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