EC
ErrorKind::UnexpectedEof
RustERRORNotableI/O

Unexpected end of file

Quick Answer

Ensure the data source sends the complete payload; validate lengths before reading.

What this means

A read expected more bytes but the stream ended prematurely.

Why it happens
  1. 1Peer closed connection mid-transfer
  2. 2Truncated file
  3. 3read_exact() called with a buffer larger than available data

Fix

Use read_to_end for unknown-length data

Use read_to_end for unknown-length data
use std::io::Read;
let mut buf = Vec::new();
// read_to_end won't error on EOF, read_exact will
reader.read_to_end(&mut buf)?;

Why this works

read_to_end accumulates bytes until EOF without requiring an exact count.

Code examples
Triggerrust
let mut buf = [0u8; 100];
reader.read_exact(&mut buf)?; // fails if < 100 bytes
Same error in other languages
EOFErrorin Python→
Sources

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