main.c

#include <stdio.h>
#include <string.h>
#include "cb64.h"

#define EXIT_ERR(msg) { \
        printf("%s\n", msg); \
        exit(-1); \
    }

int get_file_size(size_t* size, FILE* f);

int main(int argc, char** argv) 
{

	// unsigned char* input = "wur0";
	// unsigned char* dst = NULL;
	// size_t dst_size = 0;
	// int encode_ok = encode_b64(input, 0, &dst, &dst_size);
	// if (encode_ok != B64_ENCODE_OK)
	// 	EXIT_ERR("error encode text to base64");

	// printf("%s\n", dst);
	// printf("%lu\n", dst_size);

	// unsigned char* dst_decode = NULL;
	// size_t dst_size_decode = 0;
	// int decode_ok = decode_b64(dst, 0, &dst_decode, &dst_size_decode);
	// if (decode_ok != B64_DECODE_OK)
	// 	EXIT_ERR("error decode text to base64");

	// printf("%s\n", dst_decode);
	// printf("%lu\n", dst_size_decode);


	// free(dst);
	// free(dst_decode);

	// ---------------------------

	// encode file to base64

	// if (argc < 2)
	// {
	// 	EXIT_ERR("required filename");
	// }

	// char* filename = argv[1];
	// char* filename_out = "./testdata/out.txt";

	// printf("filename : %s\n", filename);

	// FILE* file;
	// FILE* file_out;

	// file = fopen(filename, "rb");
	// if (file == NULL)
	// {
	// 	EXIT_ERR("file not found");
	// }

	// file_out = fopen(filename_out, "wb");

	// size_t file_size;
	// if (get_file_size(&file_size, file) != 0)
	// 	EXIT_ERR("error get file size");

	// printf("%lu\n", file_size);

	// unsigned char input[file_size+1];
	// unsigned char* dst = NULL;
	// size_t dst_size = 0;

	// fread(input, sizeof(char), file_size, file);
	// input[file_size] = '\0';

	// int encode_ok = encode_b64(input, file_size, &dst, &dst_size);
	// if (encode_ok != B64_ENCODE_OK)
	// 	EXIT_ERR("error encode text to base64");

	// // printf("%s\n", dst);
	// fwrite(dst, 1, dst_size, file_out);

	// fclose(file);
	// fclose(file_out);
	// free(dst);

	// -----------------------

	// decode file from base64

	char* filename = "./testdata/out.txt";
	char* filename_out = "./testdata/out.png";
	FILE* file;
	FILE* file_out;

	file = fopen(filename, "r");
	if (file == NULL)
	{
	    EXIT_ERR("file not found");
	}

	file_out = fopen(filename_out, "wb");

	size_t file_size;
	if (get_file_size(&file_size, file) != 0)
	    EXIT_ERR("error get file size");

	printf("%lu\n", file_size);

	unsigned char input[file_size+1];

	unsigned char* dst_decode = NULL;
	size_t dst_size_decode = 0;

	fread(input, sizeof(char), file_size, file);
	input[file_size] = '\0';

	int decode_ok = decode_b64(input, 0, &dst_decode, &dst_size_decode);
	if (decode_ok != B64_DECODE_OK)
		EXIT_ERR("error decode text to base64");

	printf("%s\n", dst_decode);

	fwrite(dst_decode, 1, dst_size_decode, file_out);

	free(dst_decode);
	fclose(file);
	fclose(file_out);

	return 0;
}

int get_file_size(size_t* size, FILE* f)
{
    // goto the end of the file
    if (fseek(f, 0L, SEEK_END) != 0)
        return -1;

    // get the current file position of the given stream.
    *size = ftell(f);

    // go back the start of the file
    if (fseek(f, 0L, SEEK_SET) != 0)
        return -1;
    
    return 0;
}