Commit 6d0c7d7b by Michael Koch Committed by Michael Koch

Deflater.java, [...]: Reformated and javadoc comments merged from classpath.

2004-02-05  Michael Koch  <konqueror@gmx.de>

	* java/util/zip/Deflater.java,
	java/util/zip/DeflaterOutputStream.java,
	java/util/zip/GZIPInputStream.java:
	Reformated and javadoc comments merged from classpath.

From-SVN: r77319
parent 99814868
2004-02-05 Michael Koch <konqueror@gmx.de> 2004-02-05 Michael Koch <konqueror@gmx.de>
* java/util/zip/Deflater.java,
java/util/zip/DeflaterOutputStream.java,
java/util/zip/GZIPInputStream.java:
Reformated and javadoc comments merged from classpath.
2004-02-05 Michael Koch <konqueror@gmx.de>
* gnu/java/nio/NIOServerSocket.java * gnu/java/nio/NIOServerSocket.java
(impl): Unused, removed. (impl): Unused, removed.
* gnu/java/nio/SocketChannelImpl.java * gnu/java/nio/SocketChannelImpl.java
......
/* DeflaterOutputStream.java - Output filter for compressing. /* DeflaterOutputStream.java - Output filter for compressing.
Copyright (C) 1999, 2000 Free Software Foundation, Inc. Copyright (C) 1999, 2000, 2001, 2004 Free Software Foundation, Inc.
This file is part of GNU Classpath. This file is part of GNU Classpath.
......
/* GZIPInputStream.java - Input filter for reading gzip file /* GZIPInputStream.java - Input filter for reading gzip file
Copyright (C) 1999, 2000, 2002 Free Software Foundation, Inc. Copyright (C) 1999, 2000, 2001, 2002, 2004 Free Software Foundation, Inc.
This file is part of GNU Classpath. This file is part of GNU Classpath.
...@@ -41,73 +41,81 @@ import java.io.InputStream; ...@@ -41,73 +41,81 @@ import java.io.InputStream;
import java.io.IOException; import java.io.IOException;
/** /**
* This filter stream is used to decompress a "GZIP" format stream.
* The "GZIP" format is described in RFC 1952.
*
* @author John Leuner
* @author Tom Tromey * @author Tom Tromey
* @date May 17, 1999 * @since JDK 1.1
*/ */
public class GZIPInputStream
/* Written using on-line Java Platform 1.2 API Specification extends InflaterInputStream
* and JCL book.
* Believed complete and correct.
*/
public class GZIPInputStream extends InflaterInputStream
{ {
/**
* The magic number found at the start of a GZIP stream.
*/
public static final int GZIP_MAGIC = 0x8b1f; public static final int GZIP_MAGIC = 0x8b1f;
public void close () throws IOException /**
{ * Creates a GZIPInputStream with the default buffer size.
// Nothing to do here. *
super.close(); * @param in The stream to read compressed data from
} * (in GZIP format).
*
public GZIPInputStream (InputStream istream) throws IOException * @throws IOException if an error occurs during an I/O operation.
*/
public GZIPInputStream(InputStream in)
throws IOException
{ {
this (istream, 512); this(in, 512);
} }
private final int eof_read () throws IOException /**
{ * Creates a GZIPInputStream with the specified buffer size.
int r = in.read(); *
if (r == -1) * @param in The stream to read compressed data from
throw new ZipException ("gzip header corrupted"); * (in GZIP format).
return r & 0xff; * @param size The size of the buffer to use.
} *
* @throws IOException if an error occurs during an I/O operation.
public GZIPInputStream (InputStream istream, int readsize) * @throws IllegalArgumentException if <code>size</code>
* is less than or equal to 0.
*/
public GZIPInputStream(InputStream in, int size)
throws IOException throws IOException
{ {
super (istream, new Inflater (true), readsize); super(in, new Inflater(true), size);
// NOTE: header reading code taken from zlib's gzio.c. // NOTE: header reading code taken from zlib's gzio.c.
// Read the magic number. // Read the magic number.
int magic = eof_read () | (eof_read () << 8); int magic = eof_read() | (eof_read() << 8);
if (magic != GZIP_MAGIC) if (magic != GZIP_MAGIC)
throw new ZipException ("gzip header corrupted"); throw new ZipException("gzip header corrupted");
int method = eof_read (); int method = eof_read();
int flags = eof_read (); int flags = eof_read();
// Test from zlib. // Test from zlib.
if (method != Z_DEFLATED || (flags & RESERVED) != 0) if (method != Z_DEFLATED || (flags & RESERVED) != 0)
throw new ZipException ("gzip header corrupted"); throw new ZipException("gzip header corrupted");
// Discard time, xflags, OS code. // Discard time, xflags, OS code.
for (int i = 0; i < 6; ++i) for (int i = 0; i < 6; ++i)
eof_read (); eof_read();
// Skip the extra field. // Skip the extra field.
if ((flags & EXTRA_FIELD) != 0) if ((flags & EXTRA_FIELD) != 0)
{ {
int len = eof_read () | (eof_read () << 8); int len = eof_read() | (eof_read() << 8);
while (len-- != 0) while (len-- != 0)
eof_read (); eof_read();
} }
if ((flags & ORIG_NAME) != 0) if ((flags & ORIG_NAME) != 0)
{ {
while (true) while (true)
{ {
int c = eof_read (); int c = eof_read();
if (c == 0) if (c == 0)
break; break;
} }
...@@ -117,7 +125,7 @@ public class GZIPInputStream extends InflaterInputStream ...@@ -117,7 +125,7 @@ public class GZIPInputStream extends InflaterInputStream
{ {
while (true) while (true)
{ {
int c = eof_read (); int c = eof_read();
if (c == 0) if (c == 0)
break; break;
} }
...@@ -126,46 +134,78 @@ public class GZIPInputStream extends InflaterInputStream ...@@ -126,46 +134,78 @@ public class GZIPInputStream extends InflaterInputStream
if ((flags & HEAD_CRC) != 0) if ((flags & HEAD_CRC) != 0)
{ {
// FIXME: consider checking CRC of the header. // FIXME: consider checking CRC of the header.
eof_read (); eof_read();
eof_read (); eof_read();
} }
crc = new CRC32 (); crc = new CRC32();
}
/**
* Closes the input stream.
*
* @throws IOException if an error occurs during an I/O operation.
*/
public void close()
throws IOException
{
// Nothing to do here.
super.close();
}
private final int eof_read() throws IOException
{
int r = in.read();
if (r == -1)
throw new ZipException("gzip header corrupted");
return r & 0xff;
} }
public int read (byte[] buf, int off, int len) throws IOException /**
* Reads in GZIP-compressed data and stores it in uncompressed form
* into an array of bytes. The method will block until either
* enough input data becomes available or the compressed stream
* reaches its end.
*
* @param buf the buffer into which the uncompressed data will
* be stored.
* @param offset the offset indicating where in <code>buf</code>
* the uncompressed data should be placed.
* @param len the number of uncompressed bytes to be read.
*/
public int read(byte[] buf, int offset, int len) throws IOException
{ {
if (eos) if (eos)
return -1; return -1;
int r = super.read(buf, off, len); int r = super.read(buf, offset, len);
if (r == -1) if (r == -1)
{ {
eos = true; eos = true;
byte[] tmp = new byte[8]; byte[] tmp = new byte[8];
// First copy remaining bytes from inflater input buffer. // First copy remaining bytes from inflater input buffer.
int avail = inf.getRemaining (); int avail = inf.getRemaining();
System.arraycopy (this.buf, this.len - avail, tmp, 0, avail); System.arraycopy(this.buf, this.len - avail, tmp, 0, avail);
// Now read remaining bytes from wrapped input stream. // Now read remaining bytes from wrapped input stream.
for (int i = avail; i < 8; ++i) for (int i = avail; i < 8; ++i)
{ {
tmp[i] = (byte) eof_read (); tmp[i] = (byte) eof_read();
} }
int header_crc = read4 (tmp, 0); int header_crc = read4(tmp, 0);
if (crc.getValue() != header_crc) if (crc.getValue() != header_crc)
throw new ZipException ("corrupted gzip file - crc mismatch"); throw new ZipException("corrupted gzip file - crc mismatch");
int isize = read4 (tmp, 4); int isize = read4(tmp, 4);
if (inf.getTotalOut() != isize) if (inf.getTotalOut() != isize)
throw new ZipException ("corrupted gzip file - size mismatch"); throw new ZipException("corrupted gzip file - size mismatch");
return -1; return -1;
} }
crc.update(buf, off, r); crc.update(buf, offset, r);
return r; return r;
} }
private final int read4 (byte[] buf, int offset) throws IOException private final int read4(byte[] buf, int offset) throws IOException
{ {
return (((buf[offset + 3] & 0xFF) << 24) + ((buf[offset + 2] & 0xFF) << 16) return (((buf[offset + 3] & 0xFF) << 24) + ((buf[offset + 2] & 0xFF) << 16)
+ ((buf[offset + 1] & 0xFF) << 8) + (buf[offset] & 0xFF)); + ((buf[offset + 1] & 0xFF) << 8) + (buf[offset] & 0xFF));
......
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