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 lookup_table_entry *lte_chain_head;
  37         struct lookup_table_entry *lte_chain_tail;
  38         int    part_number;
  39         int    write_flags;
  40         long   size_remaining;
  41         size_t part_size;
  42         u64    total_bytes;
  43         u64    total_bytes_written;
  44 };
  45
  46 static int finish_swm(WIMStruct *w, struct lookup_table_entry *lte_chain_head,
  47                       int write_flags)
  48 {
  49         off_t lookup_table_offset = ftello(w->out_fp);
  50         int ret;
  51
  52         DEBUG("Writing lookup table for SWM (offset %"PRIu64")",
  53                         lookup_table_offset);
  54
  55         while (lte_chain_head != NULL) {
  56                 ret = write_lookup_table_entry(lte_chain_head, w->out_fp);
  57                 if (ret != 0)
  58                         return ret;
  59                 struct lookup_table_entry *prev = lte_chain_head;
  60                 lte_chain_head = lte_chain_head->next_lte_in_swm;
  61                 prev->next_lte_in_swm = NULL;
  62         }
  63         off_t xml_data_offset = ftello(w->out_fp);
  64
  65         if (lookup_table_offset == -1 || xml_data_offset == -1)
  66                 return WIMLIB_ERR_WRITE;
  67         w->hdr.lookup_table_res_entry.offset = lookup_table_offset;
  68         w->hdr.lookup_table_res_entry.size =
  69                                 xml_data_offset - lookup_table_offset;
  70         return finish_write(w, WIM_ALL_IMAGES,
  71                             write_flags | WIMLIB_WRITE_FLAG_NO_LOOKUP_TABLE);
  72 }
  73
  74 static int copy_resource_to_swm(struct lookup_table_entry *lte, void *__args)
  75 {
  76         struct split_args *args = (struct split_args*)__args;
  77         WIMStruct *w = args->w;
  78         int ret;
  79
  80         /* metadata resources were already written. */
  81         if (lte->resource_entry.flags & WIM_RESHDR_FLAG_METADATA)
  82                 return 0;
  83
  84         if (args->size_remaining < 0 ||
  85                         (u64)args->size_remaining < lte->resource_entry.size) {
  86
  87                 /* No space for this resource.  Finish the previous swm and
  88                  * start a new one. */
  89
  90                 ret = finish_swm(w, args->lte_chain_head, args->write_flags);
  91
  92                 args->lte_chain_tail = NULL;
  93                 args->lte_chain_head = NULL;
  94
  95                 sprintf(args->swm_base_name + args->swm_base_name_len, "%d%s",
  96                         ++args->part_number, args->swm_suffix);
  97
  98                 w->hdr.part_number = args->part_number;
  99
 100                 if (args->write_flags & WIMLIB_OPEN_FLAG_SHOW_PROGRESS)
 101                         printf("Writing `%s' (%"PRIu64" of %"PRIu64" bytes, "
 102                                "%.0f%% done)\n",
 103                                args->swm_base_name,
 104                                args->total_bytes_written,
 105                                args->total_bytes,
 106                                (double)args->total_bytes_written /
 107                                    (double)args->total_bytes * 100.0);
 108
 109                 ret = begin_write(w, args->swm_base_name, args->write_flags);
 110                 if (ret != 0)
 111                         return ret;
 112                 args->size_remaining = args->part_size;
 113         }
 114         args->size_remaining -= lte->resource_entry.size;
 115         args->total_bytes_written += lte->resource_entry.size;
 116         if (args->lte_chain_tail)
 117                 args->lte_chain_tail->next_lte_in_swm = lte;
 118         else
 119                 args->lte_chain_head = lte;
 120         args->lte_chain_tail = lte;
 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(const char *wimfile, const char *swm_name,
 127                            size_t part_size, int flags)
 128 {
 129         int ret;
 130         WIMStruct *w;
 131         int write_flags = 0;
 132         size_t swm_name_len = strlen(swm_name);
 133         size_t swm_base_name_len;
 134         char name[swm_name_len + 20];
 135         char *swm_suffix;
 136
 137         struct lookup_table_entry *lte_chain_head = NULL;
 138         struct lookup_table_entry *lte_chain_tail = NULL;
 139         long size_remaining = part_size;
 140         u64 total_bytes_written = 0;
 141         u64 total_bytes;
 142
 143         ret = wimlib_open_wim(wimfile, flags, &w);
 144         if (ret != 0)
 145                 return ret;
 146
 147         total_bytes = wim_info_get_total_bytes(w->wim_info);
 148
 149         if (flags & WIMLIB_OPEN_FLAG_CHECK_INTEGRITY)
 150                 write_flags |= WIMLIB_WRITE_FLAG_CHECK_INTEGRITY;
 151         if (flags & WIMLIB_OPEN_FLAG_SHOW_PROGRESS)
 152                 write_flags |= WIMLIB_WRITE_FLAG_SHOW_PROGRESS;
 153
 154         w->hdr.flags |= WIM_HDR_FLAG_SPANNED;
 155         w->hdr.boot_idx = 0;
 156         randomize_byte_array(w->hdr.guid, WIM_GID_LEN);
 157         ret = begin_write(w, swm_name, write_flags);
 158         if (ret != 0)
 159                 return ret;
 160
 161         swm_suffix = strchr(swm_name, '.');
 162         memcpy(name, swm_name, swm_name_len + 1);
 163         if (swm_suffix) {
 164                 swm_base_name_len = swm_suffix - swm_name;
 165         } else {
 166                 swm_base_name_len = swm_name_len;
 167                 name[sizeof(name) - 1] = '\0';
 168                 swm_suffix = &name[sizeof(name) - 1];
 169         }
 170
 171         if (write_flags & WIMLIB_OPEN_FLAG_SHOW_PROGRESS)
 172                 printf("Writing `%s' (%.2f %% done)\n",
 173                         swm_name,
 174                         (double)total_bytes_written /
 175                                 (double)total_bytes * 100.0);
 176
 177         w->write_metadata = true;
 178         for (int i = 0; i < w->hdr.image_count; i++) {
 179                 struct lookup_table_entry *metadata_lte;
 180
 181                 DEBUG("Writing metadata resource %d", i);
 182
 183                 metadata_lte = w->image_metadata[i].metadata_lte;
 184                 ret = copy_resource(metadata_lte, w);
 185                 if (ret != 0)
 186                         return ret;
 187                 size_remaining -= metadata_lte->resource_entry.size;
 188                 total_bytes_written += metadata_lte->resource_entry.size;
 189                 if (lte_chain_tail)
 190                         lte_chain_tail->next_lte_in_swm = metadata_lte;
 191                 else
 192                         lte_chain_head = metadata_lte;
 193                 lte_chain_tail = metadata_lte;
 194         }
 195         w->write_metadata = false;
 196
 197         struct split_args args = {
 198                 .w                 = w,
 199                 .swm_base_name     = name,
 200                 .swm_base_name_len = swm_base_name_len,
 201                 .swm_suffix        = swm_suffix,
 202                 .lte_chain_head    = lte_chain_head,
 203                 .lte_chain_tail    = lte_chain_tail,
 204                 .part_number       = 1,
 205                 .write_flags       = write_flags,
 206                 .size_remaining    = size_remaining,
 207                 .part_size         = part_size,
 208                 .total_bytes        = total_bytes,
 209                 .total_bytes_written = total_bytes_written,
 210         };
 211
 212         ret = for_lookup_table_entry(w->lookup_table, copy_resource_to_swm, &args);
 213         if (ret != 0)
 214                 return ret;
 215
 216         ret = finish_swm(w, args.lte_chain_head, write_flags);
 217         if (ret != 0)
 218                 return ret;
 219
 220
 221         /* The swms are all ready now, except the total_parts and part_number
 222          * fields in their headers are wrong (we don't know the total parts
 223          * until they are all written).  Fix them. */
 224         int total_parts = args.part_number;
 225         for (int i = 1; i <= total_parts; i++) {
 226                 const char *p;
 227                 if (i == 1) {
 228                         p = swm_name;
 229                 } else {
 230                         sprintf(name + swm_base_name_len, "%d", i);
 231                         p = strcat(name, swm_suffix);
 232                 }
 233
 234                 FILE *fp = fopen(p, "r+b");
 235                 if (!fp) {
 236                         ERROR_WITH_ERRNO("Failed to open `%s'", p);
 237                         return WIMLIB_ERR_OPEN;
 238                 }
 239                 u8 buf[4];
 240                 put_u16(&buf[0], i);
 241                 put_u16(&buf[2], total_parts);
 242
 243                 if (fseek(fp, 40, SEEK_SET) != 0 ||
 244                                 fwrite(buf, 1, sizeof(buf), fp) != sizeof(buf)
 245                                 || fclose(fp) != 0) {
 246                         ERROR_WITH_ERRNO("Error overwriting header of `%s'",
 247                                          name);
 248                         return WIMLIB_ERR_WRITE;
 249                 }
 250         }
 251         if (write_flags & WIMLIB_OPEN_FLAG_SHOW_PROGRESS)
 252                 puts("Done!");
 253         wimlib_free(w);
 254         return 0;
 255 }