001/* 002 * Licensed to the Apache Software Foundation (ASF) under one or more 003 * contributor license agreements. See the NOTICE file distributed with 004 * this work for additional information regarding copyright ownership. 005 * The ASF licenses this file to You under the Apache License, Version 2.0 006 * (the "License"); you may not use this file except in compliance with 007 * the License. You may obtain a copy of the License at 008 * 009 * http://www.apache.org/licenses/LICENSE-2.0 010 * 011 * Unless required by applicable law or agreed to in writing, software 012 * distributed under the License is distributed on an "AS IS" BASIS, 013 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 014 * See the License for the specific language governing permissions and 015 * limitations under the License. 016 */ 017package org.apache.commons.compress.harmony.unpack200; 018 019import java.io.IOException; 020import java.io.InputStream; 021 022import org.apache.commons.compress.harmony.pack200.Codec; 023import org.apache.commons.compress.harmony.pack200.Pack200Exception; 024 025/** 026 * Parses the file band headers (not including the actual bits themselves). At the end of this parse call, the input 027 * stream will be positioned at the start of the file_bits themselves, and there will be Sum(file_size) bits remaining 028 * in the stream with BYTE1 compression. A decent implementation will probably just stream the bytes out to the 029 * reconstituted Jar rather than caching them. 030 */ 031public class FileBands extends BandSet { 032 033 private byte[][] fileBits; 034 035 private int[] fileModtime; 036 037 private String[] fileName; 038 039 private int[] fileOptions; 040 041 private long[] fileSize; 042 043 private final String[] cpUTF8; 044 045 private InputStream in; 046 047 /** 048 * @param segment TODO 049 */ 050 public FileBands(final Segment segment) { 051 super(segment); 052 this.cpUTF8 = segment.getCpBands().getCpUTF8(); 053 } 054 055 /* 056 * (non-Javadoc) 057 * 058 * @see org.apache.commons.compress.harmony.unpack200.BandSet#unpack(java.io.InputStream) 059 */ 060 @Override 061 public void read(final InputStream in) throws IOException, Pack200Exception { 062 final int numberOfFiles = header.getNumberOfFiles(); 063 final SegmentOptions options = header.getOptions(); 064 065 fileName = parseReferences("file_name", in, Codec.UNSIGNED5, numberOfFiles, cpUTF8); 066 fileSize = parseFlags("file_size", in, numberOfFiles, Codec.UNSIGNED5, options.hasFileSizeHi()); 067 if (options.hasFileModtime()) { 068 fileModtime = decodeBandInt("file_modtime", in, Codec.DELTA5, numberOfFiles); 069 } else { 070 fileModtime = new int[numberOfFiles]; 071 } 072 if (options.hasFileOptions()) { 073 fileOptions = decodeBandInt("file_options", in, Codec.UNSIGNED5, numberOfFiles); 074 } else { 075 fileOptions = new int[numberOfFiles]; 076 } 077 this.in = in; // store for use by processFileBits(), which is called 078 // later 079 } 080 081 // TODO: stream the file bits directly somehow 082 public void processFileBits() throws IOException, Pack200Exception { 083 // now read in the bytes 084 final int numberOfFiles = header.getNumberOfFiles(); 085 fileBits = new byte[numberOfFiles][]; 086 for (int i = 0; i < numberOfFiles; i++) { 087 final int size = (int) fileSize[i]; 088 // TODO This breaks if file_size > 2^32. Probably an array is 089 // not the right choice, and we should just serialize it here? 090 fileBits[i] = new byte[size]; 091 final int read = in.read(fileBits[i]); 092 if (size != 0 && read < size) { 093 throw new Pack200Exception("Expected to read " + size + " bytes but read " + read); 094 } 095 } 096 } 097 098 @Override 099 public void unpack() { 100 101 } 102 103 public byte[][] getFileBits() { 104 return fileBits; 105 } 106 107 public int[] getFileModtime() { 108 return fileModtime; 109 } 110 111 public String[] getFileName() { 112 return fileName; 113 } 114 115 public int[] getFileOptions() { 116 return fileOptions; 117 } 118 119 public long[] getFileSize() { 120 return fileSize; 121 } 122 123}