Re: [PATCH v4 11/14] csum-file.h: introduce 'hashwrite_be64()'

> A small handful of writers who wish to encode 64-bit values in network
> order have worked around the lack of such a helper by calling the 32-bit
> variant twice.
>
> The subsequent commit will add another caller who wants to write a
> 64-bit value. To ease their (and the existing caller's) pain, introduce
> a helper to do just that, and convert existing call-sites.
>
> Suggested-by: Derrick Stolee <dstolee@microsoft.com>
> Signed-off-by: Taylor Blau <me@ttaylorr.com>
> ---
>  commit-graph.c | 8 ++------
>  csum-file.h    | 6 ++++++
>  midx.c         | 3 +--
>  3 files changed, 9 insertions(+), 8 deletions(-)
>
> diff --git a/commit-graph.c b/commit-graph.c
> index 35535f4192..01d791343a 100644
> --- a/commit-graph.c
> +++ b/commit-graph.c
> @@ -1791,12 +1791,8 @@ static int write_commit_graph_file(struct write_commit_graph_context *ctx)
>
>  	chunk_offset = 8 + (num_chunks + 1) * GRAPH_CHUNKLOOKUP_WIDTH;
>  	for (i = 0; i <= num_chunks; i++) {
> -		uint32_t chunk_write[3];
> -
> -		chunk_write[0] = htonl(chunks[i].id);
> -		chunk_write[1] = htonl(chunk_offset >> 32);
> -		chunk_write[2] = htonl(chunk_offset & 0xffffffff);
> -		hashwrite(f, chunk_write, 12);
> +		hashwrite_be32(f, chunks[i].id);
> +		hashwrite_be64(f, chunk_offset);
>
>  		chunk_offset += chunks[i].size;
>  	}
> diff --git a/csum-file.h b/csum-file.h
> index f9cbd317fb..b026ec7766 100644
> --- a/csum-file.h
> +++ b/csum-file.h
> @@ -62,4 +62,10 @@ static inline void hashwrite_be32(struct hashfile *f, uint32_t data)
>  	hashwrite(f, &data, sizeof(data));
>  }
>
> +static inline void hashwrite_be64(struct hashfile *f, uint64_t data)
> +{
> +	hashwrite_be32(f, data >> 32);
> +	hashwrite_be32(f, data & 0xffffffffUL);
> +}
> +
>  #endif
> diff --git a/midx.c b/midx.c
> index e9b2e1253a..32cc5fdc22 100644
> --- a/midx.c
> +++ b/midx.c
> @@ -789,8 +789,7 @@ static size_t write_midx_large_offsets(struct hashfile *f, uint32_t nr_large_off
>  		if (!(offset >> 31))
>  			continue;
>
> -		hashwrite_be32(f, offset >> 32);
> -		hashwrite_be32(f, offset & 0xffffffffUL);
> +		hashwrite_be64(f, offset);
>  		written += 2 * sizeof(uint32_t);