org.apache.commons.compress.utils

Class IOUtils

java.lang.Object

org.apache.commons.compress.utils.IOUtils

public final class IOUtils
extends java.lang.Object

Utility functions

Method Summary

Modifier and Type	Method and Description
static void	closeQuietly(java.io.Closeable c) Closes the given Closeable and swallows any IOException that may occur.
static long	copy(java.io.InputStream input, java.io.OutputStream output) Copies the content of a InputStream into an OutputStream.
static long	copy(java.io.InputStream input, java.io.OutputStream output, int buffersize) Copies the content of a InputStream into an OutputStream
static int	readFully(java.io.InputStream input, byte[] b) Reads as much from input as possible to fill the given array.
static int	readFully(java.io.InputStream input, byte[] b, int offset, int len) Reads as much from input as possible to fill the given array with the given amount of bytes.
static void	readFully(java.nio.channels.ReadableByteChannel channel, java.nio.ByteBuffer b) Reads b.remaining() bytes from the given channel starting at the current channel's position.
static long	skip(java.io.InputStream input, long numToSkip) Skips the given number of bytes by repeatedly invoking skip on the given input stream if necessary.
static byte[]	toByteArray(java.io.InputStream input) Gets the contents of an InputStream as a byte[].

Methods inherited from class java.lang.Object

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

Method Detail

copy

public static long copy(java.io.InputStream input,
                        java.io.OutputStream output)
                 throws java.io.IOException

Copies the content of a InputStream into an OutputStream. Uses a default buffer size of 8024 bytes.

Parameters:

input - the InputStream to copy

output - the target Stream

Returns:

the number of bytes copied

Throws:

java.io.IOException - if an error occurs

copy

public static long copy(java.io.InputStream input,
                        java.io.OutputStream output,
                        int buffersize)
                 throws java.io.IOException

Copies the content of a InputStream into an OutputStream

Parameters:

input - the InputStream to copy

output - the target Stream

buffersize - the buffer size to use, must be bigger than 0

Returns:

the number of bytes copied

Throws:

java.io.IOException - if an error occurs

java.lang.IllegalArgumentException - if buffersize is smaller than or equal to 0

skip

public static long skip(java.io.InputStream input,
                        long numToSkip)
                 throws java.io.IOException

Skips the given number of bytes by repeatedly invoking skip on the given input stream if necessary.

In a case where the stream's skip() method returns 0 before the requested number of bytes has been skip this implementation will fall back to using the read() method.

This method will only skip less than the requested number of bytes if the end of the input stream has been reached.

Parameters:

input - stream to skip bytes in

numToSkip - the number of bytes to skip

Returns:

the number of bytes actually skipped

Throws:

java.io.IOException - on error

readFully

public static int readFully(java.io.InputStream input,
                            byte[] b)
                     throws java.io.IOException

Reads as much from input as possible to fill the given array.

This method may invoke read repeatedly to fill the array and only read less bytes than the length of the array if the end of the stream has been reached.

Parameters:

input - stream to read from

b - buffer to fill

Returns:

the number of bytes actually read

Throws:

java.io.IOException - on error

readFully

public static int readFully(java.io.InputStream input,
                            byte[] b,
                            int offset,
                            int len)
                     throws java.io.IOException

Reads as much from input as possible to fill the given array with the given amount of bytes.

This method may invoke read repeatedly to read the bytes and only read less bytes than the requested length if the end of the stream has been reached.

Parameters:

input - stream to read from

b - buffer to fill

offset - offset into the buffer to start filling at

len - of bytes to read

Returns:

the number of bytes actually read

Throws:

java.io.IOException - if an I/O error has occurred

readFully

public static void readFully(java.nio.channels.ReadableByteChannel channel,
                             java.nio.ByteBuffer b)
                      throws java.io.IOException

Reads b.remaining() bytes from the given channel starting at the current channel's position.

This method reads repeatedly from the channel until the requested number of bytes are read. This method blocks until the requested number of bytes are read, the end of the channel is detected, or an exception is thrown.

Parameters:

channel - the channel to read from

b - the buffer into which the data is read.

Throws:

java.io.IOException - - if an I/O error occurs.

java.io.EOFException - - if the channel reaches the end before reading all the bytes.

toByteArray

public static byte[] toByteArray(java.io.InputStream input)
                          throws java.io.IOException

Gets the contents of an InputStream as a byte[].

This method buffers the input internally, so there is no need to use a BufferedInputStream.

Parameters:

input - the InputStream to read from

Returns:

the requested byte array

Throws:

java.lang.NullPointerException - if the input is null

java.io.IOException - if an I/O error occurs

Since:

1.5

closeQuietly

public static void closeQuietly(java.io.Closeable c)

Closes the given Closeable and swallows any IOException that may occur.

Parameters:

c - Closeable to close, can be null

Since:

1.7