1 files changed, 59 insertions, 0 deletions
diff --git a/delta/delta.go b/delta/delta.go
new file mode 100644
index 0000000..439da1d
--- /dev/null
+++ b/delta/delta.go
@@ -0,0 +1,59 @@
+package delta
+
+import (
+	"io"
+
+	"github.com/gabstv/go-bsdiff/pkg/bsdiff"
+	"github.com/gabstv/go-bsdiff/pkg/bspatch"
+	"github.com/mdvan/fdelta"
+)
+
+type Differ interface {
+	Diff(source io.Reader, target io.Reader, patch io.Writer) error
+}
+
+type Patcher interface {
+	Patch(source io.Reader, target io.Writer, patch io.Reader) error
+}
+
+type Bsdiff struct{}
+
+func (Bsdiff) Diff(source io.Reader, target io.Reader, patch io.Writer) error {
+	return bsdiff.Reader(source, target, patch)
+}
+
+func (Bsdiff) Patch(source io.Reader, target io.Writer, patch io.Reader) error {
+	return bspatch.Reader(source, target, patch)
+}
+
+type Fdelta struct{}
+
+func (Fdelta) Diff(source io.Reader, target io.Reader, patch io.Writer) error {
+	sourceBuf, err := io.ReadAll(source)
+	if err != nil {
+		return err
+	}
+	targetBuf, err := io.ReadAll(target)
+	if err != nil {
+		return err
+	}
+	_, err = patch.Write(fdelta.Create(sourceBuf, targetBuf))
+	return err
+}
+
+func (Fdelta) Patch(source io.Reader, target io.Writer, patch io.Reader) error {
+	sourceBuf, err := io.ReadAll(source)
+	if err != nil {
+		return err
+	}
+	patchBuf, err := io.ReadAll(patch)
+	if err != nil {
+		return err
+	}
+	targetBuf, err := fdelta.Apply(sourceBuf, patchBuf)
+	if err != nil {
+		return err
+	}
+	_, err = target.Write(targetBuf)
+	return err
+}