clean up
diff --git a/archive/pfs/chunk/in_memory.go b/archive/pfs/chunk/in_memory.go
new file mode 100644
index 0000000..b9b55ec
--- /dev/null
+++ b/archive/pfs/chunk/in_memory.go
@@ -0,0 +1,68 @@
+package chunk
+
+import (
+ "bytes"
+ "errors"
+ "io"
+
+ "github.com/giolekva/pcloud/pfs/api"
+)
+
+type InMemoryChunk struct {
+ status api.ChunkStatus
+ payload []byte
+ committed int
+}
+
+func (c *InMemoryChunk) Stats() (ChunkInfo, error) {
+ return ChunkInfo{c.status, len(c.payload), c.committed}, nil
+}
+
+func (c *InMemoryChunk) ReaderAt() io.ReaderAt {
+ return bytes.NewReader(c.payload[:c.committed])
+}
+
+func (c *InMemoryChunk) WriterAt() io.WriterAt {
+ return &byteWriter{c}
+}
+
+type byteWriter struct {
+ c *InMemoryChunk
+}
+
+func (w *byteWriter) WriteAt(p []byte, offset int64) (n int, err error) {
+ if int(offset) > w.c.committed {
+ panic(1)
+ return 0, errors.New("Gaps are not allowed when writing in chunks")
+ }
+ if int(offset) < w.c.committed {
+ if int(offset)+len(p) <= w.c.committed {
+ if bytes.Compare(w.c.payload[int(offset):int(offset)+len(p)], p) != 0 {
+ panic(2)
+ return 0, errors.New("Can not change contents of allready committed chunk bytes")
+ }
+ panic(3)
+ return len(p), nil
+ }
+ n = w.c.committed - int(offset)
+ p = p[n:]
+ offset = int64(w.c.committed)
+ }
+ if w.c.committed+len(p) > len(w.c.payload) {
+ panic(4)
+ return 0, errors.New("In memory chunk does not have enough space available")
+ }
+ n += copy(w.c.payload[w.c.committed:], p)
+ w.c.committed += n
+ return
+}
+
+type InMemoryChunkFactory struct {
+}
+
+func (f InMemoryChunkFactory) New(size int) Chunk {
+ return &InMemoryChunk{
+ status: api.ChunkStatus_CREATED,
+ payload: make([]byte, size),
+ committed: 0}
+}