1 files changed, 61 insertions, 0 deletions
diff --git a/mpvcore/mp_talloc.h b/mpvcore/mp_talloc.h
new file mode 100644
index 0000000000..1dcb0bce07
--- /dev/null
+++ b/mpvcore/mp_talloc.h
@@ -0,0 +1,61 @@
+/*
+ * This file is part of mpv.
+ *
+ * mpv is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * mpv is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with mpv; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPV_TALLOC_H
+#define MPV_TALLOC_H
+
+#include "talloc.h"
+#include "compat/compiler.h"
+
+#define MP_TALLOC_ELEMS(p) (talloc_get_size(p) / sizeof((p)[0]))
+#define MP_GROW_ARRAY(p, nextidx) do {          \
+    if ((nextidx) == MP_TALLOC_ELEMS(p))        \
+        (p) = talloc_realloc_size(NULL, p, talloc_get_size(p) * 2); } while (0)
+#define MP_RESIZE_ARRAY(ctx, p, count) do {     \
+        (p) = talloc_realloc_size((ctx), p, (count) * sizeof((p)[0])); } while (0)
+
+#define MP_TARRAY_GROW(ctx, p, nextidx)             \
+    do {                                            \
+        size_t nextidx_ = (nextidx);                \
+        size_t nelems_ = MP_TALLOC_ELEMS(p);        \
+        if (nextidx_ >= nelems_)                    \
+            (p) = talloc_realloc_size(ctx, p,       \
+                  (nextidx_ + 1) * sizeof((p)[0]) * 2);\
+    } while (0)
+
+#define MP_TARRAY_APPEND(ctx, p, idxvar, ...)       \
+    do {                                            \
+        MP_TARRAY_GROW(ctx, p, idxvar);             \
+        (p)[(idxvar)] = (MP_EXPAND_ARGS(__VA_ARGS__));\
+        (idxvar)++;                                 \
+    } while (0)
+
+// Doesn't actually free any memory, or do any other talloc calls.
+#define MP_TARRAY_REMOVE_AT(p, idxvar, at)          \
+    do {                                            \
+        size_t at_ = (at);                          \
+        assert(at_ <= (idxvar));                    \
+        memmove((p) + at_, (p) + at_ + 1,           \
+                ((idxvar) - at_ - 1) * sizeof((p)[0])); \
+        (idxvar)--;                                 \
+    } while (0)
+
+#define talloc_struct(ctx, type, ...) \
+    talloc_memdup(ctx, &(type) MP_EXPAND_ARGS(__VA_ARGS__), sizeof(type))
+
+#endif