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   1 /*
   2  * split.c
   3  *
   4  * Split a WIM file into parts.
   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 #ifdef HAVE_CONFIG_H
  27 #  include "config.h"
  28 #endif
  29
  30 #include "wimlib.h"
  31 #include "wimlib/endianness.h"
  32 #include "wimlib/error.h"
  33 #include "wimlib/file_io.h"
  34 #include "wimlib/lookup_table.h"
  35 #include "wimlib/metadata.h"
  36 #include "wimlib/types.h"
  37 #include "wimlib/write.h"
  38 #include "wimlib/list.h"
  39
  40 #include <fcntl.h> /* for open() */
  41 #include <unistd.h> /* for close() */
  42
  43 struct split_args {
  44         WIMStruct *wim;
  45         tchar *swm_base_name;
  46         size_t swm_base_name_len;
  47         const tchar *swm_suffix;
  48         struct list_head lte_list;
  49         int cur_part_number;
  50         int write_flags;
  51         s64 size_remaining;
  52         size_t part_size;
  53         wimlib_progress_func_t progress_func;
  54         union wimlib_progress_info progress;
  55 };
  56
  57 static int
  58 finish_swm(WIMStruct *wim, struct list_head *lte_list,
  59            int write_flags, wimlib_progress_func_t progress_func)
  60 {
  61         int ret;
  62
  63         ret = write_lookup_table_from_stream_list(lte_list, wim->out_fd,
  64                                                   &wim->hdr.lookup_table_res_entry);
  65         if (ret)
  66                 return ret;
  67         return finish_write(wim, WIMLIB_ALL_IMAGES,
  68                             write_flags | WIMLIB_WRITE_FLAG_NO_LOOKUP_TABLE,
  69                             progress_func);
  70 }
  71
  72 static int
  73 copy_resource_to_swm(struct wim_lookup_table_entry *lte, void *_args)
  74 {
  75         struct split_args *args = (struct split_args*)_args;
  76         WIMStruct *wim = args->wim;
  77         int ret;
  78
  79         if (args->size_remaining < 0 ||
  80                         (u64)args->size_remaining < lte->resource_entry.size) {
  81
  82                 /* No space for this resource.  Finish the previous swm and
  83                  * start a new one. */
  84
  85                 ret = finish_swm(wim, &args->lte_list, args->write_flags,
  86                                  args->progress_func);
  87                 if (ret)
  88                         return ret;
  89
  90                 if (args->progress_func) {
  91                         args->progress_func(WIMLIB_PROGRESS_MSG_SPLIT_END_PART,
  92                                             &args->progress);
  93                 }
  94
  95                 INIT_LIST_HEAD(&args->lte_list);
  96                 args->cur_part_number++;
  97
  98                 tsprintf(args->swm_base_name + args->swm_base_name_len, T("%d%"TS),
  99                          args->cur_part_number, args->swm_suffix);
 100
 101                 wim->hdr.part_number = args->cur_part_number;
 102
 103                 if (args->progress_func) {
 104                         args->progress.split.cur_part_number = args->cur_part_number;
 105                         args->progress_func(WIMLIB_PROGRESS_MSG_SPLIT_BEGIN_PART,
 106                                             &args->progress);
 107                 }
 108
 109                 ret = begin_write(wim, args->swm_base_name, args->write_flags);
 110                 if (ret)
 111                         return ret;
 112                 args->size_remaining = args->part_size;
 113         }
 114         args->size_remaining -= lte->resource_entry.size;
 115         args->progress.split.completed_bytes += lte->resource_entry.size;
 116         list_add_tail(&lte->swm_stream_list, &args->lte_list);
 117         return copy_resource(lte, wim);
 118 }
 119
 120 /* Splits the WIM file @wim into multiple parts prefixed by @swm_name with size
 121  * at most @part_size bytes. */
 122 WIMLIBAPI int
 123 wimlib_split(WIMStruct *wim, const tchar *swm_name,
 124              size_t part_size, int write_flags,
 125              wimlib_progress_func_t progress_func)
 126 {
 127         int ret;
 128         struct wim_header hdr_save;
 129         struct split_args args;
 130         const tchar *swm_suffix;
 131         size_t swm_name_len;
 132         size_t swm_base_name_len;
 133
 134         if (!swm_name || part_size == 0)
 135                 return WIMLIB_ERR_INVALID_PARAM;
 136
 137         if (wim->hdr.total_parts != 1)
 138                 return WIMLIB_ERR_SPLIT_UNSUPPORTED;
 139
 140         write_flags &= WIMLIB_WRITE_MASK_PUBLIC;
 141
 142         swm_name_len = tstrlen(swm_name);
 143         tchar swm_base_name[swm_name_len + 20];
 144
 145         memcpy(&hdr_save, &wim->hdr, sizeof(struct wim_header));
 146         wim->hdr.flags |= WIM_HDR_FLAG_SPANNED;
 147         wim->hdr.boot_idx = 0;
 148         randomize_byte_array(wim->hdr.guid, WIM_GID_LEN);
 149         ret = begin_write(wim, swm_name, write_flags);
 150         if (ret)
 151                 goto out;
 152
 153         tmemcpy(swm_base_name, swm_name, swm_name_len + 1);
 154
 155         swm_suffix = tstrchr(swm_name, T('.'));
 156         if (swm_suffix) {
 157                 swm_base_name_len = swm_suffix - swm_name;
 158         } else {
 159                 swm_base_name_len = swm_name_len;
 160                 swm_base_name[ARRAY_LEN(swm_base_name) - 1] = T('\0');
 161                 swm_suffix = &swm_base_name[ARRAY_LEN(swm_base_name) - 1];
 162         }
 163
 164         args.wim                              = wim;
 165         args.swm_base_name                  = swm_base_name;
 166         args.swm_base_name_len              = swm_base_name_len;
 167         args.swm_suffix                     = swm_suffix;
 168         INIT_LIST_HEAD(&args.lte_list);
 169         args.cur_part_number                = 1;
 170         args.write_flags                    = write_flags;
 171         args.size_remaining                 = part_size;
 172         args.part_size                      = part_size;
 173         args.progress_func                  = progress_func;
 174         args.progress.split.total_bytes     = lookup_table_total_stream_size(wim->lookup_table);
 175         args.progress.split.cur_part_number = 1;
 176         args.progress.split.completed_bytes = 0;
 177         args.progress.split.part_name       = swm_base_name;
 178
 179         if (progress_func) {
 180                 progress_func(WIMLIB_PROGRESS_MSG_SPLIT_BEGIN_PART,
 181                               &args.progress);
 182         }
 183
 184         for (int i = 0; i < wim->hdr.image_count; i++) {
 185                 struct wim_lookup_table_entry *metadata_lte;
 186                 metadata_lte = wim->image_metadata[i]->metadata_lte;
 187                 ret = copy_resource(metadata_lte, wim);
 188                 if (ret)
 189                         goto out;
 190                 args.size_remaining -= metadata_lte->resource_entry.size;
 191                 args.progress.split.completed_bytes += metadata_lte->resource_entry.size;
 192                 /* Careful: The metadata lookup table entries must be added in
 193                  * order of the images. */
 194                 list_add_tail(&metadata_lte->swm_stream_list, &args.lte_list);
 195         }
 196
 197         ret = for_lookup_table_entry_pos_sorted(wim->lookup_table,
 198                                                 copy_resource_to_swm,
 199                                                 &args);
 200         if (ret)
 201                 goto out;
 202
 203         ret = finish_swm(wim, &args.lte_list, write_flags, progress_func);
 204         if (ret)
 205                 goto out;
 206
 207         if (progress_func) {
 208                 progress_func(WIMLIB_PROGRESS_MSG_SPLIT_END_PART,
 209                               &args.progress);
 210         }
 211
 212         /* The swms are all ready now, except the total_parts and part_number
 213          * fields in their headers are wrong (since we don't know the total
 214          * parts until they are all written).  Fix them. */
 215         int total_parts = args.cur_part_number;
 216         for (int i = 1; i <= total_parts; i++) {
 217                 const tchar *part_name;
 218                 int part_fd;
 219                 int ret2;
 220
 221                 if (i == 1) {
 222                         part_name = swm_name;
 223                 } else {
 224                         tsprintf(swm_base_name + swm_base_name_len, T("%d%"TS),
 225                                  i, swm_suffix);
 226                         part_name = swm_base_name;
 227                 }
 228
 229                 part_fd = topen(part_name, O_WRONLY | O_BINARY);
 230                 if (part_fd == -1) {
 231                         ERROR_WITH_ERRNO("Failed to open `%"TS"'", part_name);
 232                         ret = WIMLIB_ERR_OPEN;
 233                         goto out;
 234                 }
 235
 236                 ret = write_header_part_data(i, total_parts, part_fd);
 237                 ret2 = close(part_fd);
 238                 if (ret == 0 && ret2 != 0)
 239                         ret = WIMLIB_ERR_WRITE;
 240                 if (ret) {
 241                         ERROR_WITH_ERRNO("Error updating header of `%"TS"'",
 242                                          part_name);
 243                         goto out;
 244                 }
 245         }
 246         ret = 0;
 247 out:
 248         close_wim_writable(wim);
 249         memcpy(&wim->hdr, &hdr_save, sizeof(struct wim_header));
 250         return ret;
 251 }