501 lines
14 KiB
C++
501 lines
14 KiB
C++
#include <map>
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#include <string.h>
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#include <stdlib.h>
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#include <sys/time.h>
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#include <arpa/inet.h>
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unsigned int getNowMS(){
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timeval t;
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gettimeofday(&t, 0);
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return t.tv_sec + t.tv_usec/1000;
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}
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unsigned int chunk_rec_max = 128;
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unsigned int chunk_snd_max = 128;
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unsigned int rec_window_size = 0xFA00;
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unsigned int snd_window_size = 1024*500;
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unsigned int rec_window_at = 0;
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unsigned int snd_window_at = 0;
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unsigned int rec_cnt = 0;
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unsigned int snd_cnt = 0;
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unsigned int firsttime;
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struct chunkinfo {
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unsigned int cs_id;
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unsigned int timestamp;
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unsigned int len;
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unsigned int real_len;
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unsigned int len_left;
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unsigned char msg_type_id;
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unsigned int msg_stream_id;
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};//chunkinfo
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struct chunkpack {
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unsigned char chunktype;
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unsigned int cs_id;
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unsigned int timestamp;
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unsigned int len;
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unsigned int real_len;
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unsigned int len_left;
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unsigned char msg_type_id;
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unsigned int msg_stream_id;
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unsigned char * data;
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};//chunkpack
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//clean a chunk so that it may be re-used without memory leaks
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void scrubChunk(struct chunkpack c){
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if (c.data){free(c.data);}
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c.data = 0;
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c.real_len = 0;
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}//scrubChunk
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//ugly global, but who cares...
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std::map<unsigned int, chunkinfo> prevmap;
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//return previous packet of this cs_id
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chunkinfo GetPrev(unsigned int cs_id){
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return prevmap[cs_id];
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}//GetPrev
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//store packet information of last packet of this cs_id
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void PutPrev(chunkpack prev){
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prevmap[prev.cs_id].timestamp = prev.timestamp;
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prevmap[prev.cs_id].len = prev.len;
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prevmap[prev.cs_id].real_len = prev.real_len;
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prevmap[prev.cs_id].len_left = prev.len_left;
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prevmap[prev.cs_id].msg_type_id = prev.msg_type_id;
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prevmap[prev.cs_id].msg_stream_id = prev.msg_stream_id;
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}//PutPrev
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//ugly global, but who cares...
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std::map<unsigned int, chunkinfo> sndprevmap;
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//return previous packet of this cs_id
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chunkinfo GetSndPrev(unsigned int cs_id){
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return sndprevmap[cs_id];
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}//GetPrev
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//store packet information of last packet of this cs_id
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void PutSndPrev(chunkpack prev){
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sndprevmap[prev.cs_id].cs_id = prev.cs_id;
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sndprevmap[prev.cs_id].timestamp = prev.timestamp;
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sndprevmap[prev.cs_id].len = prev.len;
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sndprevmap[prev.cs_id].real_len = prev.real_len;
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sndprevmap[prev.cs_id].len_left = prev.len_left;
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sndprevmap[prev.cs_id].msg_type_id = prev.msg_type_id;
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sndprevmap[prev.cs_id].msg_stream_id = prev.msg_stream_id;
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}//PutPrev
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//sends the chunk over the network
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void SendChunk(chunkpack ch){
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unsigned char tmp;
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unsigned int tmpi;
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unsigned char chtype = 0x00;
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chunkinfo prev = GetSndPrev(ch.cs_id);
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ch.timestamp -= firsttime;
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if (prev.cs_id == ch.cs_id){
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if (ch.msg_stream_id == prev.msg_stream_id){
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chtype = 0x40;//do not send msg_stream_id
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if (ch.len == prev.len){
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if (ch.msg_type_id == prev.msg_type_id){
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chtype = 0x80;//do not send len and msg_type_id
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if (ch.timestamp == prev.timestamp){
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chtype = 0xC0;//do not send timestamp
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}
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}
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}
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}
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}
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if (ch.cs_id <= 63){
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tmp = chtype | ch.cs_id; DDV_write(&tmp, 1, 1, CONN_fd);
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snd_cnt+=1;
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}else{
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if (ch.cs_id <= 255+64){
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tmp = chtype | 0; DDV_write(&tmp, 1, 1, CONN_fd);
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tmp = ch.cs_id - 64; DDV_write(&tmp, 1, 1, CONN_fd);
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snd_cnt+=2;
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}else{
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tmp = chtype | 1; DDV_write(&tmp, 1, 1, CONN_fd);
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tmpi = ch.cs_id - 64;
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tmp = tmpi % 256; DDV_write(&tmp, 1, 1, CONN_fd);
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tmp = tmpi / 256; DDV_write(&tmp, 1, 1, CONN_fd);
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snd_cnt+=3;
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}
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}
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unsigned int ntime = 0;
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if (chtype != 0xC0){
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//timestamp or timestamp diff
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if (chtype == 0x00){
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tmpi = ch.timestamp;
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if (tmpi >= 0x00ffffff){ntime = tmpi; tmpi = 0x00ffffff;}
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tmp = tmpi / (256*256); DDV_write(&tmp, 1, 1, CONN_fd);
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tmp = tmpi / 256; DDV_write(&tmp, 1, 1, CONN_fd);
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tmp = tmpi % 256; DDV_write(&tmp, 1, 1, CONN_fd);
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snd_cnt+=3;
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}else{
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tmpi = ch.timestamp - prev.timestamp;
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if (tmpi >= 0x00ffffff){ntime = tmpi; tmpi = 0x00ffffff;}
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tmp = tmpi / (256*256); DDV_write(&tmp, 1, 1, CONN_fd);
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tmp = tmpi / 256; DDV_write(&tmp, 1, 1, CONN_fd);
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tmp = tmpi % 256; DDV_write(&tmp, 1, 1, CONN_fd);
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snd_cnt+=3;
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}
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if (chtype != 0x80){
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//len
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tmpi = ch.len;
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tmp = tmpi / (256*256); DDV_write(&tmp, 1, 1, CONN_fd);
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tmp = tmpi / 256; DDV_write(&tmp, 1, 1, CONN_fd);
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tmp = tmpi % 256; DDV_write(&tmp, 1, 1, CONN_fd);
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snd_cnt+=3;
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//msg type id
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tmp = ch.msg_type_id; DDV_write(&tmp, 1, 1, CONN_fd);
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snd_cnt+=1;
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if (chtype != 0x40){
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//msg stream id
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tmp = ch.msg_stream_id % 256; DDV_write(&tmp, 1, 1, CONN_fd);
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tmp = ch.msg_stream_id / 256; DDV_write(&tmp, 1, 1, CONN_fd);
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tmp = ch.msg_stream_id / (256*256); DDV_write(&tmp, 1, 1, CONN_fd);
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tmp = ch.msg_stream_id / (256*256*256); DDV_write(&tmp, 1, 1, CONN_fd);
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snd_cnt+=4;
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}
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}
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}
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//support for 0x00ffffff timestamps
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if (ntime){
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tmp = ntime / (256*256*256); DDV_write(&tmp, 1, 1, CONN_fd);
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tmp = ntime / (256*256); DDV_write(&tmp, 1, 1, CONN_fd);
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tmp = ntime / 256; DDV_write(&tmp, 1, 1, CONN_fd);
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tmp = ntime % 256; DDV_write(&tmp, 1, 1, CONN_fd);
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snd_cnt+=4;
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}
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ch.len_left = 0;
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while (ch.len_left < ch.len){
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tmpi = ch.len - ch.len_left;
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if (tmpi > chunk_snd_max){tmpi = chunk_snd_max;}
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DDV_write((ch.data + ch.len_left), 1, tmpi, CONN_fd);
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snd_cnt+=tmpi;
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ch.len_left += tmpi;
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if (ch.len_left < ch.len){
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if (ch.cs_id <= 63){
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tmp = 0xC0 + ch.cs_id; DDV_write(&tmp, 1, 1, CONN_fd);
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snd_cnt+=1;
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}else{
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if (ch.cs_id <= 255+64){
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tmp = 0xC0; DDV_write(&tmp, 1, 1, CONN_fd);
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tmp = ch.cs_id - 64; DDV_write(&tmp, 1, 1, CONN_fd);
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snd_cnt+=2;
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}else{
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tmp = 0xC1; DDV_write(&tmp, 1, 1, CONN_fd);
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tmpi = ch.cs_id - 64;
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tmp = tmpi % 256; DDV_write(&tmp, 1, 1, CONN_fd);
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tmp = tmpi / 256; DDV_write(&tmp, 1, 1, CONN_fd);
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snd_cnt+=4;
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}
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}
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}
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}
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PutSndPrev(ch);
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}//SendChunk
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//sends a chunk
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void SendChunk(unsigned int cs_id, unsigned char msg_type_id, unsigned int msg_stream_id, std::string data){
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chunkpack ch;
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ch.cs_id = cs_id;
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ch.timestamp = getNowMS();
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ch.len = data.size();
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ch.real_len = data.size();
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ch.len_left = 0;
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ch.msg_type_id = msg_type_id;
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ch.msg_stream_id = msg_stream_id;
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ch.data = (unsigned char*)malloc(data.size());
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memcpy(ch.data, data.c_str(), data.size());
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SendChunk(ch);
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free(ch.data);
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}//SendChunk
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//sends a media chunk
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void SendMedia(unsigned char msg_type_id, unsigned char * data, int len, unsigned int ts){
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chunkpack ch;
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ch.cs_id = msg_type_id;
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ch.timestamp = ts;
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ch.len = len;
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ch.real_len = len;
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ch.len_left = 0;
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ch.msg_type_id = msg_type_id;
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ch.msg_stream_id = 1;
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ch.data = (unsigned char*)malloc(len);
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memcpy(ch.data, data, len);
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SendChunk(ch);
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free(ch.data);
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}//SendMedia
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//sends a control message
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void SendCTL(unsigned char type, unsigned int data){
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chunkpack ch;
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ch.cs_id = 2;
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ch.timestamp = getNowMS();
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ch.len = 4;
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ch.real_len = 4;
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ch.len_left = 0;
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ch.msg_type_id = type;
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ch.msg_stream_id = 0;
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ch.data = (unsigned char*)malloc(4);
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data = htonl(data);
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memcpy(ch.data, &data, 4);
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SendChunk(ch);
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free(ch.data);
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}//SendCTL
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//sends a control message
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void SendCTL(unsigned char type, unsigned int data, unsigned char data2){
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chunkpack ch;
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ch.cs_id = 2;
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ch.timestamp = getNowMS();
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ch.len = 5;
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ch.real_len = 5;
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ch.len_left = 0;
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ch.msg_type_id = type;
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ch.msg_stream_id = 0;
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ch.data = (unsigned char*)malloc(5);
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data = htonl(data);
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memcpy(ch.data, &data, 4);
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ch.data[4] = data2;
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SendChunk(ch);
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free(ch.data);
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}//SendCTL
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//sends a usr control message
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void SendUSR(unsigned char type, unsigned int data){
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chunkpack ch;
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ch.cs_id = 2;
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ch.timestamp = getNowMS();
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ch.len = 6;
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ch.real_len = 6;
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ch.len_left = 0;
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ch.msg_type_id = 4;
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ch.msg_stream_id = 0;
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ch.data = (unsigned char*)malloc(6);
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data = htonl(data);
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memcpy(ch.data+2, &data, 4);
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ch.data[0] = 0;
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ch.data[1] = type;
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SendChunk(ch);
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free(ch.data);
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}//SendUSR
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//sends a usr control message
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void SendUSR(unsigned char type, unsigned int data, unsigned int data2){
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chunkpack ch;
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ch.cs_id = 2;
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ch.timestamp = getNowMS();
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ch.len = 10;
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ch.real_len = 10;
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ch.len_left = 0;
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ch.msg_type_id = 4;
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ch.msg_stream_id = 0;
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ch.data = (unsigned char*)malloc(10);
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data = htonl(data);
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data2 = htonl(data2);
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memcpy(ch.data+2, &data, 4);
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memcpy(ch.data+6, &data2, 4);
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ch.data[0] = 0;
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ch.data[1] = type;
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SendChunk(ch);
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free(ch.data);
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}//SendUSR
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//get a chunk from standard input
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struct chunkpack getChunk(){
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gettimeofday(&lastrec, 0);
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struct chunkpack ret;
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unsigned char temp;
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DDV_read(&(ret.chunktype), 1, 1, CONN_fd);
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rec_cnt++;
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//read the chunkstream ID properly
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switch (ret.chunktype & 0x3F){
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case 0:
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DDV_read(&temp, 1, 1, CONN_fd);
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rec_cnt++;
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ret.cs_id = temp + 64;
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break;
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case 1:
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.cs_id = temp + 64;
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.cs_id += temp * 256;
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rec_cnt+=2;
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break;
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default:
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ret.cs_id = ret.chunktype & 0x3F;
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break;
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}
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chunkinfo prev = GetPrev(ret.cs_id);
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//process the rest of the header, for each chunk type
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switch (ret.chunktype & 0xC0){
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case 0x00:
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.timestamp = temp*256*256;
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.timestamp += temp*256;
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.timestamp += temp;
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.len = temp*256*256;
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.len += temp*256;
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.len += temp;
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ret.len_left = 0;
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.msg_type_id = temp;
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.msg_stream_id = temp;
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.msg_stream_id += temp*256;
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.msg_stream_id += temp*256*256;
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.msg_stream_id += temp*256*256*256;
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rec_cnt+=11;
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break;
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case 0x40:
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.timestamp = temp*256*256;
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.timestamp += temp*256;
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.timestamp += temp;
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ret.timestamp += prev.timestamp;
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.len = temp*256*256;
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.len += temp*256;
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.len += temp;
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ret.len_left = 0;
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.msg_type_id = temp;
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ret.msg_stream_id = prev.msg_stream_id;
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rec_cnt+=7;
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break;
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case 0x80:
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.timestamp = temp*256*256;
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.timestamp += temp*256;
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.timestamp += temp;
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ret.timestamp += prev.timestamp;
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ret.len = prev.len;
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ret.len_left = prev.len_left;
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ret.msg_type_id = prev.msg_type_id;
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ret.msg_stream_id = prev.msg_stream_id;
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rec_cnt+=3;
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break;
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case 0xC0:
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ret.timestamp = prev.timestamp;
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ret.len = prev.len;
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ret.len_left = prev.len_left;
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ret.msg_type_id = prev.msg_type_id;
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ret.msg_stream_id = prev.msg_stream_id;
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break;
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}
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//calculate chunk length, real length, and length left till complete
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if (ret.len_left > 0){
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ret.real_len = ret.len_left;
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ret.len_left -= ret.real_len;
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}else{
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ret.real_len = ret.len;
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}
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if (ret.real_len > chunk_rec_max){
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ret.len_left += ret.real_len - chunk_rec_max;
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ret.real_len = chunk_rec_max;
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}
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//read extended timestamp, if neccesary
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if (ret.timestamp == 0x00ffffff){
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.timestamp = temp*256*256*256;
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.timestamp += temp*256*256;
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.timestamp += temp*256;
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DDV_read(&temp, 1, 1, CONN_fd);
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ret.timestamp += temp;
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rec_cnt+=4;
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}
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//read data if length > 0, and allocate it
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if (ret.real_len > 0){
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ret.data = (unsigned char*)malloc(ret.real_len);
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DDV_read(ret.data, 1, ret.real_len, CONN_fd);
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rec_cnt+=ret.real_len;
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}else{
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ret.data = 0;
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}
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PutPrev(ret);
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return ret;
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}//getChunk
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//adds newchunk to global list of unfinished chunks, re-assembling them complete
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//returns pointer to chunk when a chunk is finished, 0 otherwise
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//removes pointed to chunk from internal list if returned, without cleanup
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// (cleanup performed in getWholeChunk function)
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chunkpack * AddChunkPart(chunkpack newchunk){
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chunkpack * p;
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unsigned char * tmpdata = 0;
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static std::map<unsigned int, chunkpack *> ch_lst;
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std::map<unsigned int, chunkpack *>::iterator it;
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it = ch_lst.find(newchunk.cs_id);
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if (it == ch_lst.end()){
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p = (chunkpack*)malloc(sizeof(chunkpack));
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*p = newchunk;
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p->data = (unsigned char*)malloc(p->real_len);
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memcpy(p->data, newchunk.data, p->real_len);
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if (p->len_left == 0){return p;}
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ch_lst[newchunk.cs_id] = p;
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}else{
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p = it->second;
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tmpdata = (unsigned char*)realloc(p->data, p->real_len + newchunk.real_len);
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if (tmpdata == 0){
|
|
#ifdef DEBUG
|
|
fprintf(stderr, "Error allocating memory!\n");
|
|
#endif
|
|
return 0;
|
|
}
|
|
p->data = tmpdata;
|
|
memcpy(p->data+p->real_len, newchunk.data, newchunk.real_len);
|
|
p->real_len += newchunk.real_len;
|
|
p->len_left -= newchunk.real_len;
|
|
if (p->len_left <= 0){
|
|
ch_lst.erase(it);
|
|
return p;
|
|
}else{
|
|
ch_lst[newchunk.cs_id] = p;//pointer may have changed
|
|
}
|
|
}
|
|
return 0;
|
|
}//AddChunkPart
|
|
|
|
//grabs chunks until a whole one comes in, then returns that
|
|
chunkpack getWholeChunk(){
|
|
static chunkpack gwc_next, gwc_complete;
|
|
static bool clean = false;
|
|
int counter = 0;
|
|
if (!clean){gwc_complete.data = 0; clean = true;}//prevent brain damage
|
|
chunkpack * ret = 0;
|
|
scrubChunk(gwc_complete);
|
|
while (counter < 10000){
|
|
gwc_next = getChunk();
|
|
ret = AddChunkPart(gwc_next);
|
|
scrubChunk(gwc_next);
|
|
if (ret){
|
|
gwc_complete = *ret;
|
|
free(ret);//cleanup returned chunk
|
|
return gwc_complete;
|
|
}
|
|
if (socketError){break;}
|
|
counter++;
|
|
}
|
|
gwc_complete.msg_type_id = 0;
|
|
return gwc_complete;
|
|
}//getWholeChunk
|