lib/zlib/deflate.c

114  * the desired pack level (0..9). The values given below have been tuned to
172  * If this file is compiled with -DFASTEST, the compression level is forced
199 int ZEXPORT deflateInit_(strm, level, stream_size)
201     int level;
204     return deflateInit2_(strm, level, Z_DEFLATED, MAX_WBITS, DEF_MEM_LEVEL,
210 int ZEXPORT deflateInit2_(strm, level, method, windowBits, memLevel, strategy,
213     int  level;
233     if (level != 0) level = 1;
235     if (level == Z_DEFAULT_COMPRESSION) level = 6;
249         windowBits < 8 || windowBits > 15 || level < 0 || level > 9 ||
334     s->level = level;
443 int ZEXPORT deflateParams(strm, level, strategy)
445     int level;
456     if (level != 0) level = 1;
458     if (level == Z_DEFAULT_COMPRESSION) level = 6;
460     if (level < 0 || level > 9 || strategy < 0 || strategy > Z_FIXED) {
463     func = configuration_table[s->level].func;
465     if ((strategy != s->strategy || func != configuration_table[level].func) &&
470     if (s->level != level) {
471         s->level = level;
472         s->max_lazy_match   = configuration_table[level].max_lazy;
473         s->good_match       = configuration_table[level].good_length;
474         s->nice_match       = configuration_table[level].nice_length;
475         s->max_chain_length = configuration_table[level].max_chain;
649                 put_byte(s, s->level == 9 ? 2 :
650                             (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2 ?
666                 put_byte(s, s->level == 9 ? 2 :
667                             (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2 ?
687             if (s->strategy >= Z_HUFFMAN_ONLY || s->level < 2)
689             else if (s->level < 6)
691             else if (s->level == 6)
851                         (*(configuration_table[s->level].func))(s, flush));
1057     s->max_lazy_match   = configuration_table[s->level].max_lazy;
1058     s->good_match       = configuration_table[s->level].good_length;
1059     s->nice_match       = configuration_table[s->level].nice_length;
1060     s->max_chain_length = configuration_table[s->level].max_chain;
1366                at the expense of memory usage). We slide even when level == 0
1367                to keep the hash table consistent if we switch back to level > 0
1368                later. (Using level 0 permanently is not an optimal usage of
1484  * only for the level=0 compression option.