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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* mknode.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "fstree.h"
#include "util.h"
#include <string.h>
#include <stdlib.h>
#include <errno.h>
tree_node_t *fstree_mknode(fstree_t *fs, tree_node_t *parent, const char *name,
size_t name_len, const char *extra,
const struct stat *sb)
{
size_t size = sizeof(tree_node_t), block_count = 0, total;
tree_node_t *n;
char *ptr;
switch (sb->st_mode & S_IFMT) {
case S_IFLNK:
if (extra == NULL) {
errno = EINVAL;
return NULL;
}
if (SZ_ADD_OV(size, strlen(extra), &size) ||
SZ_ADD_OV(size, 1, &size)) {
goto fail_ov;
}
break;
case S_IFDIR:
if (SZ_ADD_OV(size, sizeof(*n->data.dir), &size))
goto fail_ov;
break;
case S_IFREG:
block_count = (sb->st_size / fs->block_size);
if ((sb->st_size % fs->block_size) != 0)
++block_count;
if (SZ_MUL_OV(block_count, sizeof(n->data.file->blocks[0]),
&total)) {
goto fail_ov;
}
if (SZ_ADD_OV(size, sizeof(*n->data.file), &size) ||
SZ_ADD_OV(size, total, &size)) {
goto fail_ov;
}
if (extra != NULL) {
if (SZ_ADD_OV(size, strlen(extra), &size) ||
SZ_ADD_OV(size, 1, &size)) {
goto fail_ov;
}
}
break;
}
if (SZ_ADD_OV(size, name_len, &total) ||
SZ_ADD_OV(total, 1, &total)) {
goto fail_ov;
}
n = calloc(1, total);
if (n == NULL)
return NULL;
if (parent != NULL) {
n->next = parent->data.dir->children;
parent->data.dir->children = n;
n->parent = parent;
}
n->uid = sb->st_uid;
n->gid = sb->st_gid;
n->mode = sb->st_mode;
n->mod_time = sb->st_mtime;
switch (sb->st_mode & S_IFMT) {
case S_IFDIR:
n->data.dir = (dir_info_t *)n->payload;
break;
case S_IFREG:
n->data.file = (file_info_t *)n->payload;
n->data.file->size = sb->st_size;
n->data.file->fragment = 0xFFFFFFFF;
n->data.file->fragment_offset = 0xFFFFFFFF;
if (extra == NULL)
break;
ptr = (char *)n->data.file->blocks;
ptr += block_count * sizeof(n->data.file->blocks[0]);
n->data.file->input_file = ptr;
strcpy(n->data.file->input_file, extra);
break;
case S_IFLNK:
n->mode = S_IFLNK | 0777;
n->data.slink_target = (char *)n->payload;
if (extra != NULL)
strcpy(n->data.slink_target, extra);
break;
case S_IFBLK:
case S_IFCHR:
n->data.devno = sb->st_rdev;
break;
}
n->name = (char *)n + size;
memcpy(n->name, name, name_len);
return n;
fail_ov:
errno = EOVERFLOW;
return NULL;
}
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