From 14db71d3fa43194c7d14ad7c199704fe296aacef Mon Sep 17 00:00:00 2001
From: Alexander Neumann <alexander@bumpern.de>
Date: Sun, 31 Jul 2016 10:29:53 +0200
Subject: [PATCH] Move RandReader to repository package

---
 src/restic/repository/rand_reader.go | 79 ++++++++++++++++++++++++++++
 src/restic/testing.go                | 73 +------------------------
 2 files changed, 80 insertions(+), 72 deletions(-)
 create mode 100644 src/restic/repository/rand_reader.go

diff --git a/src/restic/repository/rand_reader.go b/src/restic/repository/rand_reader.go
new file mode 100644
index 000000000..201826a94
--- /dev/null
+++ b/src/restic/repository/rand_reader.go
@@ -0,0 +1,79 @@
+package repository
+
+import (
+	"io"
+	"math/rand"
+)
+
+// RandReader allows reading from a rand.Rand.
+type RandReader struct {
+	rnd *rand.Rand
+	buf []byte
+}
+
+// NewRandReader creates a new Reader from a random source.
+func NewRandReader(rnd *rand.Rand) io.Reader {
+	return &RandReader{rnd: rnd, buf: make([]byte, 0, 7)}
+}
+
+func (rd *RandReader) read(p []byte) (n int, err error) {
+	if len(p)%7 != 0 {
+		panic("invalid buffer length, not multiple of 7")
+	}
+
+	rnd := rd.rnd
+	for i := 0; i < len(p); i += 7 {
+		val := rnd.Int63()
+
+		p[i+0] = byte(val >> 0)
+		p[i+1] = byte(val >> 8)
+		p[i+2] = byte(val >> 16)
+		p[i+3] = byte(val >> 24)
+		p[i+4] = byte(val >> 32)
+		p[i+5] = byte(val >> 40)
+		p[i+6] = byte(val >> 48)
+	}
+
+	return len(p), nil
+}
+
+func (rd *RandReader) Read(p []byte) (int, error) {
+	// first, copy buffer to p
+	pos := copy(p, rd.buf)
+	copy(rd.buf, rd.buf[pos:])
+
+	// shorten buf and p accordingly
+	rd.buf = rd.buf[:len(rd.buf)-pos]
+	p = p[pos:]
+
+	// if this is enough to fill p, return
+	if len(p) == 0 {
+		return pos, nil
+	}
+
+	// load multiple of 7 byte
+	l := (len(p) / 7) * 7
+	n, err := rd.read(p[:l])
+	pos += n
+	if err != nil {
+		return pos, err
+	}
+	p = p[n:]
+
+	// load 7 byte to temp buffer
+	rd.buf = rd.buf[:7]
+	n, err = rd.read(rd.buf)
+	if err != nil {
+		return pos, err
+	}
+
+	// copy the remaining bytes from the buffer to p
+	n = copy(p, rd.buf)
+	pos += n
+
+	// save the remaining bytes in rd.buf
+	n = copy(rd.buf, rd.buf[n:])
+	rd.buf = rd.buf[:n]
+
+	return pos, nil
+}
diff --git a/src/restic/testing.go b/src/restic/testing.go
index fa2ab649d..c0f1a0f72 100644
--- a/src/restic/testing.go
+++ b/src/restic/testing.go
@@ -13,80 +13,9 @@ import (
 	"github.com/restic/chunker"
 )
 
-type randReader struct {
-	rnd *rand.Rand
-	buf []byte
-}
-
-func newRandReader(rnd *rand.Rand) io.Reader {
-	return &randReader{rnd: rnd, buf: make([]byte, 0, 7)}
-}
-
-func (rd *randReader) read(p []byte) (n int, err error) {
-	if len(p)%7 != 0 {
-		panic("invalid buffer length, not multiple of 7")
-	}
-
-	rnd := rd.rnd
-	for i := 0; i < len(p); i += 7 {
-		val := rnd.Int63()
-
-		p[i+0] = byte(val >> 0)
-		p[i+1] = byte(val >> 8)
-		p[i+2] = byte(val >> 16)
-		p[i+3] = byte(val >> 24)
-		p[i+4] = byte(val >> 32)
-		p[i+5] = byte(val >> 40)
-		p[i+6] = byte(val >> 48)
-	}
-
-	return len(p), nil
-}
-
-func (rd *randReader) Read(p []byte) (int, error) {
-	// first, copy buffer to p
-	pos := copy(p, rd.buf)
-	copy(rd.buf, rd.buf[pos:])
-
-	// shorten buf and p accordingly
-	rd.buf = rd.buf[:len(rd.buf)-pos]
-	p = p[pos:]
-
-	// if this is enough to fill p, return
-	if len(p) == 0 {
-		return pos, nil
-	}
-
-	// load multiple of 7 byte
-	l := (len(p) / 7) * 7
-	n, err := rd.read(p[:l])
-	pos += n
-	if err != nil {
-		return pos, err
-	}
-	p = p[n:]
-
-	// load 7 byte to temp buffer
-	rd.buf = rd.buf[:7]
-	n, err = rd.read(rd.buf)
-	if err != nil {
-		return pos, err
-	}
-
-	// copy the remaining bytes from the buffer to p
-	n = copy(p, rd.buf)
-	pos += n
-
-	// save the remaining bytes in rd.buf
-	n = copy(rd.buf, rd.buf[n:])
-	rd.buf = rd.buf[:n]
-
-	return pos, nil
-}
-
 // fakeFile returns a reader which yields deterministic pseudo-random data.
 func fakeFile(t testing.TB, seed, size int64) io.Reader {
-	return io.LimitReader(newRandReader(rand.New(rand.NewSource(seed))), size)
+	return io.LimitReader(repository.NewRandReader(rand.New(rand.NewSource(seed))), size)
 }
 
 // saveFile reads from rd and saves the blobs in the repository. The list of