using System;
using System.Collections.Generic;
using System.Text;
using System.Security.AccessControl;
using System.IO;
using System.Security.Principal;
namespace Td.Additional.IO
{
///
/// File facilities.
///
public static class File
{
///
/// Compares the specified file1.
/// This method accepts two strings the represent two files to
/// compare.
///
/// The file1.
/// The file2.
/// True, if files are equal, otherwise false.
private static bool Compare(string file1, string file2)
{
int file1byte;
int file2byte;
FileStream fs1;
FileStream fs2;
// Determine if the same file was referenced two times.
if (file1 == file2)
{
// Return true to indicate that the files are the same.
return true;
}
// Open the two files.
fs1 = new FileStream(file1, FileMode.Open);
fs2 = new FileStream(file2, FileMode.Open);
// Check the file sizes. If they are not the same, the files
// are not the same.
if (fs1.Length != fs2.Length)
{
// Close the file
fs1.Close();
fs2.Close();
// Return false to indicate files are different
return false;
}
// Read and compare a byte from each file until either a
// non-matching set of bytes is found or until the end of
// file1 is reached.
do
{
// Read one byte from each file.
file1byte = fs1.ReadByte();
file2byte = fs2.ReadByte();
}
while ((file1byte == file2byte) && (file1byte != -1));
// Close the files.
fs1.Close();
fs2.Close();
// Return the success of the comparison. "file1byte" is
// equal to "file2byte" at this point only if the files are
// the same.
return ((file1byte - file2byte) == 0);
}
}
}