Zlib library function - compress()














































Zlib library function - compress()



In the previous article we have discussed about zlib python library and its functions. If you have not gone through the previous article then check out through this link javascript:nicTemp();
Now, in this article ,I am going to discuss "compress()" which is zlib function.
INTRODUCTION
Compresses the data in string, returning a string contained compressed data. level is an integer from 0 to 9 controlling the level of compression; 1 is fastest and produces the least compression, 9 is slowest and produces the most. 0 is no compression. The default value is 6. Raises the error exception if any error occurs.
The compress() is a utility functions of zlib library that are implemented on top of the basic stream-oriented functions. To simplify the interface, some default options are assumed (compression level and memory usage, standard memory allocation functions). The source code of these utility functions can easily be modified if you need special options.

ZEXTERN int ZEXPORT compress OF((Bytef *dest, uLongf *destLen,
                                 const Bytef *source, uLong sourceLen));
Compresses the source buffer into the destination buffer. sourceLen is the byte length of the source buffer. Upon entry, destLen is the total size of the destination buffer, which must be at least the value returned by compressBound(sourceLen). Upon exit, destLen is the actual size of the compressed data. compress() is equivalent to compress2() with a level parameter of Z_DEFAULT_COMPRESSION.

compress returns Z_OK if success, Z_MEM_ERROR if there was not enough memory, Z_BUF_ERROR if there was not enough room in the output buffer.
This article is just to give a brief idea about zlib function which is compress().In next article we will discuss next zlib function.


Comments