public static void UpdateZopfliNode(global::encode.backward_references.ZopfliNode[] nodes, int nodes_off, int pos, int start_pos, int len, int len_code, int dist, int dist_code, int max_dist, int[] dist_cache, double cost)
{
global::encode.backward_references.ZopfliNode next = ((global::encode.backward_references.ZopfliNode)(((global::encode.backward_references.ZopfliNode[])(nodes))[((nodes_off + pos) + len)]));
next.length = len;
next.length_code = len_code;
next.distance = dist;
next.distance_code = dist_code;
next.insert_length = (pos - start_pos);
next.cost = cost;
global::encode.Backward_references.SetDistanceCache(dist, dist_code, max_dist, dist_cache, next.distance_cache, 0);
}
public static void __hx_ctor_encode_backward_references_ZopfliNode(global::encode.backward_references.ZopfliNode __hx_this)
{
unchecked {
__hx_this.distance_cache = global::FunctionMalloc.mallocInt(4);
__hx_this.length = 1;
__hx_this.distance = 0;
__hx_this.distance_code = 0;
__hx_this.length_code = 0;
__hx_this.insert_length = 0;
__hx_this.cost = global::encode.Backward_references.kInfinity;
}
}
public static void ZopfliIterate(int num_bytes, int position, uint[] ringbuffer, int ringbuffer_mask, int max_backward_limit, global::encode.backward_references.ZopfliCostModel model, int[] num_matches, global::Array <object> matches, int[] dist_cache, global::Array <int> last_insert_len, global::Array <object> commands, int commands_off, global::Array <int> num_commands, global::Array <int> num_literals)
{
unchecked {
int orig_commands_off = commands_off;
global::encode.backward_references.ZopfliNode[] nodes = global::FunctionMalloc.malloc_encode_backward_references_ZopfliNode(typeof(global::encode.backward_references.ZopfliNode), (num_bytes + 1));
((global::encode.backward_references.ZopfliNode)(((global::encode.backward_references.ZopfliNode[])(nodes))[0])).length = 0;
((global::encode.backward_references.ZopfliNode)(((global::encode.backward_references.ZopfliNode[])(nodes))[0])).cost = ((double)(0));
global::DefaultFunctions.memcpy_Int(((global::encode.backward_references.ZopfliNode)(((global::encode.backward_references.ZopfliNode[])(nodes))[0])).distance_cache, 0, dist_cache, 0, 4);
global::encode.backward_references.StartPosQueue queue = new global::encode.backward_references.StartPosQueue(((int)(3)));
double min_cost_cmd = model.GetMinCostCmd();
int cur_match_pos = 0;
int i = 0;
while (((i + 3) < num_bytes))
{
int cur_ix = (position + i);
int cur_ix_masked = (cur_ix & ringbuffer_mask);
int max_distance = ((int)(global::System.Math.Min(((double)(cur_ix)), ((double)(max_backward_limit)))));
int max_length = (num_bytes - i);
queue.Push(i, (((global::encode.backward_references.ZopfliNode)(((global::encode.backward_references.ZopfliNode[])(nodes))[i])).cost - model.GetLiteralCosts(0, i)));
int min_len = global::encode.Backward_references.ComputeMinimumCopyLength(queue, nodes, model, i, min_cost_cmd);
int k = 0;
while (((k < 5) && (k < queue.size())))
{
int start = queue.GetStartPos(k);
double start_costdiff = (((global::encode.backward_references.ZopfliNode)(((global::encode.backward_references.ZopfliNode[])(nodes))[start])).cost - model.GetLiteralCosts(0, start));
int[] dist_cache2 = ((global::encode.backward_references.ZopfliNode)(((global::encode.backward_references.ZopfliNode[])(nodes))[start])).distance_cache;
int best_len = (min_len - 1);
{
int _g = 0;
while ((_g < 16))
{
int j = _g++;
int backward = (((int)(((int[])(dist_cache2))[global::encode.Hash.kDistanceCacheIndex[j]])) + global::encode.Hash.kDistanceCacheOffset[j]);
int prev_ix = (cur_ix - backward);
if ((prev_ix >= cur_ix))
{
continue;
}
if ((backward > max_distance))
{
continue;
}
prev_ix &= ringbuffer_mask;
if (((((cur_ix_masked + best_len) > ringbuffer_mask) || ((prev_ix + best_len) > ringbuffer_mask)) || ((bool)((((uint)(((uint[])(ringbuffer))[(cur_ix_masked + best_len)])) != ((uint)(((uint[])(ringbuffer))[(prev_ix + best_len)])))))))
{
continue;
}
{
int _g2 = (best_len + 1);
int _g1 = (global::encode.Find_match_length.FindMatchLengthWithLimit(ringbuffer, prev_ix, ringbuffer, cur_ix_masked, max_length) + 1);
while ((_g2 < _g1))
{
int l = _g2++;
double cost = ((start_costdiff + model.GetCommandCost(j, l, (i - start))) + model.GetLiteralCosts(0, i));
if ((cost < ((global::encode.backward_references.ZopfliNode)(((global::encode.backward_references.ZopfliNode[])(nodes))[(i + l)])).cost))
{
global::encode.Backward_references.UpdateZopfliNode(nodes, 0, i, start, l, l, backward, j, max_distance, dist_cache2, cost);
}
best_len = l;
}
}
}
}
if ((k >= 2))
{
++k;
continue;
}
int len = min_len;
{
int _g11 = 0;
int _g3 = ((int)(((int[])(num_matches))[i]));
while ((_g11 < _g3))
{
global::encode.hash.BackwardMatch match = ((global::encode.hash.BackwardMatch)(matches[(cur_match_pos + _g11++)]));
int dist = match.distance;
bool is_dictionary_match = (dist > max_distance);
int dist_code = (dist + 15);
int max_len = match.length();
if (((len < max_len) && ((is_dictionary_match || (max_len > 325)))))
{
len = max_len;
}
while ((len <= max_len))
{
int len_code = ((is_dictionary_match) ? (match.length_code()) : (len));
double cost1 = ((start_costdiff + model.GetCommandCost(dist_code, len_code, (i - start))) + model.GetLiteralCosts(0, i));
if ((cost1 < ((global::encode.backward_references.ZopfliNode)(((global::encode.backward_references.ZopfliNode[])(nodes))[(i + len)])).cost))
{
global::encode.Backward_references.UpdateZopfliNode(nodes, 0, i, start, len, len_code, dist, dist_code, max_distance, dist_cache2, cost1);
}
++len;
}
}
}
++k;
}
cur_match_pos += ((int)(((int[])(num_matches))[i]));
if (((((int)(((int[])(num_matches))[i])) == 1) && (((global::encode.hash.BackwardMatch)(matches[(cur_match_pos - 1)])).length() > 325)))
{
i += (((global::encode.hash.BackwardMatch)(matches[(cur_match_pos - 1)])).length() - 1);
queue.Clear();
}
++i;
}
global::Array <int> backwards = new global::Array <int>();
int index = num_bytes;
while ((((global::encode.backward_references.ZopfliNode)(((global::encode.backward_references.ZopfliNode[])(nodes))[index])).cost == global::encode.Backward_references.kInfinity))
{
--index;
}
while ((index > 0))
{
int len1 = (((global::encode.backward_references.ZopfliNode)(((global::encode.backward_references.ZopfliNode[])(nodes))[index])).length + ((global::encode.backward_references.ZopfliNode)(((global::encode.backward_references.ZopfliNode[])(nodes))[index])).insert_length);
backwards.push(len1);
index -= len1;
}
global::Array <int> path = new global::Array <int>();
int i1 = backwards.length;
while ((i1 > 0))
{
path.push(backwards[(i1 - 1)]);
--i1;
}
int pos = 0;
{
int _g12 = 0;
int _g4 = path.length;
while ((_g12 < _g4))
{
int i2 = _g12++;
global::encode.backward_references.ZopfliNode next = ((global::encode.backward_references.ZopfliNode)(((global::encode.backward_references.ZopfliNode[])(nodes))[(pos + path[i2])]));
int copy_length = next.length;
int insert_length = next.insert_length;
pos += insert_length;
if ((i2 == 0))
{
insert_length += last_insert_len[0];
}
int distance = next.distance;
int len_code1 = next.length_code;
bool is_dictionary = (distance > ((int)(global::System.Math.Min(((double)((position + pos))), ((double)(max_backward_limit))))));
int dist_code1 = next.distance_code;
global::encode.command.Command command = new global::encode.command.Command();
command.Command4(insert_length, copy_length, len_code1, dist_code1);
commands[commands_off++] = command;
if ((!(is_dictionary) && (dist_code1 > 0)))
{
((int[])(dist_cache))[3] = ((int)(((int[])(dist_cache))[2]));
((int[])(dist_cache))[2] = ((int)(((int[])(dist_cache))[1]));
((int[])(dist_cache))[1] = ((int)(((int[])(dist_cache))[0]));
((int[])(dist_cache))[0] = distance;
}
num_literals[0] += insert_length;
insert_length = 0;
pos += copy_length;
}
}
last_insert_len[0] = (num_bytes - pos);
num_commands[0] += (commands_off - orig_commands_off);
}
}
