below file uploading code has one error "toBytes[i-start]=fromBytes; " incompatable type error please help me how to solve this error

<%@ page import="java.io.*,javax.servlet.http.HttpServletRequest,javax.servlet.ServletInputStream" %>
<%@ page import="java.io.FileWriter,java.io.IOException" %>
<%
String savePath = "",filepath="",filename="";
String contentType ="", fileData = "", strLocalFileName = "";
int startPos = 0;
int endPos = 0;
%>
<%!
void copyByte(byte[] fromBytes,byte[] toBytes,int start,int len)
{
for(int i=start;i<(start+len);i++)
{
toBytes[i-start]=fromBytes;
}
}
%>
<%
int BOF=0,EOF=0;
contentType = request.getContentType();
out.println("
Content type is :: " +contentType);
if ((contentType != null) && (contentType.indexOf("multipart/form-data") >=0))
{
DataInputStream in = new DataInputStream(request.getInputStream());
DataInputStream in1 = in;
int formDataLength = request.getContentLength();
byte dataBytes[] = new byte[formDataLength];
int byteRead = 0;
int totalBytesRead = 0;
while (totalBytesRead < formDataLength)
{
byteRead = in1.read(dataBytes, totalBytesRead, formDataLength);
totalBytesRead += byteRead;
}
out.println("
totalBytesRead:"+totalBytesRead +":formDataLength = " + formDataLength);

//String file = new String(dataBytes);
//out.println("
FileContents:
////////////////////////////////////
" + file +"
////////////////////////////////
");
byte[] line = new byte[128];
if (totalBytesRead < 3)
{
return; //exit if file length is not sufficiently large
}

String boundary = "";
String s = "";
int count = 0;
int pos = 0;

//loop for extracting boundry of file
//could also be extracted from request.getContentType()
do
{
copyByte(dataBytes, line, count ,1); //read 1 byte at a time
count+=1;
s = new String(line, 0, 1);
fileData = fileData + s;
pos = fileData.indexOf("Content-Disposition: form-data; name=\""); //set the file name
if(pos != -1)
endPos = pos;
}while(pos == -1);
boundary = fileData.substring(startPos, endPos);

//loop for extracting filename
startPos = endPos;
do
{
copyByte(dataBytes, line, count ,1); //read 1 byte at a time
count+=1;
s = new String(line, 0, 1);
fileData = fileData + s;
pos = fileData.indexOf("filename=\"", startPos); //set the file name
if(pos != -1)
startPos = pos;
}while(pos == -1);
do
{
copyByte(dataBytes, line, count ,1); //read 1 byte at a time
count+=1;
s = new String(line, 0, 1);
fileData = fileData + s;
pos = fileData.indexOf("Content-Type: ", startPos);
if(pos != -1)
endPos = pos;
}while(pos == -1);
filename = fileData.substring(startPos + 10, endPos - 3); //to eliminate "from start & end
strLocalFileName = filename;
int index = filename.lastIndexOf("\");
if(index != -1)
filename = filename.substring(index + 1);
else
filename = filename;

//loop for extracting ContentType
boolean blnNewlnFlag = false;
startPos = endPos; //added length of "Content-Type: "
do
{
copyByte(dataBytes, line, count ,1); //read 1 byte at a time
count+=1;
s = new String(line, 0, 1);
fileData = fileData + s;
pos = fileData.indexOf("\n", startPos);
if(pos != -1)
{
if(blnNewlnFlag == true)
endPos = pos;
else
{
blnNewlnFlag = true;
pos = -1;
}
}
}while(pos == -1);
contentType = fileData.substring(startPos + 14, endPos);

//loop for extracting actual file data (any type of file)
startPos = count + 1;
do
{
copyByte(dataBytes, line, count ,1); //read 1 byte at a time
count+=1;
s = new String(line, 0, 1);
fileData = fileData + s;
pos = fileData.indexOf(boundary, startPos); //check for end of file datai.e boundry value
}while(pos == -1);
endPos = count - boundary.length();
//file data extracted

out.println("

0. Local File Name = " + strLocalFileName);
out.println("

1. filename = " + filename);
out.println("
2. contentType = " + contentType);
out.println("
3. startPos = " + startPos);
out.println("
4. endPos = " + endPos);
out.println("
5. boundary = " + boundary);

//create destination path & save file there
String appPath = application.getRealPath("/");
out.println("
appPath : " + appPath);
String destFolder = appPath + "images/banner/";
filename= destFolder + filename;
FileOutputStream fileOut = new FileOutputStream(filename);
fileOut.write(dataBytes, startPos, (endPos - startPos));
fileOut.flush();
fileOut.close();
out.println("
File saved as >> " + filename);
//file saved at destination
//out.println("
File data :

*******
"+(new String(dataBytes,startPos, (endPos - startPos))) +"

*******");
}
else
{
out.println("Error in uploading ");
}

%>