Merge branch 'jh/fsck-promisors'
[git/git.git] / sha1_file.c
index b0735dc..cc0f43e 100644 (file)
@@ -24,7 +24,6 @@
 #include "bulk-checkin.h"
 #include "streaming.h"
 #include "dir.h"
-#include "mru.h"
 #include "list.h"
 #include "mergesort.h"
 #include "quote.h"
@@ -40,6 +39,62 @@ const struct object_id empty_blob_oid = {
        EMPTY_BLOB_SHA1_BIN_LITERAL
 };
 
+static void git_hash_sha1_init(git_hash_ctx *ctx)
+{
+       git_SHA1_Init(&ctx->sha1);
+}
+
+static void git_hash_sha1_update(git_hash_ctx *ctx, const void *data, size_t len)
+{
+       git_SHA1_Update(&ctx->sha1, data, len);
+}
+
+static void git_hash_sha1_final(unsigned char *hash, git_hash_ctx *ctx)
+{
+       git_SHA1_Final(hash, &ctx->sha1);
+}
+
+static void git_hash_unknown_init(git_hash_ctx *ctx)
+{
+       die("trying to init unknown hash");
+}
+
+static void git_hash_unknown_update(git_hash_ctx *ctx, const void *data, size_t len)
+{
+       die("trying to update unknown hash");
+}
+
+static void git_hash_unknown_final(unsigned char *hash, git_hash_ctx *ctx)
+{
+       die("trying to finalize unknown hash");
+}
+
+const struct git_hash_algo hash_algos[GIT_HASH_NALGOS] = {
+       {
+               NULL,
+               0x00000000,
+               0,
+               0,
+               git_hash_unknown_init,
+               git_hash_unknown_update,
+               git_hash_unknown_final,
+               NULL,
+               NULL,
+       },
+       {
+               "sha-1",
+               /* "sha1", big-endian */
+               0x73686131,
+               GIT_SHA1_RAWSZ,
+               GIT_SHA1_HEXSZ,
+               git_hash_sha1_init,
+               git_hash_sha1_update,
+               git_hash_sha1_final,
+               &empty_tree_oid,
+               &empty_blob_oid,
+       },
+};
+
 /*
  * This is meant to hold a *small* number of objects that you would
  * want read_sha1_file() to be able to return, but yet you do not want
@@ -75,6 +130,18 @@ static struct cached_object *find_cached_object(const unsigned char *sha1)
        return NULL;
 }
 
+
+static int get_conv_flags(unsigned flags)
+{
+       if (flags & HASH_RENORMALIZE)
+               return CONV_EOL_RENORMALIZE;
+       else if (flags & HASH_WRITE_OBJECT)
+         return global_conv_flags_eol;
+       else
+               return 0;
+}
+
+
 int mkdir_in_gitdir(const char *path)
 {
        if (mkdir(path, 0777)) {
@@ -252,15 +319,11 @@ static void fill_sha1_path(struct strbuf *buf, const unsigned char *sha1)
        }
 }
 
-const char *sha1_file_name(const unsigned char *sha1)
+void sha1_file_name(struct strbuf *buf, const unsigned char *sha1)
 {
-       static struct strbuf buf = STRBUF_INIT;
-
-       strbuf_reset(&buf);
-       strbuf_addf(&buf, "%s/", get_object_directory());
-
-       fill_sha1_path(&buf, sha1);
-       return buf.buf;
+       strbuf_addstr(buf, get_object_directory());
+       strbuf_addch(buf, '/');
+       fill_sha1_path(buf, sha1);
 }
 
 struct strbuf *alt_scratch_buf(struct alternate_object_database *alt)
@@ -405,6 +468,9 @@ static void link_alt_odb_entries(const char *alt, int sep,
        struct strbuf objdirbuf = STRBUF_INIT;
        struct strbuf entry = STRBUF_INIT;
 
+       if (!alt || !*alt)
+               return;
+
        if (depth > 5) {
                error("%s: ignoring alternate object stores, nesting too deep.",
                                relative_base);
@@ -457,19 +523,19 @@ struct alternate_object_database *alloc_alt_odb(const char *dir)
 
 void add_to_alternates_file(const char *reference)
 {
-       struct lock_file *lock = xcalloc(1, sizeof(struct lock_file));
+       struct lock_file lock = LOCK_INIT;
        char *alts = git_pathdup("objects/info/alternates");
        FILE *in, *out;
+       int found = 0;
 
-       hold_lock_file_for_update(lock, alts, LOCK_DIE_ON_ERROR);
-       out = fdopen_lock_file(lock, "w");
+       hold_lock_file_for_update(&lock, alts, LOCK_DIE_ON_ERROR);
+       out = fdopen_lock_file(&lock, "w");
        if (!out)
                die_errno("unable to fdopen alternates lockfile");
 
        in = fopen(alts, "r");
        if (in) {
                struct strbuf line = STRBUF_INIT;
-               int found = 0;
 
                while (strbuf_getline(&line, in) != EOF) {
                        if (!strcmp(reference, line.buf)) {
@@ -481,18 +547,15 @@ void add_to_alternates_file(const char *reference)
 
                strbuf_release(&line);
                fclose(in);
-
-               if (found) {
-                       rollback_lock_file(lock);
-                       lock = NULL;
-               }
        }
        else if (errno != ENOENT)
                die_errno("unable to read alternates file");
 
-       if (lock) {
+       if (found) {
+               rollback_lock_file(&lock);
+       } else {
                fprintf_or_die(out, "%s\n", reference);
-               if (commit_lock_file(lock))
+               if (commit_lock_file(&lock))
                        die_errno("unable to move new alternates file into place");
                if (alt_odb_tail)
                        link_alt_odb_entries(reference, '\n', NULL, 0);
@@ -608,7 +671,6 @@ void prepare_alt_odb(void)
                return;
 
        alt = getenv(ALTERNATE_DB_ENVIRONMENT);
-       if (!alt) alt = "";
 
        alt_odb_tail = &alt_odb_list;
        link_alt_odb_entries(alt, PATH_SEP, NULL, 0);
@@ -642,7 +704,12 @@ int check_and_freshen_file(const char *fn, int freshen)
 
 static int check_and_freshen_local(const unsigned char *sha1, int freshen)
 {
-       return check_and_freshen_file(sha1_file_name(sha1), freshen);
+       static struct strbuf buf = STRBUF_INIT;
+
+       strbuf_reset(&buf);
+       sha1_file_name(&buf, sha1);
+
+       return check_and_freshen_file(buf.buf, freshen);
 }
 
 static int check_and_freshen_nonlocal(const unsigned char *sha1, int freshen)
@@ -720,16 +787,16 @@ void *xmmap(void *start, size_t length,
 int check_sha1_signature(const unsigned char *sha1, void *map,
                         unsigned long size, const char *type)
 {
-       unsigned char real_sha1[20];
+       struct object_id real_oid;
        enum object_type obj_type;
        struct git_istream *st;
-       git_SHA_CTX c;
+       git_hash_ctx c;
        char hdr[32];
        int hdrlen;
 
        if (map) {
-               hash_sha1_file(map, size, type, real_sha1);
-               return hashcmp(sha1, real_sha1) ? -1 : 0;
+               hash_object_file(map, size, type, &real_oid);
+               return hashcmp(sha1, real_oid.hash) ? -1 : 0;
        }
 
        st = open_istream(sha1, &obj_type, &size, NULL);
@@ -737,11 +804,11 @@ int check_sha1_signature(const unsigned char *sha1, void *map,
                return -1;
 
        /* Generate the header */
-       hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(obj_type), size) + 1;
+       hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", type_name(obj_type), size) + 1;
 
        /* Sha1.. */
-       git_SHA1_Init(&c);
-       git_SHA1_Update(&c, hdr, hdrlen);
+       the_hash_algo->init_fn(&c);
+       the_hash_algo->update_fn(&c, hdr, hdrlen);
        for (;;) {
                char buf[1024 * 16];
                ssize_t readlen = read_istream(st, buf, sizeof(buf));
@@ -752,11 +819,11 @@ int check_sha1_signature(const unsigned char *sha1, void *map,
                }
                if (!readlen)
                        break;
-               git_SHA1_Update(&c, buf, readlen);
+               the_hash_algo->update_fn(&c, buf, readlen);
        }
-       git_SHA1_Final(real_sha1, &c);
+       the_hash_algo->final_fn(real_oid.hash, &c);
        close_istream(st);
-       return hashcmp(sha1, real_sha1) ? -1 : 0;
+       return hashcmp(sha1, real_oid.hash) ? -1 : 0;
 }
 
 int git_open_cloexec(const char *name, int flags)
@@ -798,8 +865,12 @@ static int stat_sha1_file(const unsigned char *sha1, struct stat *st,
                          const char **path)
 {
        struct alternate_object_database *alt;
+       static struct strbuf buf = STRBUF_INIT;
+
+       strbuf_reset(&buf);
+       sha1_file_name(&buf, sha1);
+       *path = buf.buf;
 
-       *path = sha1_file_name(sha1);
        if (!lstat(*path, st))
                return 0;
 
@@ -823,8 +894,12 @@ static int open_sha1_file(const unsigned char *sha1, const char **path)
        int fd;
        struct alternate_object_database *alt;
        int most_interesting_errno;
+       static struct strbuf buf = STRBUF_INIT;
+
+       strbuf_reset(&buf);
+       sha1_file_name(&buf, sha1);
+       *path = buf.buf;
 
-       *path = sha1_file_name(sha1);
        fd = git_open(*path);
        if (fd >= 0)
                return fd;
@@ -1019,8 +1094,8 @@ static int parse_sha1_header_extended(const char *hdr, struct object_info *oi,
        }
 
        type = type_from_string_gently(type_buf, type_len, 1);
-       if (oi->typename)
-               strbuf_add(oi->typename, type_buf, type_len);
+       if (oi->type_name)
+               strbuf_add(oi->type_name, type_buf, type_len);
        /*
         * Set type to 0 if its an unknown object and
         * we're obtaining the type using '--allow-unknown-type'
@@ -1090,7 +1165,7 @@ static int sha1_loose_object_info(const unsigned char *sha1,
         * return value implicitly indicates whether the
         * object even exists.
         */
-       if (!oi->typep && !oi->typename && !oi->sizep && !oi->contentp) {
+       if (!oi->typep && !oi->type_name && !oi->sizep && !oi->contentp) {
                const char *path;
                struct stat st;
                if (stat_sha1_file(sha1, &st, &path) < 0)
@@ -1157,6 +1232,9 @@ int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi,
                                    sha1;
        int already_retried = 0;
 
+       if (is_null_sha1(real))
+               return -1;
+
        if (!oi)
                oi = &blank_oi;
 
@@ -1171,8 +1249,8 @@ int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi,
                                *(oi->disk_sizep) = 0;
                        if (oi->delta_base_sha1)
                                hashclr(oi->delta_base_sha1);
-                       if (oi->typename)
-                               strbuf_addstr(oi->typename, typename(co->type));
+                       if (oi->type_name)
+                               strbuf_addstr(oi->type_name, type_name(co->type));
                        if (oi->contentp)
                                *oi->contentp = xmemdupz(co->buf, co->size);
                        oi->whence = OI_CACHED;
@@ -1258,13 +1336,13 @@ static void *read_object(const unsigned char *sha1, enum object_type *type,
        return content;
 }
 
-int pretend_sha1_file(void *buf, unsigned long len, enum object_type type,
-                     unsigned char *sha1)
+int pretend_object_file(void *buf, unsigned long len, enum object_type type,
+                       struct object_id *oid)
 {
        struct cached_object *co;
 
-       hash_sha1_file(buf, len, typename(type), sha1);
-       if (has_sha1_file(sha1) || find_cached_object(sha1))
+       hash_object_file(buf, len, type_name(type), oid);
+       if (has_sha1_file(oid->hash) || find_cached_object(oid->hash))
                return 0;
        ALLOC_GROW(cached_objects, cached_object_nr + 1, cached_object_alloc);
        co = &cached_objects[cached_object_nr++];
@@ -1272,7 +1350,7 @@ int pretend_sha1_file(void *buf, unsigned long len, enum object_type type,
        co->type = type;
        co->buf = xmalloc(len);
        memcpy(co->buf, buf, len);
-       hashcpy(co->sha1, sha1);
+       hashcpy(co->sha1, oid->hash);
        return 0;
 }
 
@@ -1365,20 +1443,20 @@ void *read_object_with_reference(const unsigned char *sha1,
        }
 }
 
-static void write_sha1_file_prepare(const void *buf, unsigned long len,
-                                    const char *type, unsigned char *sha1,
-                                    char *hdr, int *hdrlen)
+static void write_object_file_prepare(const void *buf, unsigned long len,
+                                     const char *type, struct object_id *oid,
+                                     char *hdr, int *hdrlen)
 {
-       git_SHA_CTX c;
+       git_hash_ctx c;
 
        /* Generate the header */
        *hdrlen = xsnprintf(hdr, *hdrlen, "%s %lu", type, len)+1;
 
        /* Sha1.. */
-       git_SHA1_Init(&c);
-       git_SHA1_Update(&c, hdr, *hdrlen);
-       git_SHA1_Update(&c, buf, len);
-       git_SHA1_Final(sha1, &c);
+       the_hash_algo->init_fn(&c);
+       the_hash_algo->update_fn(&c, hdr, *hdrlen);
+       the_hash_algo->update_fn(&c, buf, len);
+       the_hash_algo->final_fn(oid->hash, &c);
 }
 
 /*
@@ -1431,12 +1509,12 @@ static int write_buffer(int fd, const void *buf, size_t len)
        return 0;
 }
 
-int hash_sha1_file(const void *buf, unsigned long len, const char *type,
-                   unsigned char *sha1)
+int hash_object_file(const void *buf, unsigned long len, const char *type,
+                    struct object_id *oid)
 {
        char hdr[32];
        int hdrlen = sizeof(hdr);
-       write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
+       write_object_file_prepare(buf, len, type, oid, hdr, &hdrlen);
        return 0;
 }
 
@@ -1494,18 +1572,22 @@ static int create_tmpfile(struct strbuf *tmp, const char *filename)
        return fd;
 }
 
-static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen,
-                             const void *buf, unsigned long len, time_t mtime)
+static int write_loose_object(const struct object_id *oid, char *hdr,
+                             int hdrlen, const void *buf, unsigned long len,
+                             time_t mtime)
 {
        int fd, ret;
        unsigned char compressed[4096];
        git_zstream stream;
-       git_SHA_CTX c;
-       unsigned char parano_sha1[20];
+       git_hash_ctx c;
+       struct object_id parano_oid;
        static struct strbuf tmp_file = STRBUF_INIT;
-       const char *filename = sha1_file_name(sha1);
+       static struct strbuf filename = STRBUF_INIT;
+
+       strbuf_reset(&filename);
+       sha1_file_name(&filename, oid->hash);
 
-       fd = create_tmpfile(&tmp_file, filename);
+       fd = create_tmpfile(&tmp_file, filename.buf);
        if (fd < 0) {
                if (errno == EACCES)
                        return error("insufficient permission for adding an object to repository database %s", get_object_directory());
@@ -1517,14 +1599,14 @@ static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen,
        git_deflate_init(&stream, zlib_compression_level);
        stream.next_out = compressed;
        stream.avail_out = sizeof(compressed);
-       git_SHA1_Init(&c);
+       the_hash_algo->init_fn(&c);
 
        /* First header.. */
        stream.next_in = (unsigned char *)hdr;
        stream.avail_in = hdrlen;
        while (git_deflate(&stream, 0) == Z_OK)
                ; /* nothing */
-       git_SHA1_Update(&c, hdr, hdrlen);
+       the_hash_algo->update_fn(&c, hdr, hdrlen);
 
        /* Then the data itself.. */
        stream.next_in = (void *)buf;
@@ -1532,7 +1614,7 @@ static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen,
        do {
                unsigned char *in0 = stream.next_in;
                ret = git_deflate(&stream, Z_FINISH);
-               git_SHA1_Update(&c, in0, stream.next_in - in0);
+               the_hash_algo->update_fn(&c, in0, stream.next_in - in0);
                if (write_buffer(fd, compressed, stream.next_out - compressed) < 0)
                        die("unable to write sha1 file");
                stream.next_out = compressed;
@@ -1540,13 +1622,16 @@ static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen,
        } while (ret == Z_OK);
 
        if (ret != Z_STREAM_END)
-               die("unable to deflate new object %s (%d)", sha1_to_hex(sha1), ret);
+               die("unable to deflate new object %s (%d)", oid_to_hex(oid),
+                   ret);
        ret = git_deflate_end_gently(&stream);
        if (ret != Z_OK)
-               die("deflateEnd on object %s failed (%d)", sha1_to_hex(sha1), ret);
-       git_SHA1_Final(parano_sha1, &c);
-       if (hashcmp(sha1, parano_sha1) != 0)
-               die("confused by unstable object source data for %s", sha1_to_hex(sha1));
+               die("deflateEnd on object %s failed (%d)", oid_to_hex(oid),
+                   ret);
+       the_hash_algo->final_fn(parano_oid.hash, &c);
+       if (oidcmp(oid, &parano_oid) != 0)
+               die("confused by unstable object source data for %s",
+                   oid_to_hex(oid));
 
        close_sha1_file(fd);
 
@@ -1558,7 +1643,7 @@ static int write_loose_object(const unsigned char *sha1, char *hdr, int hdrlen,
                        warning_errno("failed utime() on %s", tmp_file.buf);
        }
 
-       return finalize_object_file(tmp_file.buf, filename);
+       return finalize_object_file(tmp_file.buf, filename.buf);
 }
 
 static int freshen_loose_object(const unsigned char *sha1)
@@ -1579,7 +1664,8 @@ static int freshen_packed_object(const unsigned char *sha1)
        return 1;
 }
 
-int write_sha1_file(const void *buf, unsigned long len, const char *type, unsigned char *sha1)
+int write_object_file(const void *buf, unsigned long len, const char *type,
+                     struct object_id *oid)
 {
        char hdr[32];
        int hdrlen = sizeof(hdr);
@@ -1587,14 +1673,15 @@ int write_sha1_file(const void *buf, unsigned long len, const char *type, unsign
        /* Normally if we have it in the pack then we do not bother writing
         * it out into .git/objects/??/?{38} file.
         */
-       write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
-       if (freshen_packed_object(sha1) || freshen_loose_object(sha1))
+       write_object_file_prepare(buf, len, type, oid, hdr, &hdrlen);
+       if (freshen_packed_object(oid->hash) || freshen_loose_object(oid->hash))
                return 0;
-       return write_loose_object(sha1, hdr, hdrlen, buf, len, 0);
+       return write_loose_object(oid, hdr, hdrlen, buf, len, 0);
 }
 
-int hash_sha1_file_literally(const void *buf, unsigned long len, const char *type,
-                            struct object_id *oid, unsigned flags)
+int hash_object_file_literally(const void *buf, unsigned long len,
+                              const char *type, struct object_id *oid,
+                              unsigned flags)
 {
        char *header;
        int hdrlen, status = 0;
@@ -1602,20 +1689,20 @@ int hash_sha1_file_literally(const void *buf, unsigned long len, const char *typ
        /* type string, SP, %lu of the length plus NUL must fit this */
        hdrlen = strlen(type) + 32;
        header = xmalloc(hdrlen);
-       write_sha1_file_prepare(buf, len, type, oid->hash, header, &hdrlen);
+       write_object_file_prepare(buf, len, type, oid, header, &hdrlen);
 
        if (!(flags & HASH_WRITE_OBJECT))
                goto cleanup;
        if (freshen_packed_object(oid->hash) || freshen_loose_object(oid->hash))
                goto cleanup;
-       status = write_loose_object(oid->hash, header, hdrlen, buf, len, 0);
+       status = write_loose_object(oid, header, hdrlen, buf, len, 0);
 
 cleanup:
        free(header);
        return status;
 }
 
-int force_object_loose(const unsigned char *sha1, time_t mtime)
+int force_object_loose(const struct object_id *oid, time_t mtime)
 {
        void *buf;
        unsigned long len;
@@ -1624,13 +1711,13 @@ int force_object_loose(const unsigned char *sha1, time_t mtime)
        int hdrlen;
        int ret;
 
-       if (has_loose_object(sha1))
+       if (has_loose_object(oid->hash))
                return 0;
-       buf = read_object(sha1, &type, &len);
+       buf = read_object(oid->hash, &type, &len);
        if (!buf)
-               return error("cannot read sha1_file for %s", sha1_to_hex(sha1));
-       hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", typename(type), len) + 1;
-       ret = write_loose_object(sha1, hdr, hdrlen, buf, len, mtime);
+               return error("cannot read sha1_file for %s", oid_to_hex(oid));
+       hdrlen = xsnprintf(hdr, sizeof(hdr), "%s %lu", type_name(type), len) + 1;
+       ret = write_loose_object(oid, hdr, hdrlen, buf, len, mtime);
        free(buf);
 
        return ret;
@@ -1682,7 +1769,7 @@ static void check_tag(const void *buf, size_t size)
                die("corrupt tag");
 }
 
-static int index_mem(unsigned char *sha1, void *buf, size_t size,
+static int index_mem(struct object_id *oid, void *buf, size_t size,
                     enum object_type type,
                     const char *path, unsigned flags)
 {
@@ -1698,7 +1785,7 @@ static int index_mem(unsigned char *sha1, void *buf, size_t size,
        if ((type == OBJ_BLOB) && path) {
                struct strbuf nbuf = STRBUF_INIT;
                if (convert_to_git(&the_index, path, buf, size, &nbuf,
-                                  write_object ? safe_crlf : SAFE_CRLF_FALSE)) {
+                                  get_conv_flags(flags))) {
                        buf = strbuf_detach(&nbuf, &size);
                        re_allocated = 1;
                }
@@ -1713,15 +1800,15 @@ static int index_mem(unsigned char *sha1, void *buf, size_t size,
        }
 
        if (write_object)
-               ret = write_sha1_file(buf, size, typename(type), sha1);
+               ret = write_object_file(buf, size, type_name(type), oid);
        else
-               ret = hash_sha1_file(buf, size, typename(type), sha1);
+               ret = hash_object_file(buf, size, type_name(type), oid);
        if (re_allocated)
                free(buf);
        return ret;
 }
 
-static int index_stream_convert_blob(unsigned char *sha1, int fd,
+static int index_stream_convert_blob(struct object_id *oid, int fd,
                                     const char *path, unsigned flags)
 {
        int ret;
@@ -1732,26 +1819,26 @@ static int index_stream_convert_blob(unsigned char *sha1, int fd,
        assert(would_convert_to_git_filter_fd(path));
 
        convert_to_git_filter_fd(&the_index, path, fd, &sbuf,
-                                write_object ? safe_crlf : SAFE_CRLF_FALSE);
+                                get_conv_flags(flags));
 
        if (write_object)
-               ret = write_sha1_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB),
-                                     sha1);
+               ret = write_object_file(sbuf.buf, sbuf.len, type_name(OBJ_BLOB),
+                                       oid);
        else
-               ret = hash_sha1_file(sbuf.buf, sbuf.len, typename(OBJ_BLOB),
-                                    sha1);
+               ret = hash_object_file(sbuf.buf, sbuf.len, type_name(OBJ_BLOB),
+                                      oid);
        strbuf_release(&sbuf);
        return ret;
 }
 
-static int index_pipe(unsigned char *sha1, int fd, enum object_type type,
+static int index_pipe(struct object_id *oid, int fd, enum object_type type,
                      const char *path, unsigned flags)
 {
        struct strbuf sbuf = STRBUF_INIT;
        int ret;
 
        if (strbuf_read(&sbuf, fd, 4096) >= 0)
-               ret = index_mem(sha1, sbuf.buf, sbuf.len, type, path, flags);
+               ret = index_mem(oid, sbuf.buf, sbuf.len, type, path, flags);
        else
                ret = -1;
        strbuf_release(&sbuf);
@@ -1760,14 +1847,14 @@ static int index_pipe(unsigned char *sha1, int fd, enum object_type type,
 
 #define SMALL_FILE_SIZE (32*1024)
 
-static int index_core(unsigned char *sha1, int fd, size_t size,
+static int index_core(struct object_id *oid, int fd, size_t size,
                      enum object_type type, const char *path,
                      unsigned flags)
 {
        int ret;
 
        if (!size) {
-               ret = index_mem(sha1, "", size, type, path, flags);
+               ret = index_mem(oid, "", size, type, path, flags);
        } else if (size <= SMALL_FILE_SIZE) {
                char *buf = xmalloc(size);
                ssize_t read_result = read_in_full(fd, buf, size);
@@ -1778,11 +1865,11 @@ static int index_core(unsigned char *sha1, int fd, size_t size,
                        ret = error("short read while indexing %s",
                                    path ? path : "<unknown>");
                else
-                       ret = index_mem(sha1, buf, size, type, path, flags);
+                       ret = index_mem(oid, buf, size, type, path, flags);
                free(buf);
        } else {
                void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
-               ret = index_mem(sha1, buf, size, type, path, flags);
+               ret = index_mem(oid, buf, size, type, path, flags);
                munmap(buf, size);
        }
        return ret;
@@ -1820,12 +1907,12 @@ int index_fd(struct object_id *oid, int fd, struct stat *st,
         * die() for large files.
         */
        if (type == OBJ_BLOB && path && would_convert_to_git_filter_fd(path))
-               ret = index_stream_convert_blob(oid->hash, fd, path, flags);
+               ret = index_stream_convert_blob(oid, fd, path, flags);
        else if (!S_ISREG(st->st_mode))
-               ret = index_pipe(oid->hash, fd, type, path, flags);
+               ret = index_pipe(oid, fd, type, path, flags);
        else if (st->st_size <= big_file_threshold || type != OBJ_BLOB ||
                 (path && would_convert_to_git(&the_index, path)))
-               ret = index_core(oid->hash, fd, xsize_t(st->st_size), type, path,
+               ret = index_core(oid, fd, xsize_t(st->st_size), type, path,
                                 flags);
        else
                ret = index_stream(oid, fd, xsize_t(st->st_size), type, path,
@@ -1853,13 +1940,13 @@ int index_path(struct object_id *oid, const char *path, struct stat *st, unsigne
                if (strbuf_readlink(&sb, path, st->st_size))
                        return error_errno("readlink(\"%s\")", path);
                if (!(flags & HASH_WRITE_OBJECT))
-                       hash_sha1_file(sb.buf, sb.len, blob_type, oid->hash);
-               else if (write_sha1_file(sb.buf, sb.len, blob_type, oid->hash))
+                       hash_object_file(sb.buf, sb.len, blob_type, oid);
+               else if (write_object_file(sb.buf, sb.len, blob_type, oid))
                        rc = error("%s: failed to insert into database", path);
                strbuf_release(&sb);
                break;
        case S_IFDIR:
-               return resolve_gitlink_ref(path, "HEAD", oid->hash);
+               return resolve_gitlink_ref(path, "HEAD", oid);
        default:
                return error("%s: unsupported file type", path);
        }
@@ -1888,7 +1975,7 @@ void assert_sha1_type(const unsigned char *sha1, enum object_type expect)
                die("%s is not a valid object", sha1_to_hex(sha1));
        if (type != expect)
                die("%s is not a valid '%s' object", sha1_to_hex(sha1),
-                   typename(expect));
+                   type_name(expect));
 }
 
 int for_each_file_in_obj_subdir(unsigned int subdir_nr,
@@ -1902,6 +1989,7 @@ int for_each_file_in_obj_subdir(unsigned int subdir_nr,
        DIR *dir;
        struct dirent *de;
        int r = 0;
+       struct object_id oid;
 
        if (subdir_nr > 0xff)
                BUG("invalid loose object subdirectory: %x", subdir_nr);
@@ -1909,7 +1997,6 @@ int for_each_file_in_obj_subdir(unsigned int subdir_nr,
        origlen = path->len;
        strbuf_complete(path, '/');
        strbuf_addf(path, "%02x", subdir_nr);
-       baselen = path->len;
 
        dir = opendir(path->buf);
        if (!dir) {
@@ -1919,27 +2006,27 @@ int for_each_file_in_obj_subdir(unsigned int subdir_nr,
                return r;
        }
 
+       oid.hash[0] = subdir_nr;
+       strbuf_addch(path, '/');
+       baselen = path->len;
+
        while ((de = readdir(dir))) {
+               size_t namelen;
                if (is_dot_or_dotdot(de->d_name))
                        continue;
 
+               namelen = strlen(de->d_name);
                strbuf_setlen(path, baselen);
-               strbuf_addf(path, "/%s", de->d_name);
-
-               if (strlen(de->d_name) == GIT_SHA1_HEXSZ - 2)  {
-                       char hex[GIT_MAX_HEXSZ+1];
-                       struct object_id oid;
-
-                       xsnprintf(hex, sizeof(hex), "%02x%s",
-                                 subdir_nr, de->d_name);
-                       if (!get_oid_hex(hex, &oid)) {
-                               if (obj_cb) {
-                                       r = obj_cb(&oid, path->buf, data);
-                                       if (r)
-                                               break;
-                               }
-                               continue;
+               strbuf_add(path, de->d_name, namelen);
+               if (namelen == GIT_SHA1_HEXSZ - 2 &&
+                   !hex_to_bytes(oid.hash + 1, de->d_name,
+                                 GIT_SHA1_RAWSZ - 1)) {
+                       if (obj_cb) {
+                               r = obj_cb(&oid, path->buf, data);
+                               if (r)
+                                       break;
                        }
+                       continue;
                }
 
                if (cruft_cb) {
@@ -1950,7 +2037,7 @@ int for_each_file_in_obj_subdir(unsigned int subdir_nr,
        }
        closedir(dir);
 
-       strbuf_setlen(path, baselen);
+       strbuf_setlen(path, baselen - 1);
        if (!r && subdir_cb)
                r = subdir_cb(subdir_nr, path->buf, data);
 
@@ -2039,14 +2126,14 @@ static int check_stream_sha1(git_zstream *stream,
                             const char *path,
                             const unsigned char *expected_sha1)
 {
-       git_SHA_CTX c;
+       git_hash_ctx c;
        unsigned char real_sha1[GIT_MAX_RAWSZ];
        unsigned char buf[4096];
        unsigned long total_read;
        int status = Z_OK;
 
-       git_SHA1_Init(&c);
-       git_SHA1_Update(&c, hdr, stream->total_out);
+       the_hash_algo->init_fn(&c);
+       the_hash_algo->update_fn(&c, hdr, stream->total_out);
 
        /*
         * We already read some bytes into hdr, but the ones up to the NUL
@@ -2065,7 +2152,7 @@ static int check_stream_sha1(git_zstream *stream,
                if (size - total_read < stream->avail_out)
                        stream->avail_out = size - total_read;
                status = git_inflate(stream, Z_FINISH);
-               git_SHA1_Update(&c, buf, stream->next_out - buf);
+               the_hash_algo->update_fn(&c, buf, stream->next_out - buf);
                total_read += stream->next_out - buf;
        }
        git_inflate_end(stream);
@@ -2080,7 +2167,7 @@ static int check_stream_sha1(git_zstream *stream,
                return -1;
        }
 
-       git_SHA1_Final(real_sha1, &c);
+       the_hash_algo->final_fn(real_sha1, &c);
        if (hashcmp(expected_sha1, real_sha1)) {
                error("sha1 mismatch for %s (expected %s)", path,
                      sha1_to_hex(expected_sha1));
@@ -2133,7 +2220,7 @@ int read_loose_object(const char *path,
                        goto out;
                }
                if (check_sha1_signature(expected_sha1, *contents,
-                                        *size, typename(*type))) {
+                                        *size, type_name(*type))) {
                        error("sha1 mismatch for %s (expected %s)", path,
                              sha1_to_hex(expected_sha1));
                        free(*contents);