hexembed.c

/*
 * hexembed - a simple utility to help embed files in C programs
 *
 * Copyright (c) 2010-2018 Lewis Van Winkle
 *
 * http://CodePlea.com
 *
 * This software is provided 'as-is', without any express or implied
 * warranty. In no event will the authors be held liable for any damages
 * arising from the use of this software.
 *
 * Permission is granted to anyone to use this software for any purpose,
 * including commercial applications, and to alter it and redistribute it
 * freely, subject to the following restrictions:
 *
 * 1. The origin of this software must not be misrepresented; you must not
 *    claim that you wrote the original software. If you use this software
 *    in a product, an acknowledgement in the product documentation would be
 *    appreciated but is not required.
 * 2. Altered source versions must be plainly marked as such, and must not be
 *    misrepresented as being the original software.
 * 3. This notice may not be removed or altered from any source distribution.
 *
 */


#include <stdio.h>
#include <stdlib.h>

int main(int argc, char *argv[]) {
    if (argc < 2) {printf("Usage:\n\thexembed <filename>\n"); return 1;}

    const char *fname = argv[1];
    FILE *fp = fopen(fname, "rb");
    if (!fp) {
        fprintf(stderr, "Error opening file: %s.\n", fname);
        return 1;
    }

    fseek(fp, 0, SEEK_END);
    const int fsize = ftell(fp);

    fseek(fp, 0, SEEK_SET);
    unsigned char *b = malloc(fsize);

    fread(b, fsize, 1, fp);
    fclose(fp);


    printf("/* Embedded file: %s */\n", fname);
    printf("const int fsize = %d;\n", fsize);
    printf("const unsigned char *file = {\n");

    int i;
    for (i = 0; i < fsize; ++i) {
        printf("0x%02x%s",
                b[i],
                i == fsize-1 ? "" : ((i+1) % 16 == 0 ? ",\n" : ","));
    }

    printf("\n};\n");

    free(b);
    return 0;
}