| /* deflate_huff.c -- compress data using huffman encoding only strategy |
| * |
| * Copyright (C) 1995-2013 Jean-loup Gailly and Mark Adler |
| * For conditions of distribution and use, see copyright notice in zlib.h |
| */ |
| |
| #include "zbuild.h" |
| #include "deflate.h" |
| #include "deflate_p.h" |
| #include "functable.h" |
| |
| /* =========================================================================== |
| * For Z_HUFFMAN_ONLY, do not look for matches. Do not maintain a hash table. |
| * (It will be regenerated if this run of deflate switches away from Huffman.) |
| */ |
| Z_INTERNAL block_state deflate_huff(deflate_state *s, int flush) { |
| int bflush = 0; /* set if current block must be flushed */ |
| |
| for (;;) { |
| /* Make sure that we have a literal to write. */ |
| if (s->lookahead == 0) { |
| PREFIX(fill_window)(s); |
| if (s->lookahead == 0) { |
| if (flush == Z_NO_FLUSH) |
| return need_more; |
| break; /* flush the current block */ |
| } |
| } |
| |
| /* Output a literal byte */ |
| bflush = zng_tr_tally_lit(s, s->window[s->strstart]); |
| s->lookahead--; |
| s->strstart++; |
| if (bflush) |
| FLUSH_BLOCK(s, 0); |
| } |
| s->insert = 0; |
| if (flush == Z_FINISH) { |
| FLUSH_BLOCK(s, 1); |
| return finish_done; |
| } |
| if (s->sym_next) |
| FLUSH_BLOCK(s, 0); |
| return block_done; |
| } |