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msg.hpp
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396 lines (361 loc) · 10 KB
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#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <fcntl.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <iostream>
#include <filesystem>
#include "opencv2/opencv.hpp"
using namespace std;
using namespace cv;
#define LEN_OFFSET 4
#define MSG_OFFSET 68
#define BUFF_SIZE 1024UL
#define ERR_EXIT(a){ perror(a); exit(1); }
struct Socket{
Socket(int fd = 0, bool blocking = false):fd(fd),blocking(blocking){
msg_mode = blocking ? MSG_WAITALL : MSG_DONTWAIT;
}
int fd;
bool do_write = false; // true if write is needed after msg
ulong len = 0;
ulong cur = 0;
bool blocking;
int msg_mode;
string buf;
char c_buf[BUFF_SIZE] = {};
// int stat = TYPE_NIL;
string type;
string header;
// For file
string filename;
int file_fd = -1;
// For mpg
Mat video_img;
VideoCapture cap;
int width, height;
int imgSize;
void init();
void gen_header(string, ulong);
int recv_all(bool output);
int recv_header();
int send_all();
int send_header();
void process();
void play();
bool header_ok(){
return cur >= MSG_OFFSET;
}
bool msg_ok(){
return cur == len;
}
void open_file(int oflag=O_RDONLY){
if ((file_fd = open(filename.c_str(), oflag)) < 0)
return;
len = lseek(file_fd, 0, SEEK_END);
lseek(file_fd, 0, SEEK_SET);
}
int __recv_all(bool);
int __recv_msg(bool);
int __recv_file();
int __recv_mpg();
int __send_all();
int __send_msg();
int __send_file();
int __send_mpg();
void __clear_c_buf(){
memset(c_buf, 0, sizeof(char) * BUFF_SIZE);
}
};
string hton_header(string type, ulong len){ // len: message len
string &s = type;
len += MSG_OFFSET;
for (int i = 0; i != MSG_OFFSET - LEN_OFFSET; ++i){
s.push_back((char)(len & 0xff));
len >>= 8;
}
return s;
}
string hton_str(string s, string type){
auto header = hton_header(type, s.length());
return header + s;
}
void Socket::init(){
len = cur = 0;
buf.clear();
type.clear();
header.clear();
file_fd = -1;
}
// void Socket::format_buf(string type){
// buf = hton_str(buf, type);
// len = buf.size();
// }
void Socket::gen_header(string t="", ulong tlen=-1){
type = (t == "" ? type : t);
len = (tlen == -1 ? len : tlen);
header = hton_header(type, len);
len += header.length();
}
int Socket::recv_all(bool output=false){
int ret = 0;
if (blocking){
while ((ret = __recv_all(output)) == 0);
return ret;
}
// Get header and content
// while (!msg_ok() || !header_ok())
// cout << cur << ' ' << len << '!' << endl;
if (!msg_ok() || !header_ok())
if ((ret = __recv_all(output)) < 0)
return -1;
return ret;
}
int Socket::recv_header(){
// Read type
__clear_c_buf();
if (cur < LEN_OFFSET){
int ret = recv(fd, c_buf, LEN_OFFSET - cur, msg_mode);
if ((ret < 0 && errno != EAGAIN) || ret == 0)
return -1;
type += string(c_buf);
cur = max(cur, cur + ret);
return 0;
}
// Read length
else if (cur < MSG_OFFSET){
int ret = recv(fd, c_buf, MSG_OFFSET - cur, msg_mode);
if ((ret < 0 && errno != EAGAIN) || ret == 0) // Lost connection(?)
return -1;
for (int i = 0; i < ret; ++i){
int idx = cur + i - LEN_OFFSET;
len += ((ulong)((u_char)(c_buf[i]))) << (8 * idx); // So ugly
}
cur = max(cur + ret, cur);
return 0;
}
return -1;
}
int Socket::send_all(){
int ret = 0;
if (blocking){
while ((ret = __send_all()) == 0);
return ret;
}
// Get header and content
// while (!msg_ok() || !header_ok())
if (!msg_ok() || !header_ok())
if ((ret = __send_all()) < 0)
return -1;
return ret;
}
int Socket::__send_all(){
int ret;
if (!header_ok())
if ((ret = send_header()) < 0 || !header_ok())
return ret;
if (type == ".NIL")
return 1;
else if (type == ".MSG")
return __send_msg();
else if (type == ".FIL")
return __send_file();
else if (type == ".MPG")
return __send_mpg();
return cur == len ? 1 : 0;
}
int Socket::send_header(){
if (header.empty())
gen_header();
int ret = send(fd, header.c_str() + cur, MSG_OFFSET - cur, msg_mode);
if ((ret < 0 && errno != EAGAIN) || ret == 0)
return -1;
cur = max(cur + ret, cur);
return 0;
}
void Socket::process(){
if (type == ".MSG"){
if (buf.substr(0, 3) == "PUT"){
filename = buf.substr(4);
init();
}
else if (buf.substr(0, 3) == "GET"){
filename = buf.substr(4);
init();
do_write = true;
type = ".FIL";
open_file();
if (file_fd < 0)
type = ".NIL";
gen_header();
}
else if (buf.substr(0, 2) == "LS"){
init();
do_write = true;
for (const auto &entry : filesystem::directory_iterator("./"))
buf += entry.path().filename().string() + "\n";
gen_header(".MSG", buf.length());
}
else if (buf.substr(0, 4) == "ASK "){
string filename = buf.substr(4);
init();
do_write = true;
if (access(filename.c_str(), O_RDONLY) < 0){
gen_header(".NIL", 0);
return;
}
cap = VideoCapture(filename);
width = cap.get(CV_CAP_PROP_FRAME_WIDTH);
height = cap.get(CV_CAP_PROP_FRAME_HEIGHT);
video_img = Mat::zeros(height, width, CV_8UC3);
imgSize = video_img.total() * video_img.elemSize();
buf = "RES " + to_string(width) + "x" + to_string(height);
gen_header(".MSG", buf.length());
}
else if (buf.substr(0, 4) == "PLAY"){
init();
do_write = true;
cap >> video_img;
gen_header(".MPG", imgSize);
}
else if (buf.substr(0, 4) == "EXIT"){
init();
cap.release();
}
}
else if (type == ".FIL"){
init();
}
}
/* Play mpg (only support blocking mode) */
void Socket::play(){
video_img = Mat::zeros(height, width, CV_8UC3);
// Ensure memory is continuos (for efficiency issue)
if (!video_img.isContinuous())
video_img = video_img.clone();
imgSize = video_img.total() * video_img.elemSize();
// First Hello message
init();
buf = "PLAY";
gen_header(".MSG", buf.length());
send_all();
// Main loop
while (true){
// Get frame
// uchar *iptr = video_img.data;
// recv(fd, iptr, imgSize, 0);
init();
recv_all();
// Show frame
imshow("Video", video_img);
// Continue or break
char c = (char)waitKey(33.3333);
init();
buf = (c == 27) ? "EXIT" : "PLAY";
gen_header(".MSG", buf.length());
send_all();
if (c == 27)
break;
}
destroyAllWindows();
}
// Return 1 if finish else 0
int Socket::__recv_all(bool output=false){
int ret;
if (!header_ok())
if ((ret = recv_header()) < 0 || !header_ok())
return ret;
if (type == ".NIL")
return 1;
else if (type == ".MSG")
return __recv_msg(output);
else if (type == ".FIL")
return __recv_file();
else if (type == ".MPG")
return __recv_mpg();
return (len == cur) ? 1 : 0;
}
int Socket::__recv_msg(bool output=false){
if (cur == len) return 1;
__clear_c_buf();
int ret = recv(fd, c_buf, min(len - cur, BUFF_SIZE - 1), msg_mode);
if ((ret < 0 && errno != EAGAIN) || ret == 0) // Lost connection (?)
return -1;
if (output)
printf("%s", c_buf);
else
buf += string(c_buf);
cur = max(cur, cur + ret);
return cur == len ? 1 : 0;
}
int Socket::__recv_file(){
__clear_c_buf();
if (len == MSG_OFFSET){
int fd = creat(filename.c_str(), 0600);
if (fd > 0) close(fd);
return 1;
}
if (file_fd < 0)
file_fd = open(filename.c_str(), O_CREAT | O_WRONLY, 0600);
int ret = recv(fd, c_buf, min(len - cur, BUFF_SIZE), msg_mode);
if ((ret < 0 && errno != EAGAIN) || ret == 0)
return -1;
write(file_fd, c_buf, ret);
cur = max(cur + ret, cur);
if (cur == len)
close(file_fd), file_fd = -1;
return cur == len ? 1 : 0;
}
int Socket::__recv_mpg(){
if (cur == len) return 1; // impossible?
int ret = recv(fd, video_img.data + cur - MSG_OFFSET, len - cur, msg_mode);
if ((ret < 0 && errno != EAGAIN) || ret == 0)
return -1;
cur = max(cur, cur + ret);
return cur == len ? 1 : 0;
}
int Socket::__send_msg(){
if (len == MSG_OFFSET)
return 1;
int ret = send(fd, buf.c_str() + cur - MSG_OFFSET, len - cur, msg_mode);
if ((ret < 0 && errno != EAGAIN) || ret == 0)
return -1;
cur = max(cur + ret, cur);
if (cur == len)
do_write = false;
return cur == len ? 1 : 0;
}
int Socket::__send_file(){
if (len == MSG_OFFSET){
do_write = false;
close(file_fd);
file_fd = -1;
return 1;
}
__clear_c_buf();
int read_b = read(file_fd, c_buf, BUFF_SIZE);
int send_b = send(fd, c_buf, read_b, msg_mode);
lseek(file_fd, (send_b < 0) ? -read_b : send_b - read_b, SEEK_CUR);
if ((send_b < 0 && errno != EAGAIN) || send_b == 0)
return -1;
cur = max(cur + send_b, cur);
if (cur == len){
do_write = false;
close(file_fd);
file_fd = -1;
}
return cur == len ? 1 : 0;
}
int Socket::__send_mpg(){
if (len == MSG_OFFSET) // I think it's impossible
return 1;
int ret = send(fd, video_img.data + cur - MSG_OFFSET, len - cur, msg_mode);
if ((ret < 0 && errno != EAGAIN) || ret == 0)
return -1;
cur = max(cur + ret, cur);
if (cur == len)
do_write = false;
return cur == len ? 1 : 0;
}