More work on decoding multipart form data

This commit is contained in:
Frank A. Krueger 2017-08-22 21:24:52 -07:00
parent 817454dea4
commit 5e7385a96b
1 changed files with 93 additions and 1 deletions

View File

@ -1,4 +1,5 @@
using System;
using System.Collections.Generic;
using System.Net;
using System.Threading;
using Ooui;
@ -35,11 +36,102 @@ namespace Samples
var ct = req.ContentType;
var bi = ct.IndexOf ("boundary=", StringComparison.InvariantCulture);
var boundaryString = ct.Substring (bi + 9);
var boundaryBytes = System.Text.Encoding.UTF8.GetBytes (boundaryString);
var boundaryBytes = System.Text.Encoding.UTF8.GetBytes ("--" + boundaryString + "\r\n");
var boundaryEndBytes = System.Text.Encoding.UTF8.GetBytes (boundaryString + "--");
var headerEndBytes = System.Text.Encoding.UTF8.GetBytes ("\r\n\r\n");
Console.WriteLine ("OMGGGGGG " + boundaryString);
var state = 0;
var buffer = new byte[1024];
var bufferLen = 0;
var needsRead = true;
using (var s = req.InputStream) {
while (state < 1000) {
if (needsRead) {
var r = buffer.Length - bufferLen;
if (r <= 0) {
Array.Resize (ref buffer, buffer.Length * 2);
r = buffer.Length - bufferLen;
}
var n = s.Read (buffer, bufferLen, r);
if (n > 0) {
bufferLen += n;
}
else if (n == 0) {
// End!
state = 1000;
}
else {
state = 1001;
}
}
switch (state) {
case 0:
var i = FindIndex (buffer, 0, bufferLen, boundaryBytes);
if (i >= 0) {
var e = i + boundaryBytes.Length;
var r = bufferLen - e;
Buffer.BlockCopy (buffer, e, buffer, 0, r);
bufferLen = r;
state = 1;
}
else {
needsRead = true;
}
break;
case 1:
i = FindIndex (buffer, 0, bufferLen, headerEndBytes);
if (i >= 0) {
var h = System.Text.Encoding.ASCII.GetString (buffer, 0, i);
Console.WriteLine ("HEADERS {0}", h);
var e = i + headerEndBytes.Length;
var r = bufferLen - e;
Buffer.BlockCopy (buffer, e, buffer, 0, r);
bufferLen = r;
state = 2;
}
else {
needsRead = true;
}
break;
case 2:
i = FindIndex (buffer, 0, bufferLen, boundaryEndBytes);
if (i >= 0) {
Console.WriteLine ("DATA {0}", bufferLen);
var data = new byte[bufferLen];
var e = i + boundaryBytes.Length;
var r = bufferLen - e;
Buffer.BlockCopy (buffer, e, buffer, 0, r);
bufferLen = r;
state = 0;
}
else {
needsRead = true;
}
break;
}
}
}
Console.WriteLine ("STATE " + state);
listenerContext.Response.StatusCode = 200;
listenerContext.Response.Close ();
}
static int FindIndex (byte[] buffer, int bufferStart, int bufferLen, byte[] pattern)
{
var n = pattern.Length;
for (var i = bufferLen - n; i >= bufferStart; i--) {
var all = true;
for (var j = 0; all && j < n; j++) {
all = buffer[i + j] == pattern[j];
}
if (all)
return i;
}
return -1;
}
}
}