Andrew's git - gitweb.git/blob

   1#include "tree.h"
   2#include "blob.h"
   3#include "cache.h"
   4#include <stdlib.h>
   5
   6const char *tree_type = "tree";
   7
   8static int read_one_entry(unsigned char *sha1, const char *base, int baselen, const char *pathname, unsigned mode, int stage)
   9{
  10        int len = strlen(pathname);
  11        unsigned int size = cache_entry_size(baselen + len);
  12        struct cache_entry *ce = xmalloc(size);
  13
  14        memset(ce, 0, size);
  15
  16        ce->ce_mode = create_ce_mode(mode);
  17        ce->ce_flags = create_ce_flags(baselen + len, stage);
  18        memcpy(ce->name, base, baselen);
  19        memcpy(ce->name + baselen, pathname, len+1);
  20        memcpy(ce->sha1, sha1, 20);
  21        return add_cache_entry(ce, ADD_CACHE_OK_TO_ADD);
  22}
  23
  24static int read_tree_recursive(void *buffer, unsigned long size,
  25                               const char *base, int baselen, int stage)
  26{
  27        while (size) {
  28                int len = strlen(buffer)+1;
  29                unsigned char *sha1 = buffer + len;
  30                char *path = strchr(buffer, ' ')+1;
  31                unsigned int mode;
  32
  33                if (size < len + 20 || sscanf(buffer, "%o", &mode) != 1)
  34                        return -1;
  35
  36                buffer = sha1 + 20;
  37                size -= len + 20;
  38
  39                if (S_ISDIR(mode)) {
  40                        int retval;
  41                        int pathlen = strlen(path);
  42                        char *newbase = xmalloc(baselen + 1 + pathlen);
  43                        void *eltbuf;
  44                        char elttype[20];
  45                        unsigned long eltsize;
  46
  47                        eltbuf = read_sha1_file(sha1, elttype, &eltsize);
  48                        if (!eltbuf || strcmp(elttype, "tree"))
  49                                return -1;
  50                        memcpy(newbase, base, baselen);
  51                        memcpy(newbase + baselen, path, pathlen);
  52                        newbase[baselen + pathlen] = '/';
  53                        retval = read_tree_recursive(eltbuf, eltsize,
  54                                                     newbase,
  55                                                     baselen + pathlen + 1, stage);
  56                        free(eltbuf);
  57                        free(newbase);
  58                        if (retval)
  59                                return -1;
  60                        continue;
  61                }
  62                if (read_one_entry(sha1, base, baselen, path, mode, stage) < 0)
  63                        return -1;
  64        }
  65        return 0;
  66}
  67
  68int read_tree(void *buffer, unsigned long size, int stage)
  69{
  70        return read_tree_recursive(buffer, size, "", 0, stage);
  71}
  72
  73struct tree *lookup_tree(unsigned char *sha1)
  74{
  75        struct object *obj = lookup_object(sha1);
  76        if (!obj) {
  77                struct tree *ret = xmalloc(sizeof(struct tree));
  78                memset(ret, 0, sizeof(struct tree));
  79                created_object(sha1, &ret->object);
  80                ret->object.type = tree_type;
  81                return ret;
  82        }
  83        if (obj->type != tree_type) {
  84                error("Object %s is a %s, not a tree", 
  85                      sha1_to_hex(sha1), obj->type);
  86                return NULL;
  87        }
  88        return (struct tree *) obj;
  89}
  90
  91int parse_tree_buffer(struct tree *item, void *buffer, unsigned long size)
  92{
  93        void *bufptr = buffer;
  94        struct tree_entry_list **list_p;
  95
  96        if (item->object.parsed)
  97                return 0;
  98        item->object.parsed = 1;
  99        list_p = &item->entries;
 100        while (size) {
 101                struct object *obj;
 102                struct tree_entry_list *entry;
 103                int len = 1+strlen(bufptr);
 104                unsigned char *file_sha1 = bufptr + len;
 105                char *path = strchr(bufptr, ' ');
 106                unsigned int mode;
 107                if (size < len + 20 || !path || 
 108                    sscanf(bufptr, "%o", &mode) != 1)
 109                        return -1;
 110
 111                entry = xmalloc(sizeof(struct tree_entry_list));
 112                entry->name = strdup(path + 1);
 113                entry->directory = S_ISDIR(mode) != 0;
 114                entry->executable = (mode & S_IXUSR) != 0;
 115                entry->symlink = S_ISLNK(mode) != 0;
 116                entry->mode = mode;
 117                entry->next = NULL;
 118
 119                bufptr += len + 20;
 120                size -= len + 20;
 121
 122                if (entry->directory) {
 123                        entry->item.tree = lookup_tree(file_sha1);
 124                        obj = &entry->item.tree->object;
 125                } else {
 126                        entry->item.blob = lookup_blob(file_sha1);
 127                        obj = &entry->item.blob->object;
 128                }
 129                if (obj)
 130                        add_ref(&item->object, obj);
 131
 132                *list_p = entry;
 133                list_p = &entry->next;
 134        }
 135        return 0;
 136}
 137
 138int parse_tree(struct tree *item)
 139{
 140         char type[20];
 141         void *buffer;
 142         unsigned long size;
 143         int ret;
 144
 145        if (item->object.parsed)
 146                return 0;
 147        buffer = read_sha1_file(item->object.sha1, type, &size);
 148        if (!buffer)
 149                return error("Could not read %s",
 150                             sha1_to_hex(item->object.sha1));
 151        if (strcmp(type, tree_type)) {
 152                free(buffer);
 153                return error("Object %s not a tree",
 154                             sha1_to_hex(item->object.sha1));
 155        }
 156        ret = parse_tree_buffer(item, buffer, size);
 157        free(buffer);
 158        return ret;
 159}