Version 5.0 The LEDA User Manual

9.4 Deflation/Inflation Coder ( DeflateCoder )
1. Definition
The class DeflateCoder encapsulates the algorithms “deflation” and “inflation” from the
zlib-library by J.-L. Gilly and M. Adler (see www.zlib.org).
Both algorithms use two buffers (for encoded and decoded data). The user can control
the size of each buffer. In addition he can fine-tune some parameters of the algorithm,
which gives him a trade-off between compression rate and speed.
This coder is fast, gives good compression rates and has moderate memory requirements.
#include < LEDA/coding/deflate.h >
2. Creation
DeflateCoder C(streambuf ∗ src stream = 0, streambuf ∗ tgt stream = 0,
bool own streams = false, uint32 enc buffer sz = DefaultBufferSize,
uint32 dec buffer sz = DefaultBufferSize);
creates an instance C which uses the given source and target
streams. If own streams is set, then C is responsible for the destruction
of the streams, otherwise the pointers src stream and tgt stream
must be valid during the life-time of C. (In addition the sizes of
the two buffers may be specified.)
DeflateCoder
C(const char ∗ src file name, const char ∗ tgt file name,
uint32 enc buffer sz = DefaultBufferSize,
uint32 dec buffer sz = DefaultBufferSize);
creates an instance C which uses file-streams for input and output.
(In addition the sizes of the two buffers may be specified.)
3. Operations
Standard Operations
void C.encode( ) encodes the source stream and writes the output to
the target stream.
void C.decode( ) decodes the source stream and writes the output to
the target stream.