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45 lines
1.4 KiB
45 lines
1.4 KiB
/* deflate_huff.c -- compress data using huffman encoding only strategy |
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* |
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* Copyright (C) 1995-2024 Jean-loup Gailly and Mark Adler |
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* For conditions of distribution and use, see copyright notice in zlib.h |
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*/ |
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#include "zbuild.h" |
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#include "deflate.h" |
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#include "deflate_p.h" |
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#include "functable.h" |
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/* =========================================================================== |
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* For Z_HUFFMAN_ONLY, do not look for matches. Do not maintain a hash table. |
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* (It will be regenerated if this run of deflate switches away from Huffman.) |
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*/ |
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Z_INTERNAL block_state deflate_huff(deflate_state *s, int flush) { |
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int bflush = 0; /* set if current block must be flushed */ |
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for (;;) { |
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/* Make sure that we have a literal to write. */ |
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if (s->lookahead == 0) { |
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PREFIX(fill_window)(s); |
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if (s->lookahead == 0) { |
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if (flush == Z_NO_FLUSH) |
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return need_more; |
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break; /* flush the current block */ |
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} |
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} |
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/* Output a literal byte */ |
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bflush = zng_tr_tally_lit(s, s->window[s->strstart]); |
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s->lookahead--; |
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s->strstart++; |
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if (bflush) |
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FLUSH_BLOCK(s, 0); |
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} |
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s->insert = 0; |
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if (flush == Z_FINISH) { |
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FLUSH_BLOCK(s, 1); |
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return finish_done; |
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} |
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if (s->sym_next) |
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FLUSH_BLOCK(s, 0); |
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return block_done; |
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}
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