mirror of https://github.com/dswd/zvault
105 lines
2.7 KiB
Rust
105 lines
2.7 KiB
Rust
use ::prelude::*;
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use std::collections::HashMap;
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use std::path::Path;
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use std::io::{self, BufReader, Read, Write, BufWriter};
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use std::fs::File;
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static HEADER_STRING: [u8; 7] = *b"zbunmap";
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static HEADER_VERSION: u8 = 1;
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quick_error!{
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#[derive(Debug)]
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pub enum BundleMapError {
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Io(err: io::Error) {
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from()
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cause(err)
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description("Failed to read/write bundle map")
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}
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Decode(err: msgpack::DecodeError) {
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from()
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cause(err)
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description("Failed to decode bundle map")
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}
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Encode(err: msgpack::EncodeError) {
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from()
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cause(err)
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description("Failed to encode bundle map")
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}
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WrongHeader {
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description("Wrong header")
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}
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WrongVersion(version: u8) {
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description("Wrong version")
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display("Wrong version: {}", version)
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}
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}
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}
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pub struct BundleMap(HashMap<u32, BundleId>);
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impl BundleMap {
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pub fn create() -> Self {
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BundleMap(Default::default())
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}
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pub fn load<P: AsRef<Path>>(path: P) -> Result<Self, BundleMapError> {
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let mut file = BufReader::new(try!(File::open(path.as_ref())));
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let mut header = [0u8; 8];
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try!(file.read_exact(&mut header));
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if header[..HEADER_STRING.len()] != HEADER_STRING {
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return Err(BundleMapError::WrongHeader)
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}
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let version = header[HEADER_STRING.len()];
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if version != HEADER_VERSION {
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return Err(BundleMapError::WrongVersion(version))
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}
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Ok(BundleMap(try!(msgpack::decode_from_stream(&mut file))))
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}
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pub fn save<P: AsRef<Path>>(&self, path: P) -> Result<(), BundleMapError> {
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let mut file = BufWriter::new(try!(File::create(path)));
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try!(file.write_all(&HEADER_STRING));
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try!(file.write_all(&[HEADER_VERSION]));
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msgpack::encode_to_stream(&self.0, &mut file).map_err(BundleMapError::Encode)
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}
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#[inline]
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pub fn get(&self, id: u32) -> Option<BundleId> {
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self.0.get(&id).cloned()
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}
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#[inline]
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pub fn remove(&mut self, id: u32) -> Option<BundleId> {
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self.0.remove(&id)
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}
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#[inline]
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pub fn find(&self, bundle: &BundleId) -> Option<u32> {
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for (id, bundle_id) in &self.0 {
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if bundle == bundle_id {
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return Some(*id)
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}
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}
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None
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}
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#[inline]
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pub fn set(&mut self, id: u32, bundle: BundleId) {
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self.0.insert(id, bundle);
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}
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#[inline]
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pub fn bundles(&self) -> Vec<(u32, BundleId)> {
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self.0.iter().map(|(id, bundle)| (*id, bundle.clone())).collect()
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}
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#[inline]
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pub fn len(&self) -> usize {
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self.0.len()
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}
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}
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