com.google.common.io.ByteStreams Maven / Gradle / Ivy
/*
* Copyright (C) 2007 The Guava 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 com.google.common.io;
import static com.google.common.base.Preconditions.checkArgument;
import static com.google.common.base.Preconditions.checkNotNull;
import static com.google.common.base.Preconditions.checkPositionIndex;
import com.google.common.annotations.Beta;
import com.google.common.hash.HashCode;
import com.google.common.hash.HashFunction;
import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.DataInput;
import java.io.DataInputStream;
import java.io.DataOutput;
import java.io.DataOutputStream;
import java.io.EOFException;
import java.io.FilterInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.nio.ByteBuffer;
import java.nio.channels.ReadableByteChannel;
import java.nio.channels.WritableByteChannel;
import java.util.Arrays;
import java.util.zip.Checksum;
/**
* Provides utility methods for working with byte arrays and I/O streams.
*
* @author Chris Nokleberg
* @author Colin Decker
* @since 1.0
*/
@Beta
public final class ByteStreams {
private static final int BUF_SIZE = 0x1000; // 4K
private ByteStreams() {}
/**
* Returns a factory that will supply instances of
* {@link ByteArrayInputStream} that read from the given byte array.
*
* @param b the input buffer
* @return the factory
*/
public static InputSupplier newInputStreamSupplier(
byte[] b) {
return ByteStreams.asInputSupplier(asByteSource(b));
}
/**
* Returns a factory that will supply instances of
* {@link ByteArrayInputStream} that read from the given byte array.
*
* @param b the input buffer
* @param off the offset in the buffer of the first byte to read
* @param len the maximum number of bytes to read from the buffer
* @return the factory
*/
public static InputSupplier newInputStreamSupplier(
final byte[] b, final int off, final int len) {
return ByteStreams.asInputSupplier(asByteSource(b).slice(off, len));
}
/**
* Returns a new {@link ByteSource} that reads bytes from the given byte array.
*
* @since 14.0
*/
public static ByteSource asByteSource(byte[] b) {
return new ByteArrayByteSource(b);
}
private static final class ByteArrayByteSource extends ByteSource {
private final byte[] bytes;
private ByteArrayByteSource(byte[] bytes) {
this.bytes = checkNotNull(bytes);
}
@Override
public InputStream openStream() throws IOException {
return new ByteArrayInputStream(bytes);
}
@Override
public long size() throws IOException {
return bytes.length;
}
@Override
public byte[] read() throws IOException {
return bytes.clone();
}
@Override
public long copyTo(OutputStream output) throws IOException {
output.write(bytes);
return bytes.length;
}
@Override
public HashCode hash(HashFunction hashFunction) throws IOException {
return hashFunction.hashBytes(bytes);
}
// TODO(user): Possibly override slice()
@Override
public String toString() {
return "ByteStreams.asByteSource(" + BaseEncoding.base16().encode(bytes) + ")";
}
}
/**
* Writes a byte array to an output stream from the given supplier.
*
* @param from the bytes to write
* @param to the output supplier
* @throws IOException if an I/O error occurs
*/
public static void write(byte[] from,
OutputSupplier to) throws IOException {
asByteSink(to).write(from);
}
/**
* Opens input and output streams from the given suppliers, copies all
* bytes from the input to the output, and closes the streams.
*
* @param from the input factory
* @param to the output factory
* @return the number of bytes copied
* @throws IOException if an I/O error occurs
*/
public static long copy(InputSupplier from,
OutputSupplier to) throws IOException {
return asByteSource(from).copyTo(asByteSink(to));
}
/**
* Opens an input stream from the supplier, copies all bytes from the
* input to the output, and closes the input stream. Does not close
* or flush the output stream.
*
* @param from the input factory
* @param to the output stream to write to
* @return the number of bytes copied
* @throws IOException if an I/O error occurs
*/
public static long copy(InputSupplier from,
OutputStream to) throws IOException {
return asByteSource(from).copyTo(to);
}
/**
* Opens an output stream from the supplier, copies all bytes from the input
* to the output, and closes the output stream. Does not close or flush the
* input stream.
*
* @param from the input stream to read from
* @param to the output factory
* @return the number of bytes copied
* @throws IOException if an I/O error occurs
* @since 10.0
*/
public static long copy(InputStream from,
OutputSupplier to) throws IOException {
return asByteSink(to).writeFrom(from);
}
/**
* Copies all bytes from the input stream to the output stream.
* Does not close or flush either stream.
*
* @param from the input stream to read from
* @param to the output stream to write to
* @return the number of bytes copied
* @throws IOException if an I/O error occurs
*/
public static long copy(InputStream from, OutputStream to)
throws IOException {
checkNotNull(from);
checkNotNull(to);
byte[] buf = new byte[BUF_SIZE];
long total = 0;
while (true) {
int r = from.read(buf);
if (r == -1) {
break;
}
to.write(buf, 0, r);
total += r;
}
return total;
}
/**
* Copies all bytes from the readable channel to the writable channel.
* Does not close or flush either channel.
*
* @param from the readable channel to read from
* @param to the writable channel to write to
* @return the number of bytes copied
* @throws IOException if an I/O error occurs
*/
public static long copy(ReadableByteChannel from,
WritableByteChannel to) throws IOException {
checkNotNull(from);
checkNotNull(to);
ByteBuffer buf = ByteBuffer.allocate(BUF_SIZE);
long total = 0;
while (from.read(buf) != -1) {
buf.flip();
while (buf.hasRemaining()) {
total += to.write(buf);
}
buf.clear();
}
return total;
}
/**
* Reads all bytes from an input stream into a byte array.
* Does not close the stream.
*
* @param in the input stream to read from
* @return a byte array containing all the bytes from the stream
* @throws IOException if an I/O error occurs
*/
public static byte[] toByteArray(InputStream in) throws IOException {
ByteArrayOutputStream out = new ByteArrayOutputStream();
copy(in, out);
return out.toByteArray();
}
/**
* Returns the data from a {@link InputStream} factory as a byte array.
*
* @param supplier the factory
* @throws IOException if an I/O error occurs
*/
public static byte[] toByteArray(
InputSupplier supplier) throws IOException {
return asByteSource(supplier).read();
}
/**
* Returns a new {@link ByteArrayDataInput} instance to read from the {@code
* bytes} array from the beginning.
*/
public static ByteArrayDataInput newDataInput(byte[] bytes) {
return new ByteArrayDataInputStream(bytes);
}
/**
* Returns a new {@link ByteArrayDataInput} instance to read from the {@code
* bytes} array, starting at the given position.
*
* @throws IndexOutOfBoundsException if {@code start} is negative or greater
* than the length of the array
*/
public static ByteArrayDataInput newDataInput(byte[] bytes, int start) {
checkPositionIndex(start, bytes.length);
return new ByteArrayDataInputStream(bytes, start);
}
private static class ByteArrayDataInputStream implements ByteArrayDataInput {
final DataInput input;
ByteArrayDataInputStream(byte[] bytes) {
this.input = new DataInputStream(new ByteArrayInputStream(bytes));
}
ByteArrayDataInputStream(byte[] bytes, int start) {
this.input = new DataInputStream(
new ByteArrayInputStream(bytes, start, bytes.length - start));
}
@Override public void readFully(byte b[]) {
try {
input.readFully(b);
} catch (IOException e) {
throw new IllegalStateException(e);
}
}
@Override public void readFully(byte b[], int off, int len) {
try {
input.readFully(b, off, len);
} catch (IOException e) {
throw new IllegalStateException(e);
}
}
@Override public int skipBytes(int n) {
try {
return input.skipBytes(n);
} catch (IOException e) {
throw new IllegalStateException(e);
}
}
@Override public boolean readBoolean() {
try {
return input.readBoolean();
} catch (IOException e) {
throw new IllegalStateException(e);
}
}
@Override public byte readByte() {
try {
return input.readByte();
} catch (EOFException e) {
throw new IllegalStateException(e);
} catch (IOException impossible) {
throw new AssertionError(impossible);
}
}
@Override public int readUnsignedByte() {
try {
return input.readUnsignedByte();
} catch (IOException e) {
throw new IllegalStateException(e);
}
}
@Override public short readShort() {
try {
return input.readShort();
} catch (IOException e) {
throw new IllegalStateException(e);
}
}
@Override public int readUnsignedShort() {
try {
return input.readUnsignedShort();
} catch (IOException e) {
throw new IllegalStateException(e);
}
}
@Override public char readChar() {
try {
return input.readChar();
} catch (IOException e) {
throw new IllegalStateException(e);
}
}
@Override public int readInt() {
try {
return input.readInt();
} catch (IOException e) {
throw new IllegalStateException(e);
}
}
@Override public long readLong() {
try {
return input.readLong();
} catch (IOException e) {
throw new IllegalStateException(e);
}
}
@Override public float readFloat() {
try {
return input.readFloat();
} catch (IOException e) {
throw new IllegalStateException(e);
}
}
@Override public double readDouble() {
try {
return input.readDouble();
} catch (IOException e) {
throw new IllegalStateException(e);
}
}
@Override public String readLine() {
try {
return input.readLine();
} catch (IOException e) {
throw new IllegalStateException(e);
}
}
@Override public String readUTF() {
try {
return input.readUTF();
} catch (IOException e) {
throw new IllegalStateException(e);
}
}
}
/**
* Returns a new {@link ByteArrayDataOutput} instance with a default size.
*/
public static ByteArrayDataOutput newDataOutput() {
return new ByteArrayDataOutputStream();
}
/**
* Returns a new {@link ByteArrayDataOutput} instance sized to hold
* {@code size} bytes before resizing.
*
* @throws IllegalArgumentException if {@code size} is negative
*/
public static ByteArrayDataOutput newDataOutput(int size) {
checkArgument(size >= 0, "Invalid size: %s", size);
return new ByteArrayDataOutputStream(size);
}
@SuppressWarnings("deprecation") // for writeBytes
private static class ByteArrayDataOutputStream
implements ByteArrayDataOutput {
final DataOutput output;
final ByteArrayOutputStream byteArrayOutputSteam;
ByteArrayDataOutputStream() {
this(new ByteArrayOutputStream());
}
ByteArrayDataOutputStream(int size) {
this(new ByteArrayOutputStream(size));
}
ByteArrayDataOutputStream(ByteArrayOutputStream byteArrayOutputSteam) {
this.byteArrayOutputSteam = byteArrayOutputSteam;
output = new DataOutputStream(byteArrayOutputSteam);
}
@Override public void write(int b) {
try {
output.write(b);
} catch (IOException impossible) {
throw new AssertionError(impossible);
}
}
@Override public void write(byte[] b) {
try {
output.write(b);
} catch (IOException impossible) {
throw new AssertionError(impossible);
}
}
@Override public void write(byte[] b, int off, int len) {
try {
output.write(b, off, len);
} catch (IOException impossible) {
throw new AssertionError(impossible);
}
}
@Override public void writeBoolean(boolean v) {
try {
output.writeBoolean(v);
} catch (IOException impossible) {
throw new AssertionError(impossible);
}
}
@Override public void writeByte(int v) {
try {
output.writeByte(v);
} catch (IOException impossible) {
throw new AssertionError(impossible);
}
}
@Override public void writeBytes(String s) {
try {
output.writeBytes(s);
} catch (IOException impossible) {
throw new AssertionError(impossible);
}
}
@Override public void writeChar(int v) {
try {
output.writeChar(v);
} catch (IOException impossible) {
throw new AssertionError(impossible);
}
}
@Override public void writeChars(String s) {
try {
output.writeChars(s);
} catch (IOException impossible) {
throw new AssertionError(impossible);
}
}
@Override public void writeDouble(double v) {
try {
output.writeDouble(v);
} catch (IOException impossible) {
throw new AssertionError(impossible);
}
}
@Override public void writeFloat(float v) {
try {
output.writeFloat(v);
} catch (IOException impossible) {
throw new AssertionError(impossible);
}
}
@Override public void writeInt(int v) {
try {
output.writeInt(v);
} catch (IOException impossible) {
throw new AssertionError(impossible);
}
}
@Override public void writeLong(long v) {
try {
output.writeLong(v);
} catch (IOException impossible) {
throw new AssertionError(impossible);
}
}
@Override public void writeShort(int v) {
try {
output.writeShort(v);
} catch (IOException impossible) {
throw new AssertionError(impossible);
}
}
@Override public void writeUTF(String s) {
try {
output.writeUTF(s);
} catch (IOException impossible) {
throw new AssertionError(impossible);
}
}
@Override public byte[] toByteArray() {
return byteArrayOutputSteam.toByteArray();
}
}
private static final OutputStream NULL_OUTPUT_STREAM =
new OutputStream() {
/** Discards the specified byte. */
@Override public void write(int b) {
}
/** Discards the specified byte array. */
@Override public void write(byte[] b) {
checkNotNull(b);
}
/** Discards the specified byte array. */
@Override public void write(byte[] b, int off, int len) {
checkNotNull(b);
}
@Override
public String toString() {
return "ByteStreams.nullOutputStream()";
}
};
/**
* Returns an {@link OutputStream} that simply discards written bytes.
*
* @since 14.0 (since 1.0 as com.google.common.io.NullOutputStream)
*/
public static OutputStream nullOutputStream() {
return NULL_OUTPUT_STREAM;
}
/**
* Wraps a {@link InputStream}, limiting the number of bytes which can be
* read.
*
* @param in the input stream to be wrapped
* @param limit the maximum number of bytes to be read
* @return a length-limited {@link InputStream}
* @since 14.0 (since 1.0 as com.google.common.io.LimitInputStream)
*/
public static InputStream limit(InputStream in, long limit) {
return new LimitedInputStream(in, limit);
}
private static final class LimitedInputStream extends FilterInputStream {
private long left;
private long mark = -1;
LimitedInputStream(InputStream in, long limit) {
super(in);
checkNotNull(in);
checkArgument(limit >= 0, "limit must be non-negative");
left = limit;
}
@Override public int available() throws IOException {
return (int) Math.min(in.available(), left);
}
// it's okay to mark even if mark isn't supported, as reset won't work
@Override public synchronized void mark(int readLimit) {
in.mark(readLimit);
mark = left;
}
@Override public int read() throws IOException {
if (left == 0) {
return -1;
}
int result = in.read();
if (result != -1) {
--left;
}
return result;
}
@Override public int read(byte[] b, int off, int len) throws IOException {
if (left == 0) {
return -1;
}
len = (int) Math.min(len, left);
int result = in.read(b, off, len);
if (result != -1) {
left -= result;
}
return result;
}
@Override public synchronized void reset() throws IOException {
if (!in.markSupported()) {
throw new IOException("Mark not supported");
}
if (mark == -1) {
throw new IOException("Mark not set");
}
in.reset();
left = mark;
}
@Override public long skip(long n) throws IOException {
n = Math.min(n, left);
long skipped = in.skip(n);
left -= skipped;
return skipped;
}
}
/** Returns the length of a supplied input stream, in bytes. */
public static long length(
InputSupplier supplier) throws IOException {
return asByteSource(supplier).size();
}
/**
* Returns true if the supplied input streams contain the same bytes.
*
* @throws IOException if an I/O error occurs
*/
public static boolean equal(InputSupplier supplier1,
InputSupplier supplier2) throws IOException {
return asByteSource(supplier1).contentEquals(asByteSource(supplier2));
}
/**
* Attempts to read enough bytes from the stream to fill the given byte array,
* with the same behavior as {@link DataInput#readFully(byte[])}.
* Does not close the stream.
*
* @param in the input stream to read from.
* @param b the buffer into which the data is read.
* @throws EOFException if this stream reaches the end before reading all
* the bytes.
* @throws IOException if an I/O error occurs.
*/
public static void readFully(InputStream in, byte[] b) throws IOException {
readFully(in, b, 0, b.length);
}
/**
* Attempts to read {@code len} bytes from the stream into the given array
* starting at {@code off}, with the same behavior as
* {@link DataInput#readFully(byte[], int, int)}. Does not close the
* stream.
*
* @param in the input stream to read from.
* @param b the buffer into which the data is read.
* @param off an int specifying the offset into the data.
* @param len an int specifying the number of bytes to read.
* @throws EOFException if this stream reaches the end before reading all
* the bytes.
* @throws IOException if an I/O error occurs.
*/
public static void readFully(
InputStream in, byte[] b, int off, int len) throws IOException {
int read = read(in, b, off, len);
if (read != len) {
throw new EOFException("reached end of stream after reading "
+ read + " bytes; " + len + " bytes expected");
}
}
/**
* Discards {@code n} bytes of data from the input stream. This method
* will block until the full amount has been skipped. Does not close the
* stream.
*
* @param in the input stream to read from
* @param n the number of bytes to skip
* @throws EOFException if this stream reaches the end before skipping all
* the bytes
* @throws IOException if an I/O error occurs, or the stream does not
* support skipping
*/
public static void skipFully(InputStream in, long n) throws IOException {
long toSkip = n;
while (n > 0) {
long amt = in.skip(n);
if (amt == 0) {
// Force a blocking read to avoid infinite loop
if (in.read() == -1) {
long skipped = toSkip - n;
throw new EOFException("reached end of stream after skipping "
+ skipped + " bytes; " + toSkip + " bytes expected");
}
n--;
} else {
n -= amt;
}
}
}
/**
* Process the bytes of a supplied stream
*
* @param supplier the input stream factory
* @param processor the object to which to pass the bytes of the stream
* @return the result of the byte processor
* @throws IOException if an I/O error occurs
*/
public static T readBytes(
InputSupplier supplier,
ByteProcessor processor) throws IOException {
checkNotNull(supplier);
checkNotNull(processor);
Closer closer = Closer.create();
try {
InputStream in = closer.register(supplier.getInput());
return readBytes(in, processor);
} catch (Throwable e) {
throw closer.rethrow(e);
} finally {
closer.close();
}
}
/**
* Process the bytes of the given input stream using the given processor.
*
* @param input the input stream to process
* @param processor the object to which to pass the bytes of the stream
* @return the result of the byte processor
* @throws IOException if an I/O error occurs
* @since 14.0
*/
public static T readBytes(
InputStream input, ByteProcessor processor) throws IOException {
checkNotNull(input);
checkNotNull(processor);
byte[] buf = new byte[BUF_SIZE];
int read;
do {
read = input.read(buf);
} while (read != -1 && processor.processBytes(buf, 0, read));
return processor.getResult();
}
/**
* Computes and returns the checksum value for a supplied input stream.
* The checksum object is reset when this method returns successfully.
*
* @param supplier the input stream factory
* @param checksum the checksum object
* @return the result of {@link Checksum#getValue} after updating the
* checksum object with all of the bytes in the stream
* @throws IOException if an I/O error occurs
* @deprecated Use {@code hash} with the {@code Hashing.crc32()} or
* {@code Hashing.adler32()} hash functions instead. This method is
* scheduled to be removed in Guava 15.0.
*/
@Deprecated
public static long getChecksum(
InputSupplier supplier, final Checksum checksum)
throws IOException {
checkNotNull(checksum);
return readBytes(supplier, new ByteProcessor() {
@Override
public boolean processBytes(byte[] buf, int off, int len) {
checksum.update(buf, off, len);
return true;
}
@Override
public Long getResult() {
long result = checksum.getValue();
checksum.reset();
return result;
}
});
}
/**
* Computes the hash code of the data supplied by {@code supplier} using {@code
* hashFunction}.
*
* @param supplier the input stream factory
* @param hashFunction the hash function to use to hash the data
* @return the {@link HashCode} of all of the bytes in the input stream
* @throws IOException if an I/O error occurs
* @since 12.0
*/
public static HashCode hash(
InputSupplier supplier, HashFunction hashFunction)
throws IOException {
return asByteSource(supplier).hash(hashFunction);
}
/**
* Reads some bytes from an input stream and stores them into the buffer array
* {@code b}. This method blocks until {@code len} bytes of input data have
* been read into the array, or end of file is detected. The number of bytes
* read is returned, possibly zero. Does not close the stream.
*
* A caller can detect EOF if the number of bytes read is less than
* {@code len}. All subsequent calls on the same stream will return zero.
*
*
If {@code b} is null, a {@code NullPointerException} is thrown. If
* {@code off} is negative, or {@code len} is negative, or {@code off+len} is
* greater than the length of the array {@code b}, then an
* {@code IndexOutOfBoundsException} is thrown. If {@code len} is zero, then
* no bytes are read. Otherwise, the first byte read is stored into element
* {@code b[off]}, the next one into {@code b[off+1]}, and so on. The number
* of bytes read is, at most, equal to {@code len}.
*
* @param in the input stream to read from
* @param b the buffer into which the data is read
* @param off an int specifying the offset into the data
* @param len an int specifying the number of bytes to read
* @return the number of bytes read
* @throws IOException if an I/O error occurs
*/
public static int read(InputStream in, byte[] b, int off, int len)
throws IOException {
checkNotNull(in);
checkNotNull(b);
if (len < 0) {
throw new IndexOutOfBoundsException("len is negative");
}
int total = 0;
while (total < len) {
int result = in.read(b, off + total, len - total);
if (result == -1) {
break;
}
total += result;
}
return total;
}
/**
* Returns an {@link InputSupplier} that returns input streams from the
* an underlying supplier, where each stream starts at the given
* offset and is limited to the specified number of bytes.
*
* @param supplier the supplier from which to get the raw streams
* @param offset the offset in bytes into the underlying stream where
* the returned streams will start
* @param length the maximum length of the returned streams
* @throws IllegalArgumentException if offset or length are negative
*/
public static InputSupplier slice(
final InputSupplier supplier,
final long offset,
final long length) {
return asInputSupplier(asByteSource(supplier).slice(offset, length));
}
/**
* Joins multiple {@link InputStream} suppliers into a single supplier.
* Streams returned from the supplier will contain the concatenated data from
* the streams of the underlying suppliers.
*
* Only one underlying input stream will be open at a time. Closing the
* joined stream will close the open underlying stream.
*
*
Reading from the joined stream will throw a {@link NullPointerException}
* if any of the suppliers are null or return null.
*
* @param suppliers the suppliers to concatenate
* @return a supplier that will return a stream containing the concatenated
* stream data
*/
public static InputSupplier join(
final Iterable> suppliers) {
checkNotNull(suppliers);
return new InputSupplier() {
@Override public InputStream getInput() throws IOException {
return new MultiInputStream(suppliers.iterator());
}
};
}
/** Varargs form of {@link #join(Iterable)}. */
public static InputSupplier join(
InputSupplier... suppliers) {
return join(Arrays.asList(suppliers));
}
// TODO(user): Remove these once Input/OutputSupplier methods are removed
static InputSupplier asInputSupplier(
final ByteSource source) {
checkNotNull(source);
return new InputSupplier() {
@SuppressWarnings("unchecked") // used internally where known to be safe
@Override
public S getInput() throws IOException {
return (S) source.openStream();
}
};
}
static OutputSupplier asOutputSupplier(
final ByteSink sink) {
checkNotNull(sink);
return new OutputSupplier() {
@SuppressWarnings("unchecked") // used internally where known to be safe
@Override
public S getOutput() throws IOException {
return (S) sink.openStream();
}
};
}
static ByteSource asByteSource(
final InputSupplier supplier) {
checkNotNull(supplier);
return new ByteSource() {
@Override
public InputStream openStream() throws IOException {
return supplier.getInput();
}
};
}
static ByteSink asByteSink(
final OutputSupplier supplier) {
checkNotNull(supplier);
return new ByteSink() {
@Override
public OutputStream openStream() throws IOException {
return supplier.getOutput();
}
};
}
}
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