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add overflow handler to big reads (to fake big disks)

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This commit is contained in:
bunnie 2025-09-30 17:28:42 +08:00
parent 9ee10257f6
commit dec6c1944b
1 changed files with 19 additions and 2 deletions
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21
libs/bao1x-hal/src/usb/driver.rs
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@ -971,7 +971,14 @@ impl CorigineUsb {
if let Some(ap) = &self.app_ptr[pei] { Some(ap.ep as usize) } else { None }
}
pub fn setup_big_read(&mut self, app_buf: &mut [u8], disk: &[u8], offset: usize, length: usize) {
pub fn setup_big_read(
&mut self,
app_buf: &mut [u8],
disk: &[u8],
offset: usize,
length: usize,
overflow_handler: Option<fn(&mut [u8], usize)>,
) {
crate::println!(
"BIG READ offset {:x} len {:x} app_buf: {:x} disk: {:x?}",
offset,
@ -988,7 +995,17 @@ impl CorigineUsb {
self.remaining_rd = None;
0
};
app_buf[..actual_len].copy_from_slice(&disk[offset..offset + actual_len as usize]);
if (offset + actual_len as usize) < disk.len() {
app_buf[..actual_len].copy_from_slice(&disk[offset..offset + actual_len as usize]);
} else {
if let Some(handler) = overflow_handler {
handler(&mut app_buf[..actual_len], offset);
} else {
// just return zeroes if we're reading "beyond" the actual disk (for uf2 oversized disk
// compatibility)
app_buf[..actual_len].fill(0);
}
}
self.bulk_xfer(1, USB_SEND, app_buf.as_ptr() as usize, actual_len, 0, chain);
}