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package librsync
import (
"io"
)
// Some helper functions to make things more convenient.
// CreateSignature wraps around a signature generation job and copies the result to the signature writer.
func CreateSignature(basis io.Reader, signature io.Writer) error {
siggen, err := NewDefaultSignatureGen(basis)
if err != nil {
return err
}
defer siggen.Close()
_, err = io.Copy(signature, siggen)
return err
}
// CreateDelta wraps around a delta generation job and copies the result to the delta writer.
func CreateDelta(signature, newfile io.Reader, delta io.Writer) error {
sig, err := LoadSignature(signature)
if err != nil {
return err
}
defer sig.Close()
deltagen, err := NewDeltaGen(sig, newfile)
if err != nil {
return err
}
defer deltagen.Close()
_, err = io.Copy(delta, deltagen)
return err
}
// InstantDelta creates a delta file without the extra step of creating a signature.
func InstantDelta(basis, newfile io.Reader, delta io.Writer) error {
siggen, err := NewDefaultSignatureGen(basis)
if err != nil {
return err
}
defer siggen.Close()
sig, err := LoadSignature(siggen)
if err != nil {
return err
}
defer sig.Close()
deltagen, err := NewDeltaGen(sig, newfile)
if err != nil {
return err
}
defer deltagen.Close()
_, err = io.Copy(delta, deltagen)
return err
}
// Patch wraps around a Patcher job and copies the result to newfile.
func Patch(basis io.ReaderAt, delta io.Reader, newfile io.Writer) error {
patcher, err := NewPatcher(delta, basis)
if err != nil {
return err
}
defer patcher.Close()
_, err = io.Copy(newfile, patcher)
return err
}
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