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/* SPDX-License-Identifier: 0BSD */
/*
* extract_one.c
*
* Copyright (C) 2021 Luca Boccassi <luca.boccassi@microsoft.com>
*/
#include "sqfs/compressor.h"
#include "sqfs/data_reader.h"
#include "sqfs/dir_reader.h"
#include "sqfs/dir_entry.h"
#include "sqfs/error.h"
#include "sqfs/id_table.h"
#include "sqfs/io.h"
#include "sqfs/inode.h"
#include "sqfs/super.h"
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
static int find_file(sqfs_dir_iterator_t *it, const char *path,
sqfs_istream_t **out)
{
const char *end = strchr(path, '/');
size_t len = end == NULL ? strlen(path) : (size_t)(end - path);
for (;;) {
sqfs_dir_entry_t *ent;
int ret;
ret = it->next(it, &ent);
if (ret < 0) {
fputs("error reading directory entry\n", stderr);
return -1;
}
if (ret > 0) {
fputs("entry not found\n", stderr);
return -1;
}
if (strncmp(ent->name, path, len) != 0 ||
ent->name[len] != '\0') {
free(ent);
continue;
}
if (end == NULL) {
ret = it->open_file_ro(it, out);
if (ret) {
fprintf(stderr, "%s: error opening file %d\n",
ent->name, ret);
}
} else {
sqfs_dir_iterator_t *sub;
ret = it->open_subdir(it, &sub);
if (ret != 0) {
fprintf(stderr, "%s: error opening subdir\n",
ent->name);
} else {
ret = find_file(sub, end + 1, out);
sqfs_drop(sub);
}
}
free(ent);
return ret;
}
}
int main(int argc, char **argv)
{
sqfs_inode_generic_t *iroot = NULL;
sqfs_data_reader_t *data = NULL;
sqfs_dir_reader_t *dirrd = NULL;
sqfs_compressor_t *cmp = NULL;
sqfs_id_table_t *idtbl = NULL;
sqfs_file_t *file = NULL;
sqfs_dir_iterator_t *it = NULL;
sqfs_compressor_config_t cfg;
sqfs_super_t super;
int status = EXIT_FAILURE, ret;
sqfs_istream_t *is = NULL;
char buffer[512];
if (argc != 3) {
fputs("Usage: extract_one <squashfs-file> <source-file-path>\n", stderr);
return EXIT_FAILURE;
}
ret = sqfs_file_open(&file, argv[1], SQFS_FILE_OPEN_READ_ONLY);
if (ret) {
fprintf(stderr, "%s: error opening file.\n", argv[1]);
return EXIT_FAILURE;
}
ret = sqfs_super_read(&super, file);
if (ret) {
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;
}
idtbl = sqfs_id_table_create(0);
if (idtbl == NULL) {
fprintf(stderr, "%s: error creating ID table: %d.\n", argv[1], ret);
goto out;
}
ret = sqfs_id_table_read(idtbl, file, &super, cmp);
if (ret) {
fprintf(stderr, "%s: error loading ID table: %d.\n", argv[1], ret);
goto out;
}
dirrd = sqfs_dir_reader_create(&super, cmp, file, 0);
if (dirrd == NULL) {
fprintf(stderr, "%s: error creating dir reader: %d.\n", argv[1], SQFS_ERROR_ALLOC);
goto out;
}
data = sqfs_data_reader_create(file, super.block_size, cmp, 0);
if (data == NULL) {
fprintf(stderr, "%s: error creating data reader: %d.\n", argv[1], SQFS_ERROR_ALLOC);
goto out;
}
ret = sqfs_data_reader_load_fragment_table(data, &super);
if (ret) {
fprintf(stderr, "%s: error loading fragment table: %d.\n", argv[1], ret);
goto out;
}
if (sqfs_dir_reader_get_root_inode(dirrd, &iroot)) {
fprintf(stderr, "%s: error reading root inode.\n", argv[1]);
goto out;
}
ret = sqfs_dir_iterator_create(dirrd, idtbl, data, NULL, iroot, &it);
free(iroot);
if (ret) {
fprintf(stderr, "%s: error creating root iterator.\n",
argv[2]);
goto out;
}
if (find_file(it, argv[2], &is))
goto out;
for (;;) {
ret = sqfs_istream_read(is, buffer, sizeof(buffer));
if (ret < 0) {
fprintf(stderr, "%s: read error!\n", argv[2]);
goto out;
}
if (ret == 0)
break;
fwrite(buffer, 1, ret, stdout);
}
status = EXIT_SUCCESS;
out:
sqfs_drop(is);
sqfs_drop(it);
sqfs_drop(data);
sqfs_drop(dirrd);
sqfs_drop(idtbl);
sqfs_drop(cmp);
sqfs_drop(file);
return status;
}
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