From 454f75cb2288e171cd4d40879938ea970e3b9019 Mon Sep 17 00:00:00 2001
From: rykad <>
Date: Sat, 17 Jan 2026 22:26:25 +0000
Subject: [PATCH] core:encoding/base64: add support for url variant

---
 core/encoding/base64/base64.odin       | 49 ++++++++++++++++++++++++++
 tests/core/encoding/base64/base64.odin | 17 ++++++++-
 2 files changed, 65 insertions(+), 1 deletion(-)

diff --git a/core/encoding/base64/base64.odin b/core/encoding/base64/base64.odin
index 032716bde..0677fdfb7 100644
--- a/core/encoding/base64/base64.odin
+++ b/core/encoding/base64/base64.odin
@@ -24,6 +24,18 @@ ENC_TABLE := [64]byte {
     '4', '5', '6', '7', '8', '9', '+', '/',
 }
 
+// Encoding table for Base64url variant
+ENC_URL_TABLE := [64]byte {
+    'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
+    'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
+    'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
+    'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
+    'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
+    'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
+    'w', 'x', 'y', 'z', '0', '1', '2', '3',
+    '4', '5', '6', '7', '8', '9', '-', '_',
+}
+
 PADDING :: '='
 
 DEC_TABLE := [256]u8 {
@@ -61,6 +73,43 @@ DEC_TABLE := [256]u8 {
      0,  0,  0,  0,  0,  0,  0,  0,
 }
 
+// Decoding table for Base64url variant
+DEC_URL_TABLE := [256]u8 {
+     0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0, 62,  0,  0,
+    52, 53, 54, 55, 56, 57, 58, 59,
+    60, 61,  0,  0,  0,  0,  0,  0,
+     0,  0,  1,  2,  3,  4,  5,  6,
+     7,  8,  9, 10, 11, 12, 13, 14,
+    15, 16, 17, 18, 19, 20, 21, 22,
+    23, 24, 25,  0,  0,  0,  0, 63,
+     0, 26, 27, 28, 29, 30, 31, 32,
+    33, 34, 35, 36, 37, 38, 39, 40,
+    41, 42, 43, 44, 45, 46, 47, 48,
+    49, 50, 51,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,
+     0,  0,  0,  0,  0,  0,  0,  0,
+}
+
+
 encode :: proc(data: []byte, ENC_TBL := ENC_TABLE, allocator := context.allocator) -> (encoded: string, err: mem.Allocator_Error) #optional_allocator_error {
 	out_length := encoded_len(data)
 	if out_length == 0 {
diff --git a/tests/core/encoding/base64/base64.odin b/tests/core/encoding/base64/base64.odin
index ed1bee8af..93b3afb59 100644
--- a/tests/core/encoding/base64/base64.odin
+++ b/tests/core/encoding/base64/base64.odin
@@ -50,4 +50,19 @@ test_roundtrip :: proc(t: ^testing.T) {
 	for v, i in decoded {
 		testing.expect_value(t, v, values[i])
 	}
-}
\ No newline at end of file
+}
+
+@(test)
+test_base64url :: proc(t: ^testing.T) {
+	plain := ">>>"
+	url := "Pj4-"
+
+	encoded := base64.encode(transmute([]byte)plain, base64.ENC_URL_TABLE)
+	defer delete(encoded)
+	testing.expect_value(t, encoded, url)
+
+	decoded := string(base64.decode(url, base64.DEC_URL_TABLE))
+	defer delete(decoded)
+	testing.expect_value(t, decoded, plain)
+
+}