wimlib.net Git - wimlib/blob - src/reference.c

   1 /*
   2  * reference.c
   3  *
   4  * Reference resources from external WIM file(s).
   5  */
   6
   7 /*
   8  * Copyright (C) 2013 Eric Biggers
   9  *
  10  * This file is part of wimlib, a library for working with WIM files.
  11  *
  12  * wimlib is free software; you can redistribute it and/or modify it under the
  13  * terms of the GNU General Public License as published by the Free
  14  * Software Foundation; either version 3 of the License, or (at your option)
  15  * any later version.
  16  *
  17  * wimlib is distributed in the hope that it will be useful, but WITHOUT ANY
  18  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
  19  * A PARTICULAR PURPOSE. See the GNU General Public License for more
  20  * details.
  21  *
  22  * You should have received a copy of the GNU General Public License
  23  * along with wimlib; if not, see http://www.gnu.org/licenses/.
  24  */
  25
  26 #ifdef HAVE_CONFIG_H
  27 #  include "config.h"
  28 #endif
  29
  30 #include "wimlib.h"
  31 #include "wimlib/error.h"
  32 #include "wimlib/glob.h"
  33 #include "wimlib/lookup_table.h"
  34 #include "wimlib/wim.h"
  35
  36 #define WIMLIB_REF_MASK_PUBLIC (WIMLIB_REF_FLAG_GLOB_ENABLE | \
  37                                 WIMLIB_REF_FLAG_GLOB_ERR_ON_NOMATCH)
  38
  39 #define WIMLIB_REF_FLAG_GIFT 0x80000000
  40
  41 struct lookup_tables {
  42         struct wim_lookup_table *src_table;
  43         struct wim_lookup_table *dest_table;
  44 };
  45
  46 static int
  47 lte_gift(struct wim_lookup_table_entry *lte, void *_tables)
  48 {
  49         struct lookup_tables *tables = _tables;
  50         struct wim_lookup_table *src_table = tables->src_table;
  51         struct wim_lookup_table *dest_table = tables->dest_table;
  52
  53         lookup_table_unlink(src_table, lte);
  54         if (lookup_stream(dest_table, lte->hash)) {
  55                 free_lookup_table_entry(lte);
  56         } else {
  57                 lte->out_refcnt = 1;
  58                 lookup_table_insert(dest_table, lte);
  59         }
  60         return 0;
  61 }
  62
  63 static int
  64 lte_clone_if_new(struct wim_lookup_table_entry *lte, void *_lookup_table)
  65 {
  66         struct wim_lookup_table *lookup_table = _lookup_table;
  67
  68         if (lookup_stream(lookup_table, lte->hash))
  69                 return 0;  /*  Resource already present.  */
  70
  71         lte = clone_lookup_table_entry(lte);
  72         if (lte == NULL)
  73                 return WIMLIB_ERR_NOMEM;
  74         lte->out_refcnt = 1;
  75         lookup_table_insert(lookup_table, lte);
  76         return 0;
  77 }
  78
  79 static int
  80 lte_delete_if_new(struct wim_lookup_table_entry *lte, void *_lookup_table)
  81 {
  82         struct wim_lookup_table *lookup_table = _lookup_table;
  83
  84         if (lte->out_refcnt) {
  85                 lookup_table_unlink(lookup_table, lte);
  86                 free_lookup_table_entry(lte);
  87         }
  88         return 0;
  89 }
  90
  91 static int
  92 do_wimlib_reference_resources(WIMStruct *wim, WIMStruct **resource_wims,
  93                               unsigned num_resource_wims, int ref_flags)
  94 {
  95         unsigned i;
  96         int ret;
  97
  98         if (ref_flags & WIMLIB_REF_FLAG_GIFT) {
  99                 struct lookup_tables tables;
 100
 101                 tables.dest_table = wim->lookup_table;
 102
 103                 for (i = 0; i < num_resource_wims; i++) {
 104
 105                         tables.src_table = resource_wims[i]->lookup_table;
 106
 107                         ret = for_lookup_table_entry(resource_wims[i]->lookup_table,
 108                                                      lte_gift, &tables);
 109                         if (ret)
 110                                 goto out_rollback;
 111                 }
 112         } else {
 113                 for (i = 0; i < num_resource_wims; i++) {
 114                         ret = for_lookup_table_entry(resource_wims[i]->lookup_table,
 115                                                      lte_clone_if_new, wim->lookup_table);
 116                         if (ret)
 117                                 goto out_rollback;
 118                 }
 119         }
 120         return 0;
 121
 122 out_rollback:
 123         for_lookup_table_entry(wim->lookup_table, lte_delete_if_new,
 124                                wim->lookup_table);
 125         return ret;
 126 }
 127
 128 /* API function documented in wimlib.h  */
 129 WIMLIBAPI int
 130 wimlib_reference_resources(WIMStruct *wim,
 131                            WIMStruct **resource_wims, unsigned num_resource_wims,
 132                            int ref_flags)
 133 {
 134         unsigned i;
 135
 136         if (wim == NULL)
 137                 return WIMLIB_ERR_INVALID_PARAM;
 138
 139         if (num_resource_wims != 0 && resource_wims == NULL)
 140                 return WIMLIB_ERR_INVALID_PARAM;
 141
 142         if (ref_flags & ~WIMLIB_REF_MASK_PUBLIC)
 143                 return WIMLIB_ERR_INVALID_PARAM;
 144
 145         for (i = 0; i < num_resource_wims; i++)
 146                 if (resource_wims[i] == NULL)
 147                         return WIMLIB_ERR_INVALID_PARAM;
 148
 149         return do_wimlib_reference_resources(wim, resource_wims,
 150                                              num_resource_wims, ref_flags);
 151 }
 152
 153 static int
 154 reference_resource_paths(WIMStruct *wim,
 155                          const tchar * const *resource_wimfiles,
 156                          unsigned num_resource_wimfiles,
 157                          int ref_flags,
 158                          int open_flags)
 159 {
 160         WIMStruct **resource_wims;
 161         unsigned i;
 162         int ret;
 163
 164         resource_wims = CALLOC(num_resource_wimfiles, sizeof(resource_wims[0]));
 165         if (!resource_wims)
 166                 return WIMLIB_ERR_NOMEM;
 167
 168         for (i = 0; i < num_resource_wimfiles; i++) {
 169                 DEBUG("Referencing resources from path \"%"TS"\"",
 170                       resource_wimfiles[i]);
 171                 ret = wimlib_open_wim_with_progress(resource_wimfiles[i],
 172                                                     open_flags,
 173                                                     &resource_wims[i],
 174                                                     wim->progfunc,
 175                                                     wim->progctx);
 176                 if (ret)
 177                         goto out_free_resource_wims;
 178         }
 179
 180         ret = do_wimlib_reference_resources(wim, resource_wims,
 181                                             num_resource_wimfiles,
 182                                             ref_flags | WIMLIB_REF_FLAG_GIFT);
 183         if (ret)
 184                 goto out_free_resource_wims;
 185
 186         for (i = 0; i < num_resource_wimfiles; i++)
 187                 list_add_tail(&resource_wims[i]->subwim_node, &wim->subwims);
 188
 189         ret = 0;
 190         goto out_free_array;
 191
 192 out_free_resource_wims:
 193         for (i = 0; i < num_resource_wimfiles; i++)
 194                 wimlib_free(resource_wims[i]);
 195 out_free_array:
 196         FREE(resource_wims);
 197         return ret;
 198 }
 199
 200 static int
 201 reference_resource_glob(WIMStruct *wim, const tchar *refglob,
 202                         int ref_flags, int open_flags)
 203 {
 204         glob_t globbuf;
 205         int ret;
 206
 207         /* Note: glob() is replaced in Windows native builds.  */
 208         ret = tglob(refglob, GLOB_ERR | GLOB_NOSORT, NULL, &globbuf);
 209         if (ret) {
 210                 if (ret == GLOB_NOMATCH) {
 211                         if (ref_flags & WIMLIB_REF_FLAG_GLOB_ERR_ON_NOMATCH) {
 212                                 ERROR("Found no files for glob \"%"TS"\"", refglob);
 213                                 return WIMLIB_ERR_GLOB_HAD_NO_MATCHES;
 214                         } else {
 215                                 return reference_resource_paths(wim,
 216                                                                 &refglob,
 217                                                                 1,
 218                                                                 ref_flags,
 219                                                                 open_flags);
 220                         }
 221                 } else {
 222                         ERROR_WITH_ERRNO("Failed to process glob \"%"TS"\"", refglob);
 223                         if (ret == GLOB_NOSPACE)
 224                                 return WIMLIB_ERR_NOMEM;
 225                         else
 226                                 return WIMLIB_ERR_READ;
 227                 }
 228         }
 229
 230         ret = reference_resource_paths(wim,
 231                                        (const tchar * const *)globbuf.gl_pathv,
 232                                        globbuf.gl_pathc,
 233                                        ref_flags,
 234                                        open_flags);
 235         globfree(&globbuf);
 236         return ret;
 237 }
 238
 239 /* API function documented in wimlib.h  */
 240 WIMLIBAPI int
 241 wimlib_reference_resource_files(WIMStruct *wim,
 242                                 const tchar * const * resource_wimfiles_or_globs,
 243                                 unsigned count,
 244                                 int ref_flags,
 245                                 int open_flags)
 246 {
 247         unsigned i;
 248         int ret;
 249
 250         if (ref_flags & ~WIMLIB_REF_MASK_PUBLIC)
 251                 return WIMLIB_ERR_INVALID_PARAM;
 252
 253         if (ref_flags & WIMLIB_REF_FLAG_GLOB_ENABLE) {
 254                 for (i = 0; i < count; i++) {
 255                         ret = reference_resource_glob(wim,
 256                                                       resource_wimfiles_or_globs[i],
 257                                                       ref_flags,
 258                                                       open_flags);
 259                         if (ret)
 260                                 return ret;
 261                 }
 262                 return 0;
 263         } else {
 264                 return reference_resource_paths(wim, resource_wimfiles_or_globs,
 265                                                 count, ref_flags, open_flags);
 266         }
 267 }