Lines Matching refs:tree
315 ush dad; /* father node in Huffman tree */
328 ct_data *dyn_tree; /* the dynamic tree */
330 static_tree_desc *stat_desc; /* the corresponding static tree */
438 struct ct_data_s dyn_ltree[HEAP_SIZE]; /* literal and length tree */
439 struct ct_data_s dyn_dtree[2*D_CODES+1]; /* distance tree */
440 struct ct_data_s bl_tree[2*BL_CODES+1]; /* Huffman tree for bit lengths */
442 struct tree_desc_s l_desc; /* desc. for literal tree */
443 struct tree_desc_s d_desc; /* desc. for distance tree */
444 struct tree_desc_s bl_desc; /* desc. for bit length tree */
447 /* number of codes at each bit length for an optimal tree */
1846 * Each code tree is stored in a compressed form which is itself
1918 /* The static literal tree. Since the bit lengths are imposed, there is no
1920 * The codes 286 and 287 are needed to build a canonical tree (see _tr_init
1925 /* The static distance tree. (Actually a trivial tree since all codes use
1945 ct_data *static_tree; /* static tree or NULL */
1948 int elems; /* max number of elements in the tree */
1967 local void pqdownheap OF((deflate_state *s, ct_data *tree, int k));
1969 local void gen_codes OF((ct_data *tree, int max_code, ushf *bl_count));
1971 local void scan_tree OF((deflate_state *s, ct_data *tree, int max_code));
1972 local void send_tree OF((deflate_state *s, ct_data *tree, int max_code));
1986 # define send_code(s, c, tree) send_bits(s, tree[c].Code, tree[c].Len)
1987 /* Send a code of the given tree. c and tree must not have side effects */
1990 # define send_code(s, c, tree) \
1992 send_bits(s, tree[c].Code, tree[c].Len); }
2070 int n; /* iterates over tree elements */
2076 /* number of codes at each bit length for an optimal tree */
2113 /* Construct the codes of the static literal tree */
2121 * tree construction to get a canonical Huffman tree (longest code
2126 /* The static distance tree is trivial: */
2135 * Initialize the tree data structures for a new zlib stream.
2170 int n; /* iterates over tree elements */
2183 /* Index within the heap array of least frequent node in the Huffman tree */
2190 #define pqremove(s, tree, top) \
2194 pqdownheap(s, tree, SMALLEST); \
2198 * Compares to subtrees, using the tree depth as tie breaker when
2201 #define smaller(tree, n, m, depth) \
2202 (tree[n].Freq < tree[m].Freq || \
2203 (tree[n].Freq == tree[m].Freq && depth[n] <= depth[m]))
2206 * Restore the heap property by moving down the tree starting at node k,
2211 local void pqdownheap(s, tree, k)
2213 ct_data *tree; /* the tree to restore */
2221 smaller(tree, s->heap[j+1], s->heap[j], s->depth)) {
2225 if (smaller(tree, v, s->heap[j], s->depth)) break;
2230 /* And continue down the tree, setting j to the left son of k */
2237 * Compute the optimal bit lengths for a tree and update the total bit length
2240 * above are the tree nodes sorted by increasing frequency.
2248 tree_desc *desc; /* the tree descriptor */
2250 ct_data *tree = desc->dyn_tree;
2257 int n, m; /* iterate over the tree elements */
2266 * overflow in the case of the bit length tree).
2268 tree[s->heap[s->heap_max]].Len = 0; /* root of the heap */
2272 bits = tree[tree[n].Dad].Len + 1;
2274 tree[n].Len = (ush)bits;
2275 /* We overwrite tree[n].Dad which is no longer needed */
2282 f = tree[n].Freq;
2295 s->bl_count[bits]--; /* move one leaf down the tree */
2314 if (tree[m].Len != (unsigned) bits) {
2315 Trace((stderr,"code %d bits %d->%d\n", m, tree[m].Len, bits));
2316 s->opt_len += ((long)bits - (long)tree[m].Len)
2317 *(long)tree[m].Freq;
2318 tree[m].Len = (ush)bits;
2326 * Generate the codes for a given tree and bit counts (which need not be
2329 * the given tree and the field len is set for all tree elements.
2330 * OUT assertion: the field code is set for all tree elements of non
2333 local void gen_codes (tree, max_code, bl_count)
2334 ct_data *tree; /* the tree to decorate */
2357 int len = tree[n].Len;
2360 tree[n].Code = bi_reverse(next_code[len]++, len);
2362 Tracecv(tree != static_ltree, (stderr,"\nn %3d %c l %2d c %4x (%x) ",
2363 n, (isgraph(n) ? n : ' '), len, tree[n].Code, next_code[len]-1));
2368 * Construct one Huffman tree and assigns the code bit strings and lengths.
2370 * IN assertion: the field freq is set for all tree elements.
2377 tree_desc *desc; /* the tree descriptor */
2379 ct_data *tree = desc->dyn_tree;
2393 if (tree[n].Freq != 0) {
2397 tree[n].Len = 0;
2408 tree[node].Freq = 1;
2415 /* The elements heap[heap_len/2+1 .. heap_len] are leaves of the tree,
2418 for (n = s->heap_len/2; n >= 1; n--) pqdownheap(s, tree, n);
2420 /* Construct the Huffman tree by repeatedly combining the least two
2423 node = elems; /* next internal node of the tree */
2425 pqremove(s, tree, n); /* n = node of least frequency */
2432 tree[node].Freq = tree[n].Freq + tree[m].Freq;
2434 tree[n].Dad = tree[m].Dad = (ush)node;
2436 if (tree == s->bl_tree) {
2438 node, tree[node].Freq, n, tree[n].Freq, m, tree[m].Freq);
2443 pqdownheap(s, tree, SMALLEST);
2455 gen_codes ((ct_data *)tree, max_code, s->bl_count);
2459 * Scan a literal or distance tree to determine the frequencies of the codes
2460 * in the bit length tree.
2462 local void scan_tree (s, tree, max_code)
2464 ct_data *tree; /* the tree to be scanned */
2467 int n; /* iterates over all tree elements */
2470 int nextlen = tree[0].Len; /* length of next code */
2476 tree[max_code+1].Len = (ush)0xffff; /* guard */
2479 curlen = nextlen; nextlen = tree[n+1].Len;
2504 * Send a literal or distance tree in compressed form, using the codes in
2507 local void send_tree (s, tree, max_code)
2509 ct_data *tree; /* the tree to be scanned */
2512 int n; /* iterates over all tree elements */
2515 int nextlen = tree[0].Len; /* length of next code */
2520 /* tree[max_code+1].Len = -1; */ /* guard already set */
2524 curlen = nextlen; nextlen = tree[n+1].Len;
2555 * Construct the Huffman tree for the bit lengths and return the index in
2567 /* Build the bit length tree: */
2569 /* opt_len now includes the length of the tree representations, except
2580 /* Update opt_len to include the bit length tree and counts */
2590 * lengths of the bit length codes, the literal tree and the distance tree.
2595 int lcodes, dcodes, blcodes; /* number of codes for each tree */
2610 Tracev((stderr, "\nbl tree: sent %ld", s->bits_sent));
2612 send_tree(s, (ct_data *)s->dyn_ltree, lcodes-1); /* literal tree */
2613 Tracev((stderr, "\nlit tree: sent %ld", s->bits_sent));
2615 send_tree(s, (ct_data *)s->dyn_dtree, dcodes-1); /* distance tree */
2616 Tracev((stderr, "\ndist tree: sent %ld", s->bits_sent));
2707 * the compressed block data, excluding the tree representations.
2710 /* Build the bit length tree for the above two trees, and get the index
2845 ct_data *ltree; /* literal tree */
2846 ct_data *dtree; /* distance tree */
3462 uIntf *, /* bits tree desired/actual depth */
3463 inflate_huft * FAR *, /* bits tree result */
3472 inflate_huft * FAR *, /* literal/length tree result */
3473 inflate_huft * FAR *, /* distance tree result */
3479 inflate_huft * FAR *, /* literal/length tree result */
3480 inflate_huft * FAR *)); /* distance tree result */
3537 BTREE, /* get bit lengths tree for a dynamic block */
3558 uInt bb; /* bit length tree depth */
3559 inflate_huft *tb; /* bit length decoding tree */
3648 end-of-block. Note however that the static length tree defines
3662 10. In the tree reconstruction algorithm, Code = Code + Increment
3872 Tracev((stderr, "inflate: bits tree ok\n"));
4397 uIntf *bb; /* bits tree desired/actual depth */
4398 inflate_huft * FAR *tb; /* bits tree result */
4405 z->msg = (char*)"oversubscribed dynamic bit lengths tree";
4409 z->msg = (char*)"incomplete dynamic bit lengths tree";
4422 inflate_huft * FAR *tl; /* literal/length tree result */
4423 inflate_huft * FAR *td; /* distance tree result */
4428 /* build literal/length tree */
4433 z->msg = (char*)"oversubscribed literal/length tree";
4437 z->msg = (char*)"incomplete literal/length tree";
4443 /* build distance tree */
4448 z->msg = (char*)"oversubscribed distance tree";
4455 z->msg = (char*)"incomplete distance tree";
4460 z->msg = (char*)"empty distance tree with lengths";
4498 inflate_huft * FAR *tl; /* literal/length tree result */
4499 inflate_huft * FAR *td; /* distance tree result */
4633 inflate_huft *tree; /* pointer into tree */
4635 } code; /* if LEN or DIST, where in tree */
4646 inflate_huft *ltree; /* literal/length/eob tree */
4647 inflate_huft *dtree; /* distance tree */
4712 c->sub.code.tree = c->ltree;
4717 t = c->sub.code.tree + ((uInt)b & inflate_mask[j]);
4739 c->sub.code.tree = t->next;
4758 c->sub.code.tree = c->dtree;
4764 t = c->sub.code.tree + ((uInt)b & inflate_mask[j]);
4777 c->sub.code.tree = t->next;
4986 uInt ml; /* mask for literal/length tree */
4987 uInt md; /* mask for distance tree */