Shulou(Shulou.com)06/03 Report--

What are the basic functions in zlib? I believe many inexperienced people are at a loss about this. Therefore, this paper summarizes the causes and solutions of the problem. Through this article, I hope you can solve this problem.

Get version function: zlibVersion

Compression functions: deflateInit, deflate, deflateEnd

Decompression functions: inflateInit, inflate, inflateEnd

# include # include using namespace std;#define CHUNK 16384int def (FILE * source, FILE * dest, int level) {z_stream strm; strm.zalloc = Z null; strm.zfree = Z null; strm.opaque = Z null; deflateInit (& strm, level); int flush; int have; unsigned char in [CHUNK]; unsigned char out [CHUNK] Do {strm.avail_in = fread (in, 1, CHUNK, source); strm.next_in = in; flush = feof (source)? Z_FINISH: Zhuan NOAA flush; do {strm.avail_out = CHUNK; strm.next_out = out; deflate (& strm, flush); have = CHUNK-strm.avail_out Fwrite (out, 1, have, dest);} while (0 = = strm.avail_out);} while (Z_FINISH! = flush); deflateEnd (& strm); return Zero OK;} int inf (FILE * source, FILE * dest) {z_stream strm; strm.zalloc = Zero null; strm.zfree = Z_NULL Strm.opaque = Zero null; inflateInit (& strm); int ret = Zambiok; int have; unsigned char in [CHUNK]; unsigned char out [CHUNK]; do {strm.avail_in = fread (in, 1, CHUNK, source); strm.next_in = in If (0 = = strm.avail_in) break; do {strm.avail_out = CHUNK; strm.next_out = out; ret = inflate (& strm, Z_NO_FLUSH) Have = CHUNK-strm.avail_out; fwrite (out, 1, have, dest);} while (0 = = strm.avail_out);} while (Z_STREAM_END! = ret); inflateEnd (& strm); return Zerook;} void main (int argc, char * argv []) {cout

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.