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/*******************************************************************************
* Copyright 2011 See AUTHORS file.
*
* Licensed 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 com.badlogic.gdx.utils;
import java.io.ByteArrayOutputStream;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.OutputStream;
import java.io.StringWriter;
import java.nio.Buffer;
import java.nio.ByteBuffer;
/** Provides utility methods to copy streams. */
public final class StreamUtils {
public static final int DEFAULT_BUFFER_SIZE = 4096;
public static final byte[] EMPTY_BYTES = new byte[0];
/** Allocates a {@value #DEFAULT_BUFFER_SIZE} byte[] for use as a temporary buffer and calls
* {@link #copyStream(InputStream, OutputStream, byte[])}. */
public static void copyStream (InputStream input, OutputStream output) throws IOException {
copyStream(input, output, new byte[DEFAULT_BUFFER_SIZE]);
}
/** Allocates a byte[] of the specified size for use as a temporary buffer and calls
* {@link #copyStream(InputStream, OutputStream, byte[])}. */
public static void copyStream (InputStream input, OutputStream output, int bufferSize) throws IOException {
copyStream(input, output, new byte[bufferSize]);
}
/** Copy the data from an {@link InputStream} to an {@link OutputStream}, using the specified byte[] as a temporary buffer. The
* stream is not closed. */
public static void copyStream (InputStream input, OutputStream output, byte[] buffer) throws IOException {
int bytesRead;
while ((bytesRead = input.read(buffer)) != -1) {
output.write(buffer, 0, bytesRead);
}
}
/** Allocates a {@value #DEFAULT_BUFFER_SIZE} byte[] for use as a temporary buffer and calls
* {@link #copyStream(InputStream, OutputStream, byte[])}. */
public static void copyStream (InputStream input, ByteBuffer output) throws IOException {
copyStream(input, output, new byte[DEFAULT_BUFFER_SIZE]);
}
/** Allocates a byte[] of the specified size for use as a temporary buffer and calls
* {@link #copyStream(InputStream, ByteBuffer, byte[])}. */
public static void copyStream (InputStream input, ByteBuffer output, int bufferSize) throws IOException {
copyStream(input, output, new byte[bufferSize]);
}
/** Copy the data from an {@link InputStream} to a {@link ByteBuffer}, using the specified byte[] as a temporary buffer. The
* buffer's limit is increased by the number of bytes copied, the position is left unchanged. The stream is not closed.
* @param output Must be a direct Buffer with native byte order and the buffer MUST be large enough to hold all the bytes in
* the stream. No error checking is performed.
* @return the number of bytes copied. */
public static int copyStream (InputStream input, ByteBuffer output, byte[] buffer) throws IOException {
int startPosition = output.position(), total = 0, bytesRead;
while ((bytesRead = input.read(buffer)) != -1) {
BufferUtils.copy(buffer, 0, output, bytesRead);
total += bytesRead;
((Buffer)output).position(startPosition + total);
}
((Buffer)output).position(startPosition);
return total;
}
/** Copy the data from an {@link InputStream} to a byte array. The stream is not closed. */
public static byte[] copyStreamToByteArray (InputStream input) throws IOException {
return copyStreamToByteArray(input, input.available());
}
/** Copy the data from an {@link InputStream} to a byte array. The stream is not closed.
* @param estimatedSize Used to allocate the output byte[] to possibly avoid an array copy. */
public static byte[] copyStreamToByteArray (InputStream input, int estimatedSize) throws IOException {
ByteArrayOutputStream baos = new OptimizedByteArrayOutputStream(Math.max(0, estimatedSize));
copyStream(input, baos);
return baos.toByteArray();
}
/** Calls {@link #copyStreamToString(InputStream, int, String)} using the input's {@link InputStream#available() available}
* size and the platform's default charset. */
public static String copyStreamToString (InputStream input) throws IOException {
return copyStreamToString(input, input.available(), null);
}
/** Calls {@link #copyStreamToString(InputStream, int, String)} using the platform's default charset. */
public static String copyStreamToString (InputStream input, int estimatedSize) throws IOException {
return copyStreamToString(input, estimatedSize, null);
}
/** Copy the data from an {@link InputStream} to a string using the specified charset.
* @param estimatedSize Used to allocate the output buffer to possibly avoid an array copy.
* @param charset May be null to use the platform's default charset. */
public static String copyStreamToString (InputStream input, int estimatedSize, @Null String charset) throws IOException {
InputStreamReader reader = charset == null ? new InputStreamReader(input) : new InputStreamReader(input, charset);
StringWriter writer = new StringWriter(Math.max(0, estimatedSize));
char[] buffer = new char[DEFAULT_BUFFER_SIZE];
int charsRead;
while ((charsRead = reader.read(buffer)) != -1) {
writer.write(buffer, 0, charsRead);
}
return writer.toString();
}
/** Close and ignore all errors. */
public static void closeQuietly (Closeable c) {
if (c != null) {
try {
c.close();
} catch (Throwable ignored) {
}
}
}
/** A ByteArrayOutputStream which avoids copying of the byte array if possible. */
static public class OptimizedByteArrayOutputStream extends ByteArrayOutputStream {
public OptimizedByteArrayOutputStream (int initialSize) {
super(initialSize);
}
@Override
public synchronized byte[] toByteArray () {
if (count == buf.length) return buf;
return super.toByteArray();
}
public byte[] getBuffer () {
return buf;
}
}
}