增加Lua函数

sgutil/lua/extrace_npk_file.lua

@@ -0,0 +1,48 @@
+--Extracts all files from an NPK archive to a specified output directory.
+--[[
+npkFileName  The path to the NPK archive file to be extracted.
+outputPath    The path to the output directory where files will be extracted.
+return true if extraction succeeds; false otherwise.
+--]]
+local M={}
+function  M.extract_npk_files(npkFileName, outputPath)
+	local npk = createNPKFile();
+	
+	local ret = npk:openPakFile(npkFileName)
+	if(not ret) then
+		return false
+	end
+
+	local counts = npk:getFileCounts()
+	for i=0, counts-1, 1 do
+		local baseInfo = npk:getFileNode(i)
+		
+		local fileStream = npk:openFileStream(baseInfo:keyName())
+		
+		print("keyName=" .. fileStream:name() .. "\n")
+		
+		local diskFileName = outputPath .. "/" .. baseInfo:keyName()
+		ret = forceCreatePathForFile(diskFileName);
+		if(not ret) then
+			print("CreatePathForFile failed: " .. diskFileName)
+			npk:closeFileStream(fileStream)
+			break
+		end
+		
+		ret = fileStream:writeToDiskFile(diskFileName)
+		if(not ret) then
+			print("dump file failed: " .. baseInfo:keyName())
+			print("LastErrorMsg=" .. getLastErrorMessage())
+			npk:closeFileStream(fileStream)
+			break
+		end	
+		npk:closeFileStream(fileStream)
+	end
+	
+	npk:closePakFile()
+	destroyNPKFile(npk)
+	return true
+end
+
+
+return M;