Import of the watch repository from Pebble

src/fw/util/base64.h

@@ -0,0 +1,30 @@
+/*
+ * Copyright 2024 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#pragma once
+#include <stdint.h>
+
+unsigned int base64_decode_inplace(char* buffer, unsigned int length);
+
+// Encode a buffer as base 64
+// @param out the encoded base64 string is written here
+// @param out_len the size of the out buffer
+// @param data the binary data to encode
+// @param data_len the number of bytes of binary data
+// @retval the number of characters required to encode all of the data, not including the
+//         terminating null at the end. If this is less than the passed in out_len, then
+//         NO characters will be written to the out buffer.
+int32_t base64_encode(char *out, int out_len, const uint8_t *data, int32_t data_len);