From 360add0dacd89726346ee898881ed90841548e85 Mon Sep 17 00:00:00 2001
From: Emile <hanemile@protonmail.com>
Date: Sun, 5 May 2019 22:22:24 +0200
Subject: basic functionality

---
 main.go | 126 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 126 insertions(+)
 create mode 100644 main.go

diff --git a/main.go b/main.go
new file mode 100644
index 0000000..a5f5503
--- /dev/null
+++ b/main.go
@@ -0,0 +1,126 @@
+package main
+
+import (
+	"bytes"
+	"flag"
+	"fmt"
+	"log"
+	"net"
+	"time"
+)
+
+var (
+	host = flag.String("host", "127.0.0.1", "Server address (v4)")
+	port = flag.String("port", "1337", "Server port")
+	address string
+
+	imagePath = flag.String("image", "foo.png", "Relative image path")
+	imageOffsetX = flag.Int("xoffset", 0, "xoffset")
+	imageOffsetY = flag.Int("yoffset", 0, "yoffset")
+
+	canvasWidth = flag.Int("width", 1920, "canvas width")
+	canvasHeight = flag.Int("height", 1080, "canvas height")
+
+	testConn = flag.Bool("t", false, "test the connection before escalating completely")
+
+	fill = flag.Bool("fill", true, "fill the complete canvas")
+	color = flag.String("color", "000000", "define a color")
+
+	cores = flag.Int("cores", 1, "Amount of cores to use")
+)
+
+// parse the command line
+func parseFlags() {
+	flag.Parse()
+
+	address = fmt.Sprintf("%s:%s", *host, *port)
+}
+
+// test the connection to the given server if the -t flag was set
+func testConnection() {
+	if *testConn == true {
+		log.Printf("[ ] Testing Connection: True")
+
+		log.Println("[ ] Testing TCP Connection...")
+		testConnectionProtocol("tcp")
+
+	} else {
+		log.Printf("[ ] Testing Connection: False")
+	}
+}
+
+// test connecting to the server using the given protocol ("udp" or "tcp")
+func testConnectionProtocol(protocol string) {
+	connection, netDialErr := net.Dial(protocol, address)
+	if netDialErr != nil {
+		log.Fatal(netDialErr)
+	}
+	connectionCloseError := connection.Close()
+	if connectionCloseError != nil {
+		log.Fatal(connectionCloseError)
+	}
+}
+
+func buildSendString(start int, end int, doneChannel chan bool, stripBufferChannel chan bytes.Buffer) {
+	fmt.Printf("start: %d \t end: %d\n", start, end)
+
+	var stripBuffer bytes.Buffer
+	var currentCommand string
+
+	for x := start; x < end; x++ {
+		for y := 0; y < *canvasHeight; y++ {
+			// prepare the command that should be written
+			currentCommand = fmt.Sprintf("PX %d %d %s\n", x, y, *color)
+			stripBuffer.Write([]byte(currentCommand))
+		}
+	}
+
+	doneChannel <- true
+	stripBufferChannel <- stripBuffer
+}
+
+func main() {
+
+	log.Printf("[ ] %s -> %s:%s at (%d, %d)", *imagePath, *host, *port, imageOffsetX, imageOffsetY)
+	parseFlags()
+	testConnection()
+
+	doneChannel := make(chan bool)
+	stripBufferChannel := make(chan bytes.Buffer)
+	var completeBuffer bytes.Buffer
+
+	var stripwidth int = *canvasWidth / *cores
+	for thread := 0; thread < *cores; thread++ {
+		log.Printf("Starting thread %d", thread)
+		go buildSendString(thread * stripwidth, (thread + 1) * stripwidth, doneChannel, stripBufferChannel)
+	}
+
+	for thread := 0; thread < *cores; thread++ {
+		log.Printf("Thread %d done!", thread)
+		_ = <- doneChannel
+
+		stripBufferChannelOutput := <- stripBufferChannel
+		completeBuffer.Write(stripBufferChannelOutput.Bytes())
+	}
+
+	// write
+	connection, netDialError := net.Dial("tcp", address)
+	if netDialError != nil {
+		log.Fatal(netDialError)
+	}
+
+	_, writeErr := connection.Write(completeBuffer.Bytes())
+	if writeErr != nil {
+		log.Fatal(writeErr)
+	}
+
+	connectionCloseError := connection.Close()
+	if connectionCloseError != nil {
+		log.Fatal(connectionCloseError)
+	}
+
+	// cleanup
+	fmt.Printf("cleanup: %d -> %d", *cores * stripwidth, *canvasWidth)
+
+	time.Sleep(1 * time.Second)
+}
\ No newline at end of file
-- 
cgit 1.4.1