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payload_info moved to decoder

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This commit is contained in:
debris 2015-12-02 14:05:17 +01:00
parent 21f87cfb0f
commit 35ae32a8a5
1 changed files with 36 additions and 35 deletions
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71
src/rlp.rs
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@ -355,7 +355,7 @@ impl<'a, 'view> UntrustedRlp<'a> where 'a: 'view {
}
pub fn data(&'view self) -> &'a [u8] {
let ii = Self::item_info(self.bytes).unwrap();
let ii = BasicDecoder::payload_info(self.bytes).unwrap();
&self.bytes[ii.header_len..(ii.header_len + ii.value_len)]
}
@ -396,7 +396,7 @@ impl<'a, 'view> UntrustedRlp<'a> where 'a: 'view {
/// ```
pub fn size(&self) -> usize {
match self.is_data() {
true => Self::item_info(self.bytes).unwrap().value_len,
true => BasicDecoder::payload_info(self.bytes).unwrap().value_len,
false => 0
}
}
@ -439,7 +439,7 @@ impl<'a, 'view> UntrustedRlp<'a> where 'a: 'view {
self.cache.set(OffsetCache::new(index, self.bytes.len() - bytes.len()));
// construct new rlp
let found = try!(UntrustedRlp::item_info(bytes));
let found = try!(BasicDecoder::payload_info(bytes));
Ok(UntrustedRlp::new(&bytes[0..found.header_len + found.value_len]))
}
@ -554,7 +554,7 @@ impl<'a, 'view> UntrustedRlp<'a> where 'a: 'view {
/// consumes first found prefix
fn consume_list_prefix(&self) -> Result<&'a [u8], DecoderError> {
let item = try!(UntrustedRlp::item_info(self.bytes));
let item = try!(BasicDecoder::payload_info(self.bytes));
let bytes = try!(UntrustedRlp::consume(self.bytes, item.header_len));
Ok(bytes)
}
@ -563,42 +563,12 @@ impl<'a, 'view> UntrustedRlp<'a> where 'a: 'view {
fn consume_items(bytes: &'a [u8], items: usize) -> Result<&'a [u8], DecoderError> {
let mut result = bytes;
for _ in 0..items {
let i = try!(UntrustedRlp::item_info(result));
let i = try!(BasicDecoder::payload_info(result));
result = try!(UntrustedRlp::consume(result, (i.header_len + i.value_len)));
}
Ok(result)
}
/// return first item info
///
/// TODO: move this to decoder (?)
fn item_info(bytes: &[u8]) -> Result<PayloadInfo, DecoderError> {
let item = match bytes.first().map(|&x| x) {
None => return Err(DecoderError::RlpIsTooShort),
Some(0...0x7f) => PayloadInfo::new(0, 1),
Some(l @ 0x80...0xb7) => PayloadInfo::new(1, l as usize - 0x80),
Some(l @ 0xb8...0xbf) => {
let len_of_len = l as usize - 0xb7;
let header_len = 1 + len_of_len;
let value_len = try!(usize::from_bytes(&bytes[1..header_len]));
PayloadInfo::new(header_len, value_len)
}
Some(l @ 0xc0...0xf7) => PayloadInfo::new(1, l as usize - 0xc0),
Some(l @ 0xf8...0xff) => {
let len_of_len = l as usize - 0xf7;
let header_len = 1 + len_of_len;
let value_len = try!(usize::from_bytes(&bytes[1..header_len]));
PayloadInfo::new(header_len, value_len)
}
// we cant reach this place, but rust requires _ to be implemented
_ => return Err(DecoderError::BadRlp),
};
match item.header_len + item.value_len <= bytes.len() {
true => Ok(item),
false => Err(DecoderError::RlpIsTooShort),
}
}
/// consumes slice prefix of length `len`
fn consume(bytes: &'a [u8], len: usize) -> Result<&'a [u8], DecoderError> {
@ -730,6 +700,37 @@ pub trait Decoder {
struct BasicDecoder;
impl BasicDecoder {
/// Return first item info
fn payload_info(bytes: &[u8]) -> Result<PayloadInfo, DecoderError> {
let item = match bytes.first().map(|&x| x) {
None => return Err(DecoderError::RlpIsTooShort),
Some(0...0x7f) => PayloadInfo::new(0, 1),
Some(l @ 0x80...0xb7) => PayloadInfo::new(1, l as usize - 0x80),
Some(l @ 0xb8...0xbf) => {
let len_of_len = l as usize - 0xb7;
let header_len = 1 + len_of_len;
let value_len = try!(usize::from_bytes(&bytes[1..header_len]));
PayloadInfo::new(header_len, value_len)
}
Some(l @ 0xc0...0xf7) => PayloadInfo::new(1, l as usize - 0xc0),
Some(l @ 0xf8...0xff) => {
let len_of_len = l as usize - 0xf7;
let header_len = 1 + len_of_len;
let value_len = try!(usize::from_bytes(&bytes[1..header_len]));
PayloadInfo::new(header_len, value_len)
}
// we cant reach this place, but rust requires _ to be implemented
_ => return Err(DecoderError::BadRlp),
};
match item.header_len + item.value_len <= bytes.len() {
true => Ok(item),
false => Err(DecoderError::RlpIsTooShort),
}
}
}
impl Decoder for BasicDecoder {
fn read_value<T, F>(bytes: &[u8], f: F) -> Result<T, DecoderError> where F: FnOnce(&[u8]) -> Result<T, DecoderError> {
match bytes.first().map(|&x| x) {