thodg/got/lib/got_lib_deltify.h

• Show log

  Commit

• Hash : 69aa0e90
  Author :
  Date : 2021-03-10T22:49:21
  

  substantial rewrite of deltify.c; operate on plain files only

Download

• lib/got_lib_deltify.h

• /*
   * Copyright (c) 2020 Ori Bernstein
   * Copyright (c) 2021 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.
   */
  
  struct got_delta_block {
  	off_t		len;
  	off_t		offset;
  	uint64_t	hash;
  };
  
  struct got_delta_table {
  	struct got_delta_block	*blocks;
  	int			nblocks;
  	int			nalloc;
  };
  
  struct got_delta_instruction {
  	int	copy;
  	off_t	offset;
  	off_t	len;
  };
  
  enum {
  	GOT_DELTIFY_MINCHUNK	= 128,
  	GOT_DELTIFY_MAXCHUNK	= 8192,
  	GOT_DELTIFY_SPLITMASK	= (1 << 8) - 1,
  	
  };
  
  const struct got_error *got_deltify_init(struct got_delta_table **dt, FILE *f,
      off_t fileoffset, off_t filesize);
  const struct got_error *got_deltify(struct got_delta_instruction **deltas,
      int *ndeltas, FILE *f, off_t fileoffset, off_t filesize,
      struct got_delta_table *dt, FILE *basefile, off_t basefile_size);
  void got_deltify_free(struct got_delta_table *dt);
  

Download