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)
49 off_t lookup_table_offset = ftello(w->out_fp);
51 struct wim_lookup_table_entry *lte;
53 list_for_each_entry(lte, lte_list, staging_list) {
54 ret = write_lookup_table_entry(lte, w->out_fp);
59 off_t xml_data_offset = ftello(w->out_fp);
61 if (lookup_table_offset == -1 || xml_data_offset == -1)
62 return WIMLIB_ERR_WRITE;
63 w->hdr.lookup_table_res_entry.offset = lookup_table_offset;
64 w->hdr.lookup_table_res_entry.size =
65 xml_data_offset - lookup_table_offset;
66 w->hdr.lookup_table_res_entry.original_size =
67 xml_data_offset - lookup_table_offset;
68 w->hdr.lookup_table_res_entry.flags = WIM_RESHDR_FLAG_METADATA;
69 return finish_write(w, WIMLIB_ALL_IMAGES,
70 write_flags | WIMLIB_WRITE_FLAG_NO_LOOKUP_TABLE,
75 copy_resource_to_swm(struct wim_lookup_table_entry *lte, void *__args)
77 struct split_args *args = (struct split_args*)__args;
78 WIMStruct *w = args->w;
81 /* metadata resources were already written. */
82 if (lte->resource_entry.flags & WIM_RESHDR_FLAG_METADATA)
85 if (args->size_remaining < 0 ||
86 (u64)args->size_remaining < lte->resource_entry.size) {
88 /* No space for this resource. Finish the previous swm and
91 ret = finish_swm(w, &args->lte_list, args->write_flags,
96 if (args->progress_func) {
97 args->progress_func(WIMLIB_PROGRESS_MSG_SPLIT_END_PART,
101 INIT_LIST_HEAD(&args->lte_list);
102 args->cur_part_number++;
104 tsprintf(args->swm_base_name + args->swm_base_name_len, T("%d%"TS),
105 args->cur_part_number, args->swm_suffix);
107 w->hdr.part_number = args->cur_part_number;
109 if (args->progress_func) {
110 args->progress.split.cur_part_number = args->cur_part_number;
111 args->progress_func(WIMLIB_PROGRESS_MSG_SPLIT_BEGIN_PART,
115 ret = begin_write(w, args->swm_base_name, args->write_flags);
118 args->size_remaining = args->part_size;
120 args->size_remaining -= lte->resource_entry.size;
121 args->progress.split.completed_bytes += lte->resource_entry.size;
122 list_add(<e->staging_list, &args->lte_list);
123 return copy_resource(lte, w);
126 /* Splits the WIM file @w into multiple parts prefixed by @swm_name with size at
127 * most @part_size bytes. */
129 wimlib_split(WIMStruct *w, const tchar *swm_name,
130 size_t part_size, int write_flags,
131 wimlib_progress_func_t progress_func)
134 struct wim_header hdr_save;
135 struct split_args args;
136 const tchar *swm_suffix;
138 size_t swm_base_name_len;
140 if (!swm_name || part_size == 0)
141 return WIMLIB_ERR_INVALID_PARAM;
143 if (w->hdr.total_parts != 1)
144 return WIMLIB_ERR_SPLIT_UNSUPPORTED;
146 write_flags &= WIMLIB_WRITE_MASK_PUBLIC;
148 swm_name_len = tstrlen(swm_name);
149 tchar swm_base_name[swm_name_len + 20];
151 memcpy(&hdr_save, &w->hdr, sizeof(struct wim_header));
152 w->hdr.flags |= WIM_HDR_FLAG_SPANNED;
154 randomize_byte_array(w->hdr.guid, WIM_GID_LEN);
155 ret = begin_write(w, swm_name, write_flags);
159 tmemcpy(swm_base_name, swm_name, swm_name_len + 1);
161 swm_suffix = tstrchr(swm_name, T('.'));
163 swm_base_name_len = swm_suffix - swm_name;
165 swm_base_name_len = swm_name_len;
166 swm_base_name[ARRAY_LEN(swm_base_name) - 1] = T('\0');
167 swm_suffix = &swm_base_name[ARRAY_LEN(swm_base_name) - 1];
171 args.swm_base_name = swm_base_name;
172 args.swm_base_name_len = swm_base_name_len;
173 args.swm_suffix = swm_suffix;
174 INIT_LIST_HEAD(&args.lte_list);
175 args.cur_part_number = 1;
176 args.write_flags = write_flags;
177 args.size_remaining = part_size;
178 args.part_size = part_size;
179 args.progress_func = progress_func;
180 args.progress.split.total_bytes = lookup_table_total_stream_size(w->lookup_table);
181 args.progress.split.cur_part_number = 1;
182 args.progress.split.completed_bytes = 0;
183 args.progress.split.part_name = swm_base_name;
186 progress_func(WIMLIB_PROGRESS_MSG_SPLIT_BEGIN_PART,
190 w->write_metadata = true;
191 for (int i = 0; i < w->hdr.image_count; i++) {
192 struct wim_lookup_table_entry *metadata_lte;
193 metadata_lte = w->image_metadata[i].metadata_lte;
194 ret = copy_resource(metadata_lte, w);
197 args.size_remaining -= metadata_lte->resource_entry.size;
198 args.progress.split.completed_bytes += metadata_lte->resource_entry.size;
199 list_add(&metadata_lte->staging_list, &args.lte_list);
201 w->write_metadata = false;
203 ret = for_lookup_table_entry(w->lookup_table,
204 copy_resource_to_swm, &args);
208 ret = finish_swm(w, &args.lte_list, write_flags, progress_func);
213 progress_func(WIMLIB_PROGRESS_MSG_SPLIT_END_PART,
217 /* The swms are all ready now, except the total_parts and part_number
218 * fields in their headers are wrong (since we don't know the total
219 * parts until they are all written). Fix them. */
220 int total_parts = args.cur_part_number;
221 for (int i = 1; i <= total_parts; i++) {
222 const tchar *part_name;
224 part_name = swm_name;
226 tsprintf(swm_base_name + swm_base_name_len, T("%d%"TS),
228 part_name = swm_base_name;
231 FILE *fp = tfopen(part_name, T("r+b"));
233 ERROR_WITH_ERRNO("Failed to open `%"TS"'", part_name);
234 ret = WIMLIB_ERR_OPEN;
239 put_u16(&buf[2], total_parts);
241 if (fseek(fp, 40, SEEK_SET) != 0 ||
242 fwrite(buf, 1, sizeof(buf), fp) != sizeof(buf) ||
245 ERROR_WITH_ERRNO("Error overwriting header of `%"TS"'",
247 ret = WIMLIB_ERR_WRITE;
252 close_wim_writable(w);
253 memcpy(&w->hdr, &hdr_save, sizeof(struct wim_header));