com.zving.preloader.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 com.zving.preloader.zip;
import java.util.ArrayList;
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
* the .ZIP File Format Specification created by PKWARE Inc. :
*
* - 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.
* @see
* .ZIP File Format Specification
*
*/
public class ZipEntry extends java.util.zip.ZipEntry implements Cloneable {
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 int internalAttributes = 0;
private int platform = PLATFORM_FAT;
private long externalAttributes = 0;
private LinkedHashMap/**/ extraFields = null;
private UnparseableExtraFieldData unparseableExtra = null;
private String name = null;
/**
* Creates a new zip entry with the specified name.
* @param name the name of the entry
* @since 1.1
*/
public ZipEntry(String name) {
super(name);
}
/**
* Creates a new zip entry with fields taken from the specified zip entry.
* @param entry the entry to get fields from
* @since 1.1
* @throws ZipException on error
*/
public ZipEntry(java.util.zip.ZipEntry entry) throws ZipException {
super(entry);
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();
}
}
/**
* Creates a new zip entry with fields taken from the specified zip entry.
* @param entry the entry to get fields from
* @throws ZipException on error
* @since 1.1
*/
public ZipEntry(ZipEntry entry) throws ZipException {
this((java.util.zip.ZipEntry) entry);
setInternalAttributes(entry.getInternalAttributes());
setExternalAttributes(entry.getExternalAttributes());
setExtraFields(entry.getExtraFields(true));
}
/**
* @since 1.9
*/
protected ZipEntry() {
super("");
}
/**
* Overwrite clone.
* @return a cloned copy of this ZipEntry
* @since 1.1
*/
public Object clone() {
ZipEntry e = (ZipEntry) super.clone();
e.setInternalAttributes(getInternalAttributes());
e.setExternalAttributes(getExternalAttributes());
e.setExtraFields(getExtraFields(true));
return e;
}
/**
* 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(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(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(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 PLATORM_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(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(ZipExtraField[] fields) {
extraFields = new LinkedHashMap();
for (int i = 0; i < fields.length; i++) {
if (fields[i] instanceof UnparseableExtraFieldData) {
unparseableExtra = (UnparseableExtraFieldData) fields[i];
} else {
extraFields.put(fields[i].getHeaderId(), fields[i]);
}
}
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 (ZipExtraField[]) 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
* @since 1.1
*/
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
* @since 1.1
*/
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
* @since 1.1
*/
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.
*/
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 (ZipExtraField) extraFields.get(type);
}
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
*/
public void setExtra(byte[] extra) throws RuntimeException {
try {
ZipExtraField[] local =
ExtraFieldUtils.parse(extra, true,
ExtraFieldUtils.UnparseableExtraField.READ);
mergeExtraFields(local, true);
} catch (Exception 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(byte[] b) {
try {
ZipExtraField[] central =
ExtraFieldUtils.parse(b, false,
ExtraFieldUtils.UnparseableExtraField.READ);
mergeExtraFields(central, false);
} catch (Exception 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() {
byte[] extra = getExtra();
return extra != null ? extra : new byte[0];
}
/**
* 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
*/
public void setComprSize(long size) {
setCompressedSize(size);
}
/**
* Get the name of the entry.
* @return the entry name
* @since 1.9
*/
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
*/
public boolean isDirectory() {
return getName().endsWith("/");
}
/**
* Set the name of the entry.
* @param name the name to use
*/
protected void setName(String name) {
this.name = name;
}
/**
* Get the hashCode of the entry.
* This uses the name as the hashcode.
* @return a hashcode.
* @since Ant 1.7
*/
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 equality method. In this case, the implementation returns 'this == o'
* which is basically the equals method of the Object class.
* @param o the object to compare to
* @return true if this object is the same as o
* @since Ant 1.7
*/
public boolean equals(Object o) {
return (this == o);
}
/**
* 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 (int i = 0; i < f.length; i++) {
ZipExtraField existing;
if (f[i] instanceof UnparseableExtraFieldData) {
existing = unparseableExtra;
} else {
existing = getExtraField(f[i].getHeaderId());
}
if (existing == null) {
addExtraField(f[i]);
} else {
if (local
|| !(existing
instanceof CentralDirectoryParsingZipExtraField)) {
byte[] b = f[i].getLocalFileDataData();
existing.parseFromLocalFileData(b, 0, b.length);
} else {
byte[] b = f[i].getCentralDirectoryData();
((CentralDirectoryParsingZipExtraField) existing)
.parseFromCentralDirectoryData(b, 0, b.length);
}
}
}
setExtra();
}
}
}