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#include "nonstd.h"
#include "squashfs_fs.h"
#include "squashfuse.h"
#include "stat.h"
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <sys/stat.h>
#define PROGNAME "squashfuse_extract"
#define ERR_MISC (1)
#define ERR_USAGE (2)
#define ERR_OPEN (3)
static void usage() {
fprintf(stderr, "Usage: %s ARCHIVE PATH_TO_EXTRACT\n", PROGNAME);
fprintf(stderr, " %s ARCHIVE -a\n", PROGNAME);
exit(ERR_USAGE);
}
static void die(const char *msg) {
fprintf(stderr, "%s\n", msg);
exit(ERR_MISC);
}
static bool starts_with(const char *pre, const char *str)
{
size_t lenpre = strlen(pre),
lenstr = strlen(str);
return lenstr < lenpre ? false : strncmp(pre, str, lenpre) == 0;
}
int main(int argc, char *argv[]) {
sqfs_err err = SQFS_OK;
sqfs_traverse trv;
sqfs fs;
char *image;
char *path_to_extract;
char *prefix;
char prefixed_path_to_extract[1024];
struct stat st;
prefix = "squashfs-root/";
if (access(prefix, F_OK ) == -1 ) {
if (mkdir(prefix, 0777) == -1) {
perror("mkdir error");
exit(EXIT_FAILURE);
}
}
if (argc != 3)
usage();
image = argv[1];
path_to_extract = argv[2];
if ((err = sqfs_open_image(&fs, image, 0)))
exit(ERR_OPEN);
if ((err = sqfs_traverse_open(&trv, &fs, sqfs_inode_root(&fs))))
die("sqfs_traverse_open error");
while (sqfs_traverse_next(&trv, &err)) {
if (!trv.dir_end) {
if ((starts_with(path_to_extract, trv.path) != 0) || (strcmp("-a", path_to_extract) == 0)){
fprintf(stderr, "trv.path: %s\n", trv.path);
fprintf(stderr, "sqfs_inode_id: %llu\n", (unsigned long long)trv.entry.inode);
sqfs_inode inode;
if (sqfs_inode_get(&fs, &inode, trv.entry.inode))
die("sqfs_inode_get error");
fprintf(stderr, "inode.base.inode_type: %i\n", inode.base.inode_type);
fprintf(stderr, "inode.xtra.reg.file_size: %llu\n", (unsigned long long)inode.xtra.reg.file_size);
strcpy(prefixed_path_to_extract, "");
strcat(strcat(prefixed_path_to_extract, prefix), trv.path);
if (inode.base.inode_type == SQUASHFS_DIR_TYPE){
fprintf(stderr, "inode.xtra.dir.parent_inode: %ui\n", inode.xtra.dir.parent_inode);
fprintf(stderr, "mkdir: %s/\n", prefixed_path_to_extract);
if (access(prefixed_path_to_extract, F_OK ) == -1 ) {
if (mkdir(prefixed_path_to_extract, 0777) == -1) {
perror("mkdir error");
exit(1);
}
}
} else if (inode.base.inode_type == SQUASHFS_REG_TYPE){
fprintf(stderr, "Extract to: %s\n", prefixed_path_to_extract);
if (sqfs_stat(&fs, &inode, &st) != 0)
die("sqfs_stat error");
printf("Permissions: ");
printf( (S_ISDIR(st.st_mode)) ? "d" : "-");
printf( (st.st_mode & S_IRUSR) ? "r" : "-");
printf( (st.st_mode & S_IWUSR) ? "w" : "-");
printf( (st.st_mode & S_IXUSR) ? "x" : "-");
printf( (st.st_mode & S_IRGRP) ? "r" : "-");
printf( (st.st_mode & S_IWGRP) ? "w" : "-");
printf( (st.st_mode & S_IXGRP) ? "x" : "-");
printf( (st.st_mode & S_IROTH) ? "r" : "-");
printf( (st.st_mode & S_IWOTH) ? "w" : "-");
printf( (st.st_mode & S_IXOTH) ? "x" : "-");
printf("\n");
// Read the file in chunks
off_t bytes_already_read = 0;
sqfs_off_t bytes_at_a_time = 64*1024;
FILE * f;
f = fopen (prefixed_path_to_extract, "w+");
if (f == NULL)
die("fopen error");
while (bytes_already_read < inode.xtra.reg.file_size)
{
char buf[bytes_at_a_time];
if (sqfs_read_range(&fs, &inode, (sqfs_off_t) bytes_already_read, &bytes_at_a_time, buf))
die("sqfs_read_range error");
// fwrite(buf, 1, bytes_at_a_time, stdout);
fwrite(buf, 1, bytes_at_a_time, f);
bytes_already_read = bytes_already_read + bytes_at_a_time;
}
fclose(f);
chmod (prefixed_path_to_extract, st.st_mode);
} else if (inode.base.inode_type == SQUASHFS_SYMLINK_TYPE){
size_t size = strlen(trv.path)+1;
char buf[size];
int ret = sqfs_readlink(&fs, &inode, buf, &size);
if (ret != 0)
die("sqfs_readlink error");
fprintf(stderr, "Symlink: %s to %s \n", prefixed_path_to_extract, buf);
unlink(prefixed_path_to_extract);
ret = sqfs_symlink(buf, prefixed_path_to_extract);
if (ret != 0)
die("symlink error");
} else {
fprintf(stderr, "TODO: Implement inode.base.inode_type %i\n", inode.base.inode_type);
}
fprintf(stderr, "\n");
}
}
}
if (err)
die("sqfs_traverse_next error");
sqfs_traverse_close(&trv);
sqfs_fd_close(fs.fd);
return 0;
}
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