From a07bbe4ef22d642347d18f0e0a62d24868500d23 Mon Sep 17 00:00:00 2001
From: n-peugnet <n.peugnet@free.fr>
Date: Thu, 23 Sep 2021 18:10:30 +0200
Subject: Testing with Fdelta as the differ

---
 delta.go | 43 +++++++++++++++++++++++++++++++++++--------
 1 file changed, 35 insertions(+), 8 deletions(-)

(limited to 'delta.go')

diff --git a/delta.go b/delta.go
index ff42e86..a127580 100644
--- a/delta.go
+++ b/delta.go
@@ -5,13 +5,9 @@ import (
 
 	"github.com/gabstv/go-bsdiff/pkg/bsdiff"
 	"github.com/gabstv/go-bsdiff/pkg/bspatch"
+	"github.com/mdvan/fdelta"
 )
 
-type DeltaCodec interface {
-	Differ
-	Patcher
-}
-
 type Differ interface {
 	Diff(source io.Reader, target io.Reader, patch io.Writer) error
 }
@@ -20,13 +16,44 @@ type Patcher interface {
 	Patch(source io.Reader, target io.Writer, patch io.Reader) error
 }
 
-// TODO: maybe move this in its own file ?
 type Bsdiff struct{}
 
-func (*Bsdiff) Diff(source io.Reader, target io.Reader, patch io.Writer) error {
+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 {
+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
+}
-- 
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