src/lib.go: Add CopyData()

1 files changed, 20 insertions, 0 deletions

diff --git a/src/lib.go b/src/lib.go
index 391e629..4ce13ff 100644
--- a/src/lib.go
+++ b/src/lib.go
@@ -44,6 +44,12 @@ type Gauge struct {
 	Dec func(...any)
 }
 
+type CopyResult struct {
+	Written int64
+	Err     error
+	Label   string
+}
+
 
 
 const MaxInt = int((^uint(0)) >> 1)
@@ -364,6 +370,20 @@ func Scrypt(
 	return PBKDF2Key(password, b, 1, keyLen, sha256.New), nil
 }
 
+func CopyData(
+	c chan CopyResult,
+	label string,
+	from io.Reader,
+	to io.WriteCloser,
+) {
+	written, err := io.Copy(to, from)
+	c <- CopyResult {
+		Written: written,
+		Err:     err,
+		Label:   label,
+	}
+}
+
 // FIXME: finish rewriting
 //
 // getV7Time returns the time in milliseconds and nanoseconds / 256.