Andrew's git - gitweb.git/blob

   1#include "cache.h"
   2#include "object.h"
   3#include "blob.h"
   4#include "tree.h"
   5#include "commit.h"
   6#include "tag.h"
   7
   8static struct object **obj_hash;
   9static int nr_objs, obj_hash_size;
  10
  11unsigned int get_max_object_index(void)
  12{
  13        return obj_hash_size;
  14}
  15
  16struct object *get_indexed_object(unsigned int idx)
  17{
  18        return obj_hash[idx];
  19}
  20
  21static const char *object_type_strings[] = {
  22        NULL,           /* OBJ_NONE = 0 */
  23        "commit",       /* OBJ_COMMIT = 1 */
  24        "tree",         /* OBJ_TREE = 2 */
  25        "blob",         /* OBJ_BLOB = 3 */
  26        "tag",          /* OBJ_TAG = 4 */
  27};
  28
  29const char *typename(unsigned int type)
  30{
  31        if (type >= ARRAY_SIZE(object_type_strings))
  32                return NULL;
  33        return object_type_strings[type];
  34}
  35
  36int type_from_string(const char *str)
  37{
  38        int i;
  39
  40        for (i = 1; i < ARRAY_SIZE(object_type_strings); i++)
  41                if (!strcmp(str, object_type_strings[i]))
  42                        return i;
  43        die("invalid object type \"%s\"", str);
  44}
  45
  46static unsigned int hash_obj(struct object *obj, unsigned int n)
  47{
  48        unsigned int hash;
  49        memcpy(&hash, obj->sha1, sizeof(unsigned int));
  50        return hash % n;
  51}
  52
  53static void insert_obj_hash(struct object *obj, struct object **hash, unsigned int size)
  54{
  55        unsigned int j = hash_obj(obj, size);
  56
  57        while (hash[j]) {
  58                j++;
  59                if (j >= size)
  60                        j = 0;
  61        }
  62        hash[j] = obj;
  63}
  64
  65static unsigned int hashtable_index(const unsigned char *sha1)
  66{
  67        unsigned int i;
  68        memcpy(&i, sha1, sizeof(unsigned int));
  69        return i % obj_hash_size;
  70}
  71
  72struct object *lookup_object(const unsigned char *sha1)
  73{
  74        unsigned int i;
  75        struct object *obj;
  76
  77        if (!obj_hash)
  78                return NULL;
  79
  80        i = hashtable_index(sha1);
  81        while ((obj = obj_hash[i]) != NULL) {
  82                if (!hashcmp(sha1, obj->sha1))
  83                        break;
  84                i++;
  85                if (i == obj_hash_size)
  86                        i = 0;
  87        }
  88        return obj;
  89}
  90
  91static void grow_object_hash(void)
  92{
  93        int i;
  94        int new_hash_size = obj_hash_size < 32 ? 32 : 2 * obj_hash_size;
  95        struct object **new_hash;
  96
  97        new_hash = xcalloc(new_hash_size, sizeof(struct object *));
  98        for (i = 0; i < obj_hash_size; i++) {
  99                struct object *obj = obj_hash[i];
 100                if (!obj)
 101                        continue;
 102                insert_obj_hash(obj, new_hash, new_hash_size);
 103        }
 104        free(obj_hash);
 105        obj_hash = new_hash;
 106        obj_hash_size = new_hash_size;
 107}
 108
 109void *create_object(const unsigned char *sha1, int type, void *o)
 110{
 111        struct object *obj = o;
 112
 113        obj->parsed = 0;
 114        obj->used = 0;
 115        obj->type = type;
 116        obj->flags = 0;
 117        hashcpy(obj->sha1, sha1);
 118
 119        if (obj_hash_size - 1 <= nr_objs * 2)
 120                grow_object_hash();
 121
 122        insert_obj_hash(obj, obj_hash, obj_hash_size);
 123        nr_objs++;
 124        return obj;
 125}
 126
 127struct object *lookup_unknown_object(const unsigned char *sha1)
 128{
 129        struct object *obj = lookup_object(sha1);
 130        if (!obj)
 131                obj = create_object(sha1, OBJ_NONE, alloc_object_node());
 132        return obj;
 133}
 134
 135struct object *parse_object_buffer(const unsigned char *sha1, enum object_type type, unsigned long size, void *buffer, int *eaten_p)
 136{
 137        struct object *obj;
 138        int eaten = 0;
 139
 140        obj = NULL;
 141        if (type == OBJ_BLOB) {
 142                struct blob *blob = lookup_blob(sha1);
 143                if (blob) {
 144                        if (parse_blob_buffer(blob, buffer, size))
 145                                return NULL;
 146                        obj = &blob->object;
 147                }
 148        } else if (type == OBJ_TREE) {
 149                struct tree *tree = lookup_tree(sha1);
 150                if (tree) {
 151                        obj = &tree->object;
 152                        if (!tree->buffer)
 153                                tree->object.parsed = 0;
 154                        if (!tree->object.parsed) {
 155                                if (parse_tree_buffer(tree, buffer, size))
 156                                        return NULL;
 157                                eaten = 1;
 158                        }
 159                }
 160        } else if (type == OBJ_COMMIT) {
 161                struct commit *commit = lookup_commit(sha1);
 162                if (commit) {
 163                        if (parse_commit_buffer(commit, buffer, size))
 164                                return NULL;
 165                        if (!commit->buffer) {
 166                                commit->buffer = buffer;
 167                                eaten = 1;
 168                        }
 169                        obj = &commit->object;
 170                }
 171        } else if (type == OBJ_TAG) {
 172                struct tag *tag = lookup_tag(sha1);
 173                if (tag) {
 174                        if (parse_tag_buffer(tag, buffer, size))
 175                               return NULL;
 176                        obj = &tag->object;
 177                }
 178        } else {
 179                warning("object %s has unknown type id %d", sha1_to_hex(sha1), type);
 180                obj = NULL;
 181        }
 182        if (obj && obj->type == OBJ_NONE)
 183                obj->type = type;
 184        *eaten_p = eaten;
 185        return obj;
 186}
 187
 188struct object *parse_object(const unsigned char *sha1)
 189{
 190        unsigned long size;
 191        enum object_type type;
 192        int eaten;
 193        const unsigned char *repl = lookup_replace_object(sha1);
 194        void *buffer;
 195        struct object *obj;
 196
 197        obj = lookup_object(sha1);
 198        if (obj && obj->parsed)
 199                return obj;
 200
 201        if ((obj && obj->type == OBJ_BLOB) ||
 202            (!obj && has_sha1_file(sha1) &&
 203             sha1_object_info(sha1, NULL) == OBJ_BLOB)) {
 204                if (check_sha1_signature(repl, NULL, 0, NULL) < 0) {
 205                        error("sha1 mismatch %s", sha1_to_hex(repl));
 206                        return NULL;
 207                }
 208                parse_blob_buffer(lookup_blob(sha1), NULL, 0);
 209                return lookup_object(sha1);
 210        }
 211
 212        buffer = read_sha1_file(sha1, &type, &size);
 213        if (buffer) {
 214                if (check_sha1_signature(repl, buffer, size, typename(type)) < 0) {
 215                        free(buffer);
 216                        error("sha1 mismatch %s", sha1_to_hex(repl));
 217                        return NULL;
 218                }
 219
 220                obj = parse_object_buffer(sha1, type, size, buffer, &eaten);
 221                if (!eaten)
 222                        free(buffer);
 223                return obj;
 224        }
 225        return NULL;
 226}
 227
 228struct object_list *object_list_insert(struct object *item,
 229                                       struct object_list **list_p)
 230{
 231        struct object_list *new_list = xmalloc(sizeof(struct object_list));
 232        new_list->item = item;
 233        new_list->next = *list_p;
 234        *list_p = new_list;
 235        return new_list;
 236}
 237
 238int object_list_contains(struct object_list *list, struct object *obj)
 239{
 240        while (list) {
 241                if (list->item == obj)
 242                        return 1;
 243                list = list->next;
 244        }
 245        return 0;
 246}
 247
 248void add_object_array(struct object *obj, const char *name, struct object_array *array)
 249{
 250        add_object_array_with_mode(obj, name, array, S_IFINVALID);
 251}
 252
 253void add_object_array_with_mode(struct object *obj, const char *name, struct object_array *array, unsigned mode)
 254{
 255        unsigned nr = array->nr;
 256        unsigned alloc = array->alloc;
 257        struct object_array_entry *objects = array->objects;
 258
 259        if (nr >= alloc) {
 260                alloc = (alloc + 32) * 2;
 261                objects = xrealloc(objects, alloc * sizeof(*objects));
 262                array->alloc = alloc;
 263                array->objects = objects;
 264        }
 265        objects[nr].item = obj;
 266        objects[nr].name = name;
 267        objects[nr].mode = mode;
 268        array->nr = ++nr;
 269}
 270
 271void object_array_remove_duplicates(struct object_array *array)
 272{
 273        unsigned int ref, src, dst;
 274        struct object_array_entry *objects = array->objects;
 275
 276        for (ref = 0; ref + 1 < array->nr; ref++) {
 277                for (src = ref + 1, dst = src;
 278                     src < array->nr;
 279                     src++) {
 280                        if (!strcmp(objects[ref].name, objects[src].name))
 281                                continue;
 282                        if (src != dst)
 283                                objects[dst] = objects[src];
 284                        dst++;
 285                }
 286                array->nr = dst;
 287        }
 288}
 289
 290void clear_object_flags(unsigned flags)
 291{
 292        int i;
 293
 294        for (i=0; i < obj_hash_size; i++) {
 295                struct object *obj = obj_hash[i];
 296                if (obj)
 297                        obj->flags &= ~flags;
 298        }
 299}