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add Zip format Define.h

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JunHo
2026-08-07 07:58:28 +09:00
parent 8d3245b197
commit f175be3938
3 changed files with 206 additions and 2 deletions
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Define.h
+161
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@@ -0,0 +1,161 @@
#pragma once
#include <cstdint>
/** Overall .ZIP file format:
[local file header 1] -> "PK" + 0x4b50 + ...
[encryption header 1]
[file data 1]
[data descriptor 1]
.
.
.
[local file header n] -> "PK" + 0x4b50 + ...
[encryption header n]
[file data n]
[data descriptor n]
[archive decryption header]
[archive extra data record]
[central directory header 1]
.
.
.
[central directory header n] -> "PK" + 0x4b50
[zip64 end of central directory record]
[zip64 end of central directory locator]
[end of central directory record] <- 필수 포함 (단 한개)
*/
/** Local file header:
local file header signature 4 bytes (0x04034b50)
version needed to extract 2 bytes
general purpose bit flag 2 bytes
compression method 2 bytes
last mod file time 2 bytes
last mod file date 2 bytes
crc-32 4 bytes
compressed size 4 bytes
uncompressed size 4 bytes
file name length 2 bytes -> Variable
extra field length 2 bytes -> Variable
file name (variable size)
extra field (variable size)
*/
#pragma pack(push, 1)
constexpr int LOCAL_FILE_HEADER_BYTE = 30;
struct LocalFileHeader {
uint32_t signature;
uint16_t versionNeededToExtract;
uint16_t generalBitFlag;
uint16_t compressionMethod; // no compression == 0
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;
// var[fileNameLength] fileName
// var[extraFieldLength] extraField
};
/** Central directory structure:
[central directory header 1]
.
.
.
[central directory header n]
[digital signature]
File header:
central file header signature 4 bytes (0x02014b50)
version made by 2 bytes
version needed to extract 2 bytes
general purpose bit flag 2 bytes
compression method 2 bytes
last mod file time 2 bytes
last mod file date 2 bytes
crc-32 4 bytes
compressed size 4 bytes
uncompressed size 4 bytes
file name length 2 bytes
extra field length 2 bytes
file comment length 2 bytes
disk number start 2 bytes
internal file attributes 2 bytes
external file attributes 4 bytes
relative offset of local header 4 bytes
file name (variable size)
extra field (variable size)
file comment (variable size)
*/
constexpr int CENTRAL_DIRECTORY_BYTE = 46;
struct CentralDirectory {
uint32_t signature;
uint16_t versionMadeBy;
uint16_t versionNeededToExtract;
uint16_t generalBitFlag;
uint16_t compressionMethod; // no compression == 0
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;
uint16_t fileCommentLength;
uint16_t diskNumStart;
uint16_t attributeInternal;
uint32_t attributeExternal;
uint32_t offsetLocalHeader;
// var[fileNameLength] fileName
// var[extraFieldLength] extraField
// var[fileCommentLength] fileComment
};
/** End of central directory record:
end of central dir signature 4 bytes (0x0605 + 4b50)
number of this disk 2 bytes
number of the disk with the
start of the central directory 2 bytes
total number of entries in the
central directory on this disk 2 bytes
total number of entries in
the central directory 2 bytes
size of the central directory 4 bytes
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)
*/
constexpr int EOCD_BYTE = 22;
struct EoCDRecord {
uint32_t signature;
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;
// var[zipFileCommentLength] zipFileComment
};
#pragma pack(pop)
MyZip.vcxproj
+4 -1
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@@ -1,4 +1,4 @@
<?xml version="1.0" encoding="utf-8"?>
<?xml version="1.0" encoding="utf-8"?>
<Project DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
<ItemGroup Label="ProjectConfigurations">
<ProjectConfiguration Include="Debug|Win32">
@@ -125,6 +125,9 @@
<ItemGroup>
<ClCompile Include="main.cpp" />
</ItemGroup>
<ItemGroup>
<ClInclude Include="Define.h" />
</ItemGroup>
<Import Project="$(VCTargetsPath)\Microsoft.Cpp.targets" />
<ImportGroup Label="ExtensionTargets">
</ImportGroup>
main.cpp
+41 -1
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@@ -1,6 +1,46 @@
#include <cstdio>
#include "Define.h"
void Zipper();
int main()
{
std::printf("Hello Zip! \r\n");
std::printf("==================== Hello Zip! ====================\r\n");
int iRet = 0;
int iSizeTest = sizeof(LocalFileHeader);
if (LOCAL_FILE_HEADER_BYTE != iSizeTest)
{
std::printf("1 Wrong Header Size : %d / %d \r\n", iSizeTest, LOCAL_FILE_HEADER_BYTE);
iRet = -1;
}
iSizeTest = sizeof(CentralDirectory);
if (CENTRAL_DIRECTORY_BYTE != iSizeTest)
{
std::printf("2 Wrong Header Size : %d / %d \r\n", iSizeTest, CENTRAL_DIRECTORY_BYTE);
iRet = -1;
}
iSizeTest = sizeof(EoCDRecord);
if (EOCD_BYTE != iSizeTest)
{
std::printf("3 Wrong Header Size : %d / %d \r\n", iSizeTest, EOCD_BYTE);
iRet = -1;
}
if (iRet != -1)
{
Zipper();
}
return 0;
}
void Zipper()
{
LocalFileHeader LFHeader;
CentralDirectory CentDirec;
EoCDRecord ECDR;
}