public IFile ParseStream(Stream stream, string name, IProgressReporter reporter)
{
if (stream == null)
{
throw new ArgumentNullException(nameof(stream));
}
var fatPartType = GetFatType(stream);
if (fatPartType == null)
{
LoggerService.WriteCallerLine($"{nameof(FATPartType)} can't be null.");
return(null);
}
var part = FileFactory.CreatePartition(Constants.PartitionKey_FAT);
var stoken = part.GetStoken(Constants.PartitionKey_FAT);
stoken.BaseStream = stream;
stoken.Name = name;
stoken.Size = stream.Length;
stoken.TypeGuid = Constants.PartitionType_FAT32;
if (fatPartType == FATPartType.FAT32)
{
stoken.PartType = ServiceProvider.GetAllInstances <IPartitionType>().FirstOrDefault(p => p.GUID == Constants.PartitionType_FAT32);
}
else
{
stoken.PartType = ServiceProvider.GetAllInstances <IPartitionType>().FirstOrDefault(p => p.GUID == Constants.PartitionType_FAT16);
}
var unmanagedManager = new UnmanagedFATManager(stream);
var partInfo = new FATPartInfo {
UnmanagedFATManager = unmanagedManager
};
//设定FAT分区详细信息;
stoken.SetInstance(partInfo, Constants.PartitionStokenTag_FATPartInfo);
if (unmanagedManager.FATManagerPtr == IntPtr.Zero)
{
unmanagedManager.Dispose();
throw new InvalidOperationException($"{nameof(unmanagedManager.FATManagerPtr)} can't be nullptr.");
}
LoadPartInfo(partInfo);
LoadPartContent(part, reporter);
part.Disposing += OnPartDisposing;
return(part);
}
/// <summary>
/// 加载文件系统基本信息;
/// </summary>
/// <param name="info"></param>
private static void LoadPartInfo(FATPartInfo info)
{
if (info == null)
{
throw new ArgumentNullException(nameof(info));
}
try {
var infoPtr = Fat_Get_FsInfo(info.UnmanagedFATManager.FATManagerPtr);
var infoPtrBack = Fat_Get_BackupFsInfo(info.UnmanagedFATManager.FATManagerPtr);
var dbrPtr = Fat_Get_FsDBR(info.UnmanagedFATManager.FATManagerPtr);
var dbrPtrBack = Fat_Get_BackupFsDBR(info.UnmanagedFATManager.FATManagerPtr);
//为避免多次编写重复的判断是否为空,赋值语句,减少错误率,使用泛型方法将逻辑统一,编辑DBR或者Info;
void SetFatDbrOrInfo <TFsEntity, TEntity>(
IntPtr fsPtr, Func <TFsEntity, IntPtr> getEntityPtr,
Func <TFsEntity, long> getOffset,
Action <TEntity, long> setInfoOrDBR)
where TFsEntity : struct
where TEntity : struct