M-Labs/rust-fatfs
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Limit file size to 4GB when writting

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This commit is contained in:
Rafał Harabień 2018-06-09 19:32:15 +02:00
parent 18b9d8c285
commit 4f6ed94cb3
1 changed files with 5 additions and 0 deletions
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5
src/file.rs
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@ -1,4 +1,5 @@
use core::cmp; use core::cmp;
use core;
use io::prelude::*; use io::prelude::*;
use io::{SeekFrom, ErrorKind}; use io::{SeekFrom, ErrorKind};
use io; use io;
@ -6,6 +7,8 @@ use io;
use fs::FileSystemRef; use fs::FileSystemRef;
use dir_entry::{DirEntryEditor, DateTime, Date}; use dir_entry::{DirEntryEditor, DateTime, Date};
const MAX_FILE_SIZE: u32 = core::u32::MAX;
/// FAT file used for reading and writing. /// FAT file used for reading and writing.
#[derive(Clone)] #[derive(Clone)]
pub struct File<'a, 'b: 'a> { pub struct File<'a, 'b: 'a> {
@ -193,7 +196,9 @@ impl<'a, 'b> Write for File<'a, 'b> {
let cluster_size = self.fs.cluster_size(); let cluster_size = self.fs.cluster_size();
let offset_in_cluster = self.offset % cluster_size; let offset_in_cluster = self.offset % cluster_size;
let bytes_left_in_cluster = (cluster_size - offset_in_cluster) as usize; let bytes_left_in_cluster = (cluster_size - offset_in_cluster) as usize;
let bytes_left_until_max_file_size = (MAX_FILE_SIZE - self.offset) as usize;
let write_size = cmp::min(buf.len(), bytes_left_in_cluster); let write_size = cmp::min(buf.len(), bytes_left_in_cluster);
let write_size = cmp::min(write_size, bytes_left_until_max_file_size);
// Exit early if we are going to write no data // Exit early if we are going to write no data
if write_size == 0 { if write_size == 0 {
return Ok(0); return Ok(0);