Package uk.ac.manchester.spinnaker.utils

Class ByteBufferUtils

java.lang.Object

uk.ac.manchester.spinnaker.utils.ByteBufferUtils

public abstract class ByteBufferUtils
extends Object

Utility methods for ByteBuffers.

Method Summary

Modifier and Type	Method	Description
static ByteBuffer	limitSlice(ByteBuffer src, int maxSize)	Make a slice of a byte buffer if it exceeds a given size.
static ByteBuffer	read(InputStream data, ByteBuffer workingBuffer, int maxRemaining)	Read a chunk of an input stream into a byte buffer.
static ByteBuffer	slice(ByteBuffer src, int from, int len)	Make a slice of a byte buffer without modifying the original buffer.
static MappableIterable<ByteBuffer>	sliceUp(ByteBuffer src, int chunkSize)	Slice up a buffer buffer into a sequence of (little-endian) byte buffers with a maximum size.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Details

slice

public static ByteBuffer slice(ByteBuffer src,
 int from,
 int len)

Make a slice of a byte buffer without modifying the original buffer.

Parameters:

src - The originating buffer.

from - The offset into the originating buffer where the slice starts.

len - The length of the slice.

Returns:

The little-endian slice. This will be read-only if and only if the original buffer is read-only.

limitSlice

public static ByteBuffer limitSlice(ByteBuffer src,
 int maxSize)

Make a slice of a byte buffer if it exceeds a given size.

Parameters:

src - The originating buffer.

maxSize - The maximum size of the resulting buffer.

Returns:

The original buffer or a little-endian slice. This will be read-only if and only if the original buffer is read-only.

sliceUp

public static MappableIterable<ByteBuffer> sliceUp(ByteBuffer src,
 int chunkSize)

Slice up a buffer buffer into a sequence of (little-endian) byte buffers with a maximum size.

Parameters:

src - The buffer to slice up.

chunkSize - Max size of each chunk. Must be positive.

Returns:

An iterable of little-endian chunks. Only the final chunk will be smaller than the requested chunk size.

read

public static ByteBuffer read(InputStream data,
 ByteBuffer workingBuffer,
 int maxRemaining)
                       throws IOException

Read a chunk of an input stream into a byte buffer.

Parameters:

data - Where to read from.

workingBuffer - The buffer to use. The number of bytes remaining in the buffer is the maximum number of bytes to read unless the maximum bytes remaining is smaller.

maxRemaining - The maximum number of bytes remaining in the input stream; bytes after that point won't be read even if they exist.

Returns:

A view on the buffer with the data in it (endianness undefined), or null if EOF or the limit is reached.

Throws:

IOException - If reading fails.