org.archive.format.gzip

Class GZIPDecoder

java.lang.Object

org.archive.format.gzip.GZIPDecoder

All Implemented Interfaces:

GZIPConstants

public class GZIPDecoder
extends java.lang.Object
implements GZIPConstants

Field Summary

Fields

Modifier and Type	Field and Description
static long	SEARCH_EOF_AT_START

Fields inherited from interface org.archive.format.gzip.GZIPConstants

BYTES_IN_INT, BYTES_IN_SHORT, GZIP_COMPRESSION_METHOD_DEFLATE, GZIP_COMPRESSION_METHOD_IDX, GZIP_FEXTRA_LENGTH_BYTES, GZIP_FEXTRA_LENGTH_IDX, GZIP_FEXTRA_NAME_BYTES, GZIP_FEXTRA_NAME_IDX, GZIP_FEXTRA_VALUE_IDX, GZIP_FEXTRA_VALUE_MAX_LENGTH, GZIP_FLAG_FCOMMENT, GZIP_FLAG_FEXTRA, GZIP_FLAG_FHCRC, GZIP_FLAG_FNAME, GZIP_FLAG_FTEXT, GZIP_FLAG_IDX, GZIP_FLAG_VALID_BITS, GZIP_FOOTER_BYTES, GZIP_MAGIC_ONE, GZIP_MAGIC_ONE_IDX, GZIP_MAGIC_TWO, GZIP_MAGIC_TWO_IDX, GZIP_MTIME_IDX, GZIP_MTIME_LENGTH, GZIP_OS_IDX, GZIP_OS_UNIX, GZIP_STATIC_FOOTER_SIZE, GZIP_STATIC_HEADER_SIZE, GZIP_XFL_IDX, LX_RECORD, LX_RECORD_VALUE, NO_BYTES_IN_STREAM, SL_RECORD

Constructor Summary

Constructors

Constructor and Description
GZIPDecoder()
GZIPDecoder(int max)
GZIPDecoder(int maxNameSize, int maxCommentSize)

Method Summary

Modifier and Type	Method and Description
boolean	alignedAtEOF(long skipped)
long	alignOnMagic3(java.io.InputStream is) Read bytes from InputStream argument until 3 bytes are found that appear to be the start of a GZIPHeader.
GZIPHeader	parseHeader(java.io.InputStream origIn)
GZIPHeader	parseHeader(java.io.InputStream origIn, boolean assume1st3)

Methods inherited from class java.lang.Object

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

Field Detail

SEARCH_EOF_AT_START

public static final long SEARCH_EOF_AT_START

See Also:

Constant Field Values

Constructor Detail

GZIPDecoder

public GZIPDecoder()

GZIPDecoder

public GZIPDecoder(int max)

GZIPDecoder

public GZIPDecoder(int maxNameSize,
                   int maxCommentSize)

Method Detail

alignedAtEOF

public boolean alignedAtEOF(long skipped)

alignOnMagic3

public long alignOnMagic3(java.io.InputStream is)
                   throws java.io.IOException

Read bytes from InputStream argument until 3 bytes are found that appear to be the start of a GZIPHeader. leave the stream on the 4th byte, and return the number of bytes skipped before finding the 3 bytes.

Parameters:

is - InputStream to read from

Returns:

number of bytes skipped before finding the gzip magic: 0 if the first 3 bytes matched. If no magic was found before an EOF, returns the -1 * the number of bytes skipped before hitting the EOF. As a special case, if the stream was at EOF when the method is called, returns GZIPHeaderParser.SEARCH_EOF_AT_START (which is Long.MIN_VALUE)

Throws:

java.io.IOException

parseHeader

public GZIPHeader parseHeader(java.io.InputStream origIn)
                       throws GZIPFormatException,
                              java.io.IOException

Throws:

GZIPFormatException

java.io.IOException

parseHeader

public GZIPHeader parseHeader(java.io.InputStream origIn,
                              boolean assume1st3)
                       throws GZIPFormatException,
                              java.io.IOException

Throws:

GZIPFormatException

java.io.IOException