Initial commit

Test/testreadlast.py

@@ -0,0 +1,42 @@
+import os
+
+def ReadFileRangeFromEnd(FilePath, StartLineFromEnd, EndLineFromEnd, BufferSize=1024 * 10, ReturnType=str):
+    if StartLineFromEnd < 1 or EndLineFromEnd < 1:
+        raise ValueError("Line number must be greater than 0")
+    if StartLineFromEnd > EndLineFromEnd:
+        raise ValueError("StartLineFromEnd must be less than or equal to EndLineFromEnd")
+    LineCount = EndLineFromEnd
+    BufferSize = BufferSize * LineCount
+    with open(FilePath, 'rb') as FileObj:
+        FileObj.seek(0, 2)
+        FileSize = FileObj.tell()
+        BufferSize = min(BufferSize, FileSize)
+        Lines = []
+        CurrentPosition = FileSize
+        FoundLines = 0
+        while CurrentPosition > 0 and FoundLines < LineCount:
+            ReadPosition = max(0, CurrentPosition - BufferSize)
+            ChunkSize = CurrentPosition - ReadPosition
+            FileObj.seek(ReadPosition)
+            Chunk = FileObj.read(ChunkSize)
+            ChunkLines = Chunk.splitlines()
+            ChunkLines = ChunkLines[::-1]
+            for Line in ChunkLines:
+                if FoundLines < LineCount:
+                    Lines.append(Line)
+                    FoundLines += 1
+                else:
+                    break
+            CurrentPosition = ReadPosition
+        Lines = Lines[::-1]
+        StartIndex = max(0, len(Lines) - EndLineFromEnd)
+        EndIndex = len(Lines) - StartLineFromEnd + 1
+        ResultLines = Lines[StartIndex:EndIndex]
+        R = [Line.decode('utf-8', errors='ignore') for Line in ResultLines]
+        if ReturnType == str: return '\n'.join(R)
+        elif ReturnType == list: return R
+        else: raise ValueError("Return Type Error")
+TempDir = os.getenv("temp")
+LogFile = os.path.join(TempDir, "T.log")
+
+ResultLines = ReadFileRangeFromEnd(LogFile, 1, 300)