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// Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT
// file at the top-level directory of this distribution and at
// http://rust-lang.org/COPYRIGHT.
//
// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
// option. This file may not be copied, modified, or distributed
// except according to those terms.
//! A wrapper around LLVM's archive (.a) code
use libc;
use ArchiveRef;
use std::ffi::CString;
use std::mem;
use std::raw;
pub struct ArchiveRO {
ptr: ArchiveRef,
}
impl ArchiveRO {
/// Opens a static archive for read-only purposes. This is more optimized
/// than the `open` method because it uses LLVM's internal `Archive` class
/// rather than shelling out to `ar` for everything.
///
/// If this archive is used with a mutable method, then an error will be
/// raised.
pub fn open(dst: &Path) -> Option<ArchiveRO> {
unsafe {
let s = CString::new(dst.as_vec()).unwrap();
let ar = ::LLVMRustOpenArchive(s.as_ptr());
if ar.is_null() {
None
} else {
Some(ArchiveRO { ptr: ar })
}
}
}
/// Reads a file in the archive
pub fn read<'a>(&'a self, file: &str) -> Option<&'a [u8]> {
unsafe {
let mut size = 0 as libc::size_t;
let file = CString::new(file).unwrap();
let ptr = ::LLVMRustArchiveReadSection(self.ptr, file.as_ptr(),
&mut size);
if ptr.is_null() {
None
} else {
Some(mem::transmute(raw::Slice {
data: ptr,
len: size as uint,
}))
}
}
}
}
impl Drop for ArchiveRO {
fn drop(&mut self) {
unsafe {
::LLVMRustDestroyArchive(self.ptr);
}
}
}
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