Add core decoder excessive frame size workaround.

Certain DTS in WAV streams have core frame size stored in header one
byte larger than actual distance between sync words. Because of this
overread check based on frame size always fails. Work this around by
checking overread against the size of provided data in case frame size
is larger.

Internal stream parser is yet to be fixed to make such files work.

libdcadec/core_decoder.c

@@ -2031,6 +2031,7 @@ int core_parse(struct core_decoder *core, uint8_t *data, size_t size,
         bits_init(&core->bits, data + asset->core_offset, asset->core_size);
         if (bits_get(&core->bits, 32) != SYNC_WORD_CORE_EXSS)
             return -DCADEC_ENOSYNC;
+        size = asset->core_size;
     } else {
         bits_init(&core->bits, data, size);
         bits_skip(&core->bits, 32);
@@ -2045,6 +2046,8 @@ int core_parse(struct core_decoder *core, uint8_t *data, size_t size,
         return ret;
     if ((ret = parse_optional_info(core, flags)) < 0)
         return ret;
+    if (core->frame_size > size)
+        core->frame_size = size;
     if ((ret = bits_seek(&core->bits, core->frame_size * 8)) < 0)
         return ret;
     return 0;