/// <summary>
/// 搜索文件或者目录的主文件表
/// </summary>
/// <param name="dirverHandle"></param>
/// <param name="paths"></param>
/// <param name="buffer"></param>
/// <returns></returns>
public MainFileTable SearchPath(Microsoft.Win32.SafeHandles.SafeFileHandle dirverHandle, IEnumerable <string> paths, byte[] buffer = null)
{
int bufferSize = BytePerSector << 1;
MainFileTable mainFileTable = FindRoot(dirverHandle);
foreach (string path in paths)
{
if (!mainFileTable.IsBuffer)
{
return(default(MainFileTable));
}
bool isPath = false;
foreach (FileIndexEntry fileIndexEntry in mainFileTable.GetIndexEntrys(dirverHandle, this))
{
if (fileIndexEntry.IsFileName(path))
{
if (buffer == null || buffer.Length < bufferSize)
{
buffer = new byte[bufferSize];
}
mainFileTable = Get(dirverHandle, fileIndexEntry, buffer);
isPath = true;
break;
}
}
if (!isPath)
{
return(default(MainFileTable));
}
}
return(mainFileTable);
}
/// <summary>
/// 获取跟目录的主文件表
/// </summary>
/// <param name="dirverHandle"></param>
/// <param name="buffer"></param>
/// <returns></returns>
public MainFileTable FindRoot(Microsoft.Win32.SafeHandles.SafeFileHandle dirverHandle, byte[] buffer = null)
{
int bytePerCluster = (int)BytePerCluster;
long fileIndex = (long)(MainFileTableClusterIndex * (uint)bytePerCluster);
if (Kernel32.SetFilePointer(dirverHandle, fileIndex))
{
if (buffer == null || buffer.Length < bytePerCluster)
{
buffer = new byte[bytePerCluster];
}
do
{
if (Kernel32.ReadFile(dirverHandle, buffer, bytePerCluster) == bytePerCluster)
{
int bufferIndex = 0;
do
{
MainFileTable mainFileTable = new MainFileTable(buffer, bufferIndex, fileIndex);
if (mainFileTable.Buffer != null)
{
foreach (MainFileTableAttribute mainFileTableAttribute in mainFileTable.Attributes)
{
if (mainFileTableAttribute.Type == MainFileTableAttributeType.FileName && !mainFileTableAttribute.ResidentFlag)
{
FileNameAttribute fileNameAttribute = new FileNameAttribute(mainFileTableAttribute);
if (fileNameAttribute.IsRoot)
{
return(mainFileTable);
}
}
}
bufferIndex += (int)mainFileTable.BytesAllocated;
}
else
{
return(default(MainFileTable));
}
}while (bufferIndex < bytePerCluster);
fileIndex += bytePerCluster;
}
else
{
return(default(MainFileTable));
}
}while (true);
}
return(default(MainFileTable));
}
