starkware-libs
diff --git a/‎crates/cairo-lang-utils/src/bigint.rs‎
Lines changed: 2 additions & 1 deletion b/‎crates/cairo-lang-utils/src/bigint.rs‎
Lines changed: 2 additions & 1 deletion
@@ -210,7 +210,8 @@ mod impl_parity_scale_codec {
             // sign + len packed in the same byte, it allows numbers of byte size up to 63 (2**504),
             // data.
             let bits = self.value.bits() as usize;
-            core::mem::size_of::<u8>() + bits.div_ceil(8)
+            // `encode` always emits at least one data byte (`0` encodes as `[0]`).
+            core::mem::size_of::<u8>() + bits.div_ceil(8).max(1)
         }
 
         /// /!\ Warning this function panics if the number encoded is too big (>= 2**504).
Original file line number	Diff line number	Diff line change
`@@ -210,7 +210,8 @@ mod impl_parity_scale_codec {`
`210`	`210`	`// sign + len packed in the same byte, it allows numbers of byte size up to 63 (2**504),`
`211`	`211`	`// data.`
`212`	`212`	`let bits = self.value.bits() as usize;`
`213`		`- core::mem::size_of::<u8>() + bits.div_ceil(8)`
	`213`	+ // `encode` always emits at least one data byte (`0` encodes as `[0]`).
	`214`	`+ core::mem::size_of::<u8>() + bits.div_ceil(8).max(1)`
`214`	`215`	`}`
`215`	`216`
`216`	`217`	`/// /!\ Warning this function panics if the number encoded is too big (>= 2**504).`