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Allow bos_descriptor_buf to be a zero-length slice

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Maxime Vincent 2024-08-29 17:32:43 +02:00
parent f0a8607051
commit abcb39a58b
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1 changed files with 6 additions and 0 deletions
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6
embassy-usb/src/descriptor.rs
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@ -308,6 +308,9 @@ impl<'a> BosWriter<'a> {
} }
pub(crate) fn bos(&mut self) { pub(crate) fn bos(&mut self) {
if (self.writer.buf.len() - self.writer.position) < 5 {
return;
}
self.num_caps_mark = Some(self.writer.position + 4); self.num_caps_mark = Some(self.writer.position + 4);
self.writer.write( self.writer.write(
descriptor_type::BOS, descriptor_type::BOS,
@ -350,6 +353,9 @@ impl<'a> BosWriter<'a> {
} }
pub(crate) fn end_bos(&mut self) { pub(crate) fn end_bos(&mut self) {
if self.writer.position == 0 {
return;
}
self.num_caps_mark = None; self.num_caps_mark = None;
let position = self.writer.position as u16; let position = self.writer.position as u16;
self.writer.buf[2..4].copy_from_slice(&position.to_le_bytes()); self.writer.buf[2..4].copy_from_slice(&position.to_le_bytes());