Java example source code file (ZipUtils.java)
The ZipUtils.java Java example source code/*
* Copyright (c) 2009, 2011, Oracle and/or its affiliates. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* - Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
*
* - Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* - Neither the name of Oracle nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
* IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/*
* This source code is provided to illustrate the usage of a given feature
* or technique and has been deliberately simplified. Additional steps
* required for a production-quality application, such as security checks,
* input validation and proper error handling, might not be present in
* this sample code.
*/
package com.sun.nio.zipfs;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Arrays;
import java.util.Date;
import java.util.regex.PatternSyntaxException;
import java.util.concurrent.TimeUnit;
/**
*
* @author Xueming Shen
*/
class ZipUtils {
/*
* 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) {
Date d = new Date((int)(((dtime >> 25) & 0x7f) + 80),
(int)(((dtime >> 21) & 0x0f) - 1),
(int)((dtime >> 16) & 0x1f),
(int)((dtime >> 11) & 0x1f),
(int)((dtime >> 5) & 0x3f),
(int)((dtime << 1) & 0x3e));
return d.getTime();
}
/*
* Converts Java time to DOS time.
*/
public static long javaToDosTime(long time) {
Date d = new Date(time);
int year = d.getYear() + 1900;
if (year < 1980) {
return (1 << 21) | (1 << 16);
}
return (year - 1980) << 25 | (d.getMonth() + 1) << 21 |
d.getDate() << 16 | d.getHours() << 11 | d.getMinutes() << 5 |
d.getSeconds() >> 1;
}
// 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",
globPattern, i - 1);
}
regex.append("(?:(?:");
inGroup = true;
break;
case '}':
if (inGroup) {
regex.append("))");
inGroup = false;
} else {
regex.append('}');
}
break;
case ',':
if (inGroup) {
regex.append(")|(?:");
} else {
regex.append(',');
}
break;
case '*':
if (next(globPattern, i) == '*') {
// crosses directory boundaries
regex.append(".*");
i++;
} else {
// within directory boundary
regex.append("[^/]*");
}
break;
case '?':
regex.append("[^/]");
break;
default:
if (isRegexMeta(c)) {
regex.append('\\');
}
regex.append(c);
}
}
if (inGroup) {
throw new PatternSyntaxException("Missing '}", globPattern, i - 1);
}
return regex.append('$').toString();
}
}
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