Adding upstream version 0.70.1+ds1.upstream/0.70.1+ds1upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

13 files changed, 1211 insertions, 0 deletions

diff --git a/vendor/libz-sys/.cargo-checksum.json b/vendor/libz-sys/.cargo-checksum.json
new file mode 100644
index 0000000..0cfc099
--- /dev/null
+++ b/vendor/libz-sys/.cargo-checksum.json
@@ -0,0 +1 @@
+{"files":{},"package":"d97137b25e321a73eef1418d1d5d2eda4d77e12813f8e6dead84bc52c5870a7b"}
\ No newline at end of file
diff --git a/vendor/libz-sys/Cargo.toml b/vendor/libz-sys/Cargo.toml
new file mode 100644
index 0000000..ed22f1c
--- /dev/null
+++ b/vendor/libz-sys/Cargo.toml
@@ -0,0 +1,59 @@
+# THIS FILE IS AUTOMATICALLY GENERATED BY CARGO
+#
+# When uploading crates to the registry Cargo will automatically
+# "normalize" Cargo.toml files for maximal compatibility
+# with all versions of Cargo and also rewrite `path` dependencies
+# to registry (e.g., crates.io) dependencies.
+#
+# If you are reading this file be aware that the original Cargo.toml
+# will likely look very different (and much more reasonable).
+# See Cargo.toml.orig for the original contents.
+
+[package]
+edition = "2018"
+name = "libz-sys"
+version = "1.1.12"
+authors = [
+    "Alex Crichton <alex@alexcrichton.com>",
+    "Josh Triplett <josh@joshtriplett.org>",
+    "Sebastian Thiel <sebastian.thiel@icloud.com>",
+]
+links = "z"
+exclude = [
+    "/.github",
+    "/.gitmodules",
+    "/Cargo-zng.toml",
+    "/cargo-zng",
+    "/ci",
+    "/systest",
+]
+description = "Low-level bindings to the system libz library (also known as zlib)."
+readme = "README.md"
+keywords = [
+    "zlib",
+    "zlib-ng",
+]
+categories = [
+    "compression",
+    "external-ffi-bindings",
+]
+license = "MIT OR Apache-2.0"
+repository = "https://github.com/rust-lang/libz-sys"
+
+[dependencies.libc]
+version = "0.2.43"
+optional = true
+
+[build-dependencies.pkg-config]
+version = "0.3.9"
+
+[build-dependencies.vcpkg]
+version = "0.2"
+
+[features]
+asm = []
+default = [
+    "libc",
+    "stock-zlib",
+]
+stock-zlib = []
diff --git a/vendor/libz-sys/LICENSE-APACHE b/vendor/libz-sys/LICENSE-APACHE
new file mode 100644
index 0000000..16fe87b
--- /dev/null
+++ b/vendor/libz-sys/LICENSE-APACHE
@@ -0,0 +1,201 @@
+                              Apache License
+                        Version 2.0, January 2004
+                     http://www.apache.org/licenses/
+
+TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION
+
+1. Definitions.
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+   "License" shall mean the terms and conditions for use, reproduction,
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+5. Submission of Contributions. Unless You explicitly state otherwise,
+   any Contribution intentionally submitted for inclusion in the Work
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+6. Trademarks. This License does not grant permission to use the trade
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+   agreed to in writing, Licensor provides the Work (and each
+   Contributor provides its Contributions) on an "AS IS" BASIS,
+   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
+   implied, including, without limitation, any warranties or conditions
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+8. Limitation of Liability. In no event and under no legal theory,
+   whether in tort (including negligence), contract, or otherwise,
+   unless required by applicable law (such as deliberate and grossly
+   negligent acts) or agreed to in writing, shall any Contributor be
+   liable to You for damages, including any direct, indirect, special,
+   incidental, or consequential damages of any character arising as a
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+   boilerplate notice, with the fields enclosed by brackets "[]"
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+   file or class name and description of purpose be included on the
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+Copyright [yyyy] [name of copyright owner]
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+	http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
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diff --git a/vendor/libz-sys/LICENSE-MIT b/vendor/libz-sys/LICENSE-MIT
new file mode 100644
index 0000000..960ff42
--- /dev/null
+++ b/vendor/libz-sys/LICENSE-MIT
@@ -0,0 +1,26 @@
+Copyright (c) 2014 Alex Crichton
+Copyright (c) 2020 Josh Triplett
+
+Permission is hereby granted, free of charge, to any
+person obtaining a copy of this software and associated
+documentation files (the "Software"), to deal in the
+Software without restriction, including without
+limitation the rights to use, copy, modify, merge,
+publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software
+is furnished to do so, subject to the following
+conditions:
+
+The above copyright notice and this permission notice
+shall be included in all copies or substantial portions
+of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF
+ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED
+TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT
+SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
+CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
+OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR
+IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
+DEALINGS IN THE SOFTWARE.
diff --git a/vendor/libz-sys/README-zng.md b/vendor/libz-sys/README-zng.md
new file mode 100644
index 0000000..4ac40e0
--- /dev/null
+++ b/vendor/libz-sys/README-zng.md
@@ -0,0 +1,57 @@
+# libz-ng-sys
+
+A library for linking zlib-ng (`libz-ng`) to Rust programs natively, rather
+than in zlib-compat mode.
+
+zlib-ng is a high-performance implementation of zlib. zlib-ng supports building
+in two modes: zlib-compat mode, in whih it provides the same API as zlib and
+generally works as a drop-in replacement, and native mode, in which it provides
+its own API. The native API is almost identical to the zlib-compat API, except
+that some types use more correct sizes (rather than the sizes required for zlib
+compatibility), and the functions all have a `zng_` prefix. The latter allows
+zlib and zlib-ng to coexist in the same program.
+
+This crate provides bindings to the native zlib-ng API. However, for simplicity
+of porting, this crate exports the same API as libz-sys (without the `zng_`
+prefixes), making it easier to write Rust software compatible with both
+libz-sys and libz-ng-sys.
+
+# High-level API
+
+This crate provides bindings to the raw low-level C API. For a higher-level
+safe API to work with DEFLATE, zlib, or gzip streams, see
+[`flate2`](https://docs.rs/flate2). `flate2` supports many different
+implementations.
+
+# Development
+
+This crate is built from [the same sources as
+`libz-sys`](https://github.com/rust-lang/libz-sys). From within those sources,
+`Cargo.toml` is the manifest for `libz-sys`, and `Cargo-zng.toml` is the
+manifest for `libz-ng-sys`. The script `./cargo-zng` invokes Cargo on a
+temporary copy of the sources with `Cargo-zng.toml` replacing `Cargo.toml`; for
+instance, use `./cargo-zng publish` to publish `libz-ng-sys`.
+
+# Minimum Supported Rust Version (MSRV) Policy
+
+This crate uses the same MSRV policy as the
+[`flate2`](https://crates.io/crates/flate2) crate: This crate supports the
+current and previous stable versions of Rust. Older versions of Rust may work,
+but we don't guarantee these will continue to work.
+
+# License
+
+This project is licensed under either of
+
+ * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+   http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+   http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in this crate by you, as defined in the Apache-2.0 license, shall
+be dual licensed as above, without any additional terms or conditions.
diff --git a/vendor/libz-sys/README.md b/vendor/libz-sys/README.md
new file mode 100644
index 0000000..26088b1
--- /dev/null
+++ b/vendor/libz-sys/README.md
@@ -0,0 +1,74 @@
+# libz-sys
+
+A common library for linking `libz` to rust programs (also known as zlib).
+
+[Documentation](https://docs.rs/libz-sys)
+
+This also serves as the source for the `libz-ng-sys` crate, which builds
+zlib-ng natively (not in zlib-compat mode). See
+[`README-zng.md`](README-zng.md) for details.
+
+# High-level API
+
+This crate provides bindings to the raw low-level C API. For a higher-level
+safe API to work with DEFLATE, zlib, or gzip streams, see
+[`flate2`](https://docs.rs/flate2). `flate2` also supports alternative
+implementations, including slower but pure Rust implementations.
+
+# zlib-ng
+
+This crate supports building either the high-performance zlib-ng (in
+zlib-compat mode), or the widely available stock zlib.
+
+By default, `libz-sys` uses stock zlib, primarily because doing so allows the
+use of a shared system zlib library if available.
+
+Any application or library designed for zlib should work with zlib-ng in
+zlib-compat mode, as long as it doesn't make assumptions about the exact size
+or output of the deflated data (e.g. "compressing this data produces exactly
+this many bytes"), and as long as you don't also dynamically pull in a copy of
+stock zlib (which will produce conflicting symbols). Nonetheless, for maximum
+compatibility, every library crate in a build must opt into allowing zlib-ng;
+if any library crate in your dependency graph wants stock zlib, `libz-sys` will
+use stock zlib.
+
+Library crates depending on `libz-sys` should use:
+```
+libz-sys = { version = "1.1.0", default-features = false, features = ["libc"] }
+```
+(Omit the `libc` feature if you don't require the corresponding functions.)
+
+This allows higher-level crates depending on your library to opt into zlib-ng
+if desired.
+
+Building zlib-ng requires `cmake`.
+
+Crates that don't require compatibility with the zlib C API, and use zlib
+exclusively from Rust or support the zlib-ng native C API (prefixed with
+`zng_`) can use [`libz-ng-sys`](https://crates.io/crates/libz-ng-sys) instead,
+which allows zlib and zlib-ng to coexist in the same program. See
+[README-zng.md](README-zng.md) for details.
+
+# Minimum Supported Rust Version (MSRV) Policy
+
+This crate uses the same MSRV policy as the
+[`flate2`](https://crates.io/crates/flate2) crate: This crate supports the
+current and previous stable versions of Rust. Older versions of Rust may work,
+but we don't guarantee these will continue to work.
+
+# License
+
+This project is licensed under either of
+
+ * Apache License, Version 2.0, ([LICENSE-APACHE](LICENSE-APACHE) or
+   http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license ([LICENSE-MIT](LICENSE-MIT) or
+   http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in `libz-sys` by you, as defined in the Apache-2.0 license, shall be
+dual licensed as above, without any additional terms or conditions.
diff --git a/vendor/libz-sys/build.rs b/vendor/libz-sys/build.rs
new file mode 100644
index 0000000..0f8732a
--- /dev/null
+++ b/vendor/libz-sys/build.rs
@@ -0,0 +1,187 @@
+use std::env;
+use std::fs;
+use std::path::PathBuf;
+
+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 = false; /*cfg!(feature = "zlib-ng") && !cfg!(feature = "stock-zlib");
+
+    if want_ng && target != "wasm32-unknown-unknown" {
+        return build_zlib_ng(&target, true);
+    }*/
+
+    // Don't run pkg-config if we're linking statically (we'll build below) and
+    // also don't run pkg-config on FreeBSD/DragonFly. That'll end up printing
+    // `-L /usr/lib` which wreaks havoc with linking to an OpenSSL in /usr/local/lib
+    // (Ports, etc.)
+    let want_static = false;
+        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("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");
+        match zlib {
+            Ok(_) => return,
+            Err(e) => {
+                println!("cargo-warning={}", e.to_string())
+            }
+        }
+    }
+
+    /*if target.contains("windows") {
+        if try_vcpkg() {
+            return;
+        }
+    }*/
+
+    // All android compilers should come with libz by default, so let's just use
+    // the one already there. Likewise, Haiku always ships with libz, so we can
+    // link to it even when cross-compiling.
+    if target.contains("android") || target.contains("haiku") {
+        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, and cross compiling almost
+    // never has a prebuilt version.
+    //
+    // Apple platforms have libz.1.dylib, and it's usually available even when
+    // cross compiling (via fat binary or in the target's Xcode SDK)
+    let cross_compiling = target != host;
+    let apple_to_apple = host.contains("-apple-") && target.contains("-apple-");
+    if target.contains("msvc")
+        || target.contains("pc-windows-gnu")
+        || want_static
+        || (cross_compiling && !apple_to_apple)
+    {
+        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 lib = dst.join("lib");
+
+    cfg.warnings(false).out_dir(&lib).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.starts_with("wasm32") {
+        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("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::create_dir_all(lib.join("pkgconfig")).unwrap();
+    fs::write(
+        lib.join("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:rustc-link-search=native={}", lib.to_str().unwrap());
+    println!("cargo:include={}/include", dst.to_str().unwrap());
+}
+
+#[cfg(not(feature = "zlib-ng"))]
+fn build_zlib_ng(_target: &str, _compat: bool) {}
+
+#[cfg(feature = "zlib-ng")]
+mod build_zng;
+#[cfg(feature = "zlib-ng")]
+use build_zng::build_zlib_ng;
+
+fn try_vcpkg() -> bool {
+    // see if there is a vcpkg tree with zlib installed
+    match vcpkg::Config::new()
+        .emit_includes(true)
+        .find_package("zlib")
+    {
+        Ok(_) => true,
+        Err(e) => {
+            println!("note, vcpkg did not find zlib: {}", e);
+            false
+        }
+    }
+}
+
+fn zlib_installed(cfg: &mut cc::Build) -> bool {
+    let mut cmd = cfg.get_compiler().to_command();
+    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
+}*/
diff --git a/vendor/libz-sys/build_zng.rs b/vendor/libz-sys/build_zng.rs
new file mode 100644
index 0000000..2557625
--- /dev/null
+++ b/vendor/libz-sys/build_zng.rs
@@ -0,0 +1,60 @@
+use std::env;
+
+pub fn build_zlib_ng(target: &str, compat: bool) {
+    let mut cmake = cmake::Config::new("src/zlib-ng");
+    cmake
+        .define("BUILD_SHARED_LIBS", "OFF")
+        .define("ZLIB_COMPAT", if compat { "ON" } else { "OFF" })
+        .define("ZLIB_ENABLE_TESTS", "OFF")
+        .define("WITH_GZFILEOP", "ON");
+    if target.contains("s390x") {
+        // Enable hardware compression on s390x.
+        cmake
+            .define("WITH_DFLTCC_DEFLATE", "1")
+            .define("WITH_DFLTCC_INFLATE", "1")
+            .cflag("-DDFLTCC_LEVEL_MASK=0x7e");
+    }
+    if target == "i686-pc-windows-msvc" {
+        cmake.define("CMAKE_GENERATOR_PLATFORM", "Win32");
+    }
+
+    let install_dir = cmake.build();
+
+    let includedir = install_dir.join("include");
+    let libdir = install_dir.join("lib");
+    let libdir64 = install_dir.join("lib64");
+    println!(
+        "cargo:rustc-link-search=native={}",
+        libdir.to_str().unwrap()
+    );
+    println!(
+        "cargo:rustc-link-search=native={}",
+        libdir64.to_str().unwrap()
+    );
+    let mut debug_suffix = "";
+    let libname = if target.contains("windows") && target.contains("msvc") {
+        if env::var("OPT_LEVEL").unwrap() == "0" {
+            debug_suffix = "d";
+        }
+        "zlibstatic"
+    } else {
+        "z"
+    };
+    println!(
+        "cargo:rustc-link-lib=static={}{}{}",
+        libname,
+        if compat { "" } else { "-ng" },
+        debug_suffix,
+    );
+    println!("cargo:root={}", install_dir.to_str().unwrap());
+    println!("cargo:include={}", includedir.to_str().unwrap());
+    if !compat {
+        println!("cargo:rustc-cfg=zng");
+    }
+}
+
+#[allow(dead_code)]
+fn main() {
+    let target = env::var("TARGET").unwrap();
+    build_zlib_ng(&target, false);
+}
diff --git a/vendor/libz-sys/debian/patches/disable-zlib-ng.patch b/vendor/libz-sys/debian/patches/disable-zlib-ng.patch
new file mode 100644
index 0000000..e14ea4f
--- /dev/null
+++ b/vendor/libz-sys/debian/patches/disable-zlib-ng.patch
@@ -0,0 +1,21 @@
+--- a/Cargo.toml
++++ b/Cargo.toml
+@@ -65,7 +65,3 @@
+ ]
+ static = []
+ stock-zlib = []
+-zlib-ng = [
+-    "libc",
+-    "cmake",
+-]
+--- a/build.rs
++++ b/build.rs
+@@ -10,7 +10,7 @@
+ 
+     let host_and_target_contain = |s| host.contains(s) && target.contains(s);
+ 
+-    let want_ng = cfg!(feature = "zlib-ng") && !cfg!(feature = "stock-zlib");
++    let want_ng = false; cfg!(feature = "zlib-ng") && !cfg!(feature = "stock-zlib");
+ 
+     if want_ng && target != "wasm32-unknown-unknown" {
+         return build_zlib_ng(&target, true);
diff --git a/vendor/libz-sys/debian/patches/remove-static.patch b/vendor/libz-sys/debian/patches/remove-static.patch
new file mode 100644
index 0000000..017eeb4
--- /dev/null
+++ b/vendor/libz-sys/debian/patches/remove-static.patch
@@ -0,0 +1,87 @@
+--- a/Cargo.toml
++++ b/Cargo.toml
+@@ -44,13 +44,6 @@
+ version = "0.2.43"
+ optional = true
+ 
+-[build-dependencies.cc]
+-version = "1.0.18"
+-
+-[build-dependencies.cmake]
+-version = "0.1.44"
+-optional = true
+-
+ [build-dependencies.pkg-config]
+ version = "0.3.9"
+ 
+@@ -63,5 +56,4 @@
+     "libc",
+     "stock-zlib",
+ ]
+-static = []
+ stock-zlib = []
+--- a/build.rs
++++ b/build.rs
+@@ -10,17 +10,17 @@
+ 
+     let host_and_target_contain = |s| host.contains(s) && target.contains(s);
+ 
+-    let want_ng = false; cfg!(feature = "zlib-ng") && !cfg!(feature = "stock-zlib");
++    let want_ng = false; /*cfg!(feature = "zlib-ng") && !cfg!(feature = "stock-zlib");
+ 
+     if want_ng && target != "wasm32-unknown-unknown" {
+         return build_zlib_ng(&target, true);
+-    }
++    }*/
+ 
+     // Don't run pkg-config if we're linking statically (we'll build below) and
+     // also don't run pkg-config on FreeBSD/DragonFly. That'll end up printing
+     // `-L /usr/lib` which wreaks havoc with linking to an OpenSSL in /usr/local/lib
+     // (Ports, etc.)
+-    let want_static =
++    let want_static = false;
+         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
+@@ -42,11 +42,11 @@
+         }
+     }
+ 
+-    if target.contains("windows") {
++    /*if target.contains("windows") {
+         if try_vcpkg() {
+             return;
+         }
+-    }
++    }*/
+ 
+     // All android compilers should come with libz by default, so let's just use
+     // the one already there. Likewise, Haiku always ships with libz, so we can
+@@ -56,7 +56,7 @@
+         return;
+     }
+ 
+-    let mut cfg = cc::Build::new();
++    /*let mut cfg = cc::Build::new();
+ 
+     // Situations where we build unconditionally.
+     //
+@@ -87,10 +87,10 @@
+         return;
+     }
+ 
+-    build_zlib(&mut cfg, &target)
++    build_zlib(&mut cfg, &target)*/
+ }
+ 
+-fn build_zlib(cfg: &mut cc::Build, target: &str) {
++/*fn build_zlib(cfg: &mut cc::Build, target: &str) {
+     let dst = PathBuf::from(env::var_os("OUT_DIR").unwrap());
+     let lib = dst.join("lib");
+ 
+@@ -184,4 +184,4 @@
+     }
+ 
+     false
+-}
++}*/
diff --git a/vendor/libz-sys/debian/patches/series b/vendor/libz-sys/debian/patches/series
new file mode 100644
index 0000000..29c75f0
--- /dev/null
+++ b/vendor/libz-sys/debian/patches/series
@@ -0,0 +1,2 @@
+disable-zlib-ng.patch
+remove-static.patch
diff --git a/vendor/libz-sys/src/lib.rs b/vendor/libz-sys/src/lib.rs
new file mode 100644
index 0000000..ae00583
--- /dev/null
+++ b/vendor/libz-sys/src/lib.rs
@@ -0,0 +1,431 @@
+#![allow(non_camel_case_types)]
+#![allow(non_snake_case)]
+
+use std::os::raw::{c_char, c_int, c_long, c_uchar, c_uint, c_ulong, c_void};
+
+// Macro for variances between zlib-ng in native mode and either zlib or zlib-ng in zlib compat
+// mode. Note in particular that zlib-ng in compat mode does *not* use the zng case.
+#[cfg(not(zng))]
+macro_rules! if_zng {
+    ($_zng:tt, $not_zng:tt) => {
+        $not_zng
+    };
+}
+
+#[cfg(zng)]
+macro_rules! if_zng {
+    ($zng:tt, $_not_zng:tt) => {
+        $zng
+    };
+}
+
+// zlib uses unsigned long for various sizes; zlib-ng uses size_t.
+type z_size = if_zng!(usize, c_ulong);
+
+// zlib stores Adler-32 and CRC-32 checksums in unsigned long; zlib-ng uses uint32_t.
+type z_checksum = if_zng!(u32, c_ulong);
+
+pub type alloc_func = unsafe extern "C" fn(voidpf, uInt, uInt) -> voidpf;
+pub type Bytef = u8;
+pub type free_func = unsafe extern "C" fn(voidpf, voidpf);
+#[cfg(any(zng, feature = "libc"))]
+pub type gzFile = *mut gzFile_s;
+pub type in_func = unsafe extern "C" fn(*mut c_void, *mut *const c_uchar) -> c_uint;
+pub type out_func = unsafe extern "C" fn(*mut c_void, *mut c_uchar, c_uint) -> c_int;
+pub type uInt = c_uint;
+pub type uLong = c_ulong;
+pub type uLongf = c_ulong;
+pub type voidp = *mut c_void;
+pub type voidpc = *const c_void;
+pub type voidpf = *mut c_void;
+
+#[cfg(any(zng, feature = "libc"))]
+pub enum gzFile_s {}
+pub enum internal_state {}
+
+#[cfg(all(
+    not(zng),
+    feature = "libc",
+    not(all(target_family = "wasm", target_os = "unknown"))
+))]
+pub type z_off_t = libc::off_t;
+
+#[cfg(all(
+    not(zng),
+    feature = "libc",
+    all(target_family = "wasm", target_os = "unknown")
+))]
+pub type z_off_t = c_long;
+
+#[cfg(all(zng, windows, not(target_env = "gnu")))]
+pub type z_off_t = i64;
+
+#[cfg(all(zng, not(all(windows, not(target_env = "gnu")))))]
+pub type z_off_t = libc::off_t;
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub struct gz_header {
+    pub text: c_int,
+    pub time: uLong,
+    pub xflags: c_int,
+    pub os: c_int,
+    pub extra: *mut Bytef,
+    pub extra_len: uInt,
+    pub extra_max: uInt,
+    pub name: *mut Bytef,
+    pub name_max: uInt,
+    pub comment: *mut Bytef,
+    pub comm_max: uInt,
+    pub hcrc: c_int,
+    pub done: c_int,
+}
+pub type gz_headerp = *mut gz_header;
+
+#[repr(C)]
+#[derive(Copy, Clone)]
+pub struct z_stream {
+    pub next_in: *mut Bytef,
+    pub avail_in: uInt,
+    pub total_in: z_size,
+    pub next_out: *mut Bytef,
+    pub avail_out: uInt,
+    pub total_out: z_size,
+    pub msg: *mut c_char,
+    pub state: *mut internal_state,
+    pub zalloc: alloc_func,
+    pub zfree: free_func,
+    pub opaque: voidpf,
+    pub data_type: c_int,
+    pub adler: z_checksum,
+    pub reserved: uLong,
+}
+pub type z_streamp = *mut z_stream;
+
+// Ideally, this should instead use a macro that parses the whole block of externs, and generates
+// the appropriate link_name attributes, without duplicating the function names. However, ctest2
+// can't parse that.
+#[cfg(not(zng))]
+macro_rules! zng_prefix {
+    ($name:expr) => {
+        stringify!($name)
+    };
+}
+
+#[cfg(zng)]
+macro_rules! zng_prefix {
+    ($name:expr) => {
+        concat!("zng_", stringify!($name))
+    };
+}
+
+extern "C" {
+    #[link_name = zng_prefix!(adler32)]
+    pub fn adler32(adler: z_checksum, buf: *const Bytef, len: uInt) -> z_checksum;
+    #[link_name = zng_prefix!(crc32)]
+    pub fn crc32(crc: z_checksum, buf: *const Bytef, len: uInt) -> z_checksum;
+    #[link_name = zng_prefix!(deflate)]
+    pub fn deflate(strm: z_streamp, flush: c_int) -> c_int;
+    #[link_name = zng_prefix!(deflateBound)]
+    pub fn deflateBound(strm: z_streamp, sourceLen: uLong) -> uLong;
+    #[link_name = zng_prefix!(deflateCopy)]
+    pub fn deflateCopy(dest: z_streamp, source: z_streamp) -> c_int;
+    #[link_name = zng_prefix!(deflateEnd)]
+    pub fn deflateEnd(strm: z_streamp) -> c_int;
+    #[link_name = zng_prefix!(deflateParams)]
+    pub fn deflateParams(strm: z_streamp, level: c_int, strategy: c_int) -> c_int;
+    #[link_name = zng_prefix!(deflatePrime)]
+    pub fn deflatePrime(strm: z_streamp, bits: c_int, value: c_int) -> c_int;
+    #[link_name = zng_prefix!(deflateReset)]
+    pub fn deflateReset(strm: z_streamp) -> c_int;
+    #[link_name = zng_prefix!(deflateSetDictionary)]
+    pub fn deflateSetDictionary(
+        strm: z_streamp,
+        dictionary: *const Bytef,
+        dictLength: uInt,
+    ) -> c_int;
+    #[link_name = zng_prefix!(deflateSetHeader)]
+    pub fn deflateSetHeader(strm: z_streamp, head: gz_headerp) -> c_int;
+    #[link_name = zng_prefix!(deflateTune)]
+    pub fn deflateTune(
+        strm: z_streamp,
+        good_length: c_int,
+        max_lazy: c_int,
+        nice_length: c_int,
+        max_chain: c_int,
+    ) -> c_int;
+    #[link_name = zng_prefix!(inflate)]
+    pub fn inflate(strm: z_streamp, flush: c_int) -> c_int;
+    #[link_name = zng_prefix!(inflateBack)]
+    pub fn inflateBack(
+        strm: z_streamp,
+        _in: in_func,
+        in_desc: *mut c_void,
+        out: out_func,
+        out_desc: *mut c_void,
+    ) -> c_int;
+    #[link_name = zng_prefix!(inflateBackEnd)]
+    pub fn inflateBackEnd(strm: z_streamp) -> c_int;
+    #[link_name = zng_prefix!(inflateCopy)]
+    pub fn inflateCopy(dest: z_streamp, source: z_streamp) -> c_int;
+    #[link_name = zng_prefix!(inflateEnd)]
+    pub fn inflateEnd(strm: z_streamp) -> c_int;
+    #[link_name = zng_prefix!(inflateGetHeader)]
+    pub fn inflateGetHeader(strm: z_streamp, head: gz_headerp) -> c_int;
+    #[link_name = zng_prefix!(inflateMark)]
+    pub fn inflateMark(strm: z_streamp) -> c_long;
+    #[link_name = zng_prefix!(inflatePrime)]
+    pub fn inflatePrime(strm: z_streamp, bits: c_int, value: c_int) -> c_int;
+    #[link_name = zng_prefix!(inflateReset)]
+    pub fn inflateReset(strm: z_streamp) -> c_int;
+    #[link_name = zng_prefix!(inflateReset2)]
+    pub fn inflateReset2(strm: z_streamp, windowBits: c_int) -> c_int;
+    #[link_name = zng_prefix!(inflateSetDictionary)]
+    pub fn inflateSetDictionary(
+        strm: z_streamp,
+        dictionary: *const Bytef,
+        dictLength: uInt,
+    ) -> c_int;
+    #[link_name = zng_prefix!(inflateSync)]
+    pub fn inflateSync(strm: z_streamp) -> c_int;
+    #[link_name = zng_prefix!(zlibCompileFlags)]
+    pub fn zlibCompileFlags() -> uLong;
+
+    // The above set of functions currently target 1.2.3.4 (what's present on Ubuntu
+    // 12.04, but there's some other APIs that were added later. Should figure out
+    // how to expose them...
+    //
+    // Added in 1.2.5.1
+    //
+    //     pub fn deflatePending(strm: z_streamp,
+    //                           pending: *mut c_uint,
+    //                           bits: *mut c_int) -> c_int;
+    //
+    // Addedin 1.2.7.1
+    //     pub fn inflateGetDictionary(strm: z_streamp,
+    //                                 dictionary: *mut Bytef,
+    //                                 dictLength: *mut uInt) -> c_int;
+    //
+    // Added in 1.2.3.5
+    //     pub fn gzbuffer(file: gzFile, size: c_uint) -> c_int;
+    //     pub fn gzclose_r(file: gzFile) -> c_int;
+    //     pub fn gzclose_w(file: gzFile) -> c_int;
+    //     pub fn gzoffset(file: gzFile) -> z_off_t;
+}
+
+extern "C" {
+    #[link_name = if_zng!("zlibng_version", "zlibVersion")]
+    pub fn zlibVersion() -> *const c_char;
+}
+
+#[cfg(not(zng))]
+extern "C" {
+    pub fn deflateInit_(
+        strm: z_streamp,
+        level: c_int,
+        version: *const c_char,
+        stream_size: c_int,
+    ) -> c_int;
+    pub fn deflateInit2_(
+        strm: z_streamp,
+        level: c_int,
+        method: c_int,
+        windowBits: c_int,
+        memLevel: c_int,
+        strategy: c_int,
+        version: *const c_char,
+        stream_size: c_int,
+    ) -> c_int;
+    pub fn inflateBackInit_(
+        strm: z_streamp,
+        windowBits: c_int,
+        window: *mut c_uchar,
+        version: *const c_char,
+        stream_size: c_int,
+    ) -> c_int;
+    pub fn inflateInit_(strm: z_streamp, version: *const c_char, stream_size: c_int) -> c_int;
+    pub fn inflateInit2_(
+        strm: z_streamp,
+        windowBits: c_int,
+        version: *const c_char,
+        stream_size: c_int,
+    ) -> c_int;
+}
+
+#[cfg(zng)]
+extern "C" {
+    pub fn zng_deflateInit(strm: z_streamp, level: c_int) -> c_int;
+    pub fn zng_deflateInit2(
+        strm: z_streamp,
+        level: c_int,
+        method: c_int,
+        windowBits: c_int,
+        memLevel: c_int,
+        strategy: c_int,
+    ) -> c_int;
+    pub fn zng_inflateBackInit(strm: z_streamp, windowBits: c_int, window: *mut c_uchar) -> c_int;
+    pub fn zng_inflateInit(strm: z_streamp) -> c_int;
+    pub fn zng_inflateInit2(strm: z_streamp, windowBits: c_int) -> c_int;
+}
+
+// These methods are required to keep BC with original zlib API since zlib-ng 2.1 that changed API
+#[cfg(zng)]
+#[inline(always)]
+pub unsafe fn inflateInit2_(
+    strm: z_streamp,
+    windowBits: c_int,
+    _version: *const c_char,
+    _stream_size: c_int,
+) -> c_int {
+    zng_inflateInit2(strm, windowBits)
+}
+
+#[cfg(zng)]
+#[inline(always)]
+pub unsafe fn inflateInit_(strm: z_streamp, _version: *const c_char, _stream_size: c_int) -> c_int {
+    zng_inflateInit(strm)
+}
+
+#[cfg(zng)]
+#[inline(always)]
+pub unsafe fn inflateBackInit_(
+    strm: z_streamp,
+    windowBits: c_int,
+    window: *mut c_uchar,
+    _version: *const c_char,
+    _stream_size: c_int,
+) -> c_int {
+    zng_inflateBackInit(strm, windowBits, window)
+}
+
+#[cfg(zng)]
+#[inline(always)]
+pub unsafe fn deflateInit2_(
+    strm: z_streamp,
+    level: c_int,
+    method: c_int,
+    windowBits: c_int,
+    memLevel: c_int,
+    strategy: c_int,
+    _version: *const c_char,
+    _stream_size: c_int,
+) -> c_int {
+    zng_deflateInit2(strm, level, method, windowBits, memLevel, strategy)
+}
+
+#[cfg(zng)]
+#[inline]
+pub unsafe fn deflateInit_(
+    strm: z_streamp,
+    level: c_int,
+    _version: *const c_char,
+    _stream_size: c_int,
+) -> c_int {
+    zng_deflateInit(strm, level)
+}
+
+#[cfg(any(zng, feature = "libc"))]
+extern "C" {
+    #[link_name = zng_prefix!(adler32_combine)]
+    pub fn adler32_combine(adler1: z_checksum, adler2: z_checksum, len2: z_off_t) -> z_checksum;
+    #[link_name = zng_prefix!(compress)]
+    pub fn compress(
+        dest: *mut Bytef,
+        destLen: *mut z_size,
+        source: *const Bytef,
+        sourceLen: z_size,
+    ) -> c_int;
+    #[link_name = zng_prefix!(compress2)]
+    pub fn compress2(
+        dest: *mut Bytef,
+        destLen: *mut z_size,
+        source: *const Bytef,
+        sourceLen: z_size,
+        level: c_int,
+    ) -> c_int;
+    #[link_name = zng_prefix!(compressBound)]
+    pub fn compressBound(sourceLen: z_size) -> z_size;
+    #[link_name = zng_prefix!(crc32_combine)]
+    pub fn crc32_combine(crc1: z_checksum, crc2: z_checksum, len2: z_off_t) -> z_checksum;
+    #[link_name = zng_prefix!(gzdirect)]
+    pub fn gzdirect(file: gzFile) -> c_int;
+    #[link_name = zng_prefix!(gzdopen)]
+    pub fn gzdopen(fd: c_int, mode: *const c_char) -> gzFile;
+    #[link_name = zng_prefix!(gzclearerr)]
+    pub fn gzclearerr(file: gzFile);
+    #[link_name = zng_prefix!(gzclose)]
+    pub fn gzclose(file: gzFile) -> c_int;
+    #[link_name = zng_prefix!(gzeof)]
+    pub fn gzeof(file: gzFile) -> c_int;
+    #[link_name = zng_prefix!(gzerror)]
+    pub fn gzerror(file: gzFile, errnum: *mut c_int) -> *const c_char;
+    #[link_name = zng_prefix!(gzflush)]
+    pub fn gzflush(file: gzFile, flush: c_int) -> c_int;
+    #[link_name = zng_prefix!(gzgetc)]
+    pub fn gzgetc(file: gzFile) -> c_int;
+    #[link_name = zng_prefix!(gzgets)]
+    pub fn gzgets(file: gzFile, buf: *mut c_char, len: c_int) -> *mut c_char;
+    #[link_name = zng_prefix!(gzopen)]
+    pub fn gzopen(path: *const c_char, mode: *const c_char) -> gzFile;
+    #[link_name = zng_prefix!(gzputc)]
+    pub fn gzputc(file: gzFile, c: c_int) -> c_int;
+    #[link_name = zng_prefix!(gzputs)]
+    pub fn gzputs(file: gzFile, s: *const c_char) -> c_int;
+    #[link_name = zng_prefix!(gzread)]
+    pub fn gzread(file: gzFile, buf: voidp, len: c_uint) -> c_int;
+    #[link_name = zng_prefix!(gzrewind)]
+    pub fn gzrewind(file: gzFile) -> c_int;
+    #[link_name = zng_prefix!(gzseek)]
+    pub fn gzseek(file: gzFile, offset: z_off_t, whence: c_int) -> z_off_t;
+    #[link_name = zng_prefix!(gzsetparams)]
+    pub fn gzsetparams(file: gzFile, level: c_int, strategy: c_int) -> c_int;
+    #[link_name = zng_prefix!(gztell)]
+    pub fn gztell(file: gzFile) -> z_off_t;
+    #[link_name = zng_prefix!(gzungetc)]
+    pub fn gzungetc(c: c_int, file: gzFile) -> c_int;
+    #[link_name = zng_prefix!(gzwrite)]
+    pub fn gzwrite(file: gzFile, buf: voidpc, len: c_uint) -> c_int;
+    #[link_name = zng_prefix!(uncompress)]
+    pub fn uncompress(
+        dest: *mut Bytef,
+        destLen: *mut z_size,
+        source: *const Bytef,
+        sourceLen: z_size,
+    ) -> c_int;
+}
+
+pub const Z_NO_FLUSH: c_int = 0;
+pub const Z_PARTIAL_FLUSH: c_int = 1;
+pub const Z_SYNC_FLUSH: c_int = 2;
+pub const Z_FULL_FLUSH: c_int = 3;
+pub const Z_FINISH: c_int = 4;
+pub const Z_BLOCK: c_int = 5;
+pub const Z_TREES: c_int = 6;
+
+pub const Z_OK: c_int = 0;
+pub const Z_STREAM_END: c_int = 1;
+pub const Z_NEED_DICT: c_int = 2;
+pub const Z_ERRNO: c_int = -1;
+pub const Z_STREAM_ERROR: c_int = -2;
+pub const Z_DATA_ERROR: c_int = -3;
+pub const Z_MEM_ERROR: c_int = -4;
+pub const Z_BUF_ERROR: c_int = -5;
+pub const Z_VERSION_ERROR: c_int = -6;
+
+pub const Z_NO_COMPRESSION: c_int = 0;
+pub const Z_BEST_SPEED: c_int = 1;
+pub const Z_BEST_COMPRESSION: c_int = 9;
+pub const Z_DEFAULT_COMPRESSION: c_int = -1;
+
+pub const Z_FILTERED: c_int = 1;
+pub const Z_HUFFMAN_ONLY: c_int = 2;
+pub const Z_RLE: c_int = 3;
+pub const Z_FIXED: c_int = 4;
+pub const Z_DEFAULT_STRATEGY: c_int = 0;
+
+pub const Z_BINARY: c_int = 0;
+pub const Z_TEXT: c_int = 1;
+pub const Z_ASCII: c_int = Z_TEXT;
+pub const Z_UNKNOWN: c_int = 2;
+
+pub const Z_DEFLATED: c_int = 8;
diff --git a/vendor/libz-sys/src/smoke.c b/vendor/libz-sys/src/smoke.c
new file mode 100644
index 0000000..f659aa7
--- /dev/null
+++ b/vendor/libz-sys/src/smoke.c
@@ -0,0 +1,5 @@
+#include <zlib.h>
+
+int main() {
+  return (int) adler32;
+}