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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/resource.h"
  36 #include "wimlib/wim.h"
  37 #include "wimlib/write.h"
  38
  39 #ifdef HAVE_ALLOCA_H
  40 #  include <alloca.h>
  41 #else
  42 #  include <stdlib.h>
  43 #endif
  44
  45 struct swm_part_info {
  46         struct list_head stream_list;
  47         u64 size;
  48 };
  49
  50 static void
  51 copy_part_info(struct swm_part_info *dst, struct swm_part_info *src)
  52 {
  53         list_transfer(&src->stream_list, &dst->stream_list);
  54         dst->size = src->size;
  55 }
  56
  57 struct swm_info {
  58         struct swm_part_info *parts;
  59         unsigned num_parts;
  60         unsigned num_alloc_parts;
  61         u64 total_bytes;
  62         u64 max_part_size;
  63 };
  64
  65 static int
  66 write_split_wim(WIMStruct *orig_wim, const tchar *swm_name,
  67                 struct swm_info *swm_info, int write_flags,
  68                 wimlib_progress_func_t progress_func)
  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         progress.split.part_name = swm_name_buf;
 101
 102         randomize_byte_array(guid, WIMLIB_GUID_LEN);
 103
 104         for (part_number = 1; part_number <= swm_info->num_parts; part_number++) {
 105                 int part_write_flags;
 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                 if (progress_func) {
 114                         progress_func(WIMLIB_PROGRESS_MSG_SPLIT_BEGIN_PART,
 115                                       &progress);
 116                 }
 117
 118                 part_write_flags = write_flags & WIMLIB_WRITE_MASK_PUBLIC;
 119                 part_write_flags |= WIMLIB_WRITE_FLAG_USE_EXISTING_TOTALBYTES;
 120                 if (part_number != 1)
 121                         part_write_flags |= WIMLIB_WRITE_FLAG_NO_METADATA;
 122
 123                 ret = write_wim_part(orig_wim,
 124                                      swm_name_buf,
 125                                      WIMLIB_ALL_IMAGES,
 126                                      part_write_flags,
 127                                      1,
 128                                      NULL,
 129                                      part_number,
 130                                      swm_info->num_parts,
 131                                      &swm_info->parts[part_number - 1].stream_list,
 132                                      guid);
 133                 if (ret)
 134                         return ret;
 135
 136                 progress.split.completed_bytes += swm_info->parts[part_number - 1].size;
 137                 if (progress_func) {
 138                         progress_func(WIMLIB_PROGRESS_MSG_SPLIT_END_PART,
 139                                       &progress);
 140                 }
 141         }
 142         return 0;
 143 }
 144
 145 static int
 146 add_stream_to_swm(struct wim_lookup_table_entry *lte, void *_swm_info)
 147 {
 148         struct swm_info *swm_info = _swm_info;
 149         u64 stream_size;
 150
 151         stream_size = lte->resource_entry.size;
 152
 153         /* - Start first part if no parts have been started so far;
 154          * - Start next part if adding this stream exceeds maximum part size,
 155          *   UNLESS the stream is metadata or if no streams at all have been
 156          *   added to the current part.
 157          */
 158         if (swm_info->num_parts == 0 ||
 159             ((swm_info->parts[swm_info->num_parts - 1].size +
 160                         stream_size >= swm_info->max_part_size)
 161              && !((lte->resource_entry.flags & WIM_RESHDR_FLAG_METADATA) ||
 162                    swm_info->parts[swm_info->num_parts - 1].size == 0)))
 163         {
 164                 if (swm_info->num_parts == swm_info->num_alloc_parts) {
 165                         struct swm_part_info *parts;
 166                         size_t num_alloc_parts = swm_info->num_alloc_parts;
 167
 168                         num_alloc_parts += 8;
 169                         parts = MALLOC(num_alloc_parts * sizeof(parts[0]));
 170                         if (!parts)
 171                                 return WIMLIB_ERR_NOMEM;
 172
 173                         for (unsigned i = 0; i < swm_info->num_parts; i++)
 174                                 copy_part_info(&parts[i], &swm_info->parts[i]);
 175
 176                         FREE(swm_info->parts);
 177                         swm_info->parts = parts;
 178                         swm_info->num_alloc_parts = num_alloc_parts;
 179                 }
 180                 swm_info->num_parts++;
 181                 INIT_LIST_HEAD(&swm_info->parts[swm_info->num_parts - 1].stream_list);
 182                 swm_info->parts[swm_info->num_parts - 1].size = 0;
 183         }
 184         swm_info->parts[swm_info->num_parts - 1].size += stream_size;
 185         if (!(lte->resource_entry.flags & WIM_RESHDR_FLAG_METADATA)) {
 186                 list_add_tail(&lte->write_streams_list,
 187                               &swm_info->parts[swm_info->num_parts - 1].stream_list);
 188         }
 189         swm_info->total_bytes += stream_size;
 190         return 0;
 191 }
 192
 193 /* API function documented in wimlib.h  */
 194 WIMLIBAPI int
 195 wimlib_split(WIMStruct *wim, const tchar *swm_name,
 196              u64 part_size, int write_flags,
 197              wimlib_progress_func_t progress_func)
 198 {
 199         struct swm_info swm_info;
 200         unsigned i;
 201         int ret;
 202
 203         if (swm_name == NULL || swm_name[0] == T('\0') || part_size == 0)
 204                 return WIMLIB_ERR_INVALID_PARAM;
 205
 206         if (!wim_has_metadata(wim))
 207                 return WIMLIB_ERR_INVALID_PARAM;
 208
 209         memset(&swm_info, 0, sizeof(swm_info));
 210         swm_info.max_part_size = part_size;
 211
 212         for (i = 0; i < wim->hdr.image_count; i++) {
 213                 ret = add_stream_to_swm(wim->image_metadata[i]->metadata_lte,
 214                                         &swm_info);
 215                 if (ret)
 216                         goto out_free_swm_info;
 217         }
 218
 219         ret = for_lookup_table_entry_pos_sorted(wim->lookup_table,
 220                                                 add_stream_to_swm,
 221                                                 &swm_info);
 222         if (ret)
 223                 goto out_free_swm_info;
 224
 225         ret = write_split_wim(wim, swm_name, &swm_info, write_flags,
 226                               progress_func);
 227 out_free_swm_info:
 228         FREE(swm_info.parts);
 229         return ret;
 230 }