Import libz-sys 1.1.2

And add metadata files using the following command:
get_rust_pkg.py --add3prf -v libz-sys-1.1.2 -o libz-sys

Add README.android as requested in security review.

Test: none
Change-Id: I32b620d002738c0456acdda71bfa47ae6c29b95d

1 files changed, 215 insertions, 0 deletions

diff --git a/build.rs b/build.rs
new file mode 100644
index 0000000..c532c3c
--- /dev/null
+++ b/build.rs
@@ -0,0 +1,215 @@
+extern crate cc;
+extern crate pkg_config;
+#[cfg(target_env = "msvc")]
+extern crate vcpkg;
+
+use std::env;
+use std::fs;
+use std::path::PathBuf;
+use std::process::Command;
+
+fn main() {
+    println!("cargo:rerun-if-env-changed=LIBZ_SYS_STATIC");
+    println!("cargo:rerun-if-changed=build.rs");
+    let host = env::var("HOST").unwrap();
+    let target = env::var("TARGET").unwrap();
+
+    let host_and_target_contain = |s| host.contains(s) && target.contains(s);
+
+    let want_ng = cfg!(feature = "zlib-ng") && !cfg!(feature = "stock-zlib");
+
+    if want_ng && target != "wasm32-unknown-unknown" {
+        return build_zlib_ng(&target);
+    }
+
+    // Don't run pkg-config if we're linking statically (we'll build below) and
+    // also don't run pkg-config on macOS/FreeBSD/DragonFly. That'll end up printing
+    // `-L /usr/lib` which wreaks havoc with linking to an OpenSSL in /usr/local/lib
+    // (Homebrew, Ports, etc.)
+    let want_static =
+        cfg!(feature = "static") || env::var("LIBZ_SYS_STATIC").unwrap_or(String::new()) == "1";
+    if !want_static &&
+       !target.contains("msvc") && // pkg-config just never works here
+       !(host_and_target_contain("apple") ||
+         host_and_target_contain("freebsd") ||
+         host_and_target_contain("dragonfly"))
+    {
+        // Don't print system lib dirs to cargo since this interferes with other
+        // packages adding non-system search paths to link against libraries
+        // that are also found in a system-wide lib dir.
+        let zlib = pkg_config::Config::new()
+            .cargo_metadata(true)
+            .print_system_libs(false)
+            .probe("zlib");
+        if zlib.is_ok() {
+            return;
+        }
+    }
+
+    if target.contains("msvc") {
+        if try_vcpkg() {
+            return;
+        }
+    }
+
+    // All android compilers should come with libz by default, so let's just use
+    // the one already there.
+    if target.contains("android") {
+        println!("cargo:rustc-link-lib=z");
+        return;
+    }
+
+    let mut cfg = cc::Build::new();
+
+    // Situations where we build unconditionally.
+    //
+    // MSVC basically never has it preinstalled, MinGW picks up a bunch of weird
+    // paths we don't like, `want_static` may force us, cross compiling almost
+    // never has a prebuilt version, and musl is almost always static.
+    if target.contains("msvc")
+        || target.contains("pc-windows-gnu")
+        || want_static
+        || target != host
+        || target.contains("musl")
+    {
+        return build_zlib(&mut cfg, &target);
+    }
+
+    // If we've gotten this far we're probably a pretty standard platform.
+    // Almost all platforms here ship libz by default, but some don't have
+    // pkg-config files that we would find above.
+    //
+    // In any case test if zlib is actually installed and if so we link to it,
+    // otherwise continue below to build things.
+    if zlib_installed(&mut cfg) {
+        println!("cargo:rustc-link-lib=z");
+        return;
+    }
+
+    build_zlib(&mut cfg, &target)
+}
+
+fn build_zlib(cfg: &mut cc::Build, target: &str) {
+    let dst = PathBuf::from(env::var_os("OUT_DIR").unwrap());
+    let build = dst.join("build");
+
+    cfg.warnings(false).out_dir(&build).include("src/zlib");
+
+    cfg.file("src/zlib/adler32.c")
+        .file("src/zlib/compress.c")
+        .file("src/zlib/crc32.c")
+        .file("src/zlib/deflate.c")
+        .file("src/zlib/infback.c")
+        .file("src/zlib/inffast.c")
+        .file("src/zlib/inflate.c")
+        .file("src/zlib/inftrees.c")
+        .file("src/zlib/trees.c")
+        .file("src/zlib/uncompr.c")
+        .file("src/zlib/zutil.c");
+
+    if !cfg!(feature = "libc") || target == "wasm32-unknown-unknown" {
+        cfg.define("Z_SOLO", None);
+    } else {
+        cfg.file("src/zlib/gzclose.c")
+            .file("src/zlib/gzlib.c")
+            .file("src/zlib/gzread.c")
+            .file("src/zlib/gzwrite.c");
+    }
+
+    if !target.contains("windows") {
+        cfg.define("STDC", None);
+        cfg.define("_LARGEFILE64_SOURCE", None);
+        cfg.define("_POSIX_SOURCE", None);
+        cfg.flag("-fvisibility=hidden");
+    }
+    if target.contains("apple") {
+        cfg.define("_C99_SOURCE", None);
+    }
+    if target.contains("solaris") {
+        cfg.define("_XOPEN_SOURCE", "700");
+    }
+
+    cfg.compile("z");
+
+    fs::create_dir_all(dst.join("lib/pkgconfig")).unwrap();
+    fs::create_dir_all(dst.join("include")).unwrap();
+    fs::copy("src/zlib/zlib.h", dst.join("include/zlib.h")).unwrap();
+    fs::copy("src/zlib/zconf.h", dst.join("include/zconf.h")).unwrap();
+
+    fs::write(
+        dst.join("lib/pkgconfig/zlib.pc"),
+        fs::read_to_string("src/zlib/zlib.pc.in")
+            .unwrap()
+            .replace("@prefix@", dst.to_str().unwrap()),
+    )
+    .unwrap();
+
+    println!("cargo:root={}", dst.to_str().unwrap());
+    println!("cargo:include={}/include", dst.to_str().unwrap());
+}
+
+#[cfg(not(feature = "zlib-ng"))]
+fn build_zlib_ng(_target: &str) {}
+
+#[cfg(feature = "zlib-ng")]
+fn build_zlib_ng(target: &str) {
+    let install_dir = cmake::Config::new("src/zlib-ng")
+        .define("BUILD_SHARED_LIBS", "OFF")
+        .define("ZLIB_COMPAT", "ON")
+        .define("WITH_GZFILEOP", "ON")
+        .build();
+    let includedir = install_dir.join("include");
+    let libdir = install_dir.join("lib");
+    println!(
+        "cargo:rustc-link-search=native={}",
+        libdir.to_str().unwrap()
+    );
+    let libname = if target.contains("windows") {
+        if target.contains("msvc") && env::var("OPT_LEVEL").unwrap() == "0" {
+            "zlibd"
+        } else {
+            "zlib"
+        }
+    } else {
+        "z"
+    };
+    println!("cargo:rustc-link-lib=static={}", libname);
+    println!("cargo:root={}", install_dir.to_str().unwrap());
+    println!("cargo:include={}", includedir.to_str().unwrap());
+}
+
+#[cfg(not(target_env = "msvc"))]
+fn try_vcpkg() -> bool {
+    false
+}
+
+#[cfg(target_env = "msvc")]
+fn try_vcpkg() -> bool {
+    // see if there is a vcpkg tree with zlib installed
+    match vcpkg::Config::new()
+        .emit_includes(true)
+        .lib_names("zlib", "zlib1")
+        .probe("zlib")
+    {
+        Ok(_) => true,
+        Err(e) => {
+            println!("note, vcpkg did not find zlib: {}", e);
+            false
+        }
+    }
+}
+
+fn zlib_installed(cfg: &mut cc::Build) -> bool {
+    let compiler = cfg.get_compiler();
+    let mut cmd = Command::new(compiler.path());
+    cmd.arg("src/smoke.c").arg("-o").arg("/dev/null").arg("-lz");
+
+    println!("running {:?}", cmd);
+    if let Ok(status) = cmd.status() {
+        if status.success() {
+            return true;
+        }
+    }
+
+    false
+}