1 files changed, 21 insertions, 7 deletions
diff --git a/src/packet_storage.c b/src/packet_storage.c
index 5781661..922cc45 100644
--- a/src/packet_storage.c
+++ b/src/packet_storage.c
@@ -141,17 +141,31 @@ void save_author_packet_hash(const public_key author, const hash packet_hash) {
     const char *dir = "packets_by_author";
     mkdir(dir, 0755);
 
-    char author_hex[ 65 ];
+    char author_hex[65];
     sprintf(author_hex, hash_fmt, hash_ref(author));
 
-    char filename[ 256 ];
+    char filename[256];
     snprintf(filename, sizeof(filename), "%s/%s.list", dir, author_hex);
 
-    FILE *f = fopen(filename, "ab");
-    if (!f) return;
-    fwrite(packet_hash, 32, 1, f);
-    fputc('\n', f);
-    fclose(f);
+    FILE *f = fopen(filename, "rb");
+    if (f) {
+        unsigned char buf[64];
+        while (fread(buf, 1, 64, f) >= 32) {
+            int c = fgetc(f);
+            (void)c;
+            if (memcmp(buf, packet_hash, 32) == 0) {
+                fclose(f);
+                return;
+            }
+        }
+        fclose(f);
+    }
+
+    FILE *fa = fopen(filename, "ab");
+    if (!fa) return;
+    fwrite(packet_hash, 32, 1, fa);
+    fputc('\n', fa);
+    fclose(fa);
 }
 
 void save_recipient_packet_hash(const recipient recipient, const hash packet_hash) {