7zheader.h

一个7ZIP的解压源码。比较详细。里面含有四种语言的实现代码。

// 7z/7zHeader.h

#ifndef __7Z_HEADER_H
#define __7Z_HEADER_H

#include "../../../Common/Types.h"

namespace NArchive {
namespace N7z {

const int kSignatureSize = 6;
extern Byte kSignature[kSignatureSize];

// #define _7Z_VOL
// 7z-MultiVolume is not finished yet.
// It can work already, but I still do not like some 
// things of that new multivolume format.
// So please keep it commented.

#ifdef _7Z_VOL
extern Byte kFinishSignature[kSignatureSize];
#endif

struct CArchiveVersion
{
  Byte Major;
  Byte Minor;
};

const Byte kMajorVersion = 0;

struct CStartHeader
{
  UInt64 NextHeaderOffset;
  UInt64 NextHeaderSize;
  UInt32 NextHeaderCRC;
};

const UInt32 kStartHeaderSize = 20;

#ifdef _7Z_VOL
struct CFinishHeader: public CStartHeader
{
  UInt64 ArchiveStartOffset;  // data offset from end if that struct
  UInt64 AdditionalStartBlockSize; // start  signature & start header size
};

const UInt32 kFinishHeaderSize = kStartHeaderSize + 16;
#endif

namespace NID
{
  enum EEnum
  {
    kEnd,

    kHeader,

    kArchiveProperties,
    
    kAdditionalStreamsInfo,
    kMainStreamsInfo,
    kFilesInfo,
    
    kPackInfo,
    kUnPackInfo,
    kSubStreamsInfo,

    kSize,
    kCRC,

    kFolder,

    kCodersUnPackSize,
    kNumUnPackStream,

    kEmptyStream,
    kEmptyFile,
    kAnti,

    kName,
    kCreationTime,
    kLastAccessTime,
    kLastWriteTime,
    kWinAttributes,
    kComment,

    kEncodedHeader,

    kStartPos
  };
}

}}

#endif