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1const std = @import("std");
2
3pub fn encodeAlloc(allocator: std.mem.Allocator, bytes: []const u8) ![]u8 {
4 const len = std.base64.url_safe_no_pad.Encoder.calcSize(bytes.len);
5 const out = try allocator.alloc(u8, len);
6 _ = std.base64.url_safe_no_pad.Encoder.encode(out, bytes);
7 return out;
8}
9
10pub fn decodeAlloc(allocator: std.mem.Allocator, text: []const u8) ![]u8 {
11 const len = std.base64.url_safe_no_pad.Decoder.calcSizeForSlice(text) catch {
12 return error.InvalidBase64Url;
13 };
14 const out = try allocator.alloc(u8, len);
15 errdefer allocator.free(out);
16 std.base64.url_safe_no_pad.Decoder.decode(out, text) catch {
17 return error.InvalidBase64Url;
18 };
19 return out;
20}
21
22test "round trips unpadded base64url" {
23 const allocator = std.testing.allocator;
24 const encoded = try encodeAlloc(allocator, "hello?");
25 defer allocator.free(encoded);
26 try std.testing.expectEqualStrings("aGVsbG8_", encoded);
27
28 const decoded = try decodeAlloc(allocator, encoded);
29 defer allocator.free(decoded);
30 try std.testing.expectEqualStrings("hello?", decoded);
31}