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4691425: GZIPInputStream fails to read concatenated .gz files

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To support concatenated .gz streams

Reviewed-by: martin
This commit is contained in:
Xueming Shen 2010-05-24 00:39:57 -04:00
parent 480f0af4e8
commit 0bc8b10673
2 changed files with 149 additions and 18 deletions
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67
jdk/src/share/classes/java/util/zip/GZIPInputStream.java
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@ -1,5 +1,5 @@
/*
* Copyright 1996-2006 Sun Microsystems, Inc. All Rights Reserved.
* Copyright 1996-2010 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
@ -75,8 +75,7 @@ class GZIPInputStream extends InflaterInputStream {
public GZIPInputStream(InputStream in, int size) throws IOException {
super(in, new Inflater(true), size);
usesDefaultInflater = true;
readHeader();
crc.reset();
readHeader(in);
}
/**
@ -114,14 +113,16 @@ class GZIPInputStream extends InflaterInputStream {
if (eos) {
return -1;
}
len = super.read(buf, off, len);
if (len == -1) {
readTrailer();
eos = true;
int n = super.read(buf, off, len);
if (n == -1) {
if (readTrailer())
eos = true;
else
return this.read(buf, off, len);
} else {
crc.update(buf, off, len);
crc.update(buf, off, n);
}
return len;
return n;
}
/**
@ -152,10 +153,11 @@ class GZIPInputStream extends InflaterInputStream {
private final static int FCOMMENT = 16; // File comment
/*
* Reads GZIP member header.
* Reads GZIP member header and returns the total byte number
* of this member header.
*/
private void readHeader() throws IOException {
CheckedInputStream in = new CheckedInputStream(this.in, crc);
private int readHeader(InputStream this_in) throws IOException {
CheckedInputStream in = new CheckedInputStream(this_in, crc);
crc.reset();
// Check header magic
if (readUShort(in) != GZIP_MAGIC) {
@ -169,17 +171,24 @@ class GZIPInputStream extends InflaterInputStream {
int flg = readUByte(in);
// Skip MTIME, XFL, and OS fields
skipBytes(in, 6);
int n = 2 + 2 + 6;
// Skip optional extra field
if ((flg & FEXTRA) == FEXTRA) {
skipBytes(in, readUShort(in));
int m = readUShort(in);
skipBytes(in, m);
n += m + 2;
}
// Skip optional file name
if ((flg & FNAME) == FNAME) {
while (readUByte(in) != 0) ;
do {
n++;
} while (readUByte(in) != 0);
}
// Skip optional file comment
if ((flg & FCOMMENT) == FCOMMENT) {
while (readUByte(in) != 0) ;
do {
n++;
} while (readUByte(in) != 0);
}
// Check optional header CRC
if ((flg & FHCRC) == FHCRC) {
@ -187,13 +196,18 @@ class GZIPInputStream extends InflaterInputStream {
if (readUShort(in) != v) {
throw new ZipException("Corrupt GZIP header");
}
n += 2;
}
crc.reset();
return n;
}
/*
* Reads GZIP member trailer.
* Reads GZIP member trailer and returns true if the eos
* reached, false if there are more (concatenated gzip
* data set)
*/
private void readTrailer() throws IOException {
private boolean readTrailer() throws IOException {
InputStream in = this.in;
int n = inf.getRemaining();
if (n > 0) {
@ -205,6 +219,24 @@ class GZIPInputStream extends InflaterInputStream {
// rfc1952; ISIZE is the input size modulo 2^32
(readUInt(in) != (inf.getBytesWritten() & 0xffffffffL)))
throw new ZipException("Corrupt GZIP trailer");
// If there are more bytes available in "in" or
// the leftover in the "inf" is > 26 bytes:
// this.trailer(8) + next.header.min(10) + next.trailer(8)
// try concatenated case
if (this.in.available() > 0 || n > 26) {
int m = 8; // this.trailer
try {
m += readHeader(in); // next.header
} catch (IOException ze) {
return true; // ignore any malformed, do nothing
}
inf.reset();
if (n > m)
inf.setInput(buf, len - n + m, n - m);
return false;
}
return true;
}
/*
@ -239,7 +271,6 @@ class GZIPInputStream extends InflaterInputStream {
return b;
}
private byte[] tmpbuf = new byte[128];
/*

100
jdk/test/java/util/zip/GZIP/GZIPInputStreamRead.java Normal file
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@ -0,0 +1,100 @@
/*
* Copyright 2010 Sun Microsystems, Inc. All Rights Reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation.
*
* This code 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
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
* CA 95054 USA or visit www.sun.com if you need additional information or
* have any questions.
*/
/* @test
* @bug 4691425
* @summary Test the read and write of GZIPInput/OutputStream, including
* concatenated .gz inputstream
*/
import java.io.*;
import java.util.*;
import java.util.zip.*;
public class GZIPInputStreamRead {
public static void main(String[] args) throws Throwable {
Random rnd = new Random();
for (int i = 1; i < 100; i++) {
int members = rnd.nextInt(10) + 1;
ByteArrayOutputStream srcBAOS = new ByteArrayOutputStream();
ByteArrayOutputStream dstBAOS = new ByteArrayOutputStream();
for (int j = 0; j < members; j++) {
byte[] src = new byte[rnd.nextInt(8192) + 1];
rnd.nextBytes(src);
srcBAOS.write(src);
GZIPOutputStream gzos = new GZIPOutputStream(dstBAOS);
gzos.write(src);
gzos.close();
}
byte[] srcBytes = srcBAOS.toByteArray();
byte[] dstBytes = dstBAOS.toByteArray();
// try different size of buffer to read the
// GZIPInputStream
/* just for fun when running manually
for (int j = 1; j < 10; j++) {
test(srcBytes, dstBytes, j);
}
*/
for (int j = 0; j < 10; j++) {
int readBufSZ = rnd.nextInt(2048) + 1;
test(srcBytes,
dstBytes,
readBufSZ,
512); // the defualt buffer size
test(srcBytes,
dstBytes,
readBufSZ,
rnd.nextInt(4096) + 1);
}
}
}
private static void test(byte[] src, byte[] dst,
int readBufSize, int gzisBufSize)
throws Throwable
{
GZIPInputStream gzis = new GZIPInputStream(
new ByteArrayInputStream(dst),
gzisBufSize);
byte[] result = new byte[src.length + 10];
byte[] buf = new byte[readBufSize];
int n = 0;
int off = 0;
while ((n = gzis.read(buf, 0, buf.length)) != -1) {
System.arraycopy(buf, 0, result, off, n);
off += n;
// no range check, if overflow, let it fail
}
if (off != src.length || gzis.available() != 0 ||
!Arrays.equals(src, Arrays.copyOf(result, off))) {
throw new RuntimeException(
"GZIPInputStream reading failed! " +
", src.len=" + src.length +
", read=" + off);
}
gzis.close();
}
}