The compress2() function shall attempt to compress
sourceLen bytes of data in the buffer
source, placing the result in the buffer
dest, at the level described by
The level supplied shall be a value between
9, or the value
Z_DEFAULT_COMPRESSION. A level
1 requests the highest speed, while a level
9 requests the highest compression.
A level of
0 indicates that no
compression should be used, and the output shall be the same as the input.
On entry, destLen should point to a value describing the size of the dest buffer. The application should ensure that this value be at least (sourceLen × 1.001) + 12. On successful exit, the variable referenced by destLen shall be updated to hold the length of compressed data in dest.
The compress() function is equivalent to
compress2() with a level of
On success, compress2() shall return Z_OK. Otherwise, compress2() shall return a value to indicate the error.
On error, compress2() shall return a value as described below:
The buffer dest was not large enough to hold the compressed data.
The level was not