+#include "cache.h"
#include "object.h"
#include "blob.h"
#include "tree.h"
#include "commit.h"
-#include "cache.h"
#include "tag.h"
-#include <stdlib.h>
-#include <string.h>
struct object **objs;
-int nr_objs;
-static int obj_allocs;
+static int nr_objs;
+int obj_allocs;
-static int find_object(unsigned char *sha1)
+int track_object_refs = 1;
+
+static int hashtable_index(const unsigned char *sha1)
{
- int first = 0, last = nr_objs;
-
- while (first < last) {
- int next = (first + last) / 2;
- struct object *obj = objs[next];
- int cmp;
-
- cmp = memcmp(sha1, obj->sha1, 20);
- if (!cmp)
- return next;
- if (cmp < 0) {
- last = next;
- continue;
- }
- first = next+1;
- }
- return -first-1;
+ unsigned int i;
+ memcpy(&i, sha1, sizeof(unsigned int));
+ return (int)(i % obj_allocs);
+}
+
+static int find_object(const unsigned char *sha1)
+{
+ int i;
+
+ if (!objs)
+ return -1;
+
+ i = hashtable_index(sha1);
+ while (objs[i]) {
+ if (memcmp(sha1, objs[i]->sha1, 20) == 0)
+ return i;
+ i++;
+ if (i == obj_allocs)
+ i = 0;
+ }
+ return -1 - i;
}
-struct object *lookup_object(unsigned char *sha1)
+struct object *lookup_object(const unsigned char *sha1)
{
int pos = find_object(sha1);
if (pos >= 0)
return NULL;
}
-void created_object(unsigned char *sha1, struct object *obj)
+void created_object(const unsigned char *sha1, struct object *obj)
{
- int pos = find_object(sha1);
+ int pos;
obj->parsed = 0;
memcpy(obj->sha1, sha1, 20);
obj->refs = NULL;
obj->used = 0;
- if (pos >= 0)
- die("Inserting %s twice\n", sha1_to_hex(sha1));
- pos = -pos-1;
-
- if (obj_allocs == nr_objs) {
- obj_allocs = alloc_nr(obj_allocs);
+ if (obj_allocs - 1 <= nr_objs * 2) {
+ int i, count = obj_allocs;
+ obj_allocs = (obj_allocs < 32 ? 32 : 2 * obj_allocs);
objs = xrealloc(objs, obj_allocs * sizeof(struct object *));
+ memset(objs + count, 0, (obj_allocs - count)
+ * sizeof(struct object *));
+ for (i = 0; i < obj_allocs; i++)
+ if (objs[i]) {
+ int j = find_object(objs[i]->sha1);
+ if (j != i) {
+ j = -1 - j;
+ objs[j] = objs[i];
+ objs[i] = NULL;
+ }
+ }
}
- /* Insert it into the right place */
- memmove(objs + pos + 1, objs + pos, (nr_objs - pos) *
- sizeof(struct object *));
+ pos = find_object(sha1);
+ if (pos >= 0)
+ die("Inserting %s twice\n", sha1_to_hex(sha1));
+ pos = -pos-1;
objs[pos] = obj;
nr_objs++;
}
-void add_ref(struct object *refer, struct object *target)
+struct object_refs *alloc_object_refs(unsigned count)
+{
+ struct object_refs *refs;
+ size_t size = sizeof(*refs) + count*sizeof(struct object *);
+
+ refs = xcalloc(1, size);
+ refs->count = count;
+ return refs;
+}
+
+static int compare_object_pointers(const void *a, const void *b)
{
- struct object_list **pp = &refer->refs;
- struct object_list *p;
-
- while ((p = *pp) != NULL) {
- if (p->item == target)
- return;
- pp = &p->next;
+ const struct object * const *pa = a;
+ const struct object * const *pb = b;
+ if (*pa == *pb)
+ return 0;
+ else if (*pa < *pb)
+ return -1;
+ else
+ return 1;
+}
+
+void set_object_refs(struct object *obj, struct object_refs *refs)
+{
+ unsigned int i, j;
+
+ /* Do not install empty list of references */
+ if (refs->count < 1) {
+ free(refs);
+ return;
+ }
+
+ /* Sort the list and filter out duplicates */
+ qsort(refs->ref, refs->count, sizeof(refs->ref[0]),
+ compare_object_pointers);
+ for (i = j = 1; i < refs->count; i++) {
+ if (refs->ref[i] != refs->ref[i - 1])
+ refs->ref[j++] = refs->ref[i];
+ }
+ if (j < refs->count) {
+ /* Duplicates were found - reallocate list */
+ size_t size = sizeof(*refs) + j*sizeof(struct object *);
+ refs->count = j;
+ refs = xrealloc(refs, size);
}
- target->used = 1;
- p = xmalloc(sizeof(*p));
- p->item = target;
- p->next = NULL;
- *pp = p;
+ for (i = 0; i < refs->count; i++)
+ refs->ref[i]->used = 1;
+ obj->refs = refs;
}
void mark_reachable(struct object *obj, unsigned int mask)
{
- struct object_list *p = obj->refs;
-
+ if (!track_object_refs)
+ die("cannot do reachability with object refs turned off");
/* If we've been here already, don't bother */
if (obj->flags & mask)
return;
obj->flags |= mask;
- while (p) {
- mark_reachable(p->item, mask);
- p = p->next;
+ if (obj->refs) {
+ const struct object_refs *refs = obj->refs;
+ unsigned i;
+ for (i = 0; i < refs->count; i++)
+ mark_reachable(refs->ref[i], mask);
+ }
+}
+
+struct object *lookup_object_type(const unsigned char *sha1, const char *type)
+{
+ if (!type) {
+ return lookup_unknown_object(sha1);
+ } else if (!strcmp(type, blob_type)) {
+ return &lookup_blob(sha1)->object;
+ } else if (!strcmp(type, tree_type)) {
+ return &lookup_tree(sha1)->object;
+ } else if (!strcmp(type, commit_type)) {
+ return &lookup_commit(sha1)->object;
+ } else if (!strcmp(type, tag_type)) {
+ return &lookup_tag(sha1)->object;
+ } else {
+ error("Unknown type %s", type);
+ return NULL;
+ }
+}
+
+union any_object {
+ struct object object;
+ struct commit commit;
+ struct tree tree;
+ struct blob blob;
+ struct tag tag;
+};
+
+struct object *lookup_unknown_object(const unsigned char *sha1)
+{
+ struct object *obj = lookup_object(sha1);
+ if (!obj) {
+ union any_object *ret = xcalloc(1, sizeof(*ret));
+ created_object(sha1, &ret->object);
+ ret->object.type = NULL;
+ return &ret->object;
}
+ return obj;
}
-struct object *parse_object(unsigned char *sha1)
+struct object *parse_object(const unsigned char *sha1)
{
- unsigned long mapsize;
- void *map = map_sha1_file(sha1, &mapsize);
- if (map) {
- char type[100];
- unsigned long size;
- void *buffer = unpack_sha1_file(map, mapsize, type, &size);
- munmap(map, mapsize);
- if (!buffer)
- return NULL;
+ unsigned long size;
+ char type[20];
+ void *buffer = read_sha1_file(sha1, type, &size);
+ if (buffer) {
+ struct object *obj;
if (check_sha1_signature(sha1, buffer, size, type) < 0)
printf("sha1 mismatch %s\n", sha1_to_hex(sha1));
- free(buffer);
- if (!strcmp(type, "blob")) {
- struct blob *ret = lookup_blob(sha1);
- parse_blob(ret);
- return &ret->object;
- } else if (!strcmp(type, "tree")) {
- struct tree *ret = lookup_tree(sha1);
- parse_tree(ret);
- return &ret->object;
- } else if (!strcmp(type, "commit")) {
- struct commit *ret = lookup_commit(sha1);
- parse_commit(ret);
- return &ret->object;
- } else if (!strcmp(type, "tag")) {
- struct tag *ret = lookup_tag(sha1);
- parse_tag(ret);
- return &ret->object;
+ if (!strcmp(type, blob_type)) {
+ struct blob *blob = lookup_blob(sha1);
+ parse_blob_buffer(blob, buffer, size);
+ obj = &blob->object;
+ } else if (!strcmp(type, tree_type)) {
+ struct tree *tree = lookup_tree(sha1);
+ parse_tree_buffer(tree, buffer, size);
+ obj = &tree->object;
+ } else if (!strcmp(type, commit_type)) {
+ struct commit *commit = lookup_commit(sha1);
+ parse_commit_buffer(commit, buffer, size);
+ if (!commit->buffer) {
+ commit->buffer = buffer;
+ buffer = NULL;
+ }
+ obj = &commit->object;
+ } else if (!strcmp(type, tag_type)) {
+ struct tag *tag = lookup_tag(sha1);
+ parse_tag_buffer(tag, buffer, size);
+ obj = &tag->object;
} else {
- return NULL;
+ obj = NULL;
}
+ free(buffer);
+ return obj;
}
return NULL;
}
+
+struct object_list *object_list_insert(struct object *item,
+ struct object_list **list_p)
+{
+ struct object_list *new_list = xmalloc(sizeof(struct object_list));
+ new_list->item = item;
+ new_list->next = *list_p;
+ *list_p = new_list;
+ return new_list;
+}
+
+void object_list_append(struct object *item,
+ struct object_list **list_p)
+{
+ while (*list_p) {
+ list_p = &((*list_p)->next);
+ }
+ *list_p = xmalloc(sizeof(struct object_list));
+ (*list_p)->next = NULL;
+ (*list_p)->item = item;
+}
+
+unsigned object_list_length(struct object_list *list)
+{
+ unsigned ret = 0;
+ while (list) {
+ list = list->next;
+ ret++;
+ }
+ return ret;
+}
+
+int object_list_contains(struct object_list *list, struct object *obj)
+{
+ while (list) {
+ if (list->item == obj)
+ return 1;
+ list = list->next;
+ }
+ return 0;
+}