2 * GIT - The information manager from hell
4 * Copyright (C) Linus Torvalds, 2005
6 * This handles basic git sha1 object files - packing, unpacking,
16 #if defined(__linux__) && (defined(__i386__) || defined(__PPC__))
17 #define O_NOATIME 01000000
23 static unsigned int sha1_file_open_flag = O_NOATIME;
25 static unsigned hexval(char c)
27 if (c >= '0' && c <= '9')
29 if (c >= 'a' && c <= 'f')
31 if (c >= 'A' && c <= 'F')
36 int get_sha1_hex(const char *hex, unsigned char *sha1)
39 for (i = 0; i < 20; i++) {
40 unsigned int val = (hexval(hex[0]) << 4) | hexval(hex[1]);
49 static int get_sha1_file(const char *path, unsigned char *result)
52 int fd = open(path, O_RDONLY);
57 len = read(fd, buffer, sizeof(buffer));
61 return get_sha1_hex(buffer, result);
64 static char *git_dir, *git_object_dir, *git_index_file, *git_refs_dir;
65 static void setup_git_env(void)
67 git_dir = gitenv(GIT_DIR_ENVIRONMENT);
69 git_dir = DEFAULT_GIT_DIR_ENVIRONMENT;
70 git_object_dir = gitenv(DB_ENVIRONMENT);
71 if (!git_object_dir) {
72 git_object_dir = xmalloc(strlen(git_dir) + 9);
73 sprintf(git_object_dir, "%s/objects", git_dir);
75 git_refs_dir = xmalloc(strlen(git_dir) + 6);
76 sprintf(git_refs_dir, "%s/refs", git_dir);
77 git_index_file = gitenv(INDEX_ENVIRONMENT);
78 if (!git_index_file) {
79 git_index_file = xmalloc(strlen(git_dir) + 7);
80 sprintf(git_index_file, "%s/index", git_dir);
84 char *get_object_directory(void)
88 return git_object_dir;
91 char *get_refs_directory(void)
98 char *get_index_file(void)
102 return git_index_file;
105 int get_sha1(const char *str, unsigned char *sha1)
107 static char pathname[PATH_MAX];
108 static const char *prefix[] = {
118 if (!get_sha1_hex(str, sha1))
123 for (p = prefix; *p; p++) {
124 snprintf(pathname, sizeof(pathname), "%s/%s/%s",
126 if (!get_sha1_file(pathname, sha1))
133 char * sha1_to_hex(const unsigned char *sha1)
135 static char buffer[50];
136 static const char hex[] = "0123456789abcdef";
140 for (i = 0; i < 20; i++) {
141 unsigned int val = *sha1++;
142 *buf++ = hex[val >> 4];
143 *buf++ = hex[val & 0xf];
148 static void fill_sha1_path(char *pathbuf, const unsigned char *sha1)
151 for (i = 0; i < 20; i++) {
152 static char hex[] = "0123456789abcdef";
153 unsigned int val = sha1[i];
154 char *pos = pathbuf + i*2 + (i > 0);
155 *pos++ = hex[val >> 4];
156 *pos = hex[val & 0xf];
161 * NOTE! This returns a statically allocated buffer, so you have to be
162 * careful about using it. Do a "strdup()" if you need to save the
165 * Also note that this returns the location for creating. Reading
166 * SHA1 file can happen from any alternate directory listed in the
167 * DB_ENVIRONMENT environment variable if it is not found in
168 * the primary object database.
170 char *sha1_file_name(const unsigned char *sha1)
172 static char *name, *base;
175 const char *sha1_file_directory = get_object_directory();
176 int len = strlen(sha1_file_directory);
177 base = xmalloc(len + 60);
178 memcpy(base, sha1_file_directory, len);
179 memset(base+len, 0, 60);
182 name = base + len + 1;
184 fill_sha1_path(name, sha1);
188 struct alternate_object_database *alt_odb;
191 * Prepare alternate object database registry.
192 * alt_odb points at an array of struct alternate_object_database.
193 * This array is terminated with an element that has both its base
194 * and name set to NULL. alt_odb[n] comes from n'th non-empty
195 * element from colon separated ALTERNATE_DB_ENVIRONMENT environment
196 * variable, and its base points at a statically allocated buffer
197 * that contains "/the/directory/corresponding/to/.git/objects/...",
198 * while its name points just after the slash at the end of
199 * ".git/objects/" in the example above, and has enough space to hold
200 * 40-byte hex SHA1, an extra slash for the first level indirection,
201 * and the terminating NUL.
202 * This function allocates the alt_odb array and all the strings
203 * pointed by base fields of the array elements with one xmalloc();
204 * the string pool immediately follows the array.
206 void prepare_alt_odb(void)
209 const char *cp, *last;
211 const char *alt = gitenv(ALTERNATE_DB_ENVIRONMENT) ? : "";
215 /* The first pass counts how large an area to allocate to
216 * hold the entire alt_odb structure, including array of
217 * structs and path buffers for them. The second pass fills
218 * the structure and prepares the path buffers for use by
221 for (totlen = pass = 0; pass < 2; pass++) {
225 cp = strchr(last, ':') ? : last + strlen(last);
227 /* 43 = 40-byte + 2 '/' + terminating NUL */
228 int pfxlen = cp - last;
229 int entlen = pfxlen + 43;
233 alt_odb[i].base = op;
234 alt_odb[i].name = op + pfxlen + 1;
235 memcpy(op, last, pfxlen);
236 op[pfxlen] = op[pfxlen + 3] = '/';
242 while (*cp && *cp == ':')
248 alt_odb = xmalloc(sizeof(*alt_odb) * (i + 1) + totlen);
249 alt_odb[i].base = alt_odb[i].name = NULL;
250 op = (char*)(&alt_odb[i+1]);
254 static char *find_sha1_file(const unsigned char *sha1, struct stat *st)
257 char *name = sha1_file_name(sha1);
262 for (i = 0; (name = alt_odb[i].name) != NULL; i++) {
263 fill_sha1_path(name, sha1);
264 if (!stat(alt_odb[i].base, st))
265 return alt_odb[i].base;
270 #define PACK_MAX_SZ (1<<26)
271 static int pack_used_ctr;
272 static unsigned long pack_mapped;
273 struct packed_git *packed_git;
275 static int check_packed_git_idx(const char *path, unsigned long *idx_size_,
280 unsigned long idx_size;
282 int fd = open(path, O_RDONLY);
286 if (fstat(fd, &st)) {
290 idx_size = st.st_size;
291 idx_map = mmap(NULL, idx_size, PROT_READ, MAP_PRIVATE, fd, 0);
293 if (idx_map == MAP_FAILED)
298 *idx_size_ = idx_size;
300 /* check index map */
301 if (idx_size < 4*256 + 20 + 20)
302 return error("index file too small");
304 for (i = 0; i < 256; i++) {
305 unsigned int n = ntohl(index[i]);
307 return error("non-monotonic index");
313 * - 256 index entries 4 bytes each
314 * - 24-byte entries * nr (20-byte sha1 + 4-byte offset)
315 * - 20-byte SHA1 of the packfile
316 * - 20-byte SHA1 file checksum
318 if (idx_size != 4*256 + nr * 24 + 20 + 20)
319 return error("wrong index file size");
324 static int unuse_one_packed_git(void)
326 struct packed_git *p, *lru = NULL;
328 for (p = packed_git; p; p = p->next) {
329 if (p->pack_use_cnt || !p->pack_base)
331 if (!lru || p->pack_last_used < lru->pack_last_used)
336 munmap(lru->pack_base, lru->pack_size);
337 lru->pack_base = NULL;
341 void unuse_packed_git(struct packed_git *p)
346 int use_packed_git(struct packed_git *p)
353 pack_mapped += p->pack_size;
354 while (PACK_MAX_SZ < pack_mapped && unuse_one_packed_git())
356 fd = open(p->pack_name, O_RDONLY);
358 die("packfile %s cannot be opened", p->pack_name);
359 if (fstat(fd, &st)) {
361 die("packfile %s cannot be opened", p->pack_name);
363 if (st.st_size != p->pack_size)
364 die("packfile %s size mismatch.", p->pack_name);
365 map = mmap(NULL, p->pack_size, PROT_READ, MAP_PRIVATE, fd, 0);
367 if (map == MAP_FAILED)
368 die("packfile %s cannot be mapped.", p->pack_name);
371 /* Check if the pack file matches with the index file.
374 if (memcmp((char*)(p->index_base) + p->index_size - 40,
375 p->pack_base + p->pack_size - 20, 20))
376 die("packfile %s does not match index.", p->pack_name);
378 p->pack_last_used = pack_used_ctr++;
383 struct packed_git *add_packed_git(char *path, int path_len)
386 struct packed_git *p;
387 unsigned long idx_size;
390 if (check_packed_git_idx(path, &idx_size, &idx_map))
393 /* do we have a corresponding .pack file? */
394 strcpy(path + path_len - 4, ".pack");
395 if (stat(path, &st) || !S_ISREG(st.st_mode)) {
396 munmap(idx_map, idx_size);
399 /* ok, it looks sane as far as we can check without
400 * actually mapping the pack file.
402 p = xmalloc(sizeof(*p) + path_len + 2);
403 strcpy(p->pack_name, path);
404 p->index_size = idx_size;
405 p->pack_size = st.st_size;
406 p->index_base = idx_map;
409 p->pack_last_used = 0;
414 static void prepare_packed_git_one(char *objdir)
421 sprintf(path, "%s/pack", objdir);
427 while ((de = readdir(dir)) != NULL) {
428 int namelen = strlen(de->d_name);
429 struct packed_git *p;
431 if (strcmp(de->d_name + namelen - 4, ".idx"))
434 /* we have .idx. Is it a file we can map? */
435 strcpy(path + len, de->d_name);
436 p = add_packed_git(path, len + namelen);
439 p->next = packed_git;
444 void prepare_packed_git(void)
447 static int run_once = 0;
452 prepare_packed_git_one(get_object_directory());
454 for (i = 0; alt_odb[i].base != NULL; i++) {
455 alt_odb[i].name[0] = 0;
456 prepare_packed_git_one(alt_odb[i].base);
460 int check_sha1_signature(const unsigned char *sha1, void *map, unsigned long size, const char *type)
463 unsigned char real_sha1[20];
467 SHA1_Update(&c, header, 1+sprintf(header, "%s %lu", type, size));
468 SHA1_Update(&c, map, size);
469 SHA1_Final(real_sha1, &c);
470 return memcmp(sha1, real_sha1, 20) ? -1 : 0;
473 static void *map_sha1_file_internal(const unsigned char *sha1,
480 char *filename = find_sha1_file(sha1, &st);
484 error("cannot map sha1 file %s", sha1_to_hex(sha1));
488 fd = open(filename, O_RDONLY | sha1_file_open_flag);
490 /* See if it works without O_NOATIME */
491 switch (sha1_file_open_flag) {
493 fd = open(filename, O_RDONLY);
503 /* If it failed once, it will probably fail again.
504 * Stop using O_NOATIME
506 sha1_file_open_flag = 0;
508 map = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fd, 0);
510 if (-1 == (int)(long)map)
516 void *map_sha1_file(const unsigned char *sha1, unsigned long *size)
518 return map_sha1_file_internal(sha1, size, 1);
521 int unpack_sha1_header(z_stream *stream, void *map, unsigned long mapsize, void *buffer, unsigned long size)
523 /* Get the data stream */
524 memset(stream, 0, sizeof(*stream));
525 stream->next_in = map;
526 stream->avail_in = mapsize;
527 stream->next_out = buffer;
528 stream->avail_out = size;
531 return inflate(stream, 0);
534 static void *unpack_sha1_rest(z_stream *stream, void *buffer, unsigned long size)
536 int bytes = strlen(buffer) + 1;
537 unsigned char *buf = xmalloc(1+size);
539 memcpy(buf, buffer + bytes, stream->total_out - bytes);
540 bytes = stream->total_out - bytes;
542 stream->next_out = buf + bytes;
543 stream->avail_out = size - bytes;
544 while (inflate(stream, Z_FINISH) == Z_OK)
553 * We used to just use "sscanf()", but that's actually way
554 * too permissive for what we want to check. So do an anal
555 * object header parse by hand.
557 int parse_sha1_header(char *hdr, char *type, unsigned long *sizep)
563 * The type can be at most ten bytes (including the
564 * terminating '\0' that we add), and is followed by
579 * The length must follow immediately, and be in canonical
580 * decimal format (ie "010" is not valid).
587 unsigned long c = *hdr - '0';
591 size = size * 10 + c;
597 * The length must be followed by a zero byte
599 return *hdr ? -1 : 0;
602 void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size)
608 ret = unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr));
609 if (ret < Z_OK || parse_sha1_header(hdr, type, size) < 0)
612 return unpack_sha1_rest(&stream, hdr, *size);
615 /* forward declaration for a mutually recursive function */
616 static int packed_object_info(struct pack_entry *entry,
617 char *type, unsigned long *sizep);
619 static int packed_delta_info(unsigned char *base_sha1,
620 unsigned long delta_size,
623 unsigned long *sizep,
624 struct packed_git *p)
626 struct pack_entry base_ent;
629 die("truncated pack file");
631 /* The base entry _must_ be in the same pack */
632 if (!find_pack_entry_one(base_sha1, &base_ent, p))
633 die("failed to find delta-pack base object %s",
634 sha1_to_hex(base_sha1));
636 /* We choose to only get the type of the base object and
637 * ignore potentially corrupt pack file that expects the delta
638 * based on a base with a wrong size. This saves tons of
642 if (packed_object_info(&base_ent, type, NULL))
643 die("cannot get info for delta-pack base");
646 const unsigned char *data;
647 unsigned char delta_head[64];
648 unsigned long result_size;
652 memset(&stream, 0, sizeof(stream));
654 data = stream.next_in = base_sha1 + 20;
655 stream.avail_in = left - 20;
656 stream.next_out = delta_head;
657 stream.avail_out = sizeof(delta_head);
659 inflateInit(&stream);
660 st = inflate(&stream, Z_FINISH);
662 if ((st != Z_STREAM_END) &&
663 stream.total_out != sizeof(delta_head))
664 die("delta data unpack-initial failed");
666 /* Examine the initial part of the delta to figure out
670 get_delta_hdr_size(&data); /* ignore base size */
672 /* Read the result size */
673 result_size = get_delta_hdr_size(&data);
674 *sizep = result_size;
679 static unsigned long unpack_object_header(struct packed_git *p, unsigned long offset,
680 enum object_type *type, unsigned long *sizep)
683 unsigned char *pack, c;
686 if (offset >= p->pack_size)
687 die("object offset outside of pack file");
689 pack = p->pack_base + offset;
692 *type = (c >> 4) & 7;
696 if (offset >= p->pack_size)
697 die("object offset outside of pack file");
700 size += (c & 0x7f) << shift;
707 void packed_object_info_detail(struct pack_entry *e,
710 unsigned long *store_size,
711 int *delta_chain_length,
712 unsigned char *base_sha1)
714 struct packed_git *p = e->p;
715 unsigned long offset, left;
717 enum object_type kind;
719 offset = unpack_object_header(p, e->offset, &kind, size);
720 pack = p->pack_base + offset;
721 left = p->pack_size - offset;
722 if (kind != OBJ_DELTA)
723 *delta_chain_length = 0;
725 int chain_length = 0;
726 memcpy(base_sha1, pack, 20);
728 struct pack_entry base_ent;
731 find_pack_entry_one(pack, &base_ent, p);
732 offset = unpack_object_header(p, base_ent.offset,
734 pack = p->pack_base + offset;
736 } while (kind == OBJ_DELTA);
737 *delta_chain_length = chain_length;
741 strcpy(type, "commit");
744 strcpy(type, "tree");
747 strcpy(type, "blob");
753 die("corrupted pack file");
755 *store_size = 0; /* notyet */
758 static int packed_object_info(struct pack_entry *entry,
759 char *type, unsigned long *sizep)
761 struct packed_git *p = entry->p;
762 unsigned long offset, size, left;
764 enum object_type kind;
767 if (use_packed_git(p))
768 die("cannot map packed file");
770 offset = unpack_object_header(p, entry->offset, &kind, &size);
771 pack = p->pack_base + offset;
772 left = p->pack_size - offset;
776 retval = packed_delta_info(pack, size, left, type, sizep, p);
780 strcpy(type, "commit");
783 strcpy(type, "tree");
786 strcpy(type, "blob");
792 die("corrupted pack file");
800 /* forward declaration for a mutually recursive function */
801 static void *unpack_entry(struct pack_entry *, char *, unsigned long *);
803 static void *unpack_delta_entry(unsigned char *base_sha1,
804 unsigned long delta_size,
807 unsigned long *sizep,
808 struct packed_git *p)
810 struct pack_entry base_ent;
811 void *data, *delta_data, *result, *base;
812 unsigned long data_size, result_size, base_size;
817 die("truncated pack file");
818 data = base_sha1 + 20;
819 data_size = left - 20;
820 delta_data = xmalloc(delta_size);
822 memset(&stream, 0, sizeof(stream));
824 stream.next_in = data;
825 stream.avail_in = data_size;
826 stream.next_out = delta_data;
827 stream.avail_out = delta_size;
829 inflateInit(&stream);
830 st = inflate(&stream, Z_FINISH);
832 if ((st != Z_STREAM_END) || stream.total_out != delta_size)
833 die("delta data unpack failed");
835 /* The base entry _must_ be in the same pack */
836 if (!find_pack_entry_one(base_sha1, &base_ent, p))
837 die("failed to find delta-pack base object %s",
838 sha1_to_hex(base_sha1));
839 base = unpack_entry_gently(&base_ent, type, &base_size);
841 die("failed to read delta-pack base object %s",
842 sha1_to_hex(base_sha1));
843 result = patch_delta(base, base_size,
844 delta_data, delta_size,
847 die("failed to apply delta");
850 *sizep = result_size;
854 static void *unpack_non_delta_entry(unsigned char *data,
860 unsigned char *buffer;
862 buffer = xmalloc(size + 1);
864 memset(&stream, 0, sizeof(stream));
865 stream.next_in = data;
866 stream.avail_in = left;
867 stream.next_out = buffer;
868 stream.avail_out = size;
870 inflateInit(&stream);
871 st = inflate(&stream, Z_FINISH);
873 if ((st != Z_STREAM_END) || stream.total_out != size) {
881 static void *unpack_entry(struct pack_entry *entry,
882 char *type, unsigned long *sizep)
884 struct packed_git *p = entry->p;
887 if (use_packed_git(p))
888 die("cannot map packed file");
889 retval = unpack_entry_gently(entry, type, sizep);
892 die("corrupted pack file");
896 /* The caller is responsible for use_packed_git()/unuse_packed_git() pair */
897 void *unpack_entry_gently(struct pack_entry *entry,
898 char *type, unsigned long *sizep)
900 struct packed_git *p = entry->p;
901 unsigned long offset, size, left;
903 enum object_type kind;
906 offset = unpack_object_header(p, entry->offset, &kind, &size);
907 pack = p->pack_base + offset;
908 left = p->pack_size - offset;
911 retval = unpack_delta_entry(pack, size, left, type, sizep, p);
914 strcpy(type, "commit");
917 strcpy(type, "tree");
920 strcpy(type, "blob");
929 retval = unpack_non_delta_entry(pack, size, left);
933 int num_packed_objects(const struct packed_git *p)
935 /* See check_packed_git_idx() */
936 return (p->index_size - 20 - 20 - 4*256) / 24;
939 int nth_packed_object_sha1(const struct packed_git *p, int n,
942 void *index = p->index_base + 256;
943 if (n < 0 || num_packed_objects(p) <= n)
945 memcpy(sha1, (index + 24 * n + 4), 20);
949 int find_pack_entry_one(const unsigned char *sha1,
950 struct pack_entry *e, struct packed_git *p)
952 unsigned int *level1_ofs = p->index_base;
953 int hi = ntohl(level1_ofs[*sha1]);
954 int lo = ((*sha1 == 0x0) ? 0 : ntohl(level1_ofs[*sha1 - 1]));
955 void *index = p->index_base + 256;
958 int mi = (lo + hi) / 2;
959 int cmp = memcmp(index + 24 * mi + 4, sha1, 20);
961 e->offset = ntohl(*((int*)(index + 24 * mi)));
962 memcpy(e->sha1, sha1, 20);
974 static int find_pack_entry(const unsigned char *sha1, struct pack_entry *e)
976 struct packed_git *p;
977 prepare_packed_git();
979 for (p = packed_git; p; p = p->next) {
980 if (find_pack_entry_one(sha1, e, p))
986 int sha1_object_info(const unsigned char *sha1, char *type, unsigned long *sizep)
989 unsigned long mapsize, size;
994 map = map_sha1_file_internal(sha1, &mapsize, 0);
998 if (!find_pack_entry(sha1, &e))
999 return error("unable to find %s", sha1_to_hex(sha1));
1000 return packed_object_info(&e, type, sizep);
1002 if (unpack_sha1_header(&stream, map, mapsize, hdr, sizeof(hdr)) < 0)
1003 status = error("unable to unpack %s header",
1005 if (parse_sha1_header(hdr, type, &size) < 0)
1006 status = error("unable to parse %s header", sha1_to_hex(sha1));
1012 inflateEnd(&stream);
1013 munmap(map, mapsize);
1017 static void *read_packed_sha1(const unsigned char *sha1, char *type, unsigned long *size)
1019 struct pack_entry e;
1021 if (!find_pack_entry(sha1, &e)) {
1022 error("cannot read sha1_file for %s", sha1_to_hex(sha1));
1025 return unpack_entry(&e, type, size);
1028 void * read_sha1_file(const unsigned char *sha1, char *type, unsigned long *size)
1030 unsigned long mapsize;
1033 map = map_sha1_file_internal(sha1, &mapsize, 0);
1035 buf = unpack_sha1_file(map, mapsize, type, size);
1036 munmap(map, mapsize);
1039 return read_packed_sha1(sha1, type, size);
1042 void *read_object_with_reference(const unsigned char *sha1,
1043 const char *required_type,
1044 unsigned long *size,
1045 unsigned char *actual_sha1_return)
1049 unsigned long isize;
1050 unsigned char actual_sha1[20];
1052 memcpy(actual_sha1, sha1, 20);
1054 int ref_length = -1;
1055 const char *ref_type = NULL;
1057 buffer = read_sha1_file(actual_sha1, type, &isize);
1060 if (!strcmp(type, required_type)) {
1062 if (actual_sha1_return)
1063 memcpy(actual_sha1_return, actual_sha1, 20);
1066 /* Handle references */
1067 else if (!strcmp(type, "commit"))
1069 else if (!strcmp(type, "tag"))
1070 ref_type = "object ";
1075 ref_length = strlen(ref_type);
1077 if (memcmp(buffer, ref_type, ref_length) ||
1078 get_sha1_hex(buffer + ref_length, actual_sha1)) {
1082 /* Now we have the ID of the referred-to object in
1083 * actual_sha1. Check again. */
1087 static char *write_sha1_file_prepare(void *buf,
1090 unsigned char *sha1,
1096 /* Generate the header */
1097 *hdrlen = sprintf((char *)hdr, "%s %lu", type, len)+1;
1101 SHA1_Update(&c, hdr, *hdrlen);
1102 SHA1_Update(&c, buf, len);
1103 SHA1_Final(sha1, &c);
1105 return sha1_file_name(sha1);
1108 int write_sha1_file(void *buf, unsigned long len, const char *type, unsigned char *returnsha1)
1111 unsigned char *compressed;
1113 unsigned char sha1[20];
1115 static char tmpfile[PATH_MAX];
1116 unsigned char hdr[50];
1117 int fd, hdrlen, ret;
1119 /* Normally if we have it in the pack then we do not bother writing
1120 * it out into .git/objects/??/?{38} file.
1122 filename = write_sha1_file_prepare(buf, len, type, sha1, hdr, &hdrlen);
1124 memcpy(returnsha1, sha1, 20);
1125 if (has_sha1_file(sha1))
1127 fd = open(filename, O_RDONLY);
1130 * FIXME!!! We might do collision checking here, but we'd
1131 * need to uncompress the old file and check it. Later.
1137 if (errno != ENOENT) {
1138 fprintf(stderr, "sha1 file %s: %s", filename, strerror(errno));
1142 snprintf(tmpfile, sizeof(tmpfile), "%s/obj_XXXXXX", get_object_directory());
1144 fd = mkstemp(tmpfile);
1146 fprintf(stderr, "unable to create temporary sha1 filename %s: %s", tmpfile, strerror(errno));
1151 memset(&stream, 0, sizeof(stream));
1152 deflateInit(&stream, Z_BEST_COMPRESSION);
1153 size = deflateBound(&stream, len+hdrlen);
1154 compressed = xmalloc(size);
1157 stream.next_out = compressed;
1158 stream.avail_out = size;
1160 /* First header.. */
1161 stream.next_in = hdr;
1162 stream.avail_in = hdrlen;
1163 while (deflate(&stream, 0) == Z_OK)
1166 /* Then the data itself.. */
1167 stream.next_in = buf;
1168 stream.avail_in = len;
1169 while (deflate(&stream, Z_FINISH) == Z_OK)
1171 deflateEnd(&stream);
1172 size = stream.total_out;
1174 if (write(fd, compressed, size) != size)
1175 die("unable to write file");
1180 ret = link(tmpfile, filename);
1185 * Coda hack - coda doesn't like cross-directory links,
1186 * so we fall back to a rename, which will mean that it
1187 * won't be able to check collisions, but that's not a
1190 * When this succeeds, we just return 0. We have nothing
1193 if (ret == EXDEV && !rename(tmpfile, filename))
1198 if (ret != EEXIST) {
1199 fprintf(stderr, "unable to write sha1 filename %s: %s", filename, strerror(ret));
1202 /* FIXME!!! Collision check here ? */
1208 int write_sha1_from_fd(const unsigned char *sha1, int fd)
1210 char *filename = sha1_file_name(sha1);
1214 unsigned char real_sha1[20];
1215 unsigned char buf[4096];
1216 unsigned char discard[4096];
1220 local = open(filename, O_WRONLY | O_CREAT | O_EXCL, 0666);
1223 return error("Couldn't open %s\n", filename);
1225 memset(&stream, 0, sizeof(stream));
1227 inflateInit(&stream);
1233 size = read(fd, buf, 4096);
1238 return error("Connection closed?");
1239 perror("Reading from connection");
1242 write(local, buf, size);
1243 stream.avail_in = size;
1244 stream.next_in = buf;
1246 stream.next_out = discard;
1247 stream.avail_out = sizeof(discard);
1248 ret = inflate(&stream, Z_SYNC_FLUSH);
1249 SHA1_Update(&c, discard, sizeof(discard) -
1251 } while (stream.avail_in && ret == Z_OK);
1253 } while (ret == Z_OK);
1254 inflateEnd(&stream);
1257 SHA1_Final(real_sha1, &c);
1258 if (ret != Z_STREAM_END) {
1260 return error("File %s corrupted", sha1_to_hex(sha1));
1262 if (memcmp(sha1, real_sha1, 20)) {
1264 return error("File %s has bad hash\n", sha1_to_hex(sha1));
1270 int has_sha1_pack(const unsigned char *sha1)
1272 struct pack_entry e;
1273 return find_pack_entry(sha1, &e);
1276 int has_sha1_file(const unsigned char *sha1)
1279 struct pack_entry e;
1281 if (find_sha1_file(sha1, &st))
1283 return find_pack_entry(sha1, &e);
1286 int index_fd(unsigned char *sha1, int fd, struct stat *st)
1288 unsigned long size = st->st_size;
1294 buf = mmap(NULL, size, PROT_READ, MAP_PRIVATE, fd, 0);
1296 if ((int)(long)buf == -1)
1299 ret = write_sha1_file(buf, size, "blob", sha1);