[PATCH 28/31] dir: make untracked cache extension hash size independent
- From
brian m. carlson <sandals@crustytoothpaste.net>
- Date
- Feb 12, 2019, 01:22 UTC
- Message-ID
- <20190212012256.1005924-29-sandals@crustytoothpaste.net>
- In-Reply-To
- <20190212012256.1005924-1-sandals@crustytoothpaste.net>
Instead of using a struct with a flex array member to read and write the untracked cache extension, use a shorter, fixed-length struct and add the name and hash data explicitly.
Signed-off-by: brian m. carlson <sandals@crustytoothpaste.net> --- dir.c | 28 ++++++++++++++-------------- 1 file changed, 14 insertions(+), 14 deletions(-)
diff --git a/dir.c b/dir.c index b2cabadf25..7503b56918 100644 --- a/dir.c +++ b/dir.c @@ -2545,13 +2545,9 @@ struct ondisk_untracked_cache { struct stat_data info_exclude_stat; struct stat_data excludes_file_stat; uint32_t dir_flags; - unsigned char info_exclude_sha1[20]; - unsigned char excludes_file_sha1[20]; - char exclude_per_dir[FLEX_ARRAY]; }; #define ouc_offset(x) offsetof(struct ondisk_untracked_cache, x) -#define ouc_size(len) (ouc_offset(exclude_per_dir) + len + 1) struct write_data { int index; /* number of written untracked_cache_dir */ @@ -2634,20 +2630,21 @@ void write_untracked_extension(struct strbuf *out, struct untracked_cache *untra struct write_data wd; unsigned char varbuf[16]; int varint_len; - size_t len = strlen(untracked->exclude_per_dir); + const unsigned hashsz = the_hash_algo->rawsz; - FLEX_ALLOC_MEM(ouc, exclude_per_dir, untracked->exclude_per_dir, len); + ouc = xcalloc(1, sizeof(*ouc)); stat_data_to_disk(&ouc->info_exclude_stat, &untracked->ss_info_exclude.stat); stat_data_to_disk(&ouc->excludes_file_stat, &untracked->ss_excludes_file.stat); - hashcpy(ouc->info_exclude_sha1, untracked->ss_info_exclude.oid.hash); - hashcpy(ouc->excludes_file_sha1, untracked->ss_excludes_file.oid.hash); ouc->dir_flags = htonl(untracked->dir_flags); varint_len = encode_varint(untracked->ident.len, varbuf); strbuf_add(out, varbuf, varint_len); strbuf_addbuf(out, &untracked->ident); - strbuf_add(out, ouc, ouc_size(len)); + strbuf_add(out, ouc, sizeof(*ouc)); + strbuf_add(out, untracked->ss_info_exclude.oid.hash, hashsz); + strbuf_add(out, untracked->ss_excludes_file.oid.hash, hashsz); + strbuf_add(out, untracked->exclude_per_dir, strlen(untracked->exclude_per_dir) + 1); FREE_AND_NULL(ouc); if (!untracked->root) { @@ -2834,6 +2831,9 @@ struct untracked_cache *read_untracked_extension(const void *data, unsigned long int ident_len; ssize_t len; const char *exclude_per_dir; + const unsigned hashsz = the_hash_algo->rawsz; + const unsigned offset = sizeof(struct ondisk_untracked_cache); + const unsigned exclude_per_dir_offset = offset + 2 * hashsz; if (sz <= 1 || end[-1] != '\0') return NULL; @@ -2845,7 +2845,7 @@ struct untracked_cache *read_untracked_extension(const void *data, unsigned long ident = (const char *)next; next += ident_len; - if (next + ouc_size(0) > end) + if (next + exclude_per_dir_offset + 1 > end) return NULL; uc = xcalloc(1, sizeof(*uc)); @@ -2853,15 +2853,15 @@ struct untracked_cache *read_untracked_extension(const void *data, unsigned long strbuf_add(&uc->ident, ident, ident_len); load_oid_stat(&uc->ss_info_exclude, next + ouc_offset(info_exclude_stat), - next + ouc_offset(info_exclude_sha1)); + next + offset); load_oid_stat(&uc->ss_excludes_file, next + ouc_offset(excludes_file_stat), - next + ouc_offset(excludes_file_sha1)); + next + offset + hashsz); uc->dir_flags = get_be32(next + ouc_offset(dir_flags)); - exclude_per_dir = (const char *)next + ouc_offset(exclude_per_dir); + exclude_per_dir = (const char *)next + exclude_per_dir_offset; uc->exclude_per_dir = xstrdup(exclude_per_dir); /* NUL after exclude_per_dir is covered by sizeof(*ouc) */ - next += ouc_size(strlen(exclude_per_dir)); + next += exclude_per_dir_offset + strlen(exclude_per_dir) + 1; if (next >= end) goto done2;