| java.lang.Object
 org.archive.io.GzipHeader
| GzipHeader | | public class GzipHeader (Code) | | Read in the GZIP header.
See RFC1952 for specification on what the header looks like.
Assumption is that stream is cued-up with the gzip header as the
next thing to be read.
Of Java
and unsigned bytes. That is, its always a signed int in
java no matter what the qualifier whether byte, char, etc.
Add accessors for optional filename, comment and MTIME.
author:
stack |
| Field Summary | |
| final public static int | MINIMAL_GZIP_HEADER_LENGTH
Length of minimal GZIP header. | | protected int | flg
The GZIP header FLG byte. | | protected int | length
Total length of the gzip header. |
| MINIMAL_GZIP_HEADER_LENGTH | | final public static int MINIMAL_GZIP_HEADER_LENGTH(Code) | | Length of minimal GZIP header.
See RFC1952 for explaination of value of 10.
|
| flg | | protected int flg(Code) | | The GZIP header FLG byte.
|
| length | | protected int length(Code) | | Total length of the gzip header.
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| GzipHeader | | public GzipHeader()(Code) | | Shutdown constructor.
Must pass an input stream.
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| GzipHeader | | public GzipHeader(InputStream in) throws IOException(Code) | | Constructor.
This constructor advances the stream past any gzip header found.
Parameters:
in - InputStream to read from.
throws:
IOException - |
| getFextra | | public byte[] getFextra()(Code) | | Returns the fextra. |
| getFlg | | public int getFlg()(Code) | | Returns the flg. |
| getLength | | public int getLength()(Code) | | Returns the length. |
| getMtime | | public int getMtime()(Code) | | Returns the mtime. |
| getOs | | public int getOs()(Code) | | Returns the os. |
| getXfl | | public int getXfl()(Code) | | Returns the xfl. |
| readByte | | protected int readByte(InputStream in) throws IOException(Code) | | Read a byte.
We do not expect to get a -1 reading. If we do, we throw exception.
Update the crc as we go.
Parameters:
in - InputStream to read. Byte read.
throws:
IOException - |
| readByte | | protected int readByte(InputStream in, CRC32 crc) throws IOException(Code) | | Read a byte.
We do not expect to get a -1 reading. If we do, we throw exception.
Update the crc as we go.
Parameters:
in - InputStream to read.
Parameters:
crc - CRC to update. Byte read.
throws:
IOException - |
| readByte | | protected int readByte(InputStream in, CRC32 crc, byte[] buffer, int offset, int length) throws IOException(Code) | | Read a byte.
We do not expect to get a -1 reading. If we do, we throw exception.
Update the crc as we go.
Parameters:
in - InputStream to read.
Parameters:
crc - CRC to update.
Parameters:
buffer - Buffer to read into.
Parameters:
offset - Offset to start filling buffer at.
Parameters:
length - How much to read. Bytes read.
throws:
IOException - |
| readHeader | | public void readHeader(InputStream in) throws IOException(Code) | | Read in gzip header.
Advances the stream past the gzip header.
Parameters:
in - InputStream.
throws:
IOException - Throws if does not start with GZIP Header. |
| testGzipMagic | | public boolean testGzipMagic(InputStream in) throws IOException(Code) | | Test gzip magic is next in the stream.
Reads two bytes. Caller needs to manage resetting stream.
Parameters:
in - InputStream to read. true if found gzip magic. False otherwiseor an IOException (including EOFException).
throws:
IOException - |
| testGzipMagic | | public boolean testGzipMagic(InputStream in, CRC32 crc) throws IOException(Code) | | Test gzip magic is next in the stream.
Reads two bytes. Caller needs to manage resetting stream.
Parameters:
in - InputStream to read.
Parameters:
crc - CRC to update. true if found gzip magic. False otherwiseor an IOException (including EOFException).
throws:
IOException - |
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