| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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. |
| * |
| */ |
| |
| /* |
| * This package is based on the work done by Timothy Gerard Endres |
| * (time@ice.com) to whom the Ant project is very grateful for his great code. |
| */ |
| |
| package org.apache.tools.tar; |
| |
| import java.io.FilterInputStream; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.io.OutputStream; |
| |
| /** |
| * The TarInputStream reads a UNIX tar archive as an InputStream. |
| * methods are provided to position at each successive entry in |
| * the archive, and the read each entry as a normal input stream |
| * using read(). |
| * |
| */ |
| public class TarInputStream extends FilterInputStream { |
| private static final int SMALL_BUFFER_SIZE = 256; |
| private static final int BUFFER_SIZE = 8 * 1024; |
| private static final int LARGE_BUFFER_SIZE = 32 * 1024; |
| private static final int BYTE_MASK = 0xFF; |
| |
| // CheckStyle:VisibilityModifier OFF - bc |
| protected boolean debug; |
| protected boolean hasHitEOF; |
| protected long entrySize; |
| protected long entryOffset; |
| protected byte[] readBuf; |
| protected TarBuffer buffer; |
| protected TarEntry currEntry; |
| |
| /** |
| * This contents of this array is not used at all in this class, |
| * it is only here to avoid repreated object creation during calls |
| * to the no-arg read method. |
| */ |
| protected byte[] oneBuf; |
| |
| // CheckStyle:VisibilityModifier ON |
| |
| /** |
| * Constructor for TarInputStream. |
| * @param is the input stream to use |
| */ |
| public TarInputStream(InputStream is) { |
| this(is, TarBuffer.DEFAULT_BLKSIZE, TarBuffer.DEFAULT_RCDSIZE); |
| } |
| |
| /** |
| * Constructor for TarInputStream. |
| * @param is the input stream to use |
| * @param blockSize the block size to use |
| */ |
| public TarInputStream(InputStream is, int blockSize) { |
| this(is, blockSize, TarBuffer.DEFAULT_RCDSIZE); |
| } |
| |
| /** |
| * Constructor for TarInputStream. |
| * @param is the input stream to use |
| * @param blockSize the block size to use |
| * @param recordSize the record size to use |
| */ |
| public TarInputStream(InputStream is, int blockSize, int recordSize) { |
| super(is); |
| |
| this.buffer = new TarBuffer(is, blockSize, recordSize); |
| this.readBuf = null; |
| this.oneBuf = new byte[1]; |
| this.debug = false; |
| this.hasHitEOF = false; |
| } |
| |
| /** |
| * Sets the debugging flag. |
| * |
| * @param debug True to turn on debugging. |
| */ |
| public void setDebug(boolean debug) { |
| this.debug = debug; |
| this.buffer.setDebug(debug); |
| } |
| |
| /** |
| * Closes this stream. Calls the TarBuffer's close() method. |
| * @throws IOException on error |
| */ |
| public void close() throws IOException { |
| this.buffer.close(); |
| } |
| |
| /** |
| * Get the record size being used by this stream's TarBuffer. |
| * |
| * @return The TarBuffer record size. |
| */ |
| public int getRecordSize() { |
| return this.buffer.getRecordSize(); |
| } |
| |
| /** |
| * Get the available data that can be read from the current |
| * entry in the archive. This does not indicate how much data |
| * is left in the entire archive, only in the current entry. |
| * This value is determined from the entry's size header field |
| * and the amount of data already read from the current entry. |
| * Integer.MAX_VALUE is returen in case more than Integer.MAX_VALUE |
| * bytes are left in the current entry in the archive. |
| * |
| * @return The number of available bytes for the current entry. |
| * @throws IOException for signature |
| */ |
| public int available() throws IOException { |
| if (this.entrySize - this.entryOffset > Integer.MAX_VALUE) { |
| return Integer.MAX_VALUE; |
| } |
| return (int) (this.entrySize - this.entryOffset); |
| } |
| |
| /** |
| * Skip bytes in the input buffer. This skips bytes in the |
| * current entry's data, not the entire archive, and will |
| * stop at the end of the current entry's data if the number |
| * to skip extends beyond that point. |
| * |
| * @param numToSkip The number of bytes to skip. |
| * @return the number actually skipped |
| * @throws IOException on error |
| */ |
| public long skip(long numToSkip) throws IOException { |
| // REVIEW |
| // This is horribly inefficient, but it ensures that we |
| // properly skip over bytes via the TarBuffer... |
| // |
| byte[] skipBuf = new byte[BUFFER_SIZE]; |
| long skip = numToSkip; |
| while (skip > 0) { |
| int realSkip = (int) (skip > skipBuf.length ? skipBuf.length : skip); |
| int numRead = this.read(skipBuf, 0, realSkip); |
| if (numRead == -1) { |
| break; |
| } |
| skip -= numRead; |
| } |
| return (numToSkip - skip); |
| } |
| |
| /** |
| * Since we do not support marking just yet, we return false. |
| * |
| * @return False. |
| */ |
| public boolean markSupported() { |
| return false; |
| } |
| |
| /** |
| * Since we do not support marking just yet, we do nothing. |
| * |
| * @param markLimit The limit to mark. |
| */ |
| public void mark(int markLimit) { |
| } |
| |
| /** |
| * Since we do not support marking just yet, we do nothing. |
| */ |
| public void reset() { |
| } |
| |
| /** |
| * Get the next entry in this tar archive. This will skip |
| * over any remaining data in the current entry, if there |
| * is one, and place the input stream at the header of the |
| * next entry, and read the header and instantiate a new |
| * TarEntry from the header bytes and return that entry. |
| * If there are no more entries in the archive, null will |
| * be returned to indicate that the end of the archive has |
| * been reached. |
| * |
| * @return The next TarEntry in the archive, or null. |
| * @throws IOException on error |
| */ |
| public TarEntry getNextEntry() throws IOException { |
| if (this.hasHitEOF) { |
| return null; |
| } |
| |
| if (this.currEntry != null) { |
| long numToSkip = this.entrySize - this.entryOffset; |
| |
| if (this.debug) { |
| System.err.println("TarInputStream: SKIP currENTRY '" |
| + this.currEntry.getName() + "' SZ " |
| + this.entrySize + " OFF " |
| + this.entryOffset + " skipping " |
| + numToSkip + " bytes"); |
| } |
| |
| if (numToSkip > 0) { |
| this.skip(numToSkip); |
| } |
| |
| this.readBuf = null; |
| } |
| |
| byte[] headerBuf = this.buffer.readRecord(); |
| |
| if (headerBuf == null) { |
| if (this.debug) { |
| System.err.println("READ NULL RECORD"); |
| } |
| this.hasHitEOF = true; |
| } else if (this.buffer.isEOFRecord(headerBuf)) { |
| if (this.debug) { |
| System.err.println("READ EOF RECORD"); |
| } |
| this.hasHitEOF = true; |
| } |
| |
| if (this.hasHitEOF) { |
| this.currEntry = null; |
| } else { |
| this.currEntry = new TarEntry(headerBuf); |
| |
| if (this.debug) { |
| System.err.println("TarInputStream: SET CURRENTRY '" |
| + this.currEntry.getName() |
| + "' size = " |
| + this.currEntry.getSize()); |
| } |
| |
| this.entryOffset = 0; |
| |
| this.entrySize = this.currEntry.getSize(); |
| } |
| |
| if (this.currEntry != null && this.currEntry.isGNULongNameEntry()) { |
| // read in the name |
| StringBuffer longName = new StringBuffer(); |
| byte[] buf = new byte[SMALL_BUFFER_SIZE]; |
| int length = 0; |
| while ((length = read(buf)) >= 0) { |
| longName.append(new String(buf, 0, length)); |
| } |
| getNextEntry(); |
| if (this.currEntry == null) { |
| // Bugzilla: 40334 |
| // Malformed tar file - long entry name not followed by entry |
| return null; |
| } |
| // remove trailing null terminator |
| if (longName.length() > 0 |
| && longName.charAt(longName.length() - 1) == 0) { |
| longName.deleteCharAt(longName.length() - 1); |
| } |
| this.currEntry.setName(longName.toString()); |
| } |
| |
| return this.currEntry; |
| } |
| |
| /** |
| * Reads a byte from the current tar archive entry. |
| * |
| * This method simply calls read( byte[], int, int ). |
| * |
| * @return The byte read, or -1 at EOF. |
| * @throws IOException on error |
| */ |
| public int read() throws IOException { |
| int num = this.read(this.oneBuf, 0, 1); |
| return num == -1 ? -1 : ((int) this.oneBuf[0]) & BYTE_MASK; |
| } |
| |
| /** |
| * Reads bytes from the current tar archive entry. |
| * |
| * This method is aware of the boundaries of the current |
| * entry in the archive and will deal with them as if they |
| * were this stream's start and EOF. |
| * |
| * @param buf The buffer into which to place bytes read. |
| * @param offset The offset at which to place bytes read. |
| * @param numToRead The number of bytes to read. |
| * @return The number of bytes read, or -1 at EOF. |
| * @throws IOException on error |
| */ |
| public int read(byte[] buf, int offset, int numToRead) throws IOException { |
| int totalRead = 0; |
| |
| if (this.entryOffset >= this.entrySize) { |
| return -1; |
| } |
| |
| if ((numToRead + this.entryOffset) > this.entrySize) { |
| numToRead = (int) (this.entrySize - this.entryOffset); |
| } |
| |
| if (this.readBuf != null) { |
| int sz = (numToRead > this.readBuf.length) ? this.readBuf.length |
| : numToRead; |
| |
| System.arraycopy(this.readBuf, 0, buf, offset, sz); |
| |
| if (sz >= this.readBuf.length) { |
| this.readBuf = null; |
| } else { |
| int newLen = this.readBuf.length - sz; |
| byte[] newBuf = new byte[newLen]; |
| |
| System.arraycopy(this.readBuf, sz, newBuf, 0, newLen); |
| |
| this.readBuf = newBuf; |
| } |
| |
| totalRead += sz; |
| numToRead -= sz; |
| offset += sz; |
| } |
| |
| while (numToRead > 0) { |
| byte[] rec = this.buffer.readRecord(); |
| |
| if (rec == null) { |
| // Unexpected EOF! |
| throw new IOException("unexpected EOF with " + numToRead |
| + " bytes unread"); |
| } |
| |
| int sz = numToRead; |
| int recLen = rec.length; |
| |
| if (recLen > sz) { |
| System.arraycopy(rec, 0, buf, offset, sz); |
| |
| this.readBuf = new byte[recLen - sz]; |
| |
| System.arraycopy(rec, sz, this.readBuf, 0, recLen - sz); |
| } else { |
| sz = recLen; |
| |
| System.arraycopy(rec, 0, buf, offset, recLen); |
| } |
| |
| totalRead += sz; |
| numToRead -= sz; |
| offset += sz; |
| } |
| |
| this.entryOffset += totalRead; |
| |
| return totalRead; |
| } |
| |
| /** |
| * Copies the contents of the current tar archive entry directly into |
| * an output stream. |
| * |
| * @param out The OutputStream into which to write the entry's data. |
| * @throws IOException on error |
| */ |
| public void copyEntryContents(OutputStream out) throws IOException { |
| byte[] buf = new byte[LARGE_BUFFER_SIZE]; |
| |
| while (true) { |
| int numRead = this.read(buf, 0, buf.length); |
| |
| if (numRead == -1) { |
| break; |
| } |
| |
| out.write(buf, 0, numRead); |
| } |
| } |
| } |