123 lines
3.5 KiB
C
123 lines
3.5 KiB
C
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//////////////////////////////////////////////////////////////////////////////
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//
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// fatdevice.h - implementation of BootDevice class for Fat16/32 volumes
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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#ifndef __FATDEVICE_H__
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#define __FATDEVICE_H__
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#include "singldr.h"
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#include "bootdevice.h"
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//////////////////////////////////////////////////////////////////////////////
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//
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// Linked-in Functions (not declared in any headers)
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// from singldr0.asm
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extern "C" uint16 __cdecl
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BiosDiskRead(uint8 __far * addr,
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uint32 diskblock,
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uint16 blocks,
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uint16 driveid);
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extern "C" uint16 __cdecl
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PModeTransfer(uint32 StartAddress,
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uint32 DestinationAddress,
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uint32 bytes);
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//////////////////////////////////////////////////////////////////////////////
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//
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// Declaration for class FatDevice
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#pragma pack(4)
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struct __near FatDevice : BootDevice
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{
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private:
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// disk characteristics
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uint8 BootDrive;
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// partition characteristics
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uint32 LBAStart;
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uint32 LBASize;
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// Fat characteristics (read from boot sector, same for all FAT types)
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uint16 BytesPerSec;
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uint8 SecsPerClus;
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uint16 RsvdSecs;
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uint8 NumFats;
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uint16 RootDirEntries;
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uint32 HiddenSecs;
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// Fat characteristics (location in boot sector differs by FAT type)
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uint32 TotalSecs;
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uint32 NumFatSecs;
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// Fat characteristics (computed)
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uint16 RootDirSecs;
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uint32 TotalDataSecs;
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uint32 ClusterCount;
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uint8 FatType;
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uint32 RootStartClus; // for fat32
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uint32 RootStartSec; // for fat16
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uint32 FirstDataSec;
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uint32 BytesPerClus;
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uint32 DirEntriesPerClus;
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uint32 EndOfClusterMarker;
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uint32 BadClusterMarker;
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uint8 FatOffsetMultiplier;
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// data buffers -- these are reused frequently. Be careful
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// about what you assume is in them.
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uint8 __far * MbrBuffer;
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uint8 __far * FatBuffer;
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uint8 __far * FileBuffer;
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uint32 __near CalcNextCluster(uint32 currentCluster) __far;
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void __near ReadCluster(uint32 ClusterNum, uint8 __far * buffer) __far;
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int __near DirLookup(LPCHAR filename,
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uint8 len,
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FilePtr directory,
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FilePtr file,
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int Fat16RootDir) __far;
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public:
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// constructor
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FatDevice(uint8 driveId, uint8 expectedType) __far
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{
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// set the boot drive and expected type
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this->BootDrive = driveId;
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this->FatType = expectedType;
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// since this is global, define it as part of constructing the object
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// for maximum compatibility, we just allocate it and leave it
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// null (alloc zeros it)
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this->CmdLine = (uint16 __far *)alloc(2048, 2);
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}
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// implement the virtual functions from the base class
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int __near OpenDevice() __far;
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int __near CloseDevice() __far;
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int __near GetFileProperties(LPCHAR filename,
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FilePtr file,
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FilePtr directory) __far;
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INT16 __near ReadFileLow(LPCHAR filename,
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FilePtr file,
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uint8 __far * buffer) __far;
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UINT32 __near ReadFileHigh(LPCHAR filename,
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FilePtr file,
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uint32 buffer,
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uint32 cbBuffer) __far;
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};
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#pragma pack()
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#endif
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