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/* SPDX-License-Identifier: 0BSD */
/*
* list_files.c
*
* Copyright (C) 2020 David Oberhollenzer <goliath@infraroot.at>
*/
#include "sqfs/compressor.h"
#include "sqfs/dir_reader.h"
#include "sqfs/dir_entry.h"
#include "sqfs/id_table.h"
#include "sqfs/inode.h"
#include "sqfs/super.h"
#include "sqfs/io.h"
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <stdio.h>
static int count_entries(sqfs_dir_iterator_t *it, unsigned int *out)
{
sqfs_dir_entry_t *ent;
int ret;
*out = 0;
for (;;) {
ret = it->next(it, &ent);
if (ret < 0) {
*out = 0;
return -1;
}
if (ret > 0)
break;
*out += 1;
free(ent);
}
return 0;
}
static void write_tree_dfs(sqfs_dir_iterator_t *it,
unsigned int mask, unsigned int level,
unsigned int count)
{
sqfs_dir_entry_t *ent;
unsigned int i;
sqfs_u16 type;
while (count--) {
for (i = 0; i < level; ++i)
fputs(mask & (1 << i) ? "│ " : " ", stdout);
if (it->next(it, &ent) != 0)
break;
fputs(count == 0 ? "└─ " : "├─ ", stdout);
fputs(ent->name, stdout);
type = ent->mode & SQFS_INODE_MODE_MASK;
free(ent);
if (type == SQFS_INODE_MODE_LNK) {
char *target;
if (it->read_link(it, &target) == 0)
printf(" ⭢ %s", target);
free(target);
}
fputc('\n', stdout);
if (type == SQFS_INODE_MODE_DIR) {
sqfs_dir_iterator_t *sub;
unsigned int sub_count;
it->open_subdir(it, &sub);
count_entries(sub, &sub_count);
sub = sqfs_drop(sub);
it->open_subdir(it, &sub);
write_tree_dfs(sub,
mask | (count > 0 ? (1 << level) : 0),
level + 1, sub_count);
sqfs_drop(sub);
}
}
}
static sqfs_dir_iterator_t *create_root_iterator(sqfs_dir_reader_t *dr,
sqfs_id_table_t *idtbl,
const char *filename)
{
sqfs_inode_generic_t *iroot;
sqfs_dir_iterator_t *it;
int ret;
if (sqfs_dir_reader_get_root_inode(dr, &iroot)) {
fprintf(stderr, "%s: error reading root inode.\n",
filename);
return NULL;
}
ret = sqfs_dir_iterator_create(dr, idtbl, NULL, NULL, iroot, &it);
free(iroot);
if (ret) {
fprintf(stderr, "%s: error creating root iterator.\n",
filename);
return NULL;
}
return it;
}
int main(int argc, char **argv)
{
int ret, status = EXIT_FAILURE;
sqfs_dir_iterator_t *it = NULL;
sqfs_compressor_t *cmp = NULL;
sqfs_id_table_t *idtbl = NULL;
sqfs_dir_reader_t *dr = NULL;
sqfs_compressor_config_t cfg;
sqfs_file_t *file = NULL;
unsigned int root_count;
sqfs_super_t super;
/* open the SquashFS file we want to read */
if (argc != 2) {
fputs("Usage: list_files <squashfs-file>\n", stderr);
return EXIT_FAILURE;
}
if (sqfs_file_open(&file, argv[1], SQFS_FILE_OPEN_READ_ONLY)) {
fprintf(stderr, "%s: error opening file.\n", argv[1]);
return EXIT_FAILURE;
}
/* read the super block, create a compressor and
process the compressor options */
if (sqfs_super_read(&super, file)) {
fprintf(stderr, "%s: error reading super block.\n", argv[1]);
goto out;
}
sqfs_compressor_config_init(&cfg, super.compression_id,
super.block_size,
SQFS_COMP_FLAG_UNCOMPRESS);
ret = sqfs_compressor_create(&cfg, &cmp);
if (ret != 0) {
fprintf(stderr, "%s: error creating compressor: %d.\n",
argv[1], ret);
goto out;
}
/* Create and read the UID/GID mapping table */
idtbl = sqfs_id_table_create(0);
if (idtbl == NULL) {
fputs("Error creating ID table.\n", stderr);
goto out;
}
if (sqfs_id_table_read(idtbl, file, &super, cmp)) {
fprintf(stderr, "%s: error loading ID table.\n", argv[1]);
goto out;
}
/* create a directory reader */
dr = sqfs_dir_reader_create(&super, cmp, file, 0);
if (dr == NULL) {
fprintf(stderr, "%s: error creating directory reader.\n",
argv[1]);
goto out;
}
/* create a directory iterator for the root inode */
it = create_root_iterator(dr, idtbl, argv[1]);
if (it == NULL)
goto out;
if (count_entries(it, &root_count)) {
fprintf(stderr, "%s: error counting root iterator entries.\n",
argv[1]);
goto out;
}
it = sqfs_drop(it);
it = create_root_iterator(dr, idtbl, argv[1]);
if (it == NULL)
goto out;
/* fancy print the hierarchy */
printf("/\n");
write_tree_dfs(it, 0, 0, root_count);
/* cleanup */
status = EXIT_SUCCESS;
out:
sqfs_drop(it);
sqfs_drop(dr);
sqfs_drop(idtbl);
sqfs_drop(cmp);
sqfs_drop(file);
return status;
}
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