content: /*
   * MIT License
   *
   * Copyright (c) 2018 Alibaba Group
   *
   * Permission is hereby granted, free of charge, to any person obtaining a copy
   * of this software and associated documentation files (the "Software"), to deal
   * in the Software without restriction, including without limitation the rights
   * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
   * copies of the Software, and to permit persons to whom the Software is
   * furnished to do so, subject to the following conditions:
   *
   * The above copyright notice and this permission notice shall be included in all
   * copies or substantial portions of the Software.
   *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
   * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
   * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
   * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
   * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
   * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
   * SOFTWARE.
   */
  
  package com.tmall.wireless.vaf.expr.engine;
  
  import android.util.Log;
  
  import com.libra.expr.common.ExprCode;
  
  public class CodeReader {
      private final static String TAG = "CodeReader";
  
      private ExprCode mCode;
      private int mCurIndex;
      private int mStartPos;
  //    private int mCount;
  
      public void setCode(ExprCode code) {
          mCode = code;
  
          mStartPos = mCode.mStartPos;
          mCurIndex = mStartPos;
      }
  
      public void release() {
  //        Log.d(TAG, "release");
  
          if (null != mCode) {
  //            mCode.clear();
              mCode = null;
          }
      }
  
      public int curPos() {
          return mCurIndex - mStartPos;
      }
  
      public void setPos(int pos) {
          mCurIndex = mStartPos + pos;
      }
  
      public boolean isEndOfCode() {
          return (mCurIndex == mCode.mEndPos) ? true : false;
      }
  
      public byte readByte() {
          byte ret = 0;
  
          if (null != mCode && mCurIndex < mCode.mEndPos) {
              ret = mCode.mCodeBase[mCurIndex++];
          } else {
              Log.e(TAG, "readByte error mCode:" + mCode + "  mCurIndex:"
                      + mCurIndex);
          }
  
          return ret;
      }
  
      public short readShort() {
          short ret = 0;
  
          if (null != mCode && mCurIndex < mCode.mEndPos - 1) {
              ret = (short) (mCode.mCodeBase[mCurIndex++] & 0xff);
              ret = (short) ((((short) mCode.mCodeBase[mCurIndex++]) << 8) | ret);
          } else {
              Log.e(TAG, "readShort error mCode:" + mCode + "  mCurIndex:"
                      + mCurIndex);
          }
  
          return ret;
      }
  
      public int readInt() {
          int ret = 0;
  
          if (null != mCode && mCurIndex < mCode.mEndPos - 3) {
              int move = 0;
              int step = 8;
              for (int i = 0; i < 4; ++i) {
                  int value = ((int) (mCode.mCodeBase[mCurIndex++] & 0xff)) << move;
                  ret |= value;
  
                  move += step;
              }
          } else {
              Log.e(TAG, "readInt error mCode:" + mCode + "  mCurIndex:"
                      + mCurIndex);
          }
  
          return ret;
      }
  }
  