4 * Split a WIM file into parts.
8 * Copyright (C) 2012 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 char *swm_suffix;
36 struct list_head lte_list;
41 wimlib_progress_func_t progress_func;
42 union wimlib_progress_info progress;
45 static int finish_swm(WIMStruct *w, struct list_head *lte_list,
46 int write_flags, wimlib_progress_func_t progress_func)
48 off_t lookup_table_offset = ftello(w->out_fp);
50 struct lookup_table_entry *lte;
52 list_for_each_entry(lte, lte_list, staging_list) {
53 ret = write_lookup_table_entry(lte, w->out_fp);
58 off_t xml_data_offset = ftello(w->out_fp);
60 if (lookup_table_offset == -1 || xml_data_offset == -1)
61 return WIMLIB_ERR_WRITE;
62 w->hdr.lookup_table_res_entry.offset = lookup_table_offset;
63 w->hdr.lookup_table_res_entry.size =
64 xml_data_offset - lookup_table_offset;
65 w->hdr.lookup_table_res_entry.original_size =
66 xml_data_offset - lookup_table_offset;
67 w->hdr.lookup_table_res_entry.flags = WIM_RESHDR_FLAG_METADATA;
68 return finish_write(w, WIMLIB_ALL_IMAGES,
69 write_flags | WIMLIB_WRITE_FLAG_NO_LOOKUP_TABLE,
73 static int copy_resource_to_swm(struct lookup_table_entry *lte, void *__args)
75 struct split_args *args = (struct split_args*)__args;
76 WIMStruct *w = args->w;
79 /* metadata resources were already written. */
80 if (lte->resource_entry.flags & WIM_RESHDR_FLAG_METADATA)
83 if (args->size_remaining < 0 ||
84 (u64)args->size_remaining < lte->resource_entry.size) {
86 /* No space for this resource. Finish the previous swm and
89 ret = finish_swm(w, &args->lte_list, args->write_flags,
94 if (args->progress_func) {
95 args->progress_func(WIMLIB_PROGRESS_MSG_SPLIT_END_PART,
99 INIT_LIST_HEAD(&args->lte_list);
100 args->cur_part_number++;
102 sprintf(args->swm_base_name + args->swm_base_name_len, "%d%s",
103 args->cur_part_number, args->swm_suffix);
105 w->hdr.part_number = args->cur_part_number;
107 if (args->progress_func) {
108 args->progress.split.cur_part_number = args->cur_part_number;
109 args->progress_func(WIMLIB_PROGRESS_MSG_SPLIT_BEGIN_PART,
113 ret = begin_write(w, args->swm_base_name, args->write_flags);
116 args->size_remaining = args->part_size;
118 args->size_remaining -= lte->resource_entry.size;
119 args->progress.split.completed_bytes += lte->resource_entry.size;
120 list_add(<e->staging_list, &args->lte_list);
121 return copy_resource(lte, w);
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(WIMStruct *w, const char *swm_name,
127 size_t part_size, int write_flags,
128 wimlib_progress_func_t progress_func)
131 struct wim_header hdr_save;
132 struct split_args args;
133 const char *swm_suffix;
135 size_t swm_base_name_len;
137 if (!swm_name || part_size == 0)
138 return WIMLIB_ERR_INVALID_PARAM;
140 if (w->hdr.total_parts != 1)
141 return WIMLIB_ERR_SPLIT_UNSUPPORTED;
143 write_flags &= WIMLIB_WRITE_MASK_PUBLIC;
145 swm_name_len = strlen(swm_name);
146 char swm_base_name[swm_name_len + 20];
148 memcpy(&hdr_save, &w->hdr, sizeof(struct wim_header));
149 w->hdr.flags |= WIM_HDR_FLAG_SPANNED;
151 randomize_byte_array(w->hdr.guid, WIM_GID_LEN);
152 ret = begin_write(w, swm_name, write_flags);
156 memcpy(swm_base_name, swm_name, swm_name_len + 1);
158 swm_suffix = strchr(swm_name, '.');
160 swm_base_name_len = swm_suffix - swm_name;
162 swm_base_name_len = swm_name_len;
163 swm_base_name[sizeof(swm_base_name) - 1] = '\0';
164 swm_suffix = &swm_base_name[sizeof(swm_base_name) - 1];
168 args.swm_base_name = swm_base_name;
169 args.swm_base_name_len = swm_base_name_len;
170 args.swm_suffix = swm_suffix;
171 INIT_LIST_HEAD(&args.lte_list);
172 args.cur_part_number = 1;
173 args.write_flags = write_flags;
174 args.size_remaining = part_size;
175 args.part_size = part_size;
176 args.progress_func = progress_func;
177 args.progress.split.total_bytes = lookup_table_total_stream_size(w->lookup_table);
178 args.progress.split.cur_part_number = 1;
179 args.progress.split.completed_bytes = 0;
180 args.progress.split.part_name = swm_base_name;
183 progress_func(WIMLIB_PROGRESS_MSG_SPLIT_BEGIN_PART,
187 w->write_metadata = true;
188 for (int i = 0; i < w->hdr.image_count; i++) {
189 struct lookup_table_entry *metadata_lte;
190 metadata_lte = w->image_metadata[i].metadata_lte;
191 ret = copy_resource(metadata_lte, w);
194 args.size_remaining -= metadata_lte->resource_entry.size;
195 args.progress.split.completed_bytes += metadata_lte->resource_entry.size;
196 list_add(&metadata_lte->staging_list, &args.lte_list);
198 w->write_metadata = false;
200 ret = for_lookup_table_entry(w->lookup_table,
201 copy_resource_to_swm, &args);
205 ret = finish_swm(w, &args.lte_list, write_flags, progress_func);
210 progress_func(WIMLIB_PROGRESS_MSG_SPLIT_END_PART,
214 /* The swms are all ready now, except the total_parts and part_number
215 * fields in their headers are wrong (we don't know the total parts
216 * until they are all written). Fix them. */
217 int total_parts = args.cur_part_number;
218 for (int i = 1; i <= total_parts; i++) {
219 const char *part_name;
221 part_name = swm_name;
223 sprintf(swm_base_name + swm_base_name_len, "%d%s",
225 part_name = swm_base_name;
228 FILE *fp = fopen(part_name, "r+b");
230 ERROR_WITH_ERRNO("Failed to open `%s'", part_name);
231 ret = WIMLIB_ERR_OPEN;
236 put_u16(&buf[2], total_parts);
238 if (fseek(fp, 40, SEEK_SET) != 0 ||
239 fwrite(buf, 1, sizeof(buf), fp) != sizeof(buf)
240 || fclose(fp) != 0) {
241 ERROR_WITH_ERRNO("Error overwriting header of `%s'",
243 ret = WIMLIB_ERR_WRITE;
248 close_wim_writable(w);
249 memcpy(&w->hdr, &hdr_save, sizeof(struct wim_header));