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use std::fmt::{self, Debug}; use std::iter::{self}; use serde::{Serialize, Deserialize, Serializer, Deserializer}; use serde::ser::SerializeSeq; use serde::ser::Error as ser_Error; use serde::de::{self}; #[derive(Clone, Debug, PartialOrd, PartialEq, Ord, Eq, Hash)] pub struct StringZ { pub string: String, pub has_tail_zero: bool } impl Default for StringZ { fn default() -> StringZ { StringZ { string: String::default(), has_tail_zero: true } } } impl<T: Into<String>> From<T> for StringZ { fn from(t: T) -> StringZ { StringZ { string: t.into(), has_tail_zero: true } } } impl Serialize for StringZ { fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where S: Serializer { if serializer.is_human_readable() { let mut carets = self.string.len() - self.string.rfind(|x| x != '^') .map_or(0, |i| i + self.string[i..].chars().next().unwrap().len_utf8()); if !self.has_tail_zero { carets += 1; } let mut s = String::with_capacity(self.string.len() + carets); s.push_str(&self.string); s.extend(iter::repeat('^').take(carets)); serializer.serialize_str(&s) } else { if !self.has_tail_zero && self.string.as_bytes().last() == Some(&0) { return Err(S::Error::custom("zero-terminated string value has tail zero")); } let mut s = String::with_capacity(self.string.len() + if self.has_tail_zero { 1 } else { 0 }); s.push_str(&self.string); if self.has_tail_zero { s.push('\0'); } serializer.serialize_str(&s) } } } struct StringZDeserializer { is_human_readable: bool } impl<'de> de::Visitor<'de> for StringZDeserializer { type Value = StringZ; fn expecting(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, "string") } fn visit_str<E: de::Error>(self, v: &str) -> Result<Self::Value, E> { self.visit_string(v.into()) } fn visit_string<E: de::Error>(self, mut string: String) -> Result<Self::Value, E> { if self.is_human_readable { let carets = string.len() - string.rfind(|x| x != '^').map_or(0, |i| i + string[i..].chars().next().unwrap().len_utf8()); let has_tail_zero = carets % 2 == 0; let carets = (carets + 1) / 2; string.truncate(string.len() - carets); Ok(StringZ { string, has_tail_zero }) } else { let has_tail_zero = string.as_bytes().last() == Some(&0); if has_tail_zero { string.truncate(string.len() - 1); } Ok(StringZ { string, has_tail_zero }) } } } impl<'de> Deserialize<'de> for StringZ { fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> where D: Deserializer<'de> { let is_human_readable = deserializer.is_human_readable(); deserializer.deserialize_string(StringZDeserializer { is_human_readable }) } } #[derive(Clone, Debug, PartialOrd, PartialEq, Ord, Eq, Hash)] pub struct StringZList { pub vec: Vec<String>, pub has_tail_zero: bool } impl Default for StringZList { fn default() -> StringZList { StringZList { vec: Vec::default(), has_tail_zero: true } } } impl<T: Into<Vec<String>>> From<T> for StringZList { fn from(t: T) -> StringZList { StringZList { vec: t.into(), has_tail_zero: true } } } impl Serialize for StringZList { fn serialize<S>(&self, serializer: S) -> Result<S::Ok, S::Error> where S: Serializer { if serializer.is_human_readable() { let mut carets = self.vec.len() - self.vec.iter().rposition(|x| x != "^").map_or(0, |i| i + 1); if !self.has_tail_zero { carets += 1; } let mut serializer = serializer.serialize_seq(Some(self.vec.len() + carets))?; for s in &self.vec { serializer.serialize_element(s)?; } for _ in 0..carets { serializer.serialize_element("^")?; } serializer.end() } else { let mut capacity = 0; for s in &self.vec { if s.contains('\0') { return Err(S::Error::custom("zero-terminated string list item contains zero byte")); } capacity += s.len() + 1; } let mut text = String::with_capacity(capacity); for s in &self.vec { text.push_str(s); text.push('\0'); } if !self.has_tail_zero { text.truncate(text.len() - 1); } serializer.serialize_str(&text) } } } struct StringZListHRDeserializer; impl<'de> de::Visitor<'de> for StringZListHRDeserializer { type Value = StringZList; fn expecting(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, "string sequence") } fn visit_seq<A>(self, mut seq: A) -> Result<Self::Value, A::Error> where A: de::SeqAccess<'de> { let mut vec: Vec<String> = seq.size_hint().map_or_else(Vec::new, Vec::with_capacity); while let Some(line) = seq.next_element()? { vec.push(line); } let carets = vec.len() - vec.iter().rposition(|x| x != "^").map_or(0, |i| i + 1); let has_tail_zero = carets % 2 == 0; let carets = (carets + 1) / 2; vec.truncate(vec.len() - carets); Ok(StringZList { vec, has_tail_zero }) } } struct StringZListNHRDeserializer; impl<'de> de::Visitor<'de> for StringZListNHRDeserializer { type Value = StringZList; fn expecting(&self, f: &mut fmt::Formatter) -> fmt::Result { write!(f, "string") } fn visit_str<E: de::Error>(self, v: &str) -> Result<Self::Value, E> { let has_tail_zero = v.as_bytes().last() == Some(&0); let v = if has_tail_zero { &v[.. v.len() - 1] } else { v }; Ok(StringZList { vec: v.split('\0').map(|x| x.into()).collect(), has_tail_zero }) } } impl<'de> Deserialize<'de> for StringZList { fn deserialize<D>(deserializer: D) -> Result<Self, D::Error> where D: Deserializer<'de> { if deserializer.is_human_readable() { deserializer.deserialize_seq(StringZListHRDeserializer) } else { deserializer.deserialize_str(StringZListNHRDeserializer) } } } #[cfg(test)] mod tests { use crate::*; #[test] fn string_into_string_z() { let z = Field::StringZ(String::from("Y").into()); if let Field::StringZ(z) = z { assert_eq!(z.string, "Y"); } else { panic!() } let z = Field::StringZ("Y".into()); if let Field::StringZ(z) = z { assert_eq!(z.string, "Y"); } else { panic!() } } }