From 79f792e090330a05753f9edb27332a946eb0840d Mon Sep 17 00:00:00 2001
From: fiaxh <git@lightrise.org>
Date: Sat, 2 Nov 2024 22:24:59 +0100
Subject: Fix and improve stateless file-sharing

---
 libdino/src/util/util.vala | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

(limited to 'libdino/src/util/util.vala')

diff --git a/libdino/src/util/util.vala b/libdino/src/util/util.vala
index 9f7ae45f..31f4c105 100644
--- a/libdino/src/util/util.vala
+++ b/libdino/src/util/util.vala
@@ -1,3 +1,6 @@
+using Gee;
+using Xmpp;
+
 namespace Dino {
 
 private extern const string SYSTEM_LIBDIR_NAME;
@@ -90,4 +93,32 @@ public static void internationalize(string gettext_package, string locales_dir)
     Intl.bindtextdomain(gettext_package, locales_dir);
 }
 
+public static async HashMap<ChecksumType, string> compute_file_hashes(File file, Gee.List<ChecksumType> checksum_types) {
+    var checksums = new Checksum[checksum_types.size];
+
+    for (int i = 0; i < checksum_types.size; i++) {
+        checksums[i] = new Checksum(checksum_types.get(i));
+    }
+
+    FileInputStream stream = yield file.read_async();
+    uint8 fbuf[1024];
+    size_t size;
+    while ((size = yield stream.read_async(fbuf)) > 0) {
+        for (int i = 0; i < checksum_types.size; i++) {
+            checksums[i].update(fbuf, size);
+        }
+    }
+
+    var ret = new HashMap<ChecksumType, string>();
+    for (int i = 0; i < checksum_types.size; i++) {
+        var checksum_type = checksum_types.get(i);
+        uint8[] digest = new uint8[64];
+        size_t length = digest.length;
+        checksums[i].get_digest(digest, ref length);
+        string computed_hash = GLib.Base64.encode(digest[0:length]);
+        ret[checksum_type] = computed_hash;
+    }
+    return ret;
+}
+
 }
-- 
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