Helper function to check if stored box size is correct and looks
to be fully available.
---
libavformat/mov.c | 32 ++++++++++++++++++++++++++++++++
1 file changed, 32 insertions(+)
diff --git a/libavformat/mov.c b/libavformat/mov.c
index 2aed6e80ef..2cc9e699de 100644
--- a/libavformat/mov.c
+++ b/libavformat/mov.c
@@ -80,6 +80,38 @@ static int mov_read_mfra(MOVContext *c, AVIOContext *f);
static int64_t add_ctts_entry(MOVCtts** ctts_data, unsigned int* ctts_count,
unsigned int* allocated_size,
int count, int duration);
+/** Check if the box size meets the requirements passed in limit and
constraint_type.
+ * If input avio_size is valid, it checks if box size appears to be
available.
+ *
+ * constraint_type may be
+ * 0 if the box size has to be exactly equal to limit
+ * -1 if the box size has to be at most limit
+ * 1 if the box size has to be at least limit
+ *
+ * Returns 0 if size meets requirements.
+ */
+static int validate_box_size(MOVContext *c, MOVAtom atom, AVIOContext *pb,
+ int64_t pos, int64_t limit, int constraint_type)
+{
+ int size_fit;
+ int64_t input_size = avio_size(pb);
+
+ if (input_size > 0 &&
+ input_size - pos < atom.size) {
+ av_log(c->fc, AV_LOG_ERROR, "Box %s is truncated\n",
av_fourcc2str(atom.type));
+ return AVERROR_INVALIDDATA;
+ }
+
+ switch(constraint_type) {
+ case 0: size_fit = atom.size == limit; break;
+ case -1: size_fit = atom.size <= limit; break;
+ case 1: size_fit = atom.size >= limit; break;
+ default: return AVERROR_INVALIDDATA;
+ }
+
+ return !size_fit;
+}
+
static int mov_metadata_track_or_disc_number(MOVContext *c, AVIOContext *pb,
unsigned len, const char *key)
{
--
2.33.0
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