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206 lines
4.9 KiB
C
206 lines
4.9 KiB
C
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/*
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vfdfat.c
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Virtual Floppy Drive for Windows
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Driver control library
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Formats the image with FAT12
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Copyright (C) 2003-2005 Ken Kato
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*/
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#ifdef __cplusplus
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#pragma message(__FILE__": Compiled as C++ for testing purpose.")
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#endif // __cplusplus
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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#include "vfdtypes.h"
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#include "vfdio.h"
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#include "vfdlib.h"
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#include "vfdver.h"
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#pragma pack(1)
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//
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// BIOS parameter block
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//
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typedef struct _DOS_BPB
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{
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USHORT BytesPerSector;
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UCHAR SectorsPerCluster;
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USHORT ReservedSectors;
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UCHAR NumberOfFATs;
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USHORT RootEntries;
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USHORT SmallSectors;
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UCHAR MediaDescriptor;
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USHORT SectorsPerFAT;
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USHORT SectorsPerTrack;
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USHORT NumberOfHeads;
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ULONG HiddenSectors;
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ULONG LargeSectors;
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}
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DOS_BPB, *PDOS_BPB;
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//
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// Extended BIOS parameter block for FAT12/16/HUGE
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//
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typedef struct _EXBPB
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{
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UCHAR PhysicalDriveNumber;
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UCHAR Reserved;
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UCHAR BootSignature;
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ULONG VolumeSerialNumber;
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CHAR VolumeLabel[11];
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CHAR FileSystemType[8];
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}
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EXBPB, *PEXBPB;
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//
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// Partition Boot Record
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//
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typedef struct _DOS_PBR { // Partition Boot Record
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UCHAR jump[3]; // Jump Instruction (E9 or EB, xx, 90)
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CHAR oemid[8]; // OEM ID (OS type)
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DOS_BPB bpb; // BIOS parameter block
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EXBPB exbpb; // Extended BIOS parameter block
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}
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DOS_PBR, *PDOS_PBR;
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#pragma pack()
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#define FAT_DIR_ENTRY_SIZE 32
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// We need to have the 0xeb and 0x90 in the jump code
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// because the file system recognizer checks these values
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#define VFD_JUMP_CODE "\xeb\x3c\x90"
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#define VFD_OEM_NAME "VFD" VFD_DRIVER_VERSION_STR " "
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#define VFD_VOLUME_LABEL "NO NAME "
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#define VFD_FILESYSTEM "FAT12 "
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//
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// Select DOS BPB parameters from media size
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//
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static const DOS_BPB *SelectDosBpb(
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USHORT nSectors)
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{
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static const DOS_BPB bpb_tbl[] = {
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// b/s s/c r fat root sec desc s/f s/t h
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{VFD_BYTES_PER_SECTOR, 2, 1, 2, 112, 320, 0xFE, 1, 8, 1, 0, 0}, // 160KB 5.25"
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{VFD_BYTES_PER_SECTOR, 2, 1, 2, 112, 360, 0xFC, 1, 9, 1, 0, 0}, // 180KB 5.25"
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{VFD_BYTES_PER_SECTOR, 2, 1, 2, 112, 640, 0xFF, 1, 8, 2, 0, 0}, // 320KB 5.25"
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{VFD_BYTES_PER_SECTOR, 2, 1, 2, 112, 720, 0xFD, 2, 9, 2, 0, 0}, // 360KB 5.25"
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{VFD_BYTES_PER_SECTOR, 2, 1, 2, 112, 1280, 0xFB, 2, 8, 2, 0, 0}, // 640KB 5.25" / 3.5"
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{VFD_BYTES_PER_SECTOR, 2, 1, 2, 112, 1440, 0xF9, 3, 9, 2, 0, 0}, // 720KB 5.25" / 3.5"
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{VFD_BYTES_PER_SECTOR, 2, 1, 2, 112, 1640, 0xF9, 3, 10, 2, 0, 0}, // 820KB 3.5"
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{VFD_BYTES_PER_SECTOR, 1, 1, 2, 224, 2400, 0xF9, 7, 15, 2, 0, 0}, // 1.20MB 5.25" / 3.5"
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{VFD_BYTES_PER_SECTOR, 1, 1, 2, 224, 2880, 0xF0, 9, 18, 2, 0, 0}, // 1.44MB 3.5"
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{VFD_BYTES_PER_SECTOR, 1, 1, 2, 224, 3360, 0xF0, 10, 21, 2, 0, 0}, // 1.68MB 3.5"
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{VFD_BYTES_PER_SECTOR, 1, 1, 2, 224, 3444, 0xF0, 10, 21, 2, 0, 0}, // 1.72MB 3.5"
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{VFD_BYTES_PER_SECTOR, 2, 1, 2, 240, 5760, 0xF0, 9, 36, 2, 0, 0}, // 2.88MB 3.5"
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};
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int i;
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for (i = 0; i < sizeof(bpb_tbl) / sizeof(bpb_tbl[0]); i++) {
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if (nSectors == bpb_tbl[i].SmallSectors) {
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return &bpb_tbl[i];
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}
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}
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return NULL;
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}
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//
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// Format the buffer with FAT12
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//
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DWORD FormatBufferFat(
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PUCHAR pBuffer,
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ULONG nSectors)
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{
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const DOS_BPB *bpb; // BIOS Parameter Block
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PDOS_PBR pbr; // Partition Boot Record
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PUCHAR fat; // File Allocation Table
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USHORT idx;
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VFDTRACE(0,
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("[VFD] VfdFormatImage - IN\n"));
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//
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// Select DOS BPB parameters from media size
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//
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bpb = SelectDosBpb((USHORT)nSectors);
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if (!bpb) {
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VFDTRACE(0,
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("[VFD] Unsupported media size %lu\n",
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nSectors));
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return ERROR_INVALID_PARAMETER;
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}
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//
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// Initialize the whole area with the fill data
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//
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FillMemory(pBuffer,
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VFD_SECTOR_TO_BYTE(nSectors),
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VFD_FORMAT_FILL_DATA);
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//
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// Make up the FAT boot record
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//
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ZeroMemory(pBuffer, VFD_BYTES_PER_SECTOR);
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pbr = (PDOS_PBR)pBuffer;
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CopyMemory(pbr->jump, VFD_JUMP_CODE, sizeof(pbr->jump));
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CopyMemory(pbr->oemid, VFD_OEM_NAME, sizeof(pbr->oemid));
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CopyMemory(&pbr->bpb, bpb, sizeof(pbr->bpb));
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// Make up the extended BPB
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pbr->exbpb.BootSignature = 0x29;
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// use the tick count as the volume serial number
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pbr->exbpb.VolumeSerialNumber = GetTickCount();
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CopyMemory(pbr->exbpb.VolumeLabel,
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VFD_VOLUME_LABEL, sizeof(pbr->exbpb.VolumeLabel));
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CopyMemory(pbr->exbpb.FileSystemType,
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VFD_FILESYSTEM, sizeof(pbr->exbpb.FileSystemType));
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// Set the boot record signature
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*(pBuffer + VFD_BYTES_PER_SECTOR - 2) = 0x55;
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*(pBuffer + VFD_BYTES_PER_SECTOR - 1) = 0xaa;
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//
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// Clear FAT areas
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//
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fat = pBuffer + VFD_SECTOR_TO_BYTE(bpb->ReservedSectors);
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ZeroMemory(
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fat,
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VFD_SECTOR_TO_BYTE(bpb->SectorsPerFAT * bpb->NumberOfFATs));
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//
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// Make up FAT entries for the root directory
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//
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for (idx = 0; idx < bpb->NumberOfFATs; idx++) {
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*fat = bpb->MediaDescriptor;
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*(fat + 1) = 0xff;
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*(fat + 2) = 0xff;
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fat += VFD_SECTOR_TO_BYTE(bpb->SectorsPerFAT);
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}
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//
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// Clear root directory entries
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//
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ZeroMemory(fat, bpb->RootEntries * FAT_DIR_ENTRY_SIZE);
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VFDTRACE(0,
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("[VFD] VfdFormatImage - OUT\n"));
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return ERROR_SUCCESS;
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}
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