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fix: ensure that there is room for length header in byte array #18

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fix: ensure that there is room for length header in byte array #18

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8 changes: 4 additions & 4 deletions wasm-thumbnail/src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -34,12 +34,12 @@ pub extern "C" fn resize_and_pad(
let slice: &[u8] = unsafe { std::slice::from_raw_parts(pointer, length) };

let mut out: Cursor<Vec<u8>> = Cursor::new(Vec::with_capacity(nsize));
// Reserve space at the start for length header
let _ = out.write_all(&[0,0,0,0]);
// Add additional space at the start for the length header
out.get_mut().extend_from_slice(&[0,0,0,0]);

match _resize_and_pad(slice, &mut out, nwidth, nheight, nsize, nquality) {
Ok(thumbnail_len) => {
out.get_mut().splice(..4, thumbnail_len.to_be_bytes().iter().cloned());
out.get_mut()[0..4].copy_from_slice(&thumbnail_len.to_be_bytes());
}
_ => {
panic!("Image too large")
Expand Down Expand Up @@ -95,4 +95,4 @@ pub extern "C" fn deallocate(pointer: *mut c_void, capacity: usize) {
unsafe {
let _ = Vec::from_raw_parts(pointer, 0, capacity);
}
}
}
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