| /* |
| * This file is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License, version 2, |
| * as published by the Free Software Foundation. |
| * |
| * In addition to the permissions in the GNU General Public License, |
| * the authors give you unlimited permission to link the compiled |
| * version of this file into combinations with other programs, |
| * and to distribute those combinations without any restriction |
| * coming from the use of this file. (The General Public License |
| * restrictions do apply in other respects; for example, they cover |
| * modification of the file, and distribution when not linked into |
| * a combined executable.) |
| * |
| * This file is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; see the file COPYING. If not, write to |
| * the Free Software Foundation, 51 Franklin Street, Fifth Floor, |
| * Boston, MA 02110-1301, USA. |
| */ |
| #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 } |
| }; |
| |
| /* |
| * Object source methods |
| * |
| * Abstract buffer methods that allow the writeback system |
| * to prepare the contents of any git file in-memory before |
| * writing them to disk. |
| */ |
| static int source_resize(git_odb_source *src) |
| { |
| size_t write_offset, new_size; |
| void *new_data; |
| |
| write_offset = (size_t)((char *)src->write_ptr - (char *)src->raw.data); |
| |
| new_size = src->raw.len * 2; |
| if ((new_data = git__malloc(new_size)) == NULL) |
| return GIT_ENOMEM; |
| |
| memcpy(new_data, src->raw.data, src->written_bytes); |
| free(src->raw.data); |
| |
| src->raw.data = new_data; |
| src->raw.len = new_size; |
| src->write_ptr = (char *)new_data + write_offset; |
| |
| return GIT_SUCCESS; |
| } |
| |
| int git__source_printf(git_odb_source *source, const char *format, ...) |
| { |
| va_list arglist; |
| int len; |
| |
| assert(source->open && source->write_ptr); |
| |
| va_start(arglist, format); |
| |
| len = vsnprintf(source->write_ptr, source->raw.len - source->written_bytes, format, arglist); |
| |
| while (source->written_bytes + len >= source->raw.len) { |
| if (source_resize(source) < GIT_SUCCESS) |
| return GIT_ENOMEM; |
| |
| len = vsnprintf(source->write_ptr, source->raw.len - source->written_bytes, format, arglist); |
| } |
| |
| source->write_ptr = (char *)source->write_ptr + len; |
| source->written_bytes += len; |
| |
| return GIT_SUCCESS; |
| } |
| |
| int git__source_write(git_odb_source *source, const void *bytes, size_t len) |
| { |
| assert(source); |
| |
| assert(source->open && source->write_ptr); |
| |
| while (source->written_bytes + len >= source->raw.len) { |
| if (source_resize(source) < GIT_SUCCESS) |
| return GIT_ENOMEM; |
| } |
| |
| memcpy(source->write_ptr, bytes, len); |
| source->write_ptr = (char *)source->write_ptr + len; |
| source->written_bytes += len; |
| |
| return GIT_SUCCESS; |
| } |
| |
| static void prepare_write(git_object *object) |
| { |
| if (object->source.write_ptr != NULL || object->source.open) |
| git_object__source_close(object); |
| |
| /* TODO: proper size calculation */ |
| object->source.raw.data = git__malloc(OBJECT_BASE_SIZE); |
| object->source.raw.len = OBJECT_BASE_SIZE; |
| |
| object->source.write_ptr = object->source.raw.data; |
| object->source.written_bytes = 0; |
| |
| object->source.open = 1; |
| } |
| |
| static int write_back(git_object *object) |
| { |
| int error; |
| git_oid new_id; |
| |
| assert(object); |
| |
| assert(object->source.open); |
| assert(object->modified); |
| |
| object->source.raw.len = object->source.written_bytes; |
| |
| if ((error = git_odb_write(&new_id, object->repo->db, &object->source.raw)) < GIT_SUCCESS) |
| return error; |
| |
| if (object->in_memory) { |
| int idx = git_vector_search(&object->repo->memory_objects, object); |
| git_vector_remove(&object->repo->memory_objects, idx); |
| } else { |
| git_hashtable_remove(object->repo->objects, &object->id); |
| } |
| |
| git_oid_cpy(&object->id, &new_id); |
| git_hashtable_insert(object->repo->objects, &object->id, object); |
| |
| object->source.write_ptr = NULL; |
| object->source.written_bytes = 0; |
| |
| object->modified = 0; |
| object->in_memory = 0; |
| |
| git_object__source_close(object); |
| return GIT_SUCCESS; |
| } |
| |
| int git_object__source_open(git_object *object) |
| { |
| int error; |
| |
| assert(object && !object->in_memory); |
| |
| if (object->source.open) |
| git_object__source_close(object); |
| |
| error = git_odb_read(&object->source.raw, object->repo->db, &object->id); |
| if (error < GIT_SUCCESS) |
| return error; |
| |
| object->source.open = 1; |
| return GIT_SUCCESS; |
| } |
| |
| void git_object__source_close(git_object *object) |
| { |
| assert(object); |
| |
| if (object->source.open) { |
| git_rawobj_close(&object->source.raw); |
| object->source.open = 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: |
| object = git__malloc(git_object__size(type)); |
| if (object == NULL) |
| return GIT_ENOMEM; |
| memset(object, 0x0, git_object__size(type)); |
| break; |
| |
| case GIT_OBJ_TREE: |
| object = (git_object *)git_tree__new(); |
| if (object == NULL) |
| return GIT_ENOMEM; |
| break; |
| |
| default: |
| return GIT_EINVALIDTYPE; |
| } |
| |
| *object_out = object; |
| return GIT_SUCCESS; |
| } |
| |
| int git_object_new(git_object **object_out, git_repository *repo, git_otype type) |
| { |
| git_object *object = NULL; |
| int error; |
| |
| assert(object_out && repo); |
| |
| if ((error = create_object(&object, type)) < GIT_SUCCESS) |
| return error; |
| |
| object->repo = repo; |
| object->in_memory = 1; |
| object->modified = 1; |
| |
| object->source.raw.type = type; |
| |
| object->lru = ++repo->lru_counter; |
| *object_out = object; |
| return GIT_SUCCESS; |
| } |
| |
| int git_object_lookup(git_object **object_out, git_repository *repo, const git_oid *id, git_otype type) |
| { |
| git_object *object = NULL; |
| git_rawobj obj_file; |
| int error = GIT_SUCCESS; |
| |
| assert(repo && object_out && id); |
| |
| object = git_hashtable_lookup(repo->objects, id); |
| if (object != NULL) { |
| if (type != GIT_OBJ_ANY && type != object->source.raw.type) |
| return GIT_EINVALIDTYPE; |
| |
| *object_out = object; |
| object->lru = ++repo->lru_counter; |
| object->can_free = 0; |
| return GIT_SUCCESS; |
| } |
| |
| error = git_odb_read(&obj_file, repo->db, id); |
| if (error < GIT_SUCCESS) |
| return error; |
| |
| if (type != GIT_OBJ_ANY && type != obj_file.type) { |
| git_rawobj_close(&obj_file); |
| return GIT_EINVALIDTYPE; |
| } |
| |
| type = obj_file.type; |
| |
| if ((error = create_object(&object, type)) < GIT_SUCCESS) |
| return error; |
| |
| /* Initialize parent object */ |
| git_oid_cpy(&object->id, id); |
| object->repo = repo; |
| memcpy(&object->source.raw, &obj_file, sizeof(git_rawobj)); |
| object->source.open = 1; |
| |
| switch (type) { |
| case GIT_OBJ_COMMIT: |
| error = git_commit__parse((git_commit *)object); |
| break; |
| |
| case GIT_OBJ_TREE: |
| error = git_tree__parse((git_tree *)object); |
| break; |
| |
| case GIT_OBJ_TAG: |
| error = git_tag__parse((git_tag *)object); |
| break; |
| |
| case GIT_OBJ_BLOB: |
| error = git_blob__parse((git_blob *)object); |
| break; |
| |
| default: |
| break; |
| } |
| |
| if (error < GIT_SUCCESS) { |
| git_object__free(object); |
| return error; |
| } |
| |
| git_object__source_close(object); |
| git_hashtable_insert(repo->objects, &object->id, object); |
| |
| object->lru = ++repo->lru_counter; |
| *object_out = object; |
| return GIT_SUCCESS; |
| } |
| |
| int git_object_write(git_object *object) |
| { |
| int error; |
| git_odb_source *source; |
| |
| assert(object); |
| |
| if (object->modified == 0) |
| return GIT_SUCCESS; |
| |
| prepare_write(object); |
| source = &object->source; |
| |
| switch (source->raw.type) { |
| case GIT_OBJ_COMMIT: |
| error = git_commit__writeback((git_commit *)object, source); |
| break; |
| |
| case GIT_OBJ_TREE: |
| error = git_tree__writeback((git_tree *)object, source); |
| break; |
| |
| case GIT_OBJ_TAG: |
| error = git_tag__writeback((git_tag *)object, source); |
| break; |
| |
| case GIT_OBJ_BLOB: |
| error = git_blob__writeback((git_blob *)object, source); |
| break; |
| |
| default: |
| error = GIT_ERROR; |
| break; |
| } |
| |
| if (error < GIT_SUCCESS) { |
| git_object__source_close(object); |
| return error; |
| } |
| |
| return write_back(object); |
| } |
| |
| void git_object__free(git_object *object) |
| { |
| assert(object); |
| |
| git_object__source_close(object); |
| |
| switch (object->source.raw.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: |
| free(object); |
| break; |
| } |
| } |
| |
| void git_object_close(git_object *object) |
| { |
| if (object == NULL) |
| return; |
| |
| if (object->in_memory) { |
| int idx = git_vector_search(&object->repo->memory_objects, object); |
| git_vector_remove(&object->repo->memory_objects, idx); |
| git_object__free(object); |
| } else { |
| object->can_free = 1; |
| } |
| } |
| |
| const git_oid *git_object_id(const git_object *obj) |
| { |
| assert(obj); |
| |
| if (obj->in_memory) |
| return NULL; |
| |
| return &obj->id; |
| } |
| |
| git_otype git_object_type(const git_object *obj) |
| { |
| assert(obj); |
| return obj->source.raw.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; |
| } |
| |