10 #include "tree-walk.h"
15 static int dry_run, quiet, recover, has_errors, strict;
16 static const char unpack_usage[] = "git-unpack-objects [-n] [-q] [-r] [--strict] < pack-file";
18 /* We always read in 4kB chunks. */
19 static unsigned char buffer[4096];
20 static unsigned int offset, len;
21 static off_t consumed_bytes;
29 static struct decoration obj_decorate;
31 static struct obj_buffer *lookup_object_buffer(struct object *base)
33 return lookup_decoration(&obj_decorate, base);
36 static void add_object_buffer(struct object *object, char *buffer, unsigned long size)
38 struct obj_buffer *obj;
39 obj = xcalloc(1, sizeof(struct obj_buffer));
42 if (add_decoration(&obj_decorate, object, obj))
43 die("object %s tried to add buffer twice!", sha1_to_hex(object->sha1));
47 * Make sure at least "min" bytes are available in the buffer, and
48 * return the pointer to the buffer.
50 static void *fill(int min)
53 return buffer + offset;
54 if (min > sizeof(buffer))
55 die("cannot fill %d bytes", min);
57 SHA1_Update(&ctx, buffer, offset);
58 memmove(buffer, buffer + offset, len);
62 ssize_t ret = xread(0, buffer + len, sizeof(buffer) - len);
66 die("read error on input: %s", strerror(errno));
73 static void use(int bytes)
76 die("used more bytes than were available");
80 /* make sure off_t is sufficiently large not to wrap */
81 if (consumed_bytes > consumed_bytes + bytes)
82 die("pack too large for current definition of off_t");
83 consumed_bytes += bytes;
86 static void *get_data(unsigned long size)
89 void *buf = xmalloc(size);
91 memset(&stream, 0, sizeof(stream));
93 stream.next_out = buf;
94 stream.avail_out = size;
95 stream.next_in = fill(1);
96 stream.avail_in = len;
100 int ret = inflate(&stream, 0);
101 use(len - stream.avail_in);
102 if (stream.total_out == size && ret == Z_STREAM_END)
105 error("inflate returned %d\n", ret);
113 stream.next_in = fill(1);
114 stream.avail_in = len;
121 unsigned char base_sha1[20];
126 struct delta_info *next;
129 static struct delta_info *delta_list;
131 static void add_delta_to_list(unsigned nr, unsigned const char *base_sha1,
133 void *delta, unsigned long size)
135 struct delta_info *info = xmalloc(sizeof(*info));
137 hashcpy(info->base_sha1, base_sha1);
138 info->base_offset = base_offset;
142 info->next = delta_list;
148 unsigned char sha1[20];
152 #define FLAG_OPEN (1u<<20)
153 #define FLAG_WRITTEN (1u<<21)
155 static struct obj_info *obj_list;
158 static void write_cached_object(struct object *obj)
160 unsigned char sha1[20];
161 struct obj_buffer *obj_buf = lookup_object_buffer(obj);
162 if (write_sha1_file(obj_buf->buffer, obj_buf->size, typename(obj->type), sha1) < 0)
163 die("failed to write object %s", sha1_to_hex(obj->sha1));
164 obj->flags |= FLAG_WRITTEN;
167 static int check_object(struct object *obj, int type, void *data)
172 if (obj->flags & FLAG_WRITTEN)
175 if (type != OBJ_ANY && obj->type != type)
176 die("object type mismatch");
178 if (!(obj->flags & FLAG_OPEN)) {
180 int type = sha1_object_info(obj->sha1, &size);
181 if (type != obj->type || type <= 0)
182 die("object of unexpected type");
183 obj->flags |= FLAG_WRITTEN;
187 if (fsck_object(obj, 1, fsck_error_function))
188 die("Error in object");
189 if (!fsck_walk(obj, check_object, 0))
190 die("Error on reachable objects of %s", sha1_to_hex(obj->sha1));
191 write_cached_object(obj);
195 static void write_rest(void)
198 for (i = 0; i < nr_objects; i++)
199 check_object(obj_list[i].obj, OBJ_ANY, 0);
202 static void added_object(unsigned nr, enum object_type type,
203 void *data, unsigned long size);
205 static void write_object(unsigned nr, enum object_type type,
206 void *buf, unsigned long size)
208 added_object(nr, type, buf, size);
210 if (write_sha1_file(buf, size, typename(type), obj_list[nr].sha1) < 0)
211 die("failed to write object");
213 obj_list[nr].obj = 0;
214 } else if (type == OBJ_BLOB) {
216 if (write_sha1_file(buf, size, typename(type), obj_list[nr].sha1) < 0)
217 die("failed to write object");
220 blob = lookup_blob(obj_list[nr].sha1);
222 blob->object.flags |= FLAG_WRITTEN;
224 die("invalid blob object");
225 obj_list[nr].obj = 0;
229 hash_sha1_file(buf, size, typename(type), obj_list[nr].sha1);
230 obj = parse_object_buffer(obj_list[nr].sha1, type, size, buf, &eaten);
232 die("invalid %s", typename(type));
233 /* buf is stored via add_object_buffer and in obj, if its a tree or commit */
234 add_object_buffer(obj, buf, size);
235 obj->flags |= FLAG_OPEN;
236 obj_list[nr].obj = obj;
240 static void resolve_delta(unsigned nr, enum object_type type,
241 void *base, unsigned long base_size,
242 void *delta, unsigned long delta_size)
245 unsigned long result_size;
247 result = patch_delta(base, base_size,
251 die("failed to apply delta");
253 write_object(nr, type, result, result_size);
256 static void added_object(unsigned nr, enum object_type type,
257 void *data, unsigned long size)
259 struct delta_info **p = &delta_list;
260 struct delta_info *info;
262 while ((info = *p) != NULL) {
263 if (!hashcmp(info->base_sha1, obj_list[nr].sha1) ||
264 info->base_offset == obj_list[nr].offset) {
267 resolve_delta(info->nr, type, data, size,
268 info->delta, info->size);
276 static void unpack_non_delta_entry(enum object_type type, unsigned long size,
279 void *buf = get_data(size);
282 write_object(nr, type, buf, size);
287 static void unpack_delta_entry(enum object_type type, unsigned long delta_size,
290 void *delta_data, *base;
291 unsigned long base_size;
292 unsigned char base_sha1[20];
295 if (type == OBJ_REF_DELTA) {
296 hashcpy(base_sha1, fill(20));
298 delta_data = get_data(delta_size);
299 if (dry_run || !delta_data) {
303 if (!has_sha1_file(base_sha1)) {
304 hashcpy(obj_list[nr].sha1, null_sha1);
305 add_delta_to_list(nr, base_sha1, 0, delta_data, delta_size);
309 unsigned base_found = 0;
310 unsigned char *pack, c;
312 unsigned lo, mid, hi;
317 base_offset = c & 127;
320 if (!base_offset || MSB(base_offset, 7))
321 die("offset value overflow for delta base object");
325 base_offset = (base_offset << 7) + (c & 127);
327 base_offset = obj_list[nr].offset - base_offset;
329 delta_data = get_data(delta_size);
330 if (dry_run || !delta_data) {
338 if (base_offset < obj_list[mid].offset) {
340 } else if (base_offset > obj_list[mid].offset) {
343 hashcpy(base_sha1, obj_list[mid].sha1);
344 base_found = !is_null_sha1(base_sha1);
349 /* The delta base object is itself a delta that
350 has not been resolved yet. */
351 hashcpy(obj_list[nr].sha1, null_sha1);
352 add_delta_to_list(nr, null_sha1, base_offset, delta_data, delta_size);
357 obj = lookup_object(base_sha1);
359 struct obj_buffer *obj_buf = lookup_object_buffer(obj);
361 resolve_delta(nr, obj->type, obj_buf->buffer, obj_buf->size, delta_data, delta_size);
366 base = read_sha1_file(base_sha1, &type, &base_size);
368 error("failed to read delta-pack base object %s",
369 sha1_to_hex(base_sha1));
375 resolve_delta(nr, type, base, base_size, delta_data, delta_size);
379 static void unpack_one(unsigned nr)
382 unsigned char *pack, c;
384 enum object_type type;
386 obj_list[nr].offset = consumed_bytes;
398 size += (c & 0x7f) << shift;
407 unpack_non_delta_entry(type, size, nr);
411 unpack_delta_entry(type, size, nr);
414 error("bad object type %d", type);
422 static void unpack_all(void)
425 struct progress *progress = NULL;
426 struct pack_header *hdr = fill(sizeof(struct pack_header));
428 nr_objects = ntohl(hdr->hdr_entries);
430 if (ntohl(hdr->hdr_signature) != PACK_SIGNATURE)
431 die("bad pack file");
432 if (!pack_version_ok(hdr->hdr_version))
433 die("unknown pack file version %d", ntohl(hdr->hdr_version));
434 use(sizeof(struct pack_header));
437 progress = start_progress("Unpacking objects", nr_objects);
438 obj_list = xmalloc(nr_objects * sizeof(*obj_list));
439 memset(obj_list, 0, nr_objects * sizeof(*obj_list));
440 for (i = 0; i < nr_objects; i++) {
442 display_progress(progress, i + 1);
444 stop_progress(&progress);
447 die("unresolved deltas left after unpacking");
450 int cmd_unpack_objects(int argc, const char **argv, const char *prefix)
453 unsigned char sha1[20];
455 git_config(git_default_config);
459 for (i = 1 ; i < argc; i++) {
460 const char *arg = argv[i];
463 if (!strcmp(arg, "-n")) {
467 if (!strcmp(arg, "-q")) {
471 if (!strcmp(arg, "-r")) {
475 if (!strcmp(arg, "--strict")) {
479 if (!prefixcmp(arg, "--pack_header=")) {
480 struct pack_header *hdr;
483 hdr = (struct pack_header *)buffer;
484 hdr->hdr_signature = htonl(PACK_SIGNATURE);
485 hdr->hdr_version = htonl(strtoul(arg + 14, &c, 10));
488 hdr->hdr_entries = htonl(strtoul(c + 1, &c, 10));
497 /* We don't take any non-flag arguments now.. Maybe some day */
502 SHA1_Update(&ctx, buffer, offset);
503 SHA1_Final(sha1, &ctx);
506 if (hashcmp(fill(20), sha1))
507 die("final sha1 did not match");
510 /* Write the last part of the buffer to stdout */
512 int ret = xwrite(1, buffer + offset, len);