Function ImFileLoadToMemory

examples/ThirdPartyLibs/imgui/imgui.cpp:1513–1551

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