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use std::io::Cursor;
use byteorder::{LittleEndian, ReadBytesExt};
use failure::{ensure, Error};
use crate::model::owned::ResourcesBuf;
#[allow(dead_code)]
#[derive(Debug)]
pub struct ResourceWrapper<'a> {
raw_data: &'a [u8],
}
impl<'a> ResourceWrapper<'a> {
pub fn new(raw_data: &'a [u8]) -> Self {
Self { raw_data }
}
pub fn get_resources(&self) -> Result<Vec<u32>, Error> {
let mut cursor = Cursor::new(self.raw_data);
cursor.set_position(4);
let count = cursor.read_u32::<LittleEndian>()?;
let amount_of_resources = (count / 4) - 2;
ensure!(
count <= self.raw_data.len() as u32,
"there is not enough data on the buffer ({}) to read the reported resources count ({})",
self.raw_data.len(),
count
);
let mut resources = Vec::with_capacity(amount_of_resources as usize);
for _ in 0..amount_of_resources {
resources.push(cursor.read_u32::<LittleEndian>()?);
}
Ok(resources)
}
pub fn to_buffer(&self) -> Result<ResourcesBuf, Error> {
let mut owned = ResourcesBuf::default();
for r in &self.get_resources()? {
owned.push_resource(*r);
}
Ok(owned)
}
}
#[cfg(test)]
mod tests {
use super::ResourceWrapper;
use crate::model::owned::{OwnedBuf, ResourcesBuf};
#[test]
fn it_can_not_decode_a_buffer_with_an_invalid_size() {
let mut resources = ResourcesBuf::default();
resources.push_resource(111);
resources.push_resource(222);
let mut out = resources.to_vec().unwrap();
out[4] = 255;
let wrapper = ResourceWrapper::new(&out);
let result = wrapper.get_resources();
assert!(result.is_err());
assert_eq!(
"there is not enough data on the buffer (16) to read the reported resources count \
(255)",
result.err().unwrap().to_string()
);
}
}