read a whole binary file to buffer

read_file.cpp

// https://bytefreaks.net/programming-2/c/cc-full-example-of-reading-a-whole-binary-file-to-buffer

struct binary_data_t
{
    long size;
    void *data;

    binary_data_t() : size(0), data(nullptr) {}
    ~binary_data_t() { delete[] data; }
};

binary_data_t *read_file(const char *filename)
{
    binary_data_t *binary_data = new binary_data_t;
    if (binary_data != NULL)
    {
        binary_data->size = 0;
        // Open the file for reading in binary mode
        FILE *fIn = fopen(filename, "rb");
        if (fIn != NULL)
        {
            // Go to the end of the file
            const int fseek_end_value = fseek(fIn, 0, SEEK_END);
            if (fseek_end_value != -1)
            {
                // Get the current position in the file (in bytes)
                long position = ftell(fIn);
                if (position != -1)
                {
                    // Go back to the beginning of the file
                    const int fseek_set_value = fseek(fIn, 0, SEEK_SET);
                    if (fseek_set_value != -1)
                    {
                        // Allocate enough space to read the whole file
                        // void *buffer = malloc(position);
                        void *buffer = new char[position];
                        if (buffer != NULL)
                        {
                            // Read the whole file to buffer
                            const long size = fread(buffer, 1, position, fIn);

                            if (size == position)
                            {
                                binary_data->size = position;
                                binary_data->data = buffer;

                                fclose(fIn);
                                return binary_data;
                            }
                            // free(buffer);
                            delete[] buffer;
                        }
                    }
                }
            }
            fclose(fIn);
        }
        delete binary_data;
    }
    return nullptr;
}