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webmetro
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implement decode_uint

This commit is contained in:
Tangent 128 2017-06-29 02:38:08 -04:00
parent 8c88ff25d0
commit 51156d9fde
1 changed files with 31 additions and 0 deletions
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31
src/ebml.rs
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@ -93,6 +93,18 @@ pub fn decode_tag(bytes: &[u8]) -> Result<Option<(u64, Varint, usize)>, Error> {
}
}
pub fn decode_uint(bytes: &[u8]) -> Result<u64, Error> {
if bytes.len() < 1 || bytes.len() > 8 {
return Err(Error::CorruptPayload);
}
let mut value: u64 = 0;
for byte in bytes {
value = (value << 8) + (*byte as u64);
}
Ok(value)
}
#[derive(Debug, PartialEq)]
pub struct Ebml<S, T>(pub S, pub T);
@ -190,6 +202,25 @@ mod tests {
assert_eq!(decode_tag(&[0x85, 0x40, 52]), Ok(Some((5, Value(52), 3))));
}
#[test]
fn bad_uints() {
assert_eq!(decode_uint(&[]), Err(Error::CorruptPayload));
assert_eq!(decode_uint(&[0; 9]), Err(Error::CorruptPayload));
}
#[test]
fn parse_uints() {
assert_eq!(decode_uint(&[0]), Ok(0));
assert_eq!(decode_uint(&[0; 8]), Ok(0));
assert_eq!(decode_uint(&[1]), Ok(1));
assert_eq!(decode_uint(&[0,0,0,0,0,0,0,1]), Ok(1));
assert_eq!(decode_uint(&[38]), Ok(38));
assert_eq!(decode_uint(&[0,0,0,0,0,0,0,38]), Ok(38));
assert_eq!(decode_uint(&[0x7F,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF]), Ok(9223372036854775807));
assert_eq!(decode_uint(&[0x80,0,0,0,0,0,0,0]), Ok(9223372036854775808));
assert_eq!(decode_uint(&[0x80,0,0,0,0,0,0,1]), Ok(9223372036854775809));
}
struct Dummy;
#[derive(Debug, PartialEq)]