From 1a95e48389e16a34b95ed269c1d1dcbc0ca0c839 Mon Sep 17 00:00:00 2001
From: Alexander Neumann <alexander@bumpern.de>
Date: Sun, 24 Jan 2016 18:58:15 +0100
Subject: [PATCH] Remove unneeded special readers

---
 backend/reader.go      | 73 -------------------------------------
 backend/reader_test.go | 81 ------------------------------------------
 2 files changed, 154 deletions(-)
 delete mode 100644 backend/reader.go
 delete mode 100644 backend/reader_test.go

diff --git a/backend/reader.go b/backend/reader.go
deleted file mode 100644
index eabe9527b..000000000
--- a/backend/reader.go
+++ /dev/null
@@ -1,73 +0,0 @@
-package backend
-
-import (
-	"hash"
-	"io"
-)
-
-type HashAppendReader struct {
-	r      io.Reader
-	h      hash.Hash
-	sum    []byte
-	closed bool
-}
-
-func NewHashAppendReader(r io.Reader, h hash.Hash) *HashAppendReader {
-	return &HashAppendReader{
-		h:   h,
-		r:   io.TeeReader(r, h),
-		sum: make([]byte, 0, h.Size()),
-	}
-}
-
-func (h *HashAppendReader) Read(p []byte) (n int, err error) {
-	if !h.closed {
-		n, err = h.r.Read(p)
-
-		if err == io.EOF {
-			h.closed = true
-			h.sum = h.h.Sum(h.sum)
-		} else if err != nil {
-			return
-		}
-	}
-
-	if h.closed {
-		// output hash
-		r := len(p) - n
-
-		if r > 0 {
-			c := copy(p[n:], h.sum)
-			h.sum = h.sum[c:]
-
-			n += c
-			err = nil
-		}
-
-		if len(h.sum) == 0 {
-			err = io.EOF
-		}
-	}
-
-	return
-}
-
-type HashingReader struct {
-	r io.Reader
-	h hash.Hash
-}
-
-func NewHashingReader(r io.Reader, h hash.Hash) *HashingReader {
-	return &HashingReader{
-		h: h,
-		r: io.TeeReader(r, h),
-	}
-}
-
-func (h *HashingReader) Read(p []byte) (int, error) {
-	return h.r.Read(p)
-}
-
-func (h *HashingReader) Sum(d []byte) []byte {
-	return h.h.Sum(d)
-}
diff --git a/backend/reader_test.go b/backend/reader_test.go
deleted file mode 100644
index b4a23eaea..000000000
--- a/backend/reader_test.go
+++ /dev/null
@@ -1,81 +0,0 @@
-package backend_test
-
-import (
-	"bytes"
-	"crypto/rand"
-	"crypto/sha256"
-	"io"
-	"io/ioutil"
-	"testing"
-
-	"github.com/restic/restic/backend"
-	. "github.com/restic/restic/test"
-)
-
-func TestHashAppendReader(t *testing.T) {
-	tests := []int{5, 23, 2<<18 + 23, 1 << 20}
-
-	for _, size := range tests {
-		data := make([]byte, size)
-		_, err := io.ReadFull(rand.Reader, data)
-		if err != nil {
-			t.Fatalf("ReadFull: %v", err)
-		}
-
-		expectedHash := sha256.Sum256(data)
-
-		rd := backend.NewHashAppendReader(bytes.NewReader(data), sha256.New())
-
-		target := bytes.NewBuffer(nil)
-		n, err := io.Copy(target, rd)
-		OK(t, err)
-
-		Assert(t, n == int64(size)+int64(len(expectedHash)),
-			"HashAppendReader: invalid number of bytes read: got %d, expected %d",
-			n, size+len(expectedHash))
-
-		r := target.Bytes()
-		resultingHash := r[len(r)-len(expectedHash):]
-		Assert(t, bytes.Equal(expectedHash[:], resultingHash),
-			"HashAppendReader: hashes do not match: expected %02x, got %02x",
-			expectedHash, resultingHash)
-
-		// try to read again, must return io.EOF
-		n2, err := rd.Read(make([]byte, 100))
-		Assert(t, n2 == 0, "HashAppendReader returned %d additional bytes", n)
-		Assert(t, err == io.EOF, "HashAppendReader returned %v instead of EOF", err)
-	}
-}
-
-func TestHashingReader(t *testing.T) {
-	tests := []int{5, 23, 2<<18 + 23, 1 << 20}
-
-	for _, size := range tests {
-		data := make([]byte, size)
-		_, err := io.ReadFull(rand.Reader, data)
-		if err != nil {
-			t.Fatalf("ReadFull: %v", err)
-		}
-
-		expectedHash := sha256.Sum256(data)
-
-		rd := backend.NewHashingReader(bytes.NewReader(data), sha256.New())
-
-		n, err := io.Copy(ioutil.Discard, rd)
-		OK(t, err)
-
-		Assert(t, n == int64(size),
-			"HashAppendReader: invalid number of bytes read: got %d, expected %d",
-			n, size)
-
-		resultingHash := rd.Sum(nil)
-		Assert(t, bytes.Equal(expectedHash[:], resultingHash),
-			"HashAppendReader: hashes do not match: expected %02x, got %02x",
-			expectedHash, resultingHash)
-
-		// try to read again, must return io.EOF
-		n2, err := rd.Read(make([]byte, 100))
-		Assert(t, n2 == 0, "HashAppendReader returned %d additional bytes", n)
-		Assert(t, err == io.EOF, "HashAppendReader returned %v instead of EOF", err)
-	}
-}