com.facebook.presto.druid.zip

Class ZipUtil

java.lang.Object

com.facebook.presto.druid.zip.ZipUtil

public class ZipUtil
extends Object

A utility class for reading and writing ZipFileEntrys from byte arrays.

Field Summary

Fields

Modifier and Type	Field and Description
static long	DOS_EPOCH Midnight Jan 1st 1980.
static long	MAX_DOS_DATE 23:59:59 Dec 31st 2107.

Method Summary

Modifier and Type	Method and Description
static boolean	arrayStartsWith(byte[] array, byte[] target)
static long	dosToUnixTime(int timestamp) Converts a 32-bit DOS timestamp into a unix timestamp.
static short	get16(byte[] source, int offset)
static int	get32(byte[] source, int offset)
static long	get64(byte[] source, int offset)
static long	getUnsignedInt(byte[] source, int offset)
static long	getUnsignedLong(byte[] source, int offset)
static int	getUnsignedShort(byte[] source, int offset)
static byte[]	intToLittleEndian(byte[] buf, int offset, int value)
static byte[]	intToLittleEndian(int value)
static boolean	isValidInDos(long timeMillis) Checks if the unix timestamp is representable as a valid DOS timestamp.
static byte[]	longToLittleEndian(byte[] buf, int offset, long value)
static byte[]	longToLittleEndian(long value)
static byte[]	shortToLittleEndian(byte[] buf, int offset, short value)
static byte[]	shortToLittleEndian(short value)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

DOS_EPOCH

public static final long DOS_EPOCH

Midnight Jan 1st 1980. Uses the current time zone as the DOS format does not support time zones and will always assume the current zone.

MAX_DOS_DATE

public static final long MAX_DOS_DATE

23:59:59 Dec 31st 2107. The maximum date representable in DOS format.

Method Detail

shortToLittleEndian

public static byte[] shortToLittleEndian(short value)

shortToLittleEndian

public static byte[] shortToLittleEndian(byte[] buf,
                                         int offset,
                                         short value)

intToLittleEndian

public static byte[] intToLittleEndian(int value)

intToLittleEndian

public static byte[] intToLittleEndian(byte[] buf,
                                       int offset,
                                       int value)

longToLittleEndian

public static byte[] longToLittleEndian(long value)

longToLittleEndian

public static byte[] longToLittleEndian(byte[] buf,
                                        int offset,
                                        long value)

get16

public static short get16(byte[] source,
                          int offset)

get32

public static int get32(byte[] source,
                        int offset)

get64

public static long get64(byte[] source,
                         int offset)

getUnsignedShort

public static int getUnsignedShort(byte[] source,
                                   int offset)

getUnsignedInt

public static long getUnsignedInt(byte[] source,
                                  int offset)

getUnsignedLong

public static long getUnsignedLong(byte[] source,
                                   int offset)
                            throws ZipException

Throws:

ZipException

isValidInDos

public static boolean isValidInDos(long timeMillis)

Checks if the unix timestamp is representable as a valid DOS timestamp.

See ZIP Format for a general description of the date a time fields (Section 4.4.6) and DOS date format for a detailed description of the format.

dosToUnixTime

public static long dosToUnixTime(int timestamp)

Converts a 32-bit DOS timestamp into a unix timestamp.

arrayStartsWith

public static boolean arrayStartsWith(byte[] array,
                                      byte[] target)