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extern crate gcc;
use std::env;
use std::path::PathBuf;
use std::fs::File;
use std::io::Write as IoWrite;
use std::fmt::Write;
fn main() {
let options_shim_file = generate_options_shim();
let mut config = gcc::Config::new();
if let Some(paths) = env::var_os("DEP_OPENSSL_INCLUDE") {
for path in env::split_paths(&paths) {
config.include(PathBuf::from(path));
}
}
config.file("src/openssl_shim.c")
.file(options_shim_file)
.compile("libopenssl_shim.a");
}
macro_rules! import_options {
( $( $name:ident $val:expr )* ) => {
&[ $( (stringify!($name),$val), )* ]
};
}
fn generate_options_shim() -> PathBuf {
let options: &[(&'static str,u64)]=include!("src/ssl_options.rs");
let mut shim = String::new();
writeln!(shim,"#include <stdint.h>").unwrap();
writeln!(shim,"#include <openssl/ssl.h>").unwrap();
for &(name,value) in options {
writeln!(shim,"#define RUST_{} UINT64_C({})",name,value).unwrap();
writeln!(shim,"#ifndef {}",name).unwrap();
writeln!(shim,"# define {} 0",name).unwrap();
writeln!(shim,"#endif").unwrap();
}
writeln!(shim,"#define COPY_MASK ( \\").unwrap();
let mut it=options.iter().peekable();
while let Some(&(name,_))=it.next() {
let eol=match it.peek() {
Some(_) => " | \\",
None => " )"
};
writeln!(shim," ((RUST_{0}==(uint64_t)(uint32_t){0})?RUST_{0}:UINT64_C(0)){1}",name,eol).unwrap();
}
writeln!(shim,"long rust_openssl_ssl_ctx_options_rust_to_c(uint64_t rustval) {{").unwrap();
writeln!(shim," long cval=rustval©_MASK;").unwrap();
for &(name,_) in options {
writeln!(shim," if (rustval&RUST_{0}) cval|={0};",name).unwrap();
}
writeln!(shim," return cval;").unwrap();
writeln!(shim,"}}").unwrap();
writeln!(shim,"uint64_t rust_openssl_ssl_ctx_options_c_to_rust(long cval) {{").unwrap();
writeln!(shim," uint64_t rustval=cval©_MASK;").unwrap();
for &(name,_) in options {
writeln!(shim," if (cval&{0}) rustval|=RUST_{0};",name).unwrap();
}
writeln!(shim," return rustval;").unwrap();
writeln!(shim,"}}").unwrap();
let out_dir = env::var("OUT_DIR").unwrap();
let dest_file = PathBuf::from(&out_dir).join("ssl_ctx_options_shim.c");
let mut f = File::create(&dest_file).unwrap();
f.write_all(shim.as_bytes()).unwrap();
dest_file
}
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