windows-metadata 0.60.0

Low-level metadata library for ECMA-335
Documentation 
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use super::*;

pub struct Blobs {
    map: HashMap<Vec<u8>, id::BlobId>,
    stream: Vec<u8>,
}

impl Default for Blobs {
    fn default() -> Self {
        Self {
            map: Default::default(),
            stream: vec![0], // the empty blob
        }
    }
}

impl Blobs {
    pub fn insert(&mut self, value: &[u8]) -> id::BlobId {
        if value.is_empty() {
            return id::BlobId(0);
        }

        if let Some(pos) = self.map.get(value) {
            return *pos;
        }

        let pos = id::BlobId(self.stream.len().try_into().unwrap());
        self.map.insert(value.to_vec(), pos);
        let len = value.len();

        match len {
            0..=0x7F => self.stream.push(len as u8),
            0x80..=0x3FFF => {
                self.stream.push((0x80 | (len >> 8)) as u8);
                self.stream.push((0xFF & len) as u8);
            }
            _ => {
                self.stream.push((0xC0 | (len >> 24)) as u8);
                self.stream.push((0xFF & (len >> 16)) as u8);
                self.stream.push((0xFF & (len >> 8)) as u8);
                self.stream.push((0xFF & len) as u8);
            }
        }

        self.stream.extend_from_slice(value);
        pos
    }

    pub fn into_stream(self) -> Vec<u8> {
        self.stream.into_stream()
    }
}