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