thodg/libgit2/src/diff.h

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• Hash : effdbeb3
  Author :
  Date : 2013-07-24T17:48:37
  

  Make rename detection file size fix better The previous fix for checking file sizes with rename detection always loads the blob. In this version, if the odb backend can get the object header without loading the whole thing into memory, then we'll just use that, so that we can eliminate possible rename sources & targets without loading them.

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• src/diff.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_h__
  #define INCLUDE_diff_h__
  
  #include "git2/diff.h"
  #include "git2/oid.h"
  
  #include <stdio.h>
  #include "vector.h"
  #include "buffer.h"
  #include "iterator.h"
  #include "repository.h"
  #include "pool.h"
  #include "odb.h"
  
  #define DIFF_OLD_PREFIX_DEFAULT "a/"
  #define DIFF_NEW_PREFIX_DEFAULT "b/"
  
  enum {
  	GIT_DIFFCAPS_HAS_SYMLINKS     = (1 << 0), /* symlinks on platform? */
  	GIT_DIFFCAPS_ASSUME_UNCHANGED = (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? */
  	GIT_DIFFCAPS_TRUST_NANOSECS   = (1 << 5), /* use stat time nanoseconds */
  };
  
  #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)
  
  struct git_diff_list {
  	git_refcount     rc;
  	git_repository   *repo;
  	git_diff_options opts;
  	git_vector       pathspec;
  	git_vector       deltas;    /* vector of git_diff_delta */
  	git_pool pool;
  	git_iterator_type_t old_src;
  	git_iterator_type_t new_src;
  	uint32_t diffcaps;
  
  	int (*strcomp)(const char *, const char *);
  	int (*strncomp)(const char *, const char *, size_t);
  	int (*pfxcomp)(const char *str, const char *pfx);
  	int (*entrycomp)(const void *a, const void *b);
  };
  
  extern void git_diff__cleanup_modes(
  	uint32_t diffcaps, uint32_t *omode, uint32_t *nmode);
  
  extern void git_diff_list_addref(git_diff_list *diff);
  
  extern int git_diff_delta__cmp(const void *a, const void *b);
  extern int git_diff_delta__casecmp(const void *a, const void *b);
  
  extern const char *git_diff_delta__path(const git_diff_delta *delta);
  
  extern bool git_diff_delta__should_skip(
  	const git_diff_options *opts, const git_diff_delta *delta);
  
  extern int git_diff__oid_for_file(
  	git_repository *, const char *, uint16_t, git_off_t, git_oid *);
  
  extern int git_diff__from_iterators(
  	git_diff_list **diff_ptr,
  	git_repository *repo,
  	git_iterator *old_iter,
  	git_iterator *new_iter,
  	const git_diff_options *opts);
  
  extern int git_diff__paired_foreach(
  	git_diff_list *idx2head,
  	git_diff_list *wd2idx,
  	int (*cb)(git_diff_delta *i2h, git_diff_delta *w2i, void *payload),
  	void *payload);
  
  extern int git_diff_find_similar__hashsig_for_file(
  	void **out, const git_diff_file *f, const char *path, void *p);
  
  extern int git_diff_find_similar__hashsig_for_buf(
  	void **out, const git_diff_file *f, const char *buf, size_t len, void *p);
  
  extern void git_diff_find_similar__hashsig_free(void *sig, void *payload);
  
  extern int git_diff_find_similar__calc_similarity(
  	int *score, void *siga, void *sigb, void *payload);
  
  /*
   * 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_otype type;
  
  	if ((error = git_repository_odb(&odb, repo)) < 0)
  		return error;
  
  	error = git_odb__read_header_or_object(
  		odb_obj, &len, &type, odb, &file->oid);
  
  	git_odb_free(odb);
  
  	if (!error)
  		file->size = (git_off_t)len;
  
  	return error;
  }
  
  #endif
  
  

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