Library: Foundation
Package: Streams
Header: Poco/InflatingStream.h
Description
This is the streambuf class used by InflatingInputStream and InflatingOutputStream. The actual work is delegated to zlib (see http://zlib.net). Both zlib (deflate) streams and gzip streams are supported. Output streams should always call close() to ensure proper completion of decompression.
Inheritance
Direct Base Classes: BufferedStreamBuf
All Base Classes: BufferedStreamBuf
Member Summary
Member Functions: close, readFromDevice, reset, sync, writeToDevice
Enumerations
StreamType
Expect a zlib header, use Adler-32 checksum.
Expect a gzip header, use CRC-32 checksum.
STREAM_ZIP is handled as STREAM_ZLIB, except that we do not check the ADLER32 value (must be checked by caller)
Constructors
InflatingStreamBuf
InflatingStreamBuf(
std::istream & istr,
StreamType type
);
Creates an InflatingStreamBuf for expanding the compressed data read from the give input stream.
InflatingStreamBuf
InflatingStreamBuf(
std::istream & istr,
int windowBits
);
Creates an InflatingStreamBuf for expanding the compressed data read from the given input stream.
Please refer to the zlib documentation of inflateInit2() for a description of the windowBits parameter.
InflatingStreamBuf
InflatingStreamBuf(
std::ostream & ostr,
StreamType type
);
Creates an InflatingStreamBuf for expanding the compressed data passed through and forwarding it to the given output stream.
InflatingStreamBuf
InflatingStreamBuf(
std::ostream & ostr,
int windowBits
);
Creates an InflatingStreamBuf for expanding the compressed data passed through and forwarding it to the given output stream.
Please refer to the zlib documentation of inflateInit2() for a description of the windowBits parameter.
Destructor
~InflatingStreamBuf
Destroys the InflatingStreamBuf.
Member Functions
close
int close();
Finishes up the stream.
Must be called when inflating to an output stream.
reset
void reset();
Resets the stream buffer.
readFromDevice 
int readFromDevice(
char * buffer,
std::streamsize length
);
sync
int sync();
writeToDevice
int writeToDevice(
const char * buffer,
std::streamsize length
);