1 /* fitblk.c: example of fitting compressed output to a specified size
2    Not copyrighted -- provided to the public domain
8                      Use fixed-size, stack-allocated raw buffers
18    nearly the requested output block size.  The first pass generates
19    enough deflate blocks to produce output to fill the requested
20    output size plus a specified excess amount (see the EXCESS define
39    before filling the requested output size, then that compressed
76     unsigned char raw[RAWLEN];  in partcompress()  local
80         def->avail_in = fread(raw, 1, RAWLEN, in);  in partcompress()
83         def->next_in = raw;  in partcompress()
88     } while (def->avail_out != 0 && flush == Z_NO_FLUSH);  in partcompress()
92 /* recompress from inf's input to def's output; the input for inf and
93    the output for def are set in those structures before calling;
99     unsigned char raw[RAWLEN];  in recompress()  local
104         inf->avail_out = RAWLEN;  in recompress()
105         inf->next_out = raw;  in recompress()
113         def->avail_in = RAWLEN - inf->avail_out;  in recompress()
114         def->next_in = raw;  in recompress()
115         if (inf->avail_out != 0)  in recompress()
119     } while (ret != Z_STREAM_END && def->avail_out != 0);  in recompress()
126 /* compress from stdin to fixed-size block on stdout */
130     unsigned size;          /* requested fixed output block size */  in main()
136     /* get requested output size */  in main()
138         quit("need one argument: size of output block");  in main()
155     /* compress from stdin until output full, or no more input */  in main()
162     /* if it all fit, then size was undersubscribed -- done! */  in main()
165         have = size + EXCESS - def.avail_out;  in main()
167             quit("error writing output");  in main()
175                 size - have, size);  in main()
179     /* it didn't all fit -- set up for recompression */  in main()
208     inf.avail_in = size - MARGIN;   /* assure stream will complete */  in main()
217     /* done -- write block to stdout */  in main()
218     have = size - def.avail_out;  in main()
220         quit("error writing output");  in main()
231             size - have, size, def.total_in);  in main()