On Wed, Oct 10, 2018 at 09:58:51AM +0900, Junio C Hamano wrote:
> > +static void bitmap_to_rle(struct strbuf *out, struct bitmap *bitmap)
> > +{
> > + int curval = 0; /* count zeroes, then ones, then zeroes, etc */
> > + size_t run = 0;
> > + size_t word;
> > + size_t orig_len = out->len;
Jeff King writes:
> +static void strbuf_add_varint(struct strbuf *out, uintmax_t val)
> +{
> + size_t len;
> + strbuf_grow(out, 16); /* enough for any varint */
> + len = encode_varint(val, (unsigned char *)out->buf + out->len);
> + strbuf_setlen(out, out->len + len);
> +}
> +
>
The rules are basically:
- each bitmap is a series of counts of runs of 0/1
- each count is one of our standard varints
- each bitmap must have at least one initial count of
zeroes (which may itself be a zero-length count, if the
first bit is set)
- a zero-length count anywhere else
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