72 lines
1.8 KiB
Rust
72 lines
1.8 KiB
Rust
use nix::sys::stat;
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use nix::sys::stat::{FileStat, SFlag};
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use std::io;
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use std::fs::File;
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use std::os::unix::io::AsRawFd;
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//---------------------------------------
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fn check_bits(mode: u32, flag: &SFlag) -> bool {
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(mode & flag.bits()) != 0
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}
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pub fn is_file_or_blk(info: FileStat) -> bool {
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check_bits(info.st_mode, &stat::SFlag::S_IFBLK) ||
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check_bits(info.st_mode, &stat::SFlag::S_IFREG)
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}
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pub fn file_exists(path: &str) -> bool {
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match stat::stat(path) {
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Ok(info) => {
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is_file_or_blk(info)
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}
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_ => {
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// FIXME: assuming all errors indicate the file doesn't
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// exist.
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false
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}
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}
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}
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//---------------------------------------
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const BLKGETSIZE64_CODE: u8 = 0x12;
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const BLKGETSIZE64_SEQ: u8 = 114;
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ioctl_read!(ioctl_blkgetsize64, BLKGETSIZE64_CODE, BLKGETSIZE64_SEQ, u64);
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pub fn fail<T>(msg: &str) -> io::Result<T> {
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let e = io::Error::new(io::ErrorKind::Other, msg);
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Err(e)
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}
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fn get_device_size(path: &str) -> io::Result<u64> {
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let file = File::open(path)?;
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let fd = file.as_raw_fd();
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let mut cap = 0u64;
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unsafe {
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match ioctl_blkgetsize64(fd, &mut cap) {
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Ok(_) => {Ok(cap)}
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_ => {fail("BLKGETSIZE64 ioctl failed")}
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}
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}
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}
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pub fn file_size(path: &str) -> io::Result<u64> {
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match stat::stat(path) {
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Ok(info) => {
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if check_bits(info.st_mode, &SFlag::S_IFREG) {
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Ok(info.st_size as u64)
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} else if check_bits(info.st_mode, &SFlag::S_IFBLK) {
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get_device_size(path)
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} else {
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fail("not a regular file or block device")
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}
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}
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_ => {
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fail("stat failed")
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}
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}
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}
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//---------------------------------------
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