407 lines
17 KiB
C
407 lines
17 KiB
C
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//+-------------------------------------------------------------------------
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//
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// Microsoft Windows
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//
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// Copyright (C) Microsoft Corporation, 1997 - 1999
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//
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// File: cabinet.h
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//
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//--------------------------------------------------------------------------
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/*** cabinet.h - Definitions for Cabinet File structure
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*
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* Author:
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* Benjamin W. Slivka
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*
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* History:
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* 15-Aug-1993 bens Initial version
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* 05-Sep-1993 bens Added Overview section
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* 29-Nov-1993 chuckst Added disk names to folder first & next
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* Used "CF" consistently
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* Eliminated redundant cch fields
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* 09-Feb-1994 chuckst merged in some related global constants
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* 09-Mar-1994 bens Add RESERVE defintions (for encryption)
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* 17-Mar-1994 bens Improve comments about split CFDATA structures
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* 25-Mar-1994 bens Add cabinet set ID
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* 13-May-1994 bens Define bad value for iCabinet
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* 15-Jun-1997 pberkman added CABSignatureStruct_
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*
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* Overview:
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* This file contains definitions for the Diamond Cabinet File format.
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* A Cabinet File exists to store one or more files. Usually these
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* files have been compressed, but that is not required. It is also
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* possible for a cabinet file to contain only a portion of a larger
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* file.
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*
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* In designing this format, the following goals where achieved:
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* 1) Minimize overhead in the CF format
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* ==> Where ever possible BYTEs or USHORTs were used, rather
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* than using LONGs, even though the latter would be easier
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* to manipulate on certain RISC platforms.
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* 2) Support little-endian and big-endian byte ordering.
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* ==> For simplicity on x86 systems, multi-byte numbers are
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* stored in a little-endian form, but the code to read and
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* write these numbers operates correctly on either type of
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* computer.
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*
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* A cabinet file contains the following structures in the following
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* order:
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* Name Description
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* ----------- -------------------
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* CFHEADER Cabinet description
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* [CFRESERVE] Optional RESERVED control information in CFHEADER
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* CFFOLDER(s) Folder descriptions
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* [reserved] Optional RESERVED data per folder
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* CFFILE(s) File descriptions
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* CFDATA(s) Data blocks
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* [reserved] Optional RESERVED data per data block
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*
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* Data Integrity Strategy:
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* The Cabinet File has built-in data integrity checks, since it is
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* possible for customers to have damaged diskettes, or for accidental
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* or malicious damage to occur. Rather than doing an individual
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* checksum for the entire cabinet file (which would have a dramatic
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* impact on the speed of installation from floppy disk, since the
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* entire file would need to be read), we have per-component
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* checksums, and compute and check them as we read the various
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* components of the file.
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*
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* 1) Checksum CFHEADER
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* 2) Store cabinet file length in CFHEADER (to detect file truncation)
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* 3) Checksum entire set of CFFOLDER structures
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* 4) Checksum entire set of CFFILE structures
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* 5) Checksum each (compressed) data block independantly
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*
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* This approach allows us to avoid reading unnecessary parts of the
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* file cabinet (though reading all of CFFOLDER and CFFILE structures
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* would otherwise not be required in all cases), while still providing
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* adequate integrity checking.
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*/
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#ifndef INCLUDED_CABINET
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#define INCLUDED_CABINET 1
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typedef unsigned long CHECKSUM;
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typedef unsigned long COFF;
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typedef unsigned long UOFF;
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//** Pack structures tightly in cabinet files!
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#pragma pack(1)
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/*** verCF - Cabinet File format version
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*
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* The low-order byte is interpreted as a decimal number for the minor
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* (1/100ths) portion of the version number.
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* The high-order byte is interpreted as a decimal number for the major
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* portion of the version number.
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*
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* Examples:
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* 0x0000 0.00
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* 0x010A 1.10
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* 0x0410 4.16
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*
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* History:
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* 1.01 Original
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* 1.02 Added flags field, changed signature
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* 1.03 Added setId,iCabinet so FDI can ensure correct cabinet
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* on continuation.
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*/
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#define verCF 0x0103 // CF version 1.03
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/*** Various cabinet file limits
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*
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*/
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#define cMAX_FOLDERS_PER_CABINET (ifoldMASK-1)
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#define cMAX_FILES_PER_CABINET 65535
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/*** cbRESERVE_XXX_MAX - Maximum size of RESERVE sections
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*
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* NOTE: cbRESERVE_HEADER_MAX is a fair bit less than 64K because in
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* the 16-bit version of this code, we want to have a USHORT
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* variable that holds the size of the CFHEADER structure +
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* the size of the CFRESERVE structure + the size of the per-header
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* reserved data.
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*/
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#define cbRESERVE_HEADER_MAX 60000 // Fits in a USHORT
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#define cbRESERVE_FOLDER_MAX 255 // Fits in a BYTE
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#define cbRESERVE_DATA_MAX 255 // Fits in a BYTE
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/*** ifoldXXXX - Special values for CFFILE.iFolder
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*
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*/
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#define ifoldMASK 0xFFFC // Low two bits zero
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#define ifoldCONTINUED_FROM_PREV 0xFFFD
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#define ifoldCONTINUED_TO_NEXT 0xFFFE
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#define ifoldCONTINUED_PREV_AND_NEXT 0xFFFF
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#define IS_CONTD_FORWARD(ifold) ((ifold & 0xfffe) == ifoldCONTINUED_TO_NEXT)
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#define IS_CONTD_BACK(ifold) ((ifold & 0xfffd) == ifoldCONTINUED_FROM_PREV)
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#ifndef MAKESIG
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/*** MAKESIG - Construct a 4 byte signature
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*
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* Entry:
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* ch1,ch2,ch3,ch4 - four characters
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*
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* Exit:
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* returns unsigned long
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*/
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#define MAKESIG(ch1,ch2,ch3,ch4) \
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( ((unsigned long)ch1) + \
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(((unsigned long)ch2)<< 8) + \
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(((unsigned long)ch3)<<16) + \
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(((unsigned long)ch4)<<24) )
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#endif // !MAKESIG
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#define sigCFHEADER MAKESIG('M','S','C','F') // CFHEADER signature
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/*** cfhdrXXX - bit flags for cfheader.flags field
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*
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*/
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#define cfhdrPREV_CABINET 0x0001 // Set if previous cab/disk present
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#define cfhdrNEXT_CABINET 0x0002 // Set if next cab/disk present
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#define cfhdrRESERVE_PRESENT 0x0004 // Set if RESERVE_CONTROL is present
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/*** CFHEADER - Cabinet File Header
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*
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*/
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typedef struct {
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//** LONGs are first, to ensure alignment
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long sig; // Cabinet File identification string
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CHECKSUM csumHeader; // Structure checksum (excluding csumHeader!)
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long cbCabinet; // Total length of file (consistency check)
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CHECKSUM csumFolders; // Checksum of CFFOLDER list
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COFF coffFiles; // Location in cabinet file of CFFILE list
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CHECKSUM csumFiles; // Checksum of CFFILE list
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//** SHORTs are next, to ensure alignment
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USHORT version; // Cabinet File version (verCF)
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USHORT cFolders; // Count of folders (CFIFOLDERs) in cabinet
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USHORT cFiles; // Count of files (CFIFILEs) in cabinet
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USHORT flags; // Flags to indicate optional data presence
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USHORT setID; // Cabinet set ID (identifies set of cabinets)
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USHORT iCabinet; // Cabinet number in set (0 based)
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#define iCABINET_BAD 0xFFFF // Illegal number for iCabinet
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//** If flags has the cfhdrRESERVE_PRESENT bit set, then a CFRESERVE
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// structure appears here, followed possibly by some CFHEADER reserved
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// space. The CFRESERVE structure has fields to define how much reserved
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// space is present in the CFHEADER, CFFOLDER, and CFDATA structures.
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// If CFRESERVE.cbCFHeader is non-zero, then abReserve[] immediately
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// follows the CFRESERVE structure. Note that all of these sizes are
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// multiples of 4 bytes, to ensure structure alignment!
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//
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// CFRESERVE cfres; // Reserve information
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// BYTE abReserve[]; // Reserved data space
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//
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//** The following fields presence depends upon the settings in the flags
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// field above. If cfhdrPREV_CABINET is set, then there are two ASCIIZ
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// strings to describe the previous disk and cabinet.
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//
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// NOTE: This "previous" cabinet is not necessarily the immediately
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// preceding cabinet! While it usually will be, if a file is
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// continued into the current cabinet, then the "previous"
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// cabinet identifies the cabinet where the folder that contains
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// this file *starts*! For example, if EXCEL.EXE starts in
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// cabinet excel.1 and is continued through excel.2 to excel.3,
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// then cabinet excel.3 will point back to *cabinet.1*, since
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// that is where you have to start in order to extract EXCEL.EXE.
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//
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// char szCabinetPrev[]; // Prev Cabinet filespec
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// char szDiskPrev[]; // Prev descriptive disk name
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//
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// Similarly, If cfhdrNEXT_CABINET is set, then there are two ASCIIZ
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// strings to describe the next disk and cabinet:
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//
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// char szCabinetNext[]; // Next Cabinet filespec
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// char szDiskNext[]; // Next descriptive disk name
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//
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} CFHEADER; /* cfheader */
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/*** CFRESERVE - Cabinet File Reserved data information
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*
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* This structure is present in the middle of the CFHEADER structure if
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* CFHEADER.flags has the cfhdrRESERVE_PRESENT bit set. This structure
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* defines the sizes of all the reserved data sections in the CFHEADER,
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* CFFOLDER, and CFDATA structures.
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*
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* These reserved sizes can be zero (although it would be strange to have
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* all of them be zero), but otherwise must be a multiple of 4, to ensure
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* structure alignment for RISC machines.
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*/
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typedef struct {
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USHORT cbCFHeader; // Size of abReserve in CFHEADER structure
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BYTE cbCFFolder; // Size of abReserve in CFFOLDER structure
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BYTE cbCFData; // Size of abReserve in CFDATA structure
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} CFRESERVE; /* cfreserve */
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#define cbCF_HEADER_BAD 0xFFFF // Bad value for CFRESERVE.cbCFHeader
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//
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// the following struct identifies the content of the signature area
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// of abReserved for Athenticode version 2.
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//
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typedef struct CABSignatureStruct_
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{
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DWORD cbFileOffset;
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DWORD cbSig;
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BYTE Filler[8];
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} CABSignatureStruct_;
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/*** CFFOLDER - Cabinet Folder
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*
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* This structure describes a partial or complete "compression unit".
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* A folder is by definition a stream of compressed data. To retrieve
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* an uncompressed data from a folder, you *must* start decompressing
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* the data at the start of the folder, regardless of how far into the
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* folder the data you want actually starts.
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*
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* Folders may start in one cabinet, and continue on to one or more
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* succeeding cabinets. In general, if a folder has been continued over
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* a cabinet boundary, Diamond/FCI will terminate that folder as soon as
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* the current file has been completely compressed. Generally this means
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* that a folder would span at most two cabinets, but if the file is really
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* large, it could span more than two cabinets.
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*
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* Note: CFFOLDERs actually refer to folder *fragments*, not necessarily
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* complete folders. You know that a CFFOLDER is the beginning of a
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* folder (as opposed to a continuation in a subsequent cabinet file)
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* if a file starts in it (i.e., the CFFILE.uoffFolderStart field is
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* 0).
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*/
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typedef struct {
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COFF coffCabStart; // Offset in cabinet file of first CFDATA
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// block for this folder.
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USHORT cCFData; // Count of CFDATAs for this folder that
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// are actually in this cabinet. Note that
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// a folder can continue into another cabinet
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// and have many more CFDATA blocks in that
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// cabinet, *and* a folder may have started
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// in a previous cabinet. This count is
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// only of CFDATAs for this folder that are
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// (at least partially) in this cabinet.
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short typeCompress; // Indicates compression type for all CFDATA
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// blocks for this folder. The valid values
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// are defined in the types.h built into
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// fci.h/fdi.h.
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//** If CFHEADER.flags has the cfhdrRESERVE_PRESENT bit set, and
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// CFRESERVE.cbCFFolder is non-zero, then abReserve[] appears here.
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//
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// BYTE abReserve[]; // Reserved data space
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//
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} CFFOLDER; /* cffolder */
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/*** CFFILE - Cabinet File structure describing a single file in the cabinet
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*
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* NOTE: iFolder is used to indicatate continuation cases, so we have to
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* calculate the real iFolder by examining the cabinet files:
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*
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* ifoldCONTINUED_FROM_PREV
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* This file ends in this cabinet, but is continued from a
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* previous cabinet. Therefore, the portion of the file contained
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* in *this* cabinet *must* start in the first folder.
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*
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* NOTE: szCabinetPrev is the name of the cabinet where this file
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* *starts*, which is not necessarily the immediately
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* preceeding cabinet! Since it only makes sense to
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* decompress a file from its start, the starting cabinet
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* is what is important!
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*
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* ifoldCONTINUED_TO_NEXT
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* This file starts in this cabinet, but is continued to the next
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* cabinet. Therfore, this file must start in the *last* folder
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* in this cabinet.
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*
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* ifoldCONTINUED_PREV_AND_NEXT
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* This file is the *middle* portion of a file that started in a
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* previous cabinet and is continued in the next cabinet. Since
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* this cabinet only contain this piece of a single file, there
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* is only a single folder fragment in this cabinet.
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*/
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typedef struct {
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long cbFile; // Uncompressed size of file
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UOFF uoffFolderStart; // Offset in folder IN UNCOMPRESSED BYTES
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// of the start of this file
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USHORT iFolder; // Index of folder containing this file;
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// 0 is first folder in this cabinet.
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// See ifoldCONTINUED_XXXX values above
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// for treatment of continuation files.
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USHORT date; // Date stamp in FAT file system format
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USHORT time; // Time stamp in FAT file system format
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USHORT attribs; // Attribute in FAT file system format
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// char szName[]; // File name (may include path characters)
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} CFFILE; /* cffile */
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|
/*** CFDATA - Cabinet File structure describing a data block
|
||
|
|
*
|
||
|
|
*/
|
||
|
|
typedef struct {
|
||
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|
CHECKSUM csum; // Checksum (excluding this field itself!)
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||
|
|
// of this structure and the data that
|
||
|
|
// follows. If this CFDATA structure is
|
||
|
|
// continued to the next cabinet, then
|
||
|
|
// the value of this field is ignored
|
||
|
|
// (and set to zero).
|
||
|
|
|
||
|
|
USHORT cbData; // Size of ab[] data that resides in the
|
||
|
|
// current cabinet. A CFDATA may be split
|
||
|
|
// across a cabinet boundary, so this
|
||
|
|
// value indicates only the amount of data
|
||
|
|
// store in this cabinet.
|
||
|
|
|
||
|
|
USHORT cbUncomp; // Uncompressed size of ab[] data; if this
|
||
|
|
// CFDATA block is continued to the next
|
||
|
|
// cabinet, then this value is zero!
|
||
|
|
// If this CFDATA block the remainder of
|
||
|
|
// of a CFDATA block that started in the
|
||
|
|
// previous cabinet, then this value is
|
||
|
|
// the total size of the uncompressed data
|
||
|
|
// represented by the two CFDATA blocks!
|
||
|
|
|
||
|
|
//** If CFHEADER.flags has the cfhdrRESERVE_PRESENT bit set, and
|
||
|
|
// CFRESERVE.cbCFData is non-zero, then abReserve[] appears here.
|
||
|
|
//
|
||
|
|
// BYTE abReserve[]; // Reserved data space
|
||
|
|
//
|
||
|
|
|
||
|
|
//** The actual data follows here, cbData bytes in length.
|
||
|
|
//
|
||
|
|
// BYTE ab[]; // Data
|
||
|
|
//
|
||
|
|
} CFDATA; /* cfdata */
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
//** Attribute Bit to use for Run after extract
|
||
|
|
#define RUNATTRIB 0x40
|
||
|
|
|
||
|
|
|
||
|
|
//** Revert to default structure packing!
|
||
|
|
#pragma pack()
|
||
|
|
|
||
|
|
#endif // !INCLUDED_CABINET
|