org.apache.tools.tar.TarOutputStream Maven / Gradle / Ivy
/*
* 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
* ([email protected]) to whom the Ant project is very grateful for his great code.
*/
package org.apache.tools.tar;
import java.io.FilterOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.io.StringWriter;
import java.nio.ByteBuffer;
import java.util.Date;
import java.util.HashMap;
import java.util.Map;
import org.apache.tools.zip.ZipEncoding;
import org.apache.tools.zip.ZipEncodingHelper;
/**
* The TarOutputStream writes a UNIX tar archive as an OutputStream.
* Methods are provided to put entries, and then write their contents
* by writing to this stream using write().
*
*/
public class TarOutputStream extends FilterOutputStream {
/** Fail if a long file name is required in the archive. */
public static final int LONGFILE_ERROR = 0;
/** Long paths will be truncated in the archive. */
public static final int LONGFILE_TRUNCATE = 1;
/** GNU tar extensions are used to store long file names in the archive. */
public static final int LONGFILE_GNU = 2;
/** POSIX/PAX extensions are used to store long file names in the archive. */
public static final int LONGFILE_POSIX = 3;
/** Fail if a big number (e.g. size > 8GiB) is required in the archive. */
public static final int BIGNUMBER_ERROR = 0;
/** star/GNU tar/BSD tar extensions are used to store big number in the archive. */
public static final int BIGNUMBER_STAR = 1;
/** POSIX/PAX extensions are used to store big numbers in the archive. */
public static final int BIGNUMBER_POSIX = 2;
// CheckStyle:VisibilityModifier OFF - bc
protected boolean debug;
protected long currSize;
protected String currName;
protected long currBytes;
protected byte[] oneBuf;
protected byte[] recordBuf;
protected int assemLen;
protected byte[] assemBuf;
protected TarBuffer buffer;
protected int longFileMode = LONGFILE_ERROR;
// CheckStyle:VisibilityModifier ON
private int bigNumberMode = BIGNUMBER_ERROR;
private boolean closed = false;
/** Indicates if putNextEntry has been called without closeEntry */
private boolean haveUnclosedEntry = false;
/** indicates if this archive is finished */
private boolean finished = false;
private final ZipEncoding encoding;
private boolean addPaxHeadersForNonAsciiNames = false;
private static final ZipEncoding ASCII =
ZipEncodingHelper.getZipEncoding("ASCII");
/**
* Constructor for TarInputStream.
* @param os the output stream to use
*/
public TarOutputStream(OutputStream os) {
this(os, TarBuffer.DEFAULT_BLKSIZE, TarBuffer.DEFAULT_RCDSIZE);
}
/**
* Constructor for TarInputStream.
* @param os the output stream to use
* @param encoding name of the encoding to use for file names
*/
public TarOutputStream(OutputStream os, String encoding) {
this(os, TarBuffer.DEFAULT_BLKSIZE, TarBuffer.DEFAULT_RCDSIZE, encoding);
}
/**
* Constructor for TarInputStream.
* @param os the output stream to use
* @param blockSize the block size to use
*/
public TarOutputStream(OutputStream os, int blockSize) {
this(os, blockSize, TarBuffer.DEFAULT_RCDSIZE);
}
/**
* Constructor for TarInputStream.
* @param os the output stream to use
* @param blockSize the block size to use
* @param encoding name of the encoding to use for file names
*/
public TarOutputStream(OutputStream os, int blockSize, String encoding) {
this(os, blockSize, TarBuffer.DEFAULT_RCDSIZE, encoding);
}
/**
* Constructor for TarInputStream.
* @param os the output stream to use
* @param blockSize the block size to use
* @param recordSize the record size to use
*/
public TarOutputStream(OutputStream os, int blockSize, int recordSize) {
this(os, blockSize, recordSize, null);
}
/**
* Constructor for TarInputStream.
* @param os the output stream to use
* @param blockSize the block size to use
* @param recordSize the record size to use
* @param encoding name of the encoding to use for file names
*/
public TarOutputStream(OutputStream os, int blockSize, int recordSize,
String encoding) {
super(os);
this.encoding = ZipEncodingHelper.getZipEncoding(encoding);
this.buffer = new TarBuffer(os, blockSize, recordSize);
this.debug = false;
this.assemLen = 0;
this.assemBuf = new byte[recordSize];
this.recordBuf = new byte[recordSize];
this.oneBuf = new byte[1];
}
/**
* Set the long file mode.
* This can be LONGFILE_ERROR(0), LONGFILE_TRUNCATE(1) or LONGFILE_GNU(2).
* This specifies the treatment of long file names (names >= TarConstants.NAMELEN).
* Default is LONGFILE_ERROR.
* @param longFileMode the mode to use
*/
public void setLongFileMode(int longFileMode) {
this.longFileMode = longFileMode;
}
/**
* Set the big number mode.
* This can be BIGNUMBER_ERROR(0), BIGNUMBER_POSIX(1) or BIGNUMBER_STAR(2).
* This specifies the treatment of big files (sizes > TarConstants.MAXSIZE) and other numeric values to big to fit into a traditional tar header.
* Default is BIGNUMBER_ERROR.
* @param bigNumberMode the mode to use
*/
public void setBigNumberMode(int bigNumberMode) {
this.bigNumberMode = bigNumberMode;
}
/**
* Whether to add a PAX extension header for non-ASCII file names.
*/
public void setAddPaxHeadersForNonAsciiNames(boolean b) {
addPaxHeadersForNonAsciiNames = b;
}
/**
* Sets the debugging flag.
*
* @param debugF True to turn on debugging.
*/
public void setDebug(boolean debugF) {
this.debug = debugF;
}
/**
* Sets the debugging flag in this stream's TarBuffer.
*
* @param debug True to turn on debugging.
*/
public void setBufferDebug(boolean debug) {
buffer.setDebug(debug);
}
/**
* Ends the TAR archive without closing the underlying OutputStream.
*
* An archive consists of a series of file entries terminated by an
* end-of-archive entry, which consists of two 512 blocks of zero bytes.
* POSIX.1 requires two EOF records, like some other implementations.
*
* @throws IOException on error
*/
public void finish() throws IOException {
if (finished) {
throw new IOException("This archive has already been finished");
}
if (haveUnclosedEntry) {
throw new IOException("This archives contains unclosed entries.");
}
writeEOFRecord();
writeEOFRecord();
buffer.flushBlock();
finished = true;
}
/**
* Ends the TAR archive and closes the underlying OutputStream.
* This means that finish() is called followed by calling the
* TarBuffer's close().
* @throws IOException on error
*/
@Override
public void close() throws IOException {
if(!finished) {
finish();
}
if (!closed) {
buffer.close();
out.close();
closed = true;
}
}
/**
* Get the record size being used by this stream's TarBuffer.
*
* @return The TarBuffer record size.
*/
public int getRecordSize() {
return buffer.getRecordSize();
}
/**
* Put an entry on the output stream. This writes the entry's
* header record and positions the output stream for writing
* the contents of the entry. Once this method is called, the
* stream is ready for calls to write() to write the entry's
* contents. Once the contents are written, closeEntry()
* MUST be called to ensure that all buffered data
* is completely written to the output stream.
*
* @param entry The TarEntry to be written to the archive.
* @throws IOException on error
*/
public void putNextEntry(TarEntry entry) throws IOException {
if(finished) {
throw new IOException("Stream has already been finished");
}
Map paxHeaders = new HashMap();
final String entryName = entry.getName();
boolean paxHeaderContainsPath = handleLongName(entry, entryName, paxHeaders, "path",
TarConstants.LF_GNUTYPE_LONGNAME, "file name");
final String linkName = entry.getLinkName();
boolean paxHeaderContainsLinkPath = linkName != null && linkName.length() > 0
&& handleLongName(entry, linkName, paxHeaders, "linkpath",
TarConstants.LF_GNUTYPE_LONGLINK, "link name");
if (bigNumberMode == BIGNUMBER_POSIX) {
addPaxHeadersForBigNumbers(paxHeaders, entry);
} else if (bigNumberMode != BIGNUMBER_STAR) {
failForBigNumbers(entry);
}
if (addPaxHeadersForNonAsciiNames && !paxHeaderContainsPath
&& !ASCII.canEncode(entryName)) {
paxHeaders.put("path", entryName);
}
if (addPaxHeadersForNonAsciiNames && !paxHeaderContainsLinkPath
&& (entry.isLink() || entry.isSymbolicLink())
&& !ASCII.canEncode(linkName)) {
paxHeaders.put("linkpath", linkName);
}
if (paxHeaders.size() > 0) {
writePaxHeaders(entry, entryName, paxHeaders);
}
entry.writeEntryHeader(recordBuf, encoding,
bigNumberMode == BIGNUMBER_STAR);
buffer.writeRecord(recordBuf);
currBytes = 0;
if (entry.isDirectory()) {
currSize = 0;
} else {
currSize = entry.getSize();
}
currName = entryName;
haveUnclosedEntry = true;
}
/**
* Close an entry. This method MUST be called for all file
* entries that contain data. The reason is that we must
* buffer data written to the stream in order to satisfy
* the buffer's record based writes. Thus, there may be
* data fragments still being assembled that must be written
* to the output stream before this entry is closed and the
* next entry written.
* @throws IOException on error
*/
public void closeEntry() throws IOException {
if (finished) {
throw new IOException("Stream has already been finished");
}
if (!haveUnclosedEntry){
throw new IOException("No current entry to close");
}
if (assemLen > 0) {
for (int i = assemLen; i < assemBuf.length; ++i) {
assemBuf[i] = 0;
}
buffer.writeRecord(assemBuf);
currBytes += assemLen;
assemLen = 0;
}
if (currBytes < currSize) {
throw new IOException("entry '" + currName + "' closed at '"
+ currBytes
+ "' before the '" + currSize
+ "' bytes specified in the header were written");
}
haveUnclosedEntry = false;
}
/**
* Writes a byte to the current tar archive entry.
*
* This method simply calls read( byte[], int, int ).
*
* @param b The byte written.
* @throws IOException on error
*/
@Override
public void write(int b) throws IOException {
oneBuf[0] = (byte) b;
write(oneBuf, 0, 1);
}
/**
* Writes bytes to the current tar archive entry.
*
* This method simply calls write( byte[], int, int ).
*
* @param wBuf The buffer to write to the archive.
* @throws IOException on error
*/
@Override
public void write(byte[] wBuf) throws IOException {
write(wBuf, 0, wBuf.length);
}
/**
* Writes bytes to the current tar archive entry. This method
* is aware of the current entry and will throw an exception if
* you attempt to write bytes past the length specified for the
* current entry. The method is also (painfully) aware of the
* record buffering required by TarBuffer, and manages buffers
* that are not a multiple of recordsize in length, including
* assembling records from small buffers.
*
* @param wBuf The buffer to write to the archive.
* @param wOffset The offset in the buffer from which to get bytes.
* @param numToWrite The number of bytes to write.
* @throws IOException on error
*/
@Override
public void write(byte[] wBuf, int wOffset, int numToWrite) throws IOException {
if ((currBytes + numToWrite) > currSize) {
throw new IOException("request to write '" + numToWrite
+ "' bytes exceeds size in header of '"
+ currSize + "' bytes for entry '"
+ currName + "'");
//
// We have to deal with assembly!!!
// The programmer can be writing little 32 byte chunks for all
// we know, and we must assemble complete records for writing.
// REVIEW Maybe this should be in TarBuffer? Could that help to
// eliminate some of the buffer copying.
//
}
if (assemLen > 0) {
if ((assemLen + numToWrite) >= recordBuf.length) {
int aLen = recordBuf.length - assemLen;
System.arraycopy(assemBuf, 0, recordBuf, 0,
assemLen);
System.arraycopy(wBuf, wOffset, recordBuf,
assemLen, aLen);
buffer.writeRecord(recordBuf);
currBytes += recordBuf.length;
wOffset += aLen;
numToWrite -= aLen;
assemLen = 0;
} else {
System.arraycopy(wBuf, wOffset, assemBuf, assemLen,
numToWrite);
wOffset += numToWrite;
assemLen += numToWrite;
numToWrite = 0;
}
}
//
// When we get here we have EITHER:
// o An empty "assemble" buffer.
// o No bytes to write (numToWrite == 0)
//
while (numToWrite > 0) {
if (numToWrite < recordBuf.length) {
System.arraycopy(wBuf, wOffset, assemBuf, assemLen,
numToWrite);
assemLen += numToWrite;
break;
}
buffer.writeRecord(wBuf, wOffset);
int num = recordBuf.length;
currBytes += num;
numToWrite -= num;
wOffset += num;
}
}
/**
* Writes a PAX extended header with the given map as contents.
*/
void writePaxHeaders(TarEntry entry,
String entryName,
Map headers) throws IOException {
String name = "./PaxHeaders.X/" + stripTo7Bits(entryName);
if (name.length() >= TarConstants.NAMELEN) {
name = name.substring(0, TarConstants.NAMELEN - 1);
}
while (name.endsWith("/")) {
// TarEntry's constructor would think this is a directory
// and not allow any data to be written
name = name.substring(0, name.length() - 1);
}
TarEntry pex = new TarEntry(name,
TarConstants.LF_PAX_EXTENDED_HEADER_LC);
transferModTime(entry, pex);
StringWriter w = new StringWriter();
for (Map.Entry h : headers.entrySet()) {
String key = h.getKey();
String value = h.getValue();
int len = key.length() + value.length()
+ 3 /* blank, equals and newline */
+ 2 /* guess 9 < actual length < 100 */;
String line = len + " " + key + "=" + value + "\n";
int actualLength = line.getBytes("UTF-8").length;
while (len != actualLength) {
// Adjust for cases where length < 10 or > 100
// or where UTF-8 encoding isn't a single octet
// per character.
// Must be in loop as size may go from 99 to 100 in
// first pass so we'd need a second.
len = actualLength;
line = len + " " + key + "=" + value + "\n";
actualLength = line.getBytes("UTF-8").length;
}
w.write(line);
}
byte[] data = w.toString().getBytes("UTF-8");
pex.setSize(data.length);
putNextEntry(pex);
write(data);
closeEntry();
}
private String stripTo7Bits(String name) {
final int length = name.length();
StringBuilder result = new StringBuilder(length);
for (int i = 0; i < length; i++) {
char stripped = (char) (name.charAt(i) & 0x7F);
if (stripped != 0) { // would be read as Trailing null
result.append(stripped);
}
}
return result.toString();
}
/**
* Write an EOF (end of archive) record to the tar archive.
* An EOF record consists of a record of all zeros.
*/
private void writeEOFRecord() throws IOException {
for (int i = 0; i < recordBuf.length; ++i) {
recordBuf[i] = 0;
}
buffer.writeRecord(recordBuf);
}
private void addPaxHeadersForBigNumbers(Map paxHeaders,
TarEntry entry) {
addPaxHeaderForBigNumber(paxHeaders, "size", entry.getSize(),
TarConstants.MAXSIZE);
addPaxHeaderForBigNumber(paxHeaders, "gid", entry.getLongGroupId(),
TarConstants.MAXID);
addPaxHeaderForBigNumber(paxHeaders, "mtime",
entry.getModTime().getTime() / 1000,
TarConstants.MAXSIZE);
addPaxHeaderForBigNumber(paxHeaders, "uid", entry.getLongUserId(),
TarConstants.MAXID);
// star extensions by J\u00f6rg Schilling
addPaxHeaderForBigNumber(paxHeaders, "SCHILY.devmajor",
entry.getDevMajor(), TarConstants.MAXID);
addPaxHeaderForBigNumber(paxHeaders, "SCHILY.devminor",
entry.getDevMinor(), TarConstants.MAXID);
// there is no PAX header for file mode
failForBigNumber("mode", entry.getMode(), TarConstants.MAXID);
}
private void addPaxHeaderForBigNumber(Map paxHeaders,
String header, long value,
long maxValue) {
if (value < 0 || value > maxValue) {
paxHeaders.put(header, String.valueOf(value));
}
}
private void failForBigNumbers(TarEntry entry) {
failForBigNumber("entry size", entry.getSize(), TarConstants.MAXSIZE);
failForBigNumberWithPosixMessage("group id", entry.getLongGroupId(), TarConstants.MAXID);
failForBigNumber("last modification time",
entry.getModTime().getTime() / 1000,
TarConstants.MAXSIZE);
failForBigNumber("user id", entry.getLongUserId(), TarConstants.MAXID);
failForBigNumber("mode", entry.getMode(), TarConstants.MAXID);
failForBigNumber("major device number", entry.getDevMajor(),
TarConstants.MAXID);
failForBigNumber("minor device number", entry.getDevMinor(),
TarConstants.MAXID);
}
private void failForBigNumber(String field, long value, long maxValue) {
failForBigNumber(field, value, maxValue, "");
}
private void failForBigNumberWithPosixMessage(String field, long value, long maxValue) {
failForBigNumber(field, value, maxValue, " Use STAR or POSIX extensions to overcome this limit");
}
private void failForBigNumber(String field, long value, long maxValue, String additionalMsg) {
if (value < 0 || value > maxValue) {
throw new RuntimeException(field + " '" + value //NOSONAR
+ "' is too big ( > "
+ maxValue + " )");
}
}
/**
* Handles long file or link names according to the longFileMode setting.
*
* I.e. if the given name is too long to be written to a plain
* tar header then
*
* - it creates a pax header who's name is given by the
* paxHeaderName parameter if longFileMode is POSIX
* - it creates a GNU longlink entry who's type is given by
* the linkType parameter if longFileMode is GNU
* - it throws an exception if longFileMode is ERROR
* - it truncates the name if longFileMode is TRUNCATE
*
*
* @param entry entry the name belongs to
* @param name the name to write
* @param paxHeaders current map of pax headers
* @param paxHeaderName name of the pax header to write
* @param linkType type of the GNU entry to write
* @param fieldName the name of the field
* @return whether a pax header has been written.
*/
private boolean handleLongName(TarEntry entry , String name,
Map paxHeaders,
String paxHeaderName, byte linkType, String fieldName)
throws IOException {
final ByteBuffer encodedName = encoding.encode(name);
final int len = encodedName.limit() - encodedName.position();
if (len >= TarConstants.NAMELEN) {
if (longFileMode == LONGFILE_POSIX) {
paxHeaders.put(paxHeaderName, name);
return true;
} else if (longFileMode == LONGFILE_GNU) {
// create a TarEntry for the LongLink, the contents
// of which are the link's name
TarEntry longLinkEntry =
new TarEntry(TarConstants.GNU_LONGLINK, linkType);
longLinkEntry.setSize(len + 1); // +1 for NUL
transferModTime(entry, longLinkEntry);
putNextEntry(longLinkEntry);
write(encodedName.array(), encodedName.arrayOffset(), len);
write(0); // NUL terminator
closeEntry();
} else if (longFileMode != LONGFILE_TRUNCATE) {
throw new RuntimeException(fieldName + " '" + name //NOSONAR
+ "' is too long ( > "
+ TarConstants.NAMELEN + " bytes)");
}
}
return false;
}
private void transferModTime(TarEntry from, TarEntry to) {
Date fromModTime = from.getModTime();
long fromModTimeSeconds = fromModTime.getTime() / 1000;
if (fromModTimeSeconds < 0 || fromModTimeSeconds > TarConstants.MAXSIZE) {
fromModTime = new Date(0);
}
to.setModTime(fromModTime);
}
}