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 }