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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 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 3 of the License, or (at your option) any
  13  * later version.
  14  *
  15  * This file is distributed in the hope that it will be useful, but WITHOUT
  16  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  17  * FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more
  18  * details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with this file; if not, see http://www.gnu.org/licenses/.
  22  */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #  include "config.h"
  26 #endif
  27
  28 #include "wimlib.h"
  29 #include "wimlib/alloca.h"
  30 #include "wimlib/blob_table.h"
  31 #include "wimlib/error.h"
  32 #include "wimlib/list.h"
  33 #include "wimlib/metadata.h"
  34 #include "wimlib/paths.h"
  35 #include "wimlib/progress.h"
  36 #include "wimlib/resource.h"
  37 #include "wimlib/wim.h"
  38 #include "wimlib/write.h"
  39
  40 struct swm_part_info {
  41         struct list_head blob_list;
  42         u64 size;
  43 };
  44
  45 static void
  46 copy_part_info(struct swm_part_info *dst, struct swm_part_info *src)
  47 {
  48         list_replace(&src->blob_list, &dst->blob_list);
  49         dst->size = src->size;
  50 }
  51
  52 struct swm_info {
  53         struct swm_part_info *parts;
  54         unsigned num_parts;
  55         unsigned num_alloc_parts;
  56         u64 total_bytes;
  57         u64 max_part_size;
  58 };
  59
  60 static int
  61 write_split_wim(WIMStruct *orig_wim, const tchar *swm_name,
  62                 struct swm_info *swm_info, int write_flags)
  63 {
  64         size_t swm_name_len;
  65         tchar *swm_name_buf;
  66         const tchar *dot;
  67         tchar *swm_suffix;
  68         size_t swm_base_name_len;
  69
  70         union wimlib_progress_info progress;
  71         unsigned part_number;
  72         int ret;
  73         u8 guid[GUID_SIZE];
  74
  75         swm_name_len = tstrlen(swm_name);
  76         swm_name_buf = alloca((swm_name_len + 20) * sizeof(tchar));
  77         tstrcpy(swm_name_buf, swm_name);
  78         dot = tstrrchr(path_basename(swm_name_buf), T('.'));
  79         if (dot) {
  80                 swm_base_name_len = dot - swm_name_buf;
  81                 swm_suffix = alloca((tstrlen(dot) + 1) * sizeof(tchar));
  82                 tstrcpy(swm_suffix, dot);
  83         } else {
  84                 swm_base_name_len = swm_name_len;
  85                 swm_suffix = alloca(1 * sizeof(tchar));
  86                 swm_suffix[0] = T('\0');
  87         }
  88
  89         progress.split.completed_bytes = 0;
  90         progress.split.total_bytes = 0;
  91         for (part_number = 1; part_number <= swm_info->num_parts; part_number++)
  92                 progress.split.total_bytes += swm_info->parts[part_number - 1].size;
  93         progress.split.total_parts = swm_info->num_parts;
  94
  95         generate_guid(guid);
  96
  97         for (part_number = 1; part_number <= swm_info->num_parts; part_number++) {
  98                 int part_write_flags;
  99
 100                 if (part_number != 1) {
 101                         tsprintf(swm_name_buf + swm_base_name_len,
 102                                  T("%u%"TS), part_number, swm_suffix);
 103                 }
 104
 105                 progress.split.cur_part_number = part_number;
 106                 progress.split.part_name = swm_name_buf;
 107
 108                 ret = call_progress(orig_wim->progfunc,
 109                                     WIMLIB_PROGRESS_MSG_SPLIT_BEGIN_PART,
 110                                     &progress,
 111                                     orig_wim->progctx);
 112                 if (ret)
 113                         return ret;
 114
 115                 part_write_flags = write_flags;
 116                 part_write_flags |= WIMLIB_WRITE_FLAG_USE_EXISTING_TOTALBYTES;
 117                 if (part_number != 1)
 118                         part_write_flags |= WIMLIB_WRITE_FLAG_NO_METADATA;
 119
 120                 ret = write_wim_part(orig_wim,
 121                                      progress.split.part_name,
 122                                      WIMLIB_ALL_IMAGES,
 123                                      part_write_flags,
 124                                      1,
 125                                      part_number,
 126                                      swm_info->num_parts,
 127                                      &swm_info->parts[part_number - 1].blob_list,
 128                                      guid);
 129                 if (ret)
 130                         return ret;
 131
 132                 progress.split.completed_bytes += swm_info->parts[part_number - 1].size;
 133
 134                 ret = call_progress(orig_wim->progfunc,
 135                                     WIMLIB_PROGRESS_MSG_SPLIT_END_PART,
 136                                     &progress,
 137                                     orig_wim->progctx);
 138                 if (ret)
 139                         return ret;
 140         }
 141         return 0;
 142 }
 143
 144 static int
 145 start_new_swm_part(struct swm_info *swm_info)
 146 {
 147         if (swm_info->num_parts == swm_info->num_alloc_parts) {
 148                 struct swm_part_info *parts;
 149                 size_t num_alloc_parts = swm_info->num_alloc_parts;
 150
 151                 num_alloc_parts += 8;
 152                 parts = MALLOC(num_alloc_parts * sizeof(parts[0]));
 153                 if (!parts)
 154                         return WIMLIB_ERR_NOMEM;
 155
 156                 for (unsigned i = 0; i < swm_info->num_parts; i++)
 157                         copy_part_info(&parts[i], &swm_info->parts[i]);
 158
 159                 FREE(swm_info->parts);
 160                 swm_info->parts = parts;
 161                 swm_info->num_alloc_parts = num_alloc_parts;
 162         }
 163         swm_info->num_parts++;
 164         INIT_LIST_HEAD(&swm_info->parts[swm_info->num_parts - 1].blob_list);
 165         swm_info->parts[swm_info->num_parts - 1].size = 0;
 166         return 0;
 167 }
 168
 169 static int
 170 add_blob_to_swm(struct blob_descriptor *blob, void *_swm_info)
 171 {
 172         struct swm_info *swm_info = _swm_info;
 173         u64 blob_stored_size;
 174         int ret;
 175
 176         if (blob->blob_location == BLOB_IN_WIM)
 177                 blob_stored_size = blob->rdesc->size_in_wim;
 178         else
 179                 blob_stored_size = blob->size;
 180
 181         /* Start the next part if adding this blob exceeds the maximum part
 182          * size, UNLESS the blob is metadata or if no blobs at all have been
 183          * added to the current part.  */
 184         if ((swm_info->parts[swm_info->num_parts - 1].size +
 185              blob_stored_size >= swm_info->max_part_size)
 186             && !(blob->is_metadata ||
 187                  swm_info->parts[swm_info->num_parts - 1].size == 0))
 188         {
 189                 ret = start_new_swm_part(swm_info);
 190                 if (ret)
 191                         return ret;
 192         }
 193         swm_info->parts[swm_info->num_parts - 1].size += blob_stored_size;
 194         if (!blob->is_metadata) {
 195                 list_add_tail(&blob->write_blobs_list,
 196                               &swm_info->parts[swm_info->num_parts - 1].blob_list);
 197         }
 198         swm_info->total_bytes += blob_stored_size;
 199         return 0;
 200 }
 201
 202 /* API function documented in wimlib.h  */
 203 WIMLIBAPI int
 204 wimlib_split(WIMStruct *wim, const tchar *swm_name,
 205              u64 part_size, int write_flags)
 206 {
 207         struct swm_info swm_info;
 208         unsigned i;
 209         int ret;
 210
 211         if (swm_name == NULL || swm_name[0] == T('\0') || part_size == 0)
 212                 return WIMLIB_ERR_INVALID_PARAM;
 213
 214         if (write_flags & ~WIMLIB_WRITE_MASK_PUBLIC)
 215                 return WIMLIB_ERR_INVALID_PARAM;
 216
 217         if (!wim_has_metadata(wim))
 218                 return WIMLIB_ERR_METADATA_NOT_FOUND;
 219
 220         if (wim_has_solid_resources(wim)) {
 221                 ERROR("Splitting of WIM containing solid resources is not supported.\n"
 222                       "        Export it in non-solid format first.");
 223                 return WIMLIB_ERR_UNSUPPORTED;
 224         }
 225
 226         for (i = 0; i < wim->hdr.image_count; i++) {
 227                 if (!is_image_unchanged_from_wim(wim->image_metadata[i], wim)) {
 228                         ERROR("Only an unmodified, on-disk WIM file can be split.");
 229                         return WIMLIB_ERR_UNSUPPORTED;
 230                 }
 231         }
 232
 233         memset(&swm_info, 0, sizeof(swm_info));
 234         swm_info.max_part_size = part_size;
 235
 236         ret = start_new_swm_part(&swm_info);
 237         if (ret)
 238                 goto out_free_swm_info;
 239
 240         for (i = 0; i < wim->hdr.image_count; i++) {
 241                 ret = add_blob_to_swm(wim->image_metadata[i]->metadata_blob,
 242                                       &swm_info);
 243                 if (ret)
 244                         goto out_free_swm_info;
 245         }
 246
 247         ret = for_blob_in_table_sorted_by_sequential_order(wim->blob_table,
 248                                                            add_blob_to_swm,
 249                                                            &swm_info);
 250         if (ret)
 251                 goto out_free_swm_info;
 252
 253         ret = write_split_wim(wim, swm_name, &swm_info, write_flags);
 254 out_free_swm_info:
 255         FREE(swm_info.parts);
 256         return ret;
 257 }