+++ /dev/null
-/* ZipEntry.java --
- Copyright (C) 2001, 2002, 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.util.Calendar;
-import java.util.Date;
-
-/**
- * This class represents a member of a zip archive. ZipFile and
- * ZipInputStream will give you instances of this class as information
- * about the members in an archive. On the other hand ZipOutputStream
- * needs an instance of this class to create a new member.
- *
- * @author Jochen Hoenicke
- */
-public class ZipEntry implements ZipConstants, Cloneable
-{
- private static final int KNOWN_SIZE = 1;
- private static final int KNOWN_CSIZE = 2;
- private static final int KNOWN_CRC = 4;
- private static final int KNOWN_TIME = 8;
-
- private static Calendar cal;
-
- private String name;
- private int size;
- private long compressedSize = -1;
- private int crc;
- private int dostime;
- private short known = 0;
- private short method = -1;
- private byte[] extra = null;
- private String comment = null;
-
- int flags; /* used by ZipOutputStream */
- int offset; /* used by ZipFile and ZipOutputStream */
-
- /**
- * Compression method. This method doesn't compress at all.
- */
- public static final int STORED = 0;
- /**
- * Compression method. This method uses the Deflater.
- */
- public static final int DEFLATED = 8;
-
- /**
- * Creates a zip entry with the given name.
- * @param name the name. May include directory components separated
- * by '/'.
- *
- * @exception NullPointerException when name is null.
- * @exception IllegalArgumentException when name is bigger then 65535 chars.
- */
- public ZipEntry(String name)
- {
- int length = name.length();
- if (length > 65535)
- throw new IllegalArgumentException("name length is " + length);
- this.name = name;
- }
-
- /**
- * Creates a copy of the given zip entry.
- * @param e the entry to copy.
- */
- public ZipEntry(ZipEntry e)
- {
- name = e.name;
- known = e.known;
- size = e.size;
- compressedSize = e.compressedSize;
- crc = e.crc;
- dostime = e.dostime;
- method = e.method;
- extra = e.extra;
- comment = e.comment;
- }
-
- final void setDOSTime(int dostime)
- {
- this.dostime = dostime;
- known |= KNOWN_TIME;
- }
-
- final int getDOSTime()
- {
- if ((known & KNOWN_TIME) == 0)
- return 0;
- else
- return dostime;
- }
-
- /**
- * Creates a copy of this zip entry.
- */
- /**
- * Clones the entry.
- */
- public Object clone()
- {
- try
- {
- // The JCL says that the `extra' field is also copied.
- ZipEntry clone = (ZipEntry) super.clone();
- if (extra != null)
- clone.extra = (byte[]) extra.clone();
- return clone;
- }
- catch (CloneNotSupportedException ex)
- {
- throw new InternalError();
- }
- }
-
- /**
- * Returns the entry name. The path components in the entry are
- * always separated by slashes ('/').
- */
- public String getName()
- {
- return name;
- }
-
- /**
- * Sets the time of last modification of the entry.
- * @time the time of last modification of the entry.
- */
- public void setTime(long time)
- {
- Calendar cal = getCalendar();
- synchronized (cal)
- {
- cal.setTime(new Date(time));
- dostime = (cal.get(Calendar.YEAR) - 1980 & 0x7f) << 25
- | (cal.get(Calendar.MONTH) + 1) << 21
- | (cal.get(Calendar.DAY_OF_MONTH)) << 16
- | (cal.get(Calendar.HOUR_OF_DAY)) << 11
- | (cal.get(Calendar.MINUTE)) << 5
- | (cal.get(Calendar.SECOND)) >> 1;
- }
- this.known |= KNOWN_TIME;
- }
-
- /**
- * Gets the time of last modification of the entry.
- * @return the time of last modification of the entry, or -1 if unknown.
- */
- public long getTime()
- {
- if ((known & KNOWN_TIME) == 0)
- return -1;
-
- int sec = 2 * (dostime & 0x1f);
- int min = (dostime >> 5) & 0x3f;
- int hrs = (dostime >> 11) & 0x1f;
- int day = (dostime >> 16) & 0x1f;
- int mon = ((dostime >> 21) & 0xf) - 1;
- int year = ((dostime >> 25) & 0x7f) + 1980; /* since 1900 */
-
- try
- {
- cal = getCalendar();
- synchronized (cal)
- {
- cal.set(year, mon, day, hrs, min, sec);
- return cal.getTime().getTime();
- }
- }
- catch (RuntimeException ex)
- {
- /* Ignore illegal time stamp */
- known &= ~KNOWN_TIME;
- return -1;
- }
- }
-
- private static synchronized Calendar getCalendar()
- {
- if (cal == null)
- cal = Calendar.getInstance();
-
- return cal;
- }
-
- /**
- * Sets the size of the uncompressed data.
- * @exception IllegalArgumentException if size is not in 0..0xffffffffL
- */
- public void setSize(long size)
- {
- if ((size & 0xffffffff00000000L) != 0)
- throw new IllegalArgumentException();
- this.size = (int) size;
- this.known |= KNOWN_SIZE;
- }
-
- /**
- * Gets the size of the uncompressed data.
- * @return the size or -1 if unknown.
- */
- public long getSize()
- {
- return (known & KNOWN_SIZE) != 0 ? size & 0xffffffffL : -1L;
- }
-
- /**
- * Sets the size of the compressed data.
- */
- public void setCompressedSize(long csize)
- {
- this.compressedSize = csize;
- }
-
- /**
- * Gets the size of the compressed data.
- * @return the size or -1 if unknown.
- */
- public long getCompressedSize()
- {
- return compressedSize;
- }
-
- /**
- * Sets the crc of the uncompressed data.
- * @exception IllegalArgumentException if crc is not in 0..0xffffffffL
- */
- public void setCrc(long crc)
- {
- if ((crc & 0xffffffff00000000L) != 0)
- throw new IllegalArgumentException();
- this.crc = (int) crc;
- this.known |= KNOWN_CRC;
- }
-
- /**
- * Gets the crc of the uncompressed data.
- * @return the crc or -1 if unknown.
- */
- public long getCrc()
- {
- return (known & KNOWN_CRC) != 0 ? crc & 0xffffffffL : -1L;
- }
-
- /**
- * Sets the compression method. Only DEFLATED and STORED are
- * supported.
- * @exception IllegalArgumentException if method is not supported.
- * @see ZipOutputStream#DEFLATED
- * @see ZipOutputStream#STORED
- */
- public void setMethod(int method)
- {
- if (method != ZipOutputStream.STORED
- && method != ZipOutputStream.DEFLATED)
- throw new IllegalArgumentException();
- this.method = (short) method;
- }
-
- /**
- * Gets the compression method.
- * @return the compression method or -1 if unknown.
- */
- public int getMethod()
- {
- return method;
- }
-
- /**
- * Sets the extra data.
- * @exception IllegalArgumentException if extra is longer than 0xffff bytes.
- */
- public void setExtra(byte[] extra)
- {
- if (extra == null)
- {
- this.extra = null;
- return;
- }
-
- if (extra.length > 0xffff)
- throw new IllegalArgumentException();
- this.extra = extra;
- try
- {
- int pos = 0;
- while (pos < extra.length)
- {
- int sig = (extra[pos++] & 0xff)
- | (extra[pos++] & 0xff) << 8;
- int len = (extra[pos++] & 0xff)
- | (extra[pos++] & 0xff) << 8;
- if (sig == 0x5455)
- {
- /* extended time stamp */
- int flags = extra[pos];
- if ((flags & 1) != 0)
- {
- long time = ((extra[pos+1] & 0xff)
- | (extra[pos+2] & 0xff) << 8
- | (extra[pos+3] & 0xff) << 16
- | (extra[pos+4] & 0xff) << 24);
- setTime(time);
- }
- }
- pos += len;
- }
- }
- catch (ArrayIndexOutOfBoundsException ex)
- {
- /* be lenient */
- return;
- }
- }
-
- /**
- * Gets the extra data.
- * @return the extra data or null if not set.
- */
- public byte[] getExtra()
- {
- return extra;
- }
-
- /**
- * Sets the entry comment.
- * @exception IllegalArgumentException if comment is longer than 0xffff.
- */
- public void setComment(String comment)
- {
- if (comment != null && comment.length() > 0xffff)
- throw new IllegalArgumentException();
- this.comment = comment;
- }
-
- /**
- * Gets the comment.
- * @return the comment or null if not set.
- */
- public String getComment()
- {
- return comment;
- }
-
- /**
- * Gets true, if the entry is a directory. This is solely
- * determined by the name, a trailing slash '/' marks a directory.
- */
- public boolean isDirectory()
- {
- int nlen = name.length();
- return nlen > 0 && name.charAt(nlen - 1) == '/';
- }
-
- /**
- * Gets the string representation of this ZipEntry. This is just
- * the name as returned by getName().
- */
- public String toString()
- {
- return name;
- }
-
- /**
- * Gets the hashCode of this ZipEntry. This is just the hashCode
- * of the name. Note that the equals method isn't changed, though.
- */
- public int hashCode()
- {
- return name.hashCode();
- }
-}
+++ /dev/null
-/* 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;
- }
- }
-}
projects / thirdparty / gcc.git / commitdiff
