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
   7 /*
   8  * Copyright (C) 2012, 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 #include "wimlib_internal.h"
  27 #include "lookup_table.h"
  28 #include "xml.h"
  29 #include <stdlib.h>
  30
  31 static int
  32 move_lte_to_table(struct wim_lookup_table_entry *lte, void *combined_table)
  33 {
  34         hlist_del(&lte->hash_list);
  35         lookup_table_insert((struct wim_lookup_table*)combined_table, lte);
  36         return 0;
  37 }
  38
  39 static void
  40 lookup_table_join(struct wim_lookup_table *combined_table,
  41                   struct wim_lookup_table *part_table)
  42 {
  43         for_lookup_table_entry(part_table, move_lte_to_table, combined_table);
  44         part_table->num_entries = 0;
  45 }
  46
  47 /*
  48  * merge_lookup_tables() - Merge lookup tables from the parts of a split WIM.
  49  *
  50  * @w specifies the first part, while @additional_swms and @num_additional_swms
  51  * specify an array of pointers to the WIMStruct's for additional split WIM parts.
  52  *
  53  * The reason we join the lookup tables is so we only have to search one lookup
  54  * table to find the location of a resource in the entire WIM.
  55  */
  56 void
  57 merge_lookup_tables(WIMStruct *w,
  58                     WIMStruct **additional_swms,
  59                     unsigned num_additional_swms)
  60 {
  61         for (unsigned i = 0; i < num_additional_swms; i++)
  62                 lookup_table_join(w->lookup_table, additional_swms[i]->lookup_table);
  63 }
  64
  65 static int
  66 move_lte_to_orig_table(struct wim_lookup_table_entry *lte, void *_wim)
  67 {
  68         WIMStruct *wim = _wim;
  69         if (lte->wim != wim) {
  70                 move_lte_to_table(lte, lte->wim->lookup_table);
  71                 wim->lookup_table->num_entries--;
  72         }
  73         return 0;
  74 }
  75
  76 /* Undo merge_lookup_tables(), given the first WIM part that contains the merged
  77  * lookup table. */
  78 void
  79 unmerge_lookup_table(WIMStruct *wim)
  80 {
  81         for_lookup_table_entry(wim->lookup_table, move_lte_to_orig_table, wim);
  82 }
  83
  84
  85 static int
  86 join_wims(WIMStruct **swms, unsigned num_swms,
  87           WIMStruct *joined_wim, int write_flags,
  88           wimlib_progress_func_t progress_func)
  89 {
  90         int ret;
  91         unsigned i;
  92         union wimlib_progress_info progress;
  93         u64 total_bytes = 0;
  94         u64 part_bytes;
  95         u64 swm_part_sizes[num_swms];
  96
  97         /* Calculate total size of the streams in the split WIM parts. */
  98         for (i = 0; i < num_swms; i++) {
  99                 part_bytes = lookup_table_total_stream_size(swms[i]->lookup_table);
 100                 swm_part_sizes[i] = part_bytes;
 101                 total_bytes += part_bytes;
 102         }
 103
 104         if (progress_func) {
 105                 progress.join.total_bytes     = total_bytes;
 106                 progress.join.total_parts     = swms[0]->hdr.total_parts;
 107                 progress.join.completed_bytes = 0;
 108                 progress.join.completed_parts = 0;
 109                 progress_func(WIMLIB_PROGRESS_MSG_JOIN_STREAMS, &progress);
 110         }
 111
 112         /* Write the non-metadata resources from each SWM part */
 113         for (i = 0; i < num_swms; i++) {
 114                 ret = reopen_wim(swms[i]);
 115                 if (ret)
 116                         return ret;
 117                 swms[i]->out_fd = joined_wim->out_fd;
 118                 swms[i]->hdr.part_number = 1;
 119
 120                 ret = for_lookup_table_entry_pos_sorted(swms[i]->lookup_table,
 121                                                         copy_resource,
 122                                                         swms[i]);
 123                 swms[i]->out_fd = -1;
 124                 if (i != 0)
 125                         close_wim(swms[i]);
 126
 127                 if (ret)
 128                         return ret;
 129
 130                 if (progress_func) {
 131                         progress.join.completed_bytes += swm_part_sizes[i];
 132                         progress.join.completed_parts++;
 133                         progress_func(WIMLIB_PROGRESS_MSG_JOIN_STREAMS, &progress);
 134                 }
 135         }
 136
 137         /* Copy the metadata resources from the first SWM part */
 138         joined_wim->hdr.image_count = swms[0]->hdr.image_count;
 139         for (i = 0; i < joined_wim->hdr.image_count; i++) {
 140                 ret = copy_resource(swms[0]->image_metadata[i]->metadata_lte,
 141                                     joined_wim);
 142                 if (ret)
 143                         return ret;
 144         }
 145
 146         /* Write lookup table, XML data, and optional integrity table */
 147         for (i = 0; i < num_swms; i++)
 148                 lookup_table_join(joined_wim->lookup_table, swms[i]->lookup_table);
 149
 150         free_wim_info(joined_wim->wim_info);
 151         joined_wim->wim_info = swms[0]->wim_info;
 152         joined_wim->image_metadata = swms[0]->image_metadata;
 153         ret = finish_write(joined_wim, WIMLIB_ALL_IMAGES, write_flags, progress_func);
 154         joined_wim->wim_info = NULL;
 155         joined_wim->image_metadata = NULL;
 156         return ret;
 157 }
 158
 159 static int
 160 cmp_swms_by_part_number(const void *swm1, const void *swm2)
 161 {
 162         u16 partno_1 = (*(const WIMStruct**)swm1)->hdr.part_number;
 163         u16 partno_2 = (*(const WIMStruct**)swm2)->hdr.part_number;
 164         return (int)partno_1 - (int)partno_2;
 165 }
 166
 167 /*
 168  * Join a set of split WIMs into a stand-alone WIM.
 169  */
 170 WIMLIBAPI int
 171 wimlib_join(const tchar * const *swm_names,
 172             unsigned num_swms,
 173             const tchar *output_path,
 174             int swm_open_flags,
 175             int wim_write_flags,
 176             wimlib_progress_func_t progress_func)
 177 {
 178         int ret;
 179         WIMStruct *joined_wim = NULL;
 180         unsigned i;
 181
 182         swm_open_flags |= WIMLIB_OPEN_FLAG_SPLIT_OK;
 183         wim_write_flags &= WIMLIB_WRITE_MASK_PUBLIC;
 184
 185         if (num_swms < 1 || num_swms > 0xffff)
 186                 return WIMLIB_ERR_INVALID_PARAM;
 187
 188         WIMStruct *swms[num_swms];
 189         ZERO_ARRAY(swms);
 190
 191         for (i = 0; i < num_swms; i++) {
 192                 ret = wimlib_open_wim(swm_names[i], swm_open_flags, &swms[i],
 193                                       progress_func);
 194                 if (ret)
 195                         goto out_free_wims;
 196
 197                 /* Don't open all the parts at the same time, in case there are
 198                  * a lot of them */
 199                 close_wim(swms[i]);
 200         }
 201
 202         qsort(swms, num_swms, sizeof(swms[0]), cmp_swms_by_part_number);
 203
 204         ret = verify_swm_set(swms[0], &swms[1], num_swms - 1);
 205         if (ret)
 206                 goto out_free_wims;
 207
 208         ret = wimlib_create_new_wim(wimlib_get_compression_type(swms[0]),
 209                                     &joined_wim);
 210         if (ret)
 211                 goto out_free_wims;
 212
 213         ret = begin_write(joined_wim, output_path, wim_write_flags);
 214         if (ret)
 215                 goto out_free_wims;
 216         ret = join_wims(swms, num_swms, joined_wim, wim_write_flags,
 217                         progress_func);
 218 out_free_wims:
 219         for (i = 0; i < num_swms; i++)
 220                 wimlib_free(swms[i]);
 221         wimlib_free(joined_wim);
 222         return ret;
 223 }