thodg/libgit2/src/offmap.h

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• Hash : c0f4a011
  Author :
  Date : 2012-12-19T16:48:12
  

  pack: introduce a delta base cache Many delta bases are re-used. Cache them to avoid inflating the same data repeatedly. This version doesn't limit the amount of entries to store, so it can end up using a considerable amound of memory.

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• src/offmap.h

• /*
   * Copyright (C) 2012 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_offmap_h__
  #define INCLUDE_offmap_h__
  
  #include "common.h"
  #include "git2/types.h"
  
  #define kmalloc git__malloc
  #define kcalloc git__calloc
  #define krealloc git__realloc
  #define kfree git__free
  #include "khash.h"
  
  __KHASH_TYPE(off, git_off_t, void *);
  typedef khash_t(off) git_offmap;
  
  #define GIT__USE_OFFMAP \
  	__KHASH_IMPL(off, static kh_inline, git_off_t, void *, 1, kh_int64_hash_func, kh_int64_hash_equal);
  
  #define git_offmap_alloc()  kh_init(off)
  #define git_offmap_free(h)  kh_destroy(off, h), h = NULL
  #define git_offmap_clear(h) kh_clear(off, h)
  
  #define git_offmap_num_entries(h) kh_size(h)
  
  #define git_offmap_lookup_index(h, k)  kh_get(off, h, k)
  #define git_offmap_valid_index(h, idx) (idx != kh_end(h))
  
  #define git_offmap_exists(h, k) (kh_get(off, h, k) != kh_end(h))
  
  #define git_offmap_value_at(h, idx)        kh_val(h, idx)
  #define git_offmap_set_value_at(h, idx, v) kh_val(h, idx) = v
  #define git_offmap_delete_at(h, idx)       kh_del(off, h, idx)
  
  #define git_offmap_insert(h, key, val, rval) do { \
  	khiter_t __pos = kh_put(off, h, key, &rval); \
  	if (rval >= 0) { \
  		if (rval == 0) kh_key(h, __pos) = key; \
  		kh_val(h, __pos) = val; \
  	} } while (0)
  
  #define git_offmap_insert2(h, key, val, oldv, rval) do { \
  	khiter_t __pos = kh_put(off, h, key, &rval); \
  	if (rval >= 0) { \
  		if (rval == 0) { \
  			oldv = kh_val(h, __pos); \
  			kh_key(h, __pos) = key; \
  		} else { oldv = NULL; } \
  		kh_val(h, __pos) = val; \
  	} } while (0)
  
  #define git_offmap_delete(h, key) do { \
  	khiter_t __pos = git_offmap_lookup_index(h, key); \
  	if (git_offmap_valid_index(h, __pos)) \
  		git_offmap_delete_at(h, __pos); } while (0)
  
  #define git_offmap_foreach		kh_foreach
  #define git_offmap_foreach_value	kh_foreach_value
  
  #endif
  

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