/*
GNU GENERAL LICENSE
Copyright (C) 2006 The Lobo Project. Copyright (C) 2014 - 2017 Lobo Evolution
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public
License as published by the Free Software Foundation; either
verion 3 of the License, or (at your option) any later version.
This program 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 License for more details.
You should have received a copy of the GNU General Public
along with this program. If not, see <http://www.gnu.org/licenses/>.
Contact info: lobochief@users.sourceforge.net; ivan.difrancesco@yahoo.it
*/
/*
* Created on Mar 19, 2005
*/
package org.lobobrowser.util.io;
import java.io.BufferedOutputStream;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.Collection;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
/**
* The Class IORoutines.
*
* @author J. H. S.
*/
public class IORoutines {
/** The Constant LINE_BREAK_BYTES. */
public static final byte[] LINE_BREAK_BYTES = { (byte) 13, (byte) 10 };
/**
* Load as text.
*
* @param in
* the in
* @param encoding
* the encoding
* @return the string
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static String loadAsText(InputStream in, String encoding)
throws IOException {
return loadAsText(in, encoding, 4096);
}
/**
* Load as text.
*
* @param in
* the in
* @param encoding
* the encoding
* @param bufferSize
* the buffer size
* @return the string
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static String loadAsText(InputStream in, String encoding,
int bufferSize) throws IOException {
InputStreamReader reader = new InputStreamReader(in, encoding);
char[] buffer = new char[bufferSize];
int offset = 0;
for (;;) {
int remain = buffer.length - offset;
if (remain <= 0) {
char[] newBuffer = new char[buffer.length * 2];
System.arraycopy(buffer, 0, newBuffer, 0, offset);
buffer = newBuffer;
remain = buffer.length - offset;
}
int numRead = reader.read(buffer, offset, remain);
if (numRead == -1) {
break;
}
offset += numRead;
}
return new String(buffer, 0, offset);
}
/**
* Load.
*
* @param file
* the file
* @return the byte[]
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static byte[] load(File file) throws IOException {
long fileLength = file.length();
if (fileLength > Integer.MAX_VALUE) {
throw new IOException("File '" + file.getName() + "' too big");
}
InputStream in = new FileInputStream(file);
try {
return loadExact(in, (int) fileLength);
} finally {
in.close();
}
}
/**
* Load.
*
* @param in
* the in
* @return the byte[]
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static byte[] load(InputStream in) throws IOException {
return load(in, 4096);
}
/**
* Load.
*
* @param in
* the in
* @param initialBufferSize
* the initial buffer size
* @return the byte[]
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static byte[] load(InputStream in, int initialBufferSize)
throws IOException {
if (initialBufferSize == 0) {
initialBufferSize = 1;
}
byte[] buffer = new byte[initialBufferSize];
int offset = 0;
for (;;) {
int remain = buffer.length - offset;
if (remain <= 0) {
int newSize = buffer.length * 2;
byte[] newBuffer = new byte[newSize];
System.arraycopy(buffer, 0, newBuffer, 0, offset);
buffer = newBuffer;
remain = buffer.length - offset;
}
int numRead = in.read(buffer, offset, remain);
if (numRead == -1) {
break;
}
offset += numRead;
}
if (offset < buffer.length) {
byte[] newBuffer = new byte[offset];
System.arraycopy(buffer, 0, newBuffer, 0, offset);
buffer = newBuffer;
}
return buffer;
}
/**
* Load exact.
*
* @param in
* the in
* @param length
* the length
* @return the byte[]
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static byte[] loadExact(InputStream in, int length)
throws IOException {
byte[] buffer = new byte[length];
int offset = 0;
for (;;) {
int remain = length - offset;
if (remain <= 0) {
break;
}
int numRead = in.read(buffer, offset, remain);
if (numRead == -1) {
throw new IOException(
"Reached EOF, read " + offset + " expecting " + length);
}
offset += numRead;
}
return buffer;
}
/**
* Equal content.
*
* @param file
* the file
* @param content
* the content
* @return true, if successful
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static boolean equalContent(File file, byte[] content)
throws IOException {
long length = file.length();
if (length > Integer.MAX_VALUE) {
throw new IOException("File '" + file + "' too big");
}
InputStream in = new FileInputStream(file);
try {
byte[] fileContent = loadExact(in, (int) length);
return java.util.Arrays.equals(content, fileContent);
} finally {
in.close();
}
}
/**
* Save.
*
* @param file
* the file
* @param content
* the content
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static void save(File file, byte[] content) throws IOException {
FileOutputStream out = new FileOutputStream(file);
try {
out.write(content);
} finally {
out.close();
}
}
/**
* Reads line without buffering.
*
* @param in
* the in
* @return the string
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static String readLine(InputStream in) throws IOException {
int b;
StringBuffer sb = null;
OUTER: while ((b = in.read()) != -1) {
if (sb == null) {
sb = new StringBuffer();
}
switch (b) {
case (byte) '\n':
break OUTER;
case (byte) '\r':
break;
default:
sb.append((char) b);
break;
}
}
return sb == null ? null : sb.toString();
}
/**
* Touch.
*
* @param file
* the file
*/
public static void touch(File file) {
file.setLastModified(System.currentTimeMillis());
}
/**
* Save strings.
*
* @param file
* the file
* @param list
* the list
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static void saveStrings(File file, Collection list)
throws IOException {
BufferedOutputStream bout = new BufferedOutputStream(
new FileOutputStream(file));
try {
PrintWriter writer = new PrintWriter(bout);
Iterator i = list.iterator();
while (i.hasNext()) {
String text = (String) i.next();
writer.println(text);
}
writer.flush();
writer.close();
} finally {
bout.close();
}
}
/**
* Load strings.
*
* @param file
* the file
* @return the list
* @throws IOException
* Signals that an I/O exception has occurred.
*/
public static List<String> loadStrings(File file) throws IOException {
List<String> list = new LinkedList<String>();
InputStream in = new FileInputStream(file);
try {
BufferedReader reader = new BufferedReader(
new InputStreamReader(in));
String line;
while ((line = reader.readLine()) != null) {
list.add(line);
}
return list;
} finally {
in.close();
}
}
}