Convert all but two of the static functions in this file to use struct
object_id.

Signed-off-by: brian m. carlson <sand...@crustytoothpaste.net>
Signed-off-by: Junio C Hamano <gits...@pobox.com>
---
 merge-recursive.c | 236 +++++++++++++++++++++++++++---------------------------
 1 file changed, 118 insertions(+), 118 deletions(-)

diff --git a/merge-recursive.c b/merge-recursive.c
index bc455491..7bbd4aea 100644
--- a/merge-recursive.c
+++ b/merge-recursive.c
@@ -56,11 +56,11 @@ static struct commit *make_virtual_commit(struct tree 
*tree, const char *comment
  * Since we use get_tree_entry(), which does not put the read object into
  * the object pool, we cannot rely on a == b.
  */
-static int sha_eq(const unsigned char *a, const unsigned char *b)
+static int oid_eq(const struct object_id *a, const struct object_id *b)
 {
        if (!a && !b)
                return 2;
-       return a && b && hashcmp(a, b) == 0;
+       return a && b && oidcmp(a, b) == 0;
 }
 
 enum rename_type {
@@ -198,11 +198,11 @@ static void output_commit_title(struct merge_options *o, 
struct commit *commit)
        }
 }
 
-static int add_cacheinfo(unsigned int mode, const unsigned char *sha1,
+static int add_cacheinfo(unsigned int mode, const struct object_id *oid,
                const char *path, int stage, int refresh, int options)
 {
        struct cache_entry *ce;
-       ce = make_cache_entry(mode, sha1 ? sha1 : null_sha1, path, stage,
+       ce = make_cache_entry(mode, oid ? oid->hash : null_sha1, path, stage,
                              (refresh ? (CE_MATCH_REFRESH |
                                          CE_MATCH_IGNORE_MISSING) : 0 ));
        if (!ce)
@@ -552,13 +552,13 @@ static int update_stages(const char *path, const struct 
diff_filespec *o,
                if (remove_file_from_cache(path))
                        return -1;
        if (o)
-               if (add_cacheinfo(o->mode, o->oid.hash, path, 1, 0, options))
+               if (add_cacheinfo(o->mode, &o->oid, path, 1, 0, options))
                        return -1;
        if (a)
-               if (add_cacheinfo(a->mode, a->oid.hash, path, 2, 0, options))
+               if (add_cacheinfo(a->mode, &a->oid, path, 2, 0, options))
                        return -1;
        if (b)
-               if (add_cacheinfo(b->mode, b->oid.hash, path, 3, 0, options))
+               if (add_cacheinfo(b->mode, &b->oid, path, 3, 0, options))
                        return -1;
        return 0;
 }
@@ -736,7 +736,7 @@ static int make_room_for_path(struct merge_options *o, 
const char *path)
 }
 
 static void update_file_flags(struct merge_options *o,
-                             const unsigned char *sha,
+                             const struct object_id *oid,
                              unsigned mode,
                              const char *path,
                              int update_cache,
@@ -760,11 +760,11 @@ static void update_file_flags(struct merge_options *o,
                        goto update_index;
                }
 
-               buf = read_sha1_file(sha, &type, &size);
+               buf = read_sha1_file(oid->hash, &type, &size);
                if (!buf)
-                       die(_("cannot read object %s '%s'"), sha1_to_hex(sha), 
path);
+                       die(_("cannot read object %s '%s'"), oid_to_hex(oid), 
path);
                if (type != OBJ_BLOB)
-                       die(_("blob expected for %s '%s'"), sha1_to_hex(sha), 
path);
+                       die(_("blob expected for %s '%s'"), oid_to_hex(oid), 
path);
                if (S_ISREG(mode)) {
                        struct strbuf strbuf = STRBUF_INIT;
                        if (convert_to_working_tree(path, buf, size, &strbuf)) {
@@ -799,21 +799,21 @@ static void update_file_flags(struct merge_options *o,
                        free(lnk);
                } else
                        die(_("do not know what to do with %06o %s '%s'"),
-                           mode, sha1_to_hex(sha), path);
+                           mode, oid_to_hex(oid), path);
                free(buf);
        }
  update_index:
        if (update_cache)
-               add_cacheinfo(mode, sha, path, 0, update_wd, 
ADD_CACHE_OK_TO_ADD);
+               add_cacheinfo(mode, oid, path, 0, update_wd, 
ADD_CACHE_OK_TO_ADD);
 }
 
 static void update_file(struct merge_options *o,
                        int clean,
-                       const unsigned char *sha,
+                       const struct object_id *oid,
                        unsigned mode,
                        const char *path)
 {
-       update_file_flags(o, sha, mode, path, o->call_depth || clean, 
!o->call_depth);
+       update_file_flags(o, oid, mode, path, o->call_depth || clean, 
!o->call_depth);
 }
 
 /* Low level file merging, update and removal */
@@ -908,7 +908,7 @@ static struct merge_file_info merge_file_1(struct 
merge_options *o,
                        oidcpy(&result.oid, &b->oid);
                }
        } else {
-               if (!sha_eq(a->oid.hash, one->oid.hash) && !sha_eq(b->oid.hash, 
one->oid.hash))
+               if (!oid_eq(&a->oid, &one->oid) && !oid_eq(&b->oid, &one->oid))
                        result.merge = 1;
 
                /*
@@ -924,9 +924,9 @@ static struct merge_file_info merge_file_1(struct 
merge_options *o,
                        }
                }
 
-               if (sha_eq(a->oid.hash, b->oid.hash) || sha_eq(a->oid.hash, 
one->oid.hash))
+               if (oid_eq(&a->oid, &b->oid) || oid_eq(&a->oid, &one->oid))
                        oidcpy(&result.oid, &b->oid);
-               else if (sha_eq(b->oid.hash, one->oid.hash))
+               else if (oid_eq(&b->oid, &one->oid))
                        oidcpy(&result.oid, &a->oid);
                else if (S_ISREG(a->mode)) {
                        mmbuffer_t result_buf;
@@ -955,7 +955,7 @@ static struct merge_file_info merge_file_1(struct 
merge_options *o,
                } else if (S_ISLNK(a->mode)) {
                        oidcpy(&result.oid, &a->oid);
 
-                       if (!sha_eq(a->oid.hash, b->oid.hash))
+                       if (!oid_eq(&a->oid, &b->oid))
                                result.clean = 0;
                } else {
                        die(_("unsupported object type in the tree"));
@@ -993,34 +993,34 @@ merge_file_special_markers(struct merge_options *o,
 
 static struct merge_file_info merge_file_one(struct merge_options *o,
                                         const char *path,
-                                        const unsigned char *o_sha, int o_mode,
-                                        const unsigned char *a_sha, int a_mode,
-                                        const unsigned char *b_sha, int b_mode,
+                                        const struct object_id *o_oid, int 
o_mode,
+                                        const struct object_id *a_oid, int 
a_mode,
+                                        const struct object_id *b_oid, int 
b_mode,
                                         const char *branch1,
                                         const char *branch2)
 {
        struct diff_filespec one, a, b;
 
        one.path = a.path = b.path = (char *)path;
-       hashcpy(one.oid.hash, o_sha);
+       oidcpy(&one.oid, o_oid);
        one.mode = o_mode;
-       hashcpy(a.oid.hash, a_sha);
+       oidcpy(&a.oid, a_oid);
        a.mode = a_mode;
-       hashcpy(b.oid.hash, b_sha);
+       oidcpy(&b.oid, b_oid);
        b.mode = b_mode;
        return merge_file_1(o, &one, &a, &b, branch1, branch2);
 }
 
 static void handle_change_delete(struct merge_options *o,
                                 const char *path,
-                                const unsigned char *o_sha, int o_mode,
-                                const unsigned char *a_sha, int a_mode,
-                                const unsigned char *b_sha, int b_mode,
+                                const struct object_id *o_oid, int o_mode,
+                                const struct object_id *a_oid, int a_mode,
+                                const struct object_id *b_oid, int b_mode,
                                 const char *change, const char *change_past)
 {
        char *renamed = NULL;
        if (dir_in_way(path, !o->call_depth)) {
-               renamed = unique_path(o, path, a_sha ? o->branch1 : o->branch2);
+               renamed = unique_path(o, path, a_oid ? o->branch1 : o->branch2);
        }
 
        if (o->call_depth) {
@@ -1030,20 +1030,20 @@ static void handle_change_delete(struct merge_options 
*o,
                 * them, simply reuse the base version for virtual merge base.
                 */
                remove_file_from_cache(path);
-               update_file(o, 0, o_sha, o_mode, renamed ? renamed : path);
-       } else if (!a_sha) {
+               update_file(o, 0, o_oid, o_mode, renamed ? renamed : path);
+       } else if (!a_oid) {
                if (!renamed) {
                        output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s "
                               "and %s in %s. Version %s of %s left in tree."),
                               change, path, o->branch1, change_past,
                               o->branch2, o->branch2, path);
-                       update_file(o, 0, b_sha, b_mode, path);
+                       update_file(o, 0, b_oid, b_mode, path);
                } else {
                        output(o, 1, _("CONFLICT (%s/delete): %s deleted in %s "
                               "and %s in %s. Version %s of %s left in tree at 
%s."),
                               change, path, o->branch1, change_past,
                               o->branch2, o->branch2, path, renamed);
-                       update_file(o, 0, b_sha, b_mode, renamed);
+                       update_file(o, 0, b_oid, b_mode, renamed);
                }
        } else {
                if (!renamed) {
@@ -1056,7 +1056,7 @@ static void handle_change_delete(struct merge_options *o,
                               "and %s in %s. Version %s of %s left in tree at 
%s."),
                               change, path, o->branch2, change_past,
                               o->branch1, o->branch1, path, renamed);
-                       update_file(o, 0, a_sha, a_mode, renamed);
+                       update_file(o, 0, a_oid, a_mode, renamed);
                }
                /*
                 * No need to call update_file() on path when !renamed, since
@@ -1075,24 +1075,24 @@ static void conflict_rename_delete(struct merge_options 
*o,
 {
        const struct diff_filespec *orig = pair->one;
        const struct diff_filespec *dest = pair->two;
-       const unsigned char *a_sha = NULL;
-       const unsigned char *b_sha = NULL;
+       const struct object_id *a_oid = NULL;
+       const struct object_id *b_oid = NULL;
        int a_mode = 0;
        int b_mode = 0;
 
        if (rename_branch == o->branch1) {
-               a_sha = dest->oid.hash;
+               a_oid = &dest->oid;
                a_mode = dest->mode;
        } else {
-               b_sha = dest->oid.hash;
+               b_oid = &dest->oid;
                b_mode = dest->mode;
        }
 
        handle_change_delete(o,
                             o->call_depth ? orig->path : dest->path,
-                            orig->oid.hash, orig->mode,
-                            a_sha, a_mode,
-                            b_sha, b_mode,
+                            &orig->oid, orig->mode,
+                            a_oid, a_mode,
+                            b_oid, b_mode,
                             _("rename"), _("renamed"));
 
        if (o->call_depth) {
@@ -1109,11 +1109,11 @@ static struct diff_filespec *filespec_from_entry(struct 
diff_filespec *target,
                                                 struct stage_data *entry,
                                                 int stage)
 {
-       unsigned char *sha = entry->stages[stage].oid.hash;
+       struct object_id *oid = &entry->stages[stage].oid;
        unsigned mode = entry->stages[stage].mode;
-       if (mode == 0 || is_null_sha1(sha))
+       if (mode == 0 || is_null_oid(oid))
                return NULL;
-       hashcpy(target->oid.hash, sha);
+       oidcpy(&target->oid, oid);
        target->mode = mode;
        return target;
 }
@@ -1142,7 +1142,7 @@ static void handle_file(struct merge_options *o,
        add = filespec_from_entry(&other, dst_entry, stage ^ 1);
        if (add) {
                char *add_name = unique_path(o, rename->path, other_branch);
-               update_file(o, 0, add->oid.hash, add->mode, add_name);
+               update_file(o, 0, &add->oid, add->mode, add_name);
 
                remove_file(o, 0, rename->path, 0);
                dst_name = unique_path(o, rename->path, cur_branch);
@@ -1153,7 +1153,7 @@ static void handle_file(struct merge_options *o,
                               rename->path, other_branch, dst_name);
                }
        }
-       update_file(o, 0, rename->oid.hash, rename->mode, dst_name);
+       update_file(o, 0, &rename->oid, rename->mode, dst_name);
        if (stage == 2)
                update_stages(rename->path, NULL, rename, add);
        else
@@ -1182,9 +1182,9 @@ static void conflict_rename_rename_1to2(struct 
merge_options *o,
                struct diff_filespec other;
                struct diff_filespec *add;
                mfi = merge_file_one(o, one->path,
-                                one->oid.hash, one->mode,
-                                a->oid.hash, a->mode,
-                                b->oid.hash, b->mode,
+                                &one->oid, one->mode,
+                                &a->oid, a->mode,
+                                &b->oid, b->mode,
                                 ci->branch1, ci->branch2);
                /*
                 * FIXME: For rename/add-source conflicts (if we could detect
@@ -1192,7 +1192,7 @@ static void conflict_rename_rename_1to2(struct 
merge_options *o,
                 * pathname and then either rename the add-source file to that
                 * unique path, or use that unique path instead of src here.
                 */
-               update_file(o, 0, mfi.oid.hash, mfi.mode, one->path);
+               update_file(o, 0, &mfi.oid, mfi.mode, one->path);
 
                /*
                 * Above, we put the merged content at the merge-base's
@@ -1204,12 +1204,12 @@ static void conflict_rename_rename_1to2(struct 
merge_options *o,
                 */
                add = filespec_from_entry(&other, ci->dst_entry1, 2 ^ 1);
                if (add)
-                       update_file(o, 0, add->oid.hash, add->mode, a->path);
+                       update_file(o, 0, &add->oid, add->mode, a->path);
                else
                        remove_file_from_cache(a->path);
                add = filespec_from_entry(&other, ci->dst_entry2, 3 ^ 1);
                if (add)
-                       update_file(o, 0, add->oid.hash, add->mode, b->path);
+                       update_file(o, 0, &add->oid, add->mode, b->path);
                else
                        remove_file_from_cache(b->path);
        } else {
@@ -1255,16 +1255,16 @@ static void conflict_rename_rename_2to1(struct 
merge_options *o,
                 * again later for the non-recursive merge.
                 */
                remove_file(o, 0, path, 0);
-               update_file(o, 0, mfi_c1.oid.hash, mfi_c1.mode, a->path);
-               update_file(o, 0, mfi_c2.oid.hash, mfi_c2.mode, b->path);
+               update_file(o, 0, &mfi_c1.oid, mfi_c1.mode, a->path);
+               update_file(o, 0, &mfi_c2.oid, mfi_c2.mode, b->path);
        } else {
                char *new_path1 = unique_path(o, path, ci->branch1);
                char *new_path2 = unique_path(o, path, ci->branch2);
                output(o, 1, _("Renaming %s to %s and %s to %s instead"),
                       a->path, new_path1, b->path, new_path2);
                remove_file(o, 0, path, 0);
-               update_file(o, 0, mfi_c1.oid.hash, mfi_c1.mode, new_path1);
-               update_file(o, 0, mfi_c2.oid.hash, mfi_c2.mode, new_path2);
+               update_file(o, 0, &mfi_c1.oid, mfi_c1.mode, new_path1);
+               update_file(o, 0, &mfi_c2.oid, mfi_c2.mode, new_path2);
                free(new_path2);
                free(new_path1);
        }
@@ -1431,7 +1431,7 @@ static int process_renames(struct merge_options *o,
                        dst_other.mode = 
ren1->dst_entry->stages[other_stage].mode;
                        try_merge = 0;
 
-                       if (sha_eq(src_other.oid.hash, null_sha1)) {
+                       if (oid_eq(&src_other.oid, &null_oid)) {
                                setup_rename_conflict_info(RENAME_DELETE,
                                                           ren1->pair,
                                                           NULL,
@@ -1443,7 +1443,7 @@ static int process_renames(struct merge_options *o,
                                                           NULL,
                                                           NULL);
                        } else if ((dst_other.mode == ren1->pair->two->mode) &&
-                                  sha_eq(dst_other.oid.hash, 
ren1->pair->two->oid.hash)) {
+                                  oid_eq(&dst_other.oid, 
&ren1->pair->two->oid)) {
                                /*
                                 * Added file on the other side identical to
                                 * the file being renamed: clean merge.
@@ -1453,12 +1453,12 @@ static int process_renames(struct merge_options *o,
                                 * update_file().
                                 */
                                update_file_flags(o,
-                                                 ren1->pair->two->oid.hash,
+                                                 &ren1->pair->two->oid,
                                                  ren1->pair->two->mode,
                                                  ren1_dst,
                                                  1, /* update_cache */
                                                  0  /* update_wd    */);
-                       } else if (!sha_eq(dst_other.oid.hash, null_sha1)) {
+                       } else if (!oid_eq(&dst_other.oid, &null_oid)) {
                                clean_merge = 0;
                                try_merge = 1;
                                output(o, 1, _("CONFLICT (rename/add): Rename 
%s->%s in %s. "
@@ -1467,20 +1467,20 @@ static int process_renames(struct merge_options *o,
                                       ren1_dst, branch2);
                                if (o->call_depth) {
                                        struct merge_file_info mfi;
-                                       mfi = merge_file_one(o, ren1_dst, 
null_sha1, 0,
-                                                        
ren1->pair->two->oid.hash,
+                                       mfi = merge_file_one(o, ren1_dst, 
&null_oid, 0,
+                                                        &ren1->pair->two->oid,
                                                         ren1->pair->two->mode,
-                                                        dst_other.oid.hash,
+                                                        &dst_other.oid,
                                                         dst_other.mode,
                                                         branch1, branch2);
                                        output(o, 1, _("Adding merged %s"), 
ren1_dst);
-                                       update_file(o, 0, mfi.oid.hash,
+                                       update_file(o, 0, &mfi.oid,
                                                    mfi.mode, ren1_dst);
                                        try_merge = 0;
                                } else {
                                        char *new_path = unique_path(o, 
ren1_dst, branch2);
                                        output(o, 1, _("Adding as %s instead"), 
new_path);
-                                       update_file(o, 0, dst_other.oid.hash,
+                                       update_file(o, 0, &dst_other.oid,
                                                    dst_other.mode, new_path);
                                        free(new_path);
                                }
@@ -1519,30 +1519,30 @@ static int process_renames(struct merge_options *o,
        return clean_merge;
 }
 
-static unsigned char *stage_sha(const unsigned char *sha, unsigned mode)
+static struct object_id *stage_oid(const struct object_id *oid, unsigned mode)
 {
-       return (is_null_sha1(sha) || mode == 0) ? NULL: (unsigned char *)sha;
+       return (is_null_oid(oid) || mode == 0) ? NULL: (struct object_id *)oid;
 }
 
-static int read_sha1_strbuf(const unsigned char *sha1, struct strbuf *dst)
+static int read_oid_strbuf(const struct object_id *oid, struct strbuf *dst)
 {
        void *buf;
        enum object_type type;
        unsigned long size;
-       buf = read_sha1_file(sha1, &type, &size);
+       buf = read_sha1_file(oid->hash, &type, &size);
        if (!buf)
-               return error(_("cannot read object %s"), sha1_to_hex(sha1));
+               return error(_("cannot read object %s"), oid_to_hex(oid));
        if (type != OBJ_BLOB) {
                free(buf);
-               return error(_("object %s is not a blob"), sha1_to_hex(sha1));
+               return error(_("object %s is not a blob"), oid_to_hex(oid));
        }
        strbuf_attach(dst, buf, size, size + 1);
        return 0;
 }
 
-static int blob_unchanged(const unsigned char *o_sha,
+static int blob_unchanged(const struct object_id *o_oid,
                          unsigned o_mode,
-                         const unsigned char *a_sha,
+                         const struct object_id *a_oid,
                          unsigned a_mode,
                          int renormalize, const char *path)
 {
@@ -1552,13 +1552,13 @@ static int blob_unchanged(const unsigned char *o_sha,
 
        if (a_mode != o_mode)
                return 0;
-       if (sha_eq(o_sha, a_sha))
+       if (oid_eq(o_oid, a_oid))
                return 1;
        if (!renormalize)
                return 0;
 
-       assert(o_sha && a_sha);
-       if (read_sha1_strbuf(o_sha, &o) || read_sha1_strbuf(a_sha, &a))
+       assert(o_oid && a_oid);
+       if (read_oid_strbuf(o_oid, &o) || read_oid_strbuf(a_oid, &a))
                goto error_return;
        /*
         * Note: binary | is used so that both renormalizations are
@@ -1577,23 +1577,23 @@ error_return:
 
 static void handle_modify_delete(struct merge_options *o,
                                 const char *path,
-                                unsigned char *o_sha, int o_mode,
-                                unsigned char *a_sha, int a_mode,
-                                unsigned char *b_sha, int b_mode)
+                                struct object_id *o_oid, int o_mode,
+                                struct object_id *a_oid, int a_mode,
+                                struct object_id *b_oid, int b_mode)
 {
        handle_change_delete(o,
                             path,
-                            o_sha, o_mode,
-                            a_sha, a_mode,
-                            b_sha, b_mode,
+                            o_oid, o_mode,
+                            a_oid, a_mode,
+                            b_oid, b_mode,
                             _("modify"), _("modified"));
 }
 
 static int merge_content(struct merge_options *o,
                         const char *path,
-                        unsigned char *o_sha, int o_mode,
-                        unsigned char *a_sha, int a_mode,
-                        unsigned char *b_sha, int b_mode,
+                        struct object_id *o_oid, int o_mode,
+                        struct object_id *a_oid, int a_mode,
+                        struct object_id *b_oid, int b_mode,
                         struct rename_conflict_info *rename_conflict_info)
 {
        const char *reason = _("content");
@@ -1602,16 +1602,16 @@ static int merge_content(struct merge_options *o,
        struct diff_filespec one, a, b;
        unsigned df_conflict_remains = 0;
 
-       if (!o_sha) {
+       if (!o_oid) {
                reason = _("add/add");
-               o_sha = (unsigned char *)null_sha1;
+               o_oid = (struct object_id *)&null_oid;
        }
        one.path = a.path = b.path = (char *)path;
-       hashcpy(one.oid.hash, o_sha);
+       oidcpy(&one.oid, o_oid);
        one.mode = o_mode;
-       hashcpy(a.oid.hash, a_sha);
+       oidcpy(&a.oid, a_oid);
        a.mode = a_mode;
-       hashcpy(b.oid.hash, b_sha);
+       oidcpy(&b.oid, b_oid);
        b.mode = b_mode;
 
        if (rename_conflict_info) {
@@ -1635,7 +1635,7 @@ static int merge_content(struct merge_options *o,
                                         o->branch2, path2);
 
        if (mfi.clean && !df_conflict_remains &&
-           sha_eq(mfi.oid.hash, a_sha) && mfi.mode == a_mode) {
+           oid_eq(&mfi.oid, a_oid) && mfi.mode == a_mode) {
                int path_renamed_outside_HEAD;
                output(o, 3, _("Skipped %s (merged same as existing)"), path);
                /*
@@ -1646,7 +1646,7 @@ static int merge_content(struct merge_options *o,
                 */
                path_renamed_outside_HEAD = !path2 || !strcmp(path, path2);
                if (!path_renamed_outside_HEAD) {
-                       add_cacheinfo(mfi.mode, mfi.oid.hash, path,
+                       add_cacheinfo(mfi.mode, &mfi.oid, path,
                                      0, (!o->call_depth), 0);
                        return mfi.clean;
                }
@@ -1683,11 +1683,11 @@ static int merge_content(struct merge_options *o,
                }
                new_path = unique_path(o, path, rename_conflict_info->branch1);
                output(o, 1, _("Adding as %s instead"), new_path);
-               update_file(o, 0, mfi.oid.hash, mfi.mode, new_path);
+               update_file(o, 0, &mfi.oid, mfi.mode, new_path);
                free(new_path);
                mfi.clean = 0;
        } else {
-               update_file(o, mfi.clean, mfi.oid.hash, mfi.mode, path);
+               update_file(o, mfi.clean, &mfi.oid, mfi.mode, path);
        }
        return mfi.clean;
 
@@ -1702,9 +1702,9 @@ static int process_entry(struct merge_options *o,
        unsigned o_mode = entry->stages[1].mode;
        unsigned a_mode = entry->stages[2].mode;
        unsigned b_mode = entry->stages[3].mode;
-       unsigned char *o_sha = stage_sha(entry->stages[1].oid.hash, o_mode);
-       unsigned char *a_sha = stage_sha(entry->stages[2].oid.hash, a_mode);
-       unsigned char *b_sha = stage_sha(entry->stages[3].oid.hash, b_mode);
+       struct object_id *o_oid = stage_oid(&entry->stages[1].oid, o_mode);
+       struct object_id *a_oid = stage_oid(&entry->stages[2].oid, a_mode);
+       struct object_id *b_oid = stage_oid(&entry->stages[3].oid, b_mode);
 
        entry->processed = 1;
        if (entry->rename_conflict_info) {
@@ -1713,7 +1713,7 @@ static int process_entry(struct merge_options *o,
                case RENAME_NORMAL:
                case RENAME_ONE_FILE_TO_ONE:
                        clean_merge = merge_content(o, path,
-                                                   o_sha, o_mode, a_sha, 
a_mode, b_sha, b_mode,
+                                                   o_oid, o_mode, a_oid, 
a_mode, b_oid, b_mode,
                                                    conflict_info);
                        break;
                case RENAME_DELETE:
@@ -1734,45 +1734,45 @@ static int process_entry(struct merge_options *o,
                        entry->processed = 0;
                        break;
                }
-       } else if (o_sha && (!a_sha || !b_sha)) {
+       } else if (o_oid && (!a_oid || !b_oid)) {
                /* Case A: Deleted in one */
-               if ((!a_sha && !b_sha) ||
-                   (!b_sha && blob_unchanged(o_sha, o_mode, a_sha, a_mode, 
normalize, path)) ||
-                   (!a_sha && blob_unchanged(o_sha, o_mode, b_sha, b_mode, 
normalize, path))) {
+               if ((!a_oid && !b_oid) ||
+                   (!b_oid && blob_unchanged(o_oid, o_mode, a_oid, a_mode, 
normalize, path)) ||
+                   (!a_oid && blob_unchanged(o_oid, o_mode, b_oid, b_mode, 
normalize, path))) {
                        /* Deleted in both or deleted in one and
                         * unchanged in the other */
-                       if (a_sha)
+                       if (a_oid)
                                output(o, 2, _("Removing %s"), path);
                        /* do not touch working file if it did not exist */
-                       remove_file(o, 1, path, !a_sha);
+                       remove_file(o, 1, path, !a_oid);
                } else {
                        /* Modify/delete; deleted side may have put a directory 
in the way */
                        clean_merge = 0;
-                       handle_modify_delete(o, path, o_sha, o_mode,
-                                            a_sha, a_mode, b_sha, b_mode);
+                       handle_modify_delete(o, path, o_oid, o_mode,
+                                            a_oid, a_mode, b_oid, b_mode);
                }
-       } else if ((!o_sha && a_sha && !b_sha) ||
-                  (!o_sha && !a_sha && b_sha)) {
+       } else if ((!o_oid && a_oid && !b_oid) ||
+                  (!o_oid && !a_oid && b_oid)) {
                /* Case B: Added in one. */
                /* [nothing|directory] -> ([nothing|directory], file) */
 
                const char *add_branch;
                const char *other_branch;
                unsigned mode;
-               const unsigned char *sha;
+               const struct object_id *oid;
                const char *conf;
 
-               if (a_sha) {
+               if (a_oid) {
                        add_branch = o->branch1;
                        other_branch = o->branch2;
                        mode = a_mode;
-                       sha = a_sha;
+                       oid = a_oid;
                        conf = _("file/directory");
                } else {
                        add_branch = o->branch2;
                        other_branch = o->branch1;
                        mode = b_mode;
-                       sha = b_sha;
+                       oid = b_oid;
                        conf = _("directory/file");
                }
                if (dir_in_way(path, !o->call_depth)) {
@@ -1781,22 +1781,22 @@ static int process_entry(struct merge_options *o,
                        output(o, 1, _("CONFLICT (%s): There is a directory 
with name %s in %s. "
                               "Adding %s as %s"),
                               conf, path, other_branch, path, new_path);
-                       update_file(o, 0, sha, mode, new_path);
+                       update_file(o, 0, oid, mode, new_path);
                        if (o->call_depth)
                                remove_file_from_cache(path);
                        free(new_path);
                } else {
                        output(o, 2, _("Adding %s"), path);
                        /* do not overwrite file if already present */
-                       update_file_flags(o, sha, mode, path, 1, !a_sha);
+                       update_file_flags(o, oid, mode, path, 1, !a_oid);
                }
-       } else if (a_sha && b_sha) {
+       } else if (a_oid && b_oid) {
                /* Case C: Added in both (check for same permissions) and */
                /* case D: Modified in both, but differently. */
                clean_merge = merge_content(o, path,
-                                           o_sha, o_mode, a_sha, a_mode, 
b_sha, b_mode,
+                                           o_oid, o_mode, a_oid, a_mode, 
b_oid, b_mode,
                                            NULL);
-       } else if (!o_sha && !a_sha && !b_sha) {
+       } else if (!o_oid && !a_oid && !b_oid) {
                /*
                 * this entry was deleted altogether. a_mode == 0 means
                 * we had that path and want to actively remove it.
@@ -1821,7 +1821,7 @@ int merge_trees(struct merge_options *o,
                common = shift_tree_object(head, common, o->subtree_shift);
        }
 
-       if (sha_eq(common->object.oid.hash, merge->object.oid.hash)) {
+       if (oid_eq(&common->object.oid, &merge->object.oid)) {
                output(o, 0, _("Already up-to-date!"));
                *result = head;
                return 1;
--
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