1 files changed, 157 insertions, 2048 deletions

diff --git a/sha1_file.c b/sha1_file.c
index 59a4ed2ed3..36f85455e6 100644
--- a/sha1_file.c
+++ b/sha1_file.c
@@ -7,6 +7,7 @@
  * creation etc.
  */
 #include "cache.h"
+#include "config.h"
 #include "string-list.h"
 #include "lockfile.h"
 #include "delta.h"
@@ -27,11 +28,9 @@
 #include "list.h"
 #include "mergesort.h"
 #include "quote.h"
+#include "packfile.h"
 
-#define SZ_FMT PRIuMAX
-static inline uintmax_t sz_fmt(size_t s) { return s; }
-
-const unsigned char null_sha1[20];
+const unsigned char null_sha1[GIT_MAX_RAWSZ];
 const struct object_id null_oid;
 const struct object_id empty_tree_oid = {
 	EMPTY_TREE_SHA1_BIN_LITERAL
@@ -277,28 +276,6 @@ static const char *alt_sha1_path(struct alternate_object_database *alt,
 	return buf->buf;
 }
 
- char *odb_pack_name(struct strbuf *buf,
-		     const unsigned char *sha1,
-		     const char *ext)
-{
-	strbuf_reset(buf);
-	strbuf_addf(buf, "%s/pack/pack-%s.%s", get_object_directory(),
-		    sha1_to_hex(sha1), ext);
-	return buf->buf;
-}
-
-char *sha1_pack_name(const unsigned char *sha1)
-{
-	static struct strbuf buf = STRBUF_INIT;
-	return odb_pack_name(&buf, sha1, "pack");
-}
-
-char *sha1_pack_index_name(const unsigned char *sha1)
-{
-	static struct strbuf buf = STRBUF_INIT;
-	return odb_pack_name(&buf, sha1, "idx");
-}
-
 struct alternate_object_database *alt_odb_list;
 static struct alternate_object_database **alt_odb_tail;
 
@@ -346,6 +323,7 @@ static int alt_odb_usable(struct strbuf *path, const char *normalized_objdir)
  * SHA1, an extra slash for the first level indirection, and the
  * terminating NUL.
  */
+static void read_info_alternates(const char * relative_base, int depth);
 static int link_alt_odb_entry(const char *entry, const char *relative_base,
 	int depth, const char *normalized_objdir)
 {
@@ -420,12 +398,15 @@ static const char *parse_alt_odb_entry(const char *string,
 	return end;
 }
 
-static void link_alt_odb_entries(const char *alt, int len, int sep,
+static void link_alt_odb_entries(const char *alt, int sep,
 				 const char *relative_base, int depth)
 {
 	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);
@@ -447,30 +428,21 @@ static void link_alt_odb_entries(const char *alt, int len, int sep,
 	strbuf_release(&objdirbuf);
 }
 
-void read_info_alternates(const char * relative_base, int depth)
+static void read_info_alternates(const char * relative_base, int depth)
 {
-	char *map;
-	size_t mapsz;
-	struct stat st;
 	char *path;
-	int fd;
+	struct strbuf buf = STRBUF_INIT;
 
 	path = xstrfmt("%s/info/alternates", relative_base);
-	fd = git_open(path);
-	free(path);
-	if (fd < 0)
-		return;
-	if (fstat(fd, &st) || (st.st_size == 0)) {
-		close(fd);
+	if (strbuf_read_file(&buf, path, 1024) < 0) {
+		warn_on_fopen_errors(path);
+		free(path);
 		return;
 	}
-	mapsz = xsize_t(st.st_size);
-	map = xmmap(NULL, mapsz, PROT_READ, MAP_PRIVATE, fd, 0);
-	close(fd);
-
-	link_alt_odb_entries(map, mapsz, '\n', relative_base, depth);
 
-	munmap(map, mapsz);
+	link_alt_odb_entries(buf.buf, '\n', relative_base, depth);
+	strbuf_release(&buf);
+	free(path);
 }
 
 struct alternate_object_database *alloc_alt_odb(const char *dir)
@@ -525,7 +497,7 @@ void add_to_alternates_file(const char *reference)
 		if (commit_lock_file(lock))
 			die_errno("unable to move new alternates file into place");
 		if (alt_odb_tail)
-			link_alt_odb_entries(reference, strlen(reference), '\n', NULL, 0);
+			link_alt_odb_entries(reference, '\n', NULL, 0);
 	}
 	free(alts);
 }
@@ -538,7 +510,7 @@ void add_to_alternates_memory(const char *reference)
 	 */
 	prepare_alt_odb();
 
-	link_alt_odb_entries(reference, strlen(reference), '\n', NULL, 0);
+	link_alt_odb_entries(reference, '\n', NULL, 0);
 }
 
 /*
@@ -610,8 +582,7 @@ char *compute_alternate_path(const char *path, struct strbuf *err)
 
 out:
 	if (seen_error) {
-		free(ref_git);
-		ref_git = NULL;
+		FREE_AND_NULL(ref_git);
 	}
 
 	return ref_git;
@@ -639,10 +610,9 @@ 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, strlen(alt), PATH_SEP, NULL, 0);
+	link_alt_odb_entries(alt, PATH_SEP, NULL, 0);
 
 	read_info_alternates(get_object_directory(), 0);
 }
@@ -704,213 +674,6 @@ static int has_loose_object(const unsigned char *sha1)
 	return check_and_freshen(sha1, 0);
 }
 
-static unsigned int pack_used_ctr;
-static unsigned int pack_mmap_calls;
-static unsigned int peak_pack_open_windows;
-static unsigned int pack_open_windows;
-static unsigned int pack_open_fds;
-static unsigned int pack_max_fds;
-static size_t peak_pack_mapped;
-static size_t pack_mapped;
-struct packed_git *packed_git;
-
-static struct mru packed_git_mru_storage;
-struct mru *packed_git_mru = &packed_git_mru_storage;
-
-void pack_report(void)
-{
-	fprintf(stderr,
-		"pack_report: getpagesize()            = %10" SZ_FMT "\n"
-		"pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n"
-		"pack_report: core.packedGitLimit      = %10" SZ_FMT "\n",
-		sz_fmt(getpagesize()),
-		sz_fmt(packed_git_window_size),
-		sz_fmt(packed_git_limit));
-	fprintf(stderr,
-		"pack_report: pack_used_ctr            = %10u\n"
-		"pack_report: pack_mmap_calls          = %10u\n"
-		"pack_report: pack_open_windows        = %10u / %10u\n"
-		"pack_report: pack_mapped              = "
-			"%10" SZ_FMT " / %10" SZ_FMT "\n",
-		pack_used_ctr,
-		pack_mmap_calls,
-		pack_open_windows, peak_pack_open_windows,
-		sz_fmt(pack_mapped), sz_fmt(peak_pack_mapped));
-}
-
-/*
- * Open and mmap the index file at path, perform a couple of
- * consistency checks, then record its information to p.  Return 0 on
- * success.
- */
-static int check_packed_git_idx(const char *path, struct packed_git *p)
-{
-	void *idx_map;
-	struct pack_idx_header *hdr;
-	size_t idx_size;
-	uint32_t version, nr, i, *index;
-	int fd = git_open(path);
-	struct stat st;
-
-	if (fd < 0)
-		return -1;
-	if (fstat(fd, &st)) {
-		close(fd);
-		return -1;
-	}
-	idx_size = xsize_t(st.st_size);
-	if (idx_size < 4 * 256 + 20 + 20) {
-		close(fd);
-		return error("index file %s is too small", path);
-	}
-	idx_map = xmmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0);
-	close(fd);
-
-	hdr = idx_map;
-	if (hdr->idx_signature == htonl(PACK_IDX_SIGNATURE)) {
-		version = ntohl(hdr->idx_version);
-		if (version < 2 || version > 2) {
-			munmap(idx_map, idx_size);
-			return error("index file %s is version %"PRIu32
-				     " and is not supported by this binary"
-				     " (try upgrading GIT to a newer version)",
-				     path, version);
-		}
-	} else
-		version = 1;
-
-	nr = 0;
-	index = idx_map;
-	if (version > 1)
-		index += 2;  /* skip index header */
-	for (i = 0; i < 256; i++) {
-		uint32_t n = ntohl(index[i]);
-		if (n < nr) {
-			munmap(idx_map, idx_size);
-			return error("non-monotonic index %s", path);
-		}
-		nr = n;
-	}
-
-	if (version == 1) {
-		/*
-		 * Total size:
-		 *  - 256 index entries 4 bytes each
-		 *  - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
-		 *  - 20-byte SHA1 of the packfile
-		 *  - 20-byte SHA1 file checksum
-		 */
-		if (idx_size != 4*256 + nr * 24 + 20 + 20) {
-			munmap(idx_map, idx_size);
-			return error("wrong index v1 file size in %s", path);
-		}
-	} else if (version == 2) {
-		/*
-		 * Minimum size:
-		 *  - 8 bytes of header
-		 *  - 256 index entries 4 bytes each
-		 *  - 20-byte sha1 entry * nr
-		 *  - 4-byte crc entry * nr
-		 *  - 4-byte offset entry * nr
-		 *  - 20-byte SHA1 of the packfile
-		 *  - 20-byte SHA1 file checksum
-		 * And after the 4-byte offset table might be a
-		 * variable sized table containing 8-byte entries
-		 * for offsets larger than 2^31.
-		 */
-		unsigned long min_size = 8 + 4*256 + nr*(20 + 4 + 4) + 20 + 20;
-		unsigned long max_size = min_size;
-		if (nr)
-			max_size += (nr - 1)*8;
-		if (idx_size < min_size || idx_size > max_size) {
-			munmap(idx_map, idx_size);
-			return error("wrong index v2 file size in %s", path);
-		}
-		if (idx_size != min_size &&
-		    /*
-		     * make sure we can deal with large pack offsets.
-		     * 31-bit signed offset won't be enough, neither
-		     * 32-bit unsigned one will be.
-		     */
-		    (sizeof(off_t) <= 4)) {
-			munmap(idx_map, idx_size);
-			return error("pack too large for current definition of off_t in %s", path);
-		}
-	}
-
-	p->index_version = version;
-	p->index_data = idx_map;
-	p->index_size = idx_size;
-	p->num_objects = nr;
-	return 0;
-}
-
-int open_pack_index(struct packed_git *p)
-{
-	char *idx_name;
-	size_t len;
-	int ret;
-
-	if (p->index_data)
-		return 0;
-
-	if (!strip_suffix(p->pack_name, ".pack", &len))
-		die("BUG: pack_name does not end in .pack");
-	idx_name = xstrfmt("%.*s.idx", (int)len, p->pack_name);
-	ret = check_packed_git_idx(idx_name, p);
-	free(idx_name);
-	return ret;
-}
-
-static void scan_windows(struct packed_git *p,
-	struct packed_git **lru_p,
-	struct pack_window **lru_w,
-	struct pack_window **lru_l)
-{
-	struct pack_window *w, *w_l;
-
-	for (w_l = NULL, w = p->windows; w; w = w->next) {
-		if (!w->inuse_cnt) {
-			if (!*lru_w || w->last_used < (*lru_w)->last_used) {
-				*lru_p = p;
-				*lru_w = w;
-				*lru_l = w_l;
-			}
-		}
-		w_l = w;
-	}
-}
-
-static int unuse_one_window(struct packed_git *current)
-{
-	struct packed_git *p, *lru_p = NULL;
-	struct pack_window *lru_w = NULL, *lru_l = NULL;
-
-	if (current)
-		scan_windows(current, &lru_p, &lru_w, &lru_l);
-	for (p = packed_git; p; p = p->next)
-		scan_windows(p, &lru_p, &lru_w, &lru_l);
-	if (lru_p) {
-		munmap(lru_w->base, lru_w->len);
-		pack_mapped -= lru_w->len;
-		if (lru_l)
-			lru_l->next = lru_w->next;
-		else
-			lru_p->windows = lru_w->next;
-		free(lru_w);
-		pack_open_windows--;
-		return 1;
-	}
-	return 0;
-}
-
-void release_pack_memory(size_t need)
-{
-	size_t cur = pack_mapped;
-	while (need >= (cur - pack_mapped) && unuse_one_window(NULL))
-		; /* nothing */
-}
-
 static void mmap_limit_check(size_t length)
 {
 	static size_t limit = 0;
@@ -949,681 +712,6 @@ void *xmmap(void *start, size_t length,
 	return ret;
 }
 
-void close_pack_windows(struct packed_git *p)
-{
-	while (p->windows) {
-		struct pack_window *w = p->windows;
-
-		if (w->inuse_cnt)
-			die("pack '%s' still has open windows to it",
-			    p->pack_name);
-		munmap(w->base, w->len);
-		pack_mapped -= w->len;
-		pack_open_windows--;
-		p->windows = w->next;
-		free(w);
-	}
-}
-
-static int close_pack_fd(struct packed_git *p)
-{
-	if (p->pack_fd < 0)
-		return 0;
-
-	close(p->pack_fd);
-	pack_open_fds--;
-	p->pack_fd = -1;
-
-	return 1;
-}
-
-static void close_pack(struct packed_git *p)
-{
-	close_pack_windows(p);
-	close_pack_fd(p);
-	close_pack_index(p);
-}
-
-void close_all_packs(void)
-{
-	struct packed_git *p;
-
-	for (p = packed_git; p; p = p->next)
-		if (p->do_not_close)
-			die("BUG: want to close pack marked 'do-not-close'");
-		else
-			close_pack(p);
-}
-
-
-/*
- * The LRU pack is the one with the oldest MRU window, preferring packs
- * with no used windows, or the oldest mtime if it has no windows allocated.
- */
-static void find_lru_pack(struct packed_git *p, struct packed_git **lru_p, struct pack_window **mru_w, int *accept_windows_inuse)
-{
-	struct pack_window *w, *this_mru_w;
-	int has_windows_inuse = 0;
-
-	/*
-	 * Reject this pack if it has windows and the previously selected
-	 * one does not.  If this pack does not have windows, reject
-	 * it if the pack file is newer than the previously selected one.
-	 */
-	if (*lru_p && !*mru_w && (p->windows || p->mtime > (*lru_p)->mtime))
-		return;
-
-	for (w = this_mru_w = p->windows; w; w = w->next) {
-		/*
-		 * Reject this pack if any of its windows are in use,
-		 * but the previously selected pack did not have any
-		 * inuse windows.  Otherwise, record that this pack
-		 * has windows in use.
-		 */
-		if (w->inuse_cnt) {
-			if (*accept_windows_inuse)
-				has_windows_inuse = 1;
-			else
-				return;
-		}
-
-		if (w->last_used > this_mru_w->last_used)
-			this_mru_w = w;
-
-		/*
-		 * Reject this pack if it has windows that have been
-		 * used more recently than the previously selected pack.
-		 * If the previously selected pack had windows inuse and
-		 * we have not encountered a window in this pack that is
-		 * inuse, skip this check since we prefer a pack with no
-		 * inuse windows to one that has inuse windows.
-		 */
-		if (*mru_w && *accept_windows_inuse == has_windows_inuse &&
-		    this_mru_w->last_used > (*mru_w)->last_used)
-			return;
-	}
-
-	/*
-	 * Select this pack.
-	 */
-	*mru_w = this_mru_w;
-	*lru_p = p;
-	*accept_windows_inuse = has_windows_inuse;
-}
-
-static int close_one_pack(void)
-{
-	struct packed_git *p, *lru_p = NULL;
-	struct pack_window *mru_w = NULL;
-	int accept_windows_inuse = 1;
-
-	for (p = packed_git; p; p = p->next) {
-		if (p->pack_fd == -1)
-			continue;
-		find_lru_pack(p, &lru_p, &mru_w, &accept_windows_inuse);
-	}
-
-	if (lru_p)
-		return close_pack_fd(lru_p);
-
-	return 0;
-}
-
-void unuse_pack(struct pack_window **w_cursor)
-{
-	struct pack_window *w = *w_cursor;
-	if (w) {
-		w->inuse_cnt--;
-		*w_cursor = NULL;
-	}
-}
-
-void close_pack_index(struct packed_git *p)
-{
-	if (p->index_data) {
-		munmap((void *)p->index_data, p->index_size);
-		p->index_data = NULL;
-	}
-}
-
-static unsigned int get_max_fd_limit(void)
-{
-#ifdef RLIMIT_NOFILE
-	{
-		struct rlimit lim;
-
-		if (!getrlimit(RLIMIT_NOFILE, &lim))
-			return lim.rlim_cur;
-	}
-#endif
-
-#ifdef _SC_OPEN_MAX
-	{
-		long open_max = sysconf(_SC_OPEN_MAX);
-		if (0 < open_max)
-			return open_max;
-		/*
-		 * Otherwise, we got -1 for one of the two
-		 * reasons:
-		 *
-		 * (1) sysconf() did not understand _SC_OPEN_MAX
-		 *     and signaled an error with -1; or
-		 * (2) sysconf() said there is no limit.
-		 *
-		 * We _could_ clear errno before calling sysconf() to
-		 * tell these two cases apart and return a huge number
-		 * in the latter case to let the caller cap it to a
-		 * value that is not so selfish, but letting the
-		 * fallback OPEN_MAX codepath take care of these cases
-		 * is a lot simpler.
-		 */
-	}
-#endif
-
-#ifdef OPEN_MAX
-	return OPEN_MAX;
-#else
-	return 1; /* see the caller ;-) */
-#endif
-}
-
-/*
- * Do not call this directly as this leaks p->pack_fd on error return;
- * call open_packed_git() instead.
- */
-static int open_packed_git_1(struct packed_git *p)
-{
-	struct stat st;
-	struct pack_header hdr;
-	unsigned char sha1[20];
-	unsigned char *idx_sha1;
-	long fd_flag;
-
-	if (!p->index_data && open_pack_index(p))
-		return error("packfile %s index unavailable", p->pack_name);
-
-	if (!pack_max_fds) {
-		unsigned int max_fds = get_max_fd_limit();
-
-		/* Save 3 for stdin/stdout/stderr, 22 for work */
-		if (25 < max_fds)
-			pack_max_fds = max_fds - 25;
-		else
-			pack_max_fds = 1;
-	}
-
-	while (pack_max_fds <= pack_open_fds && close_one_pack())
-		; /* nothing */
-
-	p->pack_fd = git_open(p->pack_name);
-	if (p->pack_fd < 0 || fstat(p->pack_fd, &st))
-		return -1;
-	pack_open_fds++;
-
-	/* If we created the struct before we had the pack we lack size. */
-	if (!p->pack_size) {
-		if (!S_ISREG(st.st_mode))
-			return error("packfile %s not a regular file", p->pack_name);
-		p->pack_size = st.st_size;
-	} else if (p->pack_size != st.st_size)
-		return error("packfile %s size changed", p->pack_name);
-
-	/* We leave these file descriptors open with sliding mmap;
-	 * there is no point keeping them open across exec(), though.
-	 */
-	fd_flag = fcntl(p->pack_fd, F_GETFD, 0);
-	if (fd_flag < 0)
-		return error("cannot determine file descriptor flags");
-	fd_flag |= FD_CLOEXEC;
-	if (fcntl(p->pack_fd, F_SETFD, fd_flag) == -1)
-		return error("cannot set FD_CLOEXEC");
-
-	/* Verify we recognize this pack file format. */
-	if (read_in_full(p->pack_fd, &hdr, sizeof(hdr)) != sizeof(hdr))
-		return error("file %s is far too short to be a packfile", p->pack_name);
-	if (hdr.hdr_signature != htonl(PACK_SIGNATURE))
-		return error("file %s is not a GIT packfile", p->pack_name);
-	if (!pack_version_ok(hdr.hdr_version))
-		return error("packfile %s is version %"PRIu32" and not"
-			" supported (try upgrading GIT to a newer version)",
-			p->pack_name, ntohl(hdr.hdr_version));
-
-	/* Verify the pack matches its index. */
-	if (p->num_objects != ntohl(hdr.hdr_entries))
-		return error("packfile %s claims to have %"PRIu32" objects"
-			     " while index indicates %"PRIu32" objects",
-			     p->pack_name, ntohl(hdr.hdr_entries),
-			     p->num_objects);
-	if (lseek(p->pack_fd, p->pack_size - sizeof(sha1), SEEK_SET) == -1)
-		return error("end of packfile %s is unavailable", p->pack_name);
-	if (read_in_full(p->pack_fd, sha1, sizeof(sha1)) != sizeof(sha1))
-		return error("packfile %s signature is unavailable", p->pack_name);
-	idx_sha1 = ((unsigned char *)p->index_data) + p->index_size - 40;
-	if (hashcmp(sha1, idx_sha1))
-		return error("packfile %s does not match index", p->pack_name);
-	return 0;
-}
-
-static int open_packed_git(struct packed_git *p)
-{
-	if (!open_packed_git_1(p))
-		return 0;
-	close_pack_fd(p);
-	return -1;
-}
-
-static int in_window(struct pack_window *win, off_t offset)
-{
-	/* We must promise at least 20 bytes (one hash) after the
-	 * offset is available from this window, otherwise the offset
-	 * is not actually in this window and a different window (which
-	 * has that one hash excess) must be used.  This is to support
-	 * the object header and delta base parsing routines below.
-	 */
-	off_t win_off = win->offset;
-	return win_off <= offset
-		&& (offset + 20) <= (win_off + win->len);
-}
-
-unsigned char *use_pack(struct packed_git *p,
-		struct pack_window **w_cursor,
-		off_t offset,
-		unsigned long *left)
-{
-	struct pack_window *win = *w_cursor;
-
-	/* Since packfiles end in a hash of their content and it's
-	 * pointless to ask for an offset into the middle of that
-	 * hash, and the in_window function above wouldn't match
-	 * don't allow an offset too close to the end of the file.
-	 */
-	if (!p->pack_size && p->pack_fd == -1 && open_packed_git(p))
-		die("packfile %s cannot be accessed", p->pack_name);
-	if (offset > (p->pack_size - 20))
-		die("offset beyond end of packfile (truncated pack?)");
-	if (offset < 0)
-		die(_("offset before end of packfile (broken .idx?)"));
-
-	if (!win || !in_window(win, offset)) {
-		if (win)
-			win->inuse_cnt--;
-		for (win = p->windows; win; win = win->next) {
-			if (in_window(win, offset))
-				break;
-		}
-		if (!win) {
-			size_t window_align = packed_git_window_size / 2;
-			off_t len;
-
-			if (p->pack_fd == -1 && open_packed_git(p))
-				die("packfile %s cannot be accessed", p->pack_name);
-
-			win = xcalloc(1, sizeof(*win));
-			win->offset = (offset / window_align) * window_align;
-			len = p->pack_size - win->offset;
-			if (len > packed_git_window_size)
-				len = packed_git_window_size;
-			win->len = (size_t)len;
-			pack_mapped += win->len;
-			while (packed_git_limit < pack_mapped
-				&& unuse_one_window(p))
-				; /* nothing */
-			win->base = xmmap(NULL, win->len,
-				PROT_READ, MAP_PRIVATE,
-				p->pack_fd, win->offset);
-			if (win->base == MAP_FAILED)
-				die_errno("packfile %s cannot be mapped",
-					  p->pack_name);
-			if (!win->offset && win->len == p->pack_size
-				&& !p->do_not_close)
-				close_pack_fd(p);
-			pack_mmap_calls++;
-			pack_open_windows++;
-			if (pack_mapped > peak_pack_mapped)
-				peak_pack_mapped = pack_mapped;
-			if (pack_open_windows > peak_pack_open_windows)
-				peak_pack_open_windows = pack_open_windows;
-			win->next = p->windows;
-			p->windows = win;
-		}
-	}
-	if (win != *w_cursor) {
-		win->last_used = pack_used_ctr++;
-		win->inuse_cnt++;
-		*w_cursor = win;
-	}
-	offset -= win->offset;
-	if (left)
-		*left = win->len - xsize_t(offset);
-	return win->base + offset;
-}
-
-static struct packed_git *alloc_packed_git(int extra)
-{
-	struct packed_git *p = xmalloc(st_add(sizeof(*p), extra));
-	memset(p, 0, sizeof(*p));
-	p->pack_fd = -1;
-	return p;
-}
-
-static void try_to_free_pack_memory(size_t size)
-{
-	release_pack_memory(size);
-}
-
-struct packed_git *add_packed_git(const char *path, size_t path_len, int local)
-{
-	static int have_set_try_to_free_routine;
-	struct stat st;
-	size_t alloc;
-	struct packed_git *p;
-
-	if (!have_set_try_to_free_routine) {
-		have_set_try_to_free_routine = 1;
-		set_try_to_free_routine(try_to_free_pack_memory);
-	}
-
-	/*
-	 * Make sure a corresponding .pack file exists and that
-	 * the index looks sane.
-	 */
-	if (!strip_suffix_mem(path, &path_len, ".idx"))
-		return NULL;
-
-	/*
-	 * ".pack" is long enough to hold any suffix we're adding (and
-	 * the use xsnprintf double-checks that)
-	 */
-	alloc = st_add3(path_len, strlen(".pack"), 1);
-	p = alloc_packed_git(alloc);
-	memcpy(p->pack_name, path, path_len);
-
-	xsnprintf(p->pack_name + path_len, alloc - path_len, ".keep");
-	if (!access(p->pack_name, F_OK))
-		p->pack_keep = 1;
-
-	xsnprintf(p->pack_name + path_len, alloc - path_len, ".pack");
-	if (stat(p->pack_name, &st) || !S_ISREG(st.st_mode)) {
-		free(p);
-		return NULL;
-	}
-
-	/* ok, it looks sane as far as we can check without
-	 * actually mapping the pack file.
-	 */
-	p->pack_size = st.st_size;
-	p->pack_local = local;
-	p->mtime = st.st_mtime;
-	if (path_len < 40 || get_sha1_hex(path + path_len - 40, p->sha1))
-		hashclr(p->sha1);
-	return p;
-}
-
-struct packed_git *parse_pack_index(unsigned char *sha1, const char *idx_path)
-{
-	const char *path = sha1_pack_name(sha1);
-	size_t alloc = st_add(strlen(path), 1);
-	struct packed_git *p = alloc_packed_git(alloc);
-
-	memcpy(p->pack_name, path, alloc); /* includes NUL */
-	hashcpy(p->sha1, sha1);
-	if (check_packed_git_idx(idx_path, p)) {
-		free(p);
-		return NULL;
-	}
-
-	return p;
-}
-
-void install_packed_git(struct packed_git *pack)
-{
-	if (pack->pack_fd != -1)
-		pack_open_fds++;
-
-	pack->next = packed_git;
-	packed_git = pack;
-}
-
-void (*report_garbage)(unsigned seen_bits, const char *path);
-
-static void report_helper(const struct string_list *list,
-			  int seen_bits, int first, int last)
-{
-	if (seen_bits == (PACKDIR_FILE_PACK|PACKDIR_FILE_IDX))
-		return;
-
-	for (; first < last; first++)
-		report_garbage(seen_bits, list->items[first].string);
-}
-
-static void report_pack_garbage(struct string_list *list)
-{
-	int i, baselen = -1, first = 0, seen_bits = 0;
-
-	if (!report_garbage)
-		return;
-
-	string_list_sort(list);
-
-	for (i = 0; i < list->nr; i++) {
-		const char *path = list->items[i].string;
-		if (baselen != -1 &&
-		    strncmp(path, list->items[first].string, baselen)) {
-			report_helper(list, seen_bits, first, i);
-			baselen = -1;
-			seen_bits = 0;
-		}
-		if (baselen == -1) {
-			const char *dot = strrchr(path, '.');
-			if (!dot) {
-				report_garbage(PACKDIR_FILE_GARBAGE, path);
-				continue;
-			}
-			baselen = dot - path + 1;
-			first = i;
-		}
-		if (!strcmp(path + baselen, "pack"))
-			seen_bits |= 1;
-		else if (!strcmp(path + baselen, "idx"))
-			seen_bits |= 2;
-	}
-	report_helper(list, seen_bits, first, list->nr);
-}
-
-static void prepare_packed_git_one(char *objdir, int local)
-{
-	struct strbuf path = STRBUF_INIT;
-	size_t dirnamelen;
-	DIR *dir;
-	struct dirent *de;
-	struct string_list garbage = STRING_LIST_INIT_DUP;
-
-	strbuf_addstr(&path, objdir);
-	strbuf_addstr(&path, "/pack");
-	dir = opendir(path.buf);
-	if (!dir) {
-		if (errno != ENOENT)
-			error_errno("unable to open object pack directory: %s",
-				    path.buf);
-		strbuf_release(&path);
-		return;
-	}
-	strbuf_addch(&path, '/');
-	dirnamelen = path.len;
-	while ((de = readdir(dir)) != NULL) {
-		struct packed_git *p;
-		size_t base_len;
-
-		if (is_dot_or_dotdot(de->d_name))
-			continue;
-
-		strbuf_setlen(&path, dirnamelen);
-		strbuf_addstr(&path, de->d_name);
-
-		base_len = path.len;
-		if (strip_suffix_mem(path.buf, &base_len, ".idx")) {
-			/* Don't reopen a pack we already have. */
-			for (p = packed_git; p; p = p->next) {
-				size_t len;
-				if (strip_suffix(p->pack_name, ".pack", &len) &&
-				    len == base_len &&
-				    !memcmp(p->pack_name, path.buf, len))
-					break;
-			}
-			if (p == NULL &&
-			    /*
-			     * See if it really is a valid .idx file with
-			     * corresponding .pack file that we can map.
-			     */
-			    (p = add_packed_git(path.buf, path.len, local)) != NULL)
-				install_packed_git(p);
-		}
-
-		if (!report_garbage)
-			continue;
-
-		if (ends_with(de->d_name, ".idx") ||
-		    ends_with(de->d_name, ".pack") ||
-		    ends_with(de->d_name, ".bitmap") ||
-		    ends_with(de->d_name, ".keep"))
-			string_list_append(&garbage, path.buf);
-		else
-			report_garbage(PACKDIR_FILE_GARBAGE, path.buf);
-	}
-	closedir(dir);
-	report_pack_garbage(&garbage);
-	string_list_clear(&garbage, 0);
-	strbuf_release(&path);
-}
-
-static int approximate_object_count_valid;
-
-/*
- * Give a fast, rough count of the number of objects in the repository. This
- * ignores loose objects completely. If you have a lot of them, then either
- * you should repack because your performance will be awful, or they are
- * all unreachable objects about to be pruned, in which case they're not really
- * interesting as a measure of repo size in the first place.
- */
-unsigned long approximate_object_count(void)
-{
-	static unsigned long count;
-	if (!approximate_object_count_valid) {
-		struct packed_git *p;
-
-		prepare_packed_git();
-		count = 0;
-		for (p = packed_git; p; p = p->next) {
-			if (open_pack_index(p))
-				continue;
-			count += p->num_objects;
-		}
-	}
-	return count;
-}
-
-static void *get_next_packed_git(const void *p)
-{
-	return ((const struct packed_git *)p)->next;
-}
-
-static void set_next_packed_git(void *p, void *next)
-{
-	((struct packed_git *)p)->next = next;
-}
-
-static int sort_pack(const void *a_, const void *b_)
-{
-	const struct packed_git *a = a_;
-	const struct packed_git *b = b_;
-	int st;
-
-	/*
-	 * Local packs tend to contain objects specific to our
-	 * variant of the project than remote ones.  In addition,
-	 * remote ones could be on a network mounted filesystem.
-	 * Favor local ones for these reasons.
-	 */
-	st = a->pack_local - b->pack_local;
-	if (st)
-		return -st;
-
-	/*
-	 * Younger packs tend to contain more recent objects,
-	 * and more recent objects tend to get accessed more
-	 * often.
-	 */
-	if (a->mtime < b->mtime)
-		return 1;
-	else if (a->mtime == b->mtime)
-		return 0;
-	return -1;
-}
-
-static void rearrange_packed_git(void)
-{
-	packed_git = llist_mergesort(packed_git, get_next_packed_git,
-				     set_next_packed_git, sort_pack);
-}
-
-static void prepare_packed_git_mru(void)
-{
-	struct packed_git *p;
-
-	mru_clear(packed_git_mru);
-	for (p = packed_git; p; p = p->next)
-		mru_append(packed_git_mru, p);
-}
-
-static int prepare_packed_git_run_once = 0;
-void prepare_packed_git(void)
-{
-	struct alternate_object_database *alt;
-
-	if (prepare_packed_git_run_once)
-		return;
-	prepare_packed_git_one(get_object_directory(), 1);
-	prepare_alt_odb();
-	for (alt = alt_odb_list; alt; alt = alt->next)
-		prepare_packed_git_one(alt->path, 0);
-	rearrange_packed_git();
-	prepare_packed_git_mru();
-	prepare_packed_git_run_once = 1;
-}
-
-void reprepare_packed_git(void)
-{
-	approximate_object_count_valid = 0;
-	prepare_packed_git_run_once = 0;
-	prepare_packed_git();
-}
-
-static void mark_bad_packed_object(struct packed_git *p,
-				   const unsigned char *sha1)
-{
-	unsigned i;
-	for (i = 0; i < p->num_bad_objects; i++)
-		if (!hashcmp(sha1, p->bad_object_sha1 + GIT_SHA1_RAWSZ * i))
-			return;
-	p->bad_object_sha1 = xrealloc(p->bad_object_sha1,
-				      st_mult(GIT_MAX_RAWSZ,
-					      st_add(p->num_bad_objects, 1)));
-	hashcpy(p->bad_object_sha1 + GIT_SHA1_RAWSZ * p->num_bad_objects, sha1);
-	p->num_bad_objects++;
-}
-
-static const struct packed_git *has_packed_and_bad(const unsigned char *sha1)
-{
-	struct packed_git *p;
-	unsigned i;
-
-	for (p = packed_git; p; p = p->next)
-		for (i = 0; i < p->num_bad_objects; i++)
-			if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i))
-				return p;
-	return NULL;
-}
-
 /*
  * With an in-core object data in "map", rehash it to make sure the
  * object name actually matches "sha1" to detect object corruption.
@@ -1684,14 +772,14 @@ int git_open_cloexec(const char *name, int flags)
 		fd = open(name, flags | o_cloexec);
 	}
 
-#if defined(F_GETFL) && defined(F_SETFL) && defined(FD_CLOEXEC)
+#if defined(F_GETFD) && defined(F_SETFD) && defined(FD_CLOEXEC)
 	{
 		static int fd_cloexec = FD_CLOEXEC;
 
 		if (!o_cloexec && 0 <= fd && fd_cloexec) {
 			/* Opened w/o O_CLOEXEC?  try with fcntl(2) to add it */
-			int flags = fcntl(fd, F_GETFL);
-			if (fcntl(fd, F_SETFL, flags | fd_cloexec))
+			int flags = fcntl(fd, F_GETFD);
+			if (fcntl(fd, F_SETFD, flags | fd_cloexec))
 				fd_cloexec = 0;
 		}
 	}
@@ -1794,31 +882,6 @@ void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
 	return map_sha1_file_1(NULL, sha1, size);
 }
 
-unsigned long unpack_object_header_buffer(const unsigned char *buf,
-		unsigned long len, enum object_type *type, unsigned long *sizep)
-{
-	unsigned shift;
-	unsigned long size, c;
-	unsigned long used = 0;
-
-	c = buf[used++];
-	*type = (c >> 4) & 7;
-	size = c & 15;
-	shift = 4;
-	while (c & 0x80) {
-		if (len <= used || bitsizeof(long) <= shift) {
-			error("bad object header");
-			size = used = 0;
-			break;
-		}
-		c = buf[used++];
-		size += (c & 0x7f) << shift;
-		shift += 7;
-	}
-	*sizep = size;
-	return used;
-}
-
 static int unpack_sha1_short_header(git_zstream *stream,
 				    unsigned char *map, unsigned long mapsize,
 				    void *buffer, unsigned long bufsiz)
@@ -1964,7 +1027,7 @@ static int parse_sha1_header_extended(const char *hdr, struct object_info *oi,
 	 * we're obtaining the type using '--allow-unknown-type'
 	 * option.
 	 */
-	if ((flags & LOOKUP_UNKNOWN_OBJECT) && (type < 0))
+	if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE) && (type < 0))
 		type = 0;
 	else if (type < 0)
 		die("invalid object type");
@@ -2002,897 +1065,7 @@ int parse_sha1_header(const char *hdr, unsigned long *sizep)
 	struct object_info oi = OBJECT_INFO_INIT;
 
 	oi.sizep = sizep;
-	return parse_sha1_header_extended(hdr, &oi, LOOKUP_REPLACE_OBJECT);
-}
-
-static void *unpack_sha1_file(void *map, unsigned long mapsize, enum object_type *type, unsigned long *size, const unsigned char *sha1)
-{
-	int ret;
-	git_zstream stream;
-	char hdr[8192];
-
-	ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr));
-	if (ret < Z_OK || (*type = parse_sha1_header(hdr, size)) < 0)
-		return NULL;
-
-	return unpack_sha1_rest(&stream, hdr, *size, sha1);
-}
-
-unsigned long get_size_from_delta(struct packed_git *p,
-				  struct pack_window **w_curs,
-			          off_t curpos)
-{
-	const unsigned char *data;
-	unsigned char delta_head[20], *in;
-	git_zstream stream;
-	int st;
-
-	memset(&stream, 0, sizeof(stream));
-	stream.next_out = delta_head;
-	stream.avail_out = sizeof(delta_head);
-
-	git_inflate_init(&stream);
-	do {
-		in = use_pack(p, w_curs, curpos, &stream.avail_in);
-		stream.next_in = in;
-		st = git_inflate(&stream, Z_FINISH);
-		curpos += stream.next_in - in;
-	} while ((st == Z_OK || st == Z_BUF_ERROR) &&
-		 stream.total_out < sizeof(delta_head));
-	git_inflate_end(&stream);
-	if ((st != Z_STREAM_END) && stream.total_out != sizeof(delta_head)) {
-		error("delta data unpack-initial failed");
-		return 0;
-	}
-
-	/* Examine the initial part of the delta to figure out
-	 * the result size.
-	 */
-	data = delta_head;
-
-	/* ignore base size */
-	get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
-
-	/* Read the result size */
-	return get_delta_hdr_size(&data, delta_head+sizeof(delta_head));
-}
-
-static off_t get_delta_base(struct packed_git *p,
-				    struct pack_window **w_curs,
-				    off_t *curpos,
-				    enum object_type type,
-				    off_t delta_obj_offset)
-{
-	unsigned char *base_info = use_pack(p, w_curs, *curpos, NULL);
-	off_t base_offset;
-
-	/* use_pack() assured us we have [base_info, base_info + 20)
-	 * as a range that we can look at without walking off the
-	 * end of the mapped window.  Its actually the hash size
-	 * that is assured.  An OFS_DELTA longer than the hash size
-	 * is stupid, as then a REF_DELTA would be smaller to store.
-	 */
-	if (type == OBJ_OFS_DELTA) {
-		unsigned used = 0;
-		unsigned char c = base_info[used++];
-		base_offset = c & 127;
-		while (c & 128) {
-			base_offset += 1;
-			if (!base_offset || MSB(base_offset, 7))
-				return 0;  /* overflow */
-			c = base_info[used++];
-			base_offset = (base_offset << 7) + (c & 127);
-		}
-		base_offset = delta_obj_offset - base_offset;
-		if (base_offset <= 0 || base_offset >= delta_obj_offset)
-			return 0;  /* out of bound */
-		*curpos += used;
-	} else if (type == OBJ_REF_DELTA) {
-		/* The base entry _must_ be in the same pack */
-		base_offset = find_pack_entry_one(base_info, p);
-		*curpos += 20;
-	} else
-		die("I am totally screwed");
-	return base_offset;
-}
-
-/*
- * Like get_delta_base above, but we return the sha1 instead of the pack
- * offset. This means it is cheaper for REF deltas (we do not have to do
- * the final object lookup), but more expensive for OFS deltas (we
- * have to load the revidx to convert the offset back into a sha1).
- */
-static const unsigned char *get_delta_base_sha1(struct packed_git *p,
-						struct pack_window **w_curs,
-						off_t curpos,
-						enum object_type type,
-						off_t delta_obj_offset)
-{
-	if (type == OBJ_REF_DELTA) {
-		unsigned char *base = use_pack(p, w_curs, curpos, NULL);
-		return base;
-	} else if (type == OBJ_OFS_DELTA) {
-		struct revindex_entry *revidx;
-		off_t base_offset = get_delta_base(p, w_curs, &curpos,
-						   type, delta_obj_offset);
-
-		if (!base_offset)
-			return NULL;
-
-		revidx = find_pack_revindex(p, base_offset);
-		if (!revidx)
-			return NULL;
-
-		return nth_packed_object_sha1(p, revidx->nr);
-	} else
-		return NULL;
-}
-
-int unpack_object_header(struct packed_git *p,
-			 struct pack_window **w_curs,
-			 off_t *curpos,
-			 unsigned long *sizep)
-{
-	unsigned char *base;
-	unsigned long left;
-	unsigned long used;
-	enum object_type type;
-
-	/* use_pack() assures us we have [base, base + 20) available
-	 * as a range that we can look at.  (Its actually the hash
-	 * size that is assured.)  With our object header encoding
-	 * the maximum deflated object size is 2^137, which is just
-	 * insane, so we know won't exceed what we have been given.
-	 */
-	base = use_pack(p, w_curs, *curpos, &left);
-	used = unpack_object_header_buffer(base, left, &type, sizep);
-	if (!used) {
-		type = OBJ_BAD;
-	} else
-		*curpos += used;
-
-	return type;
-}
-
-static int retry_bad_packed_offset(struct packed_git *p, off_t obj_offset)
-{
-	int type;
-	struct revindex_entry *revidx;
-	const unsigned char *sha1;
-	revidx = find_pack_revindex(p, obj_offset);
-	if (!revidx)
-		return OBJ_BAD;
-	sha1 = nth_packed_object_sha1(p, revidx->nr);
-	mark_bad_packed_object(p, sha1);
-	type = sha1_object_info(sha1, NULL);
-	if (type <= OBJ_NONE)
-		return OBJ_BAD;
-	return type;
-}
-
-#define POI_STACK_PREALLOC 64
-
-static enum object_type packed_to_object_type(struct packed_git *p,
-					      off_t obj_offset,
-					      enum object_type type,
-					      struct pack_window **w_curs,
-					      off_t curpos)
-{
-	off_t small_poi_stack[POI_STACK_PREALLOC];
-	off_t *poi_stack = small_poi_stack;
-	int poi_stack_nr = 0, poi_stack_alloc = POI_STACK_PREALLOC;
-
-	while (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) {
-		off_t base_offset;
-		unsigned long size;
-		/* Push the object we're going to leave behind */
-		if (poi_stack_nr >= poi_stack_alloc && poi_stack == small_poi_stack) {
-			poi_stack_alloc = alloc_nr(poi_stack_nr);
-			ALLOC_ARRAY(poi_stack, poi_stack_alloc);
-			memcpy(poi_stack, small_poi_stack, sizeof(off_t)*poi_stack_nr);
-		} else {
-			ALLOC_GROW(poi_stack, poi_stack_nr+1, poi_stack_alloc);
-		}
-		poi_stack[poi_stack_nr++] = obj_offset;
-		/* If parsing the base offset fails, just unwind */
-		base_offset = get_delta_base(p, w_curs, &curpos, type, obj_offset);
-		if (!base_offset)
-			goto unwind;
-		curpos = obj_offset = base_offset;
-		type = unpack_object_header(p, w_curs, &curpos, &size);
-		if (type <= OBJ_NONE) {
-			/* If getting the base itself fails, we first
-			 * retry the base, otherwise unwind */
-			type = retry_bad_packed_offset(p, base_offset);
-			if (type > OBJ_NONE)
-				goto out;
-			goto unwind;
-		}
-	}
-
-	switch (type) {
-	case OBJ_BAD:
-	case OBJ_COMMIT:
-	case OBJ_TREE:
-	case OBJ_BLOB:
-	case OBJ_TAG:
-		break;
-	default:
-		error("unknown object type %i at offset %"PRIuMAX" in %s",
-		      type, (uintmax_t)obj_offset, p->pack_name);
-		type = OBJ_BAD;
-	}
-
-out:
-	if (poi_stack != small_poi_stack)
-		free(poi_stack);
-	return type;
-
-unwind:
-	while (poi_stack_nr) {
-		obj_offset = poi_stack[--poi_stack_nr];
-		type = retry_bad_packed_offset(p, obj_offset);
-		if (type > OBJ_NONE)
-			goto out;
-	}
-	type = OBJ_BAD;
-	goto out;
-}
-
-int packed_object_info(struct packed_git *p, off_t obj_offset,
-		       struct object_info *oi)
-{
-	struct pack_window *w_curs = NULL;
-	unsigned long size;
-	off_t curpos = obj_offset;
-	enum object_type type;
-
-	/*
-	 * We always get the representation type, but only convert it to
-	 * a "real" type later if the caller is interested.
-	 */
-	type = unpack_object_header(p, &w_curs, &curpos, &size);
-
-	if (oi->sizep) {
-		if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) {
-			off_t tmp_pos = curpos;
-			off_t base_offset = get_delta_base(p, &w_curs, &tmp_pos,
-							   type, obj_offset);
-			if (!base_offset) {
-				type = OBJ_BAD;
-				goto out;
-			}
-			*oi->sizep = get_size_from_delta(p, &w_curs, tmp_pos);
-			if (*oi->sizep == 0) {
-				type = OBJ_BAD;
-				goto out;
-			}
-		} else {
-			*oi->sizep = size;
-		}
-	}
-
-	if (oi->disk_sizep) {
-		struct revindex_entry *revidx = find_pack_revindex(p, obj_offset);
-		*oi->disk_sizep = revidx[1].offset - obj_offset;
-	}
-
-	if (oi->typep) {
-		*oi->typep = packed_to_object_type(p, obj_offset, type, &w_curs, curpos);
-		if (*oi->typep < 0) {
-			type = OBJ_BAD;
-			goto out;
-		}
-	}
-
-	if (oi->delta_base_sha1) {
-		if (type == OBJ_OFS_DELTA || type == OBJ_REF_DELTA) {
-			const unsigned char *base;
-
-			base = get_delta_base_sha1(p, &w_curs, curpos,
-						   type, obj_offset);
-			if (!base) {
-				type = OBJ_BAD;
-				goto out;
-			}
-
-			hashcpy(oi->delta_base_sha1, base);
-		} else
-			hashclr(oi->delta_base_sha1);
-	}
-
-out:
-	unuse_pack(&w_curs);
-	return type;
-}
-
-static void *unpack_compressed_entry(struct packed_git *p,
-				    struct pack_window **w_curs,
-				    off_t curpos,
-				    unsigned long size)
-{
-	int st;
-	git_zstream stream;
-	unsigned char *buffer, *in;
-
-	buffer = xmallocz_gently(size);
-	if (!buffer)
-		return NULL;
-	memset(&stream, 0, sizeof(stream));
-	stream.next_out = buffer;
-	stream.avail_out = size + 1;
-
-	git_inflate_init(&stream);
-	do {
-		in = use_pack(p, w_curs, curpos, &stream.avail_in);
-		stream.next_in = in;
-		st = git_inflate(&stream, Z_FINISH);
-		if (!stream.avail_out)
-			break; /* the payload is larger than it should be */
-		curpos += stream.next_in - in;
-	} while (st == Z_OK || st == Z_BUF_ERROR);
-	git_inflate_end(&stream);
-	if ((st != Z_STREAM_END) || stream.total_out != size) {
-		free(buffer);
-		return NULL;
-	}
-
-	return buffer;
-}
-
-static struct hashmap delta_base_cache;
-static size_t delta_base_cached;
-
-static LIST_HEAD(delta_base_cache_lru);
-
-struct delta_base_cache_key {
-	struct packed_git *p;
-	off_t base_offset;
-};
-
-struct delta_base_cache_entry {
-	struct hashmap hash;
-	struct delta_base_cache_key key;
-	struct list_head lru;
-	void *data;
-	unsigned long size;
-	enum object_type type;
-};
-
-static unsigned int pack_entry_hash(struct packed_git *p, off_t base_offset)
-{
-	unsigned int hash;
-
-	hash = (unsigned int)(intptr_t)p + (unsigned int)base_offset;
-	hash += (hash >> 8) + (hash >> 16);
-	return hash;
-}
-
-static struct delta_base_cache_entry *
-get_delta_base_cache_entry(struct packed_git *p, off_t base_offset)
-{
-	struct hashmap_entry entry;
-	struct delta_base_cache_key key;
-
-	if (!delta_base_cache.cmpfn)
-		return NULL;
-
-	hashmap_entry_init(&entry, pack_entry_hash(p, base_offset));
-	key.p = p;
-	key.base_offset = base_offset;
-	return hashmap_get(&delta_base_cache, &entry, &key);
-}
-
-static int delta_base_cache_key_eq(const struct delta_base_cache_key *a,
-				   const struct delta_base_cache_key *b)
-{
-	return a->p == b->p && a->base_offset == b->base_offset;
-}
-
-static int delta_base_cache_hash_cmp(const void *va, const void *vb,
-				     const void *vkey)
-{
-	const struct delta_base_cache_entry *a = va, *b = vb;
-	const struct delta_base_cache_key *key = vkey;
-	if (key)
-		return !delta_base_cache_key_eq(&a->key, key);
-	else
-		return !delta_base_cache_key_eq(&a->key, &b->key);
-}
-
-static int in_delta_base_cache(struct packed_git *p, off_t base_offset)
-{
-	return !!get_delta_base_cache_entry(p, base_offset);
-}
-
-/*
- * Remove the entry from the cache, but do _not_ free the associated
- * entry data. The caller takes ownership of the "data" buffer, and
- * should copy out any fields it wants before detaching.
- */
-static void detach_delta_base_cache_entry(struct delta_base_cache_entry *ent)
-{
-	hashmap_remove(&delta_base_cache, ent, &ent->key);
-	list_del(&ent->lru);
-	delta_base_cached -= ent->size;
-	free(ent);
-}
-
-static void *cache_or_unpack_entry(struct packed_git *p, off_t base_offset,
-	unsigned long *base_size, enum object_type *type)
-{
-	struct delta_base_cache_entry *ent;
-
-	ent = get_delta_base_cache_entry(p, base_offset);
-	if (!ent)
-		return unpack_entry(p, base_offset, type, base_size);
-
-	*type = ent->type;
-	*base_size = ent->size;
-	return xmemdupz(ent->data, ent->size);
-}
-
-static inline void release_delta_base_cache(struct delta_base_cache_entry *ent)
-{
-	free(ent->data);
-	detach_delta_base_cache_entry(ent);
-}
-
-void clear_delta_base_cache(void)
-{
-	struct list_head *lru, *tmp;
-	list_for_each_safe(lru, tmp, &delta_base_cache_lru) {
-		struct delta_base_cache_entry *entry =
-			list_entry(lru, struct delta_base_cache_entry, lru);
-		release_delta_base_cache(entry);
-	}
-}
-
-static void add_delta_base_cache(struct packed_git *p, off_t base_offset,
-	void *base, unsigned long base_size, enum object_type type)
-{
-	struct delta_base_cache_entry *ent = xmalloc(sizeof(*ent));
-	struct list_head *lru, *tmp;
-
-	delta_base_cached += base_size;
-
-	list_for_each_safe(lru, tmp, &delta_base_cache_lru) {
-		struct delta_base_cache_entry *f =
-			list_entry(lru, struct delta_base_cache_entry, lru);
-		if (delta_base_cached <= delta_base_cache_limit)
-			break;
-		release_delta_base_cache(f);
-	}
-
-	ent->key.p = p;
-	ent->key.base_offset = base_offset;
-	ent->type = type;
-	ent->data = base;
-	ent->size = base_size;
-	list_add_tail(&ent->lru, &delta_base_cache_lru);
-
-	if (!delta_base_cache.cmpfn)
-		hashmap_init(&delta_base_cache, delta_base_cache_hash_cmp, 0);
-	hashmap_entry_init(ent, pack_entry_hash(p, base_offset));
-	hashmap_add(&delta_base_cache, ent);
-}
-
-static void *read_object(const unsigned char *sha1, enum object_type *type,
-			 unsigned long *size);
-
-static void write_pack_access_log(struct packed_git *p, off_t obj_offset)
-{
-	static struct trace_key pack_access = TRACE_KEY_INIT(PACK_ACCESS);
-	trace_printf_key(&pack_access, "%s %"PRIuMAX"\n",
-			 p->pack_name, (uintmax_t)obj_offset);
-}
-
-int do_check_packed_object_crc;
-
-#define UNPACK_ENTRY_STACK_PREALLOC 64
-struct unpack_entry_stack_ent {
-	off_t obj_offset;
-	off_t curpos;
-	unsigned long size;
-};
-
-void *unpack_entry(struct packed_git *p, off_t obj_offset,
-		   enum object_type *final_type, unsigned long *final_size)
-{
-	struct pack_window *w_curs = NULL;
-	off_t curpos = obj_offset;
-	void *data = NULL;
-	unsigned long size;
-	enum object_type type;
-	struct unpack_entry_stack_ent small_delta_stack[UNPACK_ENTRY_STACK_PREALLOC];
-	struct unpack_entry_stack_ent *delta_stack = small_delta_stack;
-	int delta_stack_nr = 0, delta_stack_alloc = UNPACK_ENTRY_STACK_PREALLOC;
-	int base_from_cache = 0;
-
-	write_pack_access_log(p, obj_offset);
-
-	/* PHASE 1: drill down to the innermost base object */
-	for (;;) {
-		off_t base_offset;
-		int i;
-		struct delta_base_cache_entry *ent;
-
-		ent = get_delta_base_cache_entry(p, curpos);
-		if (ent) {
-			type = ent->type;
-			data = ent->data;
-			size = ent->size;
-			detach_delta_base_cache_entry(ent);
-			base_from_cache = 1;
-			break;
-		}
-
-		if (do_check_packed_object_crc && p->index_version > 1) {
-			struct revindex_entry *revidx = find_pack_revindex(p, obj_offset);
-			off_t len = revidx[1].offset - obj_offset;
-			if (check_pack_crc(p, &w_curs, obj_offset, len, revidx->nr)) {
-				const unsigned char *sha1 =
-					nth_packed_object_sha1(p, revidx->nr);
-				error("bad packed object CRC for %s",
-				      sha1_to_hex(sha1));
-				mark_bad_packed_object(p, sha1);
-				unuse_pack(&w_curs);
-				return NULL;
-			}
-		}
-
-		type = unpack_object_header(p, &w_curs, &curpos, &size);
-		if (type != OBJ_OFS_DELTA && type != OBJ_REF_DELTA)
-			break;
-
-		base_offset = get_delta_base(p, &w_curs, &curpos, type, obj_offset);
-		if (!base_offset) {
-			error("failed to validate delta base reference "
-			      "at offset %"PRIuMAX" from %s",
-			      (uintmax_t)curpos, p->pack_name);
-			/* bail to phase 2, in hopes of recovery */
-			data = NULL;
-			break;
-		}
-
-		/* push object, proceed to base */
-		if (delta_stack_nr >= delta_stack_alloc
-		    && delta_stack == small_delta_stack) {
-			delta_stack_alloc = alloc_nr(delta_stack_nr);
-			ALLOC_ARRAY(delta_stack, delta_stack_alloc);
-			memcpy(delta_stack, small_delta_stack,
-			       sizeof(*delta_stack)*delta_stack_nr);
-		} else {
-			ALLOC_GROW(delta_stack, delta_stack_nr+1, delta_stack_alloc);
-		}
-		i = delta_stack_nr++;
-		delta_stack[i].obj_offset = obj_offset;
-		delta_stack[i].curpos = curpos;
-		delta_stack[i].size = size;
-
-		curpos = obj_offset = base_offset;
-	}
-
-	/* PHASE 2: handle the base */
-	switch (type) {
-	case OBJ_OFS_DELTA:
-	case OBJ_REF_DELTA:
-		if (data)
-			die("BUG: unpack_entry: left loop at a valid delta");
-		break;
-	case OBJ_COMMIT:
-	case OBJ_TREE:
-	case OBJ_BLOB:
-	case OBJ_TAG:
-		if (!base_from_cache)
-			data = unpack_compressed_entry(p, &w_curs, curpos, size);
-		break;
-	default:
-		data = NULL;
-		error("unknown object type %i at offset %"PRIuMAX" in %s",
-		      type, (uintmax_t)obj_offset, p->pack_name);
-	}
-
-	/* PHASE 3: apply deltas in order */
-
-	/* invariants:
-	 *   'data' holds the base data, or NULL if there was corruption
-	 */
-	while (delta_stack_nr) {
-		void *delta_data;
-		void *base = data;
-		void *external_base = NULL;
-		unsigned long delta_size, base_size = size;
-		int i;
-
-		data = NULL;
-
-		if (base)
-			add_delta_base_cache(p, obj_offset, base, base_size, type);
-
-		if (!base) {
-			/*
-			 * We're probably in deep shit, but let's try to fetch
-			 * the required base anyway from another pack or loose.
-			 * This is costly but should happen only in the presence
-			 * of a corrupted pack, and is better than failing outright.
-			 */
-			struct revindex_entry *revidx;
-			const unsigned char *base_sha1;
-			revidx = find_pack_revindex(p, obj_offset);
-			if (revidx) {
-				base_sha1 = nth_packed_object_sha1(p, revidx->nr);
-				error("failed to read delta base object %s"
-				      " at offset %"PRIuMAX" from %s",
-				      sha1_to_hex(base_sha1), (uintmax_t)obj_offset,
-				      p->pack_name);
-				mark_bad_packed_object(p, base_sha1);
-				base = read_object(base_sha1, &type, &base_size);
-				external_base = base;
-			}
-		}
-
-		i = --delta_stack_nr;
-		obj_offset = delta_stack[i].obj_offset;
-		curpos = delta_stack[i].curpos;
-		delta_size = delta_stack[i].size;
-
-		if (!base)
-			continue;
-
-		delta_data = unpack_compressed_entry(p, &w_curs, curpos, delta_size);
-
-		if (!delta_data) {
-			error("failed to unpack compressed delta "
-			      "at offset %"PRIuMAX" from %s",
-			      (uintmax_t)curpos, p->pack_name);
-			data = NULL;
-			free(external_base);
-			continue;
-		}
-
-		data = patch_delta(base, base_size,
-				   delta_data, delta_size,
-				   &size);
-
-		/*
-		 * We could not apply the delta; warn the user, but keep going.
-		 * Our failure will be noticed either in the next iteration of
-		 * the loop, or if this is the final delta, in the caller when
-		 * we return NULL. Those code paths will take care of making
-		 * a more explicit warning and retrying with another copy of
-		 * the object.
-		 */
-		if (!data)
-			error("failed to apply delta");
-
-		free(delta_data);
-		free(external_base);
-	}
-
-	*final_type = type;
-	*final_size = size;
-
-	unuse_pack(&w_curs);
-
-	if (delta_stack != small_delta_stack)
-		free(delta_stack);
-
-	return data;
-}
-
-const unsigned char *nth_packed_object_sha1(struct packed_git *p,
-					    uint32_t n)
-{
-	const unsigned char *index = p->index_data;
-	if (!index) {
-		if (open_pack_index(p))
-			return NULL;
-		index = p->index_data;
-	}
-	if (n >= p->num_objects)
-		return NULL;
-	index += 4 * 256;
-	if (p->index_version == 1) {
-		return index + 24 * n + 4;
-	} else {
-		index += 8;
-		return index + 20 * n;
-	}
-}
-
-const struct object_id *nth_packed_object_oid(struct object_id *oid,
-					      struct packed_git *p,
-					      uint32_t n)
-{
-	const unsigned char *hash = nth_packed_object_sha1(p, n);
-	if (!hash)
-		return NULL;
-	hashcpy(oid->hash, hash);
-	return oid;
-}
-
-void check_pack_index_ptr(const struct packed_git *p, const void *vptr)
-{
-	const unsigned char *ptr = vptr;
-	const unsigned char *start = p->index_data;
-	const unsigned char *end = start + p->index_size;
-	if (ptr < start)
-		die(_("offset before start of pack index for %s (corrupt index?)"),
-		    p->pack_name);
-	/* No need to check for underflow; .idx files must be at least 8 bytes */
-	if (ptr >= end - 8)
-		die(_("offset beyond end of pack index for %s (truncated index?)"),
-		    p->pack_name);
-}
-
-off_t nth_packed_object_offset(const struct packed_git *p, uint32_t n)
-{
-	const unsigned char *index = p->index_data;
-	index += 4 * 256;
-	if (p->index_version == 1) {
-		return ntohl(*((uint32_t *)(index + 24 * n)));
-	} else {
-		uint32_t off;
-		index += 8 + p->num_objects * (20 + 4);
-		off = ntohl(*((uint32_t *)(index + 4 * n)));
-		if (!(off & 0x80000000))
-			return off;
-		index += p->num_objects * 4 + (off & 0x7fffffff) * 8;
-		check_pack_index_ptr(p, index);
-		return (((uint64_t)ntohl(*((uint32_t *)(index + 0)))) << 32) |
-				   ntohl(*((uint32_t *)(index + 4)));
-	}
-}
-
-off_t find_pack_entry_one(const unsigned char *sha1,
-				  struct packed_git *p)
-{
-	const uint32_t *level1_ofs = p->index_data;
-	const unsigned char *index = p->index_data;
-	unsigned hi, lo, stride;
-	static int use_lookup = -1;
-	static int debug_lookup = -1;
-
-	if (debug_lookup < 0)
-		debug_lookup = !!getenv("GIT_DEBUG_LOOKUP");
-
-	if (!index) {
-		if (open_pack_index(p))
-			return 0;
-		level1_ofs = p->index_data;
-		index = p->index_data;
-	}
-	if (p->index_version > 1) {
-		level1_ofs += 2;
-		index += 8;
-	}
-	index += 4 * 256;
-	hi = ntohl(level1_ofs[*sha1]);
-	lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1]));
-	if (p->index_version > 1) {
-		stride = 20;
-	} else {
-		stride = 24;
-		index += 4;
-	}
-
-	if (debug_lookup)
-		printf("%02x%02x%02x... lo %u hi %u nr %"PRIu32"\n",
-		       sha1[0], sha1[1], sha1[2], lo, hi, p->num_objects);
-
-	if (use_lookup < 0)
-		use_lookup = !!getenv("GIT_USE_LOOKUP");
-	if (use_lookup) {
-		int pos = sha1_entry_pos(index, stride, 0,
-					 lo, hi, p->num_objects, sha1);
-		if (pos < 0)
-			return 0;
-		return nth_packed_object_offset(p, pos);
-	}
-
-	do {
-		unsigned mi = (lo + hi) / 2;
-		int cmp = hashcmp(index + mi * stride, sha1);
-
-		if (debug_lookup)
-			printf("lo %u hi %u rg %u mi %u\n",
-			       lo, hi, hi - lo, mi);
-		if (!cmp)
-			return nth_packed_object_offset(p, mi);
-		if (cmp > 0)
-			hi = mi;
-		else
-			lo = mi+1;
-	} while (lo < hi);
-	return 0;
-}
-
-int is_pack_valid(struct packed_git *p)
-{
-	/* An already open pack is known to be valid. */
-	if (p->pack_fd != -1)
-		return 1;
-
-	/* If the pack has one window completely covering the
-	 * file size, the pack is known to be valid even if
-	 * the descriptor is not currently open.
-	 */
-	if (p->windows) {
-		struct pack_window *w = p->windows;
-
-		if (!w->offset && w->len == p->pack_size)
-			return 1;
-	}
-
-	/* Force the pack to open to prove its valid. */
-	return !open_packed_git(p);
-}
-
-static int fill_pack_entry(const unsigned char *sha1,
-			   struct pack_entry *e,
-			   struct packed_git *p)
-{
-	off_t offset;
-
-	if (p->num_bad_objects) {
-		unsigned i;
-		for (i = 0; i < p->num_bad_objects; i++)
-			if (!hashcmp(sha1, p->bad_object_sha1 + 20 * i))
-				return 0;
-	}
-
-	offset = find_pack_entry_one(sha1, p);
-	if (!offset)
-		return 0;
-
-	/*
-	 * We are about to tell the caller where they can locate the
-	 * requested object.  We better make sure the packfile is
-	 * still here and can be accessed before supplying that
-	 * answer, as it may have been deleted since the index was
-	 * loaded!
-	 */
-	if (!is_pack_valid(p))
-		return 0;
-	e->offset = offset;
-	e->p = p;
-	hashcpy(e->sha1, sha1);
-	return 1;
-}
-
-/*
- * Iff a pack file contains the object named by sha1, return true and
- * store its location to e.
- */
-static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e)
-{
-	struct mru_entry *p;
-
-	prepare_packed_git();
-	if (!packed_git)
-		return 0;
-
-	for (p = packed_git_mru->head; p; p = p->next) {
-		if (fill_pack_entry(sha1, e, p->item)) {
-			mru_mark(packed_git_mru, p);
-			return 1;
-		}
-	}
-	return 0;
-}
-
-struct packed_git *find_sha1_pack(const unsigned char *sha1,
-				  struct packed_git *packs)
-{
-	struct packed_git *p;
-
-	for (p = packs; p; p = p->next) {
-		if (find_pack_entry_one(sha1, p))
-			return p;
-	}
-	return NULL;
-
+	return parse_sha1_header_extended(hdr, &oi, 0);
 }
 
 static int sha1_loose_object_info(const unsigned char *sha1,
@@ -2905,6 +1078,7 @@ static int sha1_loose_object_info(const unsigned char *sha1,
 	git_zstream stream;
 	char hdr[32];
 	struct strbuf hdrbuf = STRBUF_INIT;
+	unsigned long size_scratch;
 
 	if (oi->delta_base_sha1)
 		hashclr(oi->delta_base_sha1);
@@ -2917,7 +1091,7 @@ 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) {
+	if (!oi->typep && !oi->typename && !oi->sizep && !oi->contentp) {
 		const char *path;
 		struct stat st;
 		if (stat_sha1_file(sha1, &st, &path) < 0)
@@ -2930,9 +1104,13 @@ static int sha1_loose_object_info(const unsigned char *sha1,
 	map = map_sha1_file(sha1, &mapsize);
 	if (!map)
 		return -1;
+
+	if (!oi->sizep)
+		oi->sizep = &size_scratch;
+
 	if (oi->disk_sizep)
 		*oi->disk_sizep = mapsize;
-	if ((flags & LOOKUP_UNKNOWN_OBJECT)) {
+	if ((flags & OBJECT_INFO_ALLOW_UNKNOWN_TYPE)) {
 		if (unpack_sha1_header_to_strbuf(&stream, map, mapsize, hdr, sizeof(hdr), &hdrbuf) < 0)
 			status = error("unable to unpack %s header with --allow-unknown-type",
 				       sha1_to_hex(sha1));
@@ -2947,77 +1125,91 @@ static int sha1_loose_object_info(const unsigned char *sha1,
 				       sha1_to_hex(sha1));
 	} else if ((status = parse_sha1_header_extended(hdr, oi, flags)) < 0)
 		status = error("unable to parse %s header", sha1_to_hex(sha1));
-	git_inflate_end(&stream);
+
+	if (status >= 0 && oi->contentp) {
+		*oi->contentp = unpack_sha1_rest(&stream, hdr,
+						 *oi->sizep, sha1);
+		if (!*oi->contentp) {
+			git_inflate_end(&stream);
+			status = -1;
+		}
+	} else
+		git_inflate_end(&stream);
+
 	munmap(map, mapsize);
 	if (status && oi->typep)
 		*oi->typep = status;
+	if (oi->sizep == &size_scratch)
+		oi->sizep = NULL;
 	strbuf_release(&hdrbuf);
+	oi->whence = OI_LOOSE;
 	return (status < 0) ? status : 0;
 }
 
 int sha1_object_info_extended(const unsigned char *sha1, struct object_info *oi, unsigned flags)
 {
-	struct cached_object *co;
+	static struct object_info blank_oi = OBJECT_INFO_INIT;
 	struct pack_entry e;
 	int rtype;
-	enum object_type real_type;
-	const unsigned char *real = lookup_replace_object_extended(sha1, flags);
-
-	co = find_cached_object(real);
-	if (co) {
-		if (oi->typep)
-			*(oi->typep) = co->type;
-		if (oi->sizep)
-			*(oi->sizep) = co->size;
-		if (oi->disk_sizep)
-			*(oi->disk_sizep) = 0;
-		if (oi->delta_base_sha1)
-			hashclr(oi->delta_base_sha1);
-		if (oi->typename)
-			strbuf_addstr(oi->typename, typename(co->type));
-		oi->whence = OI_CACHED;
-		return 0;
+	const unsigned char *real = (flags & OBJECT_INFO_LOOKUP_REPLACE) ?
+				    lookup_replace_object(sha1) :
+				    sha1;
+
+	if (!oi)
+		oi = &blank_oi;
+
+	if (!(flags & OBJECT_INFO_SKIP_CACHED)) {
+		struct cached_object *co = find_cached_object(real);
+		if (co) {
+			if (oi->typep)
+				*(oi->typep) = co->type;
+			if (oi->sizep)
+				*(oi->sizep) = co->size;
+			if (oi->disk_sizep)
+				*(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->contentp)
+				*oi->contentp = xmemdupz(co->buf, co->size);
+			oi->whence = OI_CACHED;
+			return 0;
+		}
 	}
 
 	if (!find_pack_entry(real, &e)) {
 		/* Most likely it's a loose object. */
-		if (!sha1_loose_object_info(real, oi, flags)) {
-			oi->whence = OI_LOOSE;
+		if (!sha1_loose_object_info(real, oi, flags))
 			return 0;
-		}
 
 		/* Not a loose object; someone else may have just packed it. */
-		reprepare_packed_git();
-		if (!find_pack_entry(real, &e))
+		if (flags & OBJECT_INFO_QUICK) {
 			return -1;
+		} else {
+			reprepare_packed_git();
+			if (!find_pack_entry(real, &e))
+				return -1;
+		}
 	}
 
-	/*
-	 * packed_object_info() does not follow the delta chain to
-	 * find out the real type, unless it is given oi->typep.
-	 */
-	if (oi->typename && !oi->typep)
-		oi->typep = &real_type;
+	if (oi == &blank_oi)
+		/*
+		 * We know that the caller doesn't actually need the
+		 * information below, so return early.
+		 */
+		return 0;
 
 	rtype = packed_object_info(e.p, e.offset, oi);
 	if (rtype < 0) {
 		mark_bad_packed_object(e.p, real);
-		if (oi->typep == &real_type)
-			oi->typep = NULL;
 		return sha1_object_info_extended(real, oi, 0);
-	} else if (in_delta_base_cache(e.p, e.offset)) {
-		oi->whence = OI_DBCACHED;
-	} else {
-		oi->whence = OI_PACKED;
+	} else if (oi->whence == OI_PACKED) {
 		oi->u.packed.offset = e.offset;
 		oi->u.packed.pack = e.p;
 		oi->u.packed.is_delta = (rtype == OBJ_REF_DELTA ||
 					 rtype == OBJ_OFS_DELTA);
 	}
-	if (oi->typename)
-		strbuf_addstr(oi->typename, typename(*oi->typep));
-	if (oi->typep == &real_type)
-		oi->typep = NULL;
 
 	return 0;
 }
@@ -3030,33 +1222,24 @@ int sha1_object_info(const unsigned char *sha1, unsigned long *sizep)
 
 	oi.typep = &type;
 	oi.sizep = sizep;
-	if (sha1_object_info_extended(sha1, &oi, LOOKUP_REPLACE_OBJECT) < 0)
+	if (sha1_object_info_extended(sha1, &oi,
+				      OBJECT_INFO_LOOKUP_REPLACE) < 0)
 		return -1;
 	return type;
 }
 
-static void *read_packed_sha1(const unsigned char *sha1,
-			      enum object_type *type, unsigned long *size)
+static void *read_object(const unsigned char *sha1, enum object_type *type,
+			 unsigned long *size)
 {
-	struct pack_entry e;
-	void *data;
+	struct object_info oi = OBJECT_INFO_INIT;
+	void *content;
+	oi.typep = type;
+	oi.sizep = size;
+	oi.contentp = &content;
 
-	if (!find_pack_entry(sha1, &e))
+	if (sha1_object_info_extended(sha1, &oi, 0) < 0)
 		return NULL;
-	data = cache_or_unpack_entry(e.p, e.offset, size, type);
-	if (!data) {
-		/*
-		 * We're probably in deep shit, but let's try to fetch
-		 * the required object anyway from another pack or loose.
-		 * This should happen only in the presence of a corrupted
-		 * pack, and is better than failing outright.
-		 */
-		error("failed to read object %s at offset %"PRIuMAX" from %s",
-		      sha1_to_hex(sha1), (uintmax_t)e.offset, e.p->pack_name);
-		mark_bad_packed_object(e.p, sha1);
-		data = read_object(sha1, type, size);
-	}
-	return data;
+	return content;
 }
 
 int pretend_sha1_file(void *buf, unsigned long len, enum object_type type,
@@ -3077,33 +1260,6 @@ int pretend_sha1_file(void *buf, unsigned long len, enum object_type type,
 	return 0;
 }
 
-static void *read_object(const unsigned char *sha1, enum object_type *type,
-			 unsigned long *size)
-{
-	unsigned long mapsize;
-	void *map, *buf;
-	struct cached_object *co;
-
-	co = find_cached_object(sha1);
-	if (co) {
-		*type = co->type;
-		*size = co->size;
-		return xmemdupz(co->buf, co->size);
-	}
-
-	buf = read_packed_sha1(sha1, type, size);
-	if (buf)
-		return buf;
-	map = map_sha1_file(sha1, &mapsize);
-	if (map) {
-		buf = unpack_sha1_file(map, mapsize, type, size, sha1);
-		munmap(map, mapsize);
-		return buf;
-	}
-	reprepare_packed_git();
-	return read_packed_sha1(sha1, type, size);
-}
-
 /*
  * This function dies on corrupt objects; the callers who want to
  * deal with them should arrange to call read_object() and give error
@@ -3112,13 +1268,14 @@ static void *read_object(const unsigned char *sha1, enum object_type *type,
 void *read_sha1_file_extended(const unsigned char *sha1,
 			      enum object_type *type,
 			      unsigned long *size,
-			      unsigned flag)
+			      int lookup_replace)
 {
 	void *data;
 	const struct packed_git *p;
 	const char *path;
 	struct stat st;
-	const unsigned char *repl = lookup_replace_object_extended(sha1, flag);
+	const unsigned char *repl = lookup_replace ? lookup_replace_object(sha1)
+						   : sha1;
 
 	errno = 0;
 	data = read_object(repl, type, size);
@@ -3421,7 +1578,7 @@ int write_sha1_file(const void *buf, unsigned long len, const char *type, unsign
 }
 
 int hash_sha1_file_literally(const void *buf, unsigned long len, const char *type,
-			     unsigned char *sha1, unsigned flags)
+			     struct object_id *oid, unsigned flags)
 {
 	char *header;
 	int hdrlen, status = 0;
@@ -3429,13 +1586,13 @@ 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, sha1, header, &hdrlen);
+	write_sha1_file_prepare(buf, len, type, oid->hash, header, &hdrlen);
 
 	if (!(flags & HASH_WRITE_OBJECT))
 		goto cleanup;
-	if (freshen_packed_object(sha1) || freshen_loose_object(sha1))
+	if (freshen_packed_object(oid->hash) || freshen_loose_object(oid->hash))
 		goto cleanup;
-	status = write_loose_object(sha1, header, hdrlen, buf, len, 0);
+	status = write_loose_object(oid->hash, header, hdrlen, buf, len, 0);
 
 cleanup:
 	free(header);
@@ -3453,7 +1610,7 @@ int force_object_loose(const unsigned char *sha1, time_t mtime)
 
 	if (has_loose_object(sha1))
 		return 0;
-	buf = read_packed_sha1(sha1, &type, &len);
+	buf = read_object(sha1, &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;
@@ -3463,34 +1620,12 @@ int force_object_loose(const unsigned char *sha1, time_t mtime)
 	return ret;
 }
 
-int has_pack_index(const unsigned char *sha1)
-{
-	struct stat st;
-	if (stat(sha1_pack_index_name(sha1), &st))
-		return 0;
-	return 1;
-}
-
-int has_sha1_pack(const unsigned char *sha1)
-{
-	struct pack_entry e;
-	return find_pack_entry(sha1, &e);
-}
-
 int has_sha1_file_with_flags(const unsigned char *sha1, int flags)
 {
-	struct pack_entry e;
-
 	if (!startup_info->have_repository)
 		return 0;
-	if (find_pack_entry(sha1, &e))
-		return 1;
-	if (has_loose_object(sha1))
-		return 1;
-	if (flags & HAS_SHA1_QUICK)
-		return 0;
-	reprepare_packed_git();
-	return find_pack_entry(sha1, &e);
+	return sha1_object_info_extended(sha1, NULL,
+					 flags | OBJECT_INFO_SKIP_CACHED) >= 0;
 }
 
 int has_object_file(const struct object_id *oid)
@@ -3546,7 +1681,7 @@ 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(path, buf, size, &nbuf,
+		if (convert_to_git(&the_index, path, buf, size, &nbuf,
 				   write_object ? safe_crlf : SAFE_CRLF_FALSE)) {
 			buf = strbuf_detach(&nbuf, &size);
 			re_allocated = 1;
@@ -3580,7 +1715,7 @@ static int index_stream_convert_blob(unsigned char *sha1, int fd,
 	assert(path);
 	assert(would_convert_to_git_filter_fd(path));
 
-	convert_to_git_filter_fd(path, fd, &sbuf,
+	convert_to_git_filter_fd(&the_index, path, fd, &sbuf,
 				 write_object ? safe_crlf : SAFE_CRLF_FALSE);
 
 	if (write_object)
@@ -3619,10 +1754,15 @@ static int index_core(unsigned char *sha1, int fd, size_t size,
 		ret = index_mem(sha1, "", size, type, path, flags);
 	} else if (size <= SMALL_FILE_SIZE) {
 		char *buf = xmalloc(size);
-		if (size == read_in_full(fd, buf, size))
-			ret = index_mem(sha1, buf, size, type, path, flags);
+		ssize_t read_result = read_in_full(fd, buf, size);
+		if (read_result < 0)
+			ret = error_errno("read error while indexing %s",
+					  path ? path : "<unknown>");
+		else if (read_result != size)
+			ret = error("short read while indexing %s",
+				    path ? path : "<unknown>");
 		else
-			ret = error_errno("short read");
+			ret = index_mem(sha1, buf, size, type, path, flags);
 		free(buf);
 	} else {
 		void *buf = xmmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
@@ -3647,14 +1787,14 @@ static int index_core(unsigned char *sha1, int fd, size_t size,
  * binary blobs, they generally do not want to get any conversion, and
  * callers should avoid this code path when filters are requested.
  */
-static int index_stream(unsigned char *sha1, int fd, size_t size,
+static int index_stream(struct object_id *oid, int fd, size_t size,
 			enum object_type type, const char *path,
 			unsigned flags)
 {
-	return index_bulk_checkin(sha1, fd, size, type, path, flags);
+	return index_bulk_checkin(oid->hash, fd, size, type, path, flags);
 }
 
-int index_fd(unsigned char *sha1, int fd, struct stat *st,
+int index_fd(struct object_id *oid, int fd, struct stat *st,
 	     enum object_type type, const char *path, unsigned flags)
 {
 	int ret;
@@ -3664,31 +1804,32 @@ int index_fd(unsigned char *sha1, 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(sha1, fd, path, flags);
+		ret = index_stream_convert_blob(oid->hash, fd, path, flags);
 	else if (!S_ISREG(st->st_mode))
-		ret = index_pipe(sha1, fd, type, path, flags);
+		ret = index_pipe(oid->hash, fd, type, path, flags);
 	else if (st->st_size <= big_file_threshold || type != OBJ_BLOB ||
-		 (path && would_convert_to_git(path)))
-		ret = index_core(sha1, fd, xsize_t(st->st_size), type, path,
+		 (path && would_convert_to_git(&the_index, path)))
+		ret = index_core(oid->hash, fd, xsize_t(st->st_size), type, path,
 				 flags);
 	else
-		ret = index_stream(sha1, fd, xsize_t(st->st_size), type, path,
+		ret = index_stream(oid, fd, xsize_t(st->st_size), type, path,
 				   flags);
 	close(fd);
 	return ret;
 }
 
-int index_path(unsigned char *sha1, const char *path, struct stat *st, unsigned flags)
+int index_path(struct object_id *oid, const char *path, struct stat *st, unsigned flags)
 {
 	int fd;
 	struct strbuf sb = STRBUF_INIT;
+	int rc = 0;
 
 	switch (st->st_mode & S_IFMT) {
 	case S_IFREG:
 		fd = open(path, O_RDONLY);
 		if (fd < 0)
 			return error_errno("open(\"%s\")", path);
-		if (index_fd(sha1, fd, st, OBJ_BLOB, path, flags) < 0)
+		if (index_fd(oid, fd, st, OBJ_BLOB, path, flags) < 0)
 			return error("%s: failed to insert into database",
 				     path);
 		break;
@@ -3696,23 +1837,22 @@ int index_path(unsigned char *sha1, const char *path, struct stat *st, unsigned
 		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, sha1);
-		else if (write_sha1_file(sb.buf, sb.len, blob_type, sha1))
-			return error("%s: failed to insert into database",
-				     path);
+			hash_sha1_file(sb.buf, sb.len, blob_type, oid->hash);
+		else if (write_sha1_file(sb.buf, sb.len, blob_type, oid->hash))
+			rc = error("%s: failed to insert into database", path);
 		strbuf_release(&sb);
 		break;
 	case S_IFDIR:
-		return resolve_gitlink_ref(path, "HEAD", sha1);
+		return resolve_gitlink_ref(path, "HEAD", oid->hash);
 	default:
 		return error("%s: unsupported file type", path);
 	}
-	return 0;
+	return rc;
 }
 
 int read_pack_header(int fd, struct pack_header *header)
 {
-	if (read_in_full(fd, header, sizeof(*header)) < sizeof(*header))
+	if (read_in_full(fd, header, sizeof(*header)) != sizeof(*header))
 		/* "eof before pack header was fully read" */
 		return PH_ERROR_EOF;
 
@@ -3735,22 +1875,32 @@ void assert_sha1_type(const unsigned char *sha1, enum object_type expect)
 		    typename(expect));
 }
 
-static int for_each_file_in_obj_subdir(int subdir_nr,
-				       struct strbuf *path,
-				       each_loose_object_fn obj_cb,
-				       each_loose_cruft_fn cruft_cb,
-				       each_loose_subdir_fn subdir_cb,
-				       void *data)
+int for_each_file_in_obj_subdir(unsigned int subdir_nr,
+				struct strbuf *path,
+				each_loose_object_fn obj_cb,
+				each_loose_cruft_fn cruft_cb,
+				each_loose_subdir_fn subdir_cb,
+				void *data)
 {
-	size_t baselen = path->len;
-	DIR *dir = opendir(path->buf);
+	size_t origlen, baselen;
+	DIR *dir;
 	struct dirent *de;
 	int r = 0;
 
+	if (subdir_nr > 0xff)
+		BUG("invalid loose object subdirectory: %x", subdir_nr);
+
+	origlen = path->len;
+	strbuf_complete(path, '/');
+	strbuf_addf(path, "%02x", subdir_nr);
+	baselen = path->len;
+
+	dir = opendir(path->buf);
 	if (!dir) {
-		if (errno == ENOENT)
-			return 0;
-		return error_errno("unable to open %s", path->buf);
+		if (errno != ENOENT)
+			r = error_errno("unable to open %s", path->buf);
+		strbuf_setlen(path, origlen);
+		return r;
 	}
 
 	while ((de = readdir(dir))) {
@@ -3788,6 +1938,8 @@ static int for_each_file_in_obj_subdir(int subdir_nr,
 	if (!r && subdir_cb)
 		r = subdir_cb(subdir_nr, path->buf, data);
 
+	strbuf_setlen(path, origlen);
+
 	return r;
 }
 
@@ -3797,15 +1949,12 @@ int for_each_loose_file_in_objdir_buf(struct strbuf *path,
 			    each_loose_subdir_fn subdir_cb,
 			    void *data)
 {
-	size_t baselen = path->len;
 	int r = 0;
 	int i;
 
 	for (i = 0; i < 256; i++) {
-		strbuf_addf(path, "/%02x", i);
 		r = for_each_file_in_obj_subdir(i, path, obj_cb, cruft_cb,
 						subdir_cb, data);
-		strbuf_setlen(path, baselen);
 		if (r)
 			break;
 	}
@@ -3868,46 +2017,6 @@ int for_each_loose_object(each_loose_object_fn cb, void *data, unsigned flags)
 	return foreach_alt_odb(loose_from_alt_odb, &alt);
 }
 
-static int for_each_object_in_pack(struct packed_git *p, each_packed_object_fn cb, void *data)
-{
-	uint32_t i;
-	int r = 0;
-
-	for (i = 0; i < p->num_objects; i++) {
-		struct object_id oid;
-
-		if (!nth_packed_object_oid(&oid, p, i))
-			return error("unable to get sha1 of object %u in %s",
-				     i, p->pack_name);
-
-		r = cb(&oid, p, i, data);
-		if (r)
-			break;
-	}
-	return r;
-}
-
-int for_each_packed_object(each_packed_object_fn cb, void *data, unsigned flags)
-{
-	struct packed_git *p;
-	int r = 0;
-	int pack_errors = 0;
-
-	prepare_packed_git();
-	for (p = packed_git; p; p = p->next) {
-		if ((flags & FOR_EACH_OBJECT_LOCAL_ONLY) && !p->pack_local)
-			continue;
-		if (open_pack_index(p)) {
-			pack_errors = 1;
-			continue;
-		}
-		r = for_each_object_in_pack(p, cb, data);
-		if (r)
-			break;
-	}
-	return r ? r : pack_errors;
-}
-
 static int check_stream_sha1(git_zstream *stream,
 			     const char *hdr,
 			     unsigned long size,