private void PutNextEntry(FileStream s, string fileID, string fileName, long fileLength)
{
IEFS_FileInfo fileInfo = new IEFS_FileInfo(fileName, fileID, fileLength);
byte[] data = fileInfo.ToBytes();
s.Seek(0, SeekOrigin.End);
s.Write(data, 0, data.Length);
}
//pos在数据文件中的起始位置（包含文件头信息) len 文件头长度+文件长度
private IEFS_FileInfo GetFileInfo(string searchFileID, out long pos)
{
FileStream dataFileStream = null;
try
{
dataFileStream = new FileStream(_fileName, FileMode.Open, FileAccess.Read, FileShare.None);
if (dataFileStream.Length == 0)
{
pos = 0;
return(null);
}
long total = 0;
while (true)
{
IEFS_FileInfo fileInfo = new IEFS_FileInfo(dataFileStream, total);
if (fileInfo.fielID == searchFileID)
{
pos = total;
return(fileInfo);
}
total = total + fileInfo.BytesLength + fileInfo.fileLength;
if (total == dataFileStream.Length)
{
break;
}
}
pos = 0;
return(null);
}
catch (Exception ex)
{
#region 出错处理
MessageBox.Show(ex.Message);
pos = 0;
return(null);
#endregion
}
finally
{
#region 释放
if (dataFileStream != null)
{
dataFileStream.Close();
}
#endregion
}
}
public bool DeleteFile(string deleteFileID)
{
#region 获取文件信息
long pos = 0;
IEFS_FileInfo fileInfo = GetFileInfo(deleteFileID, out pos);
if (fileInfo == null)
{
return(false);
}
#endregion
FileStream dataFileStream = null;
FileStream destStream = null;
try
{
dataFileStream = new FileStream(_fileName, FileMode.Open, FileAccess.Read, FileShare.None);
destStream = new FileStream(_fileName + ".move", FileMode.Create, FileAccess.ReadWrite, FileShare.None);
CopyDeleteStream(dataFileStream, destStream, pos, fileInfo.BytesLength + fileInfo.fileLength);
return(true);
}
catch (Exception ex)
{
#region 出错处理
MessageBox.Show(ex.Message);
return(false);
#endregion
}
finally
{
#region 释放
if (destStream != null)
{
destStream.Close();
}
if (dataFileStream != null)
{
dataFileStream.Close();
}
#endregion
#region 除与重命名文件
File.Delete(_fileName);
File.Move(_fileName + ".move", _fileName);
#endregion
}
}
public DataTable ListFiles()
{
#region 生成DataTable与其架构
DataTable dataTable = new DataTable();
#region FileID
DataColumn col1 = new DataColumn("FileID");
col1.DataType = typeof(string);
col1.MaxLength = 50;
dataTable.Columns.Add(col1);
#endregion
#region FileName
DataColumn col2 = new DataColumn("FileName");
col2.DataType = typeof(string);
col2.MaxLength = 255;
dataTable.Columns.Add(col2);
#endregion
#region FileLength
DataColumn col3 = new DataColumn("FileLength");
col3.DataType = typeof(int);
dataTable.Columns.Add(col3);
#endregion
#endregion
FileStream dataFileStream = null;
try
{
dataFileStream = new FileStream(_fileName, FileMode.Open, FileAccess.Read, FileShare.None);
if (dataFileStream.Length == 0)
{
return(null);
}
long total = 0;
while (true)
{
IEFS_FileInfo fileInfo = new IEFS_FileInfo(dataFileStream, total);
total = total + fileInfo.BytesLength + fileInfo.fileLength;
DataRow row = dataTable.NewRow();
row.BeginEdit();
row["FileID"] = fileInfo.fielID;
row["FileName"] = fileInfo.fileName;
row["FileLength"] = fileInfo.fileLength;
row.EndEdit();
dataTable.Rows.Add(row);
if (total == dataFileStream.Length)
{
break;
}
}
}
catch (Exception ex)
{
#region 出错处理
MessageBox.Show(ex.Message);
return(null);
#endregion
}
finally
{
#region 释放
if (dataFileStream != null)
{
dataFileStream.Close();
}
#endregion
}
return(dataTable);
}
public bool GetFile(string destFileName, string fileID)
{
#region 获取文件信息
long pos = 0;
IEFS_FileInfo fileInfo = GetFileInfo(fileID, out pos);
if (fileInfo == null)
{
return(false);
}
#endregion
#region 得到临时文件名
string tempPath = Application.StartupPath + @"\tempzip";
CheckTempPath(tempPath);
string tempFileName = tempPath + @"\" + fileID + ".zip";
#endregion
#region 从数据文件中提取相应文件的压缩包
FileStream dataFileStream = null;
FileStream tempFileStream = null;
try
{
dataFileStream = new FileStream(_fileName, FileMode.Open, FileAccess.Read, FileShare.None);
tempFileStream = new FileStream(tempFileName, FileMode.Create, FileAccess.ReadWrite, FileShare.None);
byte[] buffer = new byte[4096];
dataFileStream.Seek(pos + fileInfo.BytesLength, SeekOrigin.Begin);
while (true)
{
int size = dataFileStream.Read(buffer, 0, buffer.Length);
if (size <= 0)
{
break;
}
if (dataFileStream.Position > (pos + fileInfo.BytesLength + fileInfo.fileLength))
{
int xsize = size;
size -= Convert.ToInt32(dataFileStream.Position - pos - fileInfo.BytesLength - fileInfo.fileLength);
if (size == 0)
{
break;
}
buffer = new byte[size];
dataFileStream.Seek(dataFileStream.Position - xsize, SeekOrigin.Begin);
dataFileStream.Read(buffer, 0, buffer.Length);
tempFileStream.Write(buffer, 0, buffer.Length);
break;
}
else
{
tempFileStream.Write(buffer, 0, buffer.Length);
}
}
}
catch (Exception ex)
{
#region 出错处理
MessageBox.Show(ex.Message);
return(false);
#endregion
}
finally
{
#region 释放
if (dataFileStream != null)
{
dataFileStream.Close();
}
if (tempFileStream != null)
{
tempFileStream.Close();
}
#endregion
}
#endregion
#region 从压缩包中解压文件
I3SharpZip.UpZipFileByIndex(tempFileName, destFileName, 4096, 1);
return(true);
#endregion
}
