124 lines
4.1 KiB
C
124 lines
4.1 KiB
C
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//////////////////////////////////////////////////////////////////////////////
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//
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// usbdevice.h - implementation of BootDevice class for Usb Fat16 volumes
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//
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// Copyright (c) Microsoft Corporation. All rights reserved.
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//
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// NB - this is very similar to the Fat code (it started with copy/paste)
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// However, since Fat32 and Partitions are completely unsupported,
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// and since Int13 extensions are not supported, this differs enough
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// to warrant its own implementation, even if the two implementations
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// are quite similar.
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#ifndef __USBDEVICE_H__
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#define __USBDEVICE_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 BiosDiskReadCHS(uint8 __far * addr, uint32 diskblock, uint16 driveid, uint16 sectors, uint16 secpertrack, uint16 numheads);
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extern "C" uint16 __cdecl PModeTransfer(uint32 StartAddress, uint32 DestinationAddress, uint32 bytes);
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// from fatdevice.cpp
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int FatShortNameMatch(uint8 __far * buffer, LPCHAR filename);
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int FatLongNamePartialMatch(uint8 __far * buffer, LPCHAR filename, uint8 signature, uint8 checksum);
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uint8 FatChecksum(uint8 __far * buffer);
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//////////////////////////////////////////////////////////////////////////////
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//
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// Declaration for class UsbDevice
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#pragma pack(4)
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struct __near UsbDevice : 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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// Fat characteristics (read from boot sector)
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uint16 BytesPerSec;
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uint8 SecsPerClus;
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uint16 SecsPerTrack;
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uint16 NumHeads;
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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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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 RootStartSec;
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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 * BootSectorBuffer;
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uint8 __far * FatBuffer;
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uint8 __far * FileBuffer;
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// Search the Fat for the cluster that follows the current one
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uint32 __near CalcNextCluster(uint32 currentCluster) __far;
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// read a cluster into a buffer
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void __near ReadCluster(uint32 ClusterNum, uint8 __far * buffer) __far;
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// Directory Lookup
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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 -- Hack alert - the complier claims that:
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// "2 overloads have similar conversions" when the second
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// parameter isn't given.
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UsbDevice(uint8 driveId, uint8 /* nullParam */) __far{
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// set private fields based on params
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this->BootDrive = driveId;
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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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