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

   1 /*
   2  * join.c
   3  *
   4  * Join split WIMs (sometimes named as .swm files) together into one WIM.
   5  *
   6  * Copyright (C) 2010 Carl Thijssen
   7  * Copyright (C) 2012 Eric Biggers
   8  *
   9  * wimlib - Library for working with WIM files
  10  *
  11  * This library is free software; you can redistribute it and/or modify it under
  12  * the terms of the GNU Lesser General Public License as published by the Free
  13  * Software Foundation; either version 2.1 of the License, or (at your option) any
  14  * later version.
  15  *
  16  * This library is distributed in the hope that it will be useful, but WITHOUT ANY
  17  * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A
  18  * PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License along
  21  * with this library; if not, write to the Free Software Foundation, Inc., 59
  22  * Temple Place, Suite 330, Boston, MA 02111-1307 USA
  23  */
  24
  25 #include "wimlib.h"
  26 #include "lookup_table.h"
  27 #include "xml.h"
  28
  29 static int join_resource(struct lookup_table_entry *lte, void *split_wim)
  30 {
  31         FILE *split_wim_fp = ((WIMStruct*)split_wim)->fp;
  32         FILE *joined_wim_fp = ((WIMStruct*)split_wim)->out_fp;
  33         int ret;
  34
  35         u64 size = lte->resource_entry.size;
  36         u64 offset = lte->resource_entry.offset;
  37         off_t new_offset = ftello(joined_wim_fp);
  38
  39         if (new_offset == -1)
  40                 return WIMLIB_ERR_WRITE;
  41
  42         ret = copy_between_files(split_wim_fp, offset, joined_wim_fp, size);
  43         if (ret != 0)
  44                 return ret;
  45
  46         memcpy(&lte->output_resource_entry, &lte->resource_entry,
  47                         sizeof(struct resource_entry));
  48
  49         lte->output_resource_entry.offset = new_offset;
  50         lte->out_refcnt = lte->refcnt;
  51         lte->part_number = 1;
  52         return 0;
  53 }
  54
  55 static int join_wims(WIMStruct **swms, uint num_swms, WIMStruct *joined_wim,
  56                      int write_flags)
  57 {
  58         uint i;
  59         int ret;
  60         FILE *out_fp = joined_wim->out_fp;
  61         u64 total_bytes = wim_info_get_total_bytes(swms[0]->wim_info);
  62
  63         /* The following loop writes both file resources and metadata resources
  64          * because it loops over the lookup table entries rather than the dentry
  65          * tree for the images */
  66         for (i = 0; i < num_swms; i++) {
  67                 if (write_flags & WIMLIB_WRITE_FLAG_SHOW_PROGRESS) {
  68                         off_t cur_offset = ftello(out_fp);
  69                         printf("Writing resources from part %u of %u "
  70                                         "(%"PRIu64" of %"PRIu64" bytes, %.2f%% done)\n",
  71                                         i + 1, num_swms,
  72                                         cur_offset, total_bytes,
  73                                         (double)cur_offset / total_bytes * 100.0);
  74                 }
  75                 swms[i]->out_fp = out_fp;
  76                 ret = for_lookup_table_entry(swms[i]->lookup_table,
  77                                              join_resource, swms[i]);
  78                 if (ret != 0)
  79                         return ret;
  80         }
  81
  82         off_t lookup_table_offset = ftello(out_fp);
  83
  84         if (write_flags & WIMLIB_WRITE_FLAG_SHOW_PROGRESS)
  85                 printf("Writing lookup tables, XML data, and header\n");
  86         /* Now write the lookup table for the joined wim.  Since the lookup
  87          * table has no header, we can just concatenate the lookup tables of all
  88          * the SWM parts. */
  89         for (i = 0; i < num_swms; i++) {
  90                 ret = write_lookup_table(swms[i]->lookup_table, out_fp);
  91                 if (ret != 0)
  92                         return ret;
  93         }
  94         off_t xml_data_offset = ftello(out_fp);
  95
  96         if (lookup_table_offset == -1 || xml_data_offset == -1) {
  97                 ERROR("Failed to get file offset: %m\n");
  98                 return WIMLIB_ERR_WRITE;
  99         }
 100         swms[0]->hdr.lookup_table_res_entry.offset = lookup_table_offset;
 101         swms[0]->hdr.lookup_table_res_entry.size =
 102                                         xml_data_offset - lookup_table_offset;
 103
 104         swms[0]->hdr.flags &= ~WIM_HDR_FLAG_SPANNED;
 105
 106         /* finish_write is called on the first swm, not the joined_wim, because
 107          * the first swm is the one that has the image metadata and XML data
 108          * attached to it.  */
 109         return finish_write(swms[0], WIM_ALL_IMAGES, write_flags, 0);
 110 }
 111
 112
 113 WIMLIBAPI int wimlib_join(const char **swm_names, int num_swms,
 114                           const char *output_path, int flags)
 115 {
 116         int i;
 117         int ret;
 118         int part_idx;
 119         int write_flags = 0;
 120         WIMStruct *w;
 121         WIMStruct *joined_wim = NULL;
 122         WIMStruct *swms[num_swms];
 123
 124         /* keep track of ctype and guid just to make sure they are the same for
 125          * all the WIMs. */
 126         int ctype;
 127         u8 *guid;
 128
 129         ZERO_ARRAY(swms);
 130         for (i = 0; i < num_swms; i++) {
 131                 ret = wimlib_open_wim(swm_names[i],
 132                                       flags | WIMLIB_OPEN_FLAG_SPLIT_OK, &w);
 133                 if (ret != 0)
 134                         goto err;
 135
 136                 if (i == 0) {
 137                         ctype = wimlib_get_compression_type(w);
 138                         guid = w->hdr.guid;
 139                 } else {
 140                         if (wimlib_get_compression_type(w) != ctype) {
 141                                 ERROR("The split WIMs do not all have the same "
 142                                                 "compression type!\n");
 143                                 ret = WIMLIB_ERR_SPLIT_INVALID;
 144                                 goto err;
 145                         }
 146                         if (memcmp(guid, w->hdr.guid, WIM_GID_LEN) != 0) {
 147                                 ERROR("The split WIMs do not all have the "
 148                                                 "same GUID!\n");
 149                                 ret = WIMLIB_ERR_SPLIT_INVALID;
 150                                 goto err;
 151                         }
 152                 }
 153                 if (w->hdr.total_parts != num_swms) {
 154                         ERROR("`%s' (part %d) says there are %d total parts,\n"
 155                                         "but %d parts were specified!\n",
 156                                         swm_names[i], w->hdr.part_number,
 157                                         w->hdr.total_parts, num_swms);
 158                         ret = WIMLIB_ERR_SPLIT_INVALID;
 159                         goto err;
 160                 }
 161                 if (w->hdr.part_number == 0 || w->hdr.part_number > num_swms) {
 162                         ERROR("`%s' says it is part %d, but expected a number\n"
 163                                         "between 1 and %d!\n",
 164                                 swm_names[i], w->hdr.part_number, num_swms);
 165                         ret = WIMLIB_ERR_SPLIT_INVALID;
 166                         goto err;
 167                 }
 168                 part_idx = w->hdr.part_number - 1;
 169                 if (swms[part_idx] != NULL) {
 170                         ERROR("`%s' and `%s' both say they are part %d of %d!\n",
 171                                 swm_names[i], swms[part_idx]->filename,
 172                                 w->hdr.part_number, num_swms);
 173                         ret = WIMLIB_ERR_SPLIT_INVALID;
 174                         goto err;
 175                 }
 176                 swms[part_idx] = w;
 177
 178         }
 179         joined_wim = new_wim_struct();
 180         if (!joined_wim) {
 181                 ret = WIMLIB_ERR_NOMEM;
 182                 goto err;
 183         }
 184
 185         if (flags & WIMLIB_OPEN_FLAG_CHECK_INTEGRITY)
 186                 write_flags |= WIMLIB_WRITE_FLAG_CHECK_INTEGRITY;
 187         if (flags & WIMLIB_OPEN_FLAG_SHOW_PROGRESS)
 188                 write_flags |= WIMLIB_WRITE_FLAG_SHOW_PROGRESS;
 189
 190         ret = begin_write(joined_wim, output_path, write_flags);
 191         if (ret != 0)
 192                 goto err;
 193         ret = join_wims(swms, num_swms, joined_wim, write_flags);
 194 err:
 195         for (i = 0; i < num_swms; i++) {
 196                 /* out_fp is the same in all the swms and joined_wim; only close
 197                  * it one time, when freeing joined_wim. */
 198                 swms[i]->out_fp = NULL;
 199                 wimlib_free(swms[i]);
 200         }
 201         wimlib_free(joined_wim);
 202         return ret;
 203 }