In c#, I have a file which has Unix line endings(\r) I need to replace those to Windows (\r\n). But,
1 - I don't know the original file encoding (utf-8, unicode, iso8852-1, etc) and
2 - I don't know how big the original file may be.
The first point is important - I cannot simply read and write each line using a StreamWriter because I don't know the original encoding.
How can I achieve this?
private void Unix2Dos(string fileName)
{
const byte CR = 0x0D;
const byte LF = 0x0A;
byte[] DOS_LINE_ENDING = new byte[] { CR, LF };
byte[] data = File.ReadAllBytes(fileName);
using (FileStream fileStream = File.OpenWrite(fileName))
{
BinaryWriter bw = new BinaryWriter(fileStream);
int position = 0;
int index = 0;
do
{
index = Array.IndexOf<byte>(data, LF, position);
if (index >= 0)
{
if ( ( index > 0 ) && (data[index - 1] == CR ))
{
// already dos ending
bw.Write(data, position, index - position + 1);
}
else
{
bw.Write(data, position, index - position);
bw.Write(DOS_LINE_ENDING);
}
position = index + 1;
}
}
while (index > 0);
bw.Write(data, position, data.Length - position);
fileStream.SetLength(fileStream.Position);
}
}
Reference: http://csharp-goodies.blogspot.com/2011/02/convert-files-from-dos-to-unix-and-back.html