1#ifndef OBJECT_H 2#define OBJECT_H 3 4struct object_list { 5struct object *item; 6struct object_list *next; 7}; 8 9struct object_array { 10unsigned int nr; 11unsigned int alloc; 12struct object_array_entry { 13struct object *item; 14/* 15 * name or NULL. If non-NULL, the memory pointed to 16 * is owned by this object *except* if it points at 17 * object_array_slopbuf, which is a static copy of the 18 * empty string. 19 */ 20char*name; 21unsigned mode; 22struct object_context *context; 23} *objects; 24}; 25 26#define OBJECT_ARRAY_INIT { 0, 0, NULL } 27 28#define TYPE_BITS 3 29/* 30 * object flag allocation: 31 * revision.h: 0---------10 26 32 * fetch-pack.c: 0---4 33 * walker.c: 0-2 34 * upload-pack.c: 11----------------19 35 * builtin/blame.c: 12-13 36 * bisect.c: 16 37 * bundle.c: 16 38 * http-push.c: 16-----19 39 * commit.c: 16-----19 40 * sha1_name.c: 20 41 */ 42#define FLAG_BITS 27 43 44/* 45 * The object type is stored in 3 bits. 46 */ 47struct object { 48unsigned parsed :1; 49unsigned used :1; 50unsigned type : TYPE_BITS; 51unsigned flags : FLAG_BITS; 52unsigned char sha1[20]; 53}; 54 55externconst char*typename(unsigned int type); 56externinttype_from_string(const char*str); 57 58/* 59 * Return the current number of buckets in the object hashmap. 60 */ 61externunsigned intget_max_object_index(void); 62 63/* 64 * Return the object from the specified bucket in the object hashmap. 65 */ 66externstruct object *get_indexed_object(unsigned int); 67 68/* 69 * This can be used to see if we have heard of the object before, but 70 * it can return "yes we have, and here is a half-initialised object" 71 * for an object that we haven't loaded/parsed yet. 72 * 73 * When parsing a commit to create an in-core commit object, its 74 * parents list holds commit objects that represent its parents, but 75 * they are expected to be lazily initialized and do not know what 76 * their trees or parents are yet. When this function returns such a 77 * half-initialised objects, the caller is expected to initialize them 78 * by calling parse_object() on them. 79 */ 80struct object *lookup_object(const unsigned char*sha1); 81 82externvoid*create_object(const unsigned char*sha1,int type,void*obj); 83 84/* 85 * Returns the object, having parsed it to find out what it is. 86 * 87 * Returns NULL if the object is missing or corrupt. 88 */ 89struct object *parse_object(const unsigned char*sha1); 90 91/* 92 * Like parse_object, but will die() instead of returning NULL. If the 93 * "name" parameter is not NULL, it is included in the error message 94 * (otherwise, the sha1 hex is given). 95 */ 96struct object *parse_object_or_die(const unsigned char*sha1,const char*name); 97 98/* Given the result of read_sha1_file(), returns the object after 99 * parsing it. eaten_p indicates if the object has a borrowed copy 100 * of buffer and the caller should not free() it. 101 */ 102struct object *parse_object_buffer(const unsigned char*sha1,enum object_type type,unsigned long size,void*buffer,int*eaten_p); 103 104/** Returns the object, with potentially excess memory allocated. **/ 105struct object *lookup_unknown_object(const unsigned char*sha1); 106 107struct object_list *object_list_insert(struct object *item, 108struct object_list **list_p); 109 110intobject_list_contains(struct object_list *list,struct object *obj); 111 112/* Object array handling .. */ 113voidadd_object_array(struct object *obj,const char*name,struct object_array *array); 114voidadd_object_array_with_mode(struct object *obj,const char*name,struct object_array *array,unsigned mode); 115voidadd_object_array_with_context(struct object *obj,const char*name,struct object_array *array,struct object_context *context); 116 117typedefint(*object_array_each_func_t)(struct object_array_entry *,void*); 118 119/* 120 * Apply want to each entry in array, retaining only the entries for 121 * which the function returns true. Preserve the order of the entries 122 * that are retained. 123 */ 124voidobject_array_filter(struct object_array *array, 125 object_array_each_func_t want,void*cb_data); 126 127/* 128 * Remove from array all but the first entry with a given name. 129 * Warning: this function uses an O(N^2) algorithm. 130 */ 131voidobject_array_remove_duplicates(struct object_array *array); 132 133voidclear_object_flags(unsigned flags); 134 135#endif/* OBJECT_H */