Function decode 

pub fn decode(bytes: &[u8]) -> Result<(i64, usize), BinaryError>

Decodes a LEB128 VarInt from a byte slice.

Returns a tuple of (decoded_value, bytes_consumed) on success.

Performance

This function includes fast paths for common cases:

• Single-byte values (no continuation bit)
• Two-byte values

Errors

Returns BinaryError::InvalidVarInt if:

• The input is empty
• The VarInt encoding is invalid (too many bytes)
• The continuation bit pattern is malformed

Examples

assert_eq!(varint::decode(&[0x00]).unwrap(), (0, 1));
assert_eq!(varint::decode(&[0xFF, 0x00]).unwrap(), (127, 2));
assert_eq!(varint::decode(&[0x80, 0x01]).unwrap(), (128, 2));
assert_eq!(varint::decode(&[0xC4, 0xF1, 0x00]).unwrap(), (14532, 3));