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Lithorien
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Joined: 20 Jun 2004
Posts: 40
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 Posted: Sun Sep 11, 2005 9:21 pm Post subject: C++ File Uploading |
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Does Abyss Web Server break up POSTs sent by the browser over 256B in size to multiple requests?
The reason I ask is because I am trying to write a file uploading program in C++ - It works fine, on any type of file, until the file becomes larger than 256B. At that point, the program hangs and does nothing until I kill it manually. I've noticed that AWS sends data in POST requests a certain way, and was wondering if there's something going on like this:
Less-than-256B files dump output similar to this:
| Quote: | -----------------------------100801427118047
Content-Disposition: form-data; name="file"; filename="Text.txt"
Content-Type: text/plain
Test
This is a test.
-----------------------------100801427118047-- |
So would greater-than-256b files dump output like this?
| Quote: | -----------------------------100801427118047
Content-Disposition: form-data; name="file"; filename="Text.txt"
Content-Type: text/plain
(256 B of information here)
-----------------------------100801427118047--
Content-Disposition: form-data; name="file"; filename="Text.txt"
Content-Type: text/plain
(15 B additional information here)
-----------------------------100801427118047--
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Thank you for any assistance. |
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aprelium
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Joined: 22 Mar 2002
Posts: 6800
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| Posted: Mon Sep 12, 2005 12:58 pm Post subject: Re: C++ File Uploading |
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Lithorien,
POSTed data comes from the browser and not from the web server. In no way Abyss Web Server changes the data that is POSTed from your browser. Abyss simply forwards to the CGI process the data as it receives it from the client (browser).
There is also no 256KB limit. In PHP for example, you can upload files that are larger than that (several MB) with no problem.
By the way, what is the browser you're using to send this file? What are the HTTP headers that are sent to the CGI process?
Having your code could also help us understand the origin of the problem.
By the way, we recommend checking the specification of FILE uploads in http://www.faqs.org/rfcs/rfc1867.html .
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Aprelium - http://www.aprelium.com |
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Lithorien
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Joined: 20 Jun 2004
Posts: 40
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| Posted: Tue Sep 13, 2005 1:15 am Post subject: Re: C++ File Uploading |
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| aprelium wrote: | Lithorien,
POSTed data comes from the browser and not from the web server. In no way Abyss Web Server changes the data that is POSTed from your browser. Abyss simply forwards to the CGI process the data as it receives it from the client (browser). |
Aha. I thought POSTed information was processed by the server and reformatted. Thanks for answering that. :)
| aprelium wrote: | There is also no 256KB limit. In PHP for example, you can upload files that are larger than that (several MB) with no problem.
By the way, what is the browser you're using to send this file? What are the HTTP headers that are sent to the CGI process? |
The browser is Mozilla 1.8a6. The process recieves exactly what you saw below: That quoted text is everything it gets.
| aprelium wrote: | Having your code could also help us understand the origin of the problem.
By the way, we recommend checking the specification of FILE uploads in http://www.faqs.org/rfcs/rfc1867.html . |
I did read the RFC that you've linked to, and here's the code so you can see what's going on:
| Code: | int upload()
{
header();
std::string file;
double fsize = atoi(getenv("CONTENT_LENGTH"));
std::getline(std::cin, file, '\n'); // Junk
fsize -= file.size();
std::getline(std::cin, file, '\n'); // Content-Disposition: xxx; xxx; filename=
fsize -= file.size();
std::string filename = "uploads/";
for (int x = (file.find("filename=", 0) + 10); x < (file.size() - 1); x++)
{
filename += file[x];
}
std::getline(std::cin, file, '\n'); // Content-Type: x/x
fsize -= file.size();
std::getline(std::cin, file, '\n'); // Blank
fsize -= file.size();
std::ofstream oFile(filename.c_str(), std::ios::binary);
for (int x = 0; x < (fsize - 61); x++)
{
char *temp = new char;
std::cin.read(temp, 1);
std::cout.write(temp, 1);
//oFile << file;
}
oFile.close();
// Perform error checking for file upload here.
std::cout << "File uploaded successfully to <a href=\"" << filename << "\">" << filename << "</a>";
footer();
return(0);
} |
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aprelium
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Joined: 22 Mar 2002
Posts: 6800
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| Posted: Tue Sep 13, 2005 3:20 pm Post subject: Re: C++ File Uploading |
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Lithorien,
We'll give it a try and get back to you as soon as possible.
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cagozoe
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Joined: 24 Apr 2005
Posts: 23
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Lithorien
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Joined: 20 Jun 2004
Posts: 40
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| Posted: Wed Sep 14, 2005 4:22 am Post subject: Re: file upload |
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It's not a matter of needing the script. It's a matter of learning how to do it myself.
But thank you for the offer. :) |
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admin
Site Admin
Joined: 03 Mar 2002
Posts: 1295
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| Posted: Mon Sep 19, 2005 1:45 pm Post subject: Re: C++ File Uploading |
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Lithorien,
Can you please send to support@aprelium.com all your C++ code as well as your HTML form page (if any)? This will help us review the code and check what is wrong (we tried checking with the code excerpt you've sent to us but we had many problems with it).
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