From a1ea3d4ec7a5fdd1d16df089ecb6d9b197925c8a Mon Sep 17 00:00:00 2001
From: Vincent Rischmann
Date: Sat, 17 Sep 2022 20:41:58 +0200
Subject: examples: add the zigcrypto loadable extension example

---
 examples/zigcrypto.zig | 59 ++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 examples/zigcrypto.zig

(limited to 'examples/zigcrypto.zig')

diff --git a/examples/zigcrypto.zig b/examples/zigcrypto.zig
new file mode 100644
index 0000000..05c44a5
--- /dev/null
+++ b/examples/zigcrypto.zig
@@ -0,0 +1,59 @@
+const std = @import("std");
+const Blake3 = std.crypto.hash.Blake3;
+const Sha3_512 = std.crypto.hash.sha3.Sha3_512;
+
+const sqlite = @import("sqlite");
+const c = sqlite.c;
+
+const name = "zigcrypto";
+
+pub const loadable_extension = true;
+
+var module_allocator: std.heap.GeneralPurposeAllocator(.{}) = undefined;
+var module_context: sqlite.vtab.ModuleContext = undefined;
+
+const logger = std.log.scoped(.zigcrypto);
+
+fn createAllFunctions(db: *sqlite.Db) !void {
+    try db.createScalarFunction(
+        "blake3",
+        struct {
+            fn run(input: []const u8) [Blake3.digest_length]u8 {
+                var output: [Blake3.digest_length]u8 = undefined;
+                Blake3.hash(input, output[0..], .{});
+                return output;
+            }
+        }.run,
+        .{},
+    );
+    try db.createScalarFunction(
+        "sha3_512",
+        struct {
+            fn run(input: []const u8) [Sha3_512.digest_length]u8 {
+                var output: [Sha3_512.digest_length]u8 = undefined;
+                Sha3_512.hash(input, output[0..], .{});
+                return output;
+            }
+        }.run,
+        .{},
+    );
+}
+
+pub export fn sqlite3_zigcrypto_init(raw_db: *c.sqlite3, err_msg: [*c][*c]u8, api: *c.sqlite3_api_routines) callconv(.C) c_int {
+    _ = err_msg;
+
+    c.sqlite3_api = api;
+
+    module_allocator = std.heap.GeneralPurposeAllocator(.{}){};
+
+    var db = sqlite.Db{
+        .db = raw_db,
+    };
+
+    createAllFunctions(&db) catch |err| {
+        logger.err("unable to create all SQLite functions, err: {!}", .{err});
+        return c.SQLITE_ERROR;
+    };
+
+    return c.SQLITE_OK;
+}
-- 
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