From 844eac0d3d31b82c54fe16685bc0b25be903b88d Mon Sep 17 00:00:00 2001
From: wangyu- <wangyucn@gmail.com>
Date: Thu, 5 Oct 2017 12:21:06 -0500
Subject: [PATCH] mainly function done

---
 common.cpp      |  46 ++++++++++
 common.h        |  14 +++
 fec_manager.cpp | 201 ++++++++++++++++++++++++++++++++++++++++++
 fec_manager.h   | 229 ++++++++++++++++++++++++++++++++++++++++++++----
 main.cpp        |  44 +++++++++-
 makefile        |   2 +-
 packet.cpp      |  95 +-------------------
 packet.h        |   4 +-
 8 files changed, 522 insertions(+), 113 deletions(-)

diff --git a/common.cpp b/common.cpp
index f999390..f23c4c1 100644
--- a/common.cpp
+++ b/common.cpp
@@ -52,6 +52,47 @@ u32_t get_u64_l(u64_t a)
 	return (a<<32u)>>32u;
 }
 
+void write_u16(char * p,u16_t w)
+{
+	*(unsigned char*)(p + 1) = (w & 0xff);
+	*(unsigned char*)(p + 0) = (w >> 8);
+}
+u16_t read_u16(char * p)
+{
+	u16_t res;
+	res = *(const unsigned char*)(p + 0);
+	res = *(const unsigned char*)(p + 1) + (res << 8);
+	return res;
+}
+
+void write_u32(char * p,u32_t l)
+{
+	*(unsigned char*)(p + 3) = (unsigned char)((l >>  0) & 0xff);
+	*(unsigned char*)(p + 2) = (unsigned char)((l >>  8) & 0xff);
+	*(unsigned char*)(p + 1) = (unsigned char)((l >> 16) & 0xff);
+	*(unsigned char*)(p + 0) = (unsigned char)((l >> 24) & 0xff);
+}
+u32_t read_u32(char * p)
+{
+	u32_t res;
+	res = *(const unsigned char*)(p + 0);
+	res = *(const unsigned char*)(p + 1) + (res << 8);
+	res = *(const unsigned char*)(p + 2) + (res << 8);
+	res = *(const unsigned char*)(p + 3) + (res << 8);
+	return res;
+}
+
+void write_u64(char * s,u64_t a)
+{
+	assert(0==1);
+}
+u64_t read_u64(char * s)
+{
+	assert(0==1);
+	return 0;
+}
+
+
 char * my_ntoa(u32_t ip)
 {
 	in_addr a;
@@ -431,3 +472,8 @@ char * ip_port_t::to_s()
 	sprintf(res,"%s:%d",my_ntoa(ip),port);
 	return res;
 }
+
+int round_up_div(int a,int b)
+{
+	return (a+b-1)/b;
+}
diff --git a/common.h b/common.h
index 1fce585..5661d39 100644
--- a/common.h
+++ b/common.h
@@ -58,6 +58,9 @@ typedef long long i64_t;
 typedef unsigned int u32_t;
 typedef int i32_t;
 
+typedef unsigned short u16_t;
+typedef short i16_t;
+
 typedef u64_t my_time_t;
 
 const int max_data_len=1600;
@@ -165,6 +168,15 @@ u32_t get_u64_h(u64_t a);
 
 u32_t get_u64_l(u64_t a);
 
+void write_u16(char *,u16_t a);
+u16_t read_u16(char *);
+
+void write_u32(char *,u32_t a);
+u32_t read_u32(char *);
+
+void write_u64(char *,u64_t a);
+u64_t read_uu64(char *);
+
 char * my_ntoa(u32_t ip);
 
 void myexit(int a);
@@ -195,6 +207,8 @@ int random_between(u32_t a,u32_t b);
 
 int set_timer_ms(int epollfd,int &timer_fd,u32_t timer_interval);
 
+int round_up_div(int a,int b);
+
 /*
 int create_new_udp(int &new_udp_fd,int remote_address_uint32,int remote_port);
 */
diff --git a/fec_manager.cpp b/fec_manager.cpp
index a8947a6..2506573 100644
--- a/fec_manager.cpp
+++ b/fec_manager.cpp
@@ -5,6 +5,207 @@
  *      Author: root
  */
 
+#include "fec_manager.h"
+#include "log.h"
+#include "common.h"
+#include "lib/rs.h"
+u32_t seq=0;
 
 
 
+blob_encode_t::blob_encode_t()
+{
+	clear();
+}
+int blob_encode_t::clear()
+{
+	counter=0;
+	current_len=(int)sizeof(u32_t);
+	return 0;
+}
+
+int blob_encode_t::get_num()
+{
+	return counter;
+}
+int blob_encode_t::get_shard_len(int n)
+{
+	return round_up_div(current_len,n);
+}
+
+int blob_encode_t::get_shard_len(int n,int next_packet_len)
+{
+	return round_up_div(current_len+(int)sizeof(u16_t)+next_packet_len,n);
+}
+
+int blob_encode_t::input(char *s,int len)
+{
+	assert(current_len+len+sizeof(u16_t) <=256*buf_len);
+	assert(len<=65535&&len>=0);
+	counter++;
+	assert(counter<=max_packet_num);
+	write_u16(buf+current_len,len);
+	current_len+=sizeof(u16_t);
+	memcpy(buf+current_len,s,len);
+	current_len+=len;
+	return 0;
+}
+
+int blob_encode_t::output(int n,char ** &s_arr,int & len)
+{
+	static char *output_arr[256+100];
+	len=round_up_div(current_len,n);
+	write_u32(buf,counter);
+	for(int i=0;i<n;i++)
+	{
+		output_arr[i]=buf+len*i;
+	}
+	s_arr=output_arr;
+	return 0;
+}
+blob_decode_t::blob_decode_t()
+{
+	clear();
+
+}
+int blob_decode_t::clear()
+{
+	current_len=0;
+	last_len=-1;
+	counter=0;
+	return 0;
+}
+int blob_decode_t::input(char *s,int len)
+{
+	if(last_len!=-1)
+	{
+		assert(last_len==len);
+	}
+	counter++;
+	assert(counter<=256);
+	last_len=len;
+	assert(current_len+len+100<(int)sizeof(buf));
+	memcpy(buf+current_len,s,len);
+	current_len+=len;
+	return 0;
+}
+int blob_decode_t::output(int &n,char ** &s_arr,int *&len_arr)
+{
+	static char *s_buf[max_packet_num+100];
+	static int len_buf[max_packet_num+100];
+
+	int parser_pos=0;
+
+	if(parser_pos+(int)sizeof(u32_t)>current_len) return -1;
+
+	n=(int)read_u32(buf+parser_pos);
+	if(n>max_packet_num) {mylog(log_info,"failed 1\n");return -1;}
+	s_arr=s_buf;
+	len_arr=len_buf;
+
+	parser_pos+=sizeof(u32_t);
+	for(int i=0;i<n;i++)
+	{
+		if(parser_pos+(int)sizeof(u16_t)>current_len) {mylog(log_info,"failed2 \n");return -1;}
+		len_arr[i]=(int)read_u16(buf+parser_pos);
+		parser_pos+=(int)sizeof(u16_t);
+		if(parser_pos+len_arr[i]>current_len) {mylog(log_info,"failed 3 %d  %d %d\n",parser_pos,len_arr[i],current_len);return -1;}
+		s_arr[i]=buf+parser_pos;
+		parser_pos+=len_arr[i];
+	}
+	return 0;
+}
+
+fec_encode_manager_t::fec_encode_manager_t()
+{
+	re_init();
+}
+int fec_encode_manager_t::re_init()
+{
+	fec_data_num=4;
+	fec_redundant_num=2;
+	fec_mtu=1200;
+
+	counter=0;
+	blob_encode.clear();
+	ready_for_output=0;
+	return 0;
+}
+int fec_encode_manager_t::input(char *s,int len,int &is_first_packet)
+{
+	is_first_packet=0;
+    if(s==0 ||blob_encode.get_shard_len(fec_data_num,len)>=fec_mtu)
+	{
+    	char ** blob_output;
+    	int blob_len;
+    	assert(counter!=0);
+    	blob_encode.output(fec_data_num,blob_output,blob_len);
+    	for(int i=0;i<fec_data_num+fec_redundant_num;i++)
+    	{
+    		int tmp_idx=0;
+    		write_u32(buf[i]+tmp_idx,seq);
+    		tmp_idx+=sizeof(u32_t);
+    		buf[i][tmp_idx++]=(unsigned char)fec_data_num;
+    		buf[i][tmp_idx++]=(unsigned char)fec_redundant_num;
+    		buf[i][tmp_idx++]=(unsigned char)i;
+    		buf[i][tmp_idx++]=(unsigned char)0;
+    		if(i<fec_data_num)
+    		{
+    			memcpy(buf[i]+tmp_idx,blob_output[i],blob_len);
+    			tmp_idx+=blob_len;
+    		}
+    		output_buf[i]=buf[i]+sizeof(u32_t)+3*sizeof(char);
+
+    	}
+    	output_len=blob_len+sizeof(u32_t)+3*sizeof(char);
+		rs_encode2(fec_data_num,fec_data_num+fec_redundant_num,output_buf,blob_len);
+		for(int i=0;i<fec_data_num+fec_redundant_num;i++)
+		{
+			output_buf[i]=buf[i];
+		}
+
+    	ready_for_output=1;
+    	seq++;
+    	counter=0;
+    	blob_encode.clear();
+	}
+
+    if(s!=0)
+    {
+    	if(counter==0) is_first_packet=1;
+    	blob_encode.input(s,len);
+    	counter++;
+    }
+
+	return 0;
+}
+
+int fec_encode_manager_t::output(int &n,char ** &s_arr,int &len)
+{
+	if(!ready_for_output)
+	{
+		n=-1;
+		len=-1;
+		s_arr=0;
+	}
+	else
+	{
+		n=fec_data_num+fec_redundant_num;
+		len=output_len;
+		s_arr=output_buf;
+		ready_for_output=0;
+	}
+	return 0;
+}
+
+/*
+int fec_decode_manager_t::input(char *s,int l)
+{
+	return 0;
+}
+
+int fec_decode_manager_t::output(int &n,char ** &s_arr,int* &l_arr)
+{
+	return 0;
+}*/
+
diff --git a/fec_manager.h b/fec_manager.h
index ecf9e6f..c43c746 100644
--- a/fec_manager.h
+++ b/fec_manager.h
@@ -8,34 +8,229 @@
 #ifndef FEC_MANAGER_H_
 #define FEC_MANAGER_H_
 
+#include "common.h"
+#include "log.h"
+#include "lib/rs.h"
+
+const int max_packet_num=1000;
+
+const u32_t anti_replay_buff_size=30000;
+const u32_t fec_buff_size=3000;
 
 
-struct fec_encode_manager_t
+struct anti_replay_t
 {
-	int input(char *,int l);
-	int ready_for_output();
-	int output(char ** &,int l,int &n);
-};
 
-struct fec_decode_manager_t
-{
-	int input(char *,int l);
-	int ready_for_output();
-	int output(char ** &,int l,int &n);
-};
+	u64_t replay_buffer[anti_replay_buff_size];
+	unordered_set<u32_t> st;
+	int index;
+	anti_replay_t()
+	{
+		memset(replay_buffer,-1,sizeof(replay_buffer));
+		st.rehash(anti_replay_buff_size*10);
+		index=0;
+	}
+	void set_invaild(u32_t seq)
+	{
 
+		if(st.find(seq)!=st.end() )
+		{
+			mylog(log_trace,"seq %llx exist\n",seq);
+			return;
+			//return 0;
+		}
+		if(replay_buffer[index]!=u64_t(i64_t(-1)))
+		{
+			assert(st.find(replay_buffer[index])!=st.end());
+			st.erase(replay_buffer[index]);
+		}
+		replay_buffer[index]=seq;
+		st.insert(seq);
+		index++;
+		if(index==int(anti_replay_buff_size)) index=0;
+		//return 1; //for complier check
+	}
+	int is_vaild(u32_t seq)
+	{
+		return st.find(seq)==st.end();
+	}
+};
 
 struct blob_encode_t
 {
-	int input(char *,int l);
-	int ready_for_output();
-	int output(char ** &,int l,int &n);
+	char buf[(256+5)*buf_len];
+	int current_len;
+	int counter;
+
+	blob_encode_t();
+
+    int clear();
+
+    int get_num();
+    int get_shard_len(int n);
+    int get_shard_len(int n,int next_packet_len);
+
+	int input(char *s,int len);  //len=use len=0 for second and following packet
+	int output(int n,char ** &s_arr,int & len);
 };
 
 struct blob_decode_t
 {
-	int input(char *,int l);
-	int ready_for_output();
-	int output(char ** &,int l,int &n);
+	char buf[(256+5)*buf_len];
+	int current_len;
+	int last_len;
+	int counter;
+
+	blob_decode_t();
+	int clear();
+	int input(char *input,int len);
+	int output(int &n,char ** &output,int *&len_arr);
 };
+
+struct fec_encode_manager_t
+{
+	int fec_data_num,fec_redundant_num;
+	int fec_mtu;
+	char buf[256+5][buf_len+100];
+	char *output_buf[256+5];
+	int output_len;
+	int ready_for_output;
+
+	int counter;
+
+	blob_encode_t blob_encode;
+	fec_encode_manager_t();
+	int re_init();
+	int input(char *s,int len,int &is_first_packet);
+	int output(int &n,char ** &s_arr,int &len);
+};
+struct fec_data_t
+{
+	int used;
+	u32_t seq;
+	int data_num;
+	int redundant_num;
+	int idx;
+	int type;
+	char buf[buf_len];
+	int len;
+};
+struct fec_decode_manager_t
+{
+	anti_replay_t anti_replay;
+	fec_data_t fec_data[fec_buff_size];
+	int index;
+	unordered_map<u32_t, map<int,int> > mp;
+	blob_decode_t blob_decode;
+
+	fec_decode_manager_t()
+	{
+		for(int i=0;i<(int)fec_buff_size;i++)
+			fec_data[i].used=0;
+		ready_for_output=0;
+	}
+
+	int output_n;
+	char ** output_s_arr;
+	int * output_len_arr;
+
+	int ready_for_output;
+	int input(char *s,int len)
+	{
+		char *ori_s=s;
+		u32_t seq=read_u32(s);
+		s+=sizeof(u32_t);
+		int data_num=(unsigned char)*(s++);
+		int redundant_num=(unsigned char)*(s++);
+		int innder_index=(unsigned char)*(s++);
+		int type=(unsigned char)*(s++);
+		len=len-int(s-ori_s);
+		if(len<0)
+		{
+			return -1;
+		}
+
+		if(!anti_replay.is_vaild(seq))
+		{
+			return 0;
+		}
+		if(!mp[seq].empty())
+		{
+			int tmp_idx=mp[seq].begin()->second;
+			int ok=1;
+			if(data_num+redundant_num>255)
+				ok=0;
+			if(fec_data[tmp_idx].data_num!=data_num||fec_data[tmp_idx].redundant_num!=redundant_num||fec_data[tmp_idx].len!=len)
+			{
+				ok=0;
+			}
+			if(ok==0)
+			{
+				return 0;
+			}
+		}
+		if(fec_data[index].used!=0)
+		{
+			int tmp_seq=fec_data[index].seq;
+			anti_replay.set_invaild(tmp_seq);
+			if(mp.find(tmp_seq)!=mp.end())
+			{
+				mp.erase(tmp_seq);
+			}
+		}
+
+		fec_data[index].used=1;
+		fec_data[index].seq=seq;
+		fec_data[index].data_num=data_num;
+		fec_data[index].redundant_num=redundant_num;
+		fec_data[index].idx=innder_index;
+		fec_data[index].type=type;
+		fec_data[index].len=len;
+		mp[seq][innder_index]=index;
+
+
+		map<int,int> &inner_mp=mp[seq];
+		if((int)inner_mp.size()>=data_num)
+		{
+			anti_replay.set_invaild(seq);
+			char *fec_tmp_arr[256+5]={0};
+			for(auto it=inner_mp.begin();it!=inner_mp.end();it++)
+			{
+				fec_tmp_arr[it->first]=fec_data[it->second].buf;
+			}
+			rs_decode2(data_num,redundant_num,fec_tmp_arr,len);
+			blob_decode.clear();
+			for(int i=0;i<data_num;i++)
+			{
+				blob_decode.input(fec_tmp_arr[i],len);
+			}
+			blob_decode.output(output_n,output_s_arr,output_len_arr);
+			ready_for_output=1;
+		}
+
+		index++;
+		if(index==int(anti_replay_buff_size)) index=0;
+
+
+		return 0;
+	}
+	int output(int &n,char ** &s_arr,int* &len_arr)
+	{
+		if(!ready_for_output)
+		{
+			n=-1;
+			s_arr=0;
+			len_arr=0;
+		}
+		else
+		{
+			ready_for_output=0;
+			n=output_n;
+			s_arr=output_s_arr;
+			len_arr=output_len_arr;
+		}
+		return 0;
+	}
+};
+
 #endif /* FEC_MANAGER_H_ */
diff --git a/main.cpp b/main.cpp
index 32db4dd..6741dd9 100644
--- a/main.cpp
+++ b/main.cpp
@@ -6,6 +6,7 @@
 #include "connection.h"
 #include "fd_manager.h"
 #include "delay_manager.h"
+#include "fec_manager.h"
 
 using  namespace std;
 
@@ -539,7 +540,6 @@ int server_event_loop()
 				mylog(log_fatal,"unknown fd,this should never happen\n");
 				myexit(-1);
 			}
-
 		}
 		delay_manager.check();
 	}
@@ -581,6 +581,48 @@ int unit_test()
 		printf("<%s>",data[i]);
 	}
 	fec_free(code);
+
+
+	char arr2[6][100]=
+	{
+		"aaa11111","","ccc333333333"
+		,"ddd444","eee5555","ff6666"
+	};
+	blob_encode_t blob_encode;
+	for(int i=0;i<6;i++)
+		blob_encode.input(arr2[i],strlen(arr2[i]));
+
+	char **output;
+	int shard_len;
+	blob_encode.output(7,output,shard_len);
+
+
+	printf("<shard_len:%d>",shard_len);
+	blob_decode_t blob_decode;
+	for(int i=0;i<7;i++)
+	{
+		blob_decode.input(output[i],shard_len);
+	}
+
+	char **decode_output;
+	int * len_arr;
+	int num;
+
+
+	ret=blob_decode.output(num,decode_output,len_arr);
+
+	printf("<num:%d,ret:%d>\n",num,ret);
+	for(int i=0;i<num;i++)
+	{
+		char buf[1000]={0};
+		memcpy(buf,decode_output[i],len_arr[i]);
+		printf("<%d:%s>",len_arr[i],buf);
+	}
+	printf("\n");
+
+	fec_encode_manager_t fec_encode_manager;
+	fec_decode_manager_t fec_decode_manager;
+
 	return 0;
 }
 void print_help()
diff --git a/makefile b/makefile
index b7b846b..bd35cf2 100755
--- a/makefile
+++ b/makefile
@@ -8,7 +8,7 @@ cc_arm= /toolchains/arm-2014.05/bin/arm-none-linux-gnueabi-g++
 #cc_bcm2708=/home/wangyu/raspberry/tools/arm-bcm2708/gcc-linaro-arm-linux-gnueabihf-raspbian/bin/arm-linux-gnueabihf-g++ 
 FLAGS= -std=c++11   -Wall -Wextra -Wno-unused-variable -Wno-unused-parameter -Wno-missing-field-initializers
 
-SOURCES=main.cpp log.cpp common.cpp lib/fec.c lib/rs.c packet.cpp delay_manager.cpp fd_manager.cpp connection.cpp
+SOURCES=main.cpp log.cpp common.cpp lib/fec.c lib/rs.c packet.cpp delay_manager.cpp fd_manager.cpp connection.cpp fec_manager.cpp
 
 NAME=speeder
 TARGETS=amd64 arm mips24kc_be x86  mips24kc_le
diff --git a/packet.cpp b/packet.cpp
index 771c413..7bd1465 100644
--- a/packet.cpp
+++ b/packet.cpp
@@ -17,7 +17,6 @@ u64_t dup_packet_send_count=0;
 u64_t packet_recv_count=0;
 u64_t dup_packet_recv_count=0;
 typedef u64_t anti_replay_seq_t;
-const u32_t anti_replay_buff_size=10000;
 int disable_replay_filter=0;
 
 int random_drop=0;
@@ -27,68 +26,6 @@ char key_string[1000]= "secret key";
 int local_listen_fd=-1;
 
 
-
-struct anti_replay_t
-{
-	u64_t max_packet_received;
-
-	u64_t replay_buffer[anti_replay_buff_size];
-	unordered_set<u64_t> st;
-	u32_t const_id;
-	u32_t anti_replay_seq;
-	int index;
-	anti_replay_seq_t get_new_seq_for_send()
-	{
-		if(const_id==0) prepare();
-		anti_replay_seq_t res=const_id;
-		res<<=32u;
-		anti_replay_seq++;
-		res|=anti_replay_seq;
-		const_id=0;
-		return res;
-	}
-	void prepare()
-	{
-		anti_replay_seq=get_true_random_number();//random first seq
-		const_id=get_true_random_number_nz();
-	}
-	anti_replay_t()
-	{
-		memset(replay_buffer,0,sizeof(replay_buffer));
-		st.rehash(anti_replay_buff_size*10);
-		max_packet_received=0;
-		index=0;
-	}
-
-	int is_vaild(u64_t seq)
-	{
-		if(const_id==0) prepare();
-		//if(disable_replay_filter) return 1;
-		if(seq==0)
-		{
-			mylog(log_debug,"seq=0\n");
-			return 0;
-		}
-		if(st.find(seq)!=st.end() )
-		{
-			mylog(log_trace,"seq %llx exist\n",seq);
-			return 0;
-		}
-
-		if(replay_buffer[index]!=0)
-		{
-			assert(st.find(replay_buffer[index])!=st.end());
-			st.erase(replay_buffer[index]);
-		}
-		replay_buffer[index]=seq;
-		st.insert(seq);
-		index++;
-		if(index==int(anti_replay_buff_size)) index=0;
-
-		return 1; //for complier check
-	}
-}anti_replay;
-
 void encrypt_0(char * input,int &len,char *key)
 {
 	int i,j;
@@ -110,32 +47,6 @@ void decrypt_0(char * input,int &len,char *key)
 		input[i]^=key[j];
 	}
 }
-int add_seq(char * data,int &data_len )
-{
-	if(data_len<0) return -1;
-	anti_replay_seq_t seq=anti_replay.get_new_seq_for_send();
-	seq=hton64(seq);
-	memcpy(data+data_len,&seq,sizeof(seq));
-	data_len+=sizeof(seq);
-	return 0;
-}
-int remove_seq(char * data,int &data_len)
-{
-	anti_replay_seq_t seq;
-	if(data_len<int(sizeof(seq))) return -1;
-	data_len-=sizeof(seq);
-	memcpy(&seq,data+data_len,sizeof(seq));
-	seq=ntoh64(seq);
-	if(anti_replay.is_vaild(seq)==0)
-	{
-		if(disable_replay_filter==1)  //todo inefficient code,why did i put it here???
-			return 0;
-		mylog(log_trace,"seq %llx dropped bc of replay-filter\n ",seq);
-		return -1;
-	}
-	packet_recv_count++;
-	return 0;
-}
 int do_obscure(const char * input, int in_len,char *output,int &out_len)
 {
 	//memcpy(output,input,in_len);
@@ -305,7 +216,7 @@ unsigned int crc32h(unsigned char *message,int len) {
    return ~crc;
 }
 
-int put_conv(u32_t conv,char * input,int len_in,char *&output,int &len_out)
+int put_conv(u32_t conv,const char * input,int len_in,char *&output,int &len_out)
 {
 	static char buf[buf_len];
 	output=buf;
@@ -318,12 +229,12 @@ int put_conv(u32_t conv,char * input,int len_in,char *&output,int &len_out)
 	memcpy(output+len_in+(int)(sizeof(n_conv)),&crc32_n,sizeof(crc32_n));
 	return 0;
 }
-int get_conv(u32_t &conv,char *input,int len_in,char *&output,int &len_out )
+int get_conv(u32_t &conv,const char *input,int len_in,char *&output,int &len_out )
 {
 	u32_t n_conv;
 	memcpy(&n_conv,input,sizeof(n_conv));
 	conv=ntohl(n_conv);
-	output=input+sizeof(n_conv);
+	output=(char *)input+sizeof(n_conv);
 	u32_t crc32_n;
 	len_out=len_in-(int)sizeof(n_conv)-(int)sizeof(crc32_n);
 	if(len_out<0)
diff --git a/packet.h b/packet.h
index 95eb484..1f7d0a5 100644
--- a/packet.h
+++ b/packet.h
@@ -37,7 +37,7 @@ int de_obscure(const char * input, int in_len,char *output,int &out_len);
 int sendto_ip_port (u32_t ip,int port,char * buf, int len,int flags);
 int send_fd (int fd,char * buf, int len,int flags);
 
-int put_conv(u32_t conv,char * input,int len_in,char *&output,int &len_out);
-int get_conv(u32_t &conv,char *input,int len_in,char *&output,int &len_out );
+int put_conv(u32_t conv,const char * input,int len_in,char *&output,int &len_out);
+int get_conv(u32_t &conv,const char *input,int len_in,char *&output,int &len_out );
 
 #endif /* PACKET_H_ */