thodg/libgit2/src/diff_generate.h

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• Hash : 359240b6
  Author :
  Date : 2022-02-11T17:56:05
  

  diff: indicate when the file size is "valid" When we know the file size (because we're producing it from a working directory iterator, or an index with an up-to-date cache) then set a flag indicating as such. This removes the ambiguity about a 0 file size, which could indicate that a file exists and is 0 bytes, or that we haven't read it yet.

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• src/diff_generate.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_diff_generate_h__
  #define INCLUDE_diff_generate_h__
  
  #include "common.h"
  
  #include "diff.h"
  #include "pool.h"
  #include "index.h"
  
  enum {
  	GIT_DIFFCAPS_HAS_SYMLINKS     = (1 << 0), /* symlinks on platform? */
  	GIT_DIFFCAPS_IGNORE_STAT      = (1 << 1), /* use stat? */
  	GIT_DIFFCAPS_TRUST_MODE_BITS  = (1 << 2), /* use st_mode? */
  	GIT_DIFFCAPS_TRUST_CTIME      = (1 << 3), /* use st_ctime? */
  	GIT_DIFFCAPS_USE_DEV          = (1 << 4)  /* use st_dev? */
  };
  
  #define DIFF_FLAGS_KNOWN_BINARY (GIT_DIFF_FLAG_BINARY|GIT_DIFF_FLAG_NOT_BINARY)
  #define DIFF_FLAGS_NOT_BINARY   (GIT_DIFF_FLAG_NOT_BINARY|GIT_DIFF_FLAG__NO_DATA)
  
  enum {
  	GIT_DIFF_FLAG__FREE_PATH  = (1 << 7),  /* `path` is allocated memory */
  	GIT_DIFF_FLAG__FREE_DATA  = (1 << 8),  /* internal file data is allocated */
  	GIT_DIFF_FLAG__UNMAP_DATA = (1 << 9),  /* internal file data is mmap'ed */
  	GIT_DIFF_FLAG__NO_DATA    = (1 << 10), /* file data should not be loaded */
  	GIT_DIFF_FLAG__FREE_BLOB  = (1 << 11), /* release the blob when done */
  	GIT_DIFF_FLAG__LOADED     = (1 << 12), /* file data has been loaded */
  
  	GIT_DIFF_FLAG__TO_DELETE  = (1 << 16), /* delete entry during rename det. */
  	GIT_DIFF_FLAG__TO_SPLIT   = (1 << 17), /* split entry during rename det. */
  	GIT_DIFF_FLAG__IS_RENAME_TARGET = (1 << 18),
  	GIT_DIFF_FLAG__IS_RENAME_SOURCE = (1 << 19),
  	GIT_DIFF_FLAG__HAS_SELF_SIMILARITY = (1 << 20)
  };
  
  #define GIT_DIFF_FLAG__CLEAR_INTERNAL(F) (F) = ((F) & 0x00FFFF)
  
  #define GIT_DIFF__VERBOSE  (1 << 30)
  
  extern void git_diff_addref(git_diff *diff);
  
  extern bool git_diff_delta__should_skip(
  	const git_diff_options *opts, const git_diff_delta *delta);
  
  extern int git_diff__from_iterators(
  	git_diff **diff_ptr,
  	git_repository *repo,
  	git_iterator *old_iter,
  	git_iterator *new_iter,
  	const git_diff_options *opts);
  
  extern int git_diff__commit(
  	git_diff **diff, git_repository *repo, const git_commit *commit, const git_diff_options *opts);
  
  extern int git_diff__paired_foreach(
  	git_diff *idx2head,
  	git_diff *wd2idx,
  	int (*cb)(git_diff_delta *i2h, git_diff_delta *w2i, void *payload),
  	void *payload);
  
  /* Merge two `git_diff`s according to the callback given by `cb`. */
  
  typedef git_diff_delta *(*git_diff__merge_cb)(
  	const git_diff_delta *left,
  	const git_diff_delta *right,
  	git_pool *pool);
  
  extern int git_diff__merge(
  	git_diff *onto, const git_diff *from, git_diff__merge_cb cb);
  
  extern git_diff_delta *git_diff__merge_like_cgit(
  	const git_diff_delta *a,
  	const git_diff_delta *b,
  	git_pool *pool);
  
  /* Duplicate a `git_diff_delta` out of the `git_pool` */
  extern git_diff_delta *git_diff__delta_dup(
  	const git_diff_delta *d, git_pool *pool);
  
  extern int git_diff__oid_for_file(
  	git_oid *out,
  	git_diff *diff,
  	const char *path,
  	uint16_t mode,
  	git_object_size_t size);
  
  extern int git_diff__oid_for_entry(
  	git_oid *out,
  	git_diff *diff,
  	const git_index_entry *src,
  	uint16_t mode,
  	const git_oid *update_match);
  
  /*
   * Sometimes a git_diff_file will have a zero size; this attempts to
   * fill in the size without loading the blob if possible.  If that is
   * not possible, then it will return the git_odb_object that had to be
   * loaded and the caller can use it or dispose of it as needed.
   */
  GIT_INLINE(int) git_diff_file__resolve_zero_size(
  	git_diff_file *file, git_odb_object **odb_obj, git_repository *repo)
  {
  	int error;
  	git_odb *odb;
  	size_t len;
  	git_object_t type;
  
  	if ((error = git_repository_odb(&odb, repo)) < 0)
  		return error;
  
  	error = git_odb__read_header_or_object(
  		odb_obj, &len, &type, odb, &file->id);
  
  	git_odb_free(odb);
  
  	if (!error) {
  		file->size = (git_object_size_t)len;
  		file->flags |= GIT_DIFF_FLAG_VALID_SIZE;
  	}
  
  	return error;
  }
  
  #endif
  

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