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package delta
import (
"fmt"
"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 fmt.Errorf("source read all: %s", err)
}
patchBuf, err := io.ReadAll(patch)
if err != nil {
return fmt.Errorf("patch read all: %s", err)
}
targetBuf, err := fdelta.Apply(sourceBuf, patchBuf)
if err != nil {
return fmt.Errorf("apply patch: %s", err)
}
_, err = target.Write(targetBuf)
return err
}
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