Microsoft公司 .CAB文件格式

_Inside Windows Cabinet Files_

Listing One

// =================================================================

// CAB FILE LAYOUT

// =================================================================

/*

(1) CAB_HEADER structure

(2) Reserved area, if CAB_HEADER.flags & CAB_FLAG_RESERVE

(3) Previous cabinet name, if CAB_HEADER.flags & CAB_FLAG_HASPREV

(4) Previous disk name, if CAB_HEADER.flags & CAB_FLAG_HASPREV

(5) Next cabinet name, if CAB_HEADER.flags & CAB_FLAG_HASNEXT

(6) Next disk name, if CAB_HEADER.flags & CAB_FLAG_HASNEXT

(7) CAB_FOLDER structures (n = CAB_HEADER.cFolders)

(8) CAB_ENTRY structures / file names (n = CAB_HEADER.cFiles)

(9) File data (offset = CAB_FOLDER.coffCabStart)

*/
// =================================================================

// MACROS

// =================================================================

#define SWAPWORD(x) ((WORD) (((x) << 8) | ((x) >> 8)))

#define SWAPDWORD(x) ((SWAPWORD ((WORD) (x)) << 16) | /

(SWAPWORD ((WORD) ((x) >> 16))))

// =================================================================

// CONSTANTS

// =================================================================

#define CAB_SIGNATURE SWAPDWORD ('MSCF')

#define CAB_VERSION 0x0103
#define CAB_FLAG_HASPREV 0x0001

#define CAB_FLAG_HASNEXT 0x0002

#define CAB_FLAG_RESERVE 0x0004
#define CAB_ATTRIB_READONLY 0x0001

#define CAB_ATTRIB_HIDDEN 0x0002

#define CAB_ATTRIB_SYSTEM 0x0004

#define CAB_ATTRIB_VOLUME 0x0008

#define CAB_ATTRIB_DIRECTORY 0x0010

#define CAB_ATTRIB_ARCHIVE 0x0020
#define CAB_FILE_FIRST 0x0000

#define CAB_FILE_NEXT 0x0001

#define CAB_FILE_SPLIT 0xFFFE

#define CAB_FILE_CONTINUED 0xFFFD
#define CAB_NOTIFY_OK 1

#define CAB_NOTIFY_ERROR 0

#define CAB_NOTIFY_SKIP 0

#define CAB_NOTIFY_ABORT (-1)
// =================================================================

// CABINET STRUCTURES

// =================================================================

typedef struct _CAB_HEADER

{

DWORD sig; // file signature 'MSCF' (CAB_SIGNATURE)

DWORD csumHeader; // header checksum (0 if not used)

DWORD cbCabinet; // cabinet file size

DWORD csumFolders; // folders checksum (0 if not used)

DWORD coffFiles; // offset of first CAB_ENTRY

DWORD csumFiles; // files checksum (0 if not used)

WORD version; // cabinet version (CAB_VERSION)

WORD cFolders; // number of folders

WORD cFiles; // number of files

WORD flags; // cabinet flags (CAB_FLAG_*)

WORD setID; // cabinet set id

WORD iCabinet; // zero-based cabinet number

}

CAB_HEADER, *PCAB_HEADER;

#define CAB_HEADER_ sizeof (CAB_HEADER)
// -----------------------------------------------------------------

typedef struct _CAB_FOLDER

{

DWORD coffCabStart; // offset of folder data

WORD cCFData; // ???

WORD typeCompress; // compression type (tcomp* in FDI.h)
}

CAB_FOLDER, *PCAB_FOLDER;

#define CAB_FOLDER_ sizeof (CAB_FOLDER)
// -----------------------------------------------------------------

typedef struct _CAB_ENTRY

{

DWORD cbFile; // uncompressed file size

DWORD uoffFolderStart; // file offset after decompression

WORD iFolder; // file control id (CAB_FILE_*)

WORD date; // file date stamp, as used by DOS

WORD time; // file time stamp, as used by DOS

WORD attribs; // file attributes (CAB_ATTRIB_*)

}

CAB_ENTRY, *PCAB_ENTRY;

#define CAB_ENTRY_ sizeof (CAB_ENTRY)

Listing Two

// =================================================================

// FILE EXTRACTION CALLBACK

// =================================================================

int DIAMONDAPI FDIExtract (FDINOTIFICATIONTYPE fdint,

PFDINOTIFICATION pfdin)

{

FILETIME ft, lft;

BYTE abFile [MAX_PATH];

int hf, iResult;
switch (fdint)

{

case fdintCOPY_FILE:

if (lstrcmpi (pfdin->psz1,

((PEXTRACT_FILE) pfdin->pv)->pbEntry))

{

iResult = CAB_NOTIFY_SKIP;

}

else

{

hf = FDIOpen (((PEXTRACT_FILE) pfdin->pv)->pbFile,

_O_RDWR | _O_CREAT | _O_TRUNC,

_S_IREAD | _S_IWRITE);

if (hf != -1)

{

iResult = hf;

}

else

{

printfMessage

(((PEXTRACT_FILE) pfdin->pv)->hWnd,

MB_ICONERROR | MB_OK,

"CabLib Error",

"Unable to create file /"%s/"",

((PEXTRACT_FILE) pfdin->pv)->pbFile);

iResult = CAB_NOTIFY_ABORT;
}

}

break;

case fdintNEXT_CABINET:

if (lstrlen (pfdin->psz3) lstrlen (pfdin->psz1)

< MAX_PATH)

{

lstrcpy (abFile, pfdin->psz3);

lstrcat (abFile, pfdin->psz1);

hf = FDIOpen (abFile, _O_RDONLY, 0);

}

else

{

hf = -1;

}

if (hf != -1)

{

FDIClose (hf);

iResult = CAB_NOTIFY_OK;

}

else

{

printfMessage (((PEXTRACT_FILE) pfdin->pv)->hWnd,

MB_ICONERROR | MB_OK,

"CabLib Error",

"Unable to open file /"%s%s/"",

pfdin->psz3,

pfdin->psz1);

iResult = CAB_NOTIFY_ABORT;

}

break;

case fdintCLOSE_FILE_INFO:

DosDateTimeToFileTime (pfdin->date, pfdin->time, &lft);

LocalFileTimeToFileTime (&lft, &ft);

SetFileTime ((HANDLE) pfdin->hf, &ft, &ft, &ft);
if (FDIClose (pfdin->hf) == -1)

{

printfMessage (((PEXTRACT_FILE) pfdin->pv)->hWnd,

MB_ICONERROR | MB_OK,

"CabLib Error",

"Unable to close file /"%s/"",

((PEXTRACT_FILE) pfdin->pv)->pbFile);

}

iResult = CAB_NOTIFY_OK;

break;

default:

iResult = CAB_NOTIFY_OK;

break;

}

return iResult;

}

Example 1:

HFDI FAR DIAMONDAPI FDICreate (PFNALLOC pfnalloc,

PFNFREE pfnfree,

PFNOPEN pfnopen,

PFNREAD pfnread,

PFNWRITE pfnwrite,

PFNCLOSE pfnclose,

PFNSEEK pfnseek,

int cpuType,

PERF perf);
Example 2:

BOOL FAR DIAMONDAPI FDICopy (HFDI hfdi,

char FAR *pszCabinet,

char FAR *pszCabPath,

int flags,

PFNFDINOTIFY pfnfdin,

PFNFDIDECRYPT pfnfdid,

void FAR *pvUser);
4