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/* The 'length' argument to Pointer_stringify doesn't work if the input includes
* 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;
function InboundGroupSession() {
var size = Module['_olm_inbound_group_session_size']();
this.buf = malloc(size);
this.ptr = Module['_olm_inbound_group_session'](this.buf);
}
function inbound_group_session_method(wrapped) {
return function() {
var result = wrapped.apply(this, arguments);
if (result === OLM_ERROR) {
var message = Pointer_stringify(
Module['_olm_inbound_group_session_last_error'](arguments[0])
);
throw new Error("OLM." + message);
}
return result;
}
}
InboundGroupSession.prototype['free'] = function() {
Module['_olm_clear_inbound_group_session'](this.ptr);
free(this.ptr);
}
InboundGroupSession.prototype['pickle'] = restore_stack(function(key) {
var key_array = array_from_string(key);
var pickle_length = inbound_group_session_method(
Module['_olm_pickle_inbound_group_session_length']
)(this.ptr);
var key_buffer = stack(key_array);
var pickle_buffer = stack(pickle_length + NULL_BYTE_PADDING_LENGTH);
inbound_group_session_method(Module['_olm_pickle_inbound_group_session'])(
this.ptr, key_buffer, key_array.length, pickle_buffer, pickle_length
);
return Pointer_stringify(pickle_buffer);
});
InboundGroupSession.prototype['unpickle'] = restore_stack(function(key, pickle) {
var key_array = array_from_string(key);
var key_buffer = stack(key_array);
var pickle_array = array_from_string(pickle);
var pickle_buffer = stack(pickle_array);
inbound_group_session_method(Module['_olm_unpickle_inbound_group_session'])(
this.ptr, key_buffer, key_array.length, pickle_buffer,
pickle_array.length
);
});
InboundGroupSession.prototype['create'] = restore_stack(function(message_index, session_key) {
var key_array = array_from_string(session_key);
var key_buffer = stack(key_array);
inbound_group_session_method(Module['_olm_init_inbound_group_session'])(
this.ptr, message_index, key_buffer, key_array.length
);
});
InboundGroupSession.prototype['decrypt'] = restore_stack(function(
message
) {
var message_array = array_from_string(message);
var message_buffer = stack(message_array);
var max_plaintext_length = inbound_group_session_method(
Module['_olm_group_decrypt_max_plaintext_length']
)(this.ptr, message_buffer, message_array.length);
// caculating the length destroys the input buffer.
// So we copy the array to a new buffer
var message_buffer = stack(message_array);
var plaintext_buffer = stack(max_plaintext_length + NULL_BYTE_PADDING_LENGTH);
var plaintext_length = inbound_group_session_method(Module["_olm_group_decrypt"])(
this.ptr,
message_buffer, message_array.length,
plaintext_buffer, max_plaintext_length
);
// Pointer_stringify requires a null-terminated argument (the optional
// 'len' argument doesn't work for UTF-8 data).
Module['setValue'](
plaintext_buffer+plaintext_length,
0, "i8"
);
return Pointer_stringify(plaintext_buffer);
});
olm_exports['InboundGroupSession'] = InboundGroupSession;
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