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Commit | Line | Data |
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b4171320 | 1 | /* |
5e0de328 | 2 | * Copyright (C) 2009-2012 the libgit2 contributors |
b4171320 CMN |
3 | * |
4 | * This file is part of libgit2, distributed under the GNU GPL v2 with | |
5 | * a Linking Exception. For full terms see the included COPYING file. | |
6 | */ | |
7 | ||
8 | #include "tree-cache.h" | |
9 | ||
3ba69ba8 | 10 | static git_tree_cache *find_child(const git_tree_cache *tree, const char *path) |
69bffab9 CMN |
11 | { |
12 | size_t i, dirlen; | |
13 | const char *end; | |
14 | ||
15 | end = strchr(path, '/'); | |
16 | if (end == NULL) { | |
17 | end = strrchr(path, '\0'); | |
18 | } | |
19 | ||
20 | dirlen = end - path; | |
21 | ||
22 | for (i = 0; i < tree->children_count; ++i) { | |
23 | const char *childname = tree->children[i]->name; | |
24 | ||
25 | if (strlen(childname) == dirlen && !memcmp(path, childname, dirlen)) | |
26 | return tree->children[i]; | |
27 | } | |
28 | ||
29 | return NULL; | |
30 | } | |
31 | ||
32 | void git_tree_cache_invalidate_path(git_tree_cache *tree, const char *path) | |
33 | { | |
34 | const char *ptr = path, *end; | |
35 | ||
36 | if (tree == NULL) | |
37 | return; | |
38 | ||
39 | tree->entries = -1; | |
40 | ||
41 | while (ptr != NULL) { | |
42 | end = strchr(ptr, '/'); | |
43 | ||
44 | if (end == NULL) /* End of path */ | |
45 | break; | |
46 | ||
47 | tree = find_child(tree, ptr); | |
48 | if (tree == NULL) /* We don't have that tree */ | |
49 | return; | |
50 | ||
51 | tree->entries = -1; | |
52 | ptr = end + 1; | |
53 | } | |
54 | } | |
55 | ||
3ba69ba8 CMN |
56 | const git_tree_cache *git_tree_cache_get(const git_tree_cache *tree, const char *path) |
57 | { | |
58 | const char *ptr = path, *end; | |
59 | ||
60 | if (tree == NULL) { | |
61 | return NULL; | |
62 | } | |
63 | ||
64 | while (1) { | |
65 | end = strchr(ptr, '/'); | |
66 | ||
67 | tree = find_child(tree, ptr); | |
68 | if (tree == NULL) { /* Can't find it */ | |
69 | return NULL; | |
70 | } | |
71 | ||
3f035860 | 72 | if (end == NULL || *end + 1 == '\0') |
3ba69ba8 CMN |
73 | return tree; |
74 | ||
75 | ptr = end + 1; | |
76 | } | |
77 | } | |
78 | ||
b4171320 CMN |
79 | static int read_tree_internal(git_tree_cache **out, |
80 | const char **buffer_in, const char *buffer_end, git_tree_cache *parent) | |
81 | { | |
69bffab9 | 82 | git_tree_cache *tree = NULL; |
b4171320 CMN |
83 | const char *name_start, *buffer; |
84 | int count; | |
b183ffe7 | 85 | size_t name_len; |
b4171320 CMN |
86 | |
87 | buffer = name_start = *buffer_in; | |
88 | ||
3fbcac89 VM |
89 | if ((buffer = memchr(buffer, '\0', buffer_end - buffer)) == NULL) |
90 | goto corrupted; | |
b4171320 | 91 | |
3fbcac89 VM |
92 | if (++buffer >= buffer_end) |
93 | goto corrupted; | |
b4171320 | 94 | |
b183ffe7 | 95 | name_len = strlen(name_start); |
3fbcac89 VM |
96 | tree = git__malloc(sizeof(git_tree_cache) + name_len + 1); |
97 | GITERR_CHECK_ALLOC(tree); | |
b183ffe7 CMN |
98 | |
99 | memset(tree, 0x0, sizeof(git_tree_cache)); | |
100 | tree->parent = parent; | |
101 | ||
102 | /* NUL-terminated tree name */ | |
103 | memcpy(tree->name, name_start, name_len); | |
104 | tree->name[name_len] = '\0'; | |
105 | ||
b4171320 | 106 | /* Blank-terminated ASCII decimal number of entries in this tree */ |
08f3d6ca | 107 | if (git__strtol32(&count, buffer, &buffer, 10) < 0) |
3fbcac89 | 108 | goto corrupted; |
b4171320 | 109 | |
b4171320 CMN |
110 | tree->entries = count; |
111 | ||
3fbcac89 VM |
112 | if (*buffer != ' ' || ++buffer >= buffer_end) |
113 | goto corrupted; | |
b4171320 CMN |
114 | |
115 | /* Number of children of the tree, newline-terminated */ | |
3fbcac89 VM |
116 | if (git__strtol32(&count, buffer, &buffer, 10) < 0 || count < 0) |
117 | goto corrupted; | |
b4171320 CMN |
118 | |
119 | tree->children_count = count; | |
120 | ||
3fbcac89 VM |
121 | if (*buffer != '\n' || ++buffer > buffer_end) |
122 | goto corrupted; | |
b4171320 | 123 | |
acd31b4a CMN |
124 | /* The SHA1 is only there if it's not invalidated */ |
125 | if (tree->entries >= 0) { | |
126 | /* 160-bit SHA-1 for this tree and it's children */ | |
3fbcac89 VM |
127 | if (buffer + GIT_OID_RAWSZ > buffer_end) |
128 | goto corrupted; | |
b4171320 | 129 | |
acd31b4a CMN |
130 | git_oid_fromraw(&tree->oid, (const unsigned char *)buffer); |
131 | buffer += GIT_OID_RAWSZ; | |
132 | } | |
b4171320 CMN |
133 | |
134 | /* Parse children: */ | |
135 | if (tree->children_count > 0) { | |
136 | unsigned int i; | |
b4171320 CMN |
137 | |
138 | tree->children = git__malloc(tree->children_count * sizeof(git_tree_cache *)); | |
3fbcac89 | 139 | GITERR_CHECK_ALLOC(tree->children); |
b4171320 CMN |
140 | |
141 | for (i = 0; i < tree->children_count; ++i) { | |
3fbcac89 VM |
142 | if (read_tree_internal(&tree->children[i], &buffer, buffer_end, tree) < 0) |
143 | return -1; | |
b4171320 CMN |
144 | } |
145 | } | |
146 | ||
147 | *buffer_in = buffer; | |
148 | *out = tree; | |
3fbcac89 | 149 | return 0; |
b4171320 | 150 | |
3fbcac89 | 151 | corrupted: |
b4171320 | 152 | git_tree_cache_free(tree); |
3fbcac89 VM |
153 | giterr_set(GITERR_INDEX, "Corruped TREE extension in index"); |
154 | return -1; | |
b4171320 CMN |
155 | } |
156 | ||
157 | int git_tree_cache_read(git_tree_cache **tree, const char *buffer, size_t buffer_size) | |
158 | { | |
159 | const char *buffer_end = buffer + buffer_size; | |
b4171320 | 160 | |
3fbcac89 VM |
161 | if (read_tree_internal(tree, &buffer, buffer_end, NULL) < 0) |
162 | return -1; | |
b4171320 | 163 | |
3fbcac89 VM |
164 | if (buffer < buffer_end) { |
165 | giterr_set(GITERR_INDEX, "Corruped TREE extension in index (unexpected trailing data)"); | |
166 | return -1; | |
167 | } | |
b4171320 | 168 | |
3fbcac89 | 169 | return 0; |
b4171320 CMN |
170 | } |
171 | ||
172 | void git_tree_cache_free(git_tree_cache *tree) | |
173 | { | |
174 | unsigned int i; | |
175 | ||
176 | if (tree == NULL) | |
177 | return; | |
178 | ||
179 | for (i = 0; i < tree->children_count; ++i) | |
180 | git_tree_cache_free(tree->children[i]); | |
181 | ||
3286c408 VM |
182 | git__free(tree->children); |
183 | git__free(tree); | |
b4171320 | 184 | } |