thodg/libgit2/src/pack-objects.h

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• Hash : 04a36fef
  Author :
  Date : 2014-10-11T15:48:29
  

  pack-objects: fill a packbuilder from a walk
  
  Most use-cases for the object packer communicate in terms of commits
  which each side has. We already have an object to specify this
  relationship between commits, namely git_revwalk.
  
  By knowing which commits we want to pack and which the other side
  already has, we can perform similar optimisations to git, by marking
  each tree as interesting or uninteresting only once, and not sending
  those trees which we know the other side has.
  

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• src/pack-objects.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_pack_objects_h__
  #define INCLUDE_pack_objects_h__
  
  #include "common.h"
  
  #include "buffer.h"
  #include "hash.h"
  #include "oidmap.h"
  #include "netops.h"
  #include "zstream.h"
  #include "pool.h"
  
  #include "git2/oid.h"
  #include "git2/pack.h"
  
  #define GIT_PACK_WINDOW 10 /* number of objects to possibly delta against */
  #define GIT_PACK_DEPTH 50 /* max delta depth */
  #define GIT_PACK_DELTA_CACHE_SIZE (256 * 1024 * 1024)
  #define GIT_PACK_DELTA_CACHE_LIMIT 1000
  #define GIT_PACK_BIG_FILE_THRESHOLD (512 * 1024 * 1024)
  
  typedef struct git_pobject {
  	git_oid id;
  	git_otype type;
  	git_off_t offset;
  
  	size_t size;
  
  	unsigned int hash; /* name hint hash */
  
  	struct git_pobject *delta; /* delta base object */
  	struct git_pobject *delta_child; /* deltified objects who bases me */
  	struct git_pobject *delta_sibling; /* other deltified objects
  					    * who uses the same base as
  					    * me */
  
  	void *delta_data;
  	unsigned long delta_size;
  	unsigned long z_delta_size;
  
  	int written:1,
  	    recursing:1,
  	    tagged:1,
  	    filled:1;
  } git_pobject;
  
  typedef struct {
  	git_oid id;
  	unsigned int uninteresting:1,
  		seen:1;
  } git_walk_object;
  
  struct git_packbuilder {
  	git_repository *repo; /* associated repository */
  	git_odb *odb; /* associated object database */
  
  	git_hash_ctx ctx;
  	git_zstream zstream;
  
  	uint32_t nr_objects,
  		 nr_alloc,
  		 nr_written,
  		 nr_remaining;
  
  	git_pobject *object_list;
  
  	git_oidmap *object_ix;
  
  	git_oidmap *walk_objects;
  	git_pool object_pool;
  
  	git_oid pack_oid; /* hash of written pack */
  
  	/* synchronization objects */
  	git_mutex cache_mutex;
  	git_mutex progress_mutex;
  	git_cond progress_cond;
  
  	/* configs */
  	uint64_t delta_cache_size;
  	uint64_t max_delta_cache_size;
  	uint64_t cache_max_small_delta_size;
  	uint64_t big_file_threshold;
  	uint64_t window_memory_limit;
  
  	int nr_threads; /* nr of threads to use */
  
  	git_packbuilder_progress progress_cb;
  	void *progress_cb_payload;
  	double last_progress_report_time; /* the time progress was last reported */
  
  	bool done;
  };
  
  int git_packbuilder_write_buf(git_buf *buf, git_packbuilder *pb);
  
  #endif /* INCLUDE_pack_objects_h__ */
  

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