thodg/libgit2/src/tree.c

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• Hash : 3315782c
  Author :
  Date : 2010-08-08T14:12:17
  

  Redesigned the walking/object lookup interface The old 'git_revpool' object has been removed and split into two distinct objects with separate functionality, in order to have separate methods for object management and object walking. * A new object 'git_repository' does the high-level management of a repository's objects (commits, trees, tags, etc) on top of a 'git_odb'. Eventually, it will also manage other repository attributes (e.g. tag resolution, references, etc). See: src/git/repository.h * A new external method 'git_repository_lookup(repo, oid, type)' has been added to the 'git_repository' API. All object lookups (git_XXX_lookup()) are now wrappers to this method, and duplicated code has been removed. The method does automatic type checking and returns a generic 'git_revpool_object' that can be cast to any specific object. See: src/git/repository.h * The external methods for object parsing of repository objects (git_XXX_parse()) have been removed. Loading objects from the repository is now managed through the 'lookup' functions. These objects are loaded with minimal information, and the relevant parsing is done automatically when the user requests any of the parsed attributes through accessor methods. An attribute has been added to 'git_repository' in order to force the parsing of all the repository objects immediately after lookup. See: src/git/commit.h See: src/git/tag.h See: src/git/tree.h * The previous walking functionality of the revpool is now found in 'git_revwalk', which does the actual revision walking on a repository; the attributes when walking through commits in a database have been decoupled from the actual commit objects. This increases performance when accessing commits during the walk and allows to have several 'git_revwalk' instances working at the same time on top of the same repository, without having to load commits in memory several times. See: src/git/revwalk.h * The old 'git_revpool_table' has been renamed to 'git_hashtable' and now works as a generic hashtable with support for any kind of object and custom hash functions. See: src/hashtable.h * All the relevant unit tests have been updated, renamed and grouped accordingly. Signed-off-by: Vicent Marti <tanoku@gmail.com>

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• src/tree.c

• /*
   * 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 "common.h"
  #include "commit.h"
  #include "revwalk.h"
  #include "tree.h"
  #include "git/repository.h"
  
  void git_tree__free(git_tree *tree)
  {
  	free(tree);
  }
  
  const git_oid *git_tree_id(git_tree *tree)
  {
  	return &tree->object.id;
  }
  
  git_tree *git_tree_lookup(git_repository *repo, const git_oid *id)
  {
  	return (git_tree *)git_repository_lookup(repo, id, GIT_OBJ_TREE);
  }
  
  int git_tree__parse(git_tree *tree)
  {
  	static const char tree_header[] = {'t', 'r', 'e', 'e', ' '};
  
  	int error = 0;
  	git_obj odb_object;
  	char *buffer, *buffer_end;
  
  	error = git_odb_read(&odb_object, tree->object.repo->db, &tree->object.id);
  	if (error < 0)
  		return error;
  
  	buffer = odb_object.data;
  	buffer_end = odb_object.data + odb_object.len;
  
  	if (memcmp(buffer, tree_header, 5) != 0)
  		return GIT_EOBJCORRUPTED;
  
  	buffer += 5;
  
  	tree->byte_size = strtol(buffer, &buffer, 10);
  
  	if (*buffer++ != 0)
  		return GIT_EOBJCORRUPTED;
  
  	while (buffer < buffer_end) {
  		git_tree_entry *entry;
  
  		entry = git__malloc(sizeof(git_tree_entry));
  		entry->next = tree->entries;
  
  		entry->attr = strtol(buffer, &buffer, 10);
  
  		if (*buffer++ != ' ') {
  			error = GIT_EOBJCORRUPTED;
  			break;
  		}
  
  		entry->filename = git__strdup(buffer);
  
  		if (entry->filename == NULL) {
  			error = GIT_EOBJCORRUPTED;
  			break;
  		}
  		buffer += strlen(entry->filename);
  
  		git_oid_mkraw(&entry->oid, (const unsigned char *)buffer);
  		buffer += GIT_OID_RAWSZ;
  
  		tree->entries = entry;
  	}
  
  	return error;
  }
  

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