io.grpc.internal.IoUtils Maven / Gradle / Ivy
/*
* Copyright 2016, gRPC Authors All rights reserved.
*
* 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 io.grpc.internal;
import static com.google.common.base.Preconditions.checkNotNull;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
/** Common IoUtils for thrift and nanopb to convert inputstream to bytes. */
public final class IoUtils {
/** maximum buffer to be read is 16 KB. */
private static final int MAX_BUFFER_LENGTH = 16384;
/** Returns the byte array. */
public static byte[] toByteArray(InputStream in) throws IOException {
ByteArrayOutputStream out = new ByteArrayOutputStream();
copy(in, out);
return out.toByteArray();
}
/** Copies the data from input stream to output stream. */
public static long copy(InputStream from, OutputStream to) throws IOException {
// Copied from guava com.google.common.io.ByteStreams because its API is unstable (beta)
checkNotNull(from);
checkNotNull(to);
byte[] buf = new byte[MAX_BUFFER_LENGTH];
long total = 0;
while (true) {
int r = from.read(buf);
if (r == -1) {
break;
}
to.write(buf, 0, r);
total += r;
}
return total;
}
}