update book code

eBook/examples/chapter_12/gzipped.go

@@ -0,0 +1,35 @@
+// gzipped.go
+package main
+
+import (
+	"fmt"
+	"bufio"
+	"os"
+	"compress/gzip"
+)
+
+func main() {
+	fName := "MyFile.gz"
+	var r *bufio.Reader
+	fi, err := os.Open(fName)
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "%v, Can't open %s: error: %s\n", os.Args[0], fName,
+			err)
+		os.Exit(1)
+	}
+	fz, err := gzip.NewReader(fi)
+	if err != nil {
+		r = bufio.NewReader(fi)
+	} else {
+		r = bufio.NewReader(fz)
+	}
+
+	for {
+		line, err := r.ReadString('\n')
+		if err != nil {
+			fmt.Println("Done reading file")
+			os.Exit(0)
+		}
+		fmt.Println(line)
+	}
+}