Package org.apache.tools.tar
Class TarInputStream
java.lang.Object
java.io.InputStream
java.io.FilterInputStream
org.apache.tools.tar.TarInputStream
- All Implemented Interfaces:
Closeable,AutoCloseable
The TarInputStream reads a UNIX tar archive as an InputStream.
methods are provided to position at each successive entry in
the archive, and the read each entry as a normal input stream
using read().
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Field Summary
FieldsModifier and TypeFieldDescriptionprotected TarBufferprotected TarEntryprotected booleanprotected longprotected longprotected booleanprotected byte[]This contents of this array is not used at all in this class, it is only here to avoid repeated object creation during calls to the no-arg read method.protected byte[]Fields inherited from class java.io.FilterInputStream
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Constructor Summary
ConstructorsConstructorDescriptionConstructor for TarInputStream.TarInputStream(InputStream is, int blockSize) Constructor for TarInputStream.TarInputStream(InputStream is, int blockSize, int recordSize) Constructor for TarInputStream.TarInputStream(InputStream is, int blockSize, int recordSize, String encoding) Constructor for TarInputStream.TarInputStream(InputStream is, int blockSize, String encoding) Constructor for TarInputStream.TarInputStream(InputStream is, String encoding) Constructor for TarInputStream. -
Method Summary
Modifier and TypeMethodDescriptionintGet the available data that can be read from the current entry in the archive.booleanWhether this class is able to read the given entry.voidclose()Closes this stream.voidCopies the contents of the current tar archive entry directly into an output stream.protected byte[]Get the next entry in this tar archive as longname data.Get the next entry in this tar archive.intGet the record size being used by this stream's TarBuffer.voidmark(int markLimit) Since we do not support marking just yet, we do nothing.booleanSince we do not support marking just yet, we return false.intread()Reads a byte from the current tar archive entry.intread(byte[] buf, int offset, int numToRead) Reads bytes from the current tar archive entry.voidreset()Since we do not support marking just yet, we do nothing.voidsetDebug(boolean debug) Sets the debugging flag.longskip(long numToSkip) Skip bytes in the input buffer.Methods inherited from class java.io.FilterInputStream
readMethods inherited from class java.io.InputStream
nullInputStream, readAllBytes, readNBytes, readNBytes, skipNBytes, transferTo
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Field Details
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debug
protected boolean debug -
hasHitEOF
protected boolean hasHitEOF -
entrySize
protected long entrySize -
entryOffset
protected long entryOffset -
readBuf
protected byte[] readBuf -
buffer
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currEntry
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oneBuf
protected byte[] oneBufThis contents of this array is not used at all in this class, it is only here to avoid repeated object creation during calls to the no-arg read method.
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Constructor Details
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TarInputStream
Constructor for TarInputStream.- Parameters:
is- the input stream to use
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TarInputStream
Constructor for TarInputStream.- Parameters:
is- the input stream to useencoding- name of the encoding to use for file names
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TarInputStream
Constructor for TarInputStream.- Parameters:
is- the input stream to useblockSize- the block size to use
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TarInputStream
Constructor for TarInputStream.- Parameters:
is- the input stream to useblockSize- the block size to useencoding- name of the encoding to use for file names
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TarInputStream
Constructor for TarInputStream.- Parameters:
is- the input stream to useblockSize- the block size to userecordSize- the record size to use
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TarInputStream
Constructor for TarInputStream.- Parameters:
is- the input stream to useblockSize- the block size to userecordSize- the record size to useencoding- name of the encoding to use for file names
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Method Details
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setDebug
public void setDebug(boolean debug) Sets the debugging flag.- Parameters:
debug- True to turn on debugging.
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close
Closes this stream. Calls the TarBuffer's close() method.- Specified by:
closein interfaceAutoCloseable- Specified by:
closein interfaceCloseable- Overrides:
closein classFilterInputStream- Throws:
IOException- on error
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getRecordSize
public int getRecordSize()Get the record size being used by this stream's TarBuffer.- Returns:
- The TarBuffer record size.
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available
Get the available data that can be read from the current entry in the archive. This does not indicate how much data is left in the entire archive, only in the current entry. This value is determined from the entry's size header field and the amount of data already read from the current entry. Integer.MAX_VALUE is returned in case more than Integer.MAX_VALUE bytes are left in the current entry in the archive.- Overrides:
availablein classFilterInputStream- Returns:
- The number of available bytes for the current entry.
- Throws:
IOException- for signature
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skip
Skip bytes in the input buffer. This skips bytes in the current entry's data, not the entire archive, and will stop at the end of the current entry's data if the number to skip extends beyond that point.- Overrides:
skipin classFilterInputStream- Parameters:
numToSkip- The number of bytes to skip.- Returns:
- the number actually skipped
- Throws:
IOException- on error
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markSupported
public boolean markSupported()Since we do not support marking just yet, we return false.- Overrides:
markSupportedin classFilterInputStream- Returns:
- False.
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mark
public void mark(int markLimit) Since we do not support marking just yet, we do nothing.- Overrides:
markin classFilterInputStream- Parameters:
markLimit- The limit to mark.
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reset
public void reset()Since we do not support marking just yet, we do nothing.- Overrides:
resetin classFilterInputStream
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getNextEntry
Get the next entry in this tar archive. This will skip over any remaining data in the current entry, if there is one, and place the input stream at the header of the next entry, and read the header and instantiate a new TarEntry from the header bytes and return that entry. If there are no more entries in the archive, null will be returned to indicate that the end of the archive has been reached.- Returns:
- The next TarEntry in the archive, or null.
- Throws:
IOException- on error
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getLongNameData
Get the next entry in this tar archive as longname data.- Returns:
- The next entry in the archive as longname data, or null.
- Throws:
IOException- on error
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read
Reads a byte from the current tar archive entry. This method simply calls read(byte[], int, int).- Overrides:
readin classFilterInputStream- Returns:
- The byte read, or -1 at EOF.
- Throws:
IOException- on error
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read
Reads bytes from the current tar archive entry. This method is aware of the boundaries of the current entry in the archive and will deal with them as if they were this stream's start and EOF.- Overrides:
readin classFilterInputStream- Parameters:
buf- The buffer into which to place bytes read.offset- The offset at which to place bytes read.numToRead- The number of bytes to read.- Returns:
- The number of bytes read, or -1 at EOF.
- Throws:
IOException- on error
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copyEntryContents
Copies the contents of the current tar archive entry directly into an output stream.- Parameters:
out- The OutputStream into which to write the entry's data.- Throws:
IOException- on error
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canReadEntryData
Whether this class is able to read the given entry.May return false if the current entry is a sparse file.
- Parameters:
te- TarEntry- Returns:
- boolean
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