Fix megolm decryption of UTF-8

Repeat the fix from b10f90d for megolm messages.

It turns out that the 'length' argument to 'Pointer_stringify' doesn't work if
the input includes characters >= 128.

Rather than try to figure out which methods can return UTF-8, and which always
return plain ascii, replace all uses of Pointer_stringify with a 'length'
argument with the version that expects a NULL-terminated input, and extend the
buffer by a byte to allow space for a null-terminator.

In the case of decrypt, we need to add the null ourself.

Fixes https://github.com/vector-im/vector-web/issues/2078.

1 files changed, 1 insertions, 1 deletions

diff --git a/javascript/olm_post.js b/javascript/olm_post.js
index 955d68d..dac89f6 100644
--- a/javascript/olm_post.js
+++ b/javascript/olm_post.js
@@ -5,7 +5,7 @@ var Pointer_stringify = Module['Pointer_stringify'];
 var OLM_ERROR = Module['_olm_error']();
 
 /* The 'length' argument to Pointer_stringify doesn't work if the input includes
- * cahracters >= 128; we therefore need to add a NULL character to all of our
+ * characters >= 128; we therefore need to add a NULL character to all of our
  * strings. This acts as a symbolic constant to help show what we're doing.
  */
 var NULL_BYTE_PADDING_LENGTH = 1;