1 /* 2 * Copyright (C) 2011 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.dx.io.instructions; 18 19 import java.io.EOFException; 20 21 /** 22 * Implementation of {@code CodeInput} that reads from a {@code short[]}. 23 */ 24 public final class ShortArrayCodeInput extends BaseCodeCursor 25 implements CodeInput { 26 /** source array to read from */ 27 private final short[] array; 28 29 /** 30 * Constructs an instance. 31 */ ShortArrayCodeInput(short[] array)32 public ShortArrayCodeInput(short[] array) { 33 if (array == null) { 34 throw new NullPointerException("array == null"); 35 } 36 37 this.array = array; 38 } 39 40 /** @inheritDoc */ hasMore()41 public boolean hasMore() { 42 return cursor() < array.length; 43 } 44 45 /** @inheritDoc */ read()46 public int read() throws EOFException { 47 try { 48 int value = array[cursor()]; 49 advance(1); 50 return value & 0xffff; 51 } catch (ArrayIndexOutOfBoundsException ex) { 52 throw new EOFException(); 53 } 54 } 55 56 /** @inheritDoc */ readInt()57 public int readInt() throws EOFException { 58 int short0 = read(); 59 int short1 = read(); 60 61 return short0 | (short1 << 16); 62 } 63 64 /** @inheritDoc */ readLong()65 public long readLong() throws EOFException { 66 long short0 = read(); 67 long short1 = read(); 68 long short2 = read(); 69 long short3 = read(); 70 71 return short0 | (short1 << 16) | (short2 << 32) | (short3 << 48); 72 } 73 } 74