public static string ReadNullTerminatedString(this byte[] bytes, int offset = 0)
{
var index = 0;
for (index = offset; index < bytes.Length; index++)
{
if (bytes[index] == 0)
{
break;
}
}
var length = index - offset;
if (length <= 0)
{
return(string.Empty);
}
var stringBytes = new byte[length];
Array.Copy(bytes, offset, stringBytes, 0, length);
return(LittleEndianConverter.ConvertToIso88591String(stringBytes));
}
public static async Task <RootBlock> Parse(byte[] blockBytes)
{
var blockStream = new MemoryStream(blockBytes);
var diskType = await blockStream.ReadInt32();
if (diskType != 0x50465301)
{
throw new IOException("Invalid root block");
}
var options = await blockStream.ReadUInt32();
var datestamp = await blockStream.ReadUInt32(); /* current datestamp */
var creationDay = await blockStream.ReadUInt16(); /* days since Jan. 1, 1978 (like ADOS; WORD instead of LONG) */
var creationMinute = await blockStream.ReadUInt16(); /* minutes past modnight */
var creationTick = await blockStream.ReadUInt16(); /* ticks past minute */
var protection = await blockStream.ReadUInt16(); /* protection bits (ala ADOS) */
var diskNameLength = blockStream.ReadByte(); /* disk label (pascal string) */
var diskNameBytes = await blockStream.ReadBytes(31);
var diskName = LittleEndianConverter.ConvertToIso88591String(diskNameBytes, diskNameLength);
var lastReserved = await blockStream.ReadUInt32(); /* reserved area. sector number of last reserved block */
var firstReserved = await blockStream.ReadUInt32(); /* sector number of first reserved block */
var reservedFree = await blockStream.ReadUInt32(); /* number of reserved blocks (blksize blocks) free */
var reservedBlkSize = await blockStream.ReadUInt16(); /* size of reserved blocks in bytes */
var rBlkCluster = await blockStream.ReadUInt16(); /* number of sectors in rootblock, including bitmap */
var blocksFree = await blockStream.ReadUInt32(); /* blocks free */
var alwaysFree = await blockStream.ReadUInt32(); /* minimum number of blocks free */
var rovingPtr = await blockStream.ReadUInt32(); /* current LONG bitmapfield nr for allocation */
var delDir = await blockStream.ReadUInt32(); /* deldir location (<= 17.8) */
var diskSize = await blockStream.ReadUInt32(); /* disksize in sectors */
var extension = await blockStream.ReadUInt32(); /* rootblock extension (16.4) offset=88 $58 */
var notUsed = await blockStream.ReadUInt32();
return(new RootBlock
{
DiskName = diskName,
BlocksFree = blocksFree,
AlwaysFree = alwaysFree,
DiskSize = diskSize
});
}
public static async Task <string> ReadNullTerminatedString(this Stream stream)
{
var stringBytes = new List <byte>();
byte[] buffer = new byte[1];
int bytesRead;
do
{
bytesRead = await stream.ReadAsync(buffer, 0, 1);
if (bytesRead == 1 && buffer[0] != 0)
{
stringBytes.Add(buffer[0]);
}
} while (bytesRead == 1 && buffer[0] != 0);
return(LittleEndianConverter.ConvertToIso88591String(stringBytes.ToArray()));
}
public static async Task <string> ReadString(this Stream stream, int length)
{
return(LittleEndianConverter.ConvertToIso88591String(await stream.ReadBytes(length)));
}
