thodg/libgit2/src/tree-cache.h

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• Hash : f0e693b1
  Author :
  Date : 2021-09-07T17:53:49
  

  str: introduce `git_str` for internal, `git_buf` is external libgit2 has two distinct requirements that were previously solved by `git_buf`. We require: 1. A general purpose string class that provides a number of utility APIs for manipulating data (eg, concatenating, truncating, etc). 2. A structure that we can use to return strings to callers that they can take ownership of. By using a single class (`git_buf`) for both of these purposes, we have confused the API to the point that refactorings are difficult and reasoning about correctness is also difficult. Move the utility class `git_buf` to be called `git_str`: this represents its general purpose, as an internal string buffer class. The name also is an homage to Junio Hamano ("gitstr"). The public API remains `git_buf`, and has a much smaller footprint. It is generally only used as an "out" param with strict requirements that follow the documentation. (Exceptions exist for some legacy APIs to avoid breaking callers unnecessarily.) Utility functions exist to convert a user-specified `git_buf` to a `git_str` so that we can call internal functions, then converting it back again.

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• src/tree-cache.h

• /*
   * Copyright (C) the libgit2 contributors. All rights reserved.
   *
   * This file is part of libgit2, distributed under the GNU GPL v2 with
   * a Linking Exception. For full terms see the included COPYING file.
   */
  
  #ifndef INCLUDE_tree_cache_h__
  #define INCLUDE_tree_cache_h__
  
  #include "common.h"
  
  #include "pool.h"
  #include "str.h"
  #include "git2/oid.h"
  
  typedef struct git_tree_cache {
  	struct git_tree_cache **children;
  	size_t children_count;
  
  	ssize_t entry_count;
  	git_oid oid;
  	size_t namelen;
  	char name[GIT_FLEX_ARRAY];
  } git_tree_cache;
  
  int git_tree_cache_write(git_str *out, git_tree_cache *tree);
  int git_tree_cache_read(git_tree_cache **tree, const char *buffer, size_t buffer_size, git_pool *pool);
  void git_tree_cache_invalidate_path(git_tree_cache *tree, const char *path);
  const git_tree_cache *git_tree_cache_get(const git_tree_cache *tree, const char *path);
  int git_tree_cache_new(git_tree_cache **out, const char *name, git_pool *pool);
  /**
   * Read a tree as the root of the tree cache (like for `git read-tree`)
   */
  int git_tree_cache_read_tree(git_tree_cache **out, const git_tree *tree, git_pool *pool);
  void git_tree_cache_free(git_tree_cache *tree);
  
  #endif
  

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