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

   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 #include "wimlib_internal.h"
  27 #include "lookup_table.h"
  28 #include "xml.h"
  29 #include "buffer_io.h"
  30
  31 #if TCHAR_IS_UTF16LE
  32 #  include <wchar.h>
  33 #endif
  34
  35 struct split_args {
  36         WIMStruct *w;
  37         tchar *swm_base_name;
  38         size_t swm_base_name_len;
  39         const tchar *swm_suffix;
  40         struct list_head lte_list;
  41         int cur_part_number;
  42         int write_flags;
  43         long size_remaining;
  44         size_t part_size;
  45         wimlib_progress_func_t progress_func;
  46         union wimlib_progress_info progress;
  47 };
  48
  49 static int
  50 finish_swm(WIMStruct *w, struct list_head *lte_list,
  51            int write_flags, wimlib_progress_func_t progress_func)
  52 {
  53         off_t lookup_table_offset = ftello(w->out_fp);
  54         int ret;
  55         struct wim_lookup_table_entry *lte;
  56
  57         list_for_each_entry(lte, lte_list, staging_list) {
  58                 ret = write_lookup_table_entry(lte, w->out_fp);
  59                 if (ret != 0)
  60                         return ret;
  61         }
  62
  63         off_t xml_data_offset = ftello(w->out_fp);
  64
  65         if (lookup_table_offset == -1 || xml_data_offset == -1)
  66                 return WIMLIB_ERR_WRITE;
  67         w->hdr.lookup_table_res_entry.offset = lookup_table_offset;
  68         w->hdr.lookup_table_res_entry.size =
  69                                 xml_data_offset - lookup_table_offset;
  70         w->hdr.lookup_table_res_entry.original_size =
  71                                 xml_data_offset - lookup_table_offset;
  72         w->hdr.lookup_table_res_entry.flags = WIM_RESHDR_FLAG_METADATA;
  73         return finish_write(w, WIMLIB_ALL_IMAGES,
  74                             write_flags | WIMLIB_WRITE_FLAG_NO_LOOKUP_TABLE,
  75                             progress_func);
  76 }
  77
  78 static int
  79 copy_resource_to_swm(struct wim_lookup_table_entry *lte, void *__args)
  80 {
  81         struct split_args *args = (struct split_args*)__args;
  82         WIMStruct *w = args->w;
  83         int ret;
  84
  85         /* metadata resources were already written. */
  86         if (lte->resource_entry.flags & WIM_RESHDR_FLAG_METADATA)
  87                 return 0;
  88
  89         if (args->size_remaining < 0 ||
  90                         (u64)args->size_remaining < lte->resource_entry.size) {
  91
  92                 /* No space for this resource.  Finish the previous swm and
  93                  * start a new one. */
  94
  95                 ret = finish_swm(w, &args->lte_list, args->write_flags,
  96                                  args->progress_func);
  97                 if (ret != 0)
  98                         return ret;
  99
 100                 if (args->progress_func) {
 101                         args->progress_func(WIMLIB_PROGRESS_MSG_SPLIT_END_PART,
 102                                             &args->progress);
 103                 }
 104
 105                 INIT_LIST_HEAD(&args->lte_list);
 106                 args->cur_part_number++;
 107
 108                 tsprintf(args->swm_base_name + args->swm_base_name_len, T("%d%"TS),
 109                          args->cur_part_number, args->swm_suffix);
 110
 111                 w->hdr.part_number = args->cur_part_number;
 112
 113                 if (args->progress_func) {
 114                         args->progress.split.cur_part_number = args->cur_part_number;
 115                         args->progress_func(WIMLIB_PROGRESS_MSG_SPLIT_BEGIN_PART,
 116                                             &args->progress);
 117                 }
 118
 119                 ret = begin_write(w, args->swm_base_name, args->write_flags);
 120                 if (ret != 0)
 121                         return ret;
 122                 args->size_remaining = args->part_size;
 123         }
 124         args->size_remaining -= lte->resource_entry.size;
 125         args->progress.split.completed_bytes += lte->resource_entry.size;
 126         list_add(&lte->staging_list, &args->lte_list);
 127         return copy_resource(lte, w);
 128 }
 129
 130 /* Splits the WIM file @w into multiple parts prefixed by @swm_name with size at
 131  * most @part_size bytes. */
 132 WIMLIBAPI int
 133 wimlib_split(WIMStruct *w, const tchar *swm_name,
 134              size_t part_size, int write_flags,
 135              wimlib_progress_func_t progress_func)
 136 {
 137         int ret;
 138         struct wim_header hdr_save;
 139         struct split_args args;
 140         const tchar *swm_suffix;
 141         size_t swm_name_len;
 142         size_t swm_base_name_len;
 143
 144         if (!swm_name || part_size == 0)
 145                 return WIMLIB_ERR_INVALID_PARAM;
 146
 147         if (w->hdr.total_parts != 1)
 148                 return WIMLIB_ERR_SPLIT_UNSUPPORTED;
 149
 150         write_flags &= WIMLIB_WRITE_MASK_PUBLIC;
 151
 152         swm_name_len = tstrlen(swm_name);
 153         tchar swm_base_name[swm_name_len + 20];
 154
 155         memcpy(&hdr_save, &w->hdr, sizeof(struct wim_header));
 156         w->hdr.flags |= WIM_HDR_FLAG_SPANNED;
 157         w->hdr.boot_idx = 0;
 158         randomize_byte_array(w->hdr.guid, WIM_GID_LEN);
 159         ret = begin_write(w, swm_name, write_flags);
 160         if (ret != 0)
 161                 goto out;
 162
 163         tmemcpy(swm_base_name, swm_name, swm_name_len + 1);
 164
 165         swm_suffix = tstrchr(swm_name, T('.'));
 166         if (swm_suffix) {
 167                 swm_base_name_len = swm_suffix - swm_name;
 168         } else {
 169                 swm_base_name_len = swm_name_len;
 170                 swm_base_name[ARRAY_LEN(swm_base_name) - 1] = T('\0');
 171                 swm_suffix = &swm_base_name[ARRAY_LEN(swm_base_name) - 1];
 172         }
 173
 174         args.w                              = w;
 175         args.swm_base_name                  = swm_base_name;
 176         args.swm_base_name_len              = swm_base_name_len;
 177         args.swm_suffix                     = swm_suffix;
 178         INIT_LIST_HEAD(&args.lte_list);
 179         args.cur_part_number                = 1;
 180         args.write_flags                    = write_flags;
 181         args.size_remaining                 = part_size;
 182         args.part_size                      = part_size;
 183         args.progress_func                  = progress_func;
 184         args.progress.split.total_bytes     = lookup_table_total_stream_size(w->lookup_table);
 185         args.progress.split.cur_part_number = 1;
 186         args.progress.split.completed_bytes = 0;
 187         args.progress.split.part_name       = swm_base_name;
 188
 189         if (progress_func) {
 190                 progress_func(WIMLIB_PROGRESS_MSG_SPLIT_BEGIN_PART,
 191                               &args.progress);
 192         }
 193
 194         w->write_metadata = true;
 195         for (int i = 0; i < w->hdr.image_count; i++) {
 196                 struct wim_lookup_table_entry *metadata_lte;
 197                 metadata_lte = w->image_metadata[i].metadata_lte;
 198                 ret = copy_resource(metadata_lte, w);
 199                 if (ret != 0)
 200                         goto out;
 201                 args.size_remaining -= metadata_lte->resource_entry.size;
 202                 args.progress.split.completed_bytes += metadata_lte->resource_entry.size;
 203                 list_add(&metadata_lte->staging_list, &args.lte_list);
 204         }
 205         w->write_metadata = false;
 206
 207         ret = for_lookup_table_entry(w->lookup_table,
 208                                      copy_resource_to_swm, &args);
 209         if (ret != 0)
 210                 goto out;
 211
 212         ret = finish_swm(w, &args.lte_list, write_flags, progress_func);
 213         if (ret != 0)
 214                 goto out;
 215
 216         if (progress_func) {
 217                 progress_func(WIMLIB_PROGRESS_MSG_SPLIT_END_PART,
 218                               &args.progress);
 219         }
 220
 221         /* The swms are all ready now, except the total_parts and part_number
 222          * fields in their headers are wrong (since we don't know the total
 223          * parts until they are all written).  Fix them. */
 224         int total_parts = args.cur_part_number;
 225         for (int i = 1; i <= total_parts; i++) {
 226                 const tchar *part_name;
 227                 if (i == 1) {
 228                         part_name = swm_name;
 229                 } else {
 230                         tsprintf(swm_base_name + swm_base_name_len, T("%d%"TS),
 231                                  i, swm_suffix);
 232                         part_name = swm_base_name;
 233                 }
 234
 235                 FILE *fp = tfopen(part_name, T("r+b"));
 236                 if (!fp) {
 237                         ERROR_WITH_ERRNO("Failed to open `%"TS"'", part_name);
 238                         ret = WIMLIB_ERR_OPEN;
 239                         goto out;
 240                 }
 241                 u8 buf[4];
 242                 put_u16(&buf[0], i);
 243                 put_u16(&buf[2], total_parts);
 244
 245                 if (fseek(fp, 40, SEEK_SET) != 0 ||
 246                     fwrite(buf, 1, sizeof(buf), fp) != sizeof(buf) ||
 247                     fclose(fp) != 0)
 248                 {
 249                         ERROR_WITH_ERRNO("Error overwriting header of `%"TS"'",
 250                                          part_name);
 251                         ret = WIMLIB_ERR_WRITE;
 252                         break;
 253                 }
 254         }
 255 out:
 256         close_wim_writable(w);
 257         memcpy(&w->hdr, &hdr_save, sizeof(struct wim_header));
 258         return ret;
 259 }