Reject RLE-compressed BMP files

Author: dhalbert

locale/circuitpython.pot

@@ -1832,6 +1832,10 @@ msgstr ""
 msgid "RISE_AND_FALL not available on this chip"
 msgstr ""
 
+#: shared-module/displayio/OnDiskBitmap.c
+msgid "RLE-compressed BMP not supported"
+msgstr ""
+
 #: ports/stm/common-hal/os/__init__.c
 msgid "RNG DeInit Error"
 msgstr ""
@@ -1993,10 +1997,6 @@ msgstr ""
 msgid "Stereo right must be on PWM channel B"
 msgstr ""
 
-#: ports/raspberrypi/common-hal/wifi/Radio.c
-msgid "Stopping AP is not supported."
-msgstr ""
-
 #: shared-bindings/alarm/time/TimeAlarm.c
 msgid "Supply one of monotonic_time or epoch_time"
 msgstr ""

shared-module/displayio/OnDiskBitmap.c

@@ -61,6 +61,11 @@ void common_hal_displayio_ondiskbitmap_construct(displayio_ondiskbitmap_t *self,
     uint32_t compression = read_word(bmp_header, 15);
     uint32_t number_of_colors = read_word(bmp_header, 23);
 
+    // 0 is uncompressed; 3 is bitfield compressed. 1 and 2 are RLE compression.
+    if (compression != 0 && compression != 3) {
+        mp_raise_ValueError(MP_ERROR_TEXT("RLE-compressed BMP not supported"));
+    }
+
     bool indexed = bits_per_pixel <= 8;
     self->bitfield_compressed = (compression == 3);
     self->bits_per_pixel = bits_per_pixel;