Add contrib/findholes

Utility and libs to find hole/data segments using lseek.

1 files changed, 34 insertions, 0 deletions

diff --git a/contrib/findholes/main.go b/contrib/findholes/main.go
new file mode 100644
index 0000000..6f1ae64
--- /dev/null
+++ b/contrib/findholes/main.go
@@ -0,0 +1,34 @@
+// Find and pretty-print holes & data sections of a file.
+package main
+
+import (
+	"flag"
+	"fmt"
+	"os"
+
+	"github.com/rfjakob/gocryptfs/contrib/findholes/holes"
+)
+
+func main() {
+	flag.Parse()
+	if flag.NArg() != 1 {
+		fmt.Printf("Usage: findholes FILE\n")
+		os.Exit(1)
+	}
+
+	f, err := os.Open(flag.Arg(0))
+	if err != nil {
+		// os.Open() gives nicer error messages than syscall.Open()
+		fmt.Println(err)
+		os.Exit(1)
+	}
+	defer f.Close()
+
+	segments, err := holes.Find(int(f.Fd()))
+	if err != nil {
+		fmt.Println(err)
+		os.Exit(1)
+	}
+
+	fmt.Println(holes.PrettyPrint(segments))
+}