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Commit | Line | Data |
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1b0c7174 JH |
1 | #include "cache.h" |
2 | #include "tree-walk.h" | |
8e440259 | 3 | #include "tree.h" |
1b0c7174 JH |
4 | |
5 | void *fill_tree_descriptor(struct tree_desc *desc, const unsigned char *sha1) | |
6 | { | |
7 | unsigned long size = 0; | |
8 | void *buf = NULL; | |
9 | ||
10 | if (sha1) { | |
8e440259 | 11 | buf = read_object_with_reference(sha1, tree_type, &size, NULL); |
1b0c7174 JH |
12 | if (!buf) |
13 | die("unable to read tree %s", sha1_to_hex(sha1)); | |
14 | } | |
15 | desc->size = size; | |
16 | desc->buf = buf; | |
17 | return buf; | |
18 | } | |
19 | ||
20 | static int entry_compare(struct name_entry *a, struct name_entry *b) | |
21 | { | |
22 | return base_name_compare( | |
23 | a->path, a->pathlen, a->mode, | |
24 | b->path, b->pathlen, b->mode); | |
25 | } | |
26 | ||
27 | static void entry_clear(struct name_entry *a) | |
28 | { | |
29 | memset(a, 0, sizeof(*a)); | |
30 | } | |
31 | ||
32 | static void entry_extract(struct tree_desc *t, struct name_entry *a) | |
33 | { | |
34 | a->sha1 = tree_entry_extract(t, &a->path, &a->mode); | |
35 | a->pathlen = strlen(a->path); | |
36 | } | |
37 | ||
38 | void update_tree_entry(struct tree_desc *desc) | |
39 | { | |
4c068a98 | 40 | const void *buf = desc->buf; |
1b0c7174 JH |
41 | unsigned long size = desc->size; |
42 | int len = strlen(buf) + 1 + 20; | |
43 | ||
44 | if (size < len) | |
45 | die("corrupt tree file"); | |
1d7f171c | 46 | desc->buf = (char *) buf + len; |
1b0c7174 JH |
47 | desc->size = size - len; |
48 | } | |
49 | ||
7d65848a LT |
50 | static const char *get_mode(const char *str, unsigned int *modep) |
51 | { | |
52 | unsigned char c; | |
53 | unsigned int mode = 0; | |
54 | ||
55 | while ((c = *str++) != ' ') { | |
56 | if (c < '0' || c > '7') | |
57 | return NULL; | |
58 | mode = (mode << 3) + (c - '0'); | |
59 | } | |
60 | *modep = mode; | |
61 | return str; | |
62 | } | |
63 | ||
1b0c7174 JH |
64 | const unsigned char *tree_entry_extract(struct tree_desc *desc, const char **pathp, unsigned int *modep) |
65 | { | |
4c068a98 | 66 | const void *tree = desc->buf; |
1b0c7174 JH |
67 | unsigned long size = desc->size; |
68 | int len = strlen(tree)+1; | |
1d7f171c | 69 | const unsigned char *sha1 = (unsigned char *) tree + len; |
7d65848a | 70 | const char *path; |
1b0c7174 JH |
71 | unsigned int mode; |
72 | ||
7d65848a LT |
73 | path = get_mode(tree, &mode); |
74 | if (!path || size < len + 20) | |
1b0c7174 | 75 | die("corrupt tree file"); |
7d65848a | 76 | *pathp = path; |
1b0c7174 JH |
77 | *modep = canon_mode(mode); |
78 | return sha1; | |
79 | } | |
80 | ||
4c068a98 LT |
81 | int tree_entry(struct tree_desc *desc, struct name_entry *entry) |
82 | { | |
1d7f171c FF |
83 | const void *tree = desc->buf; |
84 | const char *path; | |
4c068a98 LT |
85 | unsigned long len, size = desc->size; |
86 | ||
87 | if (!size) | |
88 | return 0; | |
89 | ||
90 | path = get_mode(tree, &entry->mode); | |
91 | if (!path) | |
92 | die("corrupt tree file"); | |
93 | ||
94 | entry->path = path; | |
95 | len = strlen(path); | |
96 | entry->pathlen = len; | |
97 | ||
98 | path += len + 1; | |
1d7f171c | 99 | entry->sha1 = (const unsigned char *) path; |
4c068a98 LT |
100 | |
101 | path += 20; | |
1d7f171c | 102 | len = path - (char *) tree; |
4c068a98 LT |
103 | if (len > size) |
104 | die("corrupt tree file"); | |
105 | ||
106 | desc->buf = path; | |
107 | desc->size = size - len; | |
108 | return 1; | |
109 | } | |
110 | ||
1b0c7174 JH |
111 | void traverse_trees(int n, struct tree_desc *t, const char *base, traverse_callback_t callback) |
112 | { | |
113 | struct name_entry *entry = xmalloc(n*sizeof(*entry)); | |
114 | ||
115 | for (;;) { | |
1b0c7174 JH |
116 | unsigned long mask = 0; |
117 | int i, last; | |
118 | ||
119 | last = -1; | |
120 | for (i = 0; i < n; i++) { | |
121 | if (!t[i].size) | |
122 | continue; | |
123 | entry_extract(t+i, entry+i); | |
124 | if (last >= 0) { | |
125 | int cmp = entry_compare(entry+i, entry+last); | |
126 | ||
127 | /* | |
128 | * Is the new name bigger than the old one? | |
129 | * Ignore it | |
130 | */ | |
131 | if (cmp > 0) | |
132 | continue; | |
133 | /* | |
134 | * Is the new name smaller than the old one? | |
135 | * Ignore all old ones | |
136 | */ | |
137 | if (cmp < 0) | |
138 | mask = 0; | |
139 | } | |
140 | mask |= 1ul << i; | |
141 | last = i; | |
142 | } | |
143 | if (!mask) | |
144 | break; | |
145 | ||
146 | /* | |
147 | * Update the tree entries we've walked, and clear | |
148 | * all the unused name-entries. | |
149 | */ | |
150 | for (i = 0; i < n; i++) { | |
151 | if (mask & (1ul << i)) { | |
152 | update_tree_entry(t+i); | |
153 | continue; | |
154 | } | |
155 | entry_clear(entry + i); | |
156 | } | |
157 | callback(n, mask, entry, base); | |
158 | } | |
159 | free(entry); | |
160 | } | |
161 | ||
4dcff634 JH |
162 | static int find_tree_entry(struct tree_desc *t, const char *name, unsigned char *result, unsigned *mode) |
163 | { | |
164 | int namelen = strlen(name); | |
165 | while (t->size) { | |
166 | const char *entry; | |
167 | const unsigned char *sha1; | |
168 | int entrylen, cmp; | |
169 | ||
170 | sha1 = tree_entry_extract(t, &entry, mode); | |
171 | update_tree_entry(t); | |
172 | entrylen = strlen(entry); | |
173 | if (entrylen > namelen) | |
174 | continue; | |
175 | cmp = memcmp(name, entry, entrylen); | |
176 | if (cmp > 0) | |
177 | continue; | |
178 | if (cmp < 0) | |
179 | break; | |
180 | if (entrylen == namelen) { | |
e702496e | 181 | hashcpy(result, sha1); |
4dcff634 JH |
182 | return 0; |
183 | } | |
184 | if (name[entrylen] != '/') | |
185 | continue; | |
186 | if (!S_ISDIR(*mode)) | |
187 | break; | |
188 | if (++entrylen == namelen) { | |
e702496e | 189 | hashcpy(result, sha1); |
4dcff634 JH |
190 | return 0; |
191 | } | |
192 | return get_tree_entry(sha1, name + entrylen, result, mode); | |
193 | } | |
194 | return -1; | |
195 | } | |
196 | ||
197 | int get_tree_entry(const unsigned char *tree_sha1, const char *name, unsigned char *sha1, unsigned *mode) | |
198 | { | |
199 | int retval; | |
200 | void *tree; | |
201 | struct tree_desc t; | |
d93b7d1c | 202 | unsigned char root[20]; |
4dcff634 | 203 | |
d93b7d1c | 204 | tree = read_object_with_reference(tree_sha1, tree_type, &t.size, root); |
4dcff634 JH |
205 | if (!tree) |
206 | return -1; | |
d93b7d1c JK |
207 | |
208 | if (name[0] == '\0') { | |
209 | hashcpy(sha1, root); | |
210 | return 0; | |
211 | } | |
212 | ||
4dcff634 JH |
213 | t.buf = tree; |
214 | retval = find_tree_entry(&t, name, sha1, mode); | |
215 | free(tree); | |
216 | return retval; | |
217 | } | |
218 |