// 添加一个所属记录
private void AddToParentPath(Types.VirtualPathInfo parent, long posInfo)
{
// 父对象为根目录，且当前位置为1时，不保存直接退出
if (parent.Type == Path_Type_Root && posInfo == 1)
{
return;
}
// 指针移向子路径
long pos = parent.FirstChildPosition;
// 当父路径中无子路径时，直接设置FirstChildPosition
if (pos == 0)
{
parent.FirstChildPosition = posInfo;
SavePathInfo(parent);
return;
}
while (pos > 0)
{
// 读取对应路径的路径信息
var info = GetPathInfo(pos);
// 判断是否为最后一个子目录
pos = info.NextPosition;
if (info.NextPosition == 0)
{
info.NextPosition = posInfo;
SavePathInfo(info);
}
}
}
// 获取路径信息
private Types.VirtualPathInfo GetPathInfo(long pos)
{
Types.VirtualPathInfo res = new Types.VirtualPathInfo();
res.Position = pos;
using (dpz3.File.BinaryFile file = new File.BinaryFile(workPath, System.IO.FileMode.OpenOrCreate)) {
file.Position = pos * Data_Info_Size;
// 读取Sign
try {
// 读取NextPosition
res.NextPosition = file.Read();
res.NextPosition += file.Read() * 256;
res.NextPosition += file.Read() * 256 * 256;
res.NextPosition += file.Read() * 256 * 256 * 256;
// 读取FirstChildPosition
res.FirstChildPosition = file.Read();
res.FirstChildPosition += file.Read() * 256;
res.FirstChildPosition += file.Read() * 256 * 256;
res.FirstChildPosition += file.Read() * 256 * 256 * 256;
// 读取Type
res.Type = file.Read();
// 读取Name
res.Name = file.Read(Path_Name_Size);
} catch (Exception ex) {
throw new Exception("磁盘数据损坏", ex);
}
}
return(res);
}
// 保存路径信息
private void SavePathInfo(Types.VirtualPathInfo info)
{
using (dpz3.File.BinaryFile file = new File.BinaryFile(workPath, System.IO.FileMode.OpenOrCreate)) {
file.Position = info.Position * Data_Info_Size;
// 输出NextPosition
file.Write(GetBytesFromLong(info.NextPosition));
// 输出FirstChildPosition
file.Write(GetBytesFromLong(info.FirstChildPosition));
// 读取Type
file.Write(new byte[] { info.Type });
// 读取Name
file.Write(info.Name);
}
}
// 获取路径寻址
private Types.VirtualPathInfo GetPathInfo(Types.VirtualPathInfo parent, string name)
{
long pos = parent.FirstChildPosition;
while (pos > 0)
{
// 读取对应路径的路径信息
var info = GetPathInfo(pos);
// 生成名称
StringBuilder sb = new StringBuilder();
for (int i = 0; i < Path_Name_Size; i += 2)
{
int code = info.Name[i] + info.Name[i + 1] * 256;
if (code > 0)
{
sb.Append((char)code);
}
else
{
break;
}
}
string pName = sb.ToString();
// 判断名称是否匹配
if (pName == name)
{
return(info);
}
else
{
// 对比下一个路径
pos = info.NextPosition;
}
}
return(new Types.VirtualPathInfo());
}
// 获取路径信息
private Types.VirtualPathInfo GetPathInfo(string path)
{
// 判断路径是否为空
if (path.IsNoneOrNull())
{
throw new Exception("尚未指定父路径");
}
// 定义路径信息
Types.VirtualPathInfo info = new Types.VirtualPathInfo();
info.Position = 0;
info.Type = Path_Type_Root;
info.FirstChildPosition = 1;
// 当路径为根路径时，直接返回一个Root的特有信息
if (path == "/")
{
return(info);
}
// 获取所有的子路径
string parentPath = GetParentFolder(path);
var parentInfo = GetPathInfo(parentPath);
// 当类型为空时，表示路径不存在，则直接返回空信息
if (parentInfo.Type == 0)
{
return(parentInfo);
}
if ((parentInfo.Type & Path_Type_File) == Path_Type_File)
{
throw new Exception($"路径\"{parentPath}\"不是目录");
}
// 获取路径名称信息
string name = GetName(path);
return(GetPathInfo(parentInfo, name));
}