start on internal helpers

1 files changed, 30 insertions, 0 deletions

diff --git a/internal/util/io.go b/internal/util/io.go
new file mode 100644
index 0000000..143a520
--- /dev/null
+++ b/internal/util/io.go
@@ -0,0 +1,30 @@
+package util
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"os"
+
+	"git.sigsum.org/sigsum-go/pkg/hex"
+)
+
+func BytesFromStdin() ([]byte, error) {
+	b, err := ioutil.ReadAll(os.Stdin)
+	if err != nil {
+		return nil, fmt.Errorf("util: read stdin: %v", err)
+	}
+	return b, nil
+}
+
+func HexFromStdin() ([]byte, error) {
+	b, err := BytesFromStdin()
+	if err != nil {
+		return nil, err
+	}
+	b, err = hex.Deserialize(string(bytes.TrimSpace(b)))
+	if err != nil {
+		return nil, fmt.Errorf("util: parse stdin: %v", err)
+	}
+	return b, nil
+}