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authorDana L. How <danahow@gmail.com>2007-05-02 12:13:14 -0400
committerShawn O. Pearce <spearce@spearce.org>2007-05-02 13:24:18 -0400
commit8b0eca7c7b73d0dc5d49f400a878d9b781ec4bec (patch)
treeceb7cab66263987f79c156c223870d0efadb1f6c /pack-write.c
parentdb81e67a7d559544f8464cdfd011208e60b76344 (diff)
downloadgit-8b0eca7c7b73d0dc5d49f400a878d9b781ec4bec.tar.gz
git-8b0eca7c7b73d0dc5d49f400a878d9b781ec4bec.tar.xz
Create pack-write.c for common pack writing code
Include a generalized fixup_pack_header_footer() in this new file. Needed by git-repack --max-pack-size feature in a later patchset. [sp: Moved close(pack_fd) to callers, to support index-pack, and changed name to better indicate it is for packfiles.] Signed-off-by: Dana L. How <danahow@gmail.com> Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Diffstat (limited to 'pack-write.c')
-rw-r--r--pack-write.c39
1 files changed, 39 insertions, 0 deletions
diff --git a/pack-write.c b/pack-write.c
new file mode 100644
index 000000000..de72f44dc
--- /dev/null
+++ b/pack-write.c
@@ -0,0 +1,39 @@
+#include "cache.h"
+#include "pack.h"
+
+void fixup_pack_header_footer(int pack_fd,
+ unsigned char *pack_file_sha1,
+ const char *pack_name,
+ uint32_t object_count)
+{
+ static const int buf_sz = 128 * 1024;
+ SHA_CTX c;
+ struct pack_header hdr;
+ char *buf;
+
+ if (lseek(pack_fd, 0, SEEK_SET) != 0)
+ die("Failed seeking to start: %s", strerror(errno));
+ if (read_in_full(pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr))
+ die("Unable to reread header of %s: %s", pack_name, strerror(errno));
+ if (lseek(pack_fd, 0, SEEK_SET) != 0)
+ die("Failed seeking to start: %s", strerror(errno));
+ hdr.hdr_entries = htonl(object_count);
+ write_or_die(pack_fd, &hdr, sizeof(hdr));
+
+ SHA1_Init(&c);
+ SHA1_Update(&c, &hdr, sizeof(hdr));
+
+ buf = xmalloc(buf_sz);
+ for (;;) {
+ size_t n = xread(pack_fd, buf, buf_sz);
+ if (!n)
+ break;
+ if (n < 0)
+ die("Failed to checksum %s: %s", pack_name, strerror(errno));
+ SHA1_Update(&c, buf, n);
+ }
+ free(buf);
+
+ SHA1_Final(pack_file_sha1, &c);
+ write_or_die(pack_fd, pack_file_sha1, 20);
+}