thodg/libgit2/src/tag.c

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• Hash : a7a7ddbe
  Author :
  Date : 2010-09-18T19:16:04
  

  Add generic methods for object writeback git_repository_object has now several internal methods to write back the object information in the repository. - git_repository__dbo_prepare_write() Prepares the DBO object to be modified - git_repository__dbo_write() Writes new bytes to the DBO object - git_repository__dbo_writeback() Writes back the changes to the repository Signed-off-by: Vicent Marti <tanoku@gmail.com>

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• src/tag.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 "tag.h"
  #include "revwalk.h"
  #include "git/odb.h"
  #include "git/repository.h"
  
  void git_tag__free(git_tag *tag)
  {
  	free(tag->message);
  	free(tag->tag_name);
  	free(tag->tagger);
  	free(tag);
  }
  
  const git_oid *git_tag_id(git_tag *t)
  {
  	return &t->object.id;
  }
  
  const git_repository_object *git_tag_target(git_tag *t)
  {
  	return t->target;
  }
  
  git_otype git_tag_type(git_tag *t)
  {
  	return t->type;
  }
  
  const char *git_tag_name(git_tag *t)
  {
  	return t->tag_name;
  }
  
  const git_person *git_tag_tagger(git_tag *t)
  {
  	return t->tagger;
  }
  
  const char *git_tag_message(git_tag *t)
  {
  	return t->message;
  }
  
  static int parse_tag_buffer(git_tag *tag, char *buffer, const char *buffer_end)
  {
  	static const char *tag_types[] = {
  		NULL, "commit\n", "tree\n", "blob\n", "tag\n"
  	};
  
  	git_oid target_oid;
  	unsigned int i, text_len;
  	char *search;
  
  	if (git__parse_oid(&target_oid, &buffer, buffer_end, "object ") < 0)
  		return GIT_EOBJCORRUPTED;
  
  	if (buffer + 5 >= buffer_end)
  		return GIT_EOBJCORRUPTED;
  
  	if (memcmp(buffer, "type ", 5) != 0)
  		return GIT_EOBJCORRUPTED;
  	buffer += 5;
  
  	tag->type = GIT_OBJ_BAD;
  
  	for (i = 1; i < ARRAY_SIZE(tag_types); ++i) {
  		size_t type_length = strlen(tag_types[i]);
  
  		if (buffer + type_length >= buffer_end)
  			return GIT_EOBJCORRUPTED;
  
  		if (memcmp(buffer, tag_types[i], type_length) == 0) {
  			tag->type = i;
  			buffer += type_length;
  			break;
  		}
  	}
  
  	if (tag->type == GIT_OBJ_BAD)
  		return GIT_EOBJCORRUPTED;
  
  	/* Lookup the tagged object once we know its type */
  	tag->target = 
  		git_repository_lookup(tag->object.repo, &target_oid, tag->type);
  
  	/* FIXME: is the tag file really corrupted if the tagged object
  	 * cannot be found on the database? */
  	/* if (tag->target == NULL)
  		return GIT_EOBJCORRUPTED; */
  
  	if (buffer + 4 >= buffer_end)
  		return GIT_EOBJCORRUPTED;
  
  	if (memcmp(buffer, "tag ", 4) != 0)
  		return GIT_EOBJCORRUPTED;
  	buffer += 4;
  
  	search = memchr(buffer, '\n', buffer_end - buffer);
  	if (search == NULL)
  		return GIT_EOBJCORRUPTED;
  
  	text_len = search - buffer;
  
  	if (tag->tag_name != NULL)
  		free(tag->tag_name);
  
  	tag->tag_name = git__malloc(text_len + 1);
  	memcpy(tag->tag_name, buffer, text_len);
  	tag->tag_name[text_len] = '\0';
  
  	buffer = search + 1;
  
  	if (tag->tagger != NULL)
  		free(tag->tagger);
  
  	tag->tagger = git__malloc(sizeof(git_person));
  
  	if (git__parse_person(tag->tagger, &buffer, buffer_end, "tagger ") != 0)
  		return GIT_EOBJCORRUPTED;
  
  	text_len = buffer_end - buffer;
  
  	if (tag->message != NULL)
  		free(tag->message);
  
  	tag->message = git__malloc(text_len + 1);
  	memcpy(tag->message, buffer, text_len);
  	tag->message[text_len] = '\0';
  
  	return 0;
  }
  
  int git_tag__parse(git_tag *tag)
  {
  	int error = 0;
  
  	error = git_repository__dbo_open((git_repository_object *)tag);
  	if (error < 0)
  		return error;
  
  	error = parse_tag_buffer(tag, tag->object.dbo.data, tag->object.dbo.data + tag->object.dbo.len);
  
  	git_repository__dbo_close((git_repository_object *)tag);
  	return error;
  }
  
  git_tag *git_tag_lookup(git_repository *repo, const git_oid *id)
  {
  	return (git_tag *)git_repository_lookup(repo, id, GIT_OBJ_TAG);
  }
  

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