diff --git a/ZipDefine.h b/ZipDefine.h
index 58e0a00..d98814e 100644
--- a/ZipDefine.h
+++ b/ZipDefine.h
@@ -123,7 +123,7 @@ constexpr int LOCAL_FILE_HEADER_BYTE = 30;
       uint16_t diskNumStart;
       uint16_t attributeInternal;
       uint32_t attributeExternal;
-      uint32_t offsetLocalHeader;
+      uint32_t offsetLocalFileHeader;
 
       // var[lengthOfFileName] fileName
       // var[lengthOfExtraField] extraField
@@ -158,7 +158,6 @@ constexpr int LOCAL_FILE_HEADER_BYTE = 30;
       .ZIP file comment       (variable size)
 */
  constexpr int EOCD_BYTE = 22;
-
  struct EoCDRecord {
       uint32_t signature;
       
@@ -173,9 +172,9 @@ constexpr int LOCAL_FILE_HEADER_BYTE = 30;
 
       // .ZIP 파일 내 전체 파일 수
       uint16_t numOfEntries;
-      uint32_t SizeOfCentralDir;
-      uint32_t OffsetOfCentralDirOffset;
-      uint16_t LengthOfCommentLength;
+      uint32_t sizeOfCentralDir;
+      uint32_t offsetCentralDir;
+      uint16_t lengthOfCommentLength;
 
       // var[LengthOfCommentLength] zipFileComment
 };
diff --git a/main.cpp b/main.cpp
index adfae4c..f6f9f70 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,14 +1,16 @@
 #include <cstdio>
 #include <iostream>
+#include <cstring>
 #include <fstream>
 
 #include "ZipDefine.h"
 #include "CRC.h"
 
-#define TARGET_FILE_NAME "MyZip.txt"
+#define INPUT_FILE_NAME "MyZip.txt"
+#define OUTPUT_FILE_NAME "MyZip.zip"
 
 bool ZipArchiver();
-uint32_t getCRC32(const uint8_t* pData, size_t length);
+uint32_t getCRC32(const char* pData, size_t length);
 
 int main()
 {
@@ -55,11 +57,11 @@ bool ZipArchiver()
 
 	using namespace std;
 
-	ifstream fileIn(TARGET_FILE_NAME, ios::binary);
+	ifstream fileIn(INPUT_FILE_NAME, ios::binary);
 	bool iRet = fileIn.is_open();
 	if (!iRet)
 	{
-		printf("File open failed");
+		printf("FileIn open failed");
 	}
 	else
 	{
@@ -72,15 +74,15 @@ bool ZipArchiver()
 
 		// TODO : Buffering 으로 구현. 현재는 파일 통짜로 읽음.
 		// 메모리 할당
-		uint8_t* pFile = (uint8_t *)malloc(fileInSize);
+		auto pFile = (char *)malloc(fileInSize);
 
 		// Read
-		fileIn.read((char *)pFile, fileInSize);
-
+		fileIn.read(pFile, fileInSize);
 		// ZIP 포맷 채워넣기
+		// TODO : 여기있을 필요까진 없는듯. 코드 이관 필요
 		{
 			// Get CRC value
-			// TODO : streamsize 와 size_t 의 mismatch (long long <-> unsigned long long)
+			// TODO : 현재 streamsize 와 size_t 의 mismatch 존재. 해결필요.(long long <-> unsigned long long)
 			uint32_t myCRC = getCRC32(pFile, fileInSize);
 
 			// Put PK Signature
@@ -88,15 +90,18 @@ bool ZipArchiver()
 			CentDir.signature = PK_SIGNATURE_CENT_DIR;
 			EOCDR.signature = PK_SIGNATURE_EO_CDR;
 			
-			// TOOD : versionMadeBy (Only CentDir)
-			// TODO : versionNeededToExtract
-			// TODO : generalBitFlag
+			// TOOD : Temp Format 채우기.
+			CentDir.versionMadeBy = 0; // Temp
+			LFHeader.versionNeededToExtract = 0; // Temp
+			CentDir.versionNeededToExtract = 0; // Temp
+			LFHeader.generalBitFlag = 0; // Temp
+			CentDir.generalBitFlag = 0; // Temp
 
 			// Put compressed method (uncompressed)
 			LFHeader.compressionMethod = METHOD_UNCOMPRESSED;
 			CentDir.compressionMethod = METHOD_UNCOMPRESSED;
 			
-			// TODO : lastMode[Time|Date]
+			// lastMode[Time|Date] => Not Used.
 
 			// Put CRC value
 			LFHeader.crc32 = myCRC;
@@ -109,7 +114,7 @@ bool ZipArchiver()
 			CentDir.sizeOfCompressed = CentDir.sizeOfUncompressed;
 
 			// Put File name length
-			uint16_t fileNameLeng = strlen(TARGET_FILE_NAME);
+			uint16_t fileNameLeng = strlen(INPUT_FILE_NAME);
 			LFHeader.lengthOfFileName = fileNameLeng;
 			CentDir.lengthOfFileName = fileNameLeng;
 
@@ -117,21 +122,52 @@ bool ZipArchiver()
 			// LFHeader.lengthOfExtraField = NOT_USED;
 			// CentDir.lengthOfExtraField = NOT_USED;
 
-			// TODO : CentDir 나머지 format
-			//			- lengthOfFileComment
-			//			- diskNumStart;
-			//			- attributeInternal;
-			//			- attributeExternal;
-			//			- offsetLocalHeader;
+			// TODO : CentDir Temp format 채우기.
+			CentDir.lengthOfFileComment = 0;
+			CentDir.diskNumStart = 0; // Temp
+			CentDir.attributeInternal = 0; // Temp
+			CentDir.attributeExternal = 0; // Temp
+			// CentDir.offsetLocalFileHeader -> 실제 파일 Write 중에 작성.
 
-			// TODO : EOCDR 나머지 format
-			//			- diskNumber
-			//			- diskNumber_CentralDirStart
-			//			- numOfCentralDir
-			//			- numOfEntries;
-			//			- SizeOfCentralDir;
-			//			- OffsetOfCentralDirOffset;
-			//			- LengthOfCommentLength;
+			// TODO : EOCDR Temp format 채우기.
+			EOCDR.diskNumber = 0; // Temp
+			EOCDR.diskNumber_CentralDirStart = 0; // Temp
+			EOCDR.numOfCentralDir = 1;
+			EOCDR.numOfEntries = 1;
+			EOCDR.sizeOfCentralDir = sizeof(CentDir) + CentDir.lengthOfFileName;
+			// EOCDR.offsetCentralDir -> 실제 파일 Write 중에 작성.
+			EOCDR.lengthOfCommentLength = 0;
+		}
+
+		// Zip arhcive 파일 쓰기
+		{
+			ofstream fileOut(OUTPUT_FILE_NAME, ios::binary);
+			iRet = fileOut.is_open();
+			if (!iRet)
+			{
+				printf("FileOut open failed");
+			}
+			else
+			{
+				// 1. Local File Header, file name (var), extra field (var)
+				CentDir.offsetLocalFileHeader = fileOut.tellp();
+				fileOut.write(reinterpret_cast<const char*>(&LFHeader), sizeof(LFHeader));
+				fileOut.write(INPUT_FILE_NAME, LFHeader.lengthOfFileName);
+				//fileOut.write(NOT_USED, LFHeader.LFHeader.lengthOfExtraField);
+
+				// 2. File Data
+				fileOut.write(pFile, fileInSize);
+
+				// 3. CentralDirectory, file name (var)
+				EOCDR.offsetCentralDir = fileOut.tellp();
+				fileOut.write(reinterpret_cast<const char*>(&CentDir), sizeof(CentDir));
+				fileOut.write(INPUT_FILE_NAME, CentDir.lengthOfFileName);
+
+				// 4. End of CentralDirectory Record
+				fileOut.write(reinterpret_cast<const char*>(&EOCDR), sizeof(EOCDR));
+
+				fileOut.close();
+			}
 		}
 
 		// Free
@@ -141,7 +177,7 @@ bool ZipArchiver()
 	return iRet;
 }
 
-uint32_t getCRC32(const uint8_t* pData, size_t length)
+uint32_t getCRC32(const char* pData, size_t length)
 {
 	uint32_t crc = 0xFFFFFFFF;