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   1 /*
   2  * join.c
   3  *
   4  * Join split WIMs (sometimes named as .swm files) together into one WIM.
   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/types.h"
  33 #include "wimlib/util.h"
  34 #include "wimlib/wim.h"
  35
  36 /*
  37  * verify_swm_set: - Sanity checks to make sure a set of WIMs correctly
  38  *                   correspond to a spanned set.
  39  *
  40  * @wim:
  41  *      Part 1 of the set.
  42  *
  43  * @additional_swms:
  44  *      All parts of the set other than part 1.
  45  *
  46  * @num_additional_swms:
  47  *      Number of WIMStructs in @additional_swms.  Or, the total number of parts
  48  *      in the set minus 1.
  49  *
  50  * @return:
  51  *      0 on success; WIMLIB_ERR_SPLIT_INVALID if the set is not valid.
  52  */
  53 static int
  54 verify_swm_set(WIMStruct *wim, WIMStruct **additional_swms,
  55                unsigned num_additional_swms)
  56 {
  57         unsigned total_parts = wim->hdr.total_parts;
  58         int ctype;
  59         u32 chunk_size;
  60         const u8 *guid;
  61
  62         if (total_parts != num_additional_swms + 1) {
  63                 ERROR("`%"TS"' says there are %u parts in the spanned set, "
  64                       "but %"TS"%u part%"TS" provided",
  65                       wim->filename, total_parts,
  66                       (num_additional_swms + 1 < total_parts) ? T("only ") : T(""),
  67                       num_additional_swms + 1,
  68                       (num_additional_swms) ? T("s were") : T(" was"));
  69                 return WIMLIB_ERR_SPLIT_INVALID;
  70         }
  71         if (wim->hdr.part_number != 1) {
  72                 ERROR("WIM `%"TS"' is not the first part of the split WIM.",
  73                       wim->filename);
  74                 return WIMLIB_ERR_SPLIT_INVALID;
  75         }
  76         for (unsigned i = 0; i < num_additional_swms; i++) {
  77                 if (additional_swms[i]->hdr.total_parts != total_parts) {
  78                         ERROR("WIM `%"TS"' says there are %u parts in the "
  79                               "spanned set, but %u parts were provided",
  80                               additional_swms[i]->filename,
  81                               additional_swms[i]->hdr.total_parts,
  82                               total_parts);
  83                         return WIMLIB_ERR_SPLIT_INVALID;
  84                 }
  85         }
  86
  87         /* Keep track of the compression type, chunk size, and GUID to make sure
  88          * they are the same for all the WIMs.  */
  89         ctype = wim->compression_type;
  90         chunk_size = wim->chunk_size;
  91         guid = wim->hdr.guid;
  92
  93         {
  94                 /* parts_to_swms is not allocated at function scope because it
  95                  * should only be allocated after num_additional_swms was
  96                  * checked to be the same as wim->hdr.total_parts.  Otherwise, it
  97                  * could be unexpectedly high and cause a stack overflow. */
  98                 WIMStruct *parts_to_swms[num_additional_swms];
  99                 ZERO_ARRAY(parts_to_swms);
 100                 for (unsigned i = 0; i < num_additional_swms; i++) {
 101
 102                         WIMStruct *swm = additional_swms[i];
 103
 104                         if (swm->compression_type != ctype) {
 105                                 ERROR("The split WIMs do not all have the same "
 106                                       "compression type");
 107                                 return WIMLIB_ERR_SPLIT_INVALID;
 108                         }
 109                         if (swm->chunk_size != chunk_size &&
 110                             ctype != WIMLIB_COMPRESSION_TYPE_NONE) {
 111                                 ERROR("The split WIMs do not all have the same "
 112                                       "chunk size");
 113                                 return WIMLIB_ERR_SPLIT_INVALID;
 114                         }
 115                         if (memcmp(guid, swm->hdr.guid, WIM_GUID_LEN) != 0) {
 116                                 ERROR("The split WIMs do not all have the same "
 117                                       "GUID");
 118                                 return WIMLIB_ERR_SPLIT_INVALID;
 119                         }
 120                         if (swm->hdr.part_number == 1) {
 121                                 ERROR("WIMs `%"TS"' and `%"TS"' both are marked "
 122                                       "as the first WIM in the spanned set",
 123                                       wim->filename, swm->filename);
 124                                 return WIMLIB_ERR_SPLIT_INVALID;
 125                         }
 126                         if (swm->hdr.part_number == 0 ||
 127                             swm->hdr.part_number > total_parts)
 128                         {
 129                                 ERROR("WIM `%"TS"' says it is part %u in the "
 130                                       "spanned set, but the part number must "
 131                                       "be in the range [1, %u]",
 132                                       swm->filename, swm->hdr.part_number, total_parts);
 133                                 return WIMLIB_ERR_SPLIT_INVALID;
 134                         }
 135                         if (parts_to_swms[swm->hdr.part_number - 2])
 136                         {
 137                                 ERROR("`%"TS"' and `%"TS"' are both marked as "
 138                                       "part %u of %u in the spanned set",
 139                                       parts_to_swms[swm->hdr.part_number - 2]->filename,
 140                                       swm->filename,
 141                                       swm->hdr.part_number,
 142                                       total_parts);
 143                                 return WIMLIB_ERR_SPLIT_INVALID;
 144                         } else {
 145                                 parts_to_swms[swm->hdr.part_number - 2] = swm;
 146                         }
 147                 }
 148         }
 149         return 0;
 150 }
 151
 152 /* API function documented in wimlib.h  */
 153 WIMLIBAPI int
 154 wimlib_join(const tchar * const *swm_names,
 155             unsigned num_swms,
 156             const tchar *output_path,
 157             int swm_open_flags,
 158             int wim_write_flags,
 159             wimlib_progress_func_t progress_func)
 160 {
 161         int ret;
 162         unsigned i;
 163         unsigned j;
 164         WIMStruct *swm0;
 165         WIMStruct **additional_swms;
 166         unsigned num_additional_swms;
 167
 168         if (num_swms < 1 || num_swms > 0xffff)
 169                 return WIMLIB_ERR_INVALID_PARAM;
 170         num_additional_swms = num_swms - 1;
 171
 172         additional_swms = CALLOC((num_additional_swms + 1),
 173                                  sizeof(additional_swms[0]));
 174         if (!additional_swms)
 175                 return WIMLIB_ERR_NOMEM;
 176
 177         swm0 = NULL;
 178         for (i = 0, j = 0; i < num_swms; i++) {
 179                 WIMStruct *swm;
 180
 181                 ret = wimlib_open_wim(swm_names[i], swm_open_flags, &swm,
 182                                       progress_func);
 183                 if (ret)
 184                         goto out_free_swms;
 185                 if (swm->hdr.part_number == 1 && swm0 == NULL)
 186                         swm0 = swm;
 187                 else
 188                         additional_swms[j++] = swm;
 189         }
 190
 191         if (!swm0) {
 192                 ERROR("Part 1 of the split WIM was not specified!");
 193                 ret = WIMLIB_ERR_SPLIT_INVALID;
 194                 goto out_free_swms;
 195         }
 196
 197         ret = verify_swm_set(swm0, additional_swms, num_additional_swms);
 198         if (ret)
 199                 goto out_free_swms;
 200
 201         ret = wimlib_reference_resources(swm0, additional_swms,
 202                                          num_additional_swms, 0);
 203         if (ret)
 204                 goto out_free_swms;
 205
 206         /* It is reasonably safe to provide, WIMLIB_WRITE_FLAG_STREAMS_OK, as we
 207          * have verified that the specified split WIM parts form a spanned set.
 208          */
 209         ret = wimlib_write(swm0, output_path, WIMLIB_ALL_IMAGES,
 210                            wim_write_flags |
 211                                 WIMLIB_WRITE_FLAG_STREAMS_OK |
 212                                 WIMLIB_WRITE_FLAG_RETAIN_GUID,
 213                            1, progress_func);
 214 out_free_swms:
 215         for (i = 0; i < num_additional_swms + 1; i++)
 216                 wimlib_free(additional_swms[i]);
 217         FREE(additional_swms);
 218         wimlib_free(swm0);
 219         return ret;
 220 }