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Chapter 18 The java.util.zip Package |
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Chapter 18 The java.util.zip Package |
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java.util.zip.GZIPInputStream
java.util.zip.InflaterInputStream
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New as of JDK 1.1
The GZIPInputStream class decompresses data that has been compressed using the GZIP format. To use it, simply construct a GZIPInputStream that wraps regular input stream and use the read() methods to read the compressed data.
public class java.util.zip.GZIPInputStream
extends java.util.zip.InflaterInputStream {
// Constants
public static final int GZIP_MAGIC;
// Variables
protected CRC32 crc;
protected boolean eos;
// Constructors
public GZIPInputStream(InputStream in);
public GZIPInputStream(InputStream in, int size);
// Instance Methods
public void close();
public int read(byte[] buf, int off, int len);
}
A constant that contains the "magic number" that appears in the header of GZIP files.
A checksum value of the uncompressed data. When an entire file has been read, this checksum is compared to a value stored in the GZIP trailer. If the values do not match, an exception is thrown from read().
A flag that indicates whether or not the end of the compressed stream has been reached. It is set to true when the compressed data and the GZIP trailer have been read.
The underlying input stream.
If an error occurs while reading the GZIP header.
This constructor creates a GZIPInputStream that inflates data from the given InputStream. The GZIPInputStream uses a decompression buffer with the default size of 512 bytes. The GZIP header is read immediately.
public GZIPInputStream(InputStream in, int size) throws IOException
The underlying input stream.
The size of the input buffer.
If an error occurs while reading the GZIP header.
This constructor creates a GZIPInputStream that inflates data from the given InputStream. The GZIPInputStream uses a decompression buffer of the given size. The GZIP header is read immediately.
If any kind of I/O error occurs.
FilterInputStream.close()
This method closes this stream and releases any system resources that are associated with it.
An array of bytes to be filled from the stream.
An offset into the byte array.
The number of bytes to read.
The number of bytes read or -1 if the end of the stream is encountered immediately.
If any kind of I/O error occurs or the checksum of the uncompressed data does not match that in the GZIP trailer.
InflaterInputStream.read(byte[], int, int)
This method reads enough data from the underlying InputStream to return len bytes of uncompressed data. The uncompressed data is placed into the given array starting at off. The method blocks until some data is available for decompression.
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Method |
Inherited From |
Method |
Inherited From |
|---|---|---|---|
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available() |
FilterInputStream |
clone() |
Object |
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equals(Object) |
Object |
finalize() |
Object |
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getClass() |
Object |
hashCode() |
Object |
|
mark(int) |
FilterInputStream |
markSupported() |
FilterInputStream |
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notify() |
Object |
notifyAll() |
Object |
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read() |
InflaterInputStream |
read(byte[]) |
FilterInputStream |
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reset() |
FilterInputStream |
skip(long) |
InflaterInputStream |
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toString() |
Object |
wait() |
Object |
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wait(long) |
Object |
wait(long, int) |
Object |
FilterInputStream, Inflater, InflaterInputStream, InputStream, IOException
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| DeflaterOutputStream |  |
GZIPOutputStream |
