thodg/libgit2/src/odb_mempack.c

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• Hash : 0c7f49dd
  Author :
  Date : 2017-06-30T13:39:01
  

  Make sure to always include "common.h" first
  
  Next to including several files, our "common.h" header also declares
  various macros which are then used throughout the project. As such, we
  have to make sure to always include this file first in all
  implementation files. Otherwise, we might encounter problems or even
  silent behavioural differences due to macros or defines not being
  defined as they should be. So in fact, our header and implementation
  files should make sure to always include "common.h" first.
  
  This commit does so by establishing a common include pattern. Header
  files inside of "src" will now always include "common.h" as its first
  other file, separated by a newline from all the other includes to make
  it stand out as special. There are two cases for the implementation
  files. If they do have a matching header file, they will always include
  this one first, leading to "common.h" being transitively included as
  first file. If they do not have a matching header file, they instead
  include "common.h" as first file themselves.
  
  This fixes the outlined problems and will become our standard practice
  for header and source files inside of the "src/" from now on.
  

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• src/odb_mempack.c

• /*
   * 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.
   */
  
  #include "common.h"
  
  #include "git2/object.h"
  #include "git2/sys/odb_backend.h"
  #include "fileops.h"
  #include "hash.h"
  #include "odb.h"
  #include "array.h"
  #include "oidmap.h"
  
  #include "git2/odb_backend.h"
  #include "git2/types.h"
  #include "git2/pack.h"
  
  struct memobject {
  	git_oid oid;
  	size_t len;
  	git_otype type;
  	char data[GIT_FLEX_ARRAY];
  };
  
  struct memory_packer_db {
  	git_odb_backend parent;
  	git_oidmap *objects;
  	git_array_t(struct memobject *) commits;
  };
  
  static int impl__write(git_odb_backend *_backend, const git_oid *oid, const void *data, size_t len, git_otype type)
  {
  	struct memory_packer_db *db = (struct memory_packer_db *)_backend;
  	struct memobject *obj = NULL; 
  	khiter_t pos;
  	size_t alloc_len;
  	int rval;
  
  	pos = git_oidmap_put(db->objects, oid, &rval);
  	if (rval < 0)
  		return -1;
  
  	if (rval == 0)
  		return 0;
  
  	GITERR_CHECK_ALLOC_ADD(&alloc_len, sizeof(struct memobject), len);
  	obj = git__malloc(alloc_len);
  	GITERR_CHECK_ALLOC(obj);
  
  	memcpy(obj->data, data, len);
  	git_oid_cpy(&obj->oid, oid);
  	obj->len = len;
  	obj->type = type;
  
  	git_oidmap_set_key_at(db->objects, pos, &obj->oid);
  	git_oidmap_set_value_at(db->objects, pos, obj);
  
  	if (type == GIT_OBJ_COMMIT) {
  		struct memobject **store = git_array_alloc(db->commits);
  		GITERR_CHECK_ALLOC(store);
  		*store = obj;
  	}
  
  	return 0;
  }
  
  static int impl__exists(git_odb_backend *backend, const git_oid *oid)
  {
  	struct memory_packer_db *db = (struct memory_packer_db *)backend;
  
  	return git_oidmap_exists(db->objects, oid);
  }
  
  static int impl__read(void **buffer_p, size_t *len_p, git_otype *type_p, git_odb_backend *backend, const git_oid *oid)
  {
  	struct memory_packer_db *db = (struct memory_packer_db *)backend;
  	struct memobject *obj = NULL;
  	khiter_t pos;
  
  	pos = git_oidmap_lookup_index(db->objects, oid);
  	if (!git_oidmap_valid_index(db->objects, pos))
  		return GIT_ENOTFOUND;
  
  	obj = git_oidmap_value_at(db->objects, pos);
  
  	*len_p = obj->len;
  	*type_p = obj->type;
  	*buffer_p = git__malloc(obj->len);
  	GITERR_CHECK_ALLOC(*buffer_p);
  
  	memcpy(*buffer_p, obj->data, obj->len);
  	return 0;
  }
  
  static int impl__read_header(size_t *len_p, git_otype *type_p, git_odb_backend *backend, const git_oid *oid)
  {
  	struct memory_packer_db *db = (struct memory_packer_db *)backend;
  	struct memobject *obj = NULL;
  	khiter_t pos;
  
  	pos = git_oidmap_lookup_index(db->objects, oid);
  	if (!git_oidmap_valid_index(db->objects, pos))
  		return GIT_ENOTFOUND;
  
  	obj = git_oidmap_value_at(db->objects, pos);
  
  	*len_p = obj->len;
  	*type_p = obj->type;
  	return 0;
  }
  
  int git_mempack_dump(git_buf *pack, git_repository *repo, git_odb_backend *_backend)
  {
  	struct memory_packer_db *db = (struct memory_packer_db *)_backend;
  	git_packbuilder *packbuilder;
  	uint32_t i;
  	int err = -1;
  
  	if (git_packbuilder_new(&packbuilder, repo) < 0)
  		return -1;
  
  	for (i = 0; i < db->commits.size; ++i) {
  		struct memobject *commit = db->commits.ptr[i];
  
  		err = git_packbuilder_insert_commit(packbuilder, &commit->oid);
  		if (err < 0)
  			goto cleanup;
  	}
  
  	err = git_packbuilder_write_buf(pack, packbuilder);
  
  cleanup:
  	git_packbuilder_free(packbuilder);
  	return err;
  }
  
  void git_mempack_reset(git_odb_backend *_backend)
  {
  	struct memory_packer_db *db = (struct memory_packer_db *)_backend;
  	struct memobject *object = NULL;
  
  	git_oidmap_foreach_value(db->objects, object, {
  		git__free(object);
  	});
  
  	git_array_clear(db->commits);
  
  	git_oidmap_clear(db->objects);
  }
  
  static void impl__free(git_odb_backend *_backend)
  {
  	struct memory_packer_db *db = (struct memory_packer_db *)_backend;
  
  	git_oidmap_free(db->objects);
  	git__free(db);
  }
  
  int git_mempack_new(git_odb_backend **out)
  {
  	struct memory_packer_db *db;
  
  	assert(out);
  
  	db = git__calloc(1, sizeof(struct memory_packer_db));
  	GITERR_CHECK_ALLOC(db);
  
  	db->objects = git_oidmap_alloc();
  
  	db->parent.version = GIT_ODB_BACKEND_VERSION;
  	db->parent.read = &impl__read;
  	db->parent.write = &impl__write;
  	db->parent.read_header = &impl__read_header;
  	db->parent.exists = &impl__exists;
  	db->parent.free = &impl__free;
  
  	*out = (git_odb_backend *)db;
  	return 0;
  }
  

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