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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 | 4 | |
4651ece8 LT |
5 | static const char *get_mode(const char *str, unsigned int *modep) |
6 | { | |
7 | unsigned char c; | |
8 | unsigned int mode = 0; | |
9 | ||
64cc1c09 MK |
10 | if (*str == ' ') |
11 | return NULL; | |
12 | ||
4651ece8 LT |
13 | while ((c = *str++) != ' ') { |
14 | if (c < '0' || c > '7') | |
15 | return NULL; | |
16 | mode = (mode << 3) + (c - '0'); | |
17 | } | |
18 | *modep = mode; | |
19 | return str; | |
20 | } | |
21 | ||
64cc1c09 | 22 | static void decode_tree_entry(struct tree_desc *desc, const char *buf, unsigned long size) |
4651ece8 LT |
23 | { |
24 | const char *path; | |
25 | unsigned int mode, len; | |
26 | ||
64cc1c09 MK |
27 | if (size < 24 || buf[size - 21]) |
28 | die("corrupt tree file"); | |
29 | ||
4651ece8 | 30 | path = get_mode(buf, &mode); |
64cc1c09 | 31 | if (!path || !*path) |
4651ece8 LT |
32 | die("corrupt tree file"); |
33 | len = strlen(path) + 1; | |
34 | ||
35 | /* Initialize the descriptor entry */ | |
36 | desc->entry.path = path; | |
37 | desc->entry.mode = mode; | |
38 | desc->entry.sha1 = (const unsigned char *)(path + len); | |
39 | } | |
40 | ||
6fda5e51 LT |
41 | void init_tree_desc(struct tree_desc *desc, const void *buffer, unsigned long size) |
42 | { | |
43 | desc->buffer = buffer; | |
44 | desc->size = size; | |
4651ece8 LT |
45 | if (size) |
46 | decode_tree_entry(desc, buffer, size); | |
6fda5e51 LT |
47 | } |
48 | ||
1b0c7174 JH |
49 | void *fill_tree_descriptor(struct tree_desc *desc, const unsigned char *sha1) |
50 | { | |
51 | unsigned long size = 0; | |
52 | void *buf = NULL; | |
53 | ||
54 | if (sha1) { | |
8e440259 | 55 | buf = read_object_with_reference(sha1, tree_type, &size, NULL); |
1b0c7174 JH |
56 | if (!buf) |
57 | die("unable to read tree %s", sha1_to_hex(sha1)); | |
58 | } | |
6fda5e51 | 59 | init_tree_desc(desc, buf, size); |
1b0c7174 JH |
60 | return buf; |
61 | } | |
62 | ||
63 | static int entry_compare(struct name_entry *a, struct name_entry *b) | |
64 | { | |
65 | return base_name_compare( | |
a8c40471 LT |
66 | a->path, tree_entry_len(a->path, a->sha1), a->mode, |
67 | b->path, tree_entry_len(b->path, b->sha1), b->mode); | |
1b0c7174 JH |
68 | } |
69 | ||
70 | static void entry_clear(struct name_entry *a) | |
71 | { | |
72 | memset(a, 0, sizeof(*a)); | |
73 | } | |
74 | ||
75 | static void entry_extract(struct tree_desc *t, struct name_entry *a) | |
76 | { | |
4651ece8 | 77 | *a = t->entry; |
1b0c7174 JH |
78 | } |
79 | ||
80 | void update_tree_entry(struct tree_desc *desc) | |
81 | { | |
6fda5e51 | 82 | const void *buf = desc->buffer; |
4651ece8 | 83 | const unsigned char *end = desc->entry.sha1 + 20; |
1b0c7174 | 84 | unsigned long size = desc->size; |
4651ece8 | 85 | unsigned long len = end - (const unsigned char *)buf; |
1b0c7174 JH |
86 | |
87 | if (size < len) | |
88 | die("corrupt tree file"); | |
4651ece8 LT |
89 | buf = end; |
90 | size -= len; | |
91 | desc->buffer = buf; | |
92 | desc->size = size; | |
93 | if (size) | |
94 | decode_tree_entry(desc, buf, size); | |
1b0c7174 JH |
95 | } |
96 | ||
4c068a98 LT |
97 | int tree_entry(struct tree_desc *desc, struct name_entry *entry) |
98 | { | |
4651ece8 | 99 | if (!desc->size) |
4c068a98 LT |
100 | return 0; |
101 | ||
4651ece8 LT |
102 | *entry = desc->entry; |
103 | update_tree_entry(desc); | |
4c068a98 LT |
104 | return 1; |
105 | } | |
106 | ||
1b0c7174 JH |
107 | void traverse_trees(int n, struct tree_desc *t, const char *base, traverse_callback_t callback) |
108 | { | |
109 | struct name_entry *entry = xmalloc(n*sizeof(*entry)); | |
110 | ||
111 | for (;;) { | |
1b0c7174 JH |
112 | unsigned long mask = 0; |
113 | int i, last; | |
114 | ||
115 | last = -1; | |
116 | for (i = 0; i < n; i++) { | |
117 | if (!t[i].size) | |
118 | continue; | |
119 | entry_extract(t+i, entry+i); | |
120 | if (last >= 0) { | |
121 | int cmp = entry_compare(entry+i, entry+last); | |
122 | ||
123 | /* | |
124 | * Is the new name bigger than the old one? | |
125 | * Ignore it | |
126 | */ | |
127 | if (cmp > 0) | |
128 | continue; | |
129 | /* | |
130 | * Is the new name smaller than the old one? | |
131 | * Ignore all old ones | |
132 | */ | |
133 | if (cmp < 0) | |
134 | mask = 0; | |
135 | } | |
136 | mask |= 1ul << i; | |
137 | last = i; | |
138 | } | |
139 | if (!mask) | |
140 | break; | |
141 | ||
142 | /* | |
143 | * Update the tree entries we've walked, and clear | |
144 | * all the unused name-entries. | |
145 | */ | |
146 | for (i = 0; i < n; i++) { | |
147 | if (mask & (1ul << i)) { | |
148 | update_tree_entry(t+i); | |
149 | continue; | |
150 | } | |
151 | entry_clear(entry + i); | |
152 | } | |
153 | callback(n, mask, entry, base); | |
154 | } | |
155 | free(entry); | |
156 | } | |
157 | ||
4dcff634 JH |
158 | static int find_tree_entry(struct tree_desc *t, const char *name, unsigned char *result, unsigned *mode) |
159 | { | |
160 | int namelen = strlen(name); | |
161 | while (t->size) { | |
162 | const char *entry; | |
163 | const unsigned char *sha1; | |
164 | int entrylen, cmp; | |
165 | ||
166 | sha1 = tree_entry_extract(t, &entry, mode); | |
167 | update_tree_entry(t); | |
304de2d2 | 168 | entrylen = tree_entry_len(entry, sha1); |
4dcff634 JH |
169 | if (entrylen > namelen) |
170 | continue; | |
171 | cmp = memcmp(name, entry, entrylen); | |
172 | if (cmp > 0) | |
173 | continue; | |
174 | if (cmp < 0) | |
175 | break; | |
176 | if (entrylen == namelen) { | |
e702496e | 177 | hashcpy(result, sha1); |
4dcff634 JH |
178 | return 0; |
179 | } | |
180 | if (name[entrylen] != '/') | |
181 | continue; | |
182 | if (!S_ISDIR(*mode)) | |
183 | break; | |
184 | if (++entrylen == namelen) { | |
e702496e | 185 | hashcpy(result, sha1); |
4dcff634 JH |
186 | return 0; |
187 | } | |
188 | return get_tree_entry(sha1, name + entrylen, result, mode); | |
189 | } | |
190 | return -1; | |
191 | } | |
192 | ||
193 | int get_tree_entry(const unsigned char *tree_sha1, const char *name, unsigned char *sha1, unsigned *mode) | |
194 | { | |
195 | int retval; | |
196 | void *tree; | |
6fda5e51 | 197 | unsigned long size; |
4dcff634 | 198 | struct tree_desc t; |
d93b7d1c | 199 | unsigned char root[20]; |
4dcff634 | 200 | |
6fda5e51 | 201 | tree = read_object_with_reference(tree_sha1, tree_type, &size, root); |
4dcff634 JH |
202 | if (!tree) |
203 | return -1; | |
d93b7d1c JK |
204 | |
205 | if (name[0] == '\0') { | |
206 | hashcpy(sha1, root); | |
207 | return 0; | |
208 | } | |
209 | ||
6fda5e51 | 210 | init_tree_desc(&t, tree, size); |
4dcff634 JH |
211 | retval = find_tree_entry(&t, name, sha1, mode); |
212 | free(tree); | |
213 | return retval; | |
214 | } |