diff --git a/src/reassembler.cc b/src/reassembler.cc
index ededa6f..f47f162 100644
--- a/src/reassembler.cc
+++ b/src/reassembler.cc
@@ -5,11 +5,55 @@ using namespace std;
 
 void Reassembler::insert(uint64_t first_index, string data,
                          bool is_last_substring, Writer &output) {
-    if (first_index > nxt_idx + output.available_capacity())
-        return;
-    if (is_last_substring) {
-        if (i)
+     uint64_t cap = output.available_capacity();
+     uint64_t max_idx = nxt_idx+cap;
+     uint64_t dst_idx = first_index+data.size();
+     if(first_index>max_idx) return;
+     if(is_last_substring) end_idx=dst_idx>max_idx?max_idx:dst_idx;
+     if(first_index==nxt_idx){
+         if(cap<data.size()) {
+             output.push(data.substr(0,cap));
+             output.close();//已经填充完了
+         }
+         else {
+             output.push(data);
+             nxt_idx+=data.size();
+             backteam(output);
+         }
+     }
+     else if(first_index>nxt_idx){
+         if(first_index+data.size()>max_idx){
+             store(first_index,data.substr(0,max_idx-first_index));
+             end_idx=max_idx;
+         }
+         else store(first_index,data);
+     }
+     else{
+         if(first_index+data.size()>=max_idx){
+             output.push(data.substr(nxt_idx-first_index,cap));
+             output.close();
+         }
+         else{
+             output.push(data.substr(nxt_idx-first_index,data.size()-nxt_idx+first_index));
+             nxt_idx+=data.size()-nxt_idx+first_index;
+             backteam(output);
+         }
+     }
+}
+
+void Reassembler::store(uint64_t idx,std::string str){
+    //需要处理以下，避免内部重叠
+    for(auto it=data_map.begin();it!=data_map.end();it++){
+        //此处处理掉内部的重叠问题
     }
+    data_map[idx]=str;
 }
 
+void Reassembler::backteam(Writer& out) {
+    for(auto it=data_map.begin();it!=data_map.end();it++){
+        if(it->first==nxt_idx){
+
+        }
+    }
+}
 uint64_t Reassembler::bytes_pending() const { return {}; }
diff --git a/src/reassembler.hh b/src/reassembler.hh
index 4d8466b..237fa53 100644
--- a/src/reassembler.hh
+++ b/src/reassembler.hh
@@ -40,4 +40,6 @@ class Reassembler {
     uint64_t nxt_idx;
     uint64_t end_idx;
     std::map<uint64_t, std::string> data_map;
+    void store(uint64_t,std::string);
+    void backteam(Writer&);
 };