Add password_message

1 files changed, 44 insertions, 0 deletions

diff --git a/src/password_message.zig b/src/password_message.zig
new file mode 100644
index 0000000..33214bf
--- /dev/null
+++ b/src/password_message.zig
@@ -0,0 +1,44 @@
+const std = @import("std");
+const ByteArrayList = std.ArrayList(u8);
+const PasswordMessage = @This();
+
+pub const Tag: u8 = 'p';
+password: []const u8,
+password_owned: bool = false,
+
+
+pub fn read(allocator: std.mem.Allocator, b: []const u8) !PasswordMessage {
+    return .{ .password = try allocator.dupe(u8, b), .password_owned = true };
+}
+pub fn write(self: PasswordMessage, _: std.mem.Allocator, stream_writer: anytype) !void {
+    try stream_writer.writeByte(Tag);
+    try stream_writer.writeIntBig(u32, 5 + @as(u32, @intCast(self.password.len)));
+    try stream_writer.writeAll(self.password);
+    try stream_writer.writeByte(0);
+}
+pub fn deinit(self: *PasswordMessage, allocator: std.mem.Allocator) void {
+    if (self.password_owned) allocator.free(self.password);
+}
+
+test "round trip" {
+    const allocator = std.testing.allocator;
+    var sm = PasswordMessage{
+        .password = "foobar",
+    };
+    defer sm.deinit(allocator);
+
+    var bal = ByteArrayList.init(allocator);
+    defer bal.deinit();
+    try sm.write(allocator, bal.writer());
+
+    var fbs = std.io.fixedBufferStream(bal.items);
+    var reader = fbs.reader();
+    const tag = try reader.readByte();
+    try std.testing.expectEqual(Tag, tag);
+    const len = try reader.readIntBig(u32);
+    const buf = try allocator.alloc(u8, len - 4);
+    defer allocator.free(buf);
+    try reader.readNoEof(buf);
+    var sm2 = try PasswordMessage.read(allocator, buf);
+    defer sm2.deinit(allocator);
+}