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* This file is part of libgit2, distributed under the GNU GPL v2 with

* a Linking Exception. For full terms see the included COPYING file.

#include <stdarg.h>

#include "git2/object.h"

#include "common.h"

#include "repository.h"

#include "commit.h"

#include "tree.h"

#include "blob.h"

#include "tag.h"

static const int OBJECT_BASE_SIZE = 4096;

static struct {

const char *str; /* type name string */

int loose; /* valid loose object type flag */

size_t size; /* size in bytes of the object structure */

} git_objects_table[] = {

/* 0 = GIT_OBJ__EXT1 */

{ "", 0, 0},

/* 1 = GIT_OBJ_COMMIT */

{ "commit", 1, sizeof(struct git_commit)},

/* 2 = GIT_OBJ_TREE */

{ "tree", 1, sizeof(struct git_tree) },

/* 3 = GIT_OBJ_BLOB */

{ "blob", 1, sizeof(struct git_blob) },

/* 4 = GIT_OBJ_TAG */

{ "tag", 1, sizeof(struct git_tag) },

/* 5 = GIT_OBJ__EXT2 */

{ "", 0, 0 },

/* 6 = GIT_OBJ_OFS_DELTA */

{ "OFS_DELTA", 0, 0 },

/* 7 = GIT_OBJ_REF_DELTA */

{ "REF_DELTA", 0, 0 }

};

static int create_object(git_object **object_out, git_otype type)

{

git_object *object = NULL;

assert(object_out);

*object_out = NULL;

switch (type) {

case GIT_OBJ_COMMIT:

case GIT_OBJ_TAG:

case GIT_OBJ_BLOB:

case GIT_OBJ_TREE:

object = git__malloc(git_object__size(type));

if (object == NULL)

return GIT_ENOMEM;

memset(object, 0x0, git_object__size(type));

break;

default:

return git__throw(GIT_EINVALIDTYPE, "The given type is invalid");

}

object->type = type;

*object_out = object;

return GIT_SUCCESS;

}

int git_object_lookup_prefix(git_object **object_out, git_repository *repo, const git_oid *id, unsigned int len, git_otype type)

{

git_object *object = NULL;

git_odb_object *odb_obj;

int error = GIT_SUCCESS;

assert(repo && object_out && id);

if (len < GIT_OID_MINPREFIXLEN)

return git__throw(GIT_EAMBIGUOUSOIDPREFIX,

"Failed to lookup object. Prefix length is lower than %d.", GIT_OID_MINPREFIXLEN);

if (len > GIT_OID_HEXSZ)

len = GIT_OID_HEXSZ;

if (len == GIT_OID_HEXSZ) {

/* We want to match the full id : we can first look up in the cache,

* since there is no need to check for non ambiguousity

object = git_cache_get(&repo->objects, id);

if (object != NULL) {

if (type != GIT_OBJ_ANY && type != object->type)

{

git_object_close(object);

return git__throw(GIT_EINVALIDTYPE, "Failed to lookup object. The given type does not match the type on the ODB");

}

*object_out = object;

return GIT_SUCCESS;

}

/* Object was not found in the cache, let's explore the backends.

* We could just use git_odb_read_unique_short_oid,

* it is the same cost for packed and loose object backends,

* but it may be much more costly for sqlite and hiredis.

error = git_odb_read(&odb_obj, repo->db, id);

} else {

git_oid short_oid;

/* We copy the first len*4 bits from id and fill the remaining with 0s */

memcpy(short_oid.id, id->id, (len + 1) / 2);

if (len % 2)

short_oid.id[len / 2] &= 0xF0;

memset(short_oid.id + (len + 1) / 2, 0, (GIT_OID_HEXSZ - len) / 2);

/* If len < GIT_OID_HEXSZ (a strict short oid was given), we have

* 2 options :

* - We always search in the cache first. If we find that short oid is

* ambiguous, we can stop. But in all the other cases, we must then

* explore all the backends (to find an object if there was match,

* or to check that oid is not ambiguous if we have found 1 match in

* the cache)

* - We never explore the cache, go right to exploring the backends

* We chose the latter : we explore directly the backends.

error = git_odb_read_prefix(&odb_obj, repo->db, &short_oid, len);

}

if (error < GIT_SUCCESS)

return git__rethrow(error, "Failed to lookup object");

if (type != GIT_OBJ_ANY && type != odb_obj->raw.type) {

git_odb_object_close(odb_obj);

return git__throw(GIT_EINVALIDTYPE, "Failed to lookup object. The given type does not match the type on the ODB");

}

type = odb_obj->raw.type;

if ((error = create_object(&object, type)) < GIT_SUCCESS)

return git__rethrow(error, "Failed to lookup object");

/* Initialize parent object */

git_oid_cpy(&object->cached.oid, &odb_obj->cached.oid);

object->repo = repo;

switch (type) {

case GIT_OBJ_COMMIT:

error = git_commit__parse((git_commit *)object, odb_obj);

break;

case GIT_OBJ_TREE:

error = git_tree__parse((git_tree *)object, odb_obj);

break;

case GIT_OBJ_TAG:

error = git_tag__parse((git_tag *)object, odb_obj);

break;

case GIT_OBJ_BLOB:

error = git_blob__parse((git_blob *)object, odb_obj);

break;

default:

break;

}

git_odb_object_close(odb_obj);

if (error < GIT_SUCCESS) {

git_object__free(object);

return git__rethrow(error, "Failed to lookup object");

}

*object_out = git_cache_try_store(&repo->objects, object);

return GIT_SUCCESS;

}

int git_object_lookup(git_object **object_out, git_repository *repo, const git_oid *id, git_otype type) {

return git_object_lookup_prefix(object_out, repo, id, GIT_OID_HEXSZ, type);

}

void git_object__free(void *_obj)

{

git_object *object = (git_object *)_obj;

assert(object);

switch (object->type) {

case GIT_OBJ_COMMIT:

git_commit__free((git_commit *)object);

break;

case GIT_OBJ_TREE:

git_tree__free((git_tree *)object);

break;

case GIT_OBJ_TAG:

git_tag__free((git_tag *)object);

break;

case GIT_OBJ_BLOB:

git_blob__free((git_blob *)object);

break;

default:

git__free(object);

break;

}

void git_object_close(git_object *object)

{

if (object == NULL)

return;

git_cached_obj_decref((git_cached_obj *)object, git_object__free);

}

const git_oid *git_object_id(const git_object *obj)

{

assert(obj);

return &obj->cached.oid;

}

git_otype git_object_type(const git_object *obj)

{

assert(obj);

return obj->type;

}

git_repository *git_object_owner(const git_object *obj)

{

assert(obj);

return obj->repo;

}

const char *git_object_type2string(git_otype type)

{

if (type < 0 || ((size_t) type) >= ARRAY_SIZE(git_objects_table))

return "";

return git_objects_table[type].str;

}

git_otype git_object_string2type(const char *str)

{

size_t i;

if (!str || !*str)

return GIT_OBJ_BAD;

for (i = 0; i < ARRAY_SIZE(git_objects_table); i++)

if (!strcmp(str, git_objects_table[i].str))

return (git_otype)i;

return GIT_OBJ_BAD;

}

int git_object_typeisloose(git_otype type)

{

if (type < 0 || ((size_t) type) >= ARRAY_SIZE(git_objects_table))

return 0;

return git_objects_table[type].loose;

}

size_t git_object__size(git_otype type)

{

if (type < 0 || ((size_t) type) >= ARRAY_SIZE(git_objects_table))

return 0;

return git_objects_table[type].size;

}

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