Remove unused code.

xfa/fxbarcode/common/BC_CommonBitSource.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
-// Original code is licensed as follows:
-/*
- * Copyright 2007 ZXing authors
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- *      http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-#include "xfa/fxbarcode/common/BC_CommonBitSource.h"
-
-CBC_CommonBitSource::CBC_CommonBitSource(CFX_ByteArray* bytes) {
-  m_bytes.Copy((*bytes));
-  m_bitOffset = 0;
-  m_byteOffset = 0;
-}
-CBC_CommonBitSource::~CBC_CommonBitSource() {}
-int32_t CBC_CommonBitSource::ReadBits(int32_t numBits, int32_t& e) {
-  if (numBits < 1 || numBits > 32) {
-    e = BCExceptionIllegalArgument;
-    return 0;
-  }
-  int32_t result = 0;
-  if (m_bitOffset > 0) {
-    int32_t bitsLeft = 8 - m_bitOffset;
-    int32_t toRead = numBits < bitsLeft ? numBits : bitsLeft;
-    int32_t bitsToNotRead = bitsLeft - toRead;
-    int32_t mask = (0xff >> (8 - toRead)) << bitsToNotRead;
-    result = (m_bytes[m_byteOffset] & mask) >> bitsToNotRead;
-    numBits -= toRead;
-    m_bitOffset += toRead;
-    if (m_bitOffset == 8) {
-      m_bitOffset = 0;
-      m_byteOffset++;
-    }
-  }
-  if (numBits > 0) {
-    while (numBits >= 8) {
-      result = (result << 8) | (m_bytes[m_byteOffset] & 0xff);
-      m_byteOffset++;
-      numBits -= 8;
-    }
-    if (numBits > 0) {
-      int32_t bitsToNotRead = 8 - numBits;
-      int32_t mask = (0xff >> bitsToNotRead) << bitsToNotRead;
-      result = (result << numBits) |
-               ((m_bytes[m_byteOffset] & mask) >> bitsToNotRead);
-      m_bitOffset += numBits;
-    }
-  }
-  return result;
-}
-int32_t CBC_CommonBitSource::Available() {
-  return 8 * (m_bytes.GetSize() - m_byteOffset) - m_bitOffset;
-}
-int32_t CBC_CommonBitSource::getByteOffset() {
-  return m_byteOffset;
-}