/// <summary>
/// 读取数据
/// </summary>
/// <param name="dirverHandle"></param>
/// <param name="newTechnologyFileSystem"></param>
/// <param name="buffer"></param>
/// <returns></returns>
public IEnumerable <byte[]> ReadData(Microsoft.Win32.SafeHandles.SafeFileHandle dirverHandle, NewTechnologyFileSystem newTechnologyFileSystem, byte[] buffer = null)
{
int bytePerCluster = (int)newTechnologyFileSystem.BytePerCluster;
foreach (ClusterStream clusterStream in ClusterStreams)
{
if (!Kernel32.SetFilePointer(dirverHandle, clusterStream.Offset * bytePerCluster))
{
yield return(null);
break;
}
for (long ClusterCount = clusterStream.ClusterCount; ClusterCount > 0; --ClusterCount)
{
if (buffer == null || buffer.Length < bytePerCluster)
{
buffer = new byte[bytePerCluster];
}
if (Kernel32.ReadFile(dirverHandle, buffer, bytePerCluster) != bytePerCluster)
{
yield return(null);
goto RETURN;
}
yield return(buffer);
}
}
RETURN :;
}
/// <summary>
/// 保存第一个扇区数据（基本数据）
/// </summary>
/// <param name="dirverHandle"></param>
/// <param name="newTechnologyFileSystem"></param>
/// <returns></returns>
public bool WriteSector(Microsoft.Win32.SafeHandles.SafeFileHandle dirverHandle, NewTechnologyFileSystem newTechnologyFileSystem)
{
if (Kernel32.SetFilePointer(dirverHandle, fileIndex + startIndex) && Kernel32.GetFilePointer(dirverHandle) == fileIndex + startIndex)
{
byte[] buffer = Buffer;
if (startIndex != 0)
{
buffer = new byte[newTechnologyFileSystem.BytePerSector];
System.Buffer.BlockCopy(Buffer, startIndex, buffer, 0, buffer.Length);
}
int writeSize = Kernel32.WriteFileWithLockVolume(dirverHandle, buffer, newTechnologyFileSystem.BytePerSector);
return(writeSize == newTechnologyFileSystem.BytePerSector);
}
return(false);
}
/// <summary>
/// 枚举索引项集合
/// </summary>
/// <param name="dirverHandle"></param>
/// <param name="newTechnologyFileSystem"></param>
/// <param name="buffer"></param>
/// <returns></returns>
public IEnumerable <FileIndexEntry> GetIndexEntrys(Microsoft.Win32.SafeHandles.SafeFileHandle dirverHandle, NewTechnologyFileSystem newTechnologyFileSystem, byte[] buffer = null)
{
foreach (MainFileTableAttribute mainFileTableAttribute in Attributes)
{
switch (mainFileTableAttribute.Type)
{
case MainFileTableAttributeType.IndexRoot:
IndexRootAttribute IndexRootAttribute = new IndexRootAttribute(mainFileTableAttribute);
foreach (FileIndexEntry fileIndexEntry in IndexRootAttribute.IndexEntrys)
{
yield return(fileIndexEntry);
}
break;
case MainFileTableAttributeType.IndexAllocation:
ClusterStreamAttribute indexAllocationAttribute = new ClusterStreamAttribute(mainFileTableAttribute);
foreach (byte[] data in indexAllocationAttribute.ReadData(dirverHandle, newTechnologyFileSystem, buffer))
{
if (data != null)
{
FileIndex fileIndex = new FileIndex(data);
if (fileIndex.Buffer == null)
{
break;
}
foreach (FileIndexEntry fileIndexEntry in fileIndex.IndexEntrys)
{
yield return(fileIndexEntry);
}
}
}
break;
}
}
}
/// <summary>
/// 调试检查第一个扇区数据（基本数据）是否和内存数据是否一致
/// </summary>
/// <param name="dirverHandle"></param>
/// <param name="newTechnologyFileSystem"></param>
/// <returns></returns>
public unsafe bool CheckSector(Microsoft.Win32.SafeHandles.SafeFileHandle dirverHandle, NewTechnologyFileSystem newTechnologyFileSystem)
{
if (Kernel32.SetFilePointer(dirverHandle, fileIndex + startIndex))
{
byte[] buffer = new byte[newTechnologyFileSystem.BytePerSector];
if (Kernel32.ReadFile(dirverHandle, buffer) == buffer.Length)
{
fixed(byte *bufferFixed = Buffer, readBufferFixed = buffer)
{
return(AutoCSer.Memory.Common.EqualNotNull(bufferFixed + startIndex, readBufferFixed, buffer.Length));
}
}
}
return(false);
}
/// <summary>
/// 获取文件记录的起始扇区号，每一项占用2个扇区
/// </summary>
/// <param name="NTFS"></param>
/// <returns></returns>
public ulong GetSectorIndex(NewTechnologyFileSystem NTFS)
{
return(NTFS.MainFileTableSectorIndex + (MainFileTableIndex << 1));
}
