101 lines
2.5 KiB
Rust
101 lines
2.5 KiB
Rust
use nix::sys::stat;
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use nix::sys::stat::{FileStat, SFlag};
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use std::fs::{File, OpenOptions};
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use std::io;
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use std::io::{Seek, Write};
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use std::os::unix::io::AsRawFd;
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use std::path::Path;
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use tempfile::tempfile;
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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: &Path) -> bool {
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match stat::stat(path) {
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Ok(info) => is_file_or_blk(info),
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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: &Path) -> 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: &Path) -> 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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_ => fail("stat failed"),
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}
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}
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//---------------------------------------
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fn set_size<W: Write + Seek>(w: &mut W, nr_bytes: u64) -> io::Result<()> {
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let zeroes: Vec<u8> = vec![0; 1];
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if nr_bytes > 0 {
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w.seek(io::SeekFrom::Start(nr_bytes - 1))?;
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w.write_all(&zeroes)?;
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}
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Ok(())
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}
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pub fn temp_file_sized(nr_bytes: u64) -> io::Result<std::fs::File> {
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let mut file = tempfile()?;
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set_size(&mut file, nr_bytes)?;
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Ok(file)
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}
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pub fn create_sized_file(path: &Path, nr_bytes: u64) -> io::Result<std::fs::File> {
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let mut file = OpenOptions::new()
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.read(false)
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.write(true)
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.create(true)
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.truncate(true)
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.open(path)?;
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set_size(&mut file, nr_bytes)?;
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Ok(file)
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}
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//---------------------------------------
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