAX(0,(20-sInd))];
       cb_vecPtr = cbvectors+lMem-20-i;
 
       /* Calculate the cross correlations (main part of the filtered CB) */
       WebRtcSpl_CrossCorrelation(cDotPtr, target, cb_vecPtr, lTarget, (int16_t)(eInd-i+1), scale, -1);
 
     } else {
       cDotPtr = cDot;
       cb_vecPtr = cbvectors+lMem-lTarget-sInd;
 
       /* Calculate the cross correlations (main part of the filtered CB) */
@@ skipping 126 matching lines @@
         j=i;
         WebRtcIlbcfix_kGainSq5_ptr = (int16_t*)&WebRtcIlbcfix_kGainSq5[i];
       }
     }
     gainPtr++;
   }
   gain_index[0]=j;
 
   return;
 }