From 6ffaa6615858a383994dadeb2ba237dd66669527 Mon Sep 17 00:00:00 2001
From: Aaron Cook <aarongregorycook@gmail.com>
Date: Sun, 21 Sep 2025 20:01:16 -0500
Subject: [PATCH] Fix parsing/printing errors on empty maps & arrays

---
 src/empack.c | 32 ++++++++++++++++++++++++++------
 1 file changed, 26 insertions(+), 6 deletions(-)

diff --git a/src/empack.c b/src/empack.c
index 2e6dd6d..24b8dd8 100644
--- a/src/empack.c
+++ b/src/empack.c
@@ -130,6 +130,11 @@ empack_parse(empack_t *empack, const void *msgpack, uint32_t len)
         {
             empack_array_t *parr = &cur->val.array;
 
+            if (parr->object_count == 0) {
+                /* nothing to do on an empty array */
+                break;
+            }
+
             parr->objects = empack_allocate(empack, sizeof(empack_obj_t) * parr->object_count);
             if (parr->objects == NULL) {
                 ret = EMPACK_STATUS_NOMEM;
@@ -147,6 +152,11 @@ empack_parse(empack_t *empack, const void *msgpack, uint32_t len)
         {
             empack_map_t *pmap = &cur->val.map;
 
+            if (pmap->pair_count == 0) {
+                /* nothing to do on an empty map */
+                break;
+            }
+
             pmap->pairs = empack_allocate(empack, sizeof(empack_map_t) * pmap->pair_count);
             if (pmap->pairs == NULL) {
                 ret = EMPACK_STATUS_NOMEM;
@@ -523,18 +533,28 @@ empack_print(empack_t *empack,
         case EMPACK_TYPE_MAP16:
         case EMPACK_TYPE_MAP32:
             EMPACK_PRINT("{", 1);
-            EMPACK_PRINT_NEWLINE();
-            cur->val.map.pairs_parsed = 0;
-            indent_depth++;
+
+            if (cur->val.map.pair_count > 0) {
+                EMPACK_PRINT_NEWLINE();
+                cur->val.map.pairs_parsed = 0;
+                indent_depth++;
+            } else {
+                EMPACK_PRINT("}", 1);
+            }
             break;
 
         case EMPACK_TYPE_FIXARRAY:
         case EMPACK_TYPE_ARRAY16:
         case EMPACK_TYPE_ARRAY32:
             EMPACK_PRINT("[", 1);
-            EMPACK_PRINT_NEWLINE();
-            cur->val.array.objects_parsed = 0;
-            indent_depth++;
+
+            if (cur->val.array.object_count > 0) {
+                EMPACK_PRINT_NEWLINE();
+                cur->val.array.objects_parsed = 0;
+                indent_depth++;
+            } else {
+                EMPACK_PRINT("]", 1);
+            }
             break;
 
         case EMPACK_TYPE_FIXSTR: