| 1 | #define USE_THE_REPOSITORY_VARIABLE |
| 2 | |
| 3 | #include "test-tool.h" |
| 4 | #include "git-compat-util.h" |
| 5 | #include "delta.h" |
| 6 | #include "git-zlib.h" |
| 7 | #include "hash.h" |
| 8 | #include "hex.h" |
| 9 | #include "pack.h" |
| 10 | #include "packfile.h" |
| 11 | #include "pack-objects.h" |
| 12 | #include "parse-options.h" |
| 13 | #include "setup.h" |
| 14 | #include "strbuf.h" |
| 15 | #include "string-list.h" |
| 16 | |
| 17 | static const char *usage_str[] = { |
| 18 | "test-tool pack-deltas --num-objects <num-objects>", |
| 19 | "test-tool pack-deltas --list-deltas <pack>.idx", |
| 20 | NULL |
| 21 | }; |
| 22 | |
| 23 | static unsigned long do_compress(void **pptr, unsigned long size) |
| 24 | { |
| 25 | git_zstream stream; |
| 26 | void *in, *out; |
| 27 | size_t maxsize; |
| 28 | |
| 29 | git_deflate_init(&stream, 1); |
| 30 | maxsize = git_deflate_bound(&stream, size); |
| 31 | |
| 32 | in = *pptr; |
| 33 | out = xmalloc(maxsize); |
| 34 | *pptr = out; |
| 35 | |
| 36 | stream.next_in = in; |
| 37 | stream.avail_in = size; |
| 38 | stream.next_out = out; |
| 39 | stream.avail_out = maxsize; |
| 40 | while (git_deflate(&stream, Z_FINISH) == Z_OK) |
| 41 | ; /* nothing */ |
| 42 | git_deflate_end(&stream); |
| 43 | |
| 44 | free(in); |
| 45 | return stream.total_out; |
| 46 | } |
| 47 | |
| 48 | static void write_ref_delta(struct hashfile *f, |
| 49 | struct object_id *oid, |
| 50 | struct object_id *base) |
| 51 | { |
| 52 | unsigned char header[MAX_PACK_OBJECT_HEADER]; |
| 53 | unsigned long delta_size, compressed_size, hdrlen; |
| 54 | size_t size, base_size, delta_size_st = 0; |
| 55 | enum object_type type; |
| 56 | void *base_buf, *delta_buf; |
| 57 | void *buf = odb_read_object(the_repository->objects, |
| 58 | oid, &type, &size); |
| 59 | |
| 60 | if (!buf) |
| 61 | die("unable to read %s", oid_to_hex(oid)); |
| 62 | |
| 63 | base_buf = odb_read_object(the_repository->objects, |
| 64 | base, &type, &base_size); |
| 65 | |
| 66 | if (!base_buf) |
| 67 | die("unable to read %s", oid_to_hex(base)); |
| 68 | |
| 69 | delta_buf = diff_delta(base_buf, base_size, |
| 70 | buf, size, &delta_size_st, 0); |
| 71 | delta_size = cast_size_t_to_ulong(delta_size_st); |
| 72 | |
| 73 | compressed_size = do_compress(&delta_buf, delta_size); |
| 74 | |
| 75 | hdrlen = encode_in_pack_object_header(header, sizeof(header), |
| 76 | OBJ_REF_DELTA, delta_size); |
| 77 | hashwrite(f, header, hdrlen); |
| 78 | hashwrite(f, base->hash, the_repository->hash_algo->rawsz); |
| 79 | hashwrite(f, delta_buf, compressed_size); |
| 80 | |
| 81 | free(buf); |
| 82 | free(base_buf); |
| 83 | free(delta_buf); |
| 84 | } |
| 85 | |
| 86 | static int list_delta(const struct object_id *oid, |
| 87 | struct packed_git *p, |
| 88 | uint32_t pos, |
| 89 | void *_w_curs) |
| 90 | { |
| 91 | struct pack_window **w_curs = _w_curs; |
| 92 | off_t obj_offset = nth_packed_object_offset(p, pos); |
| 93 | off_t cur = obj_offset; |
| 94 | size_t size; |
| 95 | enum object_type type = unpack_object_header(p, w_curs, &cur, |
| 96 | &size); |
| 97 | |
| 98 | if (type < 0) |
| 99 | die("unable to parse object at position %"PRIu32, pos); |
| 100 | if (type != OBJ_REF_DELTA && type != OBJ_OFS_DELTA) |
| 101 | return 0; |
| 102 | |
| 103 | if (type == OBJ_REF_DELTA) { |
| 104 | struct object_id base_oid; |
| 105 | const unsigned char *base = use_pack(p, w_curs, cur, |
| 106 | NULL); |
| 107 | |
| 108 | oidread(&base_oid, base, p->repo->hash_algo); |
| 109 | printf("%s REF_DELTA %s\n", oid_to_hex(oid), |
| 110 | oid_to_hex(&base_oid)); |
| 111 | } else { |
| 112 | off_t base_offset = get_delta_base(p, w_curs, &cur, |
| 113 | type, obj_offset); |
| 114 | |
| 115 | if (!base_offset) |
| 116 | die("unable to read base of object %s", oid_to_hex(oid)); |
| 117 | printf("%s OFS_DELTA %"PRIuMAX"\n", oid_to_hex(oid), |
| 118 | (uintmax_t)base_offset); |
| 119 | } |
| 120 | |
| 121 | return 0; |
| 122 | } |
| 123 | |
| 124 | static void list_deltas(const char *idx_name) |
| 125 | { |
| 126 | struct packed_git *p; |
| 127 | struct pack_window *w_curs = NULL; |
| 128 | |
| 129 | p = add_packed_git(the_repository, idx_name, strlen(idx_name), 1); |
| 130 | if (!p || open_pack_index(p)) |
| 131 | die("unable to open pack index %s", idx_name); |
| 132 | |
| 133 | if (for_each_object_in_pack(p, list_delta, &w_curs, |
| 134 | ODB_FOR_EACH_OBJECT_PACK_ORDER)) |
| 135 | die("unable to iterate over objects in %s", idx_name); |
| 136 | |
| 137 | unuse_pack(&w_curs); |
| 138 | close_pack(p); |
| 139 | free(p); |
| 140 | } |
| 141 | |
| 142 | int cmd__pack_deltas(int argc, const char **argv) |
| 143 | { |
| 144 | int num_objects = -1; |
| 145 | int list_deltas_mode = 0; |
| 146 | struct hashfile *f; |
| 147 | struct strbuf line = STRBUF_INIT; |
| 148 | struct option options[] = { |
| 149 | OPT_INTEGER('n', "num-objects", &num_objects, N_("the number of objects to write")), |
| 150 | OPT_BOOL(0, "list-deltas", &list_deltas_mode, |
| 151 | N_("list REF_DELTA and OFS_DELTA entries")), |
| 152 | OPT_END() |
| 153 | }; |
| 154 | |
| 155 | argc = parse_options(argc, argv, NULL, |
| 156 | options, usage_str, 0); |
| 157 | |
| 158 | if (list_deltas_mode) { |
| 159 | if (argc != 1 || num_objects >= 0) |
| 160 | usage_with_options(usage_str, options); |
| 161 | setup_git_directory(the_repository); |
| 162 | list_deltas(argv[0]); |
| 163 | return 0; |
| 164 | } |
| 165 | |
| 166 | if (argc || num_objects < 0) |
| 167 | usage_with_options(usage_str, options); |
| 168 | |
| 169 | setup_git_directory(the_repository); |
| 170 | |
| 171 | f = hashfd(the_repository->hash_algo, 1, "<stdout>"); |
| 172 | write_pack_header(f, num_objects); |
| 173 | |
| 174 | /* Read each line from stdin into 'line' */ |
| 175 | while (strbuf_getline_lf(&line, stdin) != EOF) { |
| 176 | const char *type_str, *content_oid_str, *base_oid_str = NULL; |
| 177 | struct object_id content_oid, base_oid; |
| 178 | struct string_list items = STRING_LIST_INIT_NODUP; |
| 179 | /* |
| 180 | * Tokenize into two or three parts: |
| 181 | * 1. REF_DELTA, OFS_DELTA, or FULL. |
| 182 | * 2. The object ID for the content object. |
| 183 | * 3. The object ID for the base object (optional). |
| 184 | */ |
| 185 | if (string_list_split_in_place(&items, line.buf, " ", 3) < 0) |
| 186 | die("invalid input format: %s", line.buf); |
| 187 | |
| 188 | if (items.nr < 2) |
| 189 | die("invalid input format: %s", line.buf); |
| 190 | |
| 191 | type_str = items.items[0].string; |
| 192 | content_oid_str = items.items[1].string; |
| 193 | |
| 194 | if (get_oid_hex(content_oid_str, &content_oid)) |
| 195 | die("invalid object: %s", content_oid_str); |
| 196 | if (items.nr >= 3) { |
| 197 | base_oid_str = items.items[2].string; |
| 198 | if (get_oid_hex(base_oid_str, &base_oid)) |
| 199 | die("invalid object: %s", base_oid_str); |
| 200 | } |
| 201 | string_list_clear(&items, 0); |
| 202 | |
| 203 | if (!strcmp(type_str, "REF_DELTA")) |
| 204 | write_ref_delta(f, &content_oid, &base_oid); |
| 205 | else if (!strcmp(type_str, "OFS_DELTA")) |
| 206 | die("OFS_DELTA not implemented"); |
| 207 | else if (!strcmp(type_str, "FULL")) |
| 208 | die("FULL not implemented"); |
| 209 | else |
| 210 | die("unknown pack type: %s", type_str); |
| 211 | } |
| 212 | |
| 213 | finalize_hashfile(f, NULL, FSYNC_COMPONENT_PACK, |
| 214 | CSUM_HASH_IN_STREAM | CSUM_FSYNC | CSUM_CLOSE); |
| 215 | strbuf_release(&line); |
| 216 | return 0; |
| 217 | } |