2005-08-04 05:15:49 +00:00
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#include "cache.h"
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#include "commit.h"
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static int find_short_object_filename(int len, const char *name, unsigned char *sha1)
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{
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static char dirname[PATH_MAX];
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char hex[40];
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DIR *dir;
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int found;
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snprintf(dirname, sizeof(dirname), "%s/%.2s", get_object_directory(), name);
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dir = opendir(dirname);
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sprintf(hex, "%.2s", name);
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found = 0;
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if (dir) {
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struct dirent *de;
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while ((de = readdir(dir)) != NULL) {
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if (strlen(de->d_name) != 38)
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continue;
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if (memcmp(de->d_name, name + 2, len-2))
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continue;
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memcpy(hex + 2, de->d_name, 38);
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if (++found > 1)
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break;
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}
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closedir(dir);
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}
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if (found == 1)
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return get_sha1_hex(hex, sha1) == 0;
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return 0;
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}
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static int match_sha(unsigned len, const unsigned char *a, const unsigned char *b)
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{
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do {
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if (*a != *b)
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return 0;
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a++;
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b++;
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len -= 2;
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} while (len > 1);
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if (len)
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if ((*a ^ *b) & 0xf0)
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return 0;
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return 1;
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}
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static int find_short_packed_object(int len, const unsigned char *match, unsigned char *sha1)
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{
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struct packed_git *p;
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prepare_packed_git();
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for (p = packed_git; p; p = p->next) {
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unsigned num = num_packed_objects(p);
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unsigned first = 0, last = num;
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while (first < last) {
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unsigned mid = (first + last) / 2;
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unsigned char now[20];
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int cmp;
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nth_packed_object_sha1(p, mid, now);
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cmp = memcmp(match, now, 20);
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if (!cmp) {
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first = mid;
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break;
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}
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if (cmp > 0) {
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first = mid+1;
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continue;
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}
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last = mid;
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}
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if (first < num) {
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unsigned char now[20], next[20];
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nth_packed_object_sha1(p, first, now);
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if (match_sha(len, match, now)) {
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if (nth_packed_object_sha1(p, first+1, next) || !match_sha(len, match, next)) {
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memcpy(sha1, now, 20);
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return 1;
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}
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}
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}
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}
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return 0;
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}
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static int get_short_sha1(const char *name, unsigned char *sha1)
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{
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int i;
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char canonical[40];
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unsigned char res[20];
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memset(res, 0, 20);
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memset(canonical, 'x', 40);
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for (i = 0;;i++) {
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unsigned char c = name[i];
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unsigned char val;
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if (!c || i > 40)
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break;
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if (c >= '0' && c <= '9')
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val = c - '0';
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else if (c >= 'a' && c <= 'f')
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val = c - 'a' + 10;
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else if (c >= 'A' && c <='F') {
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val = c - 'A' + 10;
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c -= 'A' - 'a';
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}
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else
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return -1;
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canonical[i] = c;
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if (!(i & 1))
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val <<= 4;
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res[i >> 1] |= val;
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}
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if (i < 4)
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return -1;
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if (find_short_object_filename(i, canonical, sha1))
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return 0;
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if (find_short_packed_object(i, res, sha1))
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return 0;
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return -1;
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}
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static int get_sha1_file(const char *path, unsigned char *result)
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{
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char buffer[60];
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int fd = open(path, O_RDONLY);
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int len;
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if (fd < 0)
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return -1;
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len = read(fd, buffer, sizeof(buffer));
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close(fd);
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if (len < 40)
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return -1;
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return get_sha1_hex(buffer, result);
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}
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static int get_sha1_basic(const char *str, int len, unsigned char *sha1)
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{
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static const char *prefix[] = {
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"",
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"refs",
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"refs/tags",
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"refs/heads",
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NULL
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};
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const char **p;
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2005-08-13 18:05:25 +00:00
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if (len == 40 && !get_sha1_hex(str, sha1))
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2005-08-04 05:15:49 +00:00
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return 0;
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for (p = prefix; *p; p++) {
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char *pathname = git_path("%s/%.*s", *p, len, str);
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if (!get_sha1_file(pathname, sha1))
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return 0;
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}
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return -1;
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}
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static int get_sha1_1(const char *name, int len, unsigned char *sha1);
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static int get_parent(const char *name, int len,
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unsigned char *result, int idx)
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{
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unsigned char sha1[20];
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int ret = get_sha1_1(name, len, sha1);
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struct commit *commit;
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struct commit_list *p;
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if (ret)
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return ret;
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commit = lookup_commit_reference(sha1);
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if (!commit)
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return -1;
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if (parse_commit(commit))
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return -1;
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if (!idx) {
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memcpy(result, commit->object.sha1, 20);
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return 0;
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}
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p = commit->parents;
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while (p) {
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if (!--idx) {
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memcpy(result, p->item->object.sha1, 20);
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return 0;
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}
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p = p->next;
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}
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return -1;
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}
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2005-08-21 09:43:54 +00:00
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static int get_nth_ancestor(const char *name, int len,
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unsigned char *result, int generation)
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{
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unsigned char sha1[20];
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int ret = get_sha1_1(name, len, sha1);
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if (ret)
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return ret;
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while (generation--) {
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struct commit *commit = lookup_commit_reference(sha1);
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if (!commit || parse_commit(commit) || !commit->parents)
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return -1;
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memcpy(sha1, commit->parents->item->object.sha1, 20);
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}
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memcpy(result, sha1, 20);
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return 0;
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}
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2005-08-04 05:15:49 +00:00
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static int get_sha1_1(const char *name, int len, unsigned char *sha1)
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{
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int parent, ret;
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2005-08-21 09:43:54 +00:00
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const char *cp;
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2005-08-04 05:15:49 +00:00
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/* foo^[0-9] or foo^ (== foo^1); we do not do more than 9 parents. */
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if (len > 2 && name[len-2] == '^' &&
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name[len-1] >= '0' && name[len-1] <= '9') {
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parent = name[len-1] - '0';
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len -= 2;
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}
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2005-08-10 03:07:36 +00:00
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else if (len > 1 && name[len-1] == '^') {
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2005-08-04 05:15:49 +00:00
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parent = 1;
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2005-08-10 03:07:36 +00:00
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len--;
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} else
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2005-08-04 05:15:49 +00:00
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parent = -1;
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2005-08-13 17:50:56 +00:00
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if (parent >= 0)
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return get_parent(name, len, sha1, parent);
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2005-08-21 09:43:54 +00:00
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/* "name~3" is "name^^^",
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* "name~12" is "name^^^^^^^^^^^^", and
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* "name~" and "name~0" are name -- not "name^0"!
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*/
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parent = 0;
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for (cp = name + len - 1; name <= cp; cp--) {
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int ch = *cp;
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if ('0' <= ch && ch <= '9')
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continue;
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if (ch != '~')
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parent = -1;
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break;
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}
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if (!parent && *cp == '~') {
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int len1 = cp - name;
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cp++;
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while (cp < name + len)
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parent = parent * 10 + *cp++ - '0';
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return get_nth_ancestor(name, len1, sha1, parent);
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}
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2005-08-04 05:15:49 +00:00
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ret = get_sha1_basic(name, len, sha1);
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if (!ret)
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return 0;
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return get_short_sha1(name, sha1);
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}
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/*
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* This is like "get_sha1_basic()", except it allows "sha1 expressions",
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* notably "xyz^" for "parent of xyz"
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*/
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int get_sha1(const char *name, unsigned char *sha1)
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{
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return get_sha1_1(name, strlen(name), sha1);
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}
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