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#![no_std]
use core::mem;
use plain;
pub use self::big_endian::Be32;
mod big_endian;
pub use self::file::File;
mod file;
pub use self::fmap::Fmap;
mod fmap;
pub use self::header::Header;
mod header;
pub struct Rom<'a>(pub &'a [u8]);
impl<'a> Rom<'a> {
pub fn new(data: &'a [u8]) -> Self {
Self(data)
}
pub fn fmap(&self) -> Option<&Fmap> {
let mut offset = 0;
while offset + mem::size_of::<Fmap>() < self.0.len() {
let fmap: &Fmap = plain::from_bytes(&self.0[offset..]).ok()?;
if &fmap.signature == b"__FMAP__" {
return Some(fmap);
}
offset += 8;
}
None
}
pub fn header_offset(&self) -> Option<usize> {
if self.0.len() < 4 {
return None;
}
Some({
let i = self.0.len() - 4;
(self.0[i] as usize) |
(self.0[i + 1] as usize) << 8 |
(self.0[i + 2] as usize) << 16
})
}
pub fn header(&self) -> Option<&Header> {
let offset = self.header_offset()?;
if offset >= self.0.len() {
return None;
}
let header: &Header = plain::from_bytes(&self.0[offset..]).ok()?;
if &header.magic == b"ORBC" {
Some(header)
} else {
None
}
}
pub fn file(&self, offset: usize) -> Option<&File> {
if offset >= self.0.len() {
return None;
}
let file: &File = plain::from_bytes(&self.0[offset..]).ok()?;
if &file.magic == b"LARCHIVE" {
Some(file)
} else {
None
}
}
}