#include "delta.h"
#include "list.h"
#include "streaming.h"
+#include "sha1-lookup.h"
char *odb_pack_name(struct strbuf *buf,
const unsigned char *sha1,
return 0;
}
-int open_packed_git(struct packed_git *p)
+static int open_packed_git(struct packed_git *p)
{
if (!open_packed_git_1(p))
return 0;
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 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);
+
+ while (lo < hi) {
+ 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;
+ }
+ 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);
+}
+
+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;
+
+}
+
+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.
+ */
+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;
+}
+
+int has_sha1_pack(const unsigned char *sha1)
+{
+ struct pack_entry e;
+ return find_pack_entry(sha1, &e);
+}
+
+int has_pack_index(const unsigned char *sha1)
+{
+ struct stat st;
+ if (stat(sha1_pack_index_name(sha1), &st))
+ return 0;
+ return 1;
+}
+
+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;
+}