DSiBrew - User contributions [en]

Nintendo CDN Files

2020-11-21T02:05:18Z

Zedseven:

== Files on the Nintendo CDN ==
On the Nintendo CDN, there are a few kinds of files for each game/title:
* Metadata (tmd)
* Ticket (cetk)
* Content files ('''00000000''' and up)

== Server File ID ==
Note that "we" refers to [[User:Hiccup|Hiccup]] and [[User:zedseven|zedseven]].

In addition to the expected files (tmd, cetk, game content), there are a number of other files accessible by the same content ID system as is used to access game content.

If you try to access a non-existent file, the server gives you an error - for instance, with http://nus.cdn.t.shop.nintendowifi.net/ccs/download/0000000000000000/00000000 you get something akin to the following:

[[File:NUS-Screenshot-0000000000000000-00000000.png]]

(response header has 404 in status code, with Last-Modified field indicating that this page is generated on the fly)

The text in the square brackets appears to be some kind of server file id. Note that if you request a nonexistent cetk, it's server file id is reported as 4294967293 (0xFFFFFFFD).

[[File:NUS-Screenshot-0000000000000000-cetk.png]]

(with http://nus.cdn.t.shop.nintendowifi.net/ccs/download/0000000000000000/cetk)

Through this, we guessed that cetks do in fact have content IDs, and it turns out tmds also do, although if you request a tmd (either as "tmd" or "tmd.[version]", the server file ID is not reported by the error message (see [[#Special Content IDs]] for more info).

[[File:NUS-Screenshot-0000000000000000-tmd.png]]

(with http://nus.cdn.t.shop.nintendowifi.net/ccs/download/0000000000000000/tmd)

The function used for the server file ID is as follows:


[[File:Server-File-ID-Equation.png]]

Where '''t''' is the title ID, and '''c''' is the content ID.

== Special Content IDs ==
The special content IDs have been found on the 3DS CDN as well, but Wii and Wii U have not been tested.

=== FFFD0000 ===
DSi Shop content starts at '''FFFD0000''' and increments up. This content is often icons and screenshots, (typically GIF or BMP interchangeably), with some ZIP file manuals for system titles mixed in as well.

=== FFFEFFFF ===
tmd content is stored at this content ID. The very first version is '''FFFEFFFF''', and subsequent versions decrement the value (second version is '''FFFEFFFE''', third is '''FFFEFFFD''', etc.).
Because tmd versions aren't sequential, this sequential versioning allows us to check if any versions have been deleted from the CDN.
No titles were found to have deleted versions.

=== FFFFFFFD ===
This is the content ID of cetk, if it exists for a given title.

=== FFFFFFFE ===
This is a file that exists for every existing title, however it is always 0 bytes in size.
We suspect it is used as a way of checking if a title exists on the CDN, since no other files have unchanging, consistent names (tmd kind of does, but we suspect it's auto-generated as the latest version - the file "tmd" probably doesn't exist on the server).

User:Zedseven

2020-11-18T00:30:38Z

Zedseven: Created page with "Mostly just here to publish User:Hiccup| and I's findings about the Nintendo CDN Files#Special Content IDs for everyone to see and benefit from."

Mostly just here to publish [[User:Hiccup|Hiccup]] and I's findings about the [[Nintendo CDN Files#Special Content IDs]] for everyone to see and benefit from.

Nintendo CDN Files

2020-11-18T00:24:30Z

Zedseven: A page detailing Nintendo CDN files, and the known special content IDs of the NUS.

== Files on the Nintendo CDN ==
On the Nintendo CDN, there are a few kinds of files for each game/title:
* Metadata (tmd)
* Ticket (cetk)
* Content files ('''00000000''' and up)

== Server File ID ==
Note that "we" refers to [[User:Hiccup|Hiccup]] and [[User:zedseven|zedseven]].

In addition to the expected files (tmd, cetk, game content), there are a number of other files accessible by the same content ID system as is used to access game content.

If you try to access a non-existent file, the server gives you an error - for instance, with http://nus.cdn.t.shop.nintendowifi.net/ccs/download/0000000000000000/00000000 you get something akin to the following:

[[File:NUS-Screenshot-0000000000000000-00000000.png]]

(response header has 404 in status code, with Last-Modified field indicating that this page is generated on the fly)

The text in the square brackets appears to be some kind of server file id. Note that if you request a nonexistent cetk, it's server file id is reported as 4294967293 (0xFFFFFFFD).

[[File:NUS-Screenshot-0000000000000000-cetk.png]]

(with http://nus.cdn.t.shop.nintendowifi.net/ccs/download/0000000000000000/cetk)

Through this, we guessed that cetks do in fact have content IDs, and it turns out tmds also do, although if you request a tmd (either as "tmd" or "tmd.[version]", the server file ID is not reported by the error message (see [[#Special Content IDs]] for more info).

[[File:NUS-Screenshot-0000000000000000-tmd.png]]

(with http://nus.cdn.t.shop.nintendowifi.net/ccs/download/0000000000000000/tmd)

The function used for the server file ID is as follows:


[[File:Server-File-ID-Equation.png]]

Where '''t''' is the title ID, and '''c''' is the content ID.

== Special Content IDs ==
=== FFFD0000 ===
DSi Shop content starts at '''FFFD0000''' and increments up. This content is often icons and screenshots, (typically GIF or BMP interchangeably), with some ZIP file manuals for system titles mixed in as well.

=== FFFEFFFF ===
tmd content is stored at this content ID. The very first version is '''FFFEFFFF''', and subsequent versions decrement the value (second version is '''FFFEFFFE''', third is '''FFFEFFFD''', etc.).
Because tmd versions aren't sequential, this sequential versioning allows us to check if any versions have been deleted from the CDN.
No titles were found to have deleted versions.

=== FFFFFFFD ===
This is the content ID of cetk, if it exists for a given title.

=== FFFFFFFE ===
This is a file that exists for every existing title, however it is always 0 bytes in size.
We suspect it is used as a way of checking if a title exists on the CDN, since no other files have unchanging, consistent names (tmd kind of does, but we suspect it's auto-generated as the latest version - the file "tmd" probably doesn't exist on the server).

File:Server-File-ID-Equation.png

2020-11-17T23:50:37Z

Zedseven: The equation used to calculate the internal server file ID from a title ID and content ID. '''t''' is the title ID, and '''c''' is the content ID. The LaTeX for this is as follows: <pre>f_{serverId}\left(t,c\right) = t \cdot \texttt{0x100000000} + c</pre>

== Summary ==
The equation used to calculate the internal server file ID from a title ID and content ID. '''t''' is the title ID, and '''c''' is the content ID.

The LaTeX for this is as follows:
<pre>f_{serverId}\left(t,c\right) = t \cdot \texttt{0x100000000} + c</pre>

File:NUS-Screenshot-0000000000000000-tmd.png

2020-11-17T23:48:52Z

Zedseven: A screenshot of the error message the NUS gives for a missing file 'tmd'.

== Summary ==
A screenshot of the error message the NUS gives for a missing file 'tmd'.

File:NUS-Screenshot-0000000000000000-cetk.png

2020-11-17T23:48:28Z

Zedseven: A screenshot of the error message the NUS gives for a missing file 'cetk'. This image is important because it inadvertently displays the internal content ID of a cetk file.

== Summary ==
A screenshot of the error message the NUS gives for a missing file 'cetk'. This image is important because it inadvertently displays the internal content ID of a cetk file.

File:NUS-Screenshot-0000000000000000-00000000.png

2020-11-17T23:47:19Z

Zedseven: /* Summary */

== Summary ==
A screenshot of the error message the NUS gives for a missing file '00000000'.

File:NUS-Screenshot-0000000000000000-00000000.png

2020-11-17T23:46:32Z

Zedseven: A screenshot of the error message the NUS gives for a missing title.

== Summary ==
A screenshot of the error message the NUS gives for a missing title.