Mp4: fixed setting wrong mdat atom size in very rare cases.
Atom size is the sum of atom header size and atom data size. The
specification says that the first 4 bytes are set to one when
the atom size is greater than the maximum unsigned 32-bit value.
Which means atom header size should be considered when the
comparison takes place between atom data size and 0xffffffff.
diff --git a/src/http/modules/ngx_http_mp4_module.c b/src/http/modules/ngx_http_mp4_module.c
index 8f2920f..f3c0fdd 100644
--- a/src/http/modules/ngx_http_mp4_module.c
+++ b/src/http/modules/ngx_http_mp4_module.c
@@ -1229,7 +1229,9 @@
atom_header = mp4->mdat_atom_header;
- if ((uint64_t) atom_data_size > (uint64_t) 0xffffffff) {
+ if ((uint64_t) atom_data_size
+ > (uint64_t) 0xffffffff - sizeof(ngx_mp4_atom_header_t))
+ {
atom_size = 1;
atom_header_size = sizeof(ngx_mp4_atom_header64_t);
ngx_mp4_set_64value(atom_header + sizeof(ngx_mp4_atom_header_t),
