X-Git-Url: http://git.bitcoin.ninja/index.cgi?a=blobdiff_plain;f=lightning%2Fsrc%2Futil%2Fser.rs;h=fb0d0ad8e44e9eb40d203c50b4cf2efaa8af88a3;hb=5a79d6cc53031abeac33ef2042847860414f8ea0;hp=707ca2b326d0d5720cae5abec48885e443b46a59;hpb=0ecb4b093ac1134cbf06275cc48dd79ef7524774;p=rust-lightning

diff --git a/lightning/src/util/ser.rs b/lightning/src/util/ser.rs
index 707ca2b3..fb0d0ad8 100644
--- a/lightning/src/util/ser.rs
+++ b/lightning/src/util/ser.rs
@@ -43,6 +43,7 @@ use crate::ln::msgs::PartialSignatureWithNonce;
 use crate::ln::{PaymentPreimage, PaymentHash, PaymentSecret};
 
 use crate::util::byte_utils::{be48_to_array, slice_to_be48};
+use crate::util::string::UntrustedString;
 
 /// serialization buffer size
 pub const MAX_BUF_SIZE: usize = 64 * 1024;
@@ -629,6 +630,21 @@ impl<'a> From<&'a String> for WithoutLength<&'a String> {
 	fn from(s: &'a String) -> Self { Self(s) }
 }
 
+
+impl Writeable for WithoutLength<&UntrustedString> {
+	#[inline]
+	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
+		WithoutLength(&self.0.0).write(w)
+	}
+}
+impl Readable for WithoutLength<UntrustedString> {
+	#[inline]
+	fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
+		let s: WithoutLength<String> = Readable::read(r)?;
+		Ok(Self(UntrustedString(s.0)))
+	}
+}
+
 impl<'a, T: Writeable> Writeable for WithoutLength<&'a Vec<T>> {
 	#[inline]
 	fn write<W: Writer>(&self, writer: &mut W) -> Result<(), io::Error> {
@@ -1349,6 +1365,50 @@ impl Readable for Duration {
 	}
 }
 
+/// A wrapper for a `Transaction` which can only be constructed with [`TransactionU16LenLimited::new`]
+/// if the `Transaction`'s consensus-serialized length is <= u16::MAX.
+///
+/// Use [`TransactionU16LenLimited::into_transaction`] to convert into the contained `Transaction`.
+#[derive(Clone, Debug, PartialEq, Eq)]
+pub struct TransactionU16LenLimited(Transaction);
+
+impl TransactionU16LenLimited {
+	/// Constructs a new `TransactionU16LenLimited` from a `Transaction` only if it's consensus-
+	/// serialized length is <= u16::MAX.
+	pub fn new(transaction: Transaction) -> Result<Self, ()> {
+		if transaction.serialized_length() > (u16::MAX as usize) {
+			Err(())
+		} else {
+			Ok(Self(transaction))
+		}
+	}
+
+	/// Consumes this `TransactionU16LenLimited` and returns its contained `Transaction`.
+	pub fn into_transaction(self) -> Transaction {
+		self.0
+	}
+}
+
+impl Writeable for TransactionU16LenLimited {
+	fn write<W: Writer>(&self, w: &mut W) -> Result<(), io::Error> {
+		(self.0.serialized_length() as u16).write(w)?;
+		self.0.write(w)
+	}
+}
+
+impl Readable for TransactionU16LenLimited {
+	fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
+		let len = <u16 as Readable>::read(r)?;
+		let mut tx_reader = FixedLengthReader::new(r, len as u64);
+		let tx: Transaction = Readable::read(&mut tx_reader)?;
+		if tx_reader.bytes_remain() {
+			Err(DecodeError::BadLengthDescriptor)
+		} else {
+			Ok(Self(tx))
+		}
+	}
+}
+
 #[cfg(test)]
 mod tests {
 	use core::convert::TryFrom;