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   1 /*
   2  * join.c
   3  *
   4  * Join split WIMs (sometimes named as .swm files) together into one WIM.
   5  */
   6
   7 /*
   8  * Copyright (C) 2012 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 Lesser General Public License as published by the Free
  14  * Software Foundation; either version 2.1 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 Lesser General Public License for more
  20  * details.
  21  *
  22  * You should have received a copy of the GNU Lesser General Public License
  23  * along with wimlib; if not, see http://www.gnu.org/licenses/.
  24  */
  25
  26 #include "wimlib_internal.h"
  27 #include "lookup_table.h"
  28 #include "xml.h"
  29
  30 static int join_wims(WIMStruct **swms, uint num_swms, WIMStruct *joined_wim,
  31                      int write_flags)
  32 {
  33         uint i;
  34         int ret;
  35         FILE *out_fp = joined_wim->out_fp;
  36         u64 total_bytes = wim_info_get_total_bytes(swms[0]->wim_info);
  37
  38         swms[0]->write_metadata = false;
  39         for (i = 0; i < num_swms; i++) {
  40                 if (write_flags & WIMLIB_WRITE_FLAG_SHOW_PROGRESS) {
  41                         off_t cur_offset = ftello(out_fp);
  42                         printf("Writing resources from part %u of %u "
  43                                         "(%"PRIu64" of %"PRIu64" bytes, %.0f%% done)\n",
  44                                         i + 1, num_swms,
  45                                         cur_offset, total_bytes,
  46                                         (double)cur_offset / total_bytes * 100.0);
  47                 }
  48                 swms[i]->fp = fopen(swms[i]->filename, "rb");
  49                 if (!swms[i]->fp) {
  50                         ERROR("Failed to reopen `%s': %m\n", swms[i]->filename);
  51                         return WIMLIB_ERR_OPEN;
  52                 }
  53                 swms[i]->out_fp = out_fp;
  54                 swms[i]->hdr.part_number = 1;
  55                 ret = for_lookup_table_entry(swms[i]->lookup_table,
  56                                              copy_resource, swms[i]);
  57                 if (ret != 0)
  58                         return ret;
  59                 if (i != 0) {
  60                         fclose(swms[i]->fp);
  61                         swms[i]->fp = NULL;
  62                 }
  63         }
  64         swms[0]->write_metadata = true;
  65         if (write_flags & WIMLIB_WRITE_FLAG_SHOW_PROGRESS)
  66                 printf("Writing %d metadata resources\n",
  67                         swms[0]->hdr.image_count);
  68
  69         for (i = 0; i < swms[0]->hdr.image_count; i++) {
  70                 ret = copy_resource(swms[0]->image_metadata[i].lookup_table_entry,
  71                                     swms[0]);
  72                 if (ret != 0)
  73                         return ret;
  74         }
  75
  76         off_t lookup_table_offset = ftello(out_fp);
  77
  78         if (write_flags & WIMLIB_WRITE_FLAG_SHOW_PROGRESS)
  79                 printf("Writing lookup tables, XML data, and header\n");
  80         /* Now write the lookup table for the joined wim.  Since the lookup
  81          * table has no header, we can just concatenate the lookup tables of all
  82          * the SWM parts. */
  83         for (i = 0; i < num_swms; i++) {
  84                 ret = write_lookup_table(swms[i]->lookup_table, out_fp);
  85                 if (ret != 0)
  86                         return ret;
  87         }
  88         off_t xml_data_offset = ftello(out_fp);
  89
  90         if (lookup_table_offset == -1 || xml_data_offset == -1) {
  91                 ERROR("Failed to get file offset: %m\n");
  92                 return WIMLIB_ERR_WRITE;
  93         }
  94         swms[0]->hdr.lookup_table_res_entry.offset = lookup_table_offset;
  95         swms[0]->hdr.lookup_table_res_entry.size =
  96                                         xml_data_offset - lookup_table_offset;
  97
  98
  99         /* finish_write is called on the first swm, not the joined_wim, because
 100          * the first swm is the one that has the image metadata and XML data
 101          * attached to it.  */
 102         swms[0]->hdr.flags &= ~WIM_HDR_FLAG_SPANNED;
 103         swms[0]->hdr.total_parts = 1;
 104         return finish_write(swms[0], WIM_ALL_IMAGES, write_flags, 0);
 105 }
 106
 107
 108 WIMLIBAPI int wimlib_join(const char **swm_names, int num_swms,
 109                           const char *output_path, int flags)
 110 {
 111         int i;
 112         int ret;
 113         int part_idx;
 114         int write_flags = 0;
 115         WIMStruct *w;
 116         WIMStruct *joined_wim = NULL;
 117         WIMStruct *swms[num_swms];
 118
 119         /* keep track of ctype and guid just to make sure they are the same for
 120          * all the WIMs. */
 121         int ctype;
 122         u8 *guid;
 123
 124         ZERO_ARRAY(swms);
 125         for (i = 0; i < num_swms; i++) {
 126                 ret = wimlib_open_wim(swm_names[i],
 127                                       flags | WIMLIB_OPEN_FLAG_SPLIT_OK, &w);
 128                 if (ret != 0)
 129                         goto err;
 130
 131                 /* don't open all the parts at the same time, in case there are
 132                  * a lot af them */
 133                 fclose(w->fp);
 134                 w->fp = NULL;
 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, "
 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                 if (swms[i]) {
 199                         swms[i]->out_fp = NULL;
 200                         wimlib_free(swms[i]);
 201                 }
 202         }
 203         wimlib_free(joined_wim);
 204         return ret;
 205 }