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imwayland: Respect maximum length of 4000 Bytes on strings being sent.

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Hitting the limit will raise protocol errors.
This commit is contained in:
Carlos Garnacho 2018-12-06 17:05:43 +01:00
parent 5e127cff12
commit e416aebe5f
1 changed files with 63 additions and 3 deletions
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66
modules/input/imwayland.c
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@ -342,6 +342,11 @@ gtk_im_context_wayland_global_init (GdkDisplay *display)
static void
notify_surrounding_text (GtkIMContextWayland *context)
{
#define MAX_LEN 4000
const gchar *start, *end;
int len, cursor, anchor;
char *str = NULL;
if (!global || !global->text_input)
return;
if (global->current != GTK_IM_CONTEXT (context))
@ -349,12 +354,67 @@ notify_surrounding_text (GtkIMContextWayland *context)
if (!context->surrounding.text)
return;
len = strlen (context->surrounding.text);
cursor = context->surrounding.cursor_idx;
anchor = context->surrounding.anchor_idx;
/* The protocol specifies a maximum length of 4KiB on transfers,
* mangle the surrounding text if it's bigger than that, and relocate
* cursor/anchor locations as per the string being sent.
*/
if (len > MAX_LEN)
{
if (context->surrounding.cursor_idx < MAX_LEN &&
context->surrounding.anchor_idx < MAX_LEN)
{
start = context->surrounding.text;
end = &context->surrounding.text[MAX_LEN];
}
else if (context->surrounding.cursor_idx > len - MAX_LEN &&
context->surrounding.cursor_idx > len - MAX_LEN)
{
start = &context->surrounding.text[len - MAX_LEN];
end = &context->surrounding.text[len];
}
else
{
int mid, a, b;
int cursor_len = ABS (context->surrounding.cursor_idx -
context->surrounding.anchor_idx);
if (cursor_len > MAX_LEN)
{
g_warn_if_reached ();
return;
}
mid = MIN (context->surrounding.cursor_idx,
context->surrounding.cursor_idx) + (cursor_len / 2);
a = MAX (0, mid - (MAX_LEN / 2));
b = MIN (MAX_LEN, mid + (MAX_LEN / 2));
start = &context->surrounding.text[a];
end = &context->surrounding.text[b];
}
if (start != context->surrounding.text)
start = g_utf8_next_char (start);
if (end != &context->surrounding.text[len])
end = g_utf8_find_prev_char (context->surrounding.text, end);
cursor -= start - context->surrounding.text;
anchor -= start - context->surrounding.text;
str = g_strndup (start, end - start);
}
zwp_text_input_v3_set_surrounding_text (global->text_input,
context->surrounding.text,
context->surrounding.cursor_idx,
context->surrounding.anchor_idx);
str ? str : context->surrounding.text,
cursor, anchor);
zwp_text_input_v3_set_text_change_cause (global->text_input,
context->surrounding_change);
g_free (str);
#undef MAX_LEN
}
static void