[v2,11/14] csum-file.h: introduce 'hashwrite_be64()'

Commit Message

Taylor Blau Aug. 5, 2020, 5:02 p.m. UTC

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 <[e-mail]>
Signed-off-by: Taylor Blau <[e-mail]>
---
 commit-graph.c | 8 ++------
 csum-file.h    | 6 ++++++
 midx.c         | 3 +--
 3 files changed, 9 insertions(+), 8 deletions(-)

Patch

diff --git a/commit-graph.c b/commit-graph.c
index 0d70545149..8964453433 100644
--- a/commit-graph.c
+++ b/commit-graph.c
@@ -1784,12 +1784,8 @@  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 6d1584ca51..8b33149ce4 100644
--- a/midx.c
+++ b/midx.c
@@ -775,8 +775,7 @@  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);
 
 		nr_large_offset--;