771 lines
22 KiB
C++
771 lines
22 KiB
C++
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//
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// CMPOBJ.CPP
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//
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// Source file for ArchiveLib 2.0
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//
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// Copyright (c) Greenleaf Software, Inc. 1994-1996
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// All Rights Reserved
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//
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// CONTENTS
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//
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// ALCompressedObject::operator new()
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// ALCompressedObject::ALCompressedObject()
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// newALCompressed()
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// ALCompressedObject::~ALCompressedObject()
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// deleteALCompressed()
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// ALCompressedObject::Insert()
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// ALCompressedInsert()
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// ALCompressedObject::Extract()
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// ALCompressedExtract()
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// ALCompressedObject::WriteHeaderData()
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// ALCompressedObject::ReadHeaderData()
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//
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// DESCRIPTION
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//
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// This file contains all the support code for the ALCompressedObject
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// class. This class is sort of a poor-man's archive, with just one
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// file, no flexibility, and super-low overhead.
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//
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// REVISION HISTORY
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//
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// May 23, 1994 1.0A : First release
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//
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// August 10, 1994 1.0B : Modified the ALCompressedObject class just a bit
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// to make it somewhat more useful. First, the
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// ReadHeaderData() and WriteHeaderData()
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// functions now get called with a pointer to
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// their target storage object. Second, modified the
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// extract function so that it calls ReadHeaderData()
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// real early in the process. One of the reasons
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// for these changes was to allow a compressed
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// object that can save the last letter of the
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// original file when compressed, and restore
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// it when extracting. So you can compress
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// BOB.DAT to BOB.DA_. When you restore BOB.DA_,
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// a derived class can automatically set the
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// output file name to be BOB.DAT.
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//
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// February 14, 1996 2.0A : New release
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#include "arclib.h"
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#if !defined( AL_IBM )
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#pragma hdrstop
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#endif
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#include "_openf.h"
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//
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// NAME
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//
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// ALCompressedObject::operator new()
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//
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// PLATFORMS/ENVIRONMENTS
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//
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// Windows
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// C++
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//
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// SHORT DESCRIPTION
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//
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// Memory allocation operator needed with DLL.
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//
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// C++ SYNOPSIS
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//
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// #include "arclib.h"
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// #include "cmpobj.h"
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//
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// void * ALCompressedObject::operator new( size_t size )
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//
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// C SYNOPSIS
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//
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// None.
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//
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// VB SYNOPSIS
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//
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// None.
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//
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// DELPHI SYNOPSIS
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//
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// None.
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//
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// ARGUMENTS
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//
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// size : The number of bytes needed to create a new ALCompressedObject.
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//
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// DESCRIPTION
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//
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// When using a DLL, it is easy to create a dangerous situation when
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// creating objects whose ctor and dtor are both in the DLL. The problem
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// arises because when you create an object using new, the memory for
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// the object will be allocated from the EXE. However, when you destroy
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// the object using delete, the memory is freed inside the DLL. Since
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// the DLL doesn't really own that memory, bad things can happen.
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//
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// But, you say, won't the space just go back to the Windows heap regardless
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// of who tries to free it? Maybe, but maybe not. If the DLL is using
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// a subsegment allocation scheme, it might do some sort of local free
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// before returning the space to the windows heap. That is the point where
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// you could conceivably cook your heap.
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//
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// By providing our own version of operator new inside this class, we
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// ensure that all memory allocation for the class will be done from
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// inside the DLL, not the EXE calling the DLL.
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//
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// RETURNS
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//
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// A pointer to the newly allocated storage area, or 0 if no storage
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// was available.
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//
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// EXAMPLE
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//
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// None.
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//
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// SEE ALSO
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//
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// REVISION HISTORY
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//
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// May 23, 1994 1.0A : First release
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//
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// February 14, 1996 2.0A : New release
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#if defined( AL_BUILDING_DLL )
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void AL_DLL_FAR * AL_PROTO
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ALCompressedObject::operator new( size_t size ) /* Tag internal function */
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{
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return ::new char[ size ];
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}
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#endif
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//
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// NAME
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//
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// ALCompressedObject::ALCompressedObject()
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//
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// PLATFORMS/ENVIRONMENTS
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//
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// Console Windows PM
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// C++ C VB Delphi
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//
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// SHORT DESCRIPTION
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//
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// Create a new CompressedObject.
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//
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// C++ SYNOPSIS
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//
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// #include "arclib.h"
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// #include "cmpobj.h"
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//
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// ALCompressedObject::ALCompressedObject( ALStorage &storage_object,
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// ALCompressor *compressor,
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// ALDecompressor *decompressor );
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//
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// C SYNOPSIS
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//
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// #include "arclib.h"
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// #include "cmpobj.h"
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//
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// hALCompressed newALCompressed( hALStorage storage,
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// hALCompressor compressor,
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// hALDecompressor decompressor );
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//
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// VB SYNOPSIS
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//
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// Declare Function newALCompressed Lib "AL20LW"
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// (ByVal storage&, ByVal compressor&, ByVal decompressor&) As Long
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//
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// DELPHI SYNOPSIS
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//
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// function newALCompressed( storage : hALStorage;
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// compressor : hALCompressor,
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// decompressor : hALDecompressor ) : hALCompressed;
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//
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// ARGUMENTS
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//
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// storage_object : A reference to the storage object that is going
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// to get the compressed data.
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//
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// compressor : A reference to the compression engine that will
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// be used to insert an object a storage object into
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// the compressed object. If you are only going to
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// be extracting, feel free to use a 0 for this argument.
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//
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// decompressor : A reference to the decompression engine that will
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// be used to extract an object a storage object from
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// the compressed object. If you are only going to
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// be inserting, feel free to use a 0 for this argument.
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//
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//
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// DESCRIPTION
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//
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// An ALCompressedObject is a storage object that gets a single compressed
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// object packed into it. You get to call Insert() or Extract(), to
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// put the object in or take it out. Compressed objects don't get all
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// the fancy options that Archives do. For example, you have to know in
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// advance what sort of compression engine and storage object you are
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// going to use to put things in and take things out. You don't get to
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// store comments or time date stamps, or anything like that.
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//
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// The one piece of flexibility you do get the ALCompressedObject is
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// the ability to derive a new class from this base, then use the
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// new class to write some custom data out to the object.
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//
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// This constructor stores references to the object being used to hold the
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// compressed data, and the engines being used to pack and unpack it.
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//
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// RETURNS
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//
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// For C++, nothing, this is a constructor. For the other languages,
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// a handle pointing to the compressed object.
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//
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// EXAMPLE
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//
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// SEE ALSO
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//
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// REVISION HISTORY
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//
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// November 13, 1995 2.00A : First release.
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//
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// February 14, 1996 2.0A : New release
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AL_PROTO
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ALCompressedObject::ALCompressedObject( /* Tag public function */
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ALStorage AL_DLL_FAR & storage_object,
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ALCompressor AL_DLL_FAR * compressor,
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ALDecompressor AL_DLL_FAR * decompressor )
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{
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mpCompressor = compressor;
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mpDecompressor = decompressor;
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mpStorageObject = &storage_object;
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}
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#if !defined( AL_NO_C )
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extern "C" AL_LINKAGE hALCompressed AL_FUNCTION
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newALCompressed( hALStorage storage, /* Tag public function */
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hALCompressor compressor,
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hALDecompressor decompressor )
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{
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AL_ASSERT_OBJECT( storage, ALStorage, "newALCompressed" );
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if ( compressor )
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AL_ASSERT_OBJECT( compressor, ALCompressor, "newALCompressed" );
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if ( decompressor )
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AL_ASSERT_OBJECT( decompressor, ALDecompressor, "newALCompressed" );
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return (hALCompressed)
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new ALCompressedObject( *(ALStorage *) storage,
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(ALCompressor *) compressor,
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(ALDecompressor *) decompressor );
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}
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#endif
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//
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// NAME
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//
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// ALCompressedObject::~ALCompressedObject()
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//
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// PLATFORMS/ENVIRONMENTS
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//
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// Console Windows PM
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// C++ C VB Delphi
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//
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// SHORT DESCRIPTION
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//
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// Reset the error status for an entry list.
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//
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// C++ SYNOPSIS
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//
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// #include "arclib.h"
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// #include "cmpobj.h"
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//
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// ALCompressedObject::~ALCompressedObject()
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//
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// C SYNOPSIS
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//
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// #include "arclib.h"
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// #include "cmpobj.h"
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//
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// void deleteALCompressed( hALCompressed this_object );
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//
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// VB SYNOPSIS
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//
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// Declare Sub deleteALCompressed Lib "AL120LW" (ByVal this_object&)
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//
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// DELPHI SYNOPSIS
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//
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// procedure deleteALCompressed( this_object : hALCompressed );
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//
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// ARGUMENTS
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//
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// this_object : A reference or pointer to the ALCompressedObject that
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// is going to be destroyed. Note that the C++ version
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// version of this call doesn't have an explicit argument
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// here, since it has access to 'this' implicitly.
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//
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// DESCRIPTION
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//
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// This destructor has nothing important to do. The debug version
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// checks the object type for validity, but that's it.
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//
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// RETURNS
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//
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// Nothing.
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//
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// EXAMPLE
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//
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// SEE ALSO
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//
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// REVISION HISTORY
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|
|
//
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// November 13, 1995 2.00A : First release.
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//
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// February 14, 1996 2.0A : New release
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AL_PROTO
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ALCompressedObject::~ALCompressedObject() /* Tag public function */
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{
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AL_ASSERT_OBJECT( this, ALCompressedObject, "~ALCompressedObject" );
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}
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#if !defined( AL_NO_C )
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extern "C" AL_LINKAGE void AL_FUNCTION
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deleteALCompressed( hALCompressed this_object ) /* Tag public function */
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{
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AL_ASSERT_OBJECT( this_object, ALCompressedObject, "deleteALCompressed" );
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delete (ALCompressedObject *) this_object;
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}
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#endif
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//
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// NAME
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//
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// ALCompressedObject::Insert()
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//
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// PLATFORMS/ENVIRONMENTS
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//
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||
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// Console Windows PM
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|
|
// C++ C VB Delphi
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//
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// SHORT DESCRIPTION
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//
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// Insert a storage object into an ALCompressedObject.
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//
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// C++ SYNOPSIS
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//
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// #include "arclib.h"
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// #include "cmpobj.h"
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//
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// int ALCompressedObject::Insert( ALStorage &input_object )
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//
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// C SYNOPSIS
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//
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// #include "arclib.h"
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// #include "cmpobj.h"
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//
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// int ALCompressedInsert( hALCompressed this_object,
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// hALStorage input_object );
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//
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// VB SYNOPSIS
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//
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// Declare Function ALCompressedInsert Lib "AL20LW"
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// (ByVal this_object&, ByVal input_object&) As Integer
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//
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// DELPHI SYNOPSIS
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//
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// function ALCompressedInsert( this_object : hALCompressed;
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// input_object : hALStorage ) : Integer;
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//
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// ARGUMENTS
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//
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// this_object : A reference or pointer to the ALCompressedObject that
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// is going to have an object inserted into it. Note that
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// the C++ version of this call doesn't have an explicit
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// this_object argument, since it has access to 'this'
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// implicitly.
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//
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// input_object : A pointer or reference to the storage object that is
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// going to be inserted into the compressed object.
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//
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// DESCRIPTION
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||
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//
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||
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// The compressed object has this format:
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//
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// long uncompressed_size
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// long compressed_size
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// DWORD crc_32
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// Any data from derived classes
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|
|
// unsigned char compressed_object[]
|
||
|
|
//
|
||
|
|
// Writing all this out is pretty straightforward, although you might
|
||
|
|
// note that it is going to require at least one seek() back to the
|
||
|
|
// start of the compressed object after the compression is done.
|
||
|
|
//
|
||
|
|
// RETURNS
|
||
|
|
//
|
||
|
|
// AL_SUCCESS if everything worked properly, or < AL_SUCCESS if an
|
||
|
|
// error was encountered.
|
||
|
|
//
|
||
|
|
// EXAMPLE
|
||
|
|
//
|
||
|
|
// SEE ALSO
|
||
|
|
//
|
||
|
|
// REVISION HISTORY
|
||
|
|
//
|
||
|
|
// November 13, 1995 2.00A : First release.
|
||
|
|
//
|
||
|
|
|
||
|
|
int AL_PROTO
|
||
|
|
ALCompressedObject::Insert( ALStorage AL_DLL_FAR &input_object ) /* Tag public function */
|
||
|
|
{
|
||
|
|
AL_ASSERT_OBJECT( this, ALCompressedObject, "Insert" );
|
||
|
|
AL_ASSERT_OBJECT( &input_object, ALStorage, "Insert" );
|
||
|
|
if ( mStatus < AL_SUCCESS )
|
||
|
|
return mStatus;
|
||
|
|
//
|
||
|
|
// Here is where we open the input and the output.
|
||
|
|
//
|
||
|
|
ALOpenFiles files( input_object, *mpStorageObject );
|
||
|
|
//
|
||
|
|
// We first write out the uncompressed size, which we already know. We
|
||
|
|
// then save the current position, and write placeholder longs out for
|
||
|
|
// what will become the compressed size and the CRC-32.
|
||
|
|
//
|
||
|
|
mpStorageObject->WriteGlLong( input_object.GetSize() );
|
||
|
|
long saved_pos = mpStorageObject->Tell();
|
||
|
|
mpStorageObject->WriteGlLong( 0xfedcba98L ); //Temporary
|
||
|
|
mpStorageObject->WriteGlLong( 0x01234567L ); //Temporary
|
||
|
|
//
|
||
|
|
// If a derived class has any header data to write out, this is where it
|
||
|
|
// will be performed. The base class writes 0 bytes here.
|
||
|
|
//
|
||
|
|
WriteHeaderData( &input_object );
|
||
|
|
long start = mpStorageObject->Tell();
|
||
|
|
//
|
||
|
|
// Next, perform the compression. Once that is done we can calculate
|
||
|
|
// the compressed size. The CRC-32 will have been calculated on the fly
|
||
|
|
// as the compression was performed.
|
||
|
|
//
|
||
|
|
mpCompressor->Compress( input_object, *mpStorageObject );
|
||
|
|
long compressed_size = mpStorageObject->Tell() - start;
|
||
|
|
if ( mpCompressor->mStatus < 0 )
|
||
|
|
return mStatus = mpCompressor->mStatus;
|
||
|
|
//
|
||
|
|
// Go back to the spot we remembered, and write out the compressed
|
||
|
|
// size and the CRC. At that point, the compressed object is complete.
|
||
|
|
//
|
||
|
|
mpStorageObject->Seek( saved_pos );
|
||
|
|
mpStorageObject->WriteGlLong( compressed_size );
|
||
|
|
mpStorageObject->WriteGlLong( ~input_object.GetCrc32() );
|
||
|
|
if ( mpStorageObject->mStatus < 0 )
|
||
|
|
return mStatus = mpStorageObject->mStatus;
|
||
|
|
return AL_SUCCESS;
|
||
|
|
}
|
||
|
|
|
||
|
|
#if !defined( AL_NO_C )
|
||
|
|
|
||
|
|
extern "C" AL_LINKAGE int AL_FUNCTION
|
||
|
|
ALCompressedInsert( hALCompressed this_object, /* Tag public function */
|
||
|
|
hALStorage input_object )
|
||
|
|
{
|
||
|
|
AL_ASSERT_OBJECT( this_object, ALCompressedObject, "ALCompressedInsert" );
|
||
|
|
AL_ASSERT_OBJECT( input_object, ALStorage, "ALCompressedInsert" );
|
||
|
|
return ( (ALCompressedObject *) this_object )->Insert( * (ALStorage *) input_object );
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
//
|
||
|
|
// NAME
|
||
|
|
//
|
||
|
|
// ALCompressedObject::Extract()
|
||
|
|
//
|
||
|
|
// PLATFORMS/ENVIRONMENTS
|
||
|
|
//
|
||
|
|
// Console Windows PM
|
||
|
|
// C++ C VB Delphi
|
||
|
|
//
|
||
|
|
// SHORT DESCRIPTION
|
||
|
|
//
|
||
|
|
// Extract a storage object from an ALCompressedObject.
|
||
|
|
//
|
||
|
|
// C++ SYNOPSIS
|
||
|
|
//
|
||
|
|
// #include "arclib.h"
|
||
|
|
// #include "cmpobj.h"
|
||
|
|
//
|
||
|
|
// int ALCompressedObject::Extract( ALStorage &input_object )
|
||
|
|
//
|
||
|
|
// C SYNOPSIS
|
||
|
|
//
|
||
|
|
// #include "arclib.h"
|
||
|
|
// #include "cmpobj.h"
|
||
|
|
//
|
||
|
|
// int ALCompressedExtract( hALCompressed this_object,
|
||
|
|
// hALStorage output_object );
|
||
|
|
//
|
||
|
|
// VB SYNOPSIS
|
||
|
|
//
|
||
|
|
// Declare Function ALCompressedExtract Lib "AL20LW"
|
||
|
|
// (ByVal this_object&, ByVal output_object&) As Integer
|
||
|
|
//
|
||
|
|
// DELPHI SYNOPSIS
|
||
|
|
//
|
||
|
|
// function ALCompressedExtract( this_object : hALCompressed;
|
||
|
|
// output_object : hALStorage ) : Integer;
|
||
|
|
//
|
||
|
|
// ARGUMENTS
|
||
|
|
//
|
||
|
|
// this_object : A reference or pointer to the ALCompressedObject that
|
||
|
|
// contains the compressed object. Note that
|
||
|
|
// the C++ version of this call doesn't have an explicit
|
||
|
|
// this_object argument, since it has access to 'this'
|
||
|
|
// implicitly.
|
||
|
|
//
|
||
|
|
// output_object : A reference or pointer to the ALStorage object that
|
||
|
|
// is going receive the extracted storage object.
|
||
|
|
//
|
||
|
|
//
|
||
|
|
// DESCRIPTION
|
||
|
|
//
|
||
|
|
// Extracting the data to a new storage object is easy. We read in
|
||
|
|
// all the header data so that we can do a little error checking along the
|
||
|
|
// way, but that's all.
|
||
|
|
//
|
||
|
|
// RETURNS
|
||
|
|
//
|
||
|
|
// AL_SUCCESS if everything worked properly, or < AL_SUCCESS if an
|
||
|
|
// error was encountered.
|
||
|
|
//
|
||
|
|
// EXAMPLE
|
||
|
|
//
|
||
|
|
// SEE ALSO
|
||
|
|
//
|
||
|
|
// REVISION HISTORY
|
||
|
|
//
|
||
|
|
// November 13, 1995 2.00A : First release.
|
||
|
|
//
|
||
|
|
// February 14, 1996 2.0A : New release
|
||
|
|
|
||
|
|
int AL_PROTO
|
||
|
|
ALCompressedObject::Extract( ALStorage AL_DLL_FAR &output_object ) /* Tag public function */
|
||
|
|
{
|
||
|
|
long compressed_length;
|
||
|
|
long crc32;
|
||
|
|
|
||
|
|
AL_ASSERT_OBJECT( this, ALCompressedObject, "Extract" );
|
||
|
|
AL_ASSERT_OBJECT( &output_object, ALStorage, "Extract" );
|
||
|
|
if ( mStatus < AL_SUCCESS )
|
||
|
|
return mStatus;
|
||
|
|
//
|
||
|
|
// Open the input file.
|
||
|
|
//
|
||
|
|
ALOpenInputFile input_file( *mpStorageObject );
|
||
|
|
//
|
||
|
|
// Now read in all the data stored at the start of the object,
|
||
|
|
// including any header data created by derived classes. If we are
|
||
|
|
// using the base class, there won't be any additional data bytes there.
|
||
|
|
//
|
||
|
|
mpStorageObject->ReadGlLong( output_object.mlSize );
|
||
|
|
mpStorageObject->ReadGlLong( compressed_length );
|
||
|
|
mpStorageObject->ReadGlLong( crc32 );
|
||
|
|
ReadHeaderData( &output_object );
|
||
|
|
if ( mpStorageObject->mStatus < 0 )
|
||
|
|
return mStatus = mpStorageObject->mStatus;
|
||
|
|
//
|
||
|
|
// Open the output file.
|
||
|
|
//
|
||
|
|
ALOpenOutputFile output_file( output_object );
|
||
|
|
//
|
||
|
|
// Extract the data and store it in the storage object specified
|
||
|
|
// as an argument.
|
||
|
|
//
|
||
|
|
if ( mpDecompressor->Decompress( *mpStorageObject,
|
||
|
|
output_object,
|
||
|
|
compressed_length ) < 0 )
|
||
|
|
return mStatus = mpDecompressor->mStatus;
|
||
|
|
//
|
||
|
|
// A little error checking leads to an error return if things didn't
|
||
|
|
// go well, or AL_SUCCESS if things did.
|
||
|
|
//
|
||
|
|
if ( mpStorageObject->mStatus < 0 )
|
||
|
|
return mStatus = mpStorageObject->mStatus;
|
||
|
|
if ( crc32 != ~output_object.GetCrc32() )
|
||
|
|
return mStatus.SetError( AL_CRC_ERROR,
|
||
|
|
"CRC32 differs between %s and %s",
|
||
|
|
mpStorageObject->mName.GetName(),
|
||
|
|
output_object.mName.GetName() );
|
||
|
|
return AL_SUCCESS;
|
||
|
|
}
|
||
|
|
|
||
|
|
#if !defined( AL_NO_C )
|
||
|
|
|
||
|
|
extern "C" AL_LINKAGE int AL_FUNCTION
|
||
|
|
ALCompressedExtract( hALCompressed this_object, /* Tag public function */
|
||
|
|
hALStorage output_object )
|
||
|
|
{
|
||
|
|
AL_ASSERT_OBJECT( this_object, ALCompressedObject, "ALCompressedExtract" );
|
||
|
|
AL_ASSERT_OBJECT( output_object, ALStorage, "ALCompressedExtract" );
|
||
|
|
return ( (ALCompressedObject *) this_object )->Extract( * (ALStorage *) output_object );
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif
|
||
|
|
|
||
|
|
|
||
|
|
//
|
||
|
|
// NAME
|
||
|
|
//
|
||
|
|
// ALCompressedObject::WriteHeaderData();
|
||
|
|
//
|
||
|
|
// PLATFORMS/ENVIRONMENTS
|
||
|
|
//
|
||
|
|
// Console Windows PM
|
||
|
|
// C++
|
||
|
|
//
|
||
|
|
// SHORT DESCRIPTION
|
||
|
|
//
|
||
|
|
// Write customized data to an ALCompressedObject.
|
||
|
|
//
|
||
|
|
// C++ SYNOPSIS
|
||
|
|
//
|
||
|
|
// #include "arclib.h"
|
||
|
|
// #include "cmpobj.h"
|
||
|
|
//
|
||
|
|
// int ALCompressedObject::WriteHeaderData( ALStorage * storage /* = 0 */ )
|
||
|
|
//
|
||
|
|
// C SYNOPSIS
|
||
|
|
//
|
||
|
|
// None.
|
||
|
|
//
|
||
|
|
// VB SYNOPSIS
|
||
|
|
//
|
||
|
|
// None.
|
||
|
|
//
|
||
|
|
// DELPHI SYNOPSIS
|
||
|
|
//
|
||
|
|
// None.
|
||
|
|
//
|
||
|
|
// ARGUMENTS
|
||
|
|
//
|
||
|
|
// storage : A pointer to the storage object that is going to be inserted
|
||
|
|
// into the ALCompressed object. Be sure not to confuse this
|
||
|
|
// with mpStorageObject, which is the member that points to the
|
||
|
|
// storage object that's going to hold the compressed data.
|
||
|
|
//
|
||
|
|
// DESCRIPTION
|
||
|
|
//
|
||
|
|
// Derived classes can override this function and use it to add
|
||
|
|
// additional data bytes to the header of a compressed object. Note
|
||
|
|
// that this data does not have to be written out in any particular
|
||
|
|
// format, we have no portability concerns here. It is up to the
|
||
|
|
// derived class to insure that the data is written in an internally
|
||
|
|
// consistent format so that ReadHeaderData() can always position the
|
||
|
|
// file pointer to the correct start of data.
|
||
|
|
//
|
||
|
|
// This function shows the default version of WriteHeaderData, and it does
|
||
|
|
// absolutely nothing.
|
||
|
|
//
|
||
|
|
// RETURNS
|
||
|
|
//
|
||
|
|
// An integer containing an ArchiveLib status code, hopefully this
|
||
|
|
// will be AL_SUCCESS. Write now, the Insert() member function doesn't
|
||
|
|
// pay attention to the return code, so it really doesn't matter what
|
||
|
|
// you put here.
|
||
|
|
//
|
||
|
|
// EXAMPLE
|
||
|
|
//
|
||
|
|
// SEE ALSO
|
||
|
|
//
|
||
|
|
// REVISION HISTORY
|
||
|
|
//
|
||
|
|
// November 13, 1995 2.00A : First release.
|
||
|
|
//
|
||
|
|
// February 14, 1996 2.0A : New release
|
||
|
|
|
||
|
|
|
||
|
|
int AL_PROTO
|
||
|
|
ALCompressedObject::WriteHeaderData( ALStorage AL_DLL_FAR * /* = 0 */ ) /* Tag protected function */
|
||
|
|
{
|
||
|
|
return AL_SUCCESS;
|
||
|
|
}
|
||
|
|
|
||
|
|
//
|
||
|
|
// NAME
|
||
|
|
//
|
||
|
|
// ALCompressedObject::ReadHeaderData();
|
||
|
|
//
|
||
|
|
// PLATFORMS/ENVIRONMENTS
|
||
|
|
//
|
||
|
|
// Console Windows PM
|
||
|
|
// C++
|
||
|
|
//
|
||
|
|
// SHORT DESCRIPTION
|
||
|
|
//
|
||
|
|
// Read customized data from an ALCompressedObject.
|
||
|
|
//
|
||
|
|
// C++ SYNOPSIS
|
||
|
|
//
|
||
|
|
// #include "arclib.h"
|
||
|
|
// #include "cmpobj.h"
|
||
|
|
//
|
||
|
|
// int ALCompressedObject::ReadHeaderData( ALStorage * storage /* = 0 */ )
|
||
|
|
//
|
||
|
|
// C SYNOPSIS
|
||
|
|
//
|
||
|
|
// None.
|
||
|
|
//
|
||
|
|
// VB SYNOPSIS
|
||
|
|
//
|
||
|
|
// None.
|
||
|
|
//
|
||
|
|
// DELPHI SYNOPSIS
|
||
|
|
//
|
||
|
|
// None.
|
||
|
|
//
|
||
|
|
// ARGUMENTS
|
||
|
|
//
|
||
|
|
// storage : A pointer to the storage object that is going to receive the
|
||
|
|
// object extracted from the ALCompressedObject. Be sure not to
|
||
|
|
// confuse this with mpStorageObject, which is the member that
|
||
|
|
// points to the storage object that's holding the compressed
|
||
|
|
// data.
|
||
|
|
//
|
||
|
|
// DESCRIPTION
|
||
|
|
//
|
||
|
|
// Derived classes can override this function and use it to read
|
||
|
|
// additional data bytes from the header of a compressed object. Note
|
||
|
|
// that this data does not have to be written out in any particular
|
||
|
|
// format, we have no portability concerns here. It is up to the
|
||
|
|
// derived class to insure that the data is written in an internally
|
||
|
|
// consistent format so that the Extract() function can always position the
|
||
|
|
// file pointer to the correct start of data.
|
||
|
|
//
|
||
|
|
// This function shows the default version of ReadHeaderData, and it does
|
||
|
|
// absolutely nothing.
|
||
|
|
//
|
||
|
|
// RETURNS
|
||
|
|
//
|
||
|
|
// An integer containing an ArchiveLib status code, hopefully this
|
||
|
|
// will be AL_SUCCESS. Write now, the Extract() member function doesn't
|
||
|
|
// pay attention to the return code, so it really doesn't matter what
|
||
|
|
// you put here.
|
||
|
|
//
|
||
|
|
// EXAMPLE
|
||
|
|
//
|
||
|
|
// SEE ALSO
|
||
|
|
//
|
||
|
|
// REVISION HISTORY
|
||
|
|
//
|
||
|
|
// November 13, 1995 2.00A : First release.
|
||
|
|
//
|
||
|
|
// February 14, 1996 2.0A : New release
|
||
|
|
|
||
|
|
|
||
|
|
int AL_PROTO
|
||
|
|
ALCompressedObject::ReadHeaderData( ALStorage AL_DLL_FAR * /* = 0 */ ) /* Tag protected function */
|
||
|
|
{
|
||
|
|
return AL_SUCCESS;
|
||
|
|
}
|