GZIPInputStream

Class Overview

The GZIPInputStream class is used to read data stored in the GZIP format, reading and decompressing GZIP data from the underlying stream into its buffer.

Example

Using GZIPInputStream is easier than ZipInputStream because GZIP is only for compression, and is not a container for multiple files. This code decompresses the data from a GZIP stream, similar to the gunzip(1) utility.

 InputStream is = ...
 GZIPInputStream zis = new GZIPInputStream(new BufferedInputStream(is));
 try {
     // Reading from 'zis' gets you the uncompressed bytes...
     processStream(zis);
 } finally {
     zis.close();
 }
 

Note that this class ignores all remaining data at the end of the last GZIP member.

Summary

[Expand] Inherited Fields
From class java.util.zip.InflaterInputStream protected byte[] buf The input buffer used for decompression. protected Inflater inf The inflater used for this stream. protected int len The length of the buffer.
From class java.io.FilterInputStream protected InputStream in The source input stream that is filtered.

[Expand] Inherited Methods
From class java.util.zip.InflaterInputStream int available() Returns 0 when when this stream has exhausted its input; and 1 otherwise. void close() Closes the input stream. void fill() Fills the input buffer with data to be decompressed. void mark(int readlimit) Marks the current position in the stream. boolean markSupported() Returns whether the receiver implements mark semantics. int read() Reads a single byte of decompressed data. int read(byte[] buffer, int byteOffset, int byteCount) Reads up to byteCount bytes of decompressed data and stores it in buffer starting at byteOffset. void reset() This operation is not supported and throws IOException. long skip(long byteCount) Skips up to byteCount bytes of uncompressed data.
From class java.io.FilterInputStream int available() Returns an estimated number of bytes that can be read or skipped without blocking for more input. void close() Closes this stream. synchronized void mark(int readlimit) Sets a mark position in this stream. boolean markSupported() Indicates whether this stream supports mark() and reset(). int read() Reads a single byte from the filtered stream and returns it as an integer in the range from 0 to 255. int read(byte[] buffer, int byteOffset, int byteCount) Reads up to byteCount bytes from this stream and stores them in the byte array buffer starting at byteOffset. synchronized void reset() Resets this stream to the last marked location. long skip(long byteCount) Skips byteCount bytes in this stream.
From class java.io.InputStream int available() Returns an estimated number of bytes that can be read or skipped without blocking for more input. void close() Closes this stream. void mark(int readlimit) Sets a mark position in this InputStream. boolean markSupported() Indicates whether this stream supports the mark() and reset() methods. int read(byte[] buffer) Equivalent to read(buffer, 0, buffer.length). abstract int read() Reads a single byte from this stream and returns it as an integer in the range from 0 to 255. int read(byte[] buffer, int byteOffset, int byteCount) Reads up to byteCount bytes from this stream and stores them in the byte array buffer starting at byteOffset. synchronized void reset() Resets this stream to the last marked location. long skip(long byteCount) Skips at most byteCount bytes in this stream.
From class java.lang.Object Object clone() Creates and returns a copy of this Object. boolean equals(Object o) Compares this instance with the specified object and indicates if they are equal. void finalize() Invoked when the garbage collector has detected that this instance is no longer reachable. final Class<?> getClass() Returns the unique instance of Class that represents this object's class. int hashCode() Returns an integer hash code for this object. final void notify() Causes a thread which is waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up. final void notifyAll() Causes all threads which are waiting on this object's monitor (by means of calling one of the wait() methods) to be woken up. String toString() Returns a string containing a concise, human-readable description of this object. final void wait() Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object. final void wait(long millis, int nanos) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires. final void wait(long millis) Causes the calling thread to wait until another thread calls the notify() or notifyAll() method of this object or until the specified timeout expires.
From interface java.io.Closeable abstract void close() Closes the object and release any system resources it holds.
From interface java.lang.AutoCloseable abstract void close() Closes the object and release any system resources it holds.