Function ImFileLoadToMemory

libs/imgui/imgui.cpp:1362–1400

Load file content into memory Memory allocated with ImGui::MemAlloc(), must be freed by user using ImGui::MemFree()

// Load file content into memory
// Memory allocated with ImGui::MemAlloc(), must be freed by user using ImGui::MemFree()
void* ImFileLoadToMemory(const char* filename, const char* file_open_mode, int* out_file_size, int padding_bytes)
{
    IM_ASSERT(filename && file_open_mode);
    if (out_file_size)
        *out_file_size = 0;

    FILE* f;
    if ((f = ImFileOpen(filename, file_open_mode)) == NULL)
        return NULL;

    long file_size_signed;
    if (fseek(f, 0, SEEK_END) || (file_size_signed = ftell(f)) == -1 || fseek(f, 0, SEEK_SET))
    {
        fclose(f);
        return NULL;
    }

    int file_size = (int)file_size_signed;
    void* file_data = ImGui::MemAlloc(file_size + padding_bytes);
    if (file_data == NULL)
    {
        fclose(f);
        return NULL;
    }
    if (fread(file_data, 1, (size_t)file_size, f) != (size_t)file_size)
    {
        fclose(f);
        ImGui::MemFree(file_data);
        return NULL;
    }
    if (padding_bytes > 0)
        memset((void *)(((char*)file_data) + file_size), 0, padding_bytes);

    fclose(f);
    if (out_file_size)
        *out_file_size = file_size;

    return file_data;
}

//-----------------------------------------------------------------------------
// ImGuiStorage