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 = malloc(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, 1);
  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 = malloc(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 = malloc(sizeof(struct tree));
  78                memset(ret, 0, sizeof(struct tree));
  79                created_object(sha1, &ret->object);
  80                return ret;
  81        }
  82        if (obj->parsed && obj->type != tree_type) {
  83                error("Object %s is a %s, not a tree", 
  84                      sha1_to_hex(sha1), obj->type);
  85                return NULL;
  86        }
  87        return (struct tree *) obj;
  88}
  89
  90int parse_tree(struct tree *item)
  91{
  92        char type[20];
  93        void *buffer, *bufptr;
  94        unsigned long size;
  95        if (item->object.parsed)
  96                return 0;
  97        item->object.parsed = 1;
  98        item->object.type = tree_type;
  99        buffer = bufptr = read_sha1_file(item->object.sha1, type, &size);
 100        if (!buffer)
 101                return error("Could not read %s",
 102                             sha1_to_hex(item->object.sha1));
 103        if (strcmp(type, tree_type))
 104                return error("Object %s not a tree",
 105                             sha1_to_hex(item->object.sha1));
 106        while (size) {
 107                struct object *obj;
 108                int len = 1+strlen(bufptr);
 109                unsigned char *file_sha1 = bufptr + len;
 110                char *path = strchr(bufptr, ' ');
 111                unsigned int mode;
 112                if (size < len + 20 || !path || 
 113                    sscanf(bufptr, "%o", &mode) != 1)
 114                        return -1;
 115
 116                /* Warn about trees that don't do the recursive thing.. */
 117                if (strchr(path, '/')) {
 118                        item->has_full_path = 1;
 119                }
 120
 121                bufptr += len + 20;
 122                size -= len + 20;
 123
 124                if (S_ISDIR(mode)) {
 125                        obj = &lookup_tree(file_sha1)->object;
 126                } else {
 127                        obj = &lookup_blob(file_sha1)->object;
 128                }
 129                add_ref(&item->object, obj);
 130        }
 131        return 0;
 132}