src/include/b64_decode.h

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #ifndef __INCLUDE_B64_DECODE_H__
   4 #define __INCLUDE_B64_DECODE_H__
   5
   6 #include <stddef.h>
   7 #include <stdint.h>
   8
   9 /*
  10  * A function to convert a buffer of base64 format data into its source.
  11  *
  12  * The user provides output buffer of the size guaranteed to fit the result.
  13  *
  14  * Returns the size of the decoded data or zero if invalid characters were
  15  * encountered in the input buffer.
  16  */
  17 size_t b64_decode(const uint8_t *input_data,
  18                   size_t input_length,
  19                   uint8_t *output_data);
  20
  21 /* A macro to derive decoded size of a base64 encoded blob. */
  22 #define B64_DECODED_SIZE(encoded_size) (((encoded_size) * 3)/4)
  23
  24 #endif