thodg/libgit2/src/tree.c

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• Hash : d8603ed9
  Author :
  Date : 2010-07-10T16:51:15
  

  Add parsing of tree file contents. The basic information (pointed trees and blobs) of each tree object in a revision pool can now be parsed and queried. 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"
  
  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_revpool *pool, const git_oid *id)
  {
  	git_tree *tree = NULL;
  
  	if (pool == NULL)
  		return NULL;
  
  	tree = (git_tree *)git_revpool_table_lookup(pool->objects, id);
  	if (tree != NULL)
  		return tree;
  
  	tree = git__malloc(sizeof(git_tree));
  
  	if (tree == NULL)
  		return NULL;
  
  	memset(tree, 0x0, sizeof(git_tree));
  
  	/* Initialize parent object */
  	git_oid_cpy(&tree->object.id, id);
  	tree->object.pool = pool;
  	tree->object.type = GIT_OBJ_TREE;
  
  	git_revpool_table_insert(pool->objects, (git_revpool_object *)tree);
  
  	return tree;
  }
  
  
  git_tree *git_tree_parse(git_revpool *pool, const git_oid *id)
  {
  	git_tree *tree = NULL;
  
  	if ((tree = git_tree_lookup(pool, id)) == NULL)
  		return NULL;
  
  	if (git_tree__parse(tree) < 0)
  		goto error_cleanup;
  
  	return tree;
  
  error_cleanup:
  	/* FIXME: do not free; the tree is owned by the revpool */
  	free(tree);
  	return NULL;
  }
  
  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.pool->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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