[PATCH] Implementations of parsing functions
[git.git] / tree.c
1 #include "tree.h"
2 #include "blob.h"
3 #include "cache.h"
4 #include <stdlib.h>
5
6 const char *tree_type = "tree";
7
8 struct tree *lookup_tree(unsigned char *sha1)
9 {
10         struct object *obj = lookup_object(sha1);
11         if (!obj) {
12                 struct tree *ret = malloc(sizeof(struct tree));
13                 memset(ret, 0, sizeof(struct tree));
14                 created_object(sha1, &ret->object);
15                 return ret;
16         }
17         if (obj->parsed && obj->type != tree_type) {
18                 error("Object %s is a %s, not a tree", 
19                       sha1_to_hex(sha1), obj->type);
20                 return NULL;
21         }
22         return (struct tree *) obj;
23 }
24
25 int parse_tree(struct tree *item)
26 {
27         char type[20];
28         void *buffer, *bufptr;
29         unsigned long size;
30         if (item->object.parsed)
31                 return 0;
32         item->object.parsed = 1;
33         item->object.type = tree_type;
34         buffer = bufptr = read_sha1_file(item->object.sha1, type, &size);
35         if (!buffer)
36                 return error("Could not read %s",
37                              sha1_to_hex(item->object.sha1));
38         if (strcmp(type, tree_type))
39                 return error("Object %s not a tree",
40                              sha1_to_hex(item->object.sha1));
41         while (size) {
42                 struct object *obj;
43                 int len = 1+strlen(bufptr);
44                 unsigned char *file_sha1 = bufptr + len;
45                 char *path = strchr(bufptr, ' ');
46                 unsigned int mode;
47                 if (size < len + 20 || !path || 
48                     sscanf(bufptr, "%o", &mode) != 1)
49                         return -1;
50
51                 /* Warn about trees that don't do the recursive thing.. */
52                 if (strchr(path, '/')) {
53                         item->has_full_path = 1;
54                 }
55
56                 bufptr += len + 20;
57                 size -= len + 20;
58
59                 if (S_ISDIR(mode)) {
60                         obj = &lookup_tree(file_sha1)->object;
61                 } else {
62                         obj = &lookup_blob(file_sha1)->object;
63                 }
64                 add_ref(&item->object, obj);
65         }
66         return 0;
67 }