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/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.cxf.helpers;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
import java.io.Writer;
import java.nio.charset.Charset;
public final class IOUtils {
public static final Charset UTF8_CHARSET = Charset.forName("utf-8");
private static final int DEFAULT_BUFFER_SIZE = 1024 * 4;
private IOUtils() {
}
/**
* Use this function instead of new String(byte[], String) to avoid surprises from
* non-standard default encodings.
* @param bytes
* @param charsetName
* @return
*/
public static String newStringFromBytes(byte[] bytes, String charsetName) {
try {
return new String(bytes, charsetName);
} catch (UnsupportedEncodingException e) {
throw
new RuntimeException("Impossible failure: Charset.forName(\""
+ charsetName + "\") returns invalid name.");
}
}
/**
* Use this function instead of new String(byte[]) to avoid surprises from non-standard default encodings.
* @param bytes
* @return
*/
public static String newStringFromBytes(byte[] bytes) {
return newStringFromBytes(bytes, UTF8_CHARSET.name());
}
/**
* Use this function instead of new String(byte[], int, int, String)
* to avoid surprises from non-standard default encodings.
* @param bytes
* @param charsetName
* @param start
* @param length
* @return
*/
public static String newStringFromBytes(byte[] bytes, String charsetName, int start, int length) {
try {
return new String(bytes, start, length, charsetName);
} catch (UnsupportedEncodingException e) {
throw
new RuntimeException("Impossible failure: Charset.forName(\""
+ charsetName + "\") returns invalid name.");
}
}
/**
* Use this function instead of new String(byte[], int, int)
* to avoid surprises from non-standard default encodings.
* @param bytes
* @param start
* @param length
* @return
*/
public static String newStringFromBytes(byte[] bytes, int start, int length) {
return newStringFromBytes(bytes, UTF8_CHARSET.name(), start, length);
}
public static int copy(final InputStream input, final OutputStream output)
throws IOException {
return copy(input, output, DEFAULT_BUFFER_SIZE);
}
public static int copyAndCloseInput(final InputStream input,
final OutputStream output) throws IOException {
try {
return copy(input, output, DEFAULT_BUFFER_SIZE);
} finally {
input.close();
}
}
public static int copyAndCloseInput(final InputStream input,
final OutputStream output, int bufferSize) throws IOException {
try {
return copy(input, output, bufferSize);
} finally {
input.close();
}
}
public static int copy(final InputStream input, final OutputStream output,
int bufferSize) throws IOException {
int avail = input.available();
if (avail > 262144) {
avail = 262144;
}
if (avail > bufferSize) {
bufferSize = avail;
}
final byte[] buffer = new byte[bufferSize];
int n = 0;
n = input.read(buffer);
int total = 0;
while (-1 != n) {
if (n == 0) {
throw new IOException("0 bytes read in violation of InputStream.read(byte[])");
}
output.write(buffer, 0, n);
total += n;
n = input.read(buffer);
}
return total;
}
public static void copy(final Reader input, final Writer output,
final int bufferSize) throws IOException {
final char[] buffer = new char[bufferSize];
int n = 0;
n = input.read(buffer);
while (-1 != n) {
if (n == 0) {
throw new IOException("0 bytes read in violation of InputStream.read(byte[])");
}
output.write(buffer, 0, n);
n = input.read(buffer);
}
}
public static String toString(final InputStream input) throws IOException {
return toString(input, DEFAULT_BUFFER_SIZE);
}
public static String toString(final InputStream input, String charset) throws IOException {
return toString(input, DEFAULT_BUFFER_SIZE, charset);
}
public static String toString(final InputStream input, int bufferSize)
throws IOException {
return toString(input, bufferSize, null);
}
public static String toString(final InputStream input, int bufferSize, String charset)
throws IOException {
int avail = input.available();
if (avail > bufferSize) {
bufferSize = avail;
}
Reader reader = charset == null ? new InputStreamReader(input, UTF8_CHARSET)
: new InputStreamReader(input, charset);
return toString(reader, bufferSize);
}
public static String toString(final Reader input) throws IOException {
return toString(input, DEFAULT_BUFFER_SIZE);
}
public static String toString(final Reader input, int bufSize) throws IOException {
StringBuilder buf = new StringBuilder();
final char[] buffer = new char[bufSize];
int n = 0;
n = input.read(buffer);
while (-1 != n) {
if (n == 0) {
throw new IOException("0 bytes read in violation of InputStream.read(byte[])");
}
buf.append(new String(buffer, 0, n));
n = input.read(buffer);
}
input.close();
return buf.toString();
}
public static String readStringFromStream(InputStream in)
throws IOException {
StringBuilder sb = new StringBuilder(1024);
for (int i = in.read(); i != -1; i = in.read()) {
sb.append((char) i);
}
in.close();
return sb.toString();
}
/**
* Load the InputStream into memory and return a ByteArrayInputStream that
* represents it. Closes the in stream.
*
* @param in
* @return
* @throws IOException
*/
public static ByteArrayInputStream loadIntoBAIS(InputStream in)
throws IOException {
int i = in.available();
if (i < DEFAULT_BUFFER_SIZE) {
i = DEFAULT_BUFFER_SIZE;
}
LoadingByteArrayOutputStream bout = new LoadingByteArrayOutputStream(i);
copy(in, bout);
in.close();
return bout.createInputStream();
}
public static void consume(InputStream in) throws IOException {
int i = in.available();
if (i == 0) {
//if i is 0, then we MAY have already hit the end of the stream
//so try a read and return rather than allocate a buffer and such
int i2 = in.read();
if (i2 == -1) {
return;
}
//reading the byte may have caused a buffer to fill
i = in.available();
}
if (i < DEFAULT_BUFFER_SIZE) {
i = DEFAULT_BUFFER_SIZE;
}
if (i > 65536) {
i = 65536;
}
byte bytes[] = new byte[i];
while (in.read(bytes) != -1) {
//nothing - just discarding
}
}
public static byte[] readBytesFromStream(InputStream in) throws IOException {
int i = in.available();
if (i < DEFAULT_BUFFER_SIZE) {
i = DEFAULT_BUFFER_SIZE;
}
ByteArrayOutputStream bos = new ByteArrayOutputStream(i);
copy(in, bos);
in.close();
return bos.toByteArray();
}
}
