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Provides basic functionality for reading and writing ZIP files.
/*
* Copyright (C) 2005-2015 Schlichtherle IT Services.
* All rights reserved. Use is subject to license terms.
*/
package net.java.truevfs.comp.zip;
import java.nio.charset.Charset;
import net.java.truecommons.io.Streams;
/**
* A package private class with some constants for ZIP files.
*
* @author Christian Schlichtherle
*/
final class Constants {
/**
* This boolean field is set by the system property
* {@code net.java.truevfs.comp.zip.forceZip64Ext}.
* If this property is set to {@code true} (case is ignored),
* then ZIP64 extensions are always added when writing a ZIP file,
* regardless of its size.
* This system property is intended for testing purposes only.
* During normal operations, it should not be set as many
* third party tools would not treat the redundant ZIP64 extensions
* correctly.
* Note that it's impossible to inhibit ZIP64 extensions if they are
* required.
*/
static final boolean FORCE_ZIP64_EXT = Boolean.getBoolean(
Constants.class.getPackage().getName() + ".forceZip64Ext");
/** Local File Header signature. */
static final int LFH_SIG = 0x04034B50;
/** Data Descriptor signature. */
static final int DD_SIG = 0x08074B50;
/** Central File Header signature. */
static final int CFH_SIG = 0x02014B50;
/** Zip64 End Of Central Directory Record. */
static final int ZIP64_EOCDR_SIG = 0x06064B50;
/** Zip64 End Of Central Directory Locator. */
static final int ZIP64_EOCDL_SIG = 0x07064B50;
/** End Of Central Directory Record signature. */
static final int EOCDR_SIG = 0x06054B50;
/** The minimum length of the Local File Header record. */
static final int LFH_MIN_LEN =
/* local file header signature */ 4 +
/* version needed to extract */ 2 +
/* general purpose bit flag */ 2 +
/* compression method */ 2 +
/* last mod file time */ 2 +
/* last mod file date */ 2 +
/* crc-32 */ 4 +
/* compressed size */ 4 +
/* uncompressed size */ 4 +
/* file name length */ 2 +
/* extra field length */ 2;
/** The minimum length of the Central File Header record. */
static final int CFH_MIN_LEN =
/* central file header signature */ 4 +
/* version made by */ 2 +
/* version needed to extract */ 2 +
/* general purpose bit flag */ 2 +
/* compression method */ 2 +
/* last mod file time */ 2 +
/* last mod file date */ 2 +
/* crc-32 */ 4 +
/* compressed size */ 4 +
/* uncompressed size */ 4 +
/* file name length */ 2 +
/* extra field length */ 2 +
/* file comment length */ 2 +
/* disk number start */ 2 +
/* internal file attributes */ 2 +
/* external file attributes */ 4 +
/* relative offset of local header */ 4;
/** The minimum length of the End Of Central Directory Record. */
static final int EOCDR_MIN_LEN =
/* end of central dir signature */ 4 +
/* number of this disk */ 2 +
/* number of the disk with the */
/* start of the central directory */ 2 +
/* total number of entries in the */
/* central directory on this disk */ 2 +
/* total number of entries in */
/* the central directory */ 2 +
/* size of the central directory */ 4 +
/* offset of start of central */
/* directory with respect to */
/* the starting disk number */ 4 +
/* zipfile comment length */ 2;
/** The minimum length of the Zip64 End Of Central Directory Record. */
static final int ZIP64_EOCDR_MIN_LEN =
/* zip64 end of central dir */
/* signature */ 4 +
/* size of zip64 end of central */
/* directory record */ 8 +
/* version made by */ 2 +
/* version needed to extract */ 2 +
/* number of this disk */ 4 +
/* number of the disk with the */
/* start of the central directory */ 4 +
/* total number of entries in the */
/* central directory on this disk */ 8 +
/* total number of entries in */
/* the central directory */ 8 +
/* size of the central directory */ 8 +
/* offset of start of central */
/* directory with respect to */
/* the starting disk number */ 8;
/** The length of the Zip64 End Of Central Directory Locator. */
static final int ZIP64_EOCDL_LEN =
/* zip64 end of central dir locator*/
/* signature */ 4 +
/* number of the disk with the */
/* start of the zip64 end of */
/* central directory */ 4 +
/* relative offset of the zip64 */
/* end of central directory record */ 8 +
/* total number of disks */ 4;
static final Charset UTF8 = Charset.forName("UTF-8");
/**
* The default character set used for entry names and comments in ZIP
* archive files.
* This is {@code "UTF-8"} for compatibility with Sun's JDK implementation.
* Note that you should use "IBM437" for ordinary ZIP archive
* files instead.
*/
static final Charset DEFAULT_CHARSET = UTF8;
/**
* The maximum buffer size used for deflating and inflating.
* Optimized for performance.
*/
static final int MAX_FLATER_BUF_LENGTH = Streams.BUFFER_SIZE;
/**
* The minimum buffer size used for deflating and inflating.
* Optimized for performance.
*/
static final int MIN_FLATER_BUF_LENGTH = MAX_FLATER_BUF_LENGTH / 8;
/** An empty byte array. */
static final byte[] EMPTY = new byte[0];
private Constants() { }
}
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