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main.go
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main.go
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package main
import (
"encoding/binary"
"flag"
"fmt"
"hash/crc32"
"io"
"net"
"time"
)
var (
port = flag.String("port", "", "Port to listen, e.g.: \":8080\"")
)
func saveFile(conn net.Conn) {
defer conn.Close()
buffer := make([]byte, 1024*1024)
nBytes, err := io.ReadAtLeast(conn, buffer, 4)
if err != nil {
fmt.Println("Failed to read header:", err)
return
}
filenameLen := binary.BigEndian.Uint32(buffer[:4])
copy(buffer, buffer[4:nBytes])
nBytes -= 4
if uint32(nBytes) < filenameLen {
_, err := io.ReadFull(conn, buffer[nBytes:filenameLen])
if err != nil {
fmt.Println("Failed to read header:", err)
}
}
filename := string(buffer[:filenameLen])
//f, err := os.Create(filename)
//if err != nil {
// fmt.Println("Failed to create file:", err)
// conn.Write([]byte{0x01})
// return
//}
//defer f.Close()
conn.Write([]byte{0x00})
startTime := time.Now()
fmt.Println("Transfering file:", filename)
crc := crc32.NewIEEE()
totalBytesReceived := 0
for {
nBytes, err := conn.Read(buffer)
if err == io.EOF {
break
}
if err != nil {
fmt.Println("Failed to read file content:", err)
return
}
totalBytesReceived += nBytes
crc.Write(buffer[:nBytes])
}
endTime := time.Now()
fmt.Println(filename, "received", totalBytesReceived, "bytes with crc:", crc.Sum32(), "in", endTime.Sub(startTime))
}
func main() {
flag.Parse()
listerner, err := net.Listen("tcp", *port)
if err != nil {
fmt.Println("Failed to listen on", *port, ":", err)
return
}
for {
conn, err := listerner.Accept()
if err != nil {
fmt.Println("Failed to accept connection:", err)
return
}
go saveFile(conn)
}
}