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tag: v0.99.7c
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Octocat-spinner-32-eaf2f5

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#include "object.h"
#include "blob.h"
#include "tree.h"
#include "commit.h"
#include "cache.h"
#include "tag.h"

struct object **objs;
int nr_objs;
static int obj_allocs;

int track_object_refs = 1;

static int find_object(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;
}

struct object *lookup_object(const unsigned char *sha1)
{
int pos = find_object(sha1);
if (pos >= 0)
return objs[pos];
return NULL;
}

void created_object(const unsigned char *sha1, struct object *obj)
{
int pos = find_object(sha1);

obj->parsed = 0;
memcpy(obj->sha1, sha1, 20);
obj->type = NULL;
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);
objs = xrealloc(objs, obj_allocs * sizeof(struct object *));
}

/* Insert it into the right place */
memmove(objs + pos + 1, objs + pos, (nr_objs - pos) *
sizeof(struct object *));

objs[pos] = obj;
nr_objs++;
}

void add_ref(struct object *refer, struct object *target)
{
struct object_list **pp, *p;

if (!track_object_refs)
return;

pp = &refer->refs;
while ((p = *pp) != NULL) {
if (p->item == target)
return;
pp = &p->next;
}

target->used = 1;
p = xmalloc(sizeof(*p));
p->item = target;
p->next = NULL;
*pp = p;
}

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;
}
}

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 = xmalloc(sizeof(*ret));
memset(ret, 0, sizeof(*ret));
created_object(sha1, &ret->object);
ret->object.type = NULL;
return &ret->object;
}
return obj;
}

struct object *parse_object(const unsigned char *sha1)
{
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));
if (!strcmp(type, "blob")) {
struct blob *blob = lookup_blob(sha1);
parse_blob_buffer(blob, buffer, size);
obj = &blob->object;
} else if (!strcmp(type, "tree")) {
struct tree *tree = lookup_tree(sha1);
parse_tree_buffer(tree, buffer, size);
obj = &tree->object;
} else if (!strcmp(type, "commit")) {
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")) {
struct tag *tag = lookup_tag(sha1);
parse_tag_buffer(tag, buffer, size);
obj = &tag->object;
} else {
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;
}
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