function zip_scan_tree()

in themes/docsy/static/js/deflate.js [1213:1256]

• 42 lines of code
• 11 McCabe index (conditional complexity)

    function zip_scan_tree(tree,// the tree to be scanned
        max_code) {  // and its largest code of non zero frequency
        var n;			// iterates over all tree elements
        var prevlen = -1;		// last emitted length
        var curlen;			// length of current code
        var nextlen = tree[0].dl;	// length of next code
        var count = 0;		// repeat count of the current code
        var max_count = 7;		// max repeat count
        var min_count = 4;		// min repeat count

        if (nextlen == 0) {
            max_count = 138;
            min_count = 3;
        }
        tree[max_code + 1].dl = 0xffff; // guard

        for (n = 0; n <= max_code; n++) {
            curlen = nextlen;
            nextlen = tree[n + 1].dl;
            if (++count < max_count && curlen == nextlen)
                continue;
            else if (count < min_count)
                zip_bl_tree[curlen].fc += count;
            else if (curlen != 0) {
                if (curlen != prevlen)
                    zip_bl_tree[curlen].fc++;
                zip_bl_tree[zip_REP_3_6].fc++;
            } else if (count <= 10)
                zip_bl_tree[zip_REPZ_3_10].fc++;
            else
                zip_bl_tree[zip_REPZ_11_138].fc++;
            count = 0; prevlen = curlen;
            if (nextlen == 0) {
                max_count = 138;
                min_count = 3;
            } else if (curlen == nextlen) {
                max_count = 6;
                min_count = 3;
            } else {
                max_count = 7;
                min_count = 4;
            }
        }
    }