aux platform

extract/aos.go

@@ -0,0 +1,82 @@
+package extract
+
+import (
+	"bufio"
+	"fmt"
+	"os"
+	"path/filepath"
+
+	log "github.com/sirupsen/logrus"
+)
+
+const (
+	AOSFrameLength    = 1024
+	AOSTempDataPrefix = "AOS_"
+)
+
+var AOSSyncWord = []byte{0x1A, 0xCF, 0xFC, 0x1D}
+
+type AOSFrame struct {
+}
+
+func (p *Extractor) ExtractAosData() error {
+	// 打开传输帧文件 - 一次读入内存
+	rawData, err := os.ReadFile(p.params.InputData)
+	if err != nil {
+		log.Println("read data from", p.params.InputData, "error:", err.Error())
+		return err
+	}
+
+	name := filepath.Base(p.params.InputData)
+	aosDataFile := filepath.Join(p.params.TempPath, AOSTempDataPrefix+name)
+	foData, err := os.OpenFile(aosDataFile,
+		os.O_CREATE|os.O_TRUNC|os.O_WRONLY, 0777)
+	if err != nil {
+		fmt.Println("create data err", err.Error())
+		return err
+	}
+	defer foData.Close()
+	wData := bufio.NewWriter(foData)
+
+	var validFrameCnt int
+	var errFrameCnt int
+
+	for i := 0; i < len(rawData); {
+		// 寻找帧头 0x1A CF FC 1D
+		if i+4 > len(rawData) {
+			log.Info("end of raw data")
+			break
+		}
+
+		if rawData[i] == 0x1A && rawData[i+1] == 0xCF && rawData[i+2] == 0xFC && rawData[i+3] == 0x1D {
+			// 找到帧头
+			log.Debug("detect AOS frame")
+		} else {
+			i++
+			continue
+		}
+
+		if i+1024 > len(rawData) {
+			log.Info("not enough data for AOS frame")
+			break
+		}
+
+		// 读取完整帧
+		if ldpcCheck(rawData[i:i+1024]) != nil {
+			errFrameCnt++
+		}
+
+		wData.Write(rawData[i+10 : i+894])
+		i += 1024
+		validFrameCnt++
+	}
+
+	log.Println("valid AOS frame cnt:", validFrameCnt)
+	log.Println("err AOS frame cnt:", errFrameCnt)
+
+	return nil
+}
+
+func ldpcCheck(frame []byte) error {
+	return nil
+}