Unit Fdi |
++ f d i . p a s Copyright (c) 1997 Alexander Staubo, all rights reserved. Abstract: Translation of fdi.h, part of the Cabinet SDK. Revision history: 06/07/1997 20:17 alexs 1.0 Autogenerated by htrans 26/12/1997 02:55 alexs 1.1 Fixed declarations of function callbacks, other minor stuff --
Classes |
Functions |
CompressionLevelFromTCOMP -
CompressionMemoryFromTCOMP -
CompressionTypeFromTCOMP -
FDICopy - 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.
FDICreate - 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.
FDIDestroy - FDIDestroy - Destroy an FDI context
*
* Entry:
* hfdi - handle to FDI context (created by FDICreate())
*
* Exit-Success:
* Returns TRUE;
*
* Exit-Failure:
* Returns FALSE;
FDIIsCabinet - 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.
LZXCompressionWindowFromTCOMP -
TCOMPfromLZXWindow -
TCOMPfromTypeLevelMemory -
Types |
HFDI
PERF
PFDIDECRYPT
PFDINOTIFICATION
PFNALLOC
PFNCLOSE
PFNFDIDECRYPT
PFNFDINOTIFY
PFNFREE
PFNOPEN
PFNREAD
PFNSEEK
PFNWRITE
PVoid
TBYTE
TCHECKSUM
TCOFF
TCOMP
TERF
TFDICABINETINFO
TFDIDECRYPT
TFDIDECRYPTTYPE
TFDIERROR
TFDINOTIFICATION
TFDINOTIFICATIONTYPE
TFNALLOC_dummy
TFNCLOSE_dummy
TFNFDIDECRYPT_dummy
TFNFDINOTIFY_dummy
TFNFREE_dummy
TFNOPEN_dummy
TFNREAD_dummy
TFNSEEK_dummy
TFNWRITE_dummy
TPFDICABINETINFO
TUINT
TULONG
TUOFF
TUSHORT
USHORT
Constants |
CB_MAX_CABINET_NAME
CB_MAX_CAB_PATH
CB_MAX_CHUNK
CB_MAX_DISK
CB_MAX_DISK_NAME
CB_MAX_FILENAME
cpu80286
cpu80386
cpuUNKNOWN
tcompBAD
tcompLZX_WINDOW_HI
tcompLZX_WINDOW_LO
tcompMASK_LZX_WINDOW
tcompMASK_QUANTUM_LEVEL
tcompMASK_QUANTUM_MEM
tcompMASK_RESERVED
tcompMASK_TYPE
tcompQUANTUM_LEVEL_HI
tcompQUANTUM_LEVEL_LO
tcompQUANTUM_MEM_HI
tcompQUANTUM_MEM_LO
tcompSHIFT_LZX_WINDOW
tcompSHIFT_QUANTUM_LEVEL
tcompSHIFT_QUANTUM_MEM
tcompTYPE_LZX
tcompTYPE_MSZIP
tcompTYPE_NONE
tcompTYPE_QUANTUM
_A_EXEC
_A_NAME_IS_UTF
Variables |
Functions |
Types |
HFDI = PVoidHFDI - Handle to an FDI context * * FDICreate() creates this, and it must be passed to all other FDI * functions.
PERF = ^TERFerf
PFDIDECRYPT = ^TFDIDECRYPTfdid
PFDINOTIFICATION = ^TFDINOTIFICATION
PFNALLOC = TFNALLOC_dummy
PFNCLOSE = TFNCLOSE_dummy
PFNFDIDECRYPT = TFNFDIDECRYPT_dummy
PFNFDINOTIFY = TFNFDINOTIFY_dummy
PFNFREE = TFNFREE_dummy
PFNOPEN = TFNOPEN_dummy
PFNREAD = TFNREAD_dummy
PFNSEEK = TFNSEEK_dummy
PFNWRITE = TFNWRITE_dummy
PVoid = Pointer
TBYTE = Charf
TCHECKSUM = Longintul
TCOFF = Longintuoff - uncompressed offset
TCOMP = SmallinttcompXXX - 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.
TERF = recordcoff - cabinet file offset } {** ERF - Error structure * * This structure returns error information from FCI/FDI. The caller should * not modify this structure.
erfOper : Integer;
erfType : Integer;
fError : BOOL;
end;
TFDICABINETINFO = recordhfdi } {** FDICABINETINFO - Information about a cabinet *
cbCabinet : Longint;
cFolders : TUSHORT;
cFiles : TUSHORT;
setID : TUSHORT;
iCabinet : TUSHORT;
fReserve : BOOL;
hasprev : BOOL;
hasnext : BOOL;
end;
TFDIDECRYPT = recordfdidt } {** FDIDECRYPT - Data for PFNFDIDECRYPT function *
fdidt : TFDIDECRYPTTYPE;
pvUser : PVoid;
end;
TFDIDECRYPTTYPE = ( fdidtNEW_CABINET // New cabinet , fdidtNEW_FOLDER // New folder , fdidtDECRYPT // Decrypt a data block );pfdici } {** FDIDECRYPTTYPE - PFNFDIDECRYPT command types *
TFDIERROR = ( 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. );* 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 * [#125] * FDIDestroy(hfdi); * ... * [#125] * * // 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 * ... * [#125] * * 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. *) {** 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.
TFDINOTIFICATION = recordpfnfdid } {** FDINOTIFICATION - Notification structure for PFNFDINOTIFY * * See the FDINOTIFICATIONTYPE definition for information on usage and * meaning of these fields.
cb : Longint;
psz1 : PChar;
psz2 : PChar;
psz3 : PChar;
pv : PVoid;
hf : Integer;
date : TUSHORT;
time : TUSHORT;
attribs : TUSHORT;
setID : TUSHORT;
iCabinet : TUSHORT;
iFolder : TUSHORT;
fdie : TFDIERROR;
end;
TFDINOTIFICATIONTYPE = ( 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 );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.
TFNALLOC_dummy = function (cb : TULONG) : PVoidpfdid } {** 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
TFNCLOSE_dummy = function (hf : Integer) : Integer
TFNFDIDECRYPT_dummy = function (pfdid : PFDIDECRYPT) : IntegerPFNFDIDECRYPT - 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.
TFNFDINOTIFY_dummy = function (fdint : TFDINOTIFICATIONTYPE; pfdin : PFDINOTIFICATION) : Integerfdint
TFNFREE_dummy = function (pv : PVoid) : Pointerpfna
TFNOPEN_dummy = function (pszFile : PChar; oflag : Integer; pmode : Integer) : Integerpfnf } {** 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
TFNREAD_dummy = function (hf : Integer; pv : PVoid; cb : TUINT) : TUINT
TFNSEEK_dummy = function (hf : Integer; dist : Longint; seektype : Integer) : Longint
TFNWRITE_dummy = function (hf : Integer; pv : PVoid; cb : TUINT) : TUINT
TPFDICABINETINFO = ^TFDICABINETINFOfdici
TUINT = Integerb
TULONG = Longintus
TUOFF = Longintcsum
TUSHORT = Smallintui
USHORT = Word
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