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#include "rfb.h"
#include "memif.h"
#include <sys/types.h>
#include <sys/socket.h>
#include <sched.h>
#include <netinet/in.h>
#include <unistd.h>
#include <cstdlib>
#include <stdexcept>
#include <string>
#include <cstring>
#include <cinttypes>
using namespace std::placeholders;
rfb_t::rfb_t(int display)
: sockfd(-1), afd(-1),
memif(0), addr(0), width(0), height(0), bpp(0), display(display),
thread(pthread_self()), fb1(0), fb2(0), read_pos(0),
lock(PTHREAD_MUTEX_INITIALIZER)
{
register_command(0, std::bind(&rfb_t::handle_configure, this, _1), "configure");
register_command(1, std::bind(&rfb_t::handle_set_address, this, _1), "set_address");
}
void* rfb_thread_main(void* arg)
{
((rfb_t*)arg)->thread_main();
return 0;
}
void rfb_t::thread_main()
{
pthread_mutex_lock(&lock);
int port = 5900 + display;
sockfd = socket(PF_INET, SOCK_STREAM, 0);
if (sockfd < 0)
throw std::runtime_error("could not acquire tcp socket");
struct sockaddr_in saddr, caddr;
saddr.sin_family = AF_INET;
saddr.sin_addr.s_addr = INADDR_ANY;
saddr.sin_port = htons(port);
if (bind(sockfd, (struct sockaddr*)&saddr, sizeof(saddr)) < 0)
throw std::runtime_error("could not bind to port " + std::to_string(port));
if (listen(sockfd, 0) < 0)
throw std::runtime_error("could not listen on port " + std::to_string(port));
socklen_t clen = sizeof(caddr);
afd = accept(sockfd, (struct sockaddr*)&caddr, &clen);
if (afd < 0)
throw std::runtime_error("could not accept connection");
std::string version = "RFB 003.003\n";
write(version);
if (read() != version)
throw std::runtime_error("bad client version");
write(str(uint32_t(htonl(1))));
read(); // clientinit
std::string serverinit;
serverinit += str(uint16_t(htons(width)));
serverinit += str(uint16_t(htons(height)));
serverinit += pixel_format();
std::string name = "RISC-V";
serverinit += str(uint32_t(htonl(name.length())));
serverinit += name;
write(serverinit);
pthread_mutex_unlock(&lock);
while (memif == NULL)
sched_yield();
while (memif != NULL)
{
std::string s = read();
if (s.length() < 4)
break; //throw std::runtime_error("bad command");
switch (s[0])
{
case 0: set_pixel_format(s); break;
case 2: set_encodings(s); break;
case 3: break;
}
}
pthread_mutex_lock(&lock);
close(afd);
close(sockfd);
afd = -1;
sockfd = -1;
pthread_mutex_unlock(&lock);
thread_main();
}
rfb_t::~rfb_t()
{
memif = 0;
if (!pthread_equal(pthread_self(), thread))
pthread_join(thread, 0);
delete [] fb1;
delete [] fb2;
}
void rfb_t::set_encodings(const std::string& s)
{
uint16_t n = htons(*(uint16_t*)&s[2]);
for (size_t b = s.length(); b < 4U+4U*n; b += read().length());
}
void rfb_t::set_pixel_format(const std::string& s)
{
if (s.length() != 20 || s.substr(4, 16) != pixel_format())
throw std::runtime_error("bad pixel format");
}
void rfb_t::fb_update(const std::string& s)
{
std::string u;
u += str(uint8_t(0));
u += str(uint8_t(0));
u += str(uint16_t(htons(1)));
u += str(uint16_t(htons(0)));
u += str(uint16_t(htons(0)));
u += str(uint16_t(htons(width)));
u += str(uint16_t(htons(height)));
u += str(uint32_t(htonl(0)));
u += std::string((char*)fb1, fb_bytes());
try
{
write(u);
}
catch (std::runtime_error& e)
{
}
}
void rfb_t::tick()
{
if (fb_bytes() == 0 || memif == NULL)
return;
memif->read(addr + read_pos, FB_ALIGN, const_cast<char*>(fb2 + read_pos));
read_pos = (read_pos + FB_ALIGN) % fb_bytes();
if (read_pos == 0)
{
std::swap(fb1, fb2);
if (pthread_mutex_trylock(&lock) == 0)
{
fb_update("");
pthread_mutex_unlock(&lock);
}
}
}
std::string rfb_t::pixel_format()
{
int red_bits = 8, green_bits = 8, blue_bits = 8;
int bpp = red_bits + green_bits + blue_bits;
while (bpp & (bpp-1)) bpp++;
std::string fmt;
fmt += str(uint8_t(bpp));
fmt += str(uint8_t(red_bits + green_bits + blue_bits));
fmt += str(uint8_t(0)); // little-endian
fmt += str(uint8_t(1)); // true color
fmt += str(uint16_t(htons((1<<red_bits)-1)));
fmt += str(uint16_t(htons((1<<green_bits)-1)));
fmt += str(uint16_t(htons((1<<blue_bits)-1)));
fmt += str(uint8_t(blue_bits+green_bits));
fmt += str(uint8_t(blue_bits));
fmt += str(uint8_t(0));
fmt += str(uint16_t(0)); // pad
fmt += str(uint8_t(0)); // pad
return fmt;
}
void rfb_t::write(const std::string& s)
{
if ((size_t)::write(afd, s.c_str(), s.length()) != s.length())
throw std::runtime_error("could not write");
}
std::string rfb_t::read()
{
char buf[2048];
ssize_t len = ::read(afd, buf, sizeof(buf));
if (len < 0)
throw std::runtime_error("could not read");
if (len == sizeof(buf))
throw std::runtime_error("received oversized packet");
return std::string(buf, len);
}
void rfb_t::handle_configure(command_t cmd)
{
if (fb1)
throw std::runtime_error("you must only set the rfb configuration once");
width = cmd.payload();
height = cmd.payload() >> 16;
bpp = cmd.payload() >> 32;
if (bpp != 32)
throw std::runtime_error("rfb requires 32 bpp true color");
if (fb_bytes() % FB_ALIGN != 0)
throw std::runtime_error("rfb size must be a multiple of " + std::to_string(FB_ALIGN));
fb1 = new char[fb_bytes()];
fb2 = new char[fb_bytes()];
if (pthread_create(&thread, 0, rfb_thread_main, this))
throw std::runtime_error("could not create thread");
cmd.respond(1);
}
void rfb_t::handle_set_address(command_t cmd)
{
addr = cmd.payload();
if (addr % FB_ALIGN != 0)
throw std::runtime_error("rfb address must be " + std::to_string(FB_ALIGN) + "-byte aligned");
memif = &cmd.memif();
cmd.respond(1);
}
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