mbedtls 0.13.5

Idiomatic Rust wrapper for MbedTLS, allowing you to use MbedTLS with only safe code while being able to use such great Rust features like error handling and closures. Building on MbedTLS's focus on embedded use, this crate can be used in a no_std environment.
Documentation 
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/* Copyright (c) Fortanix, Inc.
 *
 * Licensed under the GNU General Public License, version 2 <LICENSE-GPL or
 * https://www.gnu.org/licenses/gpl-2.0.html> or the Apache License, Version
 * 2.0 <LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0>, at your
 * option. This file may not be copied, modified, or distributed except
 * according to those terms. */

// Follow same pattern for config and alloc/free as everywhere in mbedtls
#if !defined(MBEDTLS_CONFIG_FILE)
#include "mbedtls/config.h"
#else
#include MBEDTLS_CONFIG_FILE
#endif

#if defined(MBEDTLS_PLATFORM_C)
#include "mbedtls/platform.h"
#else
#include <stdlib.h>
#define mbedtls_calloc    calloc
#define mbedtls_free      free
#endif

// Use several macros to get the preprocessor to actually replace RUST_MBEDTLS_SYMBOL_SUFFIX.
// This code handles cases where `mbedtls_calloc` and `mbedtls_free` may be macros instead of functions,
// which Bindgen has trouble with. The `APPEND_METADATA_HASH` macro appends a suffix from `RUST_MBEDTLS_SYMBOL_SUFFIX`
// to ensure proper symbol linkage, regardless of whether the original mbedtls functions are macros or symbols.
#define append_macro_inner(a, b) a##_##b
#define append_macro(a, b) append_macro_inner(a, b)
#define APPEND_METADATA_HASH(f) append_macro(f, RUST_MBEDTLS_SYMBOL_SUFFIX)

extern void *APPEND_METADATA_HASH(forward_mbedtls_calloc)( size_t n, size_t size ) {
    return mbedtls_calloc(n, size);
}

extern void APPEND_METADATA_HASH(forward_mbedtls_free)( void *ptr ) {
    mbedtls_free(ptr);
}