public class GZIPOutputStream extends DeflaterOutputStream
This class implements a stream filter for writing compressed data in the GZIP file format.
protected CRC32 crc
CRC-32 of uncompressed data.
public GZIPOutputStream(OutputStream out, int size) throws IOException
Creates a new output stream with the specified buffer size.
The new output stream instance is created as if by invoking the 3-argument constructor GZIPOutputStream(out, size, false).
out
- the output streamsize
- the output buffer sizeIOException
- If an I/O error has occurred.IllegalArgumentException
- if size <= 0
public GZIPOutputStream(OutputStream out, int size, boolean syncFlush) throws IOException
Creates a new output stream with the specified buffer size and flush mode.
out
- the output streamsize
- the output buffer sizesyncFlush
- if true
invocation of the inherited flush()
method of this instance flushes the compressor with flush mode Deflater.SYNC_FLUSH
before flushing the output stream, otherwise only flushes the output streamIOException
- If an I/O error has occurred.IllegalArgumentException
- if size <= 0
public GZIPOutputStream(OutputStream out) throws IOException
Creates a new output stream with a default buffer size.
The new output stream instance is created as if by invoking the 2-argument constructor GZIPOutputStream(out, false).
out
- the output streamIOException
- If an I/O error has occurred.public GZIPOutputStream(OutputStream out, boolean syncFlush) throws IOException
Creates a new output stream with a default buffer size and the specified flush mode.
out
- the output streamsyncFlush
- if true
invocation of the inherited flush()
method of this instance flushes the compressor with flush mode Deflater.SYNC_FLUSH
before flushing the output stream, otherwise only flushes the output streamIOException
- If an I/O error has occurred.public void write(byte[] buf, int off, int len) throws IOException
Writes array of bytes to the compressed output stream. This method will block until all the bytes are written.
write
in class DeflaterOutputStream
buf
- the data to be writtenoff
- the start offset of the datalen
- the length of the dataIOException
- If an I/O error has occurred.FilterOutputStream.write(int)
public void finish() throws IOException
Finishes writing compressed data to the output stream without closing the underlying stream. Use this method when applying multiple filters in succession to the same output stream.
finish
in class DeflaterOutputStream
IOException
- if an I/O error has occurred
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