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use std::convert::TryFrom;
use std::io::BufRead;
use std::io::Cursor;
use byteorder::{LittleEndian, ReadBytesExt};
use crate::errors::{Error, Result};
use crate::mime_type::MimeType;
use crate::namespace::Namespace;
use crate::target::Target;
use crate::zim::Zim;
#[derive(Debug)]
pub struct DirectoryEntry {
pub mime_type: MimeType,
pub namespace: Namespace,
pub revision: Option<u32>,
pub url: String,
pub title: String,
pub target: Option<Target>,
}
impl DirectoryEntry {
pub fn new(zim: &Zim, s: &[u8]) -> Result<DirectoryEntry> {
let mut cur = Cursor::new(s);
let mime_id = cur.read_u16::<LittleEndian>()?;
let mime_type = zim.get_mimetype(mime_id).ok_or(Error::UnknownMimeType)?;
let _ = cur.read_u8()?;
let namespace = cur.read_u8()?;
let rev = cur.read_u32::<LittleEndian>().ok();
let target = if mime_type == MimeType::Redirect {
Some(Target::Redirect(cur.read_u32::<LittleEndian>()?))
} else if mime_type == MimeType::LinkTarget || mime_type == MimeType::DeletedEntry {
None
} else {
let cluster_number = cur.read_u32::<LittleEndian>()?;
let blob_number = cur.read_u32::<LittleEndian>()?;
Some(Target::Cluster(cluster_number, blob_number))
};
let url = {
let mut vec = Vec::new();
let size = cur.read_until(0, &mut vec)?;
vec.truncate(size - 1);
String::from_utf8(vec)?
};
let title = {
let mut vec = Vec::new();
let size = cur.read_until(0, &mut vec)?;
vec.truncate(size - 1);
String::from_utf8(vec)?
};
Ok(DirectoryEntry {
mime_type,
namespace: Namespace::try_from(namespace)?,
revision: rev,
url,
title,
target,
})
}
}