formatted rlp.rs
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debris
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commit
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224
src/rlp.rs
224
src/rlp.rs
@ -54,31 +54,37 @@ use vector::InsertSlice;
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#[derive(Debug)]
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pub struct Rlp<'a> {
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bytes: &'a [u8],
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cache: Cell<OffsetCache>
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cache: Cell<OffsetCache>,
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}
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/// rlp offset
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#[derive(Copy, Clone, Debug)]
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struct OffsetCache {
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index: usize,
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offset: usize
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offset: usize,
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}
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impl OffsetCache {
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fn new(index: usize, offset: usize) -> OffsetCache {
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OffsetCache { index: index, offset: offset }
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OffsetCache {
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index: index,
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offset: offset,
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}
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}
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}
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/// stores basic information about item
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struct ItemInfo {
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prefix_len: usize,
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value_len: usize
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value_len: usize,
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}
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impl ItemInfo {
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fn new(prefix_len: usize, value_len: usize) -> ItemInfo {
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ItemInfo { prefix_len: prefix_len, value_len: value_len }
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ItemInfo {
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prefix_len: prefix_len,
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value_len: value_len,
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}
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}
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}
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@ -91,7 +97,9 @@ pub enum DecoderError {
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BadRlp,
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}
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impl StdError for DecoderError {
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fn description(&self) -> &str { "builder error" }
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fn description(&self) -> &str {
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"builder error"
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}
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}
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impl fmt::Display for DecoderError {
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@ -101,7 +109,9 @@ impl fmt::Display for DecoderError {
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}
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impl From<FromBytesError> for DecoderError {
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fn from(err: FromBytesError) -> DecoderError { DecoderError::FromBytesError(err) }
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fn from(err: FromBytesError) -> DecoderError {
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DecoderError::FromBytesError(err)
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}
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}
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impl<'a> Rlp<'a> {
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@ -109,7 +119,7 @@ impl <'a>Rlp<'a> {
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pub fn new(bytes: &'a [u8]) -> Rlp<'a> {
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Rlp {
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bytes: bytes,
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cache: Cell::new(OffsetCache::new(usize::max_value(), 0))
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cache: Cell::new(OffsetCache::new(usize::max_value(), 0)),
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}
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}
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@ -126,7 +136,7 @@ impl <'a>Rlp<'a> {
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let c = self.cache.get();
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let (mut bytes, to_skip) = match c.index <= index {
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true => (try!(Rlp::consume(self.bytes, c.offset)), index - c.index),
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false => (try!(self.consume_list_prefix()), index)
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false => (try!(self.consume_list_prefix()), index),
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};
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// skip up to x items
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@ -190,13 +200,13 @@ impl <'a>Rlp<'a> {
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let prefix_len = 1 + len_of_len;
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let value_len = try!(usize::from_bytes(&bytes[1..prefix_len]));
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ItemInfo::new(prefix_len, value_len)
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},
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_ => return Err(DecoderError::BadRlp)
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}
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_ => return Err(DecoderError::BadRlp),
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};
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match item.prefix_len + item.value_len <= bytes.len() {
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true => Ok(item),
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false => Err(DecoderError::RlpIsTooShort)
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false => Err(DecoderError::RlpIsTooShort),
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}
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}
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@ -204,7 +214,7 @@ impl <'a>Rlp<'a> {
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fn consume(bytes: &'a [u8], len: usize) -> Result<&'a [u8], DecoderError> {
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match bytes.len() >= len {
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true => Ok(&bytes[len..]),
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false => Err(DecoderError::RlpIsTooShort)
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false => Err(DecoderError::RlpIsTooShort),
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}
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}
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}
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@ -212,7 +222,7 @@ impl <'a>Rlp<'a> {
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/// non-consuming rlp iterator
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pub struct RlpIterator<'a> {
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rlp: &'a Rlp<'a>,
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index: usize
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index: usize,
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}
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impl<'a> IntoIterator for &'a Rlp<'a> {
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@ -220,7 +230,10 @@ impl <'a> IntoIterator for &'a Rlp<'a> {
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type IntoIter = RlpIterator<'a>;
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fn into_iter(self) -> Self::IntoIter {
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RlpIterator { rlp: self, index: 0 }
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RlpIterator {
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rlp: self,
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index: 0,
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}
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}
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}
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@ -236,7 +249,9 @@ impl <'a> Iterator for RlpIterator<'a> {
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}
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/// shortcut function to decode a Rlp `&[u8]` into an object
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pub fn decode<T>(bytes: &[u8]) -> Result<T, DecoderError> where T: Decodable {
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pub fn decode<T>(bytes: &[u8]) -> Result<T, DecoderError>
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where T: Decodable
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{
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let rlp = Rlp::new(bytes);
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T::decode(&rlp)
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}
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@ -245,20 +260,22 @@ pub trait Decodable: Sized {
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fn decode(rlp: &Rlp) -> Result<Self, DecoderError>;
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}
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impl <T> Decodable for T where T: FromBytes {
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impl<T> Decodable for T where T: FromBytes
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{
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fn decode(rlp: &Rlp) -> Result<Self, DecoderError> {
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match rlp.is_value() {
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true => BasicDecoder::read_value(rlp.bytes),
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false => Err(DecoderError::RlpExpectedToBeValue)
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false => Err(DecoderError::RlpExpectedToBeValue),
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}
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}
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}
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impl <T> Decodable for Vec<T> where T: Decodable {
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impl<T> Decodable for Vec<T> where T: Decodable
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{
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fn decode(rlp: &Rlp) -> Result<Self, DecoderError> {
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match rlp.is_list() {
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true => rlp.iter().map(|rlp| T::decode(&rlp)).collect(),
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false => Err(DecoderError::RlpExpectedToBeList)
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false => Err(DecoderError::RlpExpectedToBeList),
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}
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}
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}
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@ -270,7 +287,9 @@ pub trait Decoder {
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struct BasicDecoder;
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impl Decoder for BasicDecoder {
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fn read_value<T>(bytes: &[u8]) -> Result<T, DecoderError> where T: FromBytes {
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fn read_value<T>(bytes: &[u8]) -> Result<T, DecoderError>
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where T: FromBytes
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{
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match bytes.first().map(|&x| x) {
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// rlp is too short
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None => Err(DecoderError::RlpIsTooShort),
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@ -284,8 +303,8 @@ impl Decoder for BasicDecoder {
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let begin_of_value = 1 as usize + len_of_len;
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let len = try!(usize::from_bytes(&bytes[1..begin_of_value]));
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Ok(try!(T::from_bytes(&bytes[begin_of_value..begin_of_value + len])))
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},
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_ => Err(DecoderError::BadRlp)
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}
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_ => Err(DecoderError::BadRlp),
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}
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}
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}
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@ -294,7 +313,7 @@ impl Decoder for BasicDecoder {
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struct ListInfo {
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position: usize,
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current: usize,
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max: usize
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max: usize,
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}
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impl ListInfo {
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@ -302,7 +321,7 @@ impl ListInfo {
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ListInfo {
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position: position,
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current: 0,
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max: max
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max: max,
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}
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}
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}
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@ -310,7 +329,7 @@ impl ListInfo {
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/// container that should be used to encode rlp
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pub struct RlpStream {
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unfinished_lists: LinkedList<ListInfo>,
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encoder: BasicEncoder
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encoder: BasicEncoder,
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}
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impl RlpStream {
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@ -319,7 +338,7 @@ impl RlpStream {
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pub fn new() -> RlpStream {
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RlpStream {
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unfinished_lists: LinkedList::new(),
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encoder: BasicEncoder::new()
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encoder: BasicEncoder::new(),
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}
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}
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@ -331,7 +350,9 @@ impl RlpStream {
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}
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/// apends value to the end of stream, chainable
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pub fn append<'a, E>(&'a mut self, object: &E) -> &'a mut RlpStream where E: Encodable {
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pub fn append<'a, E>(&'a mut self, object: &E) -> &'a mut RlpStream
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where E: Encodable
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{
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// encode given value and add it at the end of the stream
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object.encode(&mut self.encoder);
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@ -351,8 +372,8 @@ impl RlpStream {
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// we may finish, if the appended list len is equal 0
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self.encoder.bytes.push(0xc0u8);
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self.try_to_finish();
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},
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_ => self.unfinished_lists.push_back(ListInfo::new(position, len))
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}
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_ => self.unfinished_lists.push_back(ListInfo::new(position, len)),
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}
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// return chainable self
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@ -368,7 +389,7 @@ impl RlpStream {
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pub fn out(self) -> Result<Vec<u8>, EncoderError> {
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match self.is_finished() {
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true => Ok(self.encoder.out()),
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false => Err(EncoderError::StreamIsUnfinished)
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false => Err(EncoderError::StreamIsUnfinished),
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}
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}
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@ -392,7 +413,9 @@ impl RlpStream {
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}
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/// shortcut function to encode a `T: Encodable` into a Rlp `Vec<u8>`
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pub fn encode<E>(object: &E) -> Vec<u8> where E: Encodable {
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pub fn encode<E>(object: &E) -> Vec<u8>
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where E: Encodable
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{
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let mut encoder = BasicEncoder::new();
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object.encode(&mut encoder);
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encoder.out()
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@ -400,11 +423,13 @@ pub fn encode<E>(object: &E) -> Vec<u8> where E: Encodable {
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#[derive(Debug)]
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pub enum EncoderError {
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StreamIsUnfinished
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StreamIsUnfinished,
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}
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impl StdError for EncoderError {
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fn description(&self) -> &str { "encoder error" }
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fn description(&self) -> &str {
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"encoder error"
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}
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}
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impl fmt::Display for EncoderError {
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@ -422,14 +447,20 @@ pub trait Encoder {
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fn emit_list<F>(&mut self, f: F) -> () where F: FnOnce(&mut Self) -> ();
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}
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impl <T> Encodable for T where T: ToBytes {
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fn encode<E>(&self, encoder: &mut E) -> () where E: Encoder {
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impl<T> Encodable for T where T: ToBytes
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{
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fn encode<E>(&self, encoder: &mut E) -> ()
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where E: Encoder
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{
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encoder.emit_value(&self.to_bytes())
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}
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}
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impl <'a, T> Encodable for &'a [T] where T: Encodable + 'a {
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fn encode<E>(&self, encoder: &mut E) -> () where E: Encoder {
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impl<'a, T> Encodable for &'a [T] where T: Encodable + 'a
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{
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fn encode<E>(&self, encoder: &mut E) -> ()
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where E: Encoder
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{
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encoder.emit_list(|e| {
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// insert all list elements
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for el in self.iter() {
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@ -439,15 +470,18 @@ impl <'a, T> Encodable for &'a [T] where T: Encodable + 'a {
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}
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}
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impl <T> Encodable for Vec<T> where T: Encodable {
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fn encode<E>(&self, encoder: &mut E) -> () where E: Encoder {
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impl<T> Encodable for Vec<T> where T: Encodable
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{
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fn encode<E>(&self, encoder: &mut E) -> ()
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where E: Encoder
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{
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let r: &[T] = self.as_ref();
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r.encode(encoder)
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}
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}
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struct BasicEncoder {
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bytes: Vec<u8>
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bytes: Vec<u8>,
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}
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impl BasicEncoder {
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@ -497,7 +531,9 @@ impl Encoder for BasicEncoder {
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}
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}
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fn emit_list<F>(&mut self, f: F) -> () where F: FnOnce(&mut Self) -> () {
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fn emit_list<F>(&mut self, f: F) -> ()
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where F: FnOnce(&mut Self) -> ()
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{
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// get len before inserting a list
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let before_len = self.bytes.len();
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@ -527,7 +563,8 @@ mod tests {
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{
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let rlp = Rlp::new(&data);
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assert!(rlp.is_list());
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let animals = <Vec<String> as rlp::Decodable>::decode(&rlp).unwrap();
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let animals =
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<Vec<String> as rlp::Decodable>::decode(&rlp).unwrap();
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assert_eq!(animals, vec!["cat".to_string(), "dog".to_string()]);
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let cat = rlp.at(0).unwrap();
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@ -588,7 +625,9 @@ mod tests {
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struct ETestPair<T>(T, Vec<u8>) where T: rlp::Encodable;
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fn run_encode_tests<T>(tests: Vec<ETestPair<T>>) where T: rlp::Encodable {
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fn run_encode_tests<T>(tests: Vec<ETestPair<T>>)
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where T: rlp::Encodable
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{
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for t in &tests {
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let res = rlp::encode(&t.0);
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assert_eq!(res, &t.1[..]);
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@ -641,34 +680,34 @@ mod tests {
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#[test]
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fn encode_u256() {
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let tests = vec![
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ETestPair(U256::from(0u64), vec![0x80u8]),
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let tests = vec![ETestPair(U256::from(0u64), vec![0x80u8]),
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ETestPair(U256::from(0x1000000u64), vec![0x84, 0x01, 0x00, 0x00, 0x00]),
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ETestPair(U256::from(0xffffffffu64), vec![0x84, 0xff, 0xff, 0xff, 0xff]),
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ETestPair(U256::from_str("8090a0b0c0d0e0f00910203040506077000000000000000100000000000012f0").unwrap(),
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ETestPair(U256::from(0xffffffffu64),
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vec![0x84, 0xff, 0xff, 0xff, 0xff]),
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ETestPair(U256::from_str("8090a0b0c0d0e0f00910203040506077000000000000\
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000100000000000012f0")
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.unwrap(),
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vec![0xa0, 0x80, 0x90, 0xa0, 0xb0, 0xc0, 0xd0, 0xe0, 0xf0,
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0x09, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x77,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x12, 0xf0])
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];
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0x09, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x77, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00,
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0x00, 0x00, 0x00, 0x00, 0x12, 0xf0])];
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run_encode_tests(tests);
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}
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#[test]
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fn encode_str() {
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let tests = vec![
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ETestPair("cat", vec![0x83, b'c', b'a', b't']),
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let tests = vec![ETestPair("cat", vec![0x83, b'c', b'a', b't']),
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ETestPair("dog", vec![0x83, b'd', b'o', b'g']),
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ETestPair("Marek", vec![0x85, b'M', b'a', b'r', b'e', b'k']),
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ETestPair("", vec![0x80]),
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ETestPair("Lorem ipsum dolor sit amet, consectetur adipisicing elit",
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vec![0xb8, 0x38, b'L', b'o', b'r', b'e', b'm', b' ', b'i',
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b'p', b's', b'u', b'm', b' ', b'd', b'o', b'l', b'o', b'r',
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b' ', b's', b'i', b't', b' ', b'a', b'm', b'e', b't', b',',
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b' ', b'c', b'o', b'n', b's', b'e', b'c', b't', b'e', b't',
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b'u', b'r', b' ', b'a', b'd', b'i', b'p', b'i', b's', b'i',
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b'c', b'i', b'n', b'g', b' ', b'e', b'l', b'i', b't'])
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];
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b'p', b's', b'u', b'm', b' ', b'd', b'o', b'l', b'o',
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b'r', b' ', b's', b'i', b't', b' ', b'a', b'm', b'e',
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b't', b',', b' ', b'c', b'o', b'n', b's', b'e', b'c',
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b't', b'e', b't', b'u', b'r', b' ', b'a', b'd', b'i',
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b'p', b'i', b's', b'i', b'c', b'i', b'n', b'g', b' ',
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b'e', b'l', b'i', b't'])];
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run_encode_tests(tests);
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}
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@ -695,17 +734,14 @@ mod tests {
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#[test]
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fn encode_vector_str() {
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let tests = vec![
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ETestPair(vec!["cat", "dog"], vec![0xc8, 0x83, b'c', b'a', b't', 0x83, b'd', b'o', b'g'])
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];
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let tests = vec![ETestPair(vec!["cat", "dog"],
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vec![0xc8, 0x83, b'c', b'a', b't', 0x83, b'd', b'o', b'g'])];
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run_encode_tests(tests);
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}
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#[test]
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fn encode_vector_of_vectors_str() {
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let tests = vec![
|
||||
ETestPair(vec![vec!["cat"]], vec![0xc5, 0xc4, 0x83, b'c', b'a', b't'])
|
||||
];
|
||||
let tests = vec![ETestPair(vec![vec!["cat"]], vec![0xc5, 0xc4, 0x83, b'c', b'a', b't'])];
|
||||
run_encode_tests(tests);
|
||||
}
|
||||
|
||||
@ -714,7 +750,8 @@ mod tests {
|
||||
let mut stream = RlpStream::new_list(2);
|
||||
stream.append(&"cat").append(&"dog");
|
||||
let out = stream.out().unwrap();
|
||||
assert_eq!(out, vec![0xc8, 0x83, b'c', b'a', b't', 0x83, b'd', b'o', b'g']);
|
||||
assert_eq!(out,
|
||||
vec![0xc8, 0x83, b'c', b'a', b't', 0x83, b'd', b'o', b'g']);
|
||||
}
|
||||
|
||||
#[test]
|
||||
@ -729,7 +766,9 @@ mod tests {
|
||||
|
||||
struct DTestPair<T>(T, Vec<u8>) where T: rlp::Decodable + fmt::Debug + cmp::Eq;
|
||||
|
||||
fn run_decode_tests<T>(tests: Vec<DTestPair<T>>) where T: rlp::Decodable + fmt::Debug + cmp::Eq {
|
||||
fn run_decode_tests<T>(tests: Vec<DTestPair<T>>)
|
||||
where T: rlp::Decodable + fmt::Debug + cmp::Eq
|
||||
{
|
||||
for t in &tests {
|
||||
let res: T = rlp::decode(&t.1).unwrap();
|
||||
assert_eq!(res, t.0);
|
||||
@ -782,34 +821,36 @@ mod tests {
|
||||
|
||||
#[test]
|
||||
fn decode_u256() {
|
||||
let tests = vec![
|
||||
DTestPair(U256::from(0u64), vec![0x80u8]),
|
||||
let tests = vec![DTestPair(U256::from(0u64), vec![0x80u8]),
|
||||
DTestPair(U256::from(0x1000000u64), vec![0x84, 0x01, 0x00, 0x00, 0x00]),
|
||||
DTestPair(U256::from(0xffffffffu64), vec![0x84, 0xff, 0xff, 0xff, 0xff]),
|
||||
DTestPair(U256::from_str("8090a0b0c0d0e0f00910203040506077000000000000000100000000000012f0").unwrap(),
|
||||
DTestPair(U256::from(0xffffffffu64),
|
||||
vec![0x84, 0xff, 0xff, 0xff, 0xff]),
|
||||
DTestPair(U256::from_str("8090a0b0c0d0e0f00910203040506077000000000000\
|
||||
000100000000000012f0")
|
||||
.unwrap(),
|
||||
vec![0xa0, 0x80, 0x90, 0xa0, 0xb0, 0xc0, 0xd0, 0xe0, 0xf0,
|
||||
0x09, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x77,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x12, 0xf0])
|
||||
];
|
||||
0x09, 0x10, 0x20, 0x30, 0x40, 0x50, 0x60, 0x77, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x00, 0x00,
|
||||
0x00, 0x00, 0x00, 0x00, 0x12, 0xf0])];
|
||||
run_decode_tests(tests);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn decode_str() {
|
||||
let tests = vec![
|
||||
DTestPair("cat".to_string(), vec![0x83, b'c', b'a', b't']),
|
||||
let tests = vec![DTestPair("cat".to_string(), vec![0x83, b'c', b'a', b't']),
|
||||
DTestPair("dog".to_string(), vec![0x83, b'd', b'o', b'g']),
|
||||
DTestPair("Marek".to_string(), vec![0x85, b'M', b'a', b'r', b'e', b'k']),
|
||||
DTestPair("Marek".to_string(),
|
||||
vec![0x85, b'M', b'a', b'r', b'e', b'k']),
|
||||
DTestPair("".to_string(), vec![0x80]),
|
||||
DTestPair("Lorem ipsum dolor sit amet, consectetur adipisicing elit".to_string(),
|
||||
DTestPair("Lorem ipsum dolor sit amet, consectetur adipisicing elit"
|
||||
.to_string(),
|
||||
vec![0xb8, 0x38, b'L', b'o', b'r', b'e', b'm', b' ', b'i',
|
||||
b'p', b's', b'u', b'm', b' ', b'd', b'o', b'l', b'o', b'r',
|
||||
b' ', b's', b'i', b't', b' ', b'a', b'm', b'e', b't', b',',
|
||||
b' ', b'c', b'o', b'n', b's', b'e', b'c', b't', b'e', b't',
|
||||
b'u', b'r', b' ', b'a', b'd', b'i', b'p', b'i', b's', b'i',
|
||||
b'c', b'i', b'n', b'g', b' ', b'e', b'l', b'i', b't'])
|
||||
];
|
||||
b'p', b's', b'u', b'm', b' ', b'd', b'o', b'l', b'o',
|
||||
b'r', b' ', b's', b'i', b't', b' ', b'a', b'm', b'e',
|
||||
b't', b',', b' ', b'c', b'o', b'n', b's', b'e', b'c',
|
||||
b't', b'e', b't', b'u', b'r', b' ', b'a', b'd', b'i',
|
||||
b'p', b'i', b's', b'i', b'c', b'i', b'n', b'g', b' ',
|
||||
b'e', b'l', b'i', b't'])];
|
||||
run_decode_tests(tests);
|
||||
}
|
||||
|
||||
@ -836,18 +877,15 @@ mod tests {
|
||||
|
||||
#[test]
|
||||
fn decode_vector_str() {
|
||||
let tests = vec![
|
||||
DTestPair(vec!["cat".to_string(), "dog".to_string()], vec![0xc8, 0x83, b'c', b'a', b't', 0x83, b'd', b'o', b'g'])
|
||||
];
|
||||
let tests = vec![DTestPair(vec!["cat".to_string(), "dog".to_string()],
|
||||
vec![0xc8, 0x83, b'c', b'a', b't', 0x83, b'd', b'o', b'g'])];
|
||||
run_decode_tests(tests);
|
||||
}
|
||||
|
||||
#[test]
|
||||
fn decode_vector_of_vectors_str() {
|
||||
let tests = vec![
|
||||
DTestPair(vec![vec!["cat".to_string()]], vec![0xc5, 0xc4, 0x83, b'c', b'a', b't'])
|
||||
];
|
||||
let tests = vec![DTestPair(vec![vec!["cat".to_string()]],
|
||||
vec![0xc5, 0xc4, 0x83, b'c', b'a', b't'])];
|
||||
run_decode_tests(tests);
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user