4 * Split a WIM file into parts.
8 * Copyright (C) 2012, 2013 Eric Biggers
10 * This file is part of wimlib, a library for working with WIM files.
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)
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
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/.
26 #include "wimlib_internal.h"
27 #include "lookup_table.h"
29 #include "buffer_io.h"
34 size_t swm_base_name_len;
35 const tchar *swm_suffix;
36 struct list_head lte_list;
41 wimlib_progress_func_t progress_func;
42 union wimlib_progress_info progress;
46 finish_swm(WIMStruct *w, struct list_head *lte_list,
47 int write_flags, wimlib_progress_func_t progress_func)
51 ret = write_lookup_table_from_stream_list(lte_list, w->out_fd,
52 &w->hdr.lookup_table_res_entry);
55 return finish_write(w, WIMLIB_ALL_IMAGES,
56 write_flags | WIMLIB_WRITE_FLAG_NO_LOOKUP_TABLE,
61 copy_resource_to_swm(struct wim_lookup_table_entry *lte, void *__args)
63 struct split_args *args = (struct split_args*)__args;
64 WIMStruct *w = args->w;
67 /* metadata resources were already written. */
68 if (lte->resource_entry.flags & WIM_RESHDR_FLAG_METADATA)
71 if (args->size_remaining < 0 ||
72 (u64)args->size_remaining < lte->resource_entry.size) {
74 /* No space for this resource. Finish the previous swm and
77 ret = finish_swm(w, &args->lte_list, args->write_flags,
82 if (args->progress_func) {
83 args->progress_func(WIMLIB_PROGRESS_MSG_SPLIT_END_PART,
87 INIT_LIST_HEAD(&args->lte_list);
88 args->cur_part_number++;
90 tsprintf(args->swm_base_name + args->swm_base_name_len, T("%d%"TS),
91 args->cur_part_number, args->swm_suffix);
93 w->hdr.part_number = args->cur_part_number;
95 if (args->progress_func) {
96 args->progress.split.cur_part_number = args->cur_part_number;
97 args->progress_func(WIMLIB_PROGRESS_MSG_SPLIT_BEGIN_PART,
101 ret = begin_write(w, args->swm_base_name, args->write_flags);
104 args->size_remaining = args->part_size;
106 args->size_remaining -= lte->resource_entry.size;
107 args->progress.split.completed_bytes += lte->resource_entry.size;
108 list_add_tail(<e->swm_stream_list, &args->lte_list);
109 return copy_resource(lte, w);
112 /* Splits the WIM file @w into multiple parts prefixed by @swm_name with size at
113 * most @part_size bytes. */
115 wimlib_split(WIMStruct *w, const tchar *swm_name,
116 size_t part_size, int write_flags,
117 wimlib_progress_func_t progress_func)
120 struct wim_header hdr_save;
121 struct split_args args;
122 const tchar *swm_suffix;
124 size_t swm_base_name_len;
126 if (!swm_name || part_size == 0)
127 return WIMLIB_ERR_INVALID_PARAM;
129 if (w->hdr.total_parts != 1)
130 return WIMLIB_ERR_SPLIT_UNSUPPORTED;
132 write_flags &= WIMLIB_WRITE_MASK_PUBLIC;
134 ret = wim_checksum_unhashed_streams(w);
138 swm_name_len = tstrlen(swm_name);
139 tchar swm_base_name[swm_name_len + 20];
141 memcpy(&hdr_save, &w->hdr, sizeof(struct wim_header));
142 w->hdr.flags |= WIM_HDR_FLAG_SPANNED;
144 randomize_byte_array(w->hdr.guid, WIM_GID_LEN);
145 ret = begin_write(w, swm_name, write_flags);
149 tmemcpy(swm_base_name, swm_name, swm_name_len + 1);
151 swm_suffix = tstrchr(swm_name, T('.'));
153 swm_base_name_len = swm_suffix - swm_name;
155 swm_base_name_len = swm_name_len;
156 swm_base_name[ARRAY_LEN(swm_base_name) - 1] = T('\0');
157 swm_suffix = &swm_base_name[ARRAY_LEN(swm_base_name) - 1];
161 args.swm_base_name = swm_base_name;
162 args.swm_base_name_len = swm_base_name_len;
163 args.swm_suffix = swm_suffix;
164 INIT_LIST_HEAD(&args.lte_list);
165 args.cur_part_number = 1;
166 args.write_flags = write_flags;
167 args.size_remaining = part_size;
168 args.part_size = part_size;
169 args.progress_func = progress_func;
170 args.progress.split.total_bytes = lookup_table_total_stream_size(w->lookup_table);
171 args.progress.split.cur_part_number = 1;
172 args.progress.split.completed_bytes = 0;
173 args.progress.split.part_name = swm_base_name;
176 progress_func(WIMLIB_PROGRESS_MSG_SPLIT_BEGIN_PART,
180 for (int i = 0; i < w->hdr.image_count; i++) {
181 struct wim_lookup_table_entry *metadata_lte;
182 metadata_lte = w->image_metadata[i]->metadata_lte;
183 ret = copy_resource(metadata_lte, w);
186 args.size_remaining -= metadata_lte->resource_entry.size;
187 args.progress.split.completed_bytes += metadata_lte->resource_entry.size;
188 /* Careful: The metadata lookup table entries must be added in
189 * order of the images. */
190 list_add_tail(&metadata_lte->swm_stream_list, &args.lte_list);
193 ret = for_lookup_table_entry_pos_sorted(w->lookup_table,
194 copy_resource_to_swm,
199 ret = finish_swm(w, &args.lte_list, write_flags, progress_func);
204 progress_func(WIMLIB_PROGRESS_MSG_SPLIT_END_PART,
208 /* The swms are all ready now, except the total_parts and part_number
209 * fields in their headers are wrong (since we don't know the total
210 * parts until they are all written). Fix them. */
211 int total_parts = args.cur_part_number;
212 for (int i = 1; i <= total_parts; i++) {
213 const tchar *part_name;
215 part_name = swm_name;
217 tsprintf(swm_base_name + swm_base_name_len, T("%d%"TS),
219 part_name = swm_base_name;
222 FILE *fp = tfopen(part_name, T("r+b"));
224 ERROR_WITH_ERRNO("Failed to open `%"TS"'", part_name);
225 ret = WIMLIB_ERR_OPEN;
230 put_u16(&buf[2], total_parts);
232 if (fseek(fp, 40, SEEK_SET) != 0 ||
233 fwrite(buf, 1, sizeof(buf), fp) != sizeof(buf) ||
236 ERROR_WITH_ERRNO("Error overwriting header of `%"TS"'",
238 ret = WIMLIB_ERR_WRITE;
243 close_wim_writable(w);
244 memcpy(&w->hdr, &hdr_save, sizeof(struct wim_header));