JDK14/Java14源码在线阅读
/*
* Copyright (c) 2009, 2019, 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
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*/
package jdk.nio.zipfs;
import java.io.IOException;
import java.io.OutputStream;
import java.nio.file.attribute.PosixFilePermission;
import java.time.DateTimeException;
import java.time.Instant;
import java.time.LocalDateTime;
import java.time.ZoneId;
import java.util.Arrays;
import java.util.Date;
import java.util.Set;
import java.util.concurrent.TimeUnit;
import java.util.regex.PatternSyntaxException;
/**
* @author Xueming Shen
*/
class ZipUtils {
/**
* The bit flag used to specify read permission by the owner.
*/
static final int POSIX_USER_READ = 0400;
/**
* The bit flag used to specify write permission by the owner.
*/
static final int POSIX_USER_WRITE = 0200;
/**
* The bit flag used to specify execute permission by the owner.
*/
static final int POSIX_USER_EXECUTE = 0100;
/**
* The bit flag used to specify read permission by the group.
*/
static final int POSIX_GROUP_READ = 040;
/**
* The bit flag used to specify write permission by the group.
*/
static final int POSIX_GROUP_WRITE = 020;
/**
* The bit flag used to specify execute permission by the group.
*/
static final int POSIX_GROUP_EXECUTE = 010;
/**
* The bit flag used to specify read permission by others.
*/
static final int POSIX_OTHER_READ = 04;
/**
* The bit flag used to specify write permission by others.
*/
static final int POSIX_OTHER_WRITE = 02;
/**
* The bit flag used to specify execute permission by others.
*/
static final int POSIX_OTHER_EXECUTE = 01;
/**
* Convert a {@link PosixFilePermission} object into the appropriate bit
* flag.
*
* @param perm The {@link PosixFilePermission} object.
* @return The bit flag as int.
*/
static int permToFlag(PosixFilePermission perm) {
switch(perm) {
case OWNER_READ:
return POSIX_USER_READ;
case OWNER_WRITE:
return POSIX_USER_WRITE;
case OWNER_EXECUTE:
return POSIX_USER_EXECUTE;
case GROUP_READ:
return POSIX_GROUP_READ;
case GROUP_WRITE:
return POSIX_GROUP_WRITE;
case GROUP_EXECUTE:
return POSIX_GROUP_EXECUTE;
case OTHERS_READ:
return POSIX_OTHER_READ;
case OTHERS_WRITE:
return POSIX_OTHER_WRITE;
case OTHERS_EXECUTE:
return POSIX_OTHER_EXECUTE;
default:
return 0;
}
}
/**
* Converts a set of {@link PosixFilePermission}s into an int value where
* the according bits are set.
*
* @param perms A Set of {@link PosixFilePermission} objects.
*
* @return A bit mask representing the input Set.
*/
static int permsToFlags(Set<PosixFilePermission> perms) {
if (perms == null) {
return -1;
}
int flags = 0;
for (PosixFilePermission perm : perms) {
flags |= permToFlag(perm);
}
return flags;
}
/*
* Writes a 16-bit short to the output stream in little-endian byte order.
*/
public static void writeShort(OutputStream os, int v) throws IOException {
os.write(v & 0xff);
os.write((v >>> 8) & 0xff);
}
/*
* Writes a 32-bit int to the output stream in little-endian byte order.
*/
public static void writeInt(OutputStream os, long v) throws IOException {
os.write((int)(v & 0xff));
os.write((int)((v >>> 8) & 0xff));
os.write((int)((v >>> 16) & 0xff));
os.write((int)((v >>> 24) & 0xff));
}
/*
* Writes a 64-bit int to the output stream in little-endian byte order.
*/
public static void writeLong(OutputStream os, long v) throws IOException {
os.write((int)(v & 0xff));
os.write((int)((v >>> 8) & 0xff));
os.write((int)((v >>> 16) & 0xff));
os.write((int)((v >>> 24) & 0xff));
os.write((int)((v >>> 32) & 0xff));
os.write((int)((v >>> 40) & 0xff));
os.write((int)((v >>> 48) & 0xff));
os.write((int)((v >>> 56) & 0xff));
}
/*
* Writes an array of bytes to the output stream.
*/
public static void writeBytes(OutputStream os, byte[] b)
throws IOException
{
os.write(b, 0, b.length);
}
/*
* Writes an array of bytes to the output stream.
*/
public static void writeBytes(OutputStream os, byte[] b, int off, int len)
throws IOException
{
os.write(b, off, len);
}
/*
* Append a slash at the end, if it does not have one yet
*/
public static byte[] toDirectoryPath(byte[] dir) {
if (dir.length != 0 && dir[dir.length - 1] != '/') {
dir = Arrays.copyOf(dir, dir.length + 1);
dir[dir.length - 1] = '/';
}
return dir;
}
/*
* 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.MILLISECONDS.convert(ldt.toEpochSecond(
ZoneId.systemDefault().getRules().getOffset(ldt)), TimeUnit.SECONDS);
} 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 Java time to DOS time.
*/
public static long javaToDosTime(long time) {
Instant instant = Instant.ofEpochMilli(time);
LocalDateTime ldt = LocalDateTime.ofInstant(
instant, ZoneId.systemDefault());
int year = ldt.getYear() - 1980;
if (year < 0) {
return (1 << 21) | (1 << 16);
}
return (year << 25 |
ldt.getMonthValue() << 21 |
ldt.getDayOfMonth() << 16 |
ldt.getHour() << 11 |
ldt.getMinute() << 5 |
ldt.getSecond() >> 1) & 0xffffffffL;
}
// used to adjust values between Windows and java epoch
private static final long WINDOWS_EPOCH_IN_MICROSECONDS = -11644473600000000L;
public static final long winToJavaTime(long wtime) {
return TimeUnit.MILLISECONDS.convert(
wtime / 10 + WINDOWS_EPOCH_IN_MICROSECONDS, TimeUnit.MICROSECONDS);
}
public static final long javaToWinTime(long time) {
return (TimeUnit.MICROSECONDS.convert(time, TimeUnit.MILLISECONDS)
- WINDOWS_EPOCH_IN_MICROSECONDS) * 10;
}
public static final long unixToJavaTime(long utime) {
return TimeUnit.MILLISECONDS.convert(utime, TimeUnit.SECONDS);
}
public static final long javaToUnixTime(long time) {
return TimeUnit.SECONDS.convert(time, TimeUnit.MILLISECONDS);
}
private static final String regexMetaChars = ".^$+{[]|()";
private static final String globMetaChars = "\\*?[{";
private static boolean isRegexMeta(char c) {
return regexMetaChars.indexOf(c) != -1;
}
private static boolean isGlobMeta(char c) {
return globMetaChars.indexOf(c) != -1;
}
private static char EOL = 0; //TBD
private static char next(String glob, int i) {
if (i < glob.length()) {
return glob.charAt(i);
}
return EOL;
}
/*
* Creates a regex pattern from the given glob expression.
*
* @throws PatternSyntaxException
*/
public static String toRegexPattern(String globPattern) {
boolean inGroup = false;
StringBuilder regex = new StringBuilder("^");
int i = 0;
while (i < globPattern.length()) {
char c = globPattern.charAt(i++);
switch (c) {
case '\\':
// escape special characters
if (i == globPattern.length()) {
throw new PatternSyntaxException("No character to escape",
globPattern, i - 1);
}
char next = globPattern.charAt(i++);
if (isGlobMeta(next) || isRegexMeta(next)) {
regex.append('\\');
}
regex.append(next);
break;
case '/':
regex.append(c);
break;
case '[':
// don't match name separator in class
regex.append("[[^/]&&[");
if (next(globPattern, i) == '^') {
// escape the regex negation char if it appears
regex.append("\\^");
i++;
} else {
// negation
if (next(globPattern, i) == '!') {
regex.append('^');
i++;
}
// hyphen allowed at start
if (next(globPattern, i) == '-') {
regex.append('-');
i++;
}
}
boolean hasRangeStart = false;
char last = 0;
while (i < globPattern.length()) {
c = globPattern.charAt(i++);
if (c == ']') {
break;
}
if (c == '/') {
throw new PatternSyntaxException("Explicit 'name separator' in class",
globPattern, i - 1);
}
// TBD: how to specify ']' in a class?
if (c == '\\' || c == '[' ||
c == '&' && next(globPattern, i) == '&') {
// escape '\', '[' or "&&" for regex class
regex.append('\\');
}
regex.append(c);
if (c == '-') {
if (!hasRangeStart) {
throw new PatternSyntaxException("Invalid range",
globPattern, i - 1);
}
if ((c = next(globPattern, i++)) == EOL || c == ']') {
break;
}
if (c < last) {
throw new PatternSyntaxException("Invalid range",
globPattern, i - 3);
}
regex.append(c);
hasRangeStart = false;
} else {
hasRangeStart = true;
last = c;
}
}
if (c != ']') {
throw new PatternSyntaxException("Missing ']", globPattern, i - 1);
}
regex.append("]]");
break;
case '{':
if (inGroup) {
throw new PatternSyntaxException("Cannot nest groups",
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