From 006ea5b62b01ac90b5557860cd2a7e05c0d1d596 Mon Sep 17 00:00:00 2001
From: Juno Kim <juno@sdskorea.com>
Date: Fri, 7 Aug 2026 09:05:31 +0900
Subject: [PATCH] add basic binary fread

---
 Define.h | 40 +++++++++++++++++++++++++++++-----------
 main.cpp | 45 ++++++++++++++++++++++++++++++++++++++-------
 2 files changed, 67 insertions(+), 18 deletions(-)

diff --git a/Define.h b/Define.h
index fcf3c40..341d7ba 100644
--- a/Define.h
+++ b/Define.h
@@ -56,10 +56,10 @@ constexpr int LOCAL_FILE_HEADER_BYTE = 30;
       uint16_t lastModTime;   // 압축 시점의 시간 (1980년 기준 시간)
       uint16_t lastModDate;   // 압축 시점의 날짜 (1980년 기준 연도)
       uint32_t crc32;
-      uint32_t compressedSize;  // same as unCompression (cuz no compreesion)
-      uint32_t unCompressedSize;
-      uint16_t fileNameLength;
-      uint16_t extraFieldLength;
+      uint32_t sizeOfCompressed;  // same as unCompression (cuz no compreesion)
+      uint32_t sizeOfUncompressed;
+      uint16_t lengthOfFileName;
+      uint16_t lengthOfExtraField;
 
       // var[fileNameLength] fileName
       // var[extraFieldLength] extraField
@@ -101,7 +101,6 @@ constexpr int LOCAL_FILE_HEADER_BYTE = 30;
 
  constexpr int CENTRAL_DIRECTORY_BYTE = 46;
  struct CentralDirectory {
-
       uint32_t signature;
       uint16_t versionMadeBy;
       uint16_t versionNeededToExtract;
@@ -130,16 +129,26 @@ constexpr int LOCAL_FILE_HEADER_BYTE = 30;
 
       end of central dir signature    4 bytes  (0x0605 + 4b50)
       number of this disk             2 bytes
+      
+      // 중앙 디렉터리가 시작되는 디스크의 번호.
       number of the disk with the
       start of the central directory  2 bytes
+      
+      // 이 디스크에 있는 중앙 디렉터리 항목의 수
       total number of entries in the
       central directory on this disk  2 bytes
+      
+      // .ZIP 파일 내 전체 파일 수
       total number of entries in
       the central directory           2 bytes
+      
       size of the central directory   4 bytes
+
+      // 중앙 디렉터리가 시작되는 디스크 상에서 중앙 디렉터리 시작 지점의 오프셋
       offset of start of central
       directory with respect to
       the starting disk number        4 bytes
+
       .ZIP file comment length        2 bytes
       .ZIP file comment       (variable size)
 */
@@ -147,13 +156,22 @@ constexpr int LOCAL_FILE_HEADER_BYTE = 30;
 
  struct EoCDRecord {
       uint32_t signature;
+      
+      // central directory end record을 포함하는 이 디스크의 번호
       uint16_t diskNumber;
-      uint16_t diskNumber_CentralDirectoryStart;
-      uint16_t numOfCentralDirectory;   // TODO : 이름 애매함.
-      uint16_t numEntries;              // TODO : 이름 애매함.
-      uint32_t centralDirectorySize;
-      uint32_t centralDirectoryOffset;
-      uint16_t zipFileCommentLength;
+
+      // 중앙 디렉터리가 시작되는 디스크의 번호.
+      uint16_t diskNumber_CentralDirStart;
+
+      // 이 디스크에 있는 중앙 디렉터리 항목의 수
+      uint16_t numOfCentralDir;
+
+      // .ZIP 파일 내 전체 파일 수
+      uint16_t numOfEntries;
+      
+      uint32_t SizeOfCentralDir;
+      uint32_t OffsetOfCentralDirOffset;
+      uint16_t LengthOfCommentLength;
 
       // var[zipFileCommentLength] zipFileComment
 };
diff --git a/main.cpp b/main.cpp
index 17c052a..8cb65fe 100644
--- a/main.cpp
+++ b/main.cpp
@@ -1,15 +1,17 @@
 #include <cstdio>
+#include <iostream>
+#include <fstream>
 #include "Define.h"
 
-void Zipper();
+int ZipArchiver();
 
 int main()
 {
 	std::printf("==================== Hello Zip! ====================\r\n");
-
 	int iRet = 0;
 
-	int iSizeTest = sizeof(LocalFileHeader);
+	// Zip Format define check
+	size_t iSizeTest = sizeof(LocalFileHeader);
 	if (LOCAL_FILE_HEADER_BYTE != iSizeTest)
 	{
 		std::printf("1 Wrong Header Size : %d / %d \r\n", iSizeTest, LOCAL_FILE_HEADER_BYTE);
@@ -28,19 +30,48 @@ int main()
 		iRet = -1;
 	}
 
+	// Main Zip archive method
 	if (iRet != -1)
 	{
-		Zipper();
+		iRet = ZipArchiver();
 	}
 
-	return 0;
+	return iRet;
 }
 
-void Zipper()
+int ZipArchiver()
 {
 	LocalFileHeader LFHeader;
 	CentralDirectory CentDirec;
 	EoCDRecord ECDR;
 
+	using namespace std;
 
-}
\ No newline at end of file
+	ifstream fileIn("MyZip.txt", ios::binary);
+	bool iRet = fileIn.is_open();
+	if (!iRet)
+	{
+		printf("File open failed");
+	}
+	else
+	{
+		// ���� ũ�� ���
+		// seekg(offset, ��ǥ��)
+		fileIn.seekg(0, ios::end);
+		streamsize fileInSize = fileIn.tellg();
+		// beg == begin
+		fileIn.seekg(0, ios::beg);
+
+		// TODO : Buffering ���� ����.
+		// �޸� �Ҵ�
+		uint8_t* pFile = (uint8_t *)malloc(fileInSize);
+
+		// Read
+		fileIn.read((char *)pFile, fileInSize);
+
+		// Free
+		free(pFile);
+	}
+
+	return iRet;
+}