org.apache.tools.zip.ZipEntry 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.
*
*/
package org.apache.tools.zip;
import java.io.File;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.Date;
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. Older versions would have thrown an
* exception if any attempt was made to read or write extra data not
* conforming to the recommendation.
*
*/
public class ZipEntry extends java.util.zip.ZipEntry implements Cloneable {
public static final int PLATFORM_UNIX = 3;
public static final int PLATFORM_FAT = 0;
public static final int CRC_UNKNOWN = -1;
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.
*/
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 = -1;
private int internalAttributes = 0;
private int platform = PLATFORM_FAT;
private long externalAttributes = 0;
private ZipExtraField[] extraFields;
private UnparseableExtraFieldData unparseableExtra = null;
private String name = null;
private byte[] rawName = null;
private GeneralPurposeBit gpb = new GeneralPurposeBit();
private static final ZipExtraField[] noExtraFields = new ZipExtraField[0];
/**
* 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
* @since 1.1
*/
public ZipEntry(final 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
* @since 1.1
* @throws ZipException on error
*/
public ZipEntry(final java.util.zip.ZipEntry entry) throws ZipException {
super(entry);
setName(entry.getName());
final 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
* @since 1.1
*/
public ZipEntry(final ZipEntry entry) throws ZipException {
this((java.util.zip.ZipEntry) entry);
setInternalAttributes(entry.getInternalAttributes());
setExternalAttributes(entry.getExternalAttributes());
setExtraFields(getAllExtraFieldsNoCopy());
setPlatform(entry.getPlatform());
GeneralPurposeBit other = entry.getGeneralPurposeBit();
setGeneralPurposeBit(other == null ? null :
(GeneralPurposeBit) other.clone());
}
/**
* @since 1.9
*/
protected ZipEntry() {
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 ZipEntry(final File inputFile, final 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 ZipEntry
* @since 1.1
*/
@Override
public Object clone() {
final ZipEntry e = (ZipEntry) super.clone();
e.setInternalAttributes(getInternalAttributes());
e.setExternalAttributes(getExternalAttributes());
e.setExtraFields(getAllExtraFieldsNoCopy());
return e;
}
/**
* Returns the compression method of this entry, or -1 if the
* compression method has not been specified.
*
* @return compression method
*/
@Override
public int getMethod() {
return method;
}
/**
* Sets the compression method of this entry.
*
* @param method compression method
*/
@Override
public void setMethod(final 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
* @since 1.1
*/
public int getInternalAttributes() {
return internalAttributes;
}
/**
* Sets the internal file attributes.
* @param value an int value
* @since 1.1
*/
public void setInternalAttributes(final int value) {
internalAttributes = value;
}
/**
* Retrieves the external file attributes.
* @return the external file attributes
* @since 1.1
*/
public long getExternalAttributes() {
return externalAttributes;
}
/**
* Sets the external file attributes.
* @param value an long value
* @since 1.1
*/
public void setExternalAttributes(final long value) {
externalAttributes = value;
}
/**
* Sets Unix permissions in a way that is understood by Info-Zip's
* unzip command.
* @param mode an int value
* @since Ant 1.5.2
*/
public void setUnixMode(final 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
* @since Ant 1.6
*/
public int getUnixMode() {
return platform != PLATFORM_UNIX ? 0 :
(int) ((getExternalAttributes() >> SHORT_SHIFT) & SHORT_MASK);
}
/**
* 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.
*
* @since Ant 1.5.2
*/
public int getPlatform() {
return platform;
}
/**
* Set the platform (UNIX or FAT).
* @param platform an int value - 0 is FAT, 3 is UNIX
* @since 1.9
*/
protected void setPlatform(final int platform) {
this.platform = platform;
}
/**
* Replaces all currently attached extra fields with the new array.
* @param fields an array of extra fields
* @since 1.1
*/
public void setExtraFields(final ZipExtraField[] fields) {
List newFields = new ArrayList();
for (ZipExtraField field : fields) {
if (field instanceof UnparseableExtraFieldData) {
unparseableExtra = (UnparseableExtraFieldData) field;
} else {
newFields.add( field);
}
}
extraFields = newFields.toArray(new ZipExtraField[newFields.size()]);
setExtra();
}
/**
* Retrieves all extra fields that have been parsed successfully.
* @return an array of the extra fields
*/
public ZipExtraField[] getExtraFields() {
return getParseableExtraFields();
}
/**
* 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(final boolean includeUnparseable) {
return includeUnparseable ?
getAllExtraFields() :
getParseableExtraFields();
}
private ZipExtraField[] getParseableExtraFieldsNoCopy() {
if (extraFields == null) {
return noExtraFields;
}
return extraFields;
}
private ZipExtraField[] getParseableExtraFields() {
final ZipExtraField[] parseableExtraFields = getParseableExtraFieldsNoCopy();
return (parseableExtraFields == extraFields)
? copyOf(parseableExtraFields) : parseableExtraFields;
}
private ZipExtraField[] copyOf(ZipExtraField[] src){
return copyOf(src, src.length);
}
private ZipExtraField[] copyOf(ZipExtraField[] src, int length){
ZipExtraField[] cpy = new ZipExtraField[length];
System.arraycopy(src, 0, cpy, 0, Math.min(src.length, length));
return cpy;
}
private ZipExtraField[] getMergedFields() {
final ZipExtraField[] zipExtraFields =
copyOf(extraFields, extraFields.length + 1);
zipExtraFields[extraFields.length] = unparseableExtra;
return zipExtraFields;
}
private ZipExtraField[] getUnparseableOnly() {
return unparseableExtra == null
? noExtraFields : new ZipExtraField[] { unparseableExtra };
}
private ZipExtraField[] getAllExtraFields() {
final ZipExtraField[] allExtraFieldsNoCopy = getAllExtraFieldsNoCopy();
return (allExtraFieldsNoCopy == extraFields)
? copyOf(allExtraFieldsNoCopy) : allExtraFieldsNoCopy;
}
/**
* Get all extra fields, including unparseable ones.
* @return An array of all extra fields. Not necessarily a copy of internal data structures, hence private method
*/
private ZipExtraField[] getAllExtraFieldsNoCopy() {
if (extraFields == null) {
return getUnparseableOnly();
}
return unparseableExtra != null ? getMergedFields() : extraFields;
}
/**
* 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
* @since 1.1
*/
public void addExtraField(final ZipExtraField ze) {
if (ze instanceof UnparseableExtraFieldData) {
unparseableExtra = (UnparseableExtraFieldData) ze;
} else {
if (extraFields == null) {
extraFields = new ZipExtraField[] {ze};
} else {
if (getExtraField(ze.getHeaderId()) != null){
removeExtraField(ze.getHeaderId());
}
final ZipExtraField[] zipExtraFields =
copyOf(extraFields, extraFields.length + 1);
zipExtraFields[extraFields.length] = ze;
extraFields = zipExtraFields;
}
}
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
* @since 1.1
*/
public void addAsFirstExtraField(final ZipExtraField ze) {
if (ze instanceof UnparseableExtraFieldData) {
unparseableExtra = (UnparseableExtraFieldData) ze;
} else {
if (getExtraField(ze.getHeaderId()) != null){
removeExtraField(ze.getHeaderId());
}
ZipExtraField[] copy = extraFields;
int newLen = extraFields != null ? extraFields.length + 1: 1;
extraFields = new ZipExtraField[newLen];
extraFields[0] = ze;
if (copy != null){
System.arraycopy(copy, 0, extraFields, 1, extraFields.length - 1);
}
}
setExtra();
}
/**
* Remove an extra field.
* @param type the type of extra field to remove
* @since 1.1
*/
public void removeExtraField(final ZipShort type) {
if (extraFields == null) {
throw new java.util.NoSuchElementException();
}
List newResult = new ArrayList();
for (ZipExtraField extraField : extraFields) {
if (!type.equals(extraField.getHeaderId())){
newResult.add(extraField);
}
}
if (extraFields.length == newResult.size()) {
throw new java.util.NoSuchElementException();
}
extraFields = newResult.toArray(new ZipExtraField[newResult.size()]);
setExtra();
}
/**
* Removes unparseable extra field data.
*/
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(final ZipShort type) {
if (extraFields != null) {
for (ZipExtraField extraField : extraFields) {
if (type.equals(extraField.getHeaderId())) {
return extraField;
}
}
}
return null;
}
/**
* Looks up extra field data that couldn't be parsed correctly.
*
* @return null if no such field exists.
*/
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
* @since 1.1
* @throws RuntimeException on error
*/
@Override
public void setExtra(final byte[] extra) throws RuntimeException {
try {
final ZipExtraField[] local =
ExtraFieldUtils.parse(extra, true,
ExtraFieldUtils.UnparseableExtraField.READ);
mergeExtraFields(local, true);
} catch (final ZipException e) {
// actually this is not be possible as of Ant 1.8.1
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.
*
* @since 1.1
*/
protected void setExtra() {
super.setExtra(ExtraFieldUtils.mergeLocalFileDataData(getExtraFields(true)));
}
/**
* Sets the central directory part of extra fields.
*/
public void setCentralDirectoryExtra(final byte[] b) {
try {
final ZipExtraField[] central =
ExtraFieldUtils.parse(b, false,
ExtraFieldUtils.UnparseableExtraField.READ);
mergeExtraFields(central, false);
} catch (final ZipException e) {
throw new RuntimeException(e.getMessage(), e);
}
}
/**
* Retrieves the extra data for the local file data.
* @return the extra data for local file
* @since 1.1
*/
public byte[] getLocalFileDataExtra() {
final byte[] extra = getExtra();
return extra != null ? extra : EMPTY;
}
/**
* Retrieves the extra data for the central directory.
* @return the central directory extra data
* @since 1.1
*/
public byte[] getCentralDirectoryExtra() {
return ExtraFieldUtils.mergeCentralDirectoryData(getExtraFields(true));
}
/**
* Make this class work in JDK 1.1 like a 1.2 class.
*
* This either stores the size for later usage or invokes
* setCompressedSize via reflection.
* @param size the size to use
* @deprecated since 1.7.
* Use setCompressedSize directly.
* @since 1.2
*/
@Deprecated
public void setComprSize(final long size) {
setCompressedSize(size);
}
/**
* Get the name of the entry.
* @return the entry name
* @since 1.9
*/
@Override
public String getName() {
return name == null ? super.getName() : name;
}
/**
* Is this entry a directory?
* @return true if the entry is a directory
* @since 1.10
*/
@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(final 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
*/
protected void setName(final String name, final 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.
*/
public byte[] getRawName() {
if (rawName != null) {
final 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.
* @since Ant 1.7
*/
@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.
*/
public GeneralPurposeBit getGeneralPurposeBit() {
return gpb;
}
/**
* The "general purpose bit" field.
*/
public void setGeneralPurposeBit(final 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(final ZipExtraField[] f, final boolean local)
throws ZipException {
if (extraFields == null) {
setExtraFields(f);
} else {
for (final ZipExtraField element : f) {
ZipExtraField existing;
if (element instanceof UnparseableExtraFieldData) {
existing = unparseableExtra;
} else {
existing = getExtraField(element.getHeaderId());
}
if (existing == null) {
addExtraField(element);
} else {
if (local
|| !(existing
instanceof CentralDirectoryParsingZipExtraField)) {
final byte[] b = element.getLocalFileDataData();
existing.parseFromLocalFileData(b, 0, b.length);
} else {
final byte[] b = element.getCentralDirectoryData();
((CentralDirectoryParsingZipExtraField) 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(final Object obj) {
if (this == obj) {
return true;
}
if (obj == null || getClass() != obj.getClass()) {
return false;
}
final ZipEntry other = (ZipEntry) obj;
final String myName = getName();
final 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);
}
}