/// <summary>
/// 对multipart/form-data数据流进行解析
/// </summary>
/// <param name="stream"></param>
/// <param name="encoding"></param>
/// <returns></returns>
public static FrameDLRObject ParseMultipartFormData(Stream stream, Encoding encoding)
{
FrameDLRObject rtn = FrameDLRObject.CreateInstance(FrameDLRFlags.SensitiveCase);
stream.Seek(0, SeekOrigin.Begin);
// Read the stream into a byte array
byte[] data = new byte[stream.Length];
stream.Read(data, 0, data.Length);
string str = encoding.GetString(data);
// Copy to a string for header parsing
string content = encoding.GetString(data);
// The first line should contain the delimiter
int delimiterEndIndex = content.IndexOf("\r\n");
if (delimiterEndIndex > -1)
{
string delimiter = content.Substring(0, content.IndexOf("\r\n"));
int delimiterByteLength = encoding.GetByteCount(delimiter);
string[] sections = content.Split(new string[] { delimiter }, StringSplitOptions.RemoveEmptyEntries);
var splitindexs = ComFunc.BytesSplit(data, delimiter, Encoding.UTF8);
var i = 0;
foreach (string s in sections)
{
//搜索分隔喘在byte[]中所在的位置
if (s.Contains("Content-Disposition"))
{
// If we find "Content-Disposition", this is a valid multi-part section
// Now, look for the "name" parameter
Match nameMatch = new Regex(@"(?<=name\=\"")(.*?)(?=\"")").Match(s);
string name = nameMatch.Value.Trim().ToLower();
// Look for Content-Type
Regex re = new Regex(@"(?<=Content\-Type:)(.*?)(?=\r\n\r\n)");
Match contentTypeMatch = re.Match(s);
// Look for filename
re = new Regex(@"(?<=filename\=\"")(.*?)(?=\"")");
Match filenameMatch = re.Match(s);
if (contentTypeMatch.Success || filenameMatch.Success)
{
// Set properties
var contentype = contentTypeMatch.Value.Trim();
var filename = filenameMatch.Value.Trim();
// Get the start & end indexes of the file contents
int startIndex = contentTypeMatch.Index + contentTypeMatch.Length + "\r\n\r\n".Length;
var prestr = s.Substring(0, startIndex);
startIndex = encoding.GetByteCount(prestr) + splitindexs[i] + delimiterByteLength;
var endIndex = (i + 1) < splitindexs.Length ? splitindexs[i + 1] : data.Length - 1;
//清除首位的换行符
for (int j = 0; j < 2; j++)
{
if (data[startIndex] == 10 || data[startIndex] == 13)
{
startIndex += 1;
}
if (data[endIndex - 1] == 10 || data[endIndex - 1] == 13)
{
endIndex -= 1;
}
}
var contentLength = endIndex - startIndex;
var fileData = new byte[contentLength];
Array.Copy(data, startIndex, fileData, 0, fileData.Length);
var ms = new MemoryStream();
ms.Write(fileData, 0, fileData.Length);
var fuf = new FrameUploadFile(filename, contentype, ms, encoding);
rtn.SetValue(name, fuf);
}
else if (!string.IsNullOrWhiteSpace(name))
{
// Get the start & end indexes of the file contents
int startIndex = nameMatch.Index + nameMatch.Length + "\r\n\r\n".Length;
rtn.SetValue(name, s.Substring(startIndex).TrimEnd(new char[] { '\r', '\n' }).Trim());
}
}
i++;
}
}
return(rtn);
}
