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/*
* Copyright 2014 The gRPC Authors
*
* 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.Charsets.UTF_8;
import com.google.common.base.Preconditions;
import io.grpc.KnownLength;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.charset.Charset;
/**
* Utility methods for creating {@link ReadableBuffer} instances.
*/
public final class ReadableBuffers {
private static final ReadableBuffer EMPTY_BUFFER = new ByteArrayWrapper(new byte[0]);
/**
* Returns an empty {@link ReadableBuffer} instance.
*/
public static ReadableBuffer empty() {
return EMPTY_BUFFER;
}
/**
* Shortcut for {@code wrap(bytes, 0, bytes.length}.
*/
public static ReadableBuffer wrap(byte[] bytes) {
return new ByteArrayWrapper(bytes, 0, bytes.length);
}
/**
* Creates a new {@link ReadableBuffer} that is backed by the given byte array.
*
* @param bytes the byte array being wrapped.
* @param offset the starting offset for the buffer within the byte array.
* @param length the length of the buffer from the {@code offset} index.
*/
public static ReadableBuffer wrap(byte[] bytes, int offset, int length) {
return new ByteArrayWrapper(bytes, offset, length);
}
/**
* Creates a new {@link ReadableBuffer} that is backed by the given {@link ByteBuffer}. Calls to
* read from the buffer will increment the position of the {@link ByteBuffer}.
*/
public static ReadableBuffer wrap(ByteBuffer bytes) {
return new ByteReadableBufferWrapper(bytes);
}
/**
* Reads an entire {@link ReadableBuffer} to a new array. After calling this method, the buffer
* will contain no readable bytes.
*/
public static byte[] readArray(ReadableBuffer buffer) {
Preconditions.checkNotNull(buffer, "buffer");
int length = buffer.readableBytes();
byte[] bytes = new byte[length];
buffer.readBytes(bytes, 0, length);
return bytes;
}
/**
* Reads the entire {@link ReadableBuffer} to a new {@link String} with the given charset.
*/
public static String readAsString(ReadableBuffer buffer, Charset charset) {
Preconditions.checkNotNull(charset, "charset");
byte[] bytes = readArray(buffer);
return new String(bytes, charset);
}
/**
* Reads the entire {@link ReadableBuffer} to a new {@link String} using UTF-8 decoding.
*/
public static String readAsStringUtf8(ReadableBuffer buffer) {
return readAsString(buffer, UTF_8);
}
/**
* Creates a new {@link InputStream} backed by the given buffer. Any read taken on the stream will
* automatically increment the read position of this buffer. Closing the stream, however, does not
* affect the original buffer.
*
* @param buffer the buffer backing the new {@link InputStream}.
* @param owner if {@code true}, the returned stream will close the buffer when closed.
*/
public static InputStream openStream(ReadableBuffer buffer, boolean owner) {
return new BufferInputStream(owner ? buffer : ignoreClose(buffer));
}
/**
* Decorates the given {@link ReadableBuffer} to ignore calls to {@link ReadableBuffer#close}.
*
* @param buffer the buffer to be decorated.
* @return a wrapper around {@code buffer} that ignores calls to {@link ReadableBuffer#close}.
*/
public static ReadableBuffer ignoreClose(ReadableBuffer buffer) {
return new ForwardingReadableBuffer(buffer) {
@Override
public void close() {
// Ignore.
}
};
}
/**
* A {@link ReadableBuffer} that is backed by a byte array.
*/
private static class ByteArrayWrapper extends AbstractReadableBuffer {
int offset;
final int end;
final byte[] bytes;
ByteArrayWrapper(byte[] bytes) {
this(bytes, 0, bytes.length);
}
ByteArrayWrapper(byte[] bytes, int offset, int length) {
Preconditions.checkArgument(offset >= 0, "offset must be >= 0");
Preconditions.checkArgument(length >= 0, "length must be >= 0");
Preconditions.checkArgument(offset + length <= bytes.length,
"offset + length exceeds array boundary");
this.bytes = Preconditions.checkNotNull(bytes, "bytes");
this.offset = offset;
this.end = offset + length;
}
@Override
public int readableBytes() {
return end - offset;
}
@Override
public void skipBytes(int length) {
checkReadable(length);
offset += length;
}
@Override
public int readUnsignedByte() {
checkReadable(1);
return bytes[offset++] & 0xFF;
}
@Override
public void readBytes(byte[] dest, int destIndex, int length) {
System.arraycopy(bytes, offset, dest, destIndex, length);
offset += length;
}
@Override
public void readBytes(ByteBuffer dest) {
Preconditions.checkNotNull(dest, "dest");
int length = dest.remaining();
checkReadable(length);
dest.put(bytes, offset, length);
offset += length;
}
@Override
public void readBytes(OutputStream dest, int length) throws IOException {
checkReadable(length);
dest.write(bytes, offset, length);
offset += length;
}
@Override
public ByteArrayWrapper readBytes(int length) {
checkReadable(length);
int originalOffset = offset;
offset += length;
return new ByteArrayWrapper(bytes, originalOffset, length);
}
@Override
public boolean hasArray() {
return true;
}
@Override
public byte[] array() {
return bytes;
}
@Override
public int arrayOffset() {
return offset;
}
}
/**
* A {@link ReadableBuffer} that is backed by a {@link ByteBuffer}.
*/
private static class ByteReadableBufferWrapper extends AbstractReadableBuffer {
final ByteBuffer bytes;
ByteReadableBufferWrapper(ByteBuffer bytes) {
this.bytes = Preconditions.checkNotNull(bytes, "bytes");
}
@Override
public int readableBytes() {
return bytes.remaining();
}
@Override
public int readUnsignedByte() {
checkReadable(1);
return bytes.get() & 0xFF;
}
@Override
public void skipBytes(int length) {
checkReadable(length);
bytes.position(bytes.position() + length);
}
@Override
public void readBytes(byte[] dest, int destOffset, int length) {
checkReadable(length);
bytes.get(dest, destOffset, length);
}
@Override
public void readBytes(ByteBuffer dest) {
Preconditions.checkNotNull(dest, "dest");
int length = dest.remaining();
checkReadable(length);
// Change the limit so that only length bytes are available.
int prevLimit = bytes.limit();
bytes.limit(bytes.position() + length);
// Write the bytes and restore the original limit.
dest.put(bytes);
bytes.limit(prevLimit);
}
@Override
public void readBytes(OutputStream dest, int length) throws IOException {
checkReadable(length);
if (hasArray()) {
dest.write(array(), arrayOffset(), length);
bytes.position(bytes.position() + length);
} else {
// The buffer doesn't support array(). Copy the data to an intermediate buffer.
byte[] array = new byte[length];
bytes.get(array);
dest.write(array);
}
}
@Override
public ByteReadableBufferWrapper readBytes(int length) {
checkReadable(length);
ByteBuffer buffer = bytes.duplicate();
buffer.limit(bytes.position() + length);
bytes.position(bytes.position() + length);
return new ByteReadableBufferWrapper(buffer);
}
@Override
public boolean hasArray() {
return bytes.hasArray();
}
@Override
public byte[] array() {
return bytes.array();
}
@Override
public int arrayOffset() {
return bytes.arrayOffset() + bytes.position();
}
}
/**
* An {@link InputStream} that is backed by a {@link ReadableBuffer}.
*/
private static final class BufferInputStream extends InputStream implements KnownLength {
final ReadableBuffer buffer;
public BufferInputStream(ReadableBuffer buffer) {
this.buffer = Preconditions.checkNotNull(buffer, "buffer");
}
@Override
public int available() throws IOException {
return buffer.readableBytes();
}
@Override
public int read() {
if (buffer.readableBytes() == 0) {
// EOF.
return -1;
}
return buffer.readUnsignedByte();
}
@Override
public int read(byte[] dest, int destOffset, int length) throws IOException {
if (buffer.readableBytes() == 0) {
// EOF.
return -1;
}
length = Math.min(buffer.readableBytes(), length);
buffer.readBytes(dest, destOffset, length);
return length;
}
@Override
public void close() throws IOException {
buffer.close();
}
}
private ReadableBuffers() {}
}
