org.apache.commons.compress.archivers.zip.ZipArchiveEntry Maven / Gradle / Ivy
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/*
* 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.
*
*/
package org.apache.commons.compress.archivers.zip;
import org.apache.commons.compress.archivers.ArchiveEntry;
import java.io.File;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.zip.ZipException;
/**
* Extension that adds better handling of extra fields and provides
* access to the internal and external file attributes.
*
* The extra data is expected to follow the recommendation of
* {@link
* APPNOTE.txt}:
*
* - the extra byte array consists of a sequence of extra fields
* - each extra fields starts by a two byte header id followed by
* a two byte sequence holding the length of the remainder of
* data.
*
*
* Any extra data that cannot be parsed by the rules above will be
* consumed as "unparseable" extra data and treated differently by the
* methods of this class. Versions prior to Apache Commons Compress
* 1.1 would have thrown an exception if any attempt was made to read
* or write extra data not conforming to the recommendation.
*
* @NotThreadSafe
*/
public class ZipArchiveEntry extends java.util.zip.ZipEntry
implements ArchiveEntry {
public static final int PLATFORM_UNIX = 3;
public static final int PLATFORM_FAT = 0;
private static final int SHORT_MASK = 0xFFFF;
private static final int SHORT_SHIFT = 16;
private static final byte[] EMPTY = new byte[0];
/**
* The {@link java.util.zip.ZipEntry} base class only supports
* the compression methods STORED and DEFLATED. We override the
* field so that any compression methods can be used.
*
* The default value -1 means that the method has not been specified.
*
* @see COMPRESS-93
*/
private int method = -1;
/**
* The {@link java.util.zip.ZipEntry#setSize} method in the base
* class throws an IllegalArgumentException if the size is bigger
* than 2GB for Java versions < 7. Need to keep our own size
* information for Zip64 support.
*/
private long size = SIZE_UNKNOWN;
private int internalAttributes = 0;
private int platform = PLATFORM_FAT;
private long externalAttributes = 0;
private LinkedHashMap extraFields = null;
private UnparseableExtraFieldData unparseableExtra = null;
private String name = null;
private byte[] rawName = null;
private GeneralPurposeBit gpb = new GeneralPurposeBit();
/**
* Creates a new zip entry with the specified name.
*
* Assumes the entry represents a directory if and only if the
* name ends with a forward slash "/".
*
* @param name the name of the entry
*/
public ZipArchiveEntry(String name) {
super(name);
setName(name);
}
/**
* Creates a new zip entry with fields taken from the specified zip entry.
*
* Assumes the entry represents a directory if and only if the
* name ends with a forward slash "/".
*
* @param entry the entry to get fields from
* @throws ZipException on error
*/
public ZipArchiveEntry(java.util.zip.ZipEntry entry) throws ZipException {
super(entry);
setName(entry.getName());
byte[] extra = entry.getExtra();
if (extra != null) {
setExtraFields(ExtraFieldUtils.parse(extra, true,
ExtraFieldUtils
.UnparseableExtraField.READ));
} else {
// initializes extra data to an empty byte array
setExtra();
}
setMethod(entry.getMethod());
this.size = entry.getSize();
}
/**
* Creates a new zip entry with fields taken from the specified zip entry.
*
* Assumes the entry represents a directory if and only if the
* name ends with a forward slash "/".
*
* @param entry the entry to get fields from
* @throws ZipException on error
*/
public ZipArchiveEntry(ZipArchiveEntry entry) throws ZipException {
this((java.util.zip.ZipEntry) entry);
setInternalAttributes(entry.getInternalAttributes());
setExternalAttributes(entry.getExternalAttributes());
setExtraFields(entry.getExtraFields(true));
}
/**
*/
protected ZipArchiveEntry() {
this("");
}
/**
* Creates a new zip entry taking some information from the given
* file and using the provided name.
*
* The name will be adjusted to end with a forward slash "/" if
* the file is a directory. If the file is not a directory a
* potential trailing forward slash will be stripped from the
* entry name.
*/
public ZipArchiveEntry(File inputFile, String entryName) {
this(inputFile.isDirectory() && !entryName.endsWith("/") ?
entryName + "/" : entryName);
if (inputFile.isFile()){
setSize(inputFile.length());
}
setTime(inputFile.lastModified());
// TODO are there any other fields we can set here?
}
/**
* Overwrite clone.
* @return a cloned copy of this ZipArchiveEntry
*/
@Override
public Object clone() {
ZipArchiveEntry e = (ZipArchiveEntry) super.clone();
e.setInternalAttributes(getInternalAttributes());
e.setExternalAttributes(getExternalAttributes());
e.setExtraFields(getExtraFields(true));
return e;
}
/**
* Returns the compression method of this entry, or -1 if the
* compression method has not been specified.
*
* @return compression method
*
* @since 1.1
*/
@Override
public int getMethod() {
return method;
}
/**
* Sets the compression method of this entry.
*
* @param method compression method
*
* @since 1.1
*/
@Override
public void setMethod(int method) {
if (method < 0) {
throw new IllegalArgumentException(
"ZIP compression method can not be negative: " + method);
}
this.method = method;
}
/**
* Retrieves the internal file attributes.
*
* @return the internal file attributes
*/
public int getInternalAttributes() {
return internalAttributes;
}
/**
* Sets the internal file attributes.
* @param value an int value
*/
public void setInternalAttributes(int value) {
internalAttributes = value;
}
/**
* Retrieves the external file attributes.
* @return the external file attributes
*/
public long getExternalAttributes() {
return externalAttributes;
}
/**
* Sets the external file attributes.
* @param value an long value
*/
public void setExternalAttributes(long value) {
externalAttributes = value;
}
/**
* Sets Unix permissions in a way that is understood by Info-Zip's
* unzip command.
* @param mode an int value
*/
public void setUnixMode(int mode) {
// CheckStyle:MagicNumberCheck OFF - no point
setExternalAttributes((mode << SHORT_SHIFT)
// MS-DOS read-only attribute
| ((mode & 0200) == 0 ? 1 : 0)
// MS-DOS directory flag
| (isDirectory() ? 0x10 : 0));
// CheckStyle:MagicNumberCheck ON
platform = PLATFORM_UNIX;
}
/**
* Unix permission.
* @return the unix permissions
*/
public int getUnixMode() {
return platform != PLATFORM_UNIX ? 0 :
(int) ((getExternalAttributes() >> SHORT_SHIFT) & SHORT_MASK);
}
/**
* Returns true if this entry represents a unix symlink,
* in which case the entry's content contains the target path
* for the symlink.
*
* @since 1.5
* @return true if the entry represents a unix symlink, false otherwise.
*/
public boolean isUnixSymlink() {
return (getUnixMode() & UnixStat.LINK_FLAG) == UnixStat.LINK_FLAG;
}
/**
* Platform specification to put into the "version made
* by" part of the central file header.
*
* @return PLATFORM_FAT unless {@link #setUnixMode setUnixMode}
* has been called, in which case PLATFORM_UNIX will be returned.
*/
public int getPlatform() {
return platform;
}
/**
* Set the platform (UNIX or FAT).
* @param platform an int value - 0 is FAT, 3 is UNIX
*/
protected void setPlatform(int platform) {
this.platform = platform;
}
/**
* Replaces all currently attached extra fields with the new array.
* @param fields an array of extra fields
*/
public void setExtraFields(ZipExtraField[] fields) {
extraFields = new LinkedHashMap();
for (ZipExtraField field : fields) {
if (field instanceof UnparseableExtraFieldData) {
unparseableExtra = (UnparseableExtraFieldData) field;
} else {
extraFields.put(field.getHeaderId(), field);
}
}
setExtra();
}
/**
* Retrieves all extra fields that have been parsed successfully.
* @return an array of the extra fields
*/
public ZipExtraField[] getExtraFields() {
return getExtraFields(false);
}
/**
* Retrieves extra fields.
* @param includeUnparseable whether to also return unparseable
* extra fields as {@link UnparseableExtraFieldData} if such data
* exists.
* @return an array of the extra fields
*
* @since 1.1
*/
public ZipExtraField[] getExtraFields(boolean includeUnparseable) {
if (extraFields == null) {
return !includeUnparseable || unparseableExtra == null
? new ZipExtraField[0]
: new ZipExtraField[] { unparseableExtra };
}
List result =
new ArrayList(extraFields.values());
if (includeUnparseable && unparseableExtra != null) {
result.add(unparseableExtra);
}
return result.toArray(new ZipExtraField[0]);
}
/**
* Adds an extra field - replacing an already present extra field
* of the same type.
*
* If no extra field of the same type exists, the field will be
* added as last field.
* @param ze an extra field
*/
public void addExtraField(ZipExtraField ze) {
if (ze instanceof UnparseableExtraFieldData) {
unparseableExtra = (UnparseableExtraFieldData) ze;
} else {
if (extraFields == null) {
extraFields = new LinkedHashMap();
}
extraFields.put(ze.getHeaderId(), ze);
}
setExtra();
}
/**
* Adds an extra field - replacing an already present extra field
* of the same type.
*
* The new extra field will be the first one.
* @param ze an extra field
*/
public void addAsFirstExtraField(ZipExtraField ze) {
if (ze instanceof UnparseableExtraFieldData) {
unparseableExtra = (UnparseableExtraFieldData) ze;
} else {
LinkedHashMap copy = extraFields;
extraFields = new LinkedHashMap();
extraFields.put(ze.getHeaderId(), ze);
if (copy != null) {
copy.remove(ze.getHeaderId());
extraFields.putAll(copy);
}
}
setExtra();
}
/**
* Remove an extra field.
* @param type the type of extra field to remove
*/
public void removeExtraField(ZipShort type) {
if (extraFields == null) {
throw new java.util.NoSuchElementException();
}
if (extraFields.remove(type) == null) {
throw new java.util.NoSuchElementException();
}
setExtra();
}
/**
* Removes unparseable extra field data.
*
* @since 1.1
*/
public void removeUnparseableExtraFieldData() {
if (unparseableExtra == null) {
throw new java.util.NoSuchElementException();
}
unparseableExtra = null;
setExtra();
}
/**
* Looks up an extra field by its header id.
*
* @return null if no such field exists.
*/
public ZipExtraField getExtraField(ZipShort type) {
if (extraFields != null) {
return extraFields.get(type);
}
return null;
}
/**
* Looks up extra field data that couldn't be parsed correctly.
*
* @return null if no such field exists.
*
* @since 1.1
*/
public UnparseableExtraFieldData getUnparseableExtraFieldData() {
return unparseableExtra;
}
/**
* Parses the given bytes as extra field data and consumes any
* unparseable data as an {@link UnparseableExtraFieldData}
* instance.
* @param extra an array of bytes to be parsed into extra fields
* @throws RuntimeException if the bytes cannot be parsed
* @throws RuntimeException on error
*/
@Override
public void setExtra(byte[] extra) throws RuntimeException {
try {
ZipExtraField[] local =
ExtraFieldUtils.parse(extra, true,
ExtraFieldUtils.UnparseableExtraField.READ);
mergeExtraFields(local, true);
} catch (ZipException e) {
// actually this is not possible as of Commons Compress 1.1
throw new RuntimeException("Error parsing extra fields for entry: "
+ getName() + " - " + e.getMessage(), e);
}
}
/**
* Unfortunately {@link java.util.zip.ZipOutputStream
* java.util.zip.ZipOutputStream} seems to access the extra data
* directly, so overriding getExtra doesn't help - we need to
* modify super's data directly.
*/
protected void setExtra() {
super.setExtra(ExtraFieldUtils.mergeLocalFileDataData(getExtraFields(true)));
}
/**
* Sets the central directory part of extra fields.
*/
public void setCentralDirectoryExtra(byte[] b) {
try {
ZipExtraField[] central =
ExtraFieldUtils.parse(b, false,
ExtraFieldUtils.UnparseableExtraField.READ);
mergeExtraFields(central, false);
} catch (ZipException e) {
throw new RuntimeException(e.getMessage(), e);
}
}
/**
* Retrieves the extra data for the local file data.
* @return the extra data for local file
*/
public byte[] getLocalFileDataExtra() {
byte[] extra = getExtra();
return extra != null ? extra : EMPTY;
}
/**
* Retrieves the extra data for the central directory.
* @return the central directory extra data
*/
public byte[] getCentralDirectoryExtra() {
return ExtraFieldUtils.mergeCentralDirectoryData(getExtraFields(true));
}
/**
* Get the name of the entry.
* @return the entry name
*/
@Override
public String getName() {
return name == null ? super.getName() : name;
}
/**
* Is this entry a directory?
* @return true if the entry is a directory
*/
@Override
public boolean isDirectory() {
return getName().endsWith("/");
}
/**
* Set the name of the entry.
* @param name the name to use
*/
protected void setName(String name) {
if (name != null && getPlatform() == PLATFORM_FAT
&& name.indexOf("/") == -1) {
name = name.replace('\\', '/');
}
this.name = name;
}
/**
* Gets the uncompressed size of the entry data.
* @return the entry size
*/
@Override
public long getSize() {
return size;
}
/**
* Sets the uncompressed size of the entry data.
* @param size the uncompressed size in bytes
* @exception IllegalArgumentException if the specified size is less
* than 0
*/
@Override
public void setSize(long size) {
if (size < 0) {
throw new IllegalArgumentException("invalid entry size");
}
this.size = size;
}
/**
* Sets the name using the raw bytes and the string created from
* it by guessing or using the configured encoding.
* @param name the name to use created from the raw bytes using
* the guessed or configured encoding
* @param rawName the bytes originally read as name from the
* archive
* @since 1.2
*/
protected void setName(String name, byte[] rawName) {
setName(name);
this.rawName = rawName;
}
/**
* Returns the raw bytes that made up the name before it has been
* converted using the configured or guessed encoding.
*
* This method will return null if this instance has not been
* read from an archive.
*
* @since 1.2
*/
public byte[] getRawName() {
if (rawName != null) {
byte[] b = new byte[rawName.length];
System.arraycopy(rawName, 0, b, 0, rawName.length);
return b;
}
return null;
}
/**
* Get the hashCode of the entry.
* This uses the name as the hashcode.
* @return a hashcode.
*/
@Override
public int hashCode() {
// this method has severe consequences on performance. We cannot rely
// on the super.hashCode() method since super.getName() always return
// the empty string in the current implemention (there's no setter)
// so it is basically draining the performance of a hashmap lookup
return getName().hashCode();
}
/**
* The "general purpose bit" field.
* @since 1.1
*/
public GeneralPurposeBit getGeneralPurposeBit() {
return gpb;
}
/**
* The "general purpose bit" field.
* @since 1.1
*/
public void setGeneralPurposeBit(GeneralPurposeBit b) {
gpb = b;
}
/**
* If there are no extra fields, use the given fields as new extra
* data - otherwise merge the fields assuming the existing fields
* and the new fields stem from different locations inside the
* archive.
* @param f the extra fields to merge
* @param local whether the new fields originate from local data
*/
private void mergeExtraFields(ZipExtraField[] f, boolean local)
throws ZipException {
if (extraFields == null) {
setExtraFields(f);
} else {
for (ZipExtraField element : f) {
ZipExtraField existing;
if (element instanceof UnparseableExtraFieldData) {
existing = unparseableExtra;
} else {
existing = getExtraField(element.getHeaderId());
}
if (existing == null) {
addExtraField(element);
} else {
if (local) {
byte[] b = element.getLocalFileDataData();
existing.parseFromLocalFileData(b, 0, b.length);
} else {
byte[] b = element.getCentralDirectoryData();
existing.parseFromCentralDirectoryData(b, 0, b.length);
}
}
}
setExtra();
}
}
/** {@inheritDoc} */
public Date getLastModifiedDate() {
return new Date(getTime());
}
/* (non-Javadoc)
* @see java.lang.Object#equals(java.lang.Object)
*/
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (obj == null || getClass() != obj.getClass()) {
return false;
}
ZipArchiveEntry other = (ZipArchiveEntry) obj;
String myName = getName();
String otherName = other.getName();
if (myName == null) {
if (otherName != null) {
return false;
}
} else if (!myName.equals(otherName)) {
return false;
}
String myComment = getComment();
String otherComment = other.getComment();
if (myComment == null) {
myComment = "";
}
if (otherComment == null) {
otherComment = "";
}
return getTime() == other.getTime()
&& myComment.equals(otherComment)
&& getInternalAttributes() == other.getInternalAttributes()
&& getPlatform() == other.getPlatform()
&& getExternalAttributes() == other.getExternalAttributes()
&& getMethod() == other.getMethod()
&& getSize() == other.getSize()
&& getCrc() == other.getCrc()
&& getCompressedSize() == other.getCompressedSize()
&& Arrays.equals(getCentralDirectoryExtra(),
other.getCentralDirectoryExtra())
&& Arrays.equals(getLocalFileDataExtra(),
other.getLocalFileDataExtra())
&& gpb.equals(other.gpb);
}
}