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Diffstat (limited to 'libjava/java/util/zip/ZipFile.java')
| -rw-r--r-- | libjava/java/util/zip/ZipFile.java | 551 |
1 files changed, 0 insertions, 551 deletions
diff --git a/libjava/java/util/zip/ZipFile.java b/libjava/java/util/zip/ZipFile.java deleted file mode 100644 index 3fbff16c501..00000000000 --- a/libjava/java/util/zip/ZipFile.java +++ /dev/null @@ -1,551 +0,0 @@ -/* ZipFile.java -- - Copyright (C) 2001, 2002, 2003, 2004, 2005 Free Software Foundation, Inc. - -This file is part of GNU Classpath. - -GNU Classpath is free software; you can redistribute it and/or modify -it under the terms of the GNU General Public License as published by -the Free Software Foundation; either version 2, or (at your option) -any later version. - -GNU Classpath is distributed in the hope that it will be useful, but -WITHOUT ANY WARRANTY; without even the implied warranty of -MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU -General Public License for more details. - -You should have received a copy of the GNU General Public License -along with GNU Classpath; see the file COPYING. If not, write to the -Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA -02110-1301 USA. - -Linking this library statically or dynamically with other modules is -making a combined work based on this library. Thus, the terms and -conditions of the GNU General Public License cover the whole -combination. - -As a special exception, the copyright holders of this library give you -permission to link this library with independent modules to produce an -executable, regardless of the license terms of these independent -modules, and to copy and distribute the resulting executable under -terms of your choice, provided that you also meet, for each linked -independent module, the terms and conditions of the license of that -module. An independent module is a module which is not derived from -or based on this library. If you modify this library, you may extend -this exception to your version of the library, but you are not -obligated to do so. If you do not wish to do so, delete this -exception statement from your version. */ - - -package java.util.zip; - -import java.io.BufferedInputStream; -import java.io.DataInput; -import java.io.EOFException; -import java.io.File; -import java.io.IOException; -import java.io.InputStream; -import java.io.RandomAccessFile; -import java.util.Enumeration; -import java.util.HashMap; -import java.util.Iterator; - -/** - * This class represents a Zip archive. You can ask for the contained - * entries, or get an input stream for a file entry. The entry is - * automatically decompressed. - * - * This class is thread safe: You can open input streams for arbitrary - * entries in different threads. - * - * @author Jochen Hoenicke - * @author Artur Biesiadowski - */ -public class ZipFile implements ZipConstants -{ - - /** - * Mode flag to open a zip file for reading. - */ - public static final int OPEN_READ = 0x1; - - /** - * Mode flag to delete a zip file after reading. - */ - public static final int OPEN_DELETE = 0x4; - - // Name of this zip file. - private final String name; - - // File from which zip entries are read. - private final RandomAccessFile raf; - - // The entries of this zip file when initialized and not yet closed. - private HashMap entries; - - private boolean closed = false; - - /** - * Opens a Zip file with the given name for reading. - * @exception IOException if a i/o error occured. - * @exception ZipException if the file doesn't contain a valid zip - * archive. - */ - public ZipFile(String name) throws ZipException, IOException - { - this.raf = new RandomAccessFile(name, "r"); - this.name = name; - } - - /** - * Opens a Zip file reading the given File. - * @exception IOException if a i/o error occured. - * @exception ZipException if the file doesn't contain a valid zip - * archive. - */ - public ZipFile(File file) throws ZipException, IOException - { - this.raf = new RandomAccessFile(file, "r"); - this.name = file.getPath(); - } - - /** - * Opens a Zip file reading the given File in the given mode. - * - * If the OPEN_DELETE mode is specified, the zip file will be deleted at - * some time moment after it is opened. It will be deleted before the zip - * file is closed or the Virtual Machine exits. - * - * The contents of the zip file will be accessible until it is closed. - * - * @since JDK1.3 - * @param mode Must be one of OPEN_READ or OPEN_READ | OPEN_DELETE - * - * @exception IOException if a i/o error occured. - * @exception ZipException if the file doesn't contain a valid zip - * archive. - */ - public ZipFile(File file, int mode) throws ZipException, IOException - { - if (mode != OPEN_READ && mode != (OPEN_READ | OPEN_DELETE)) - throw new IllegalArgumentException("invalid mode"); - if ((mode & OPEN_DELETE) != 0) - file.deleteOnExit(); - this.raf = new RandomAccessFile(file, "r"); - this.name = file.getPath(); - } - - /** - * Read an unsigned short in little endian byte order from the given - * DataInput stream using the given byte buffer. - * - * @param di DataInput stream to read from. - * @param b the byte buffer to read in (must be at least 2 bytes long). - * @return The value read. - * - * @exception IOException if a i/o error occured. - * @exception EOFException if the file ends prematurely - */ - private int readLeShort(DataInput di, byte[] b) throws IOException - { - di.readFully(b, 0, 2); - return (b[0] & 0xff) | (b[1] & 0xff) << 8; - } - - /** - * Read an int in little endian byte order from the given - * DataInput stream using the given byte buffer. - * - * @param di DataInput stream to read from. - * @param b the byte buffer to read in (must be at least 4 bytes long). - * @return The value read. - * - * @exception IOException if a i/o error occured. - * @exception EOFException if the file ends prematurely - */ - private int readLeInt(DataInput di, byte[] b) throws IOException - { - di.readFully(b, 0, 4); - return ((b[0] & 0xff) | (b[1] & 0xff) << 8) - | ((b[2] & 0xff) | (b[3] & 0xff) << 8) << 16; - } - - /** - * Read an unsigned short in little endian byte order from the given - * byte buffer at the given offset. - * - * @param b the byte array to read from. - * @param off the offset to read from. - * @return The value read. - */ - private int readLeShort(byte[] b, int off) - { - return (b[off] & 0xff) | (b[off+1] & 0xff) << 8; - } - - /** - * Read an int in little endian byte order from the given - * byte buffer at the given offset. - * - * @param b the byte array to read from. - * @param off the offset to read from. - * @return The value read. - */ - private int readLeInt(byte[] b, int off) - { - return ((b[off] & 0xff) | (b[off+1] & 0xff) << 8) - | ((b[off+2] & 0xff) | (b[off+3] & 0xff) << 8) << 16; - } - - - /** - * Read the central directory of a zip file and fill the entries - * array. This is called exactly once when first needed. It is called - * while holding the lock on <code>raf</code>. - * - * @exception IOException if a i/o error occured. - * @exception ZipException if the central directory is malformed - */ - private void readEntries() throws ZipException, IOException - { - /* Search for the End Of Central Directory. When a zip comment is - * present the directory may start earlier. - * FIXME: This searches the whole file in a very slow manner if the - * file isn't a zip file. - */ - long pos = raf.length() - ENDHDR; - byte[] ebs = new byte[CENHDR]; - - do - { - if (pos < 0) - throw new ZipException - ("central directory not found, probably not a zip file: " + name); - raf.seek(pos--); - } - while (readLeInt(raf, ebs) != ENDSIG); - - if (raf.skipBytes(ENDTOT - ENDNRD) != ENDTOT - ENDNRD) - throw new EOFException(name); - int count = readLeShort(raf, ebs); - if (raf.skipBytes(ENDOFF - ENDSIZ) != ENDOFF - ENDSIZ) - throw new EOFException(name); - int centralOffset = readLeInt(raf, ebs); - - entries = new HashMap(count+count/2); - raf.seek(centralOffset); - - byte[] buffer = new byte[16]; - for (int i = 0; i < count; i++) - { - raf.readFully(ebs); - if (readLeInt(ebs, 0) != CENSIG) - throw new ZipException("Wrong Central Directory signature: " + name); - - int method = readLeShort(ebs, CENHOW); - int dostime = readLeInt(ebs, CENTIM); - int crc = readLeInt(ebs, CENCRC); - int csize = readLeInt(ebs, CENSIZ); - int size = readLeInt(ebs, CENLEN); - int nameLen = readLeShort(ebs, CENNAM); - int extraLen = readLeShort(ebs, CENEXT); - int commentLen = readLeShort(ebs, CENCOM); - - int offset = readLeInt(ebs, CENOFF); - - int needBuffer = Math.max(nameLen, commentLen); - if (buffer.length < needBuffer) - buffer = new byte[needBuffer]; - - raf.readFully(buffer, 0, nameLen); - String name = new String(buffer, 0, 0, nameLen); - - ZipEntry entry = new ZipEntry(name); - entry.setMethod(method); - entry.setCrc(crc & 0xffffffffL); - entry.setSize(size & 0xffffffffL); - entry.setCompressedSize(csize & 0xffffffffL); - entry.setDOSTime(dostime); - if (extraLen > 0) - { - byte[] extra = new byte[extraLen]; - raf.readFully(extra); - entry.setExtra(extra); - } - if (commentLen > 0) - { - raf.readFully(buffer, 0, commentLen); - entry.setComment(new String(buffer, 0, commentLen)); - } - entry.offset = offset; - entries.put(name, entry); - } - } - - /** - * Closes the ZipFile. This also closes all input streams given by - * this class. After this is called, no further method should be - * called. - * - * @exception IOException if a i/o error occured. - */ - public void close() throws IOException - { - synchronized (raf) - { - closed = true; - entries = null; - raf.close(); - } - } - - /** - * Calls the <code>close()</code> method when this ZipFile has not yet - * been explicitly closed. - */ - protected void finalize() throws IOException - { - if (!closed && raf != null) close(); - } - - /** - * Returns an enumeration of all Zip entries in this Zip file. - */ - public Enumeration entries() - { - try - { - return new ZipEntryEnumeration(getEntries().values().iterator()); - } - catch (IOException ioe) - { - return null; - } - } - - /** - * Checks that the ZipFile is still open and reads entries when necessary. - * - * @exception IllegalStateException when the ZipFile has already been closed. - * @exception IOEexception when the entries could not be read. - */ - private HashMap getEntries() throws IOException - { - synchronized(raf) - { - if (closed) - throw new IllegalStateException("ZipFile has closed: " + name); - - if (entries == null) - readEntries(); - - return entries; - } - } - - /** - * Searches for a zip entry in this archive with the given name. - * - * @param the name. May contain directory components separated by - * slashes ('/'). - * @return the zip entry, or null if no entry with that name exists. - */ - public ZipEntry getEntry(String name) - { - try - { - HashMap entries = getEntries(); - ZipEntry entry = (ZipEntry) entries.get(name); - return entry != null ? (ZipEntry) entry.clone() : null; - } - catch (IOException ioe) - { - return null; - } - } - - - //access should be protected by synchronized(raf) - private byte[] locBuf = new byte[LOCHDR]; - - /** - * Checks, if the local header of the entry at index i matches the - * central directory, and returns the offset to the data. - * - * @param entry to check. - * @return the start offset of the (compressed) data. - * - * @exception IOException if a i/o error occured. - * @exception ZipException if the local header doesn't match the - * central directory header - */ - private long checkLocalHeader(ZipEntry entry) throws IOException - { - synchronized (raf) - { - raf.seek(entry.offset); - raf.readFully(locBuf); - - if (readLeInt(locBuf, 0) != LOCSIG) - throw new ZipException("Wrong Local header signature: " + name); - - if (entry.getMethod() != readLeShort(locBuf, LOCHOW)) - throw new ZipException("Compression method mismatch: " + name); - - if (entry.getName().length() != readLeShort(locBuf, LOCNAM)) - throw new ZipException("file name length mismatch: " + name); - - int extraLen = entry.getName().length() + readLeShort(locBuf, LOCEXT); - return entry.offset + LOCHDR + extraLen; - } - } - - /** - * Creates an input stream reading the given zip entry as - * uncompressed data. Normally zip entry should be an entry - * returned by getEntry() or entries(). - * - * This implementation returns null if the requested entry does not - * exist. This decision is not obviously correct, however, it does - * appear to mirror Sun's implementation, and it is consistant with - * their javadoc. On the other hand, the old JCL book, 2nd Edition, - * claims that this should return a "non-null ZIP entry". We have - * chosen for now ignore the old book, as modern versions of Ant (an - * important application) depend on this behaviour. See discussion - * in this thread: - * http://gcc.gnu.org/ml/java-patches/2004-q2/msg00602.html - * - * @param entry the entry to create an InputStream for. - * @return the input stream, or null if the requested entry does not exist. - * - * @exception IOException if a i/o error occured. - * @exception ZipException if the Zip archive is malformed. - */ - public InputStream getInputStream(ZipEntry entry) throws IOException - { - HashMap entries = getEntries(); - String name = entry.getName(); - ZipEntry zipEntry = (ZipEntry) entries.get(name); - if (zipEntry == null) - return null; - - long start = checkLocalHeader(zipEntry); - int method = zipEntry.getMethod(); - InputStream is = new BufferedInputStream(new PartialInputStream - (raf, start, zipEntry.getCompressedSize())); - switch (method) - { - case ZipOutputStream.STORED: - return is; - case ZipOutputStream.DEFLATED: - return new InflaterInputStream(is, new Inflater(true)); - default: - throw new ZipException("Unknown compression method " + method); - } - } - - /** - * Returns the (path) name of this zip file. - */ - public String getName() - { - return name; - } - - /** - * Returns the number of entries in this zip file. - */ - public int size() - { - try - { - return getEntries().size(); - } - catch (IOException ioe) - { - return 0; - } - } - - private static class ZipEntryEnumeration implements Enumeration - { - private final Iterator elements; - - public ZipEntryEnumeration(Iterator elements) - { - this.elements = elements; - } - - public boolean hasMoreElements() - { - return elements.hasNext(); - } - - public Object nextElement() - { - /* We return a clone, just to be safe that the user doesn't - * change the entry. - */ - return ((ZipEntry)elements.next()).clone(); - } - } - - private static class PartialInputStream extends InputStream - { - private final RandomAccessFile raf; - long filepos, end; - - public PartialInputStream(RandomAccessFile raf, long start, long len) - { - this.raf = raf; - filepos = start; - end = start + len; - } - - public int available() - { - long amount = end - filepos; - if (amount > Integer.MAX_VALUE) - return Integer.MAX_VALUE; - return (int) amount; - } - - public int read() throws IOException - { - if (filepos == end) - return -1; - synchronized (raf) - { - raf.seek(filepos++); - return raf.read(); - } - } - - public int read(byte[] b, int off, int len) throws IOException - { - if (len > end - filepos) - { - len = (int) (end - filepos); - if (len == 0) - return -1; - } - synchronized (raf) - { - raf.seek(filepos); - int count = raf.read(b, off, len); - if (count > 0) - filepos += len; - return count; - } - } - - public long skip(long amount) - { - if (amount < 0) - throw new IllegalArgumentException(); - if (amount > end - filepos) - amount = end - filepos; - filepos += amount; - return amount; - } - } -} |