public class GzipCompressorInputStream extends CompressorInputStream implements InputStreamStatistics
This supports decompressing concatenated .gz files which is important when decompressing standalone .gz files.
GZIPInputStream doesn't decompress concatenated .gz
files: it stops after the first member and silently ignores the rest.
It doesn't leave the read position to point to the beginning of the next
member, which makes it difficult workaround the lack of concatenation
support.
Instead of using GZIPInputStream, this class has its own .gz
container format decoder. The actual decompression is done with
Inflater.
If you use the constructor GzipCompressorInputStream(in)
or GzipCompressorInputStream(in, false) with some InputStream in then read() will return -1 as soon
as the first internal member has been read completely. The stream
in will be positioned at the start of the second gzip
member if there is one.
If you use the constructor GzipCompressorInputStream(in,
true) with some InputStream in then read()
will return -1 once the stream in has been exhausted. The
data read from a stream constructed this way will consist of the
concatenated data of all gzip members contained inside in.
| Constructor and Description |
|---|
GzipCompressorInputStream(java.io.InputStream inputStream)
Constructs a new input stream that decompresses gzip-compressed data
from the specified input stream.
|
GzipCompressorInputStream(java.io.InputStream inputStream,
boolean decompressConcatenated)
Constructs a new input stream that decompresses gzip-compressed data
from the specified input stream.
|
| Modifier and Type | Method and Description |
|---|---|
void |
close()
Closes the input stream (unless it is System.in).
|
long |
getCompressedCount() |
GzipParameters |
getMetaData()
Provides the stream's meta data - may change with each stream
when decompressing concatenated streams.
|
static boolean |
matches(byte[] signature,
int length)
Checks if the signature matches what is expected for a .gz file.
|
int |
read() |
int |
read(byte[] b,
int off,
int len) |
getBytesRead, getCount, getUncompressedCountequals, getClass, hashCode, notify, notifyAll, toString, wait, wait, waitgetUncompressedCountpublic GzipCompressorInputStream(java.io.InputStream inputStream)
throws java.io.IOException
This is equivalent to
GzipCompressorInputStream(inputStream, false) and thus
will not decompress concatenated .gz files.
inputStream - the InputStream from which this object should
be created ofjava.io.IOException - if the stream could not be createdpublic GzipCompressorInputStream(java.io.InputStream inputStream,
boolean decompressConcatenated)
throws java.io.IOException
If decompressConcatenated is false:
This decompressor might read more input than it will actually use.
If inputStream supports mark and
reset, then the input position will be adjusted
so that it is right after the last byte of the compressed stream.
If mark isn't supported, the input position will be
undefined.
inputStream - the InputStream from which this object should
be created ofdecompressConcatenated - if true, decompress until the end of the input;
if false, stop after the first .gz memberjava.io.IOException - if the stream could not be createdpublic GzipParameters getMetaData()
public int read()
throws java.io.IOException
read in class java.io.InputStreamjava.io.IOExceptionpublic int read(byte[] b,
int off,
int len)
throws java.io.IOException
read in class java.io.InputStreamjava.io.IOExceptionpublic static boolean matches(byte[] signature,
int length)
signature - the bytes to checklength - the number of bytes to checkpublic void close()
throws java.io.IOException
close in interface java.io.Closeableclose in interface java.lang.AutoCloseableclose in class java.io.InputStreamjava.io.IOExceptionpublic long getCompressedCount()
getCompressedCount in interface InputStreamStatisticsCopyright © 2010 - 2020 Adobe. All Rights Reserved