thodg/libgit2/src/pack.h

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• Hash : 87d9869f
  Author :
  Date : 2011-09-19T03:34:49
  

  Tabify everything There were quite a few places were spaces were being used instead of tabs. Try to catch them all. This should hopefully not break anything. Except for `git blame`. Oh well.

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• src/pack.h

• /*
   * Copyright (C) 2009-2011 the libgit2 contributors
   *
   * 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_pack_h__
  #define INCLUDE_pack_h__
  
  #include "git2/oid.h"
  
  #include "common.h"
  #include "map.h"
  #include "mwindow.h"
  #include "odb.h"
  
  #define PACK_SIGNATURE 0x5041434b	/* "PACK" */
  #define PACK_VERSION 2
  #define pack_version_ok(v) ((v) == htonl(2) || (v) == htonl(3))
  struct git_pack_header {
  	uint32_t hdr_signature;
  	uint32_t hdr_version;
  	uint32_t hdr_entries;
  };
  
  /*
   * The first four bytes of index formats later than version 1 should
   * start with this signature, as all older git binaries would find this
   * value illegal and abort reading the file.
   *
   * This is the case because the number of objects in a packfile
   * cannot exceed 1,431,660,000 as every object would need at least
   * 3 bytes of data and the overall packfile cannot exceed 4 GiB with
   * version 1 of the index file due to the offsets limited to 32 bits.
   * Clearly the signature exceeds this maximum.
   *
   * Very old git binaries will also compare the first 4 bytes to the
   * next 4 bytes in the index and abort with a "non-monotonic index"
   * error if the second 4 byte word is smaller than the first 4
   * byte word. This would be true in the proposed future index
   * format as idx_signature would be greater than idx_version.
   */
  
  #define PACK_IDX_SIGNATURE 0xff744f63	/* "\377tOc" */
  
  struct git_pack_idx_header {
  	uint32_t idx_signature;
  	uint32_t idx_version;
  };
  
  struct git_pack_file {
  	git_mwindow_file mwf;
  	git_map index_map;
  
  	uint32_t num_objects;
  	uint32_t num_bad_objects;
  	git_oid *bad_object_sha1; /* array of git_oid */
  
  	int index_version;
  	git_time_t mtime;
  	unsigned pack_local:1, pack_keep:1, has_cache:1;
  	git_oid sha1;
  	git_vector cache;
  
  	/* something like ".git/objects/pack/xxxxx.pack" */
  	char pack_name[GIT_FLEX_ARRAY]; /* more */
  };
  
  struct git_pack_entry {
  	off_t offset;
  	git_oid sha1;
  	struct git_pack_file *p;
  };
  
  int git_packfile_unpack_header(
  		size_t *size_p,
  		git_otype *type_p,
  		git_mwindow_file *mwf,
  		git_mwindow **w_curs,
  		off_t *curpos);
  
  int git_packfile_unpack(git_rawobj *obj, struct git_pack_file *p, off_t *obj_offset);
  
  off_t get_delta_base(struct git_pack_file *p, git_mwindow **w_curs,
  		off_t *curpos, git_otype type,
  		off_t delta_obj_offset);
  
  void packfile_free(struct git_pack_file *p);
  int git_packfile_check(struct git_pack_file **pack_out, const char *path);
  int git_pack_entry_find(
  		struct git_pack_entry *e,
  		struct git_pack_file *p,
  		const git_oid *short_oid,
  		unsigned int len);
  
  #endif
  

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