FileRecord improvement: create a command to rescue corrupted .sdriq files

rescuesdriq/rescuesdriq.go

@@ -0,0 +1,77 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+    "bufio"
+    "io"
+    "os"
+    "bytes"
+    "encoding/binary"
+    "time"
+)
+
+	
+type HeaderStd struct {
+    SampleRate      uint32
+    CenterFrequency uint64
+    StartTimestamp  int64
+    SampleSize      uint32
+    _               uint32
+    CRC32           uint32
+}
+
+func analyze(fileName string) HeaderStd {
+	fmt.Println("input file:", fileName)
+	
+    // open input file
+    fi, err := os.Open(fileName)
+    if err != nil {
+        panic(err)
+    }
+    // close fi on exit and check for its returned error
+    defer func() {
+        if err := fi.Close(); err != nil {
+            panic(err)
+        }
+    }()
+    // make a read buffer
+    r := bufio.NewReader(fi)
+    
+    headerbuf := make([]byte, 32) // This is a full header with CRC
+	n, err := r.Read(headerbuf)
+	if err != nil && err != io.EOF {
+		panic(err)
+	}
+	if (n != 32) {
+		panic("Header too small")
+	}
+		
+	var header HeaderStd
+	headerr := bytes.NewReader(headerbuf)
+	err = binary.Read(headerr, binary.LittleEndian, &header)
+    if err != nil {
+        panic(err)
+    }
+    
+    fmt.Println("Sample rate:", header.SampleRate)
+    fmt.Println("Frequency  :", header.CenterFrequency)
+    fmt.Println("Sample Size:", header.SampleSize)
+    tm := time.Unix(header.StartTimestamp, 0)
+    fmt.Println("Start      :", tm)
+    
+    return header
+}
+
+func main() {
+	wordPtr := flag.String("in", "foo", "input file")
+	flag.Parse()
+	flagSeen := make(map[string]bool)
+	flag.Visit(func(f *flag.Flag) { flagSeen[f.Name] = true })
+	
+	if flagSeen["in"] {
+		analyze(*wordPtr)
+	} else {
+		fmt.Println("No input file given")
+	}
+}