77 lines
2.3 KiB
Rust
77 lines
2.3 KiB
Rust
// Copyright 2013-2014 The Rust Project Developers. See the COPYRIGHT
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// file at the top-level directory of this distribution and at
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// http://rust-lang.org/COPYRIGHT.
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//
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// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
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// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
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// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
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// option. This file may not be copied, modified, or distributed
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// except according to those terms.
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//! A wrapper around LLVM's archive (.a) code
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use libc;
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use ArchiveRef;
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use std::ffi::CString;
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use std::slice;
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use std::path::Path;
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pub struct ArchiveRO {
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ptr: ArchiveRef,
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}
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impl ArchiveRO {
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/// Opens a static archive for read-only purposes. This is more optimized
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/// than the `open` method because it uses LLVM's internal `Archive` class
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/// rather than shelling out to `ar` for everything.
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///
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/// If this archive is used with a mutable method, then an error will be
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/// raised.
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pub fn open(dst: &Path) -> Option<ArchiveRO> {
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return unsafe {
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let s = path2cstr(dst);
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let ar = ::LLVMRustOpenArchive(s.as_ptr());
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if ar.is_null() {
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None
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} else {
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Some(ArchiveRO { ptr: ar })
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}
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};
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#[cfg(unix)]
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fn path2cstr(p: &Path) -> CString {
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use std::os::unix::prelude::*;
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use std::ffi::AsOsStr;
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CString::new(p.as_os_str().as_bytes()).unwrap()
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}
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#[cfg(windows)]
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fn path2cstr(p: &Path) -> CString {
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CString::new(p.to_str().unwrap()).unwrap()
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}
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}
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/// Reads a file in the archive
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pub fn read<'a>(&'a self, file: &str) -> Option<&'a [u8]> {
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unsafe {
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let mut size = 0 as libc::size_t;
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let file = CString::new(file).unwrap();
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let ptr = ::LLVMRustArchiveReadSection(self.ptr, file.as_ptr(),
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&mut size);
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if ptr.is_null() {
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None
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} else {
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Some(slice::from_raw_parts(ptr as *const u8, size as uint))
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}
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}
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}
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}
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impl Drop for ArchiveRO {
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fn drop(&mut self) {
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unsafe {
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::LLVMRustDestroyArchive(self.ptr);
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}
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}
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}
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