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/* SPDX-License-Identifier: GPL-3.0-or-later */
/*
* readdir.c
*
* Copyright (C) 2019 David Oberhollenzer <goliath@infraroot.at>
*/
#include "config.h"
#include "meta_reader.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
int meta_reader_read_dir_header(meta_reader_t *m, sqfs_dir_header_t *hdr)
{
if (meta_reader_read(m, hdr, sizeof(*hdr)))
return -1;
hdr->count = le32toh(hdr->count);
hdr->start_block = le32toh(hdr->start_block);
hdr->inode_number = le32toh(hdr->inode_number);
if (hdr->count > (SQFS_MAX_DIR_ENT - 1)) {
fputs("Found a directory header with too many entries\n",
stderr);
return -1;
}
return 0;
}
sqfs_dir_entry_t *meta_reader_read_dir_ent(meta_reader_t *m)
{
sqfs_dir_entry_t ent, *out;
uint16_t *diff_u16;
if (meta_reader_read(m, &ent, sizeof(ent)))
return NULL;
diff_u16 = (uint16_t *)&ent.inode_diff;
*diff_u16 = le16toh(*diff_u16);
ent.offset = le16toh(ent.offset);
ent.type = le16toh(ent.type);
ent.size = le16toh(ent.size);
out = calloc(1, sizeof(*out) + ent.size + 2);
if (out == NULL) {
perror("reading dir entry");
return NULL;
}
*out = ent;
if (meta_reader_read(m, out->name, ent.size + 1)) {
free(out);
return NULL;
}
if (strchr((char *)out->name, '/') != NULL ||
strchr((char *)out->name, '\\') != NULL) {
fputs("Found a file name that contains slashes\n", stderr);
free(out);
return NULL;
}
if (strcmp((char *)out->name, "..") == 0 ||
strcmp((char *)out->name, ".") == 0) {
fputs("Found '..' or '.' in file names\n", stderr);
free(out);
return NULL;
}
return out;
}
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