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298 lines (258 loc) · 12.9 KB
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/*
* Copyright (c) 2013, 2025, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package java.util.zip;
import java.nio.ByteBuffer;
import java.nio.file.attribute.FileTime;
import java.time.DateTimeException;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.Date;
import java.util.concurrent.TimeUnit;
import static java.util.zip.ZipConstants.ENDHDR;
import jdk.internal.access.JavaNioAccess;
import jdk.internal.access.SharedSecrets;
import jdk.internal.misc.Unsafe;
import jdk.internal.util.Preconditions;
class ZipUtils {
static final JavaNioAccess NIO_ACCESS = SharedSecrets.getJavaNioAccess();
// used to adjust values between Windows and java epoch
private static final long WINDOWS_EPOCH_IN_MICROSECONDS = -11644473600000000L;
// used to indicate the corresponding windows time is not available
public static final long WINDOWS_TIME_NOT_AVAILABLE = Long.MIN_VALUE;
// static final ByteBuffer defaultBuf = ByteBuffer.allocateDirect(0);
static final ByteBuffer defaultBuf = ByteBuffer.allocate(0);
/**
* Converts Windows time (in microseconds, UTC/GMT) time to FileTime.
*/
public static final FileTime winTimeToFileTime(long wtime) {
return FileTime.from(wtime / 10 + WINDOWS_EPOCH_IN_MICROSECONDS,
TimeUnit.MICROSECONDS);
}
/**
* Converts FileTime to Windows time.
*/
public static final long fileTimeToWinTime(FileTime ftime) {
return (ftime.to(TimeUnit.MICROSECONDS) - WINDOWS_EPOCH_IN_MICROSECONDS) * 10;
}
/**
* The upper bound of the 32-bit unix time, the "year 2038 problem".
*/
public static final long UPPER_UNIXTIME_BOUND = 0x7fffffff;
/**
* Converts "standard Unix time"(in seconds, UTC/GMT) to FileTime
*/
public static final FileTime unixTimeToFileTime(long utime) {
return FileTime.from(utime, TimeUnit.SECONDS);
}
/**
* Converts FileTime to "standard Unix time".
*/
public static final long fileTimeToUnixTime(FileTime ftime) {
return ftime.to(TimeUnit.SECONDS);
}
/**
* Converts DOS time to Java time (number of milliseconds since epoch).
*/
public static long dosToJavaTime(long dtime) {
int year = (int) (((dtime >> 25) & 0x7f) + 1980);
int month = (int) ((dtime >> 21) & 0x0f);
int day = (int) ((dtime >> 16) & 0x1f);
int hour = (int) ((dtime >> 11) & 0x1f);
int minute = (int) ((dtime >> 5) & 0x3f);
int second = (int) ((dtime << 1) & 0x3e);
if (month > 0 && month < 13 && day > 0 && hour < 24 && minute < 60 && second < 60) {
try {
LocalDateTime ldt = LocalDateTime.of(year, month, day, hour, minute, second);
return TimeUnit.SECONDS.toMillis(ldt.toEpochSecond(
ZoneId.systemDefault().getRules().getOffset(ldt)));
} catch (DateTimeException dte) {
// ignore
}
}
return overflowDosToJavaTime(year, month, day, hour, minute, second);
}
/*
* Deal with corner cases where an arguably mal-formed DOS time is used
*/
@SuppressWarnings("deprecation") // Use of Date constructor
private static long overflowDosToJavaTime(int year, int month, int day,
int hour, int minute, int second) {
return new Date(year - 1900, month - 1, day, hour, minute, second).getTime();
}
/**
* Converts extended DOS time to Java time, where up to 1999 milliseconds
* might be encoded into the upper half of the returned long.
*
* @param xdostime the extended DOS time value
* @return milliseconds since epoch
*/
public static long extendedDosToJavaTime(long xdostime) {
long time = dosToJavaTime(xdostime);
return time + (xdostime >> 32);
}
/**
* Converts Java time to DOS time.
*/
private static long javaToDosTime(LocalDateTime ldt) {
int year = ldt.getYear() - 1980;
return (year << 25 |
ldt.getMonthValue() << 21 |
ldt.getDayOfMonth() << 16 |
ldt.getHour() << 11 |
ldt.getMinute() << 5 |
ldt.getSecond() >> 1) & 0xffffffffL;
}
/**
* Converts Java time to DOS time, encoding any milliseconds lost
* in the conversion into the upper half of the returned long.
*
* @param time milliseconds since epoch
* @return DOS time with 2s remainder encoded into upper half
*/
static long javaToExtendedDosTime(long time) {
LocalDateTime ldt = javaEpochToLocalDateTime(time);
if (ldt.getYear() >= 1980) {
return javaToDosTime(ldt) + ((time % 2000) << 32);
}
return ZipEntry.DOSTIME_BEFORE_1980;
}
static LocalDateTime javaEpochToLocalDateTime(long time) {
Instant instant = Instant.ofEpochMilli(time);
return LocalDateTime.ofInstant(instant, ZoneId.systemDefault());
}
/**
* Fetches unsigned 16-bit value from byte array at specified offset.
* The bytes are assumed to be in Intel (little-endian) byte order.
*/
public static final int get16(byte[] b, int off) {
Preconditions.checkIndex(off, b.length, Preconditions.AIOOBE_FORMATTER);
Preconditions.checkIndex(off + 1, b.length, Preconditions.AIOOBE_FORMATTER);
return Short.toUnsignedInt(
UNSAFE.getShortUnaligned(b, off + Unsafe.ARRAY_BYTE_BASE_OFFSET, false));
}
/**
* Fetches unsigned 32-bit value from byte array at specified offset.
* The bytes are assumed to be in Intel (little-endian) byte order.
*/
public static final long get32(byte[] b, int off) {
Preconditions.checkIndex(off, b.length, Preconditions.AIOOBE_FORMATTER);
Preconditions.checkIndex(off + 3, b.length, Preconditions.AIOOBE_FORMATTER);
return Integer.toUnsignedLong(
UNSAFE.getIntUnaligned(b, off + Unsafe.ARRAY_BYTE_BASE_OFFSET, false));
}
/**
* Fetches signed 64-bit value from byte array at specified offset.
* The bytes are assumed to be in Intel (little-endian) byte order.
*/
public static final long get64S(byte[] b, int off) {
Preconditions.checkIndex(off, b.length, Preconditions.AIOOBE_FORMATTER);
Preconditions.checkIndex(off + 7, b.length, Preconditions.AIOOBE_FORMATTER);
return UNSAFE.getLongUnaligned(b, off + Unsafe.ARRAY_BYTE_BASE_OFFSET, false);
}
/**
* Fetches signed 32-bit value from byte array at specified offset.
* The bytes are assumed to be in Intel (little-endian) byte order.
*
*/
public static final int get32S(byte[] b, int off) {
Preconditions.checkIndex(off, b.length, Preconditions.AIOOBE_FORMATTER);
Preconditions.checkIndex(off + 3, b.length, Preconditions.AIOOBE_FORMATTER);
return UNSAFE.getIntUnaligned(b, off + Unsafe.ARRAY_BYTE_BASE_OFFSET, false);
}
/*
* File attribute compatibility types of CEN field "version made by"
*/
static final int FILE_ATTRIBUTES_UNIX = 3; // Unix
/*
* Base values for CEN field "version made by"
*/
static final int VERSION_MADE_BY_BASE_UNIX = FILE_ATTRIBUTES_UNIX << 8; // Unix
// local file (LOC) header fields
static final long LOCSIG(byte[] b) { return get32(b, 0); } // signature
static final int LOCVER(byte[] b) { return get16(b, 4); } // version needed to extract
static final int LOCFLG(byte[] b) { return get16(b, 6); } // general purpose bit flags
static final int LOCHOW(byte[] b) { return get16(b, 8); } // compression method
static final long LOCTIM(byte[] b) { return get32(b, 10);} // modification time
static final long LOCCRC(byte[] b) { return get32(b, 14);} // crc of uncompressed data
static final long LOCSIZ(byte[] b) { return get32(b, 18);} // compressed data size
static final long LOCLEN(byte[] b) { return get32(b, 22);} // uncompressed data size
static final int LOCNAM(byte[] b) { return get16(b, 26);} // filename length
static final int LOCEXT(byte[] b) { return get16(b, 28);} // extra field length
// extra local (EXT) header fields
static final long EXTCRC(byte[] b) { return get32(b, 4);} // crc of uncompressed data
static final long EXTSIZ(byte[] b) { return get32(b, 8);} // compressed size
static final long EXTLEN(byte[] b) { return get32(b, 12);} // uncompressed size
// end of central directory header (END) fields
static final int ENDSUB(byte[] b) { return get16(b, 8); } // number of entries on this disk
static final int ENDTOT(byte[] b) { return get16(b, 10);} // total number of entries
static final long ENDSIZ(byte[] b) { return get32(b, 12);} // central directory size
static final long ENDOFF(byte[] b) { return get32(b, 16);} // central directory offset
static final int ENDCOM(byte[] b) { return get16(b, 20);} // size of ZIP file comment
static final int ENDCOM(byte[] b, int off) { return get16(b, off + 20);}
// zip64 end of central directory record fields
static final long ZIP64_ENDTOD(byte[] b) { return get64S(b, 24);} // total number of entries on disk
static final long ZIP64_ENDTOT(byte[] b) { return get64S(b, 32);} // total number of entries
static final long ZIP64_ENDSIZ(byte[] b) { return get64S(b, 40);} // central directory size
static final long ZIP64_ENDOFF(byte[] b) { return get64S(b, 48);} // central directory offset
static final long ZIP64_LOCOFF(byte[] b) { return get64S(b, 8);} // zip64 end offset
// central directory header (CEN) fields
static final long CENSIG(byte[] b, int pos) { return get32(b, pos + 0); }
static final int CENVEM(byte[] b, int pos) { return get16(b, pos + 4); }
static final int CENVEM_FA(byte[] b, int pos) { return Byte.toUnsignedInt(b[pos + 5]); } // file attribute compatibility
static final int CENVER(byte[] b, int pos) { return get16(b, pos + 6); }
static final int CENFLG(byte[] b, int pos) { return get16(b, pos + 8); }
static final int CENHOW(byte[] b, int pos) { return get16(b, pos + 10);}
static final long CENTIM(byte[] b, int pos) { return get32(b, pos + 12);}
static final long CENCRC(byte[] b, int pos) { return get32(b, pos + 16);}
static final long CENSIZ(byte[] b, int pos) { return get32(b, pos + 20);}
static final long CENLEN(byte[] b, int pos) { return get32(b, pos + 24);}
static final int CENNAM(byte[] b, int pos) { return get16(b, pos + 28);}
static final int CENEXT(byte[] b, int pos) { return get16(b, pos + 30);}
static final int CENCOM(byte[] b, int pos) { return get16(b, pos + 32);}
static final int CENDSK(byte[] b, int pos) { return get16(b, pos + 34);}
static final int CENATT(byte[] b, int pos) { return get16(b, pos + 36);}
static final long CENATX(byte[] b, int pos) { return get32(b, pos + 38);}
static final int CENATX_PERMS(byte[] b, int pos) { return get16(b, pos + 40);} // posix permission data
static final long CENOFF(byte[] b, int pos) { return get32(b, pos + 42);}
// The END header is followed by a variable length comment of size < 64k.
static final long END_MAXLEN = 0xFFFF + ENDHDR;
static final int READBLOCKSZ = 128;
/**
* Loads ZIP native library, if not already loaded
*/
static void loadLibrary() {
jdk.internal.loader.BootLoader.loadLibrary("zip");
}
private static final Unsafe UNSAFE = Unsafe.getUnsafe();
private static final long byteBufferArrayOffset = UNSAFE.objectFieldOffset(ByteBuffer.class, "hb");
private static final long byteBufferOffsetOffset = UNSAFE.objectFieldOffset(ByteBuffer.class, "offset");
static byte[] getBufferArray(ByteBuffer byteBuffer) {
return (byte[]) UNSAFE.getReference(byteBuffer, byteBufferArrayOffset);
}
static int getBufferOffset(ByteBuffer byteBuffer) {
return UNSAFE.getInt(byteBuffer, byteBufferOffsetOffset);
}
}