/*
* FDI.H -- File Decompression Interface
*
* Copyright (C) Microsoft Corporation 1993-1997
* All Rights Reserved.
*/
#ifdef __cplusplus
extern "C" {
#endif
#ifndef INCLUDED_TYPES_FCI_FDI
#define INCLUDED_TYPES_FCI_FDI 1
#ifndef HUGE
#define HUGE
#endif
#ifndef FAR
#define FAR
#endif
#ifndef DIAMONDAPI
#define DIAMONDAPI __cdecl
#endif
//** Specify structure packing explicitly for clients of FDI
#pragma pack(4)
//** Don't redefine types defined in Win16 WINDOWS.H (_INC_WINDOWS)
// or Win32 WINDOWS.H (_WINDOWS_)
//
#if !defined(_INC_WINDOWS) && !defined(_WINDOWS_)
typedef int BOOL; /* f */
typedef unsigned char BYTE; /* b */
typedef unsigned int UINT; /* ui */
typedef unsigned short USHORT; /* us */
typedef unsigned long ULONG; /* ul */
#endif // _INC_WINDOWS
typedef unsigned long CHECKSUM; /* csum */
typedef unsigned long UOFF; /* uoff - uncompressed offset */
typedef unsigned long COFF; /* coff - cabinet file offset */
#ifndef TRUE
#define TRUE 1
#endif
#ifndef FALSE
#define FALSE 0
#endif
#ifndef NULL
#define NULL 0
#endif
/*** ERF - Error structure
*
* This structure returns error information from FCI/FDI. The caller should
* not modify this structure.
*/
typedef struct {
int erfOper; // FCI/FDI error code -- see FDIERROR_XXX
// and FCIERR_XXX equates for details.
int erfType; // Optional error value filled in by FCI/FDI.
// For FCI, this is usually the C run-time
// *errno* value.
BOOL fError; // TRUE => error present
} ERF; /* erf */
typedef ERF FAR *PERF; /* perf */
#ifdef _DEBUG
// don't hide statics from map during debugging
#define STATIC
#else // !DEBUG
#define STATIC static
#endif // !DEBUG
#define CB_MAX_CHUNK 32768U
#define CB_MAX_DISK 0x7fffffffL
#define CB_MAX_FILENAME 256
#define CB_MAX_CABINET_NAME 256
#define CB_MAX_CAB_PATH 256
#define CB_MAX_DISK_NAME 256
/*** tcompXXX - Compression types
*
* These are passed to FCIAddFile(), and are also stored in the CFFOLDER
* structures in cabinet files.
*
* NOTE: We reserve bits for the TYPE, QUANTUM_LEVEL, and QUANTUM_MEM
* to provide room for future expansion. Since this value is stored
* in the CFDATA records in the cabinet file, we don't want to
* have to change the format for existing compression configurations
* if we add new ones in the future. This will allows us to read
* old cabinet files in the future.
*/
typedef unsigned short TCOMP; /* tcomp */
#define tcompMASK_TYPE 0x000F // Mask for compression type
#define tcompTYPE_NONE 0x0000 // No compression
#define tcompTYPE_MSZIP 0x0001 // MSZIP
#define tcompTYPE_QUANTUM 0x0002 // Quantum
#define tcompTYPE_LZX 0x0003 // LZX
#define tcompBAD 0x000F // Unspecified compression type
#define tcompMASK_LZX_WINDOW 0x1F00 // Mask for LZX Compression Memory
#define tcompLZX_WINDOW_LO 0x0F00 // Lowest LZX Memory (15)
#define tcompLZX_WINDOW_HI 0x1500 // Highest LZX Memory (21)
#define tcompSHIFT_LZX_WINDOW 8 // Amount to shift over to get int
#define tcompMASK_QUANTUM_LEVEL 0x00F0 // Mask for Quantum Compression Level
#define tcompQUANTUM_LEVEL_LO 0x0010 // Lowest Quantum Level (1)
#define tcompQUANTUM_LEVEL_HI 0x0070 // Highest Quantum Level (7)
#define tcompSHIFT_QUANTUM_LEVEL 4 // Amount to shift over to get int
#define tcompMASK_QUANTUM_MEM 0x1F00 // Mask for Quantum Compression Memory
#define tcompQUANTUM_MEM_LO 0x0A00 // Lowest Quantum Memory (10)
#define tcompQUANTUM_MEM_HI 0x1500 // Highest Quantum Memory (21)
#define tcompSHIFT_QUANTUM_MEM 8 // Amount to shift over to get int
#define tcompMASK_RESERVED 0xE000 // Reserved bits (high 3 bits)
#define CompressionTypeFromTCOMP(tc) \
((tc) & tcompMASK_TYPE)
#define CompressionLevelFromTCOMP(tc) \
(((tc) & tcompMASK_QUANTUM_LEVEL) >> tcompSHIFT_QUANTUM_LEVEL)
#define CompressionMemoryFromTCOMP(tc) \
(((tc) & tcompMASK_QUANTUM_MEM) >> tcompSHIFT_QUANTUM_MEM)
#define TCOMPfromTypeLevelMemory(t,l,m) \
(((m) << tcompSHIFT_QUANTUM_MEM ) | \
((l) << tcompSHIFT_QUANTUM_LEVEL) | \
( t ))
#define LZXCompressionWindowFromTCOMP(tc) \
(((tc) & tcompMASK_LZX_WINDOW) >> tcompSHIFT_LZX_WINDOW)
#define TCOMPfromLZXWindow(w) \
(((w) << tcompSHIFT_LZX_WINDOW ) | \
( tcompTYPE_LZX ))
//** Revert to default structure packing
#pragma pack()
#endif // !INCLUDED_TYPES_FCI_FDI
/*
* Concepts:
* A *cabinet* file contains one or more *folders*. A folder contains
* one or more (pieces of) *files*. A folder is by definition a
* decompression unit, i.e., to extract a file from a folder, all of
* the data from the start of the folder up through and including the
* desired file must be read and decompressed.
*
* A folder can span one (or more) cabinet boundaries, and by implication
* a file can also span one (or more) cabinet boundaries. Indeed, more
* than one file can span a cabinet boundary, since FCI concatenates
* files together into a single data stream before compressing (actually,
* at most one file will span any one cabinet boundary, but FCI does
* not know which file this is, since the mapping from uncompressed bytes
* to compressed bytes is pretty obscure. Also, since FCI compresses
* in blocks of 32K (at present), any files with data in a 32K block that
* spans a cabinet boundary require FDI to read both cabinet files
* to get the two halves of the compressed block).
*
* Overview:
* The File Decompression Interface is used to simplify the reading of
* cabinet files. A setup program will proceed in a manner very
* similar to the pseudo code below. An FDI context is created, the
* setup program calls FDICopy() for each cabinet to be processed. For
* each file in the cabinet, FDICopy() calls a notification callback
* routine, asking the setup program if the file should be copied.
* This call-back approach is great because it allows the cabinet file
* to be read and decompressed in an optimal manner, and also makes FDI
* independent of the run-time environment -- FDI makes *no* C run-time
* calls whatsoever. All memory allocation and file I/O functions are
* passed into FDI by the client.
*
* main(...)
* {
* // Read INF file to construct list of desired files.
* // Ideally, these would be sorted in the same order as the
* // files appear in the cabinets, so that you can just walk
* // down the list in response to fdintCOPY_FILE notifications.
*
* // Construct list of required cabinets.
*
* hfdi = FDICreate(...); // Create FDI context
* For (cabinet in List of Cabinets) {
* FDICopy(hfdi,cabinet,fdiNotify,...); // Process each cabinet
* }
* FDIDestroy(hfdi);
* ...
* }
*
* // Notification callback function
* fdiNotify(fdint,...)
* {
* If (User Aborted) // Permit cancellation
* if (fdint == fdintCLOSE_FILE_INFO)
* close open file
* return -1;
* switch (fdint) {
* case fdintCOPY_FILE: // File to copy, maybe
* // Check file against list of desired files
* if want to copy file
* open destination file and return handle
* else
* return NULL; // Skip file
* case fdintCLOSE_FILE_INFO:
* close file
* set date, time, and attributes
*
* case fdintNEXT_CABINET:
* if not an error callback
* Tell FDI to use suggested directory name
* else
* Tell user what the problem was, and prompt
* for a new disk and/or path.
* if user aborts
* Tell FDI to abort
* else
* return to FDI to try another cabinet
*
* default:
* return 0; // more messages may be defined
* ...
* }
*
* Error Handling Suggestions:
* Since you the client have passed in *all* of the functions that
* FDI uses to interact with the "outside" world, you are in prime
* position to understand and deal with errors.
*
* The general philosophy of FDI is to pass all errors back up to
* the client. FDI returns fairly generic error codes in the case
* where one of the callback functions (PFNOPEN, PFNREAD, etc.) fail,
* since it assumes that the callback function will save enough
* information in a static/global so that when FDICopy() returns
* fail, the client can examine this information and report enough
* detail about the problem that the user can take corrective action.
*
* For very specific errors (CORRUPT_CABINET, for example), FDI returns
* very specific error codes.
*
* THE BEST POLICY IS FOR YOUR CALLBACK ROUTINES TO AVOID RETURNING
* ERRORS TO FDI!
*
* Examples:
* (1) If the disk is getting full, instead of returning an error
* from your PFNWRITE function, you should -- inside your
* PFNWRITE function -- put up a dialog telling the user to free
* some disk space.
* (2) When you get the fdintNEXT_CABINET notification, you should
* verify that the cabinet you return is the correct one (call
* FDIIsCabinet(), and make sure the setID matches the one for
* the current cabinet specified in the fdintCABINET_INFO, and
* that the disk number is one greater.
*
* NOTE: FDI will continue to call fdintNEXT_CABINET until it
* gets the cabinet it wants, or until you return -1
* to abort the FDICopy() call.
*
* The documentation below on the FDI error codes provides explicit
* guidance on how to avoid each error.
*
* If you find you must return a failure to FDI from one of your
* callback functions, then FDICopy() frees all resources it allocated
* and closes all files. If you can figure out how to overcome the
* problem, you can call FDICopy() again on the last cabinet, and
* skip any files that you already copied. But, note that FDI does
* *not* maintain any state between FDICopy() calls, other than possibly
* memory allocated for the decompressor.
*
* See FDIERROR for details on FDI error codes and recommended actions.
*
*
* Progress Indicator Suggestions:
* As above, all of the file I/O functions are supplied by you. So,
* updating a progress indicator is very simple. You keep track of
* the target files handles you have opened, along with the uncompressed
* size of the target file. When you see writes to the handle of a
* target file, you use the write count to update your status!
* Since this method is available, there is no separate callback from
* FDI just for progess indication.
*/
#ifndef INCLUDED_FDI
#define INCLUDED_FDI 1
//** Specify structure packing explicitly for clients of FDI
#pragma pack(4)
/*** FDIERROR - Error codes returned in erf.erfOper field
*
* In general, FDI will only fail if one of the passed in memory or
* file I/O functions fails. Other errors are pretty unlikely, and are
* caused by corrupted cabinet files, passing in a file which is not a
* cabinet file, or cabinet files out of order.
*
* Description: Summary of error.
* Cause: List of possible causes of this error.
* Response: How client might respond to this error, or avoid it in
* the first place.
*/
typedef enum {
FDIERROR_NONE,
// Description: No error
// Cause: Function was successfull.
// Response: Keep going!
FDIERROR_CABINET_NOT_FOUND,
// Description: Cabinet not found
// Cause: Bad file name or path passed to FDICopy(), or returned
// to fdintNEXT_CABINET.
// Response: To prevent this error, validate the existence of the
// the cabinet *before* passing the path to FDI.
FDIERROR_NOT_A_CABINET,
// Description: Cabinet file does not have the correct format
// Cause: File passed to to FDICopy(), or returned to
// fdintNEXT_CABINET, is too small to be a cabinet file,
// or does not have the cabinet signature in its first
// four bytes.
// Response: To prevent this error, call FDIIsCabinet() to check a
// cabinet before calling FDICopy() or returning the
// cabinet path to fdintNEXT_CABINET.
FDIERROR_UNKNOWN_CABINET_VERSION,
// Description: Cabinet file has an unknown version number.
// Cause: File passed to to FDICopy(), or returned to
// fdintNEXT_CABINET, has what looks like a cabinet file
// header, but the version of the cabinet file format
// is not one understood by this version of FDI. The
// erf.erfType field is filled in with the version number
// found in the cabinet file.
// Response: To prevent this error, call FDIIsCabinet() to check a
// cabinet before calling FDICopy() or returning the
// cabinet path to fdintNEXT_CABINET.
FDIERROR_CORRUPT_CABINET,
// Description: Cabinet file is corrupt
// Cause: FDI returns this error any time it finds a problem
// with the logical format of a cabinet file, and any
// time one of the passed-in file I/O calls fails when
// operating on a cabinet (PFNOPEN, PFNSEEK, PFNREAD,
// or PFNCLOSE). The client can distinguish these two
// cases based upon whether the last file I/O call
// failed or not.
// Response: Assuming this is not a real corruption problem in
// a cabinet file, the file I/O functions could attempt
// to do retries on failure (for example, if there is a
// temporary network connection problem). If this does
// not work, and the file I/O call has to fail, then the
// FDI client will have to clean up and call the
// FDICopy() function again.
FDIERROR_ALLOC_FAIL,
// Description: Could not allocate enough memory
// Cause: FDI tried to allocate memory with the PFNALLOC
// function, but it failed.
// Response: If possible, PFNALLOC should take whatever steps
// are possible to allocate the memory requested. If
// memory is not immediately available, it might post a
// dialog asking the user to free memory, for example.
// Note that the bulk of FDI's memory allocations are
// made at FDICreate() time and when the first cabinet
// file is opened during FDICopy().
FDIERROR_BAD_COMPR_TYPE,
// Description: Unknown compression type in a cabinet folder
// Cause: [Should never happen.] A folder in a cabinet has an
// unknown compression type. This is probably caused by
// a mismatch between the version of FCI.LIB used to
// create the cabinet and the FDI.LIB used to read the
// cabinet.
// Response: Abort.
FDIERROR_MDI_FAIL,
// Description: Failure decompressing data from a cabinet file
// Cause: The decompressor found an error in the data coming
// from the file cabinet. The cabinet file was corrupted.
// [11-Apr-1994 bens When checksuming is turned on, this
// error should never occur.]
// Response: Probably should abort; only other choice is to cleanup
// and call FDICopy() again, and hope there was some
// intermittent data error that will not reoccur.
FDIERROR_TARGET_FILE,
// Description: Failure writing to target file
// Cause: FDI returns this error any time it gets an error back
// from one of the passed-in file I/O calls fails when
// writing to a file being extracted from a cabinet.
// Response: To avoid or minimize this error, the file I/O functions
// could attempt to avoid failing. A common cause might
// be disk full -- in this case, the PFNWRITE function
// could have a check for free space, and put up a dialog
// asking the user to free some disk space.
FDIERROR_RESERVE_MISMATCH,
// Description: Cabinets in a set do not have the same RESERVE sizes
// Cause: [Should never happen]. FDI requires that the sizes of
// the per-cabinet, per-folder, and per-data block
// RESERVE sections be consistent across all the cabinets
// in a set.
// Response: Abort.
FDIERROR_WRONG_CABINET,
// Description: Cabinet returned on fdintNEXT_CABINET is incorrect
// Cause: NOTE: THIS ERROR IS NEVER RETURNED BY FDICopy()!
// Rather, FDICopy() keeps calling the fdintNEXT_CABINET
// callback until either the correct cabinet is specified,
// or you return ABORT.
// When FDICopy() is extracting a file that crosses a
// cabinet boundary, it calls fdintNEXT_CABINET to ask
// for the path to the next cabinet. Not being very
// trusting, FDI then checks to make sure that the
// correct continuation cabinet was supplied! It does
// this by checking the "setID" and "iCabinet" fields
// in the cabinet. When MAKECAB.EXE creates a set of
// cabinets, it constructs the "setID" using the sum
// of the bytes of all the destination file names in
// the cabinet set. FDI makes sure that the 16-bit
// setID of the continuation cabinet matches the
// cabinet file just processed. FDI then checks that
// the cabinet number (iCabinet) is one more than the
// cabinet number for the cabinet just processed.
// Response: You need code in your fdintNEXT_CABINET (see below)
// handler to do retries if you get recalled with this
// error. See the sample code (EXTRACT.C) to see how
// this should be handled.
FDIERROR_USER_ABORT,
// Description: FDI aborted.
// Cause: An FDI callback returnd -1 (usually).
// Response: Up to client.
} FDIERROR;
/*
* FAT file attribute flag used by FCI/FDI to indicate that
* the filename in the CAB is a UTF string
*/
#ifndef _A_NAME_IS_UTF
#define _A_NAME_IS_UTF 0x80
#endif
/*
* FAT file attribute flag used by FCI/FDI to indicate that
* the file should be executed after extraction
*/
#ifndef _A_EXEC
#define _A_EXEC 0x40
#endif
/*** HFDI - Handle to an FDI context
*
* FDICreate() creates this, and it must be passed to all other FDI
* functions.
*/
typedef void FAR *HFDI; /* hfdi */
/*** FDICABINETINFO - Information about a cabinet
*
*/
typedef struct {
long cbCabinet; // Total length of cabinet file
USHORT cFolders; // Count of folders in cabinet
USHORT cFiles; // Count of files in cabinet
USHORT setID; // Cabinet set ID
USHORT iCabinet; // Cabinet number in set (0 based)
BOOL fReserve; // TRUE => RESERVE present in cabinet
BOOL hasprev; // TRUE => Cabinet is chained prev
BOOL hasnext; // TRUE => Cabinet is chained next
} FDICABINETINFO; /* fdici */
typedef FDICABINETINFO FAR *PFDICABINETINFO; /* pfdici */
/*** FDIDECRYPTTYPE - PFNFDIDECRYPT command types
*
*/
typedef enum {
fdidtNEW_CABINET, // New cabinet
fdidtNEW_FOLDER, // New folder
fdidtDECRYPT, // Decrypt a data block
} FDIDECRYPTTYPE; /* fdidt */
/*** FDIDECRYPT - Data for PFNFDIDECRYPT function
*
*/
typedef struct {
FDIDECRYPTTYPE fdidt; // Command type (selects union below)
void FAR *pvUser; // Decryption context
union {
struct { // fdidtNEW_CABINET
void FAR *pHeaderReserve; // RESERVE section from CFHEADER
USHORT cbHeaderReserve; // Size of pHeaderReserve
USHORT setID; // Cabinet set ID
int iCabinet; // Cabinet number in set (0 based)
} cabinet;
struct { // fdidtNEW_FOLDER
void FAR *pFolderReserve; // RESERVE section from CFFOLDER
USHORT cbFolderReserve; // Size of pFolderReserve
USHORT iFolder; // Folder number in cabinet (0 based)
} folder;
struct { // fdidtDECRYPT
void FAR *pDataReserve; // RESERVE section from CFDATA
USHORT cbDataReserve; // Size of pDataReserve
void FAR *pbData; // Data buffer
USHORT cbData; // Size of data buffer
BOOL fSplit; // TRUE if this is a split data block
USHORT cbPartial; // 0 if this is not a split block, or
// the first piece of a split block;
// Greater than 0 if this is the
// second piece of a split block.
} decrypt;
};
} FDIDECRYPT; /* fdid */
typedef FDIDECRYPT FAR *PFDIDECRYPT; /* pfdid */
/*** FNALLOC - Memory Allocation
* FNFREE - Memory Free
*
* These are modeled after the C run-time routines malloc() and free()
* FDI expects error handling to be identical to these C run-time routines.
*
* As long as you faithfully copy the semantics of malloc() and free(),
* you can supply any functions you like!
*
* WARNING: You should never assume anything about the sequence of
* PFNALLOC and PFNFREE calls -- incremental releases of
* FDI may have radically different numbers of
* PFNALLOC calls and allocation sizes!
*/
//** Memory functions for FDI
typedef void HUGE * (FAR DIAMONDAPI *PFNALLOC)(ULONG cb); /* pfna */
#define FNALLOC(fn) void HUGE * FAR DIAMONDAPI fn(ULONG cb)
typedef void (FAR DIAMONDAPI *PFNFREE)(void HUGE *pv); /* pfnf */
#define FNFREE(fn) void FAR DIAMONDAPI fn(void HUGE *pv)
/*** PFNOPEN - File I/O callbacks for FDI
* PFNREAD
* PFNWRITE
* PFNCLOSE
* PFNSEEK
*
* These are modeled after the C run-time routines _open, _read,
* _write, _close, and _lseek. The values for the PFNOPEN oflag
* and pmode calls are those defined for _open. FDI expects error
* handling to be identical to these C run-time routines.
*
* As long as you faithfully copy these aspects, you can supply
* any functions you like!
*
* WARNING: You should never assume you know what file is being
* opened at any one point in time! FDI will usually
* stick to opening cabinet files, but it is possible
* that in a future implementation it may open temporary
* files or open cabinet files in a different order.
*
* Notes for Memory Mapped File fans:
* You can write wrapper routines to allow FDI to work on memory
* mapped files. You'll have to create your own "handle" type so that
* you can store the base memory address of the file and the current
* seek position, and then you'll allocate and fill in one of these
* structures and return a pointer to it in response to the PFNOPEN
* call and the fdintCOPY_FILE call. Your PFNREAD and PFNWRITE
* functions will do memcopy(), and update the seek position in your
* "handle" structure. PFNSEEK will just change the seek position
* in your "handle" structure.
*/
//** File I/O functions for FDI
typedef int (FAR DIAMONDAPI *PFNOPEN) (char FAR *pszFile, int oflag, int pmode);
typedef UINT (FAR DIAMONDAPI *PFNREAD) (int hf, void FAR *pv, UINT cb);
typedef UINT (FAR DIAMONDAPI *PFNWRITE)(int hf, void FAR *pv, UINT cb);
typedef int (FAR DIAMONDAPI *PFNCLOSE)(int hf);
typedef long (FAR DIAMONDAPI *PFNSEEK) (int hf, long dist, int seektype);
#define FNOPEN(fn) int FAR DIAMONDAPI fn(char FAR *pszFile, int oflag, int pmode)
#define FNREAD(fn) UINT FAR DIAMONDAPI fn(int hf, void FAR *pv, UINT cb)
#define FNWRITE(fn) UINT FAR DIAMONDAPI fn(int hf, void FAR *pv, UINT cb)
#define FNCLOSE(fn) int FAR DIAMONDAPI fn(int hf)
#define FNSEEK(fn) long FAR DIAMONDAPI fn(int hf, long dist, int seektype)
/*** PFNFDIDECRYPT - FDI Decryption callback
*
* If this function is passed on the FDICopy() call, then FDI calls it
* at various times to update the decryption state and to decrypt FCDATA
* blocks.
*
* Common Entry Conditions:
* pfdid->fdidt - Command type
* pfdid->pvUser - pvUser value from FDICopy() call
*
* fdidtNEW_CABINET: //** Notification of a new cabinet
* Entry:
* pfdid->cabinet.
* pHeaderReserve - RESERVE section from CFHEADER
* cbHeaderReserve - Size of pHeaderReserve
* setID - Cabinet set ID
* iCabinet - Cabinet number in set (0 based)
* Exit-Success:
* returns anything but -1;
* Exit-Failure:
* returns -1; FDICopy() is aborted.
* Notes:
* (1) This call allows the decryption code to pick out any information
* from the cabinet header reserved area (placed there by DIACRYPT)
* needed to perform decryption. If there is no such information,
* this call would presumably be ignored.
* (2) This call is made very soon after fdintCABINET_INFO.
*
* fdidtNEW_FOLDER: //** Notification of a new folder
* Entry:
* pfdid->folder.
* pFolderReserve - RESERVE section from CFFOLDER
* cbFolderReserve - Size of pFolderReserve
* iFolder - Folder number in cabinet (0 based)
* Exit-Success:
* returns anything but -1;
* Exit-Failure:
* returns -1; FDICopy() is aborted.
* Notes:
* This call allows the decryption code to pick out any information
* from the folder reserved area (placed there by DIACRYPT) needed
* to perform decryption. If there is no such information, this
* call would presumably be ignored.
*
* fdidtDECRYPT: //** Decrypt a data buffer
* Entry:
* pfdid->folder.
* pDataReserve - RESERVE section for this CFDATA block
* cbDataReserve - Size of pDataReserve
* pbData - Data buffer
* cbData - Size of data buffer
* fSplit - TRUE if this is a split data block
* cbPartial - 0 if this is not a split block, or the first
* piece of a split block; Greater than 0 if
* this is the second piece of a split block.
* Exit-Success:
* returns TRUE;
* Exit-Failure:
* returns FALSE; error during decrypt
* returns -1; FDICopy() is aborted.
* Notes:
* FCI will split CFDATA blocks across cabinet boundaries if
* necessary. To provide maximum flexibility, FDI will call the
* fdidtDECRYPT function twice on such split blocks, once when
* the first portion is read, and again when the second portion
* is read. And, of course, most data blocks will not be split.
* So, there are three cases:
*
* 1) fSplit == FALSE
* You have the entire data block, so decrypt it.
*
* 2) fSplit == TRUE, cbPartial == 0
* This is the first portion of a split data block, so cbData
* is the size of this portion. You can either choose to decrypt
* this piece, or ignore this call and decrypt the full CFDATA
* block on the next (second) fdidtDECRYPT call.
*
* 3) fSplit == TRUE, cbPartial > 0
* This is the second portion of a split data block (indeed,
* cbPartial will have the same value as cbData did on the
* immediately preceeding fdidtDECRYPT call!). If you decrypted
* the first portion on the first call, then you can decrypt the
* second portion now. If you ignored the first call, then you
* can decrypt the entire buffer.
* NOTE: pbData points to the second portion of the split data
* block in this case, *not* the entire data block. If
* you want to wait until the second piece to decrypt the
* *entire* block, pbData-cbPartial is the address of the
* start of the whole block, and cbData+cbPartial is its
* size.
*/
typedef int (FAR DIAMONDAPI *PFNFDIDECRYPT)(PFDIDECRYPT pfdid); /* pfnfdid */
#define FNFDIDECRYPT(fn) int FAR DIAMONDAPI fn(PFDIDECRYPT pfdid)
/*** FDINOTIFICATION - Notification structure for PFNFDINOTIFY
*
* See the FDINOTIFICATIONTYPE definition for information on usage and
* meaning of these fields.
*/
typedef struct {
// long fields
long cb;
char FAR *psz1;
char FAR *psz2;
char FAR *psz3; // Points to a 256 character buffer
void FAR *pv; // Value for client
// int fields
int hf;
// short fields
USHORT date;
USHORT time;
USHORT attribs;
USHORT setID; // Cabinet set ID
USHORT iCabinet; // Cabinet number (0-based)
USHORT iFolder; // Folder number (0-based)
FDIERROR fdie;
} FDINOTIFICATION, FAR *PFDINOTIFICATION; /* fdin, pfdin */
/*** FDINOTIFICATIONTYPE - FDICopy notification types
*
* The notification function for FDICopy can be called with the following
* values for the fdint parameter. In all cases, the pfdin->pv field is
* filled in with the value of the pvUser argument passed in to FDICopy().
*
* A typical sequence of calls will be something like this:
* fdintCABINET_INFO // Info about the cabinet
* fdintENUMERATE // Starting enumeration
* fdintPARTIAL_FILE // Only if this is not the first cabinet, and
* // one or more files were continued from the
* // previous cabinet.
* ...
* fdintPARTIAL_FILE
* fdintCOPY_FILE // The first file that starts in this cabinet
* ...
* fdintCOPY_FILE // Now let's assume you want this file...
* // PFNWRITE called multiple times to write to this file.
* fdintCLOSE_FILE_INFO // File done, set date/time/attributes
*
* fdintCOPY_FILE // Now let's assume you want this file...
* // PFNWRITE called multiple times to write to this file.
* fdintNEXT_CABINET // File was continued to next cabinet!
* fdintCABINET_INFO // Info about the new cabinet
* // PFNWRITE called multiple times to write to this file.
* fdintCLOSE_FILE_INFO // File done, set date/time/attributes
* ...
* fdintENUMERATE // Ending enumeration
*
* fdintCABINET_INFO:
* Called exactly once for each cabinet opened by FDICopy(), including
* continuation cabinets opened due to file(s) spanning cabinet
* boundaries. Primarily intended to permit EXTRACT.EXE to
* automatically select the next cabinet in a cabinet sequence even if
* not copying files that span cabinet boundaries.
* Entry:
* pfdin->psz1 = name of next cabinet
* pfdin->psz2 = name of next disk
* pfdin->psz3 = cabinet path name
* pfdin->setID = cabinet set ID (a random 16-bit number)
* pfdin->iCabinet = Cabinet number within cabinet set (0-based)
* Exit-Success:
* Return anything but -1
* Exit-Failure:
* Returns -1 => Abort FDICopy() call
* Notes:
* This call is made *every* time a new cabinet is examined by
* FDICopy(). So if "foo2.cab" is examined because a file is
* continued from "foo1.cab", and then you call FDICopy() again
* on "foo2.cab", you will get *two* fdintCABINET_INFO calls all
* told.
*
* fdintCOPY_FILE:
* Called for each file that *starts* in the current cabinet, giving
* the client the opportunity to request that the file be copied or
* skipped.
* Entry:
* pfdin->psz1 = file name in cabinet
* pfdin->cb = uncompressed size of file
* pfdin->date = file date
* pfdin->time = file time
* pfdin->attribs = file attributes
* pfdin->iFolder = file's folder index
* Exit-Success:
* Return non-zero file handle for destination file; FDI writes
* data to this file use the PFNWRITE function supplied to FDICreate,
* and then calls fdintCLOSE_FILE_INFO to close the file and set
* the date, time, and attributes. NOTE: This file handle returned
* must also be closeable by the PFNCLOSE function supplied to
* FDICreate, since if an error occurs while writing to this handle,
* FDI will use the PFNCLOSE function to close the file so that the
* client may delete it.
* Exit-Failure:
* Returns 0 => Skip file, do not copy
* Returns -1 => Abort FDICopy() call
*
* fdintCLOSE_FILE_INFO:
* Called after all of the data has been written to a target file.
* This function must close the file and set the file date, time,
* and attributes.
* Entry:
* pfdin->psz1 = file name in cabinet
* pfdin->hf = file handle
* pfdin->date = file date
* pfdin->time = file time
* pfdin->attribs = file attributes
* pfdin->iFolder = file's folder index
* pfdin->cb = Run After Extract (0 - don't run, 1 Run)
* Exit-Success:
* Returns TRUE
* Exit-Failure:
* Returns FALSE, or -1 to abort;
*
* IMPORTANT NOTE IMPORTANT:
* pfdin->cb is overloaded to no longer be the size of
* the file but to be a binary indicated run or not
*
* IMPORTANT NOTE:
* FDI assumes that the target file was closed, even if this
* callback returns failure. FDI will NOT attempt to use
* the PFNCLOSE function supplied on FDICreate() to close
* the file!
*
* fdintPARTIAL_FILE:
* Called for files at the front of the cabinet that are CONTINUED
* from a previous cabinet. This callback occurs only when FDICopy is
* started on second or subsequent cabinet in a series that has files
* continued from a previous cabinet.
* Entry:
* pfdin->psz1 = file name of file CONTINUED from a PREVIOUS cabinet
* pfdin->psz2 = name of cabinet where file starts
* pfdin->psz3 = name of disk where file starts
* Exit-Success:
* Return anything other than -1; enumeration continues
* Exit-Failure:
* Returns -1 => Abort FDICopy() call
*
* fdintENUMERATE:
* Called once after a call to FDICopy() starts scanning a CAB's
* CFFILE entries, and again when there are no more CFFILE entries.
* If CAB spanning occurs, an additional call will occur after the
* first spanned file is completed. If the pfdin->iFolder value is
* changed from zero, additional calls will occur next time it reaches
* zero. If iFolder is changed to zero, FDICopy will terminate, as if
* there were no more CFFILE entries. Primarily intended to allow an
* application with it's own file list to help FDI advance quickly to
* a CFFILE entry of interest. Can also be used to allow an
* application to determine the cb values for each file in the CAB.
* Entry:
* pfdin->cb = current CFFILE position
* pfdin->iFolder = number of files remaining
* pfdin->setID = current CAB's setID value
* Exit-Don't Care:
* Don't change anything.
* Return anything but -1.
* Exit-Forcing a skip:
* pfdin->cb = desired CFFILE position
* pfdin->iFolder = desired # of files remaining
* Return anything but -1.
* Exit-Stop:
* pfdin->iFolder = set to 0
* Return anything but -1.
* Exit-Failure:
* Return -1 => Abort FDICopy call ("user aborted".)
* Notes:
* This call can be ignored by applications which want normal file
* searching. The application can adjust the supplied values to
* force FDICopy() to continue it's search at another location, or
* to force FDICopy() to terminate the search, by setting iFolder to 0.
* (FDICopy() will report no error when terminated this way.)
* FDI has no means to verify the supplied cb or iFolder values.
* Arbitrary values are likely to cause undesirable results. An
* application should cross-check pfdin->setID to be certain the
* external database is in sync with the CAB. Reverse-skips are OK
* (but may be inefficient) unless fdintNEXT_CABINET has been called.
*
* fdintNEXT_CABINET:
* This function is *only* called when fdintCOPY_FILE was told to copy
* a file in the current cabinet that is continued to a subsequent
* cabinet file. It is important that the cabinet path name (psz3)
* be validated before returning! This function should ensure that
* the cabinet exists and is readable before returning. So, this
* is the function that should, for example, issue a disk change
* prompt and make sure the cabinet file exists.
*
* When this function returns to FDI, FDI will check that the setID
* and iCabinet match the expected values for the next cabinet.
* If not, FDI will continue to call this function until the correct
* cabinet file is specified, or until this function returns -1 to
* abort the FDICopy() function. pfdin->fdie is set to
* FDIERROR_WRONG_CABINET to indicate this case.
*
* If you *haven't* ensured that the cabinet file is present and
* readable, or the cabinet file has been damaged, pfdin->fdie will
* receive other appropriate error codes:
*
* FDIERROR_CABINET_NOT_FOUND
* FDIERROR_NOT_A_CABINET
* FDIERROR_UNKNOWN_CABINET_VERSION
* FDIERROR_CORRUPT_CABINET
* FDIERROR_BAD_COMPR_TYPE
* FDIERROR_RESERVE_MISMATCH
* FDIERROR_WRONG_CABINET
*
* Entry:
* pfdin->psz1 = name of next cabinet where current file is continued
* pfdin->psz2 = name of next disk where current file is continued
* pfdin->psz3 = cabinet path name; FDI concatenates psz3 with psz1
* to produce the fully-qualified path for the cabinet
* file. The 256-byte buffer pointed at by psz3 may
* be modified, but psz1 may not!
* pfdin->fdie = FDIERROR_WRONG_CABINET if the previous call to
* fdintNEXT_CABINET specified a cabinet file that
* did not match the setID/iCabinet that was expected.
* Exit-Success:
* Return anything but -1
* Exit-Failure:
* Returns -1 => Abort FDICopy() call
* Notes:
* This call is almost always made when a target file is open and
* being written to, and the next cabinet is needed to get more
* data for the file.
*/
typedef enum {
fdintCABINET_INFO, // General information about cabinet
fdintPARTIAL_FILE, // First file in cabinet is continuation
fdintCOPY_FILE, // File to be copied
fdintCLOSE_FILE_INFO, // close the file, set relevant info
fdintNEXT_CABINET, // File continued to next cabinet
fdintENUMERATE, // Enumeration status
} FDINOTIFICATIONTYPE; /* fdint */
typedef int (FAR DIAMONDAPI *PFNFDINOTIFY)(FDINOTIFICATIONTYPE fdint,
PFDINOTIFICATION pfdin); /* pfnfdin */
#define FNFDINOTIFY(fn) int FAR DIAMONDAPI fn(FDINOTIFICATIONTYPE fdint, \
PFDINOTIFICATION pfdin)
/*** cpuType values for FDICreate()
*
* (Ignored by 32-bit FDI.)
*/
#define cpuUNKNOWN (-1) /* FDI does detection */
#define cpu80286 (0) /* '286 opcodes only */
#define cpu80386 (1) /* '386 opcodes used */
/*** FDICreate - Create an FDI context
*
* Entry:
* pfnalloc
* pfnfree
* pfnopen
* pfnread
* pfnwrite
* pfnclose
* pfnlseek
* cpuType - Select CPU type (auto-detect, 286, or 386+)
* NOTE: For the 32-bit FDI.LIB, this parameter is ignored!
* perf
*
* Exit-Success:
* Returns non-NULL FDI context handle.
*
* Exit-Failure:
* Returns NULL; perf filled in with error code
*
*/
HFDI FAR DIAMONDAPI FDICreate(PFNALLOC pfnalloc,
PFNFREE pfnfree,
PFNOPEN pfnopen,
PFNREAD pfnread,
PFNWRITE pfnwrite,
PFNCLOSE pfnclose,
PFNSEEK pfnseek,
int cpuType,
PERF perf);
/*** FDIIsCabinet - Determines if file is a cabinet, returns info if it is
*
* Entry:
* hfdi - Handle to FDI context (created by FDICreate())
* hf - File handle suitable for PFNREAD/PFNSEEK, positioned
* at offset 0 in the file to test.
* pfdici - Buffer to receive info about cabinet if it is one.
*
* Exit-Success:
* Returns TRUE; file is a cabinet, pfdici filled in.
*
* Exit-Failure:
* Returns FALSE, file is not a cabinet; If an error occurred,
* perf (passed on FDICreate call!) filled in with error.
*/
BOOL FAR DIAMONDAPI FDIIsCabinet(HFDI hfdi,
int hf,
PFDICABINETINFO pfdici);
/*** FDICopy - extracts files from a cabinet
*
* Entry:
* hfdi - handle to FDI context (created by FDICreate())
* pszCabinet - main name of cabinet file
* pszCabPath - Path to cabinet file(s)
* flags - Flags to modify behavior
* pfnfdin - Notification function
* pfnfdid - Decryption function (pass NULL if not used)
* pvUser - User specified value to pass to notification function
*
* Exit-Success:
* Returns TRUE;
*
* Exit-Failure:
* Returns FALSE, perf (passed on FDICreate call!) filled in with
* error.
*
* Notes:
* (1) If FDICopy() fails while a target file is being written out, then
* FDI will use the PFNCLOSE function to close the file handle for that
* target file that was returned from the fdintCOPY_FILE notification.
* The client application is then free to delete the target file, since
* it will not be in a valid state (since there was an error while
* writing it out).
*/
BOOL FAR DIAMONDAPI FDICopy(HFDI hfdi,
char FAR *pszCabinet,
char FAR *pszCabPath,
int flags,
PFNFDINOTIFY pfnfdin,
PFNFDIDECRYPT pfnfdid,
void FAR *pvUser);
/*** FDIDestroy - Destroy an FDI context
*
* Entry:
* hfdi - handle to FDI context (created by FDICreate())
*
* Exit-Success:
* Returns TRUE;
*
* Exit-Failure:
* Returns FALSE;
*/
BOOL FAR DIAMONDAPI FDIDestroy(HFDI hfdi);
//** Revert to default structure packing
#pragma pack()
#endif // !INCLUDED_FDI
#ifdef __cplusplus
}
#endif