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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/error.h"
#include "sqfs/id_table.h"
#include "sqfs/io.h"
#include "sqfs/inode.h"
#include "sqfs/super.h"
#include "sqfs/xattr_reader.h"
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
int main(int argc, char **argv)
{
sqfs_xattr_reader_t *xattr = 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_tree_node_t *n = NULL;
sqfs_file_t *file = NULL;
sqfs_u8 *p, *output = NULL;
sqfs_compressor_config_t cfg;
sqfs_super_t super;
sqfs_u64 file_size;
int status = EXIT_FAILURE, ret;
if (argc != 3) {
fputs("Usage: extract_one <squashfs-file> <source-file-path>\n", stderr);
return EXIT_FAILURE;
}
file = sqfs_open_file(argv[1], SQFS_FILE_OPEN_READ_ONLY);
if (file == NULL) {
perror(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;
}
if (!(super.flags & SQFS_FLAG_NO_XATTRS)) {
xattr = sqfs_xattr_reader_create(0);
if (xattr == NULL) {
fprintf(stderr, "%s: error creating xattr reader: %d.\n", argv[1], SQFS_ERROR_ALLOC);
goto out;
}
ret = sqfs_xattr_reader_load(xattr, &super, file, cmp);
if (ret) {
fprintf(stderr, "%s: error loading xattr reader: %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;
}
ret = sqfs_dir_reader_get_full_hierarchy(dirrd, idtbl, argv[2], 0, &n);
if (ret) {
fprintf(stderr, "%s: error reading filesystem hierarchy: %d.\n", argv[1], ret);
goto out;
}
if (!S_ISREG(n->inode->base.mode)) {
fprintf(stderr, "/%s is not a file\n", argv[2]);
goto out;
}
sqfs_inode_get_file_size(n->inode, &file_size);
output = p = malloc(file_size);
if (output == NULL) {
fprintf(stderr, "malloc failed: %d\n", errno);
goto out;
}
for (size_t i = 0; i < sqfs_inode_get_file_block_count(n->inode); ++i) {
size_t chunk_size, read = (file_size < super.block_size) ? file_size : super.block_size;
sqfs_u8 *chunk;
ret = sqfs_data_reader_get_block(data, n->inode, i, &chunk_size, &chunk);
if (ret) {
fprintf(stderr, "reading data block: %d\n", ret);
goto out;
}
memcpy(p, chunk, chunk_size);
p += chunk_size;
free(chunk);
file_size -= read;
}
if (file_size > 0) {
size_t chunk_size;
sqfs_u8 *chunk;
ret = sqfs_data_reader_get_fragment(data, n->inode, &chunk_size, &chunk);
if (ret) {
fprintf(stderr, "reading fragment block: %d\n", ret);
goto out;
}
memcpy(p, chunk, chunk_size);
free(chunk);
}
/* for example simplicity, assume this is a text file */
fprintf(stdout, "%s\n", (char *)output);
status = EXIT_SUCCESS;
out:
sqfs_dir_tree_destroy(n);
sqfs_destroy(data);
sqfs_destroy(dirrd);
sqfs_destroy(idtbl);
sqfs_destroy(xattr);
sqfs_destroy(cmp);
sqfs_destroy(file);
free(output);
return status;
}
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