public void Save(string text)
{
if (this.notEmpty)
{
bool hasOld = false;
CommentBlock commentBlock = null;
int length = 0;
int start = 0;
int tLen = 0;
FileStream stream = null;
FileStream newStream = null;
BinaryReader reader = null;
try
{
commentBlock = this.ReadComment();
if ((commentBlock != null) && commentBlock.Valid())
{
hasOld = true;
start = commentBlock.start;
}
else
{
start = this.jpegStart();
}
byte[] commentBytes = Encoding.UTF8.GetBytes(text);
length = commentBytes.Length;
if (length > 0xffff)
{
return;
}
stream = new FileStream(this.filename, FileMode.Open, FileAccess.Read);
tLen = (int)stream.Length;
reader = new BinaryReader(stream);
byte[] temp = reader.ReadBytes(start);
int oldLen = 0;
if (hasOld)
{
oldLen = commentBlock.end - commentBlock.start;
reader.ReadBytes(oldLen);
}
byte[] imageData = reader.ReadBytes((tLen - start) - oldLen);
stream.Close();
newStream = new FileStream(this.filename, FileMode.Create, FileAccess.Write);
newStream.Write(temp, 0, start);
if (length > 0)
{
newStream.WriteByte(Convert.ToByte('\x00ff'));
newStream.WriteByte(Convert.ToByte('\x00fe'));
if (length < 0xff)
{
newStream.WriteByte(Convert.ToByte('\0'));
newStream.WriteByte(Convert.ToByte((int)(length + 2)));
}
else if (length <= 0xffff)
{
newStream.WriteByte(Convert.ToByte((length + 2) / 0x100));
newStream.WriteByte(Convert.ToByte((length + 2) - ((length + 2) / 0x100 * 0x100)));
}
newStream.Write(commentBytes, 0, length);
}
newStream.Write(imageData, 0, (tLen - start) - oldLen);
}
finally
{
try
{
if (reader != null)
{
reader.Close();
}
if (stream != null)
{
stream.Close();
}
if (newStream != null)
{
newStream.Close();
}
}
catch
{
}
}
}
}
