private static void DeleteFile(string fileName, FileStream fStream, FAT12_BOOT_SECTOR bootSector, FAT12_MOUNT_INFO mountInfo)
{
byte[] buf = new byte[512];
FAT12_FILE_ENTRY fat12FileEntry;
/* Get 8.3 directory name */
char[] DosFileName = new char[12];
ToDosFileName(fileName, ref DosFileName);
DosFileName[11] = '\0';
/* 16 entries per sector, 14 sectors total */
for (int sector = 0; sector < 14; sector++)
{
/* Read in sector */
fStream.Seek((mountInfo.rootOffset + sector) * 512, SeekOrigin.Begin);
fStream.Read(buf, 0, 512);
/* Get file info */
GCHandle pinnedBuf = GCHandle.Alloc(buf, GCHandleType.Pinned);
int count = 0;
unsafe
{
fat12FileEntry = (FAT12_FILE_ENTRY)Marshal.PtrToStructure(pinnedBuf.AddrOfPinnedObject() + (count * sizeof(FAT12_FILE_ENTRY)), typeof(FAT12_FILE_ENTRY));
}
for (int i = 0; i < 16; i++)
{
/* Get current filename */
char[] name = new char[12];
unsafe
{
for (int j = 0; j < 11; j++)
name[j] = (char)fat12FileEntry.Filename[j];
}
name[11] = '\0';
/* Find a match? */
if (String.Compare(String.Concat(DosFileName), String.Concat(name)) == 0)
{
FreeClusterChain(fat12FileEntry.FirstCluster, fStream);
unsafe
{
fat12FileEntry.Filename[0] = 0xE5;
fStream.Seek((mountInfo.rootOffset + sector) * 512 + (count * sizeof(FAT12_FILE_ENTRY)), SeekOrigin.Begin);
Marshal.StructureToPtr(fat12FileEntry, pinnedBuf.AddrOfPinnedObject(), true);
fStream.Write(buf, 0, sizeof(FAT12_FILE_ENTRY));
}
return;
}
count++;
unsafe
{
fat12FileEntry = (FAT12_FILE_ENTRY)Marshal.PtrToStructure(pinnedBuf.AddrOfPinnedObject() + (count * sizeof(FAT12_FILE_ENTRY)), typeof(FAT12_FILE_ENTRY));
}
}
pinnedBuf.Free();
}
return;
}
private static FAT12_FILE_ENTRY? OpenSubDirectory(string fileName, FileStream fStream, FAT12_MOUNT_INFO mountInfo, FAT12_FILE_ENTRY? curFile)
{
byte[] buf = new byte[512];
FAT12_FILE_ENTRY fat12FileEntry;
/* Get 8.3 directory name */
char[] DosFileName = new char[12];
ToDosFileName(fileName, ref DosFileName);
DosFileName[11] = '\0';
/* 16 entries per sector, 14 sectors total */
for (int sector = 0; sector < 14; sector++)
{
/* Read in sector */
fStream.Seek(mountInfo.rootOffset + sector, SeekOrigin.Begin);
fStream.Read(buf, 0, 512);
/* Get file info */
GCHandle pinnedBuf = GCHandle.Alloc(buf, GCHandleType.Pinned);
int count = 0;
unsafe
{
fat12FileEntry = (FAT12_FILE_ENTRY)Marshal.PtrToStructure(pinnedBuf.AddrOfPinnedObject() + (count * sizeof(FAT12_FILE_ENTRY)), typeof(FAT12_FILE_ENTRY));
}
for (int i = 0; i < 16; i++)
{
/* Get current filename */
char[] name = new char[12];
unsafe
{
for (int j = 0; j < 11; j++)
name[j] = (char)fat12FileEntry.Filename[j];
}
name[11] = '\0';
/* Find a match? */
if (String.Compare(DosFileName.ToString(), name.ToString()) == 0)
{
/* Found it, set up file info */
/* strcpy(file.name, DirectoryName); */
/* file.currentCluster = directory->FirstCluster; */
return fat12FileEntry;
}
count++;
unsafe
{
fat12FileEntry = (FAT12_FILE_ENTRY)Marshal.PtrToStructure(pinnedBuf.AddrOfPinnedObject() + (count * sizeof(FAT12_FILE_ENTRY)), typeof(FAT12_FILE_ENTRY));
}
}
pinnedBuf.Free();
}
return null;
}
static void SaveFileToDiskImage(string fileName, FileStream fStream, FAT12_BOOT_SECTOR bootSector, FAT12_MOUNT_INFO mountInfo)
{
/* First delete the file if it exists */
DeleteFile(fileName, fStream, bootSector, mountInfo);
byte[] buf = new byte[512];
FAT12_FILE_ENTRY fat12FileEntry;
/* Get 8.3 directory name */
char[] DosFileName = new char[12];
ToDosFileName(fileName, ref DosFileName);
DosFileName[11] = '\0';
/* 16 entries per sector, 14 sectors total */
for (int sector = 0; sector < 14; sector++)
{
/* Read in sector */
fStream.Seek((mountInfo.rootOffset + sector) * 512, SeekOrigin.Begin);
fStream.Read(buf, 0, 512);
/* Get file info */
GCHandle pinnedBuf = GCHandle.Alloc(buf, GCHandleType.Pinned);
int count = 0;
unsafe
{
fat12FileEntry = (FAT12_FILE_ENTRY)Marshal.PtrToStructure(pinnedBuf.AddrOfPinnedObject() + (count * sizeof(FAT12_FILE_ENTRY)), typeof(FAT12_FILE_ENTRY));
}
for (int i = 0; i < 16; i++)
{
/* I'm looking for an entry beginning with \0 or 0xE5 */
unsafe
{
if (fat12FileEntry.Filename[0] == '\0' || fat12FileEntry.Filename[0] == 0xE5)
{
/* Found a blank file entry */
for (int j = 0; j < 8; j++)
fat12FileEntry.Filename[j] = (byte)DosFileName[j];
for (int j = 0; j < 3; j++)
fat12FileEntry.Ext[j] = (byte)DosFileName[j + 8];
fat12FileEntry.Attrib = 0;
/* TODO: Set the date and times */
fat12FileEntry.DateCreated = 0;
fat12FileEntry.DateLastAccessed = 0;
fat12FileEntry.LastModDate = 0;
fat12FileEntry.LastModTime = 0;
fat12FileEntry.TimeCreated = 0;
fat12FileEntry.TimeCreatedMs = 0;
fat12FileEntry.FileSize = 0;
fat12FileEntry.FirstCluster = GetFirstFreeCluster(fStream, 2);
UInt16 currentCluster = fat12FileEntry.FirstCluster;
FileStream inputFile = new FileStream(fileName, FileMode.Open);
byte[] inputBuffer = new byte[512];
int readBytes = 0;
while ((readBytes = inputFile.Read(inputBuffer, 0, 512)) > 0)
{
fat12FileEntry.FileSize += (uint)readBytes;
fStream.Seek((31 + currentCluster) * 512, SeekOrigin.Begin);
fStream.Write(inputBuffer, 0, readBytes);
if (fStream.Length > fat12FileEntry.FileSize)
{ /* Allocate next block */
UInt16 nextBlock = GetFirstFreeCluster(fStream, (UInt16)(currentCluster + 1));
MarkBlockChain(fStream, currentCluster, nextBlock);
currentCluster = nextBlock;
}
}
MarkBlockChain(fStream, currentCluster, 0xFFF);
fStream.Seek((mountInfo.rootOffset + sector) * 512 + (count * sizeof(FAT12_FILE_ENTRY)), SeekOrigin.Begin);
Marshal.StructureToPtr(fat12FileEntry, pinnedBuf.AddrOfPinnedObject(), true);
fStream.Write(buf, 0, sizeof(FAT12_FILE_ENTRY));
return;
}
count++;
unsafe
{
fat12FileEntry = (FAT12_FILE_ENTRY)Marshal.PtrToStructure(pinnedBuf.AddrOfPinnedObject() + (count * sizeof(FAT12_FILE_ENTRY)), typeof(FAT12_FILE_ENTRY));
}
}
}
pinnedBuf.Free();
}
}
static void Main(string[] args)
{
string imageFileName = args[0];
FileInfo image = new FileInfo(imageFileName);
FileStream fStream;
if (image.Exists)
fStream = image.Open(FileMode.Open, FileAccess.ReadWrite);
else
fStream = createNewFloppyImage(image);
FAT12_BOOT_SECTOR bootSector = LoadBootSector(fStream);
FAT12_MOUNT_INFO mount_info = new FAT12_MOUNT_INFO();
mount_info.numSectors = bootSector.Bpb.NumSectors;
mount_info.fatOffset = 1;
mount_info.fatSize = bootSector.Bpb.SectorsPerFat;
mount_info.fatEntrySize = 8;
mount_info.numRootEntries = bootSector.Bpb.NumDirEntries;
mount_info.rootOffset = (uint)(bootSector.Bpb.NumberOfFats * bootSector.Bpb.SectorsPerFat) + 1;
mount_info.rootSize = (uint)(bootSector.Bpb.NumDirEntries * 32) / bootSector.Bpb.BytesPerSector;
for (int i = 1; i < args.Length; i++)
{
SaveFileToDiskImage(args[i], fStream, bootSector, mount_info);
}
}
