Deflating (Compressing) Data: deflate.ss

Compresses data to the same format as the GNU gzip utility, writing the compressed data directly to a file. The in-filename argument is the name of the file to compress. The default output file name is in-filename with .gz appended. If the file named by out-filename exists, it will be overwritten. The return value is void.

Reads the port in for data and compresses it to out, outputting the same format as the GNU gzip utility. The orig-filename string is embedded in this output; orig-filename can be #f to omit the filename from the compressed stream. The timestamp number is also embedded in the output stream, as the modification date of the original file (in Unix seconds, as file-or-directory-modify-seconds would report under Unix). The return value is void.

Writes pkzip-format ``deflated'' data to the port out, compressing data from the port in. The data in a file created by gzip uses this format (preceded with some header information). The return value is void.