Re: [PATCH 04/32] move do_compress() from pack-objects.c to pack-write.c

> +unsigned long compress_object(void **pptr, unsigned long size)
> +{
> +	z_stream stream;
> +	void *in, *out;
> +	unsigned long maxsize;
> +
> +	memset(&stream, 0, sizeof(stream));
> +	deflateInit(&stream, Z_DEFAULT_COMPRESSION);
> +	maxsize = deflateBound(&stream, size);
> +
> +	in = *pptr;
> +	out = xmalloc(maxsize);
> +	*pptr = out;
> +
> +	stream.next_in = in;
> +	stream.avail_in = size;
> +	stream.next_out = out;
> +	stream.avail_out = maxsize;
> +	while (deflate(&stream, Z_FINISH) == Z_OK)
> +		; /* nothing */
> +	deflateEnd(&stream);
> +
> +	return stream.total_out;
> +}