thodg/got/lib/delta.c

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• Hash : c3703302
  Author :
  Date : 2018-01-23T15:19:45
  

  model delta chains in a better way

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• lib/delta.c

• /*
   * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
   *
   * Permission to use, copy, modify, and distribute this software for any
   * purpose with or without fee is hereby granted, provided that the above
   * copyright notice and this permission notice appear in all copies.
   *
   * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
   * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
   * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
   * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
   * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
   * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
   */
  
  #include <sys/queue.h>
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <zlib.h>
  #include <sha1.h>
  
  #include "got_error.h"
  #include "got_repository.h"
  #include "got_object.h"
  
  #include "delta.h"
  
  struct got_delta *
  got_delta_open(const char *path_packfile, int type, off_t offset,
      size_t size)
  {
  	struct got_delta *delta;
  
  	delta = calloc(1, sizeof(*delta));
  	if (delta == NULL)
  		return NULL;
  
  	delta->path_packfile = strdup(path_packfile);
  	if (delta->path_packfile == NULL) {
  		free(delta);
  		return NULL;
  	}
  	delta->type = type;
  	delta->offset = offset;
  	delta->size = size;
  	return delta;
  }
  
  void
  got_delta_close(struct got_delta *delta)
  {
  	free(delta->path_packfile);
  	free(delta);
  
  }
  
  const struct got_error *
  got_delta_chain_get_base_type(int *type, struct got_delta_chain *deltas)
  {
  	struct got_delta *delta;
  	int n = 0;
  
  	/* Find the last delta in the chain. It should be a plain object. */
  	SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
  		n++;
  		if (delta->type == GOT_OBJ_TYPE_COMMIT ||
  		    delta->type == GOT_OBJ_TYPE_TREE ||
  		    delta->type == GOT_OBJ_TYPE_BLOB ||
  		    delta->type == GOT_OBJ_TYPE_TAG) {
  			if (n != deltas->nentries)
  				return got_error(GOT_ERR_BAD_DELTA_CHAIN);
  			*type = delta->type;
  			return NULL;
  		}
  	}
  
  	return got_error(GOT_ERR_BAD_DELTA_CHAIN);
  }
  
  const struct got_error *
  got_delta_apply(struct got_repository *repo, FILE *infile, size_t size,
      struct got_object *base_obj, FILE *outfile)
  {
  	return got_error(GOT_ERR_NOT_IMPL);
  }
  

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