1 /*
2  * Copyright (c) 2018 Stefan Sperling <stsp@openbsd.org>
3  *
4  * Permission to use, copy, modify, and distribute this software for any
5  * purpose with or without fee is hereby granted, provided that the above
6  * copyright notice and this permission notice appear in all copies.
7  *
8  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15  */
16 
17 #include <sys/queue.h>
18 
19 #include <stdio.h>
20 #include <stdlib.h>
21 #include <string.h>
22 #include <zlib.h>
23 #include <sha1.h>
24 
25 #include "got_error.h"
26 #include "got_repository.h"
27 #include "got_object.h"
28 
29 #include "delta.h"
30 
31 struct got_delta *
32 got_delta_open(const char *path_packfile, int type, off_t offset,
33     size_t size)
34 {
35 	struct got_delta *delta;
36 
37 	delta = calloc(1, sizeof(*delta));
38 	if (delta == NULL)
39 		return NULL;
40 
41 	delta->path_packfile = strdup(path_packfile);
42 	if (delta->path_packfile == NULL) {
43 		free(delta);
44 		return NULL;
45 	}
46 	delta->type = type;
47 	delta->offset = offset;
48 	delta->size = size;
49 	return delta;
50 }
51 
52 void
53 got_delta_close(struct got_delta *delta)
54 {
55 	free(delta->path_packfile);
56 	free(delta);
57 
58 }
59 
60 const struct got_error *
61 got_delta_chain_get_base_type(int *type, struct got_delta_chain *deltas)
62 {
63 	struct got_delta *delta;
64 	int n = 0;
65 
66 	/* Find the last delta in the chain. It should be a plain object. */
67 	SIMPLEQ_FOREACH(delta, &deltas->entries, entry) {
68 		n++;
69 		if (delta->type == GOT_OBJ_TYPE_COMMIT ||
70 		    delta->type == GOT_OBJ_TYPE_TREE ||
71 		    delta->type == GOT_OBJ_TYPE_BLOB ||
72 		    delta->type == GOT_OBJ_TYPE_TAG) {
73 			if (n != deltas->nentries)
74 				return got_error(GOT_ERR_BAD_DELTA_CHAIN);
75 			*type = delta->type;
76 			return NULL;
77 		}
78 	}
79 
80 	return got_error(GOT_ERR_BAD_DELTA_CHAIN);
81 }
82 
83 const struct got_error *
84 got_delta_apply(struct got_repository *repo, FILE *infile, size_t size,
85     struct got_object *base_obj, FILE *outfile)
86 {
87 	return got_error(GOT_ERR_NOT_IMPL);
88 }