public CommentBlock ReadComment()
{
CommentBlock commentBlock = null;
int length = 0;
string s = "";
int i = 0;
bool done = false;
FileStream stream = null;
BinaryReader reader = null;
if (!this.notEmpty)
{
return(null);
}
try
{
stream = new FileStream(this.filename, FileMode.Open, FileAccess.Read);
length = (int)stream.Length;
if (length <= 0)
{
return(commentBlock);
}
reader = new BinaryReader(stream);
byte[] bytes = reader.ReadBytes(length);
while ((i < length) && !done)
{
if ((bytes[i] == 0xff) && (bytes[i + 1] == 0xfe))
{
if (commentBlock == null)
{
commentBlock = new CommentBlock();
}
if (commentBlock.start == 0)
{
commentBlock.start = i;
}
i += 4;
while ((bytes[i] != 0xff) && (i < length))
{
i++;
}
if ((bytes[i] == 0xff) && (commentBlock.end == 0))
{
commentBlock.end = i;
int len = (commentBlock.end - commentBlock.start) - 4;
int off = commentBlock.start + 4;
if (len > 0)
{
byte[] combytes = new byte[len + 1];
for (int j = 0; j < len; j++)
{
combytes[j] = bytes[off + j];
}
s = Encoding.UTF8.GetString(combytes, 0, len);
}
else if (len == 0)
{
s = "";
}
if ((commentBlock != null) && (s != null))
{
commentBlock.comment = s;
}
done = true;
}
}
i++;
}
}
finally
{
try
{
if (reader != null)
{
reader.Close();
}
if (stream != null)
{
stream.Close();
}
}
catch
{
}
}
return(commentBlock);
}
public CommentBlock ReadComment()
{
CommentBlock commentBlock = null;
int length = 0;
string s = "";
int i = 0;
bool done = false;
FileStream stream = null;
BinaryReader reader = null;
if (!this.notEmpty)
{
return null;
}
try
{
stream = new FileStream(this.filename, FileMode.Open, FileAccess.Read);
length = (int) stream.Length;
if (length <= 0)
{
return commentBlock;
}
reader = new BinaryReader(stream);
byte[] bytes = reader.ReadBytes(length);
while ((i < length) && !done)
{
if ((bytes[i] == 0xff) && (bytes[i + 1] == 0xfe))
{
if (commentBlock == null)
{
commentBlock = new CommentBlock();
}
if (commentBlock.start == 0)
{
commentBlock.start = i;
}
i += 4;
while ((bytes[i] != 0xff) && (i < length))
{
i++;
}
if ((bytes[i] == 0xff) && (commentBlock.end == 0))
{
commentBlock.end = i;
int len = (commentBlock.end - commentBlock.start) - 4;
int off = commentBlock.start + 4;
if (len > 0)
{
byte[] combytes = new byte[len + 1];
for (int j = 0; j < len; j++)
{
combytes[j] = bytes[off + j];
}
s = Encoding.UTF8.GetString(combytes, 0, len);
}
else if (len == 0)
{
s = "";
}
if ((commentBlock != null) && (s != null))
{
commentBlock.comment = s;
}
done = true;
}
}
i++;
}
}
finally
{
try
{
if (reader != null)
{
reader.Close();
}
if (stream != null)
{
stream.Close();
}
}
catch
{
}
}
return commentBlock;
}
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
{
}
}
}
}