refactor

do not expose internal offset

weed/filesys/page_writer/page_chunk_mem.go

@@ -30,8 +30,9 @@ func (mc *MemChunk) FreeResource() {
 }
 
 func (mc *MemChunk) WriteDataAt(src []byte, offset int64) (n int) {
-	n = copy(mc.buf[offset:], src)
-	mc.usage.MarkWritten(offset, offset+int64(n))
+	innerOffset := offset % mc.chunkSize
+	n = copy(mc.buf[innerOffset:], src)
+	mc.usage.MarkWritten(innerOffset, innerOffset+int64(n))
 	return
 }
 

weed/filesys/page_writer/upload_pipeline.go

@@ -57,14 +57,13 @@ func (cw *UploadPipeline) SaveDataAt(p []byte, off int64) (n int) {
 	defer cw.writableChunksLock.Unlock()
 
 	logicChunkIndex := LogicChunkIndex(off / cw.ChunkSize)
-	offsetRemainder := off % cw.ChunkSize
 
 	memChunk, found := cw.writableChunks[logicChunkIndex]
 	if !found {
 		memChunk = NewMemChunk(logicChunkIndex, cw.ChunkSize)
 		cw.writableChunks[logicChunkIndex] = memChunk
 	}
-	n = memChunk.WriteDataAt(p, offsetRemainder)
+	n = memChunk.WriteDataAt(p, off)
 	cw.maybeMoveToSealed(memChunk, logicChunkIndex)
 
 	return