/// <summary>
/// Extracts files from the http request stream.
/// </summary>
/// <param name="input">Http request stream (body).</param>
/// <returns>Collection of uploaded files.</returns>
public static ICollection <UploadedFile> ExtractFiles(Stream input)
{
using (HttpUploadStream stream = new HttpUploadStream(input, Encoding.UTF8))
{
return(ParseStream(stream));
}
}
private static int FindToken(byte[] array, byte[] token, int arrayOffset)
{
if (array == null)
{
throw new ArgumentNullException("array", "Value cannot be null.");
}
if (token == null)
{
throw new ArgumentNullException("token", "Value cannot be null.");
}
for (int i = arrayOffset; i < array.Length; i++)
{
if (HttpUploadStream.CompareArray(array, token, i, 0, token.Length))
{
return(i - 2); //2 bytes for newline
}
}
return(-1);
}
/// <summary>
/// Reads the file data.
/// </summary>
/// <param name="token">The token for the data.</param>
/// <returns></returns>
public byte[] ReadFileData(string token)
{
long startingPos = this.Position;
byte[] delimiterBytes = this.encoding.GetBytes(token);
int endPos = HttpUploadStream.FindToken(this.ms.ToArray(), delimiterBytes, (int)startingPos);
int filesize = endPos - (int)startingPos;
if (filesize > 0)
{
byte[] fileData = new byte[filesize];
this.Position = startingPos;
this.Read(fileData, 0, fileData.Length);
return(fileData);
}
else
{
return(null);
}
}
private static ICollection <UploadedFile> ParseStream(HttpUploadStream stream)
{
List <UploadedFile> files = new List <UploadedFile>();
string token = stream.ReadLine();
string endToken = token + "--";
stream.Position = 0;
bool wasContentDisposition = false;
bool wasContentType = false;
bool wasToken = false;
string filename = null;
byte[] fileData = null;
while (!stream.IsEndOfStream)
{
if (!wasContentType || !wasContentDisposition || !wasToken) //process headers
{
string line = stream.ReadLine();
if (line == null || line == endToken)
{
break;
}
else if (line == token)
{
wasToken = true;
}
else if (line.StartsWith("Content-Disposition", StringComparison.Ordinal))
{
wasContentDisposition = true;
int fIndex = line.IndexOf("filename=\"", StringComparison.Ordinal);
if (fIndex >= 0)
{
filename = line.Substring(fIndex + 10, line.IndexOf('\"', fIndex + 10) - fIndex - 10);
}
}
else if (line.StartsWith("Content-Type", StringComparison.Ordinal))
{
wasContentType = true;
}
else
{
wasContentDisposition = false;
wasContentType = false;
wasToken = false;
filename = null;
}
}
else //get the file data
{
fileData = stream.ReadFileData(token);
if (fileData != null)
{
UploadedFile file = new UploadedFile();
file.Data = fileData;
if (filename.IndexOf('\\') >= 0)
{
filename = filename.Substring(filename.LastIndexOf('\\') + 1);
}
file.FileName = filename;
files.Add(file);
}
wasContentDisposition = false;
wasContentType = false;
wasToken = false;
filename = null;
}
}
return(files);
}
