From e3c5be0a33e66b124ff261479cffa9f95ce53dc0 Mon Sep 17 00:00:00 2001
From: Martin Ashby <martin@ashbysoft.com>
Date: Sat, 11 Nov 2023 22:17:31 +0000
Subject: Make request to tracker, get and parse response to find peers list

---
 src/metainfo.zig | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

(limited to 'src/metainfo.zig')

diff --git a/src/metainfo.zig b/src/metainfo.zig
index 29cc655..cd00438 100644
--- a/src/metainfo.zig
+++ b/src/metainfo.zig
@@ -63,9 +63,13 @@ pub const Info = struct {
             const pri = pr.asInt(u1) catch return error.Malformatted;
             priv = pri == 1;
         }
+        // Validation....
+        const ps = pp.asString() catch return error.Malformatted;
+        if (ps.len % 20 != 0) return error.Malformatted;
+
         return .{
             .piece_length = pl.asInt(u64) catch return error.Malformatted,
-            .pieces = pp.asString() catch return error.Malformatted,
+            .pieces = ps,
             .files = try files.toOwnedSlice(),
             .private = priv,
         };
@@ -112,6 +116,11 @@ pub const Info = struct {
         try b.bencode(w);
         return sha1.finalResult();
     }
+    pub fn pieceHash(self: Info, ix: usize) ?[]const u8 {
+        const start = 20 * ix;
+        if (start >= self.pieces.len) return null;
+        return self.pieces[start .. start + 20];
+    }
 };
 
 info: Info,
-- 
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