io - How to write gz file in C via zlib and compress2 -


i'm using zlib write program compress data in several threads. can't use gzwrite. i'm using compress2().

*dest_len = compressbound(log_buff_sz); err = compress2((bytef*)compressed_buff->buff, dest_len, (bytef*)b->buff, size, gz_int_compression_level); write(fd, compressed_buff->buff, compressed_buff->full);

but when try decompress file via gzip -d see next output: "not in gzip format". doing wrong? thank answers

compress() , compress2() compress zlib format, not gzip format. need use lower-level functions able select gzip format. deflateinit2(), deflate() , deflateend(). read documentation in zlib.h functions. after that, should @ heavily documented example of use.


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