Fix all the code which has duplicate variable declarations

core/fpdfapi/fpdf_parser/fpdf_parser_decode.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/fpdf_parser/include/fpdf_parser_decode.h"
 
 #include <limits.h>
 #include <utility>
@@ skipping 429 matching lines @@
     }
     FX_WCHAR* dest_buf = result.GetBuffer(max_chars);
     const uint8_t* uni_str = src_data + 2;
     int dest_pos = 0;
     for (uint32_t i = 0; i < max_chars * 2; i += 2) {
       uint16_t unicode = bBE ? (uni_str[i] << 8 | uni_str[i + 1])
                              : (uni_str[i + 1] << 8 | uni_str[i]);
       if (unicode == 0x1b) {
         i += 2;
         while (i < max_chars * 2) {
-          uint16_t unicode = bBE ? (uni_str[i] << 8 | uni_str[i + 1])
-                                 : (uni_str[i + 1] << 8 | uni_str[i]);
+          uint16_t unicode2 = bBE ? (uni_str[i] << 8 | uni_str[i + 1])
+                                  : (uni_str[i + 1] << 8 | uni_str[i]);
           i += 2;
-          if (unicode == 0x1b) {
+          if (unicode2 == 0x1b)
             break;
-          }
         }
       } else {
         dest_buf[dest_pos++] = unicode;
       }
     }
     result.ReleaseBuffer(dest_pos);
   } else {
     FX_WCHAR* dest_buf = result.GetBuffer(src_len);
     for (uint32_t i = 0; i < src_len; i++)
       dest_buf[i] = PDFDocEncoding[src_data[i]];
@@ skipping 33 matching lines @@
     result.ReleaseBuffer(0);
     return result;
   }
 
   int encLen = len * 2 + 2;
 
   uint8_t* dest_buf2 = (uint8_t*)result.GetBuffer(encLen);
   dest_buf2[0] = 0xfe;
   dest_buf2[1] = 0xff;
   dest_buf2 += 2;
-  for (int i = 0; i < len; i++) {
+  for (int j = 0; j < len; j++) {
     *dest_buf2++ = pString[i] >> 8;
-    *dest_buf2++ = (uint8_t)pString[i];
+    *dest_buf2++ = (uint8_t)pString[j];
   }
   result.ReleaseBuffer(encLen);
   return result;
 }
 
 CFX_ByteString PDF_EncodeText(const CFX_WideString& str) {
   return PDF_EncodeText(str.c_str(), str.GetLength());
 }
 
 CFX_ByteString PDF_EncodeString(const CFX_ByteString& src, FX_BOOL bHex) {
@@ skipping 56 matching lines @@
                      uint32_t src_size,
                      uint8_t*& dest_buf,
                      uint32_t& dest_size) {
   CCodec_ModuleMgr* pEncoders = CPDF_ModuleMgr::Get()->GetCodecModule();
   if (pEncoders) {
     return pEncoders->GetFlateModule()->FlateOrLZWDecode(
         FALSE, src_buf, src_size, FALSE, 0, 0, 0, 0, 0, dest_buf, dest_size);
   }
   return 0;
 }