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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/error.h"
  32 #include "wimlib/list.h"
  33 #include "wimlib/lookup_table.h"
  34 #include "wimlib/metadata.h"
  35 #include "wimlib/progress.h"
  36 #include "wimlib/resource.h"
  37 #include "wimlib/wim.h"
  38 #include "wimlib/write.h"
  39
  40 #ifdef HAVE_ALLOCA_H
  41 #  include <alloca.h>
  42 #else
  43 #  include <stdlib.h>
  44 #endif
  45
  46 struct swm_part_info {
  47         struct list_head stream_list;
  48         u64 size;
  49 };
  50
  51 static void
  52 copy_part_info(struct swm_part_info *dst, struct swm_part_info *src)
  53 {
  54         list_transfer(&src->stream_list, &dst->stream_list);
  55         dst->size = src->size;
  56 }
  57
  58 struct swm_info {
  59         struct swm_part_info *parts;
  60         unsigned num_parts;
  61         unsigned num_alloc_parts;
  62         u64 total_bytes;
  63         u64 max_part_size;
  64 };
  65
  66 static int
  67 write_split_wim(WIMStruct *orig_wim, const tchar *swm_name,
  68                 struct swm_info *swm_info, int write_flags)
  69 {
  70         size_t swm_name_len;
  71         tchar *swm_name_buf;
  72         const tchar *dot;
  73         tchar *swm_suffix;
  74         size_t swm_base_name_len;
  75
  76         union wimlib_progress_info progress;
  77         unsigned part_number;
  78         int ret;
  79         u8 guid[WIMLIB_GUID_LEN];
  80
  81         swm_name_len = tstrlen(swm_name);
  82         swm_name_buf = alloca((swm_name_len + 20) * sizeof(tchar));
  83         tstrcpy(swm_name_buf, swm_name);
  84         dot = tstrchr(swm_name_buf, T('.'));
  85         if (dot) {
  86                 swm_base_name_len = dot - swm_name_buf;
  87                 swm_suffix = alloca((tstrlen(dot) + 1) * sizeof(tchar));
  88                 tstrcpy(swm_suffix, dot);
  89         } else {
  90                 swm_base_name_len = swm_name_len;
  91                 swm_suffix = alloca(1 * sizeof(tchar));
  92                 swm_suffix[0] = T('\0');
  93         }
  94
  95         progress.split.completed_bytes = 0;
  96         progress.split.total_bytes = 0;
  97         for (part_number = 1; part_number <= swm_info->num_parts; part_number++)
  98                 progress.split.total_bytes += swm_info->parts[part_number - 1].size;
  99         progress.split.total_parts = swm_info->num_parts;
 100
 101         randomize_byte_array(guid, WIMLIB_GUID_LEN);
 102
 103         for (part_number = 1; part_number <= swm_info->num_parts; part_number++) {
 104                 int part_write_flags;
 105                 wimlib_progress_func_t progfunc;
 106
 107                 if (part_number != 1) {
 108                         tsprintf(swm_name_buf + swm_base_name_len,
 109                                  T("%u%"TS), part_number, swm_suffix);
 110                 }
 111
 112                 progress.split.cur_part_number = part_number;
 113                 progress.split.part_name = swm_name_buf;
 114
 115                 ret = call_progress(orig_wim->progfunc,
 116                                     WIMLIB_PROGRESS_MSG_SPLIT_BEGIN_PART,
 117                                     &progress,
 118                                     orig_wim->progctx);
 119                 if (ret)
 120                         return ret;
 121
 122                 part_write_flags = write_flags;
 123                 part_write_flags |= WIMLIB_WRITE_FLAG_USE_EXISTING_TOTALBYTES;
 124                 if (part_number != 1)
 125                         part_write_flags |= WIMLIB_WRITE_FLAG_NO_METADATA;
 126
 127                 progfunc = orig_wim->progfunc;
 128                 orig_wim->progfunc = NULL;
 129                 ret = write_wim_part(orig_wim,
 130                                      progress.split.part_name,
 131                                      WIMLIB_ALL_IMAGES,
 132                                      part_write_flags,
 133                                      1,
 134                                      part_number,
 135                                      swm_info->num_parts,
 136                                      &swm_info->parts[part_number - 1].stream_list,
 137                                      guid);
 138                 orig_wim->progfunc = progfunc;
 139                 if (ret)
 140                         return ret;
 141
 142                 progress.split.completed_bytes += swm_info->parts[part_number - 1].size;
 143
 144                 ret = call_progress(orig_wim->progfunc,
 145                                     WIMLIB_PROGRESS_MSG_SPLIT_END_PART,
 146                                     &progress,
 147                                     orig_wim->progctx);
 148                 if (ret)
 149                         return ret;
 150         }
 151         return 0;
 152 }
 153
 154 static int
 155 add_stream_to_swm(struct wim_lookup_table_entry *lte, void *_swm_info)
 156 {
 157         struct swm_info *swm_info = _swm_info;
 158         u64 stream_size;
 159
 160         if (lte_is_partial(lte)) {
 161                 ERROR("Splitting of WIM containing packed streams is not supported.\n"
 162                       "        Export it in the default format first.");
 163                 return WIMLIB_ERR_UNSUPPORTED;
 164         }
 165         if (lte->resource_location == RESOURCE_IN_WIM)
 166                 stream_size = lte->rspec->size_in_wim;
 167         else
 168                 stream_size = lte->size;
 169
 170         /* - Start first part if no parts have been started so far;
 171          * - Start next part if adding this stream exceeds maximum part size,
 172          *   UNLESS the stream is metadata or if no streams at all have been
 173          *   added to the current part.
 174          */
 175         if (swm_info->num_parts == 0 ||
 176             ((swm_info->parts[swm_info->num_parts - 1].size +
 177                         stream_size >= swm_info->max_part_size)
 178              && !((lte->flags & WIM_RESHDR_FLAG_METADATA) ||
 179                    swm_info->parts[swm_info->num_parts - 1].size == 0)))
 180         {
 181                 if (swm_info->num_parts == swm_info->num_alloc_parts) {
 182                         struct swm_part_info *parts;
 183                         size_t num_alloc_parts = swm_info->num_alloc_parts;
 184
 185                         num_alloc_parts += 8;
 186                         parts = MALLOC(num_alloc_parts * sizeof(parts[0]));
 187                         if (!parts)
 188                                 return WIMLIB_ERR_NOMEM;
 189
 190                         for (unsigned i = 0; i < swm_info->num_parts; i++)
 191                                 copy_part_info(&parts[i], &swm_info->parts[i]);
 192
 193                         FREE(swm_info->parts);
 194                         swm_info->parts = parts;
 195                         swm_info->num_alloc_parts = num_alloc_parts;
 196                 }
 197                 swm_info->num_parts++;
 198                 INIT_LIST_HEAD(&swm_info->parts[swm_info->num_parts - 1].stream_list);
 199                 swm_info->parts[swm_info->num_parts - 1].size = 0;
 200         }
 201         swm_info->parts[swm_info->num_parts - 1].size += stream_size;
 202         if (!(lte->flags & WIM_RESHDR_FLAG_METADATA)) {
 203                 list_add_tail(&lte->write_streams_list,
 204                               &swm_info->parts[swm_info->num_parts - 1].stream_list);
 205         }
 206         swm_info->total_bytes += stream_size;
 207         return 0;
 208 }
 209
 210 /* API function documented in wimlib.h  */
 211 WIMLIBAPI int
 212 wimlib_split(WIMStruct *wim, const tchar *swm_name,
 213              u64 part_size, int write_flags)
 214 {
 215         struct swm_info swm_info;
 216         unsigned i;
 217         int ret;
 218
 219         if (swm_name == NULL || swm_name[0] == T('\0') || part_size == 0)
 220                 return WIMLIB_ERR_INVALID_PARAM;
 221
 222         if (write_flags & ~WIMLIB_WRITE_MASK_PUBLIC)
 223                 return WIMLIB_ERR_INVALID_PARAM;
 224
 225         if (!wim_has_metadata(wim))
 226                 return WIMLIB_ERR_METADATA_NOT_FOUND;
 227
 228         memset(&swm_info, 0, sizeof(swm_info));
 229         swm_info.max_part_size = part_size;
 230
 231         for (i = 0; i < wim->hdr.image_count; i++) {
 232                 ret = add_stream_to_swm(wim->image_metadata[i]->metadata_lte,
 233                                         &swm_info);
 234                 if (ret)
 235                         goto out_free_swm_info;
 236         }
 237
 238         ret = for_lookup_table_entry_pos_sorted(wim->lookup_table,
 239                                                 add_stream_to_swm,
 240                                                 &swm_info);
 241         if (ret)
 242                 goto out_free_swm_info;
 243
 244         ret = write_split_wim(wim, swm_name, &swm_info, write_flags);
 245 out_free_swm_info:
 246         FREE(swm_info.parts);
 247         return ret;
 248 }