base64 C library

C library which can encode bytes to base64 strings and base64 strings to bytes. Because the resulting length is precalculated only one malloc call is used per function.

How to use

Strings

#include <base64.h>

int main(void)
{
    const char* string = "hello world";
    const char* expected = "aGVsbG8gd29ybGQ=";
    char* encoded = base64_encode(string, strlen(string));
    //true for C string '\0'
    char* decoded = base64_decode(encoded, B64_TRUE);
    
    assert(streq(string, decoded));
    assert(streq(expected, encoded));
    
    free(encoded);
    free(decoded);
    
    return 0;
}

Structs

#include <base64.h>

int main(void)
{
    struct TestStruct
    {
    	unsigned int a;
    	int b;
    	float c;
    	double d;
    };
    
    struct TestStruct test;
    test.a = 20;
    test.b = -123;
    test.c = -0.123f;
    test.d = 1234.123456789;
    
    char* encoded = base64_encode(&test, sizeof(struct TestStruct));
    //false because it is no string
    struct TestStruct* decoded = base64_decode(encoded, B64_FALSE);
    
    assert(decoded->a == test.a);
    assert(decoded->b == test.b);
    assert(decoded->c == test.c);
    assert(decoded->d == test.d);
    
    free(encoded);
    free(decoded);
    return 0;
}

Build

Project uses CMake.

You can include this project as a submodule:

git submodule add "https://github.com/Seng3694/base64"

And then add the directory to your CMakeLists:

add_subdirectory(base64)

And link it with your application:

target_link_libraries(YOUR_TARGET base64)

Or just embed it manually.

License

This library is licensed under the MIT License. See LICENSE for more information.