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