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use core::fmt::{self, Display};
use core::marker::PhantomData;
use managed::ManagedSlice;
use super::{Connection, GdbStub, GdbStubImpl, Target};
#[derive(Debug)]
pub enum GdbStubBuilderError {
MissingPacketBuffer,
PacketBufSizeMismatch,
}
impl Display for GdbStubBuilderError {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
use self::GdbStubBuilderError::*;
match self {
MissingPacketBuffer => write!(f, "Must provide buffer using `with_packet_buffer`."),
PacketBufSizeMismatch => write!(
f,
"`packet_buffer_size` is larger than `with_packet_buffer`'s size."
),
}
}
}
#[cfg(feature = "std")]
impl std::error::Error for GdbStubBuilderError {}
pub struct GdbStubBuilder<'a, T: Target, C: Connection> {
conn: C,
packet_buffer: Option<&'a mut [u8]>,
packet_buffer_size: Option<usize>,
_target: PhantomData<T>,
}
impl<'a, T: Target, C: Connection> GdbStubBuilder<'a, T, C> {
pub fn new(conn: C) -> GdbStubBuilder<'static, T, C> {
GdbStubBuilder {
conn,
packet_buffer: None,
packet_buffer_size: None,
_target: PhantomData,
}
}
pub fn with_packet_buffer(mut self, packet_buffer: &'a mut [u8]) -> Self {
self.packet_buffer = Some(packet_buffer);
self
}
pub fn packet_buffer_size(mut self, size: usize) -> Self {
self.packet_buffer_size = Some(size);
self
}
pub fn build(self) -> Result<GdbStub<'a, T, C>, GdbStubBuilderError> {
let (packet_buffer, packet_buffer_len) = match self.packet_buffer {
Some(buf) => {
let len = match self.packet_buffer_size {
Some(custom_len) => {
if custom_len > buf.len() {
return Err(GdbStubBuilderError::PacketBufSizeMismatch);
} else {
custom_len
}
}
None => buf.len(),
};
(ManagedSlice::Borrowed(buf), len)
}
None => {
cfg_if::cfg_if! {
if #[cfg(feature = "alloc")] {
use alloc::vec::Vec;
let len = self.packet_buffer_size.unwrap_or(4096);
(ManagedSlice::Owned(Vec::with_capacity(len)), len)
} else {
return Err(GdbStubBuilderError::MissingPacketBuffer);
}
}
}
};
Ok(GdbStub {
conn: self.conn,
packet_buffer,
state: GdbStubImpl::new(packet_buffer_len),
})
}
}