hterm: drop max-string-sequence support

We have two ways of breaking out of escape sequences: either we hit a
byte limit (default of 100k), or we timeout (default of 20s).  The byte
limit was added before the timeout was, and is largely redundant with
the timeout logic.  If someone were to set this field too low (say to
0), things would misbehave in very weird ways (and has happened to at
least one person who didn't change it on purpose).

We now have a desire to increase the byte limit, perhaps to megabytes,
as we add support for things like displaying images inline.  So lets
drop the byte limit entirely.  If we did hit an unterminated escape
sequence, we still have the timeout to fallback to.

Change-Id: I777b0bd0841bad612a5ef3a7edaf404f93a7dc9d
Reviewed-by: Brandon Gilmore <>
Tested-by: Mike Frysinger <>
4 files changed
tree: b46af559013188b2c3893178dabbfd5aff4e3dc3
  1. .gitignore
  5. hterm/
  6. libdot/
  7. nassh/
  8. package.json
  9. saltpig/
  10. ssh_client/
  11. wam/
  12. wash/


This repository contains the libdot JavaScript library and some web applications that make use of it.

The official copy of this repository is hosted at

There is also a mirror on github at Keep in mind that this mirror may occasionally be behind the official repository.

All changes must go through the Gerrit code review server on Github pull requests cannot be accepted. Please see the document in this directory for the details.

Top level directories

  • libdot/ is a small set of JS libraries initially developed as part of hterm, now available as shared code. It provides a base layer for web applications. The code is intended to work in any modern browser, in either a plain web page or a “privileged” environment such as a Chrome platform application or Firefox extension. In practice, it's only been put to use in Chrome platform applications so far.

  • hterm/ is a JS library that provides a terminal emulator. It is reasonably fast, reasonably correct, and reasonably portable across browsers.

  • nassh/ is the Secure Shell Chrome App (currently a “v1.5” app, soon to become a “v2” or platform app) that combines hterm with a NaCl build of OpenSSH to provide a PuTTY-like app for Chrome users.

  • ssh_client/ is the NaCl port of OpenSSH. It is used by nassh to create the Secure Shell App.

  • wash/ is a library for cross-origin virtual filesystems, similar to the Plan 9 filesystem. This directory also contains a simple bash-like shell environment for exploring these filesystems. The code in this directory is a work-in-progress.