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 "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    part_number;
  38         int    write_flags;
  39         long   size_remaining;
  40         size_t part_size;
  41         u64    total_bytes;
  42         u64    total_bytes_written;
  43 };
  44
  45 static int finish_swm(WIMStruct *w, struct list_head *lte_list,
  46                       int write_flags)
  47 {
  48         off_t lookup_table_offset = ftello(w->out_fp);
  49         int ret;
  50         struct lookup_table_entry *lte;
  51
  52         DEBUG("Writing lookup table for SWM (offset %"PRIu64")",
  53                         lookup_table_offset);
  54
  55         list_for_each_entry(lte, lte_list, staging_list) {
  56                 ret = write_lookup_table_entry(lte, w->out_fp);
  57                 if (ret != 0)
  58                         return ret;
  59         }
  60
  61         off_t xml_data_offset = ftello(w->out_fp);
  62
  63         if (lookup_table_offset == -1 || xml_data_offset == -1)
  64                 return WIMLIB_ERR_WRITE;
  65         w->hdr.lookup_table_res_entry.offset = lookup_table_offset;
  66         w->hdr.lookup_table_res_entry.size =
  67                                 xml_data_offset - lookup_table_offset;
  68         w->hdr.lookup_table_res_entry.original_size =
  69                                 xml_data_offset - lookup_table_offset;
  70         w->hdr.lookup_table_res_entry.flags = WIM_RESHDR_FLAG_METADATA;
  71         return finish_write(w, WIM_ALL_IMAGES,
  72                             write_flags | WIMLIB_WRITE_FLAG_NO_LOOKUP_TABLE);
  73 }
  74
  75 static int copy_resource_to_swm(struct lookup_table_entry *lte, void *__args)
  76 {
  77         struct split_args *args = (struct split_args*)__args;
  78         WIMStruct *w = args->w;
  79         int ret;
  80
  81         /* metadata resources were already written. */
  82         if (lte->resource_entry.flags & WIM_RESHDR_FLAG_METADATA)
  83                 return 0;
  84
  85         if (args->size_remaining < 0 ||
  86                         (u64)args->size_remaining < lte->resource_entry.size) {
  87
  88                 /* No space for this resource.  Finish the previous swm and
  89                  * start a new one. */
  90
  91                 ret = finish_swm(w, args->lte_list, args->write_flags);
  92                 if (ret != 0)
  93                         return ret;
  94                 INIT_LIST_HEAD(args->lte_list);
  95
  96                 sprintf(args->swm_base_name + args->swm_base_name_len, "%d%s",
  97                         ++args->part_number, args->swm_suffix);
  98
  99                 w->hdr.part_number = args->part_number;
 100
 101                 if (args->write_flags & WIMLIB_OPEN_FLAG_SHOW_PROGRESS)
 102                         printf("Writing `%s' (%"PRIu64" of %"PRIu64" bytes, "
 103                                "%.0f%% done)\n",
 104                                args->swm_base_name,
 105                                args->total_bytes_written,
 106                                args->total_bytes,
 107                                (double)args->total_bytes_written /
 108                                    (double)args->total_bytes * 100.0);
 109
 110                 ret = begin_write(w, args->swm_base_name, args->write_flags);
 111                 if (ret != 0)
 112                         return ret;
 113                 args->size_remaining = args->part_size;
 114         }
 115         args->size_remaining -= lte->resource_entry.size;
 116         args->total_bytes_written += lte->resource_entry.size;
 117         list_add(&lte->staging_list, args->lte_list);
 118         return copy_resource(lte, w);
 119 }
 120
 121 /* Splits the WIM file @wimfile into multiple parts prefixed by @swm_name with
 122  * size at most @part_size. */
 123 WIMLIBAPI int wimlib_split(const char *wimfile, const char *swm_name,
 124                            size_t part_size, int flags)
 125 {
 126         int ret;
 127         WIMStruct *w;
 128         int write_flags = 0;
 129         size_t swm_name_len = strlen(swm_name);
 130         size_t swm_base_name_len;
 131         char name[swm_name_len + 20];
 132         char *swm_suffix;
 133
 134         long size_remaining = part_size;
 135         u64 total_bytes_written = 0;
 136         u64 total_bytes;
 137
 138         ret = wimlib_open_wim(wimfile, flags, &w);
 139         if (ret != 0)
 140                 return ret;
 141
 142         total_bytes = wim_info_get_total_bytes(w->wim_info);
 143
 144         if (flags & WIMLIB_OPEN_FLAG_CHECK_INTEGRITY)
 145                 write_flags |= WIMLIB_WRITE_FLAG_CHECK_INTEGRITY;
 146         if (flags & WIMLIB_OPEN_FLAG_SHOW_PROGRESS)
 147                 write_flags |= WIMLIB_WRITE_FLAG_SHOW_PROGRESS;
 148
 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                 return ret;
 155
 156         swm_suffix = strchr(swm_name, '.');
 157         memcpy(name, swm_name, swm_name_len + 1);
 158         if (swm_suffix) {
 159                 swm_base_name_len = swm_suffix - swm_name;
 160         } else {
 161                 swm_base_name_len = swm_name_len;
 162                 name[sizeof(name) - 1] = '\0';
 163                 swm_suffix = &name[sizeof(name) - 1];
 164         }
 165
 166         if (write_flags & WIMLIB_OPEN_FLAG_SHOW_PROGRESS)
 167                 printf("Writing `%s' (%.2f %% done)\n",
 168                         swm_name,
 169                         (double)total_bytes_written /
 170                                 (double)total_bytes * 100.0);
 171
 172         w->write_metadata = true;
 173         LIST_HEAD(lte_list);
 174         for (int i = 0; i < w->hdr.image_count; i++) {
 175                 struct lookup_table_entry *metadata_lte;
 176
 177                 DEBUG("Writing metadata resource %d", i);
 178
 179                 metadata_lte = w->image_metadata[i].metadata_lte;
 180                 ret = copy_resource(metadata_lte, w);
 181                 if (ret != 0)
 182                         return ret;
 183                 size_remaining -= metadata_lte->resource_entry.size;
 184                 total_bytes_written += metadata_lte->resource_entry.size;
 185                 list_add(&metadata_lte->staging_list, &lte_list);
 186         }
 187         w->write_metadata = false;
 188
 189         struct split_args args = {
 190                 .w                 = w,
 191                 .swm_base_name     = name,
 192                 .swm_base_name_len = swm_base_name_len,
 193                 .swm_suffix        = swm_suffix,
 194                 .lte_list          = &lte_list,
 195                 .part_number       = 1,
 196                 .write_flags       = write_flags,
 197                 .size_remaining    = size_remaining,
 198                 .part_size         = part_size,
 199                 .total_bytes        = total_bytes,
 200                 .total_bytes_written = total_bytes_written,
 201         };
 202
 203         ret = for_lookup_table_entry(w->lookup_table, copy_resource_to_swm, &args);
 204         if (ret != 0)
 205                 return ret;
 206
 207         ret = finish_swm(w, &lte_list, write_flags);
 208         if (ret != 0)
 209                 return ret;
 210
 211
 212         /* The swms are all ready now, except the total_parts and part_number
 213          * fields in their headers are wrong (we don't know the total parts
 214          * until they are all written).  Fix them. */
 215         int total_parts = args.part_number;
 216         for (int i = 1; i <= total_parts; i++) {
 217                 const char *p;
 218                 if (i == 1) {
 219                         p = swm_name;
 220                 } else {
 221                         sprintf(name + swm_base_name_len, "%d", i);
 222                         p = strcat(name, swm_suffix);
 223                 }
 224
 225                 FILE *fp = fopen(p, "r+b");
 226                 if (!fp) {
 227                         ERROR_WITH_ERRNO("Failed to open `%s'", p);
 228                         return WIMLIB_ERR_OPEN;
 229                 }
 230                 u8 buf[4];
 231                 put_u16(&buf[0], i);
 232                 put_u16(&buf[2], total_parts);
 233
 234                 if (fseek(fp, 40, SEEK_SET) != 0 ||
 235                                 fwrite(buf, 1, sizeof(buf), fp) != sizeof(buf)
 236                                 || fclose(fp) != 0) {
 237                         ERROR_WITH_ERRNO("Error overwriting header of `%s'",
 238                                          name);
 239                         return WIMLIB_ERR_WRITE;
 240                 }
 241         }
 242         if (write_flags & WIMLIB_OPEN_FLAG_SHOW_PROGRESS)
 243                 puts("Done!");
 244         wimlib_free(w);
 245         return 0;
 246 }