Merge branch 'bc/object-id'

Conversion from uchar[40] to struct object_id continues.

* bc/object-id:
  pretty: switch hard-coded constants to the_hash_algo
  sha1-file: convert constants to uses of the_hash_algo
  log-tree: switch GIT_SHA1_HEXSZ to the_hash_algo->hexsz
  diff: switch GIT_SHA1_HEXSZ to use the_hash_algo
  builtin/merge-recursive: make hash independent
  builtin/merge: switch to use the_hash_algo
  builtin/fmt-merge-msg: make hash independent
  builtin/update-index: simplify parsing of cacheinfo
  builtin/update-index: convert to using the_hash_algo
  refs/files-backend: use the_hash_algo for writing refs
  sha1-name: use the_hash_algo when parsing object names
  strbuf: allocate space with GIT_MAX_HEXSZ
  commit: express tree entry constants in terms of the_hash_algo
  hex: switch to using the_hash_algo
  tree-walk: replace hard-coded constants with the_hash_algo
  cache: update object ID functions for the_hash_algo

15 files changed, 56 insertions, 49 deletions

diff --git a/builtin/fmt-merge-msg.c b/builtin/fmt-merge-msg.c
index 1b526adb3a..8ccb14b870 100644
--- a/builtin/fmt-merge-msg.c
+++ b/builtin/fmt-merge-msg.c
@@ -109,14 +109,15 @@ static int handle_line(char *line, struct merge_parents *merge_parents)
 	struct string_list_item *item;
 	int pulling_head = 0;
 	struct object_id oid;
+	const unsigned hexsz = the_hash_algo->hexsz;
 
-	if (len < GIT_SHA1_HEXSZ + 3 || line[GIT_SHA1_HEXSZ] != '\t')
+	if (len < hexsz + 3 || line[hexsz] != '\t')
 		return 1;
 
-	if (starts_with(line + GIT_SHA1_HEXSZ + 1, "not-for-merge"))
+	if (starts_with(line + hexsz + 1, "not-for-merge"))
 		return 0;
 
-	if (line[GIT_SHA1_HEXSZ + 1] != '\t')
+	if (line[hexsz + 1] != '\t')
 		return 2;
 
 	i = get_oid_hex(line, &oid);
@@ -131,7 +132,7 @@ static int handle_line(char *line, struct merge_parents *merge_parents)
 
 	if (line[len - 1] == '\n')
 		line[len - 1] = 0;
-	line += GIT_SHA1_HEXSZ + 2;
+	line += hexsz + 2;
 
 	/*
 	 * At this point, line points at the beginning of comment e.g.
@@ -343,7 +344,7 @@ static void shortlog(const char *name,
 	const struct object_id *oid = &origin_data->oid;
 	int limit = opts->shortlog_len;
 
-	branch = deref_tag(parse_object(oid), oid_to_hex(oid), GIT_SHA1_HEXSZ);
+	branch = deref_tag(parse_object(oid), oid_to_hex(oid), the_hash_algo->hexsz);
 	if (!branch || branch->type != OBJ_COMMIT)
 		return;
 
@@ -546,6 +547,7 @@ static void find_merge_parents(struct merge_parents *result,
 		int len;
 		char *p = in->buf + pos;
 		char *newline = strchr(p, '\n');
+		const char *q;
 		struct object_id oid;
 		struct commit *parent;
 		struct object *obj;
@@ -553,10 +555,9 @@ static void find_merge_parents(struct merge_parents *result,
 		len = newline ? newline - p : strlen(p);
 		pos += len + !!newline;
 
-		if (len < GIT_SHA1_HEXSZ + 3 ||
-		    get_oid_hex(p, &oid) ||
-		    p[GIT_SHA1_HEXSZ] != '\t' ||
-		    p[GIT_SHA1_HEXSZ + 1] != '\t')
+		if (parse_oid_hex(p, &oid, &q) ||
+		    q[0] != '\t' ||
+		    q[1] != '\t')
 			continue; /* skip not-for-merge */
 		/*
 		 * Do not use get_merge_parent() here; we do not have
diff --git a/builtin/merge-recursive.c b/builtin/merge-recursive.c
index 0dd9021958..9b2f707c29 100644
--- a/builtin/merge-recursive.c
+++ b/builtin/merge-recursive.c
@@ -9,10 +9,10 @@ static const char builtin_merge_recursive_usage[] =
 
 static const char *better_branch_name(const char *branch)
 {
-	static char githead_env[8 + GIT_SHA1_HEXSZ + 1];
+	static char githead_env[8 + GIT_MAX_HEXSZ + 1];
 	char *name;
 
-	if (strlen(branch) != GIT_SHA1_HEXSZ)
+	if (strlen(branch) != the_hash_algo->hexsz)
 		return branch;
 	xsnprintf(githead_env, sizeof(githead_env), "GITHEAD_%s", branch);
 	name = getenv(githead_env);
diff --git a/builtin/merge.c b/builtin/merge.c
index d1b547d973..299a754259 100644
--- a/builtin/merge.c
+++ b/builtin/merge.c
@@ -1035,6 +1035,7 @@ static void handle_fetch_head(struct commit_list **remotes, struct strbuf *merge
 	const char *filename;
 	int fd, pos, npos;
 	struct strbuf fetch_head_file = STRBUF_INIT;
+	const unsigned hexsz = the_hash_algo->hexsz;
 
 	if (!merge_names)
 		merge_names = &fetch_head_file;
@@ -1060,16 +1061,16 @@ static void handle_fetch_head(struct commit_list **remotes, struct strbuf *merge
 		else
 			npos = merge_names->len;
 
-		if (npos - pos < GIT_SHA1_HEXSZ + 2 ||
+		if (npos - pos < hexsz + 2 ||
 		    get_oid_hex(merge_names->buf + pos, &oid))
 			commit = NULL; /* bad */
-		else if (memcmp(merge_names->buf + pos + GIT_SHA1_HEXSZ, "\t\t", 2))
+		else if (memcmp(merge_names->buf + pos + hexsz, "\t\t", 2))
 			continue; /* not-for-merge */
 		else {
-			char saved = merge_names->buf[pos + GIT_SHA1_HEXSZ];
-			merge_names->buf[pos + GIT_SHA1_HEXSZ] = '\0';
+			char saved = merge_names->buf[pos + hexsz];
+			merge_names->buf[pos + hexsz] = '\0';
 			commit = get_merge_parent(merge_names->buf + pos);
-			merge_names->buf[pos + GIT_SHA1_HEXSZ] = saved;
+			merge_names->buf[pos + hexsz] = saved;
 		}
 		if (!commit) {
 			if (ptr)
diff --git a/builtin/update-index.c b/builtin/update-index.c
index a8709a26ec..3206c5ad45 100644
--- a/builtin/update-index.c
+++ b/builtin/update-index.c
@@ -492,6 +492,7 @@ static void update_one(const char *path)
 
 static void read_index_info(int nul_term_line)
 {
+	const int hexsz = the_hash_algo->hexsz;
 	struct strbuf buf = STRBUF_INIT;
 	struct strbuf uq = STRBUF_INIT;
 	strbuf_getline_fn getline_fn;
@@ -529,7 +530,7 @@ static void read_index_info(int nul_term_line)
 		mode = ul;
 
 		tab = strchr(ptr, '\t');
-		if (!tab || tab - ptr < GIT_SHA1_HEXSZ + 1)
+		if (!tab || tab - ptr < hexsz + 1)
 			goto bad_line;
 
 		if (tab[-2] == ' ' && '0' <= tab[-1] && tab[-1] <= '3') {
@@ -542,8 +543,8 @@ static void read_index_info(int nul_term_line)
 			ptr = tab + 1; /* point at the head of path */
 		}
 
-		if (get_oid_hex(tab - GIT_SHA1_HEXSZ, &oid) ||
-			tab[-(GIT_SHA1_HEXSZ + 1)] != ' ')
+		if (get_oid_hex(tab - hexsz, &oid) ||
+			tab[-(hexsz + 1)] != ' ')
 			goto bad_line;
 
 		path_name = ptr;
@@ -571,7 +572,7 @@ static void read_index_info(int nul_term_line)
 			 * ptr[-1] points at tab,
 			 * ptr[-41] is at the beginning of sha1
 			 */
-			ptr[-(GIT_SHA1_HEXSZ + 2)] = ptr[-1] = 0;
+			ptr[-(hexsz + 2)] = ptr[-1] = 0;
 			if (add_cacheinfo(mode, &oid, path_name, stage))
 				die("git update-index: unable to update %s",
 				    path_name);
@@ -826,6 +827,7 @@ static int parse_new_style_cacheinfo(const char *arg,
 {
 	unsigned long ul;
 	char *endp;
+	const char *p;
 
 	if (!arg)
 		return -1;
@@ -836,9 +838,9 @@ static int parse_new_style_cacheinfo(const char *arg,
 		return -1; /* not a new-style cacheinfo */
 	*mode = ul;
 	endp++;
-	if (get_oid_hex(endp, oid) || endp[GIT_SHA1_HEXSZ] != ',')
+	if (parse_oid_hex(endp, oid, &p) || *p != ',')
 		return -1;
-	*path = endp + GIT_SHA1_HEXSZ + 1;
+	*path = p + 1;
 	return 0;
 }
 
diff --git a/cache.h b/cache.h
index 8b447652a7..ebfe59d01c 100644
--- a/cache.h
+++ b/cache.h
@@ -972,7 +972,7 @@ extern const struct object_id null_oid;
 
 static inline int hashcmp(const unsigned char *sha1, const unsigned char *sha2)
 {
-	return memcmp(sha1, sha2, GIT_SHA1_RAWSZ);
+	return memcmp(sha1, sha2, the_hash_algo->rawsz);
 }
 
 static inline int oidcmp(const struct object_id *oid1, const struct object_id *oid2)
@@ -992,7 +992,7 @@ static inline int is_null_oid(const struct object_id *oid)
 
 static inline void hashcpy(unsigned char *sha_dst, const unsigned char *sha_src)
 {
-	memcpy(sha_dst, sha_src, GIT_SHA1_RAWSZ);
+	memcpy(sha_dst, sha_src, the_hash_algo->rawsz);
 }
 
 static inline void oidcpy(struct object_id *dst, const struct object_id *src)
@@ -1009,7 +1009,7 @@ static inline struct object_id *oiddup(const struct object_id *src)
 
 static inline void hashclr(unsigned char *hash)
 {
-	memset(hash, 0, GIT_SHA1_RAWSZ);
+	memset(hash, 0, the_hash_algo->rawsz);
 }
 
 static inline void oidclr(struct object_id *oid)
diff --git a/commit.c b/commit.c
index a7c0b5f8c6..bbca413ba7 100644
--- a/commit.c
+++ b/commit.c
@@ -369,8 +369,8 @@ int parse_commit_buffer(struct commit *item, const void *buffer, unsigned long s
 	struct object_id parent;
 	struct commit_list **pptr;
 	struct commit_graft *graft;
-	const int tree_entry_len = GIT_SHA1_HEXSZ + 5;
-	const int parent_entry_len = GIT_SHA1_HEXSZ + 7;
+	const int tree_entry_len = the_hash_algo->hexsz + 5;
+	const int parent_entry_len = the_hash_algo->hexsz + 7;
 
 	if (item->object.parsed)
 		return 0;
diff --git a/diff.c b/diff.c
index dc53a19bab..d20614605e 100644
--- a/diff.c
+++ b/diff.c
@@ -3833,7 +3833,7 @@ static const char *diff_abbrev_oid(const struct object_id *oid, int abbrev)
 		char *hex = oid_to_hex(oid);
 		if (abbrev < 0)
 			abbrev = FALLBACK_DEFAULT_ABBREV;
-		if (abbrev > GIT_SHA1_HEXSZ)
+		if (abbrev > the_hash_algo->hexsz)
 			BUG("oid abbreviation out of range: %d", abbrev);
 		if (abbrev)
 			hex[abbrev] = '\0';
@@ -4948,7 +4948,7 @@ const char *diff_aligned_abbrev(const struct object_id *oid, int len)
 	const char *abbrev;
 
 	/* Do we want all 40 hex characters? */
-	if (len == GIT_SHA1_HEXSZ)
+	if (len == the_hash_algo->hexsz)
 		return oid_to_hex(oid);
 
 	/* An abbreviated value is fine, possibly followed by an ellipsis. */
@@ -4978,7 +4978,7 @@ const char *diff_aligned_abbrev(const struct object_id *oid, int len)
 	 * the automatic sizing is supposed to give abblen that ensures
 	 * uniqueness across all objects (statistically speaking).
 	 */
-	if (abblen < GIT_SHA1_HEXSZ - 3) {
+	if (abblen < the_hash_algo->hexsz - 3) {
 		static char hex[GIT_MAX_HEXSZ + 1];
 		if (len < abblen && abblen <= len + 2)
 			xsnprintf(hex, sizeof(hex), "%s%.*s", abbrev, len+3-abblen, "..");
diff --git a/hex.c b/hex.c
index 8df2d63728..10af1a29e8 100644
--- a/hex.c
+++ b/hex.c
@@ -50,7 +50,7 @@ int hex_to_bytes(unsigned char *binary, const char *hex, size_t len)
 int get_sha1_hex(const char *hex, unsigned char *sha1)
 {
 	int i;
-	for (i = 0; i < GIT_SHA1_RAWSZ; i++) {
+	for (i = 0; i < the_hash_algo->rawsz; i++) {
 		int val = hex2chr(hex);
 		if (val < 0)
 			return -1;
@@ -69,7 +69,7 @@ int parse_oid_hex(const char *hex, struct object_id *oid, const char **end)
 {
 	int ret = get_oid_hex(hex, oid);
 	if (!ret)
-		*end = hex + GIT_SHA1_HEXSZ;
+		*end = hex + the_hash_algo->hexsz;
 	return ret;
 }
 
@@ -79,7 +79,7 @@ char *sha1_to_hex_r(char *buffer, const unsigned char *sha1)
 	char *buf = buffer;
 	int i;
 
-	for (i = 0; i < GIT_SHA1_RAWSZ; i++) {
+	for (i = 0; i < the_hash_algo->rawsz; i++) {
 		unsigned int val = *sha1++;
 		*buf++ = hex[val >> 4];
 		*buf++ = hex[val & 0xf];
diff --git a/log-tree.c b/log-tree.c
index 4a3907fea0..f2ca0fbd53 100644
--- a/log-tree.c
+++ b/log-tree.c
@@ -546,7 +546,7 @@ void show_log(struct rev_info *opt)
 	struct strbuf msgbuf = STRBUF_INIT;
 	struct log_info *log = opt->loginfo;
 	struct commit *commit = log->commit, *parent = log->parent;
-	int abbrev_commit = opt->abbrev_commit ? opt->abbrev : GIT_SHA1_HEXSZ;
+	int abbrev_commit = opt->abbrev_commit ? opt->abbrev : the_hash_algo->hexsz;
 	const char *extra_headers = opt->extra_headers;
 	struct pretty_print_context ctx = {0};
 
diff --git a/pretty.c b/pretty.c
index 703fa6ff7b..b0e653ff25 100644
--- a/pretty.c
+++ b/pretty.c
@@ -1575,7 +1575,7 @@ static void pp_header(struct pretty_print_context *pp,
 		}
 
 		if (starts_with(line, "parent ")) {
-			if (linelen != 48)
+			if (linelen != the_hash_algo->hexsz + 8)
 				die("bad parent line in commit");
 			continue;
 		}
@@ -1583,7 +1583,7 @@ static void pp_header(struct pretty_print_context *pp,
 		if (!parents_shown) {
 			unsigned num = commit_list_count(commit->parents);
 			/* with enough slop */
-			strbuf_grow(sb, num * 50 + 20);
+			strbuf_grow(sb, num * (GIT_MAX_HEXSZ + 10) + 20);
 			add_merge_info(pp, sb, commit);
 			parents_shown = 1;
 		}
diff --git a/refs/files-backend.c b/refs/files-backend.c
index 054306d779..4e43dd46b5 100644
--- a/refs/files-backend.c
+++ b/refs/files-backend.c
@@ -1667,7 +1667,7 @@ static int write_ref_to_lockfile(struct ref_lock *lock,
 		return -1;
 	}
 	fd = get_lock_file_fd(&lock->lk);
-	if (write_in_full(fd, oid_to_hex(oid), GIT_SHA1_HEXSZ) < 0 ||
+	if (write_in_full(fd, oid_to_hex(oid), the_hash_algo->hexsz) < 0 ||
 	    write_in_full(fd, &term, 1) < 0 ||
 	    close_ref_gently(lock) < 0) {
 		strbuf_addf(err,
@@ -3061,7 +3061,7 @@ static int files_reflog_expire(struct ref_store *ref_store,
 			rollback_lock_file(&reflog_lock);
 		} else if (update &&
 			   (write_in_full(get_lock_file_fd(&lock->lk),
-				oid_to_hex(&cb.last_kept_oid), GIT_SHA1_HEXSZ) < 0 ||
+				oid_to_hex(&cb.last_kept_oid), the_hash_algo->hexsz) < 0 ||
 			    write_str_in_full(get_lock_file_fd(&lock->lk), "\n") < 0 ||
 			    close_ref_gently(lock) < 0)) {
 			status |= error("couldn't write %s",
diff --git a/sha1-file.c b/sha1-file.c
index de4839e634..1f66b9594f 100644
--- a/sha1-file.c
+++ b/sha1-file.c
@@ -336,7 +336,7 @@ out:
 static void fill_sha1_path(struct strbuf *buf, const unsigned char *sha1)
 {
 	int i;
-	for (i = 0; i < 20; i++) {
+	for (i = 0; i < the_hash_algo->rawsz; i++) {
 		static char hex[] = "0123456789abcdef";
 		unsigned int val = sha1[i];
 		strbuf_addch(buf, hex[val >> 4]);
@@ -1473,7 +1473,7 @@ void *read_object_with_reference(const struct object_id *oid,
 		}
 		ref_length = strlen(ref_type);
 
-		if (ref_length + GIT_SHA1_HEXSZ > isize ||
+		if (ref_length + the_hash_algo->hexsz > isize ||
 		    memcmp(buffer, ref_type, ref_length) ||
 		    get_oid_hex((char *) buffer + ref_length, &actual_oid)) {
 			free(buffer);
@@ -2062,9 +2062,9 @@ int for_each_file_in_obj_subdir(unsigned int subdir_nr,
 		namelen = strlen(de->d_name);
 		strbuf_setlen(path, baselen);
 		strbuf_add(path, de->d_name, namelen);
-		if (namelen == GIT_SHA1_HEXSZ - 2 &&
+		if (namelen == the_hash_algo->hexsz - 2 &&
 		    !hex_to_bytes(oid.hash + 1, de->d_name,
-				  GIT_SHA1_RAWSZ - 1)) {
+				  the_hash_algo->rawsz - 1)) {
 			if (obj_cb) {
 				r = obj_cb(&oid, path->buf, data);
 				if (r)
diff --git a/sha1-name.c b/sha1-name.c
index 641ca12f91..e072d48dda 100644
--- a/sha1-name.c
+++ b/sha1-name.c
@@ -310,7 +310,7 @@ static int init_object_disambiguation(const char *name, int len,
 {
 	int i;
 
-	if (len < MINIMUM_ABBREV || len > GIT_SHA1_HEXSZ)
+	if (len < MINIMUM_ABBREV || len > the_hash_algo->hexsz)
 		return -1;
 
 	memset(ds, 0, sizeof(*ds));
@@ -576,6 +576,8 @@ int find_unique_abbrev_r(char *hex, const struct object_id *oid, int len)
 	struct disambiguate_state ds;
 	struct min_abbrev_data mad;
 	struct object_id oid_ret;
+	const unsigned hexsz = the_hash_algo->hexsz;
+
 	if (len < 0) {
 		unsigned long count = approximate_object_count();
 		/*
@@ -599,8 +601,8 @@ int find_unique_abbrev_r(char *hex, const struct object_id *oid, int len)
 	}
 
 	oid_to_hex_r(hex, oid);
-	if (len == GIT_SHA1_HEXSZ || !len)
-		return GIT_SHA1_HEXSZ;
+	if (len == hexsz || !len)
+		return hexsz;
 
 	mad.init_len = len;
 	mad.cur_len = len;
@@ -706,7 +708,7 @@ static int get_oid_basic(const char *str, int len, struct object_id *oid,
 	int refs_found = 0;
 	int at, reflog_len, nth_prior = 0;
 
-	if (len == GIT_SHA1_HEXSZ && !get_oid_hex(str, oid)) {
+	if (len == the_hash_algo->hexsz && !get_oid_hex(str, oid)) {
 		if (warn_ambiguous_refs && warn_on_object_refname_ambiguity) {
 			refs_found = dwim_ref(str, len, &tmp_oid, &real_ref);
 			if (refs_found > 0) {
@@ -750,7 +752,7 @@ static int get_oid_basic(const char *str, int len, struct object_id *oid,
 		int detached;
 
 		if (interpret_nth_prior_checkout(str, len, &buf) > 0) {
-			detached = (buf.len == GIT_SHA1_HEXSZ && !get_oid_hex(buf.buf, oid));
+			detached = (buf.len == the_hash_algo->hexsz && !get_oid_hex(buf.buf, oid));
 			strbuf_release(&buf);
 			if (detached)
 				return 0;
diff --git a/strbuf.c b/strbuf.c
index b0716ac585..030556111d 100644
--- a/strbuf.c
+++ b/strbuf.c
@@ -921,7 +921,7 @@ void strbuf_add_unique_abbrev(struct strbuf *sb, const struct object_id *oid,
 			      int abbrev_len)
 {
 	int r;
-	strbuf_grow(sb, GIT_SHA1_HEXSZ + 1);
+	strbuf_grow(sb, GIT_MAX_HEXSZ + 1);
 	r = find_unique_abbrev_r(sb->buf + sb->len, oid, abbrev_len);
 	strbuf_setlen(sb, sb->len + r);
 }
diff --git a/tree-walk.c b/tree-walk.c
index ecd6e53b85..77b37f36fa 100644
--- a/tree-walk.c
+++ b/tree-walk.c
@@ -27,8 +27,9 @@ static int decode_tree_entry(struct tree_desc *desc, const char *buf, unsigned l
 {
 	const char *path;
 	unsigned int mode, len;
+	const unsigned hashsz = the_hash_algo->rawsz;
 
-	if (size < 23 || buf[size - 21]) {
+	if (size < hashsz + 3 || buf[size - (hashsz + 1)]) {
 		strbuf_addstr(err, _("too-short tree object"));
 		return -1;
 	}