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()
Gets the amount of raw or compressed bytes read by the stream.
|
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 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()
InputStreamStatisticsgetCompressedCount in interface InputStreamStatisticspublic 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.IOExceptionCopyright © 2010 - 2024 Adobe. All Rights Reserved