Flesh out JS5 protocol documentation

Signed-off-by: Graham <gpe@openrs2.org>
Graham 4 years ago
parent 07603d3cfa
commit 70b35216c9
  1. 12
      share/doc/protocol/js5.md

@ -1,5 +1,10 @@
# JS5 protocol
The JS5 remote protocol is used by the client to download groups of files from
the server as they are required, as well as prefetching certain groups in
advance. Groups contain the client's assets and scripts, and are stored in the
cache.
## Upstream
| Opcode | Description |
@ -73,5 +78,8 @@ If encryption is enabled, all downstream bytes are XORed with the encryption
key. The client enables encryption if the checksum of a group does not match the
expected checksum in the master index or index.
After the first 512 bytes of a response, every subsequent block of 511 bytes is
prefixed with a single `0xFF` byte.
The encryption scheme is probably used to defend against middle boxes tampering
with the plaintext traffic.
After the first 512 bytes of a response (including the header), every subsequent
block of 511 bytes is prefixed with a single `0xFF` byte.

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