From efa2a5796ef06fd035bd58a573c249f90a141ead Mon Sep 17 00:00:00 2001
From: Behdad Esfahbod <behdad@behdad.org>
Date: Tue, 24 May 2022 16:24:00 -0600
Subject: [PATCH] [map] Add hb_map_copy()

New API:
+ hb_map_copy()
---
 docs/harfbuzz-sections.txt |  1 +
 src/hb-map.cc              | 19 +++++++++++++++++++
 src/hb-map.h               |  3 +++
 src/hb-set.cc              |  1 +
 4 files changed, 24 insertions(+)

diff --git a/docs/harfbuzz-sections.txt b/docs/harfbuzz-sections.txt
index c08b067e5..d02909784 100644
--- a/docs/harfbuzz-sections.txt
+++ b/docs/harfbuzz-sections.txt
@@ -453,6 +453,7 @@ hb_icu_script_to_script
 HB_MAP_VALUE_INVALID
 hb_map_allocation_successful
 hb_map_clear
+hb_map_copy
 hb_map_create
 hb_map_del
 hb_map_destroy
diff --git a/src/hb-map.cc b/src/hb-map.cc
index de36bc1de..7335ff421 100644
--- a/src/hb-map.cc
+++ b/src/hb-map.cc
@@ -172,6 +172,25 @@ hb_map_allocation_successful (const hb_map_t  *map)
   return map->successful;
 }
 
+/**
+ * hb_map_copy:
+ * @map: A map
+ *
+ * Allocate a copy of @map.
+ *
+ * Return value: Newly-allocated map.
+ *
+ * Since: REPLACEME
+ **/
+hb_map_t *
+hb_map_copy (const hb_map_t *map)
+{
+  hb_map_t *copy = hb_map_create ();
+  if (unlikely (!copy)) return nullptr;
+  copy->resize (map->population);
+  hb_copy (*map, *copy);
+  return copy;
+}
 
 /**
  * hb_map_set:
diff --git a/src/hb-map.h b/src/hb-map.h
index b45f11ef9..41d877d6a 100644
--- a/src/hb-map.h
+++ b/src/hb-map.h
@@ -82,6 +82,9 @@ hb_map_get_user_data (hb_map_t           *map,
 HB_EXTERN hb_bool_t
 hb_map_allocation_successful (const hb_map_t *map);
 
+HB_EXTERN hb_map_t *
+hb_map_copy (const hb_map_t *map);
+
 HB_EXTERN void
 hb_map_clear (hb_map_t *map);
 
diff --git a/src/hb-set.cc b/src/hb-set.cc
index d5d44d92a..42788b2bc 100644
--- a/src/hb-set.cc
+++ b/src/hb-set.cc
@@ -186,6 +186,7 @@ hb_set_t *
 hb_set_copy (const hb_set_t *set)
 {
   hb_set_t *copy = hb_set_create ();
+  if (unlikely (!copy)) return nullptr;
   copy->set (*set);
   return copy;
 }