io.apigee.trireme.kernel.util

Class GZipHeader

java.lang.Object

io.apigee.trireme.kernel.util.GZipHeader

public class GZipHeader
extends Object

This class generates and parses a GZip header for use by the zlib module.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	GZipHeader.Magic
static class	GZipHeader.Trailer

Field Summary

Fields

Modifier and Type	Field and Description
static byte	BEST_COMPRESSION
static byte	FAST_COMPRESSION
static int	FCOMMENT
static int	FHCRC
static int	FHEXTRA
static int	FNAME
static int	HEADER_SIZE
static byte	MAGIC_1
static byte	MAGIC_2
static byte	METHOD_INFLATE
static int	TRAILER_SIZE
static byte	UNIX

Constructor Summary

Constructors

Constructor and Description
GZipHeader()

Method Summary

Methods

Modifier and Type	Method and Description
String	getComment()
int	getCompressionLevel()
String	getFileName()
long	getTimestamp()
static GZipHeader	load(ByteBuffer buf) Parse the buffer.
static GZipHeader.Magic	peekMagicNumber(ByteBuffer buf)
static GZipHeader.Trailer	readGZipTrailer(ByteBuffer buf)
void	setComment(String comment)
void	setCompressionLevel(int compressionLevel)
void	setFileName(String fileName)
void	setTimestamp(long timestamp)
ByteBuffer	store()
static ByteBuffer	writeGZipTrailer(long checksum, long bytesRead)

Methods inherited from class java.lang.Object

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

Field Detail

HEADER_SIZE

public static final int HEADER_SIZE

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Constant Field Values

TRAILER_SIZE

public static final int TRAILER_SIZE

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Constant Field Values

MAGIC_1

public static final byte MAGIC_1

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Constant Field Values

MAGIC_2

public static final byte MAGIC_2

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Constant Field Values

METHOD_INFLATE

public static final byte METHOD_INFLATE

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Constant Field Values

UNIX

public static final byte UNIX

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Constant Field Values

BEST_COMPRESSION

public static final byte BEST_COMPRESSION

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Constant Field Values

FAST_COMPRESSION

public static final byte FAST_COMPRESSION

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Constant Field Values

FHCRC

public static final int FHCRC

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Constant Field Values

FHEXTRA

public static final int FHEXTRA

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Constant Field Values

FNAME

public static final int FNAME

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Constant Field Values

FCOMMENT

public static final int FCOMMENT

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Constant Field Values

Constructor Detail

GZipHeader

public GZipHeader()

Method Detail

getTimestamp

public long getTimestamp()

setTimestamp

public void setTimestamp(long timestamp)

getCompressionLevel

public int getCompressionLevel()

setCompressionLevel

public void setCompressionLevel(int compressionLevel)

getFileName

public String getFileName()

setFileName

public void setFileName(String fileName)

getComment

public String getComment()

setComment

public void setComment(String comment)

store

public ByteBuffer store()

peekMagicNumber

public static GZipHeader.Magic peekMagicNumber(ByteBuffer buf)

load

public static GZipHeader load(ByteBuffer buf)
                       throws DataFormatException

Parse the buffer. If it is a real GZip header, return the new object and leave the position at the end of the header. Otherwise, leave the buffer position where it was and return null;

Throws:

DataFormatException

readGZipTrailer

public static GZipHeader.Trailer readGZipTrailer(ByteBuffer buf)
                                          throws DataFormatException

Throws:

DataFormatException

writeGZipTrailer

public static ByteBuffer writeGZipTrailer(long checksum,
                          long bytesRead)