How to Split and Merge files using C#.NET

How to Split and Merge files using C#.NET

Namespace

using System.IO;

Variable Declaration

private const long FILE_SIZE_MB = 1024 * 1024;

private const long FILE_SIZE_KB = 1024;

private FileStream FSIn, FSout;

private int PreDefinedCacheSize;

Private Methods

// Gives the Filename from the long Path

private string FileName(string strString)

{

return strString.Substring(strString.LastIndexOf("\\"));

}

// This will set the Cache size

private int DefineCache(int useCache)

{

if (useCache == 8) return 8192;

else return 8192 * 2;

}

//This will give the file size

private long GetSizes(string[] strFileZ)

{

long intSizeToReturn = 0;

foreach (string a in strFileZ)

{

FileStream tmpFS = new FileStream(a, FileMode.Open);

intSizeToReturn += tmpFS.Length;

tmpFS.Close();

}

return intSizeToReturn;

}

Example to Run SplitFile function

strFileName = @"C:\backup\standards.zip;

strPathName = @"C:\backup\

lgSize = 10 * FILE_SIZE_MB

private bool SplitFile(string strFileName, string strPathName,long lgSize)

{

string strDirectory = "", strNewFileNames = "";

long FileSize = 0;

int intCounter = 0;

// Code to Check whether it is logical or not to Continue...

FSIn = new FileStream(strFileName, FileMode.Open);

BinaryReader rFSIn = new BinaryReader(FSIn);

FileSize = FSIn.Length;

if (FileSize < lgSize)

{

//MessageBox.Show("Check Sizes!!");

return false;

}

strDirectory = strPathName + FileName(strFileName);

//split it to parts in a folder Called "FileName"

if (!System.IO.Directory.Exists(strDirectory))

{

System.IO.Directory.CreateDirectory(strDirectory);

}

//begin writing

while (FSIn.Position != FSIn.Length)

{

PreDefinedCacheSize = DefineCache(8);

byte[] buffer = new byte[PreDefinedCacheSize];

strNewFileNames = strDirectory + "\\" + intCounter.ToString() + ".part";

FSout = new FileStream(strNewFileNames, FileMode.Create);

BinaryWriter wFSOut = new BinaryWriter(FSout);

while ((FSout.Position < lgSize) && (FSIn.Position != FSIn.Length))

{

if (((FSIn.Length - FSIn.Position) < Math.Min(PreDefinedCacheSize, (int)lgSize)) && (PreDefinedCacheSize > lgSize))

{

PreDefinedCacheSize = (int)FSIn.Length - (int)FSIn.Position;

rFSIn.Read(buffer, 0, PreDefinedCacheSize);

wFSOut.Write(buffer);

}

else

{

if (PreDefinedCacheSize > lgSize) PreDefinedCacheSize = (int)lgSize;

rFSIn.Read(buffer, 0, PreDefinedCacheSize);

wFSOut.Write(buffer);

}

}

wFSOut.Close();

FSout.Close();

intCounter++;

}

//finish

rFSIn.Close();

return true;

}

Example to Run MergeFile function

strDirectory = "D:\standards";

private bool MergerFile(string strDirectory)

{

string[] strFiles = Directory.GetFiles(strDirectory, "*.part");

FSout = new FileStream(strDirectory + "\\" + FileName(strDirectory), FileMode.Create);

BinaryWriter wFSOut = new BinaryWriter(FSout);

long FileSizes = 0;

FileSizes = GetSizes(strFiles);

foreach (string a in strFiles)

{

PreDefinedCacheSize = DefineCache(8);

FSIn = new FileStream(strDirectory + "\\" + FileName(a), FileMode.Open);

BinaryReader rFSIn = new BinaryReader(FSIn);

if (PreDefinedCacheSize > FSIn.Length - FSIn.Position)

PreDefinedCacheSize = (int)FSIn.Length - (int)FSIn.Position;

byte[] buffer = new byte[PreDefinedCacheSize];

while (FSIn.Position != FSIn.Length)

{

rFSIn.Read(buffer, 0, PreDefinedCacheSize);

wFSOut.Write(buffer);

}

rFSIn.Close();

FSIn.Close();

}

wFSOut.Close();

FSout.Close();

return true;

}

Ritesh Kesharwani