From cc756ddd79608ff46839a1542c3f42d4ab8148d7 Mon Sep 17 00:00:00 2001
From: "j.laycock" <joseph.laycock@4sightimaging.com>
Date: Wed, 4 Sep 2019 14:24:17 +0100
Subject: [PATCH] Rename End_of_file variable, implement platform indepenent
 memory_map.go

---
 weed/storage/memory_map/memory_map.go         | 25 ++++++++++++++++---
 weed/storage/memory_map/memory_map_windows.go |  8 +++---
 weed/storage/needle/needle_read_write.go      |  2 +-
 weed/storage/volume_super_block.go            |  2 +-
 4 files changed, 28 insertions(+), 9 deletions(-)

diff --git a/weed/storage/memory_map/memory_map.go b/weed/storage/memory_map/memory_map.go
index 1c1f8dd69..e8d3de6e0 100644
--- a/weed/storage/memory_map/memory_map.go
+++ b/weed/storage/memory_map/memory_map.go
@@ -2,7 +2,10 @@
 
 package memory_map
 
-import "os"
+import (
+	"fmt"
+	"os"
+)
 
 type MemoryBuffer struct {
 	aligned_length uint64
@@ -17,7 +20,23 @@ type MemoryMap struct {
 	file_memory_map_handle uintptr
 	write_map_views        []MemoryBuffer
 	max_length             uint64
-	End_Of_File            int64
+	End_of_file            int64
 }
 
-var FileMemoryMap = make(map[string]MemoryMap)
+var FileMemoryMap = make(map[string]*MemoryMap)
+
+func (mMap *MemoryMap) WriteMemory(offset uint64, length uint64, data []byte) {
+
+}
+
+func (mMap *MemoryMap) ReadMemory(offset uint64, length uint64) (MemoryBuffer, error) {
+	return MemoryBuffer{}, fmt.Errorf("Memory Map not implemented for this platform")
+}
+
+func (mem_buffer *MemoryBuffer) ReleaseMemory() {
+
+}
+
+func (mMap *MemoryMap) DeleteFileAndMemoryMap() {
+
+}
diff --git a/weed/storage/memory_map/memory_map_windows.go b/weed/storage/memory_map/memory_map_windows.go
index fe6f152b7..055aeacc5 100644
--- a/weed/storage/memory_map/memory_map_windows.go
+++ b/weed/storage/memory_map/memory_map_windows.go
@@ -24,7 +24,7 @@ type MemoryMap struct {
 	file_memory_map_handle uintptr
 	write_map_views        []MemoryBuffer
 	max_length             uint64
-	End_Of_File            int64
+	End_of_file            int64
 }
 
 var FileMemoryMap = make(map[string]*MemoryMap)
@@ -51,7 +51,7 @@ func (mMap *MemoryMap) CreateMemoryMap(file *os.File, maxlength uint64) {
 		mMap.file_memory_map_handle = uintptr(file_memory_map_handle)
 		mMap.write_map_views = make([]MemoryBuffer, 0, maxlength/chunk_size)
 		mMap.max_length = maxlength
-		mMap.End_Of_File = -1
+		mMap.End_of_file = -1
 	}
 }
 
@@ -103,8 +103,8 @@ func (mMap *MemoryMap) WriteMemory(offset uint64, length uint64, data []byte) {
 		}
 	}
 
-	if mMap.End_Of_File < int64(offset+length-1) {
-		mMap.End_Of_File = int64(offset + length - 1)
+	if mMap.End_of_file < int64(offset+length-1) {
+		mMap.End_of_file = int64(offset + length - 1)
 	}
 }
 
diff --git a/weed/storage/needle/needle_read_write.go b/weed/storage/needle/needle_read_write.go
index c29e17079..23a192543 100644
--- a/weed/storage/needle/needle_read_write.go
+++ b/weed/storage/needle/needle_read_write.go
@@ -145,7 +145,7 @@ func (n *Needle) Append(w *os.File, version Version) (offset uint64, size uint32
 			return
 		}
 	} else {
-		offset = uint64(mMap.End_Of_File + 1)
+		offset = uint64(mMap.End_of_file + 1)
 	}
 
 	bytesToWrite, size, actualSize, err := n.prepareWriteBuffer(version)
diff --git a/weed/storage/volume_super_block.go b/weed/storage/volume_super_block.go
index 936648f44..f93c43fbf 100644
--- a/weed/storage/volume_super_block.go
+++ b/weed/storage/volume_super_block.go
@@ -75,7 +75,7 @@ func (v *Volume) maybeWriteSuperBlock() error {
 
 	mMap, exists := memory_map.FileMemoryMap[v.dataFile.Name()]
 	if exists {
-		if mMap.End_Of_File == -1 {
+		if mMap.End_of_file == -1 {
 			v.SuperBlock.version = needle.CurrentVersion
 			mMap.WriteMemory(0, uint64(len(v.SuperBlock.Bytes())), v.SuperBlock.Bytes())
 		}