mozjpeg-sys 2.2.3

use std::env;
use std::fs;
use std::io::Write;
#[allow(unused_imports)]
use std::path::{Path, PathBuf};
use std::str::FromStr;

fn compiler(config_dir: &Path, vendor: &Path) -> cc::Build {
    let mut c = cc::Build::new();
    c.include(config_dir);
    c.include(vendor);
    c.pic(true);
    c.warnings(false);

    if let Ok(target_cpu) = env::var("TARGET_CPU") {
        c.flag_if_supported(&format!("-march={target_cpu}"));
    }

    if cfg!(feature = "unwinding") {
        c.flag_if_supported("-fexceptions");
    }

    c
}

fn main() {
    let root = PathBuf::from(env::var_os("CARGO_MANIFEST_DIR").expect("CARGO_MANIFEST_DIR not set"));
    let root = dunce::canonicalize(root).expect("root dir");
    let out_dir = PathBuf::from(env::var_os("OUT_DIR").expect("outdir"));
    let config_dir = out_dir.join("include");
    let vendor = root.join("vendor");
    println!("cargo:rerun-if-changed={}", vendor.display());

    // cc crate needs emscripten target to use correct `ar`
    if env::var("TARGET").map_or(false, |t| t == "wasm32-unknown-unknown") {
        println!("cargo:warning=If the build fails, try using wasm32-unknown-emscripten target instead");
        eprintln!("If the build fails, try using wasm32-unknown-emscripten target instead");
    }

    if cfg!(feature = "unwinding") && env::var_os("CARGO_CFG_PANIC").as_deref() == Some("abort".as_ref()) {
        println!("cargo:warning=libjpeg will not be able to gracefully handle errors when used with panic=abort");
    }

    let _ = fs::create_dir_all(&config_dir);

    println!("cargo:include={}", env::join_paths([&config_dir, &vendor]).expect("inc").to_str().expect("inc"));
    let mut c = compiler(&config_dir, &vendor);

    let target_pointer_width = env::var("CARGO_CFG_TARGET_POINTER_WIDTH").expect("target");

    let files = &[
        "vendor/jcapimin.c", "vendor/jcapistd.c", "vendor/jccoefct.c", "vendor/jccolor.c",
        "vendor/jcdctmgr.c", "vendor/jcext.c", "vendor/jchuff.c", "vendor/jcinit.c",
        "vendor/jcmainct.c", "vendor/jcmarker.c", "vendor/jcmaster.c", "vendor/jcomapi.c",
        "vendor/jcparam.c", "vendor/jcphuff.c", "vendor/jcprepct.c", "vendor/jcsample.c",
        "vendor/jctrans.c", "vendor/jdapimin.c", "vendor/jdapistd.c", "vendor/jdatadst.c",
        "vendor/jdatasrc.c", "vendor/jdcoefct.c", "vendor/jdcolor.c", "vendor/jddctmgr.c",
        "vendor/jdhuff.c", "vendor/jdinput.c", "vendor/jdmainct.c", "vendor/jdmarker.c",
        "vendor/jdmaster.c", "vendor/jdmerge.c", "vendor/jdphuff.c", "vendor/jdpostct.c",
        "vendor/jdsample.c", "vendor/jdtrans.c", "vendor/jerror.c", "vendor/jfdctflt.c",
        "vendor/jfdctfst.c", "vendor/jfdctint.c", "vendor/jidctflt.c", "vendor/jidctfst.c",
        "vendor/jidctint.c", "vendor/jidctred.c", "vendor/jmemmgr.c", "vendor/jmemnobs.c",
        "vendor/jquant1.c", "vendor/jquant2.c", "vendor/jutils.c",
    ];

    for file in files {
        assert!(Path::new(file).exists(), "C file is missing. Maybe you need to run `git submodule update --init`?");
        c.file(file);
    }

    if cfg!(feature = "icc_io") {
        c.file("vendor/jcicc.c");
        c.file("vendor/jdicc.c");
    }

    let abi = if cfg!(feature = "jpeg80_abi") {
        "80"
    } else if cfg!(feature = "jpeg70_abi") {
        "70"
    } else {
        "62"
    };
    println!("cargo:lib_version={abi}");

    let pkg_version = env::var("CARGO_PKG_VERSION").expect("pkg");

    fs::write(config_dir.join("jversion.h"), format!("
        #define JVERSION \"{pkg_version}\"
        #define JCOPYRIGHT \"Copyright (C)  The libjpeg-turbo Project, Mozilla, and many others\"
        #define JCOPYRIGHT_SHORT JCOPYRIGHT
    ")).expect("jversion");

    println!("cargo:rerun-if-env-changed=SOURCE_DATE_EPOCH");
    let timestamp: u64 = if let Ok(epoch) = env::var("SOURCE_DATE_EPOCH") {
        u64::from_str(epoch.as_str()).expect("Invalid SOURCE_DATE_EPOCH environment variable")
    } else {
        std::time::UNIX_EPOCH.elapsed().unwrap().as_secs()
    };

    let mut jconfigint_h = fs::File::create(config_dir.join("jconfigint.h")).expect("jconfint");
    writeln!(jconfigint_h, r#"
        #define BUILD "{timestamp}-mozjpeg-sys"
        #ifndef INLINE
            #if defined(__clang__) || defined(__GNUC__)
                #define INLINE inline __attribute__((always_inline))
            #elif defined(_MSC_VER)
                #define INLINE __forceinline
            #else
                #define INLINE inline
            #endif
        #endif
        #ifndef HIDDEN
            #if defined(__clang__) || defined(__GNUC__)
                #define HIDDEN  __attribute__((visibility("hidden")))
            #endif
        #endif
        #ifndef THREAD_LOCAL
            #if defined (_MSC_VER)
                #define HAVE_THREAD_LOCAL
                #define THREAD_LOCAL  __declspec(thread)
            #elif defined(__clang__) || defined(__GNUC__)
                #define HAVE_THREAD_LOCAL
                #define THREAD_LOCAL  __thread
            #else
                #define THREAD_LOCAL
            #endif
        #endif
        #define SIZEOF_SIZE_T {SIZEOF_SIZE_T}
        #ifndef HAVE_BUILTIN_CTZL
            #if defined (_MSC_VER)
                #if (SIZEOF_SIZE_T == 8)
                    #define HAVE_BITSCANFORWARD64
                #elif (SIZEOF_SIZE_T == 4)
                    #define HAVE_BITSCANFORWARD
                #endif
            #elif defined(__clang__) || defined(__GNUC__)
                #define HAVE_BUILTIN_CTZL 1
            #endif
        #endif
        #define FALLTHROUGH
        #define PACKAGE_NAME "{PACKAGE_NAME}"
        #define VERSION "{VERSION}"
        "#,
        timestamp = timestamp,
        PACKAGE_NAME = env::var("CARGO_PKG_NAME").expect("pkg"),
        VERSION = pkg_version,
        SIZEOF_SIZE_T = if target_pointer_width == "32" {4} else {8}
    ).expect("write");
    drop(jconfigint_h); // close the file

    let mut jconfig_h = fs::File::create(config_dir.join("jconfig.h")).expect("jconf");
    writeln!(jconfig_h, r#"
        #define JPEG_LIB_VERSION {abi}
        #define LIBJPEG_TURBO_VERSION 0
        #define BITS_IN_JSAMPLE 8
        #define STDC_HEADERS 1
        #define NO_GETENV 1
        #define NO_PUTENV 1
        #define HAVE_STDLIB_H 1
        #define HAVE_UNSIGNED_CHAR 1
        #define HAVE_UNSIGNED_SHORT 1
        #define MEM_SRCDST_SUPPORTED 1
        "#
    ).expect("write");

    let target_os = env::var("CARGO_CFG_TARGET_OS").unwrap_or_default();
    if target_os == "ios" && env::var_os("IPHONEOS_DEPLOYMENT_TARGET").is_none() {
        // thread-local storage is not supported on iOS 9
        unsafe { env::set_var("IPHONEOS_DEPLOYMENT_TARGET", "14.0") };
    }

    if cfg!(feature = "arith_enc") {
        jconfig_h.write_all(b"#define C_ARITH_CODING_SUPPORTED 1\n").expect("write");
        c.file("vendor/jcarith.c");
    }
    if cfg!(feature = "arith_dec") {
        jconfig_h.write_all(b"#define D_ARITH_CODING_SUPPORTED 1\n").expect("write");
        c.file("vendor/jdarith.c");
    }

    if cfg!(feature = "arith_enc") || cfg!(feature = "arith_dec") {
        c.file("vendor/jaricom.c");
    }

    if cfg!(feature = "jpegtran") {
        c.file("vendor/transupp.c");
    }

    if cfg!(feature = "turbojpeg_api") {
        c.file("vendor/turbojpeg.c");
        c.file("vendor/jdatadst-tj.c");
        c.file("vendor/jdatasrc-tj.c");
    }

    // cfg!(target_arch) doesn't work for cross-compiling.
    let target_arch = env::var("CARGO_CFG_TARGET_ARCH").expect("arch");

    let nasm_needed_for_arch = target_arch == "x86_64" || target_arch == "x86";

    let with_simd = cfg!(feature = "with_simd")
        && target_arch != "wasm32" // no WASM-SIMD support here
        && if nasm_needed_for_arch { nasm_supported() } else { gas_supported(&c) };

    #[cfg(feature = "with_simd")]
    {
        let asm_used_for_arch = nasm_needed_for_arch || matches!(target_arch.as_str(), "arm" | "aarch64" | "mips");
        if with_simd {
            let simd_dir = vendor.join("simd");
            c.include(&simd_dir);
            if env::var_os("MOZJPEG_ALLOW_PROC_FOPEN").is_none_or(|v| v == "0") {
                c.define("NO_PROC_FOPEN", Some("1")); // open /proc/cpuinfo breaks my seccomp
            }

            jconfig_h.write_all(b"#define WITH_SIMD 1\n").unwrap();

            // this is generated by cmake, mainly to check compat with intrinsics
            // but we use the older asm versions anyway
            std::fs::write(config_dir.join("neon-compat.h"), r#"
                /* Define compiler-independent count-leading-zeros and byte-swap macros */
                #if defined(_MSC_VER) && !defined(__clang__)
                #define BUILTIN_CLZ(x)  _CountLeadingZeros(x)
                #define BUILTIN_CLZLL(x)  _CountLeadingZeros64(x)
                #define BUILTIN_BSWAP32(x)  _byteswap_ulong(x)
                #define BUILTIN_BSWAP64(x)  _byteswap_uint64(x)
                #elif defined(__clang__) || defined(__GNUC__)
                #define BUILTIN_CLZ(x)  __builtin_clz(x)
                #define BUILTIN_CLZLL(x)  __builtin_clzll(x)
                #define BUILTIN_BSWAP32(x)  __builtin_bswap32(x)
                #define BUILTIN_BSWAP64(x)  __builtin_bswap64(x)
                #else
                #error "Unknown compiler"
                #endif
                "#).unwrap();

            if target_arch == "arm" || target_arch == "aarch64" {
                c.include(simd_dir.join("arm"));
                c.flag_if_supported("-mfpu=neon");
                c.file("vendor/simd/arm/jcgray-neon.c");
                c.file("vendor/simd/arm/jcphuff-neon.c");
                c.file("vendor/simd/arm/jcsample-neon.c");
                c.file("vendor/simd/arm/jdmerge-neon.c");
                c.file("vendor/simd/arm/jdsample-neon.c");
                c.file("vendor/simd/arm/jfdctfst-neon.c");
                c.file("vendor/simd/arm/jidctred-neon.c");
                c.file("vendor/simd/arm/jquanti-neon.c");
            }

            match target_arch.as_str() {
                "x86_64" => {
                    c.flag_if_supported("-msse");
                    c.file("vendor/simd/x86_64/jsimd.c");
                },
                "x86" => {
                    c.flag_if_supported("-msse");
                    c.file("vendor/simd/i386/jsimd.c");
                },
                "mips" => {c.file("vendor/simd/mips/jsimd.c");},
                "powerpc" | "powerpc64" => {
                    c.flag_if_supported("-maltivec");
                    c.file("vendor/simd/powerpc/jsimd.c");
                },
                "arm" => {
                    c.file("vendor/simd/arm/aarch32/jchuff-neon.c");
                    c.file("vendor/simd/arm/jdcolor-neon.c");
                    c.file("vendor/simd/arm/jfdctint-neon.c");
                    c.file("vendor/simd/arm/aarch32/jsimd.c");
                },
                "aarch64" => {
                    c.file("vendor/simd/arm/jidctfst-neon.c");
                    c.file("vendor/simd/arm/aarch64/jsimd.c");
                },
                _ => {},
            }
            if asm_used_for_arch {
                if nasm_needed_for_arch {
                    #[cfg(feature = "nasm_simd")]
                    {
                        for obj in build_nasm(&root, &vendor, &out_dir, &target_arch, &target_os) {
                            c.object(obj);
                        }
                    }
                } else {
                    build_gas(compiler(&config_dir, &vendor), &target_arch, abi);
                };
            }
        }
    }
    drop(jconfig_h); // close the file

    if !with_simd {
        c.file("vendor/jsimd_none.c");
    }

    c.compile(&format!("mozjpeg{abi}"));
}

fn gas_supported(c: &cc::Build) -> bool {
    let supported = c.try_get_compiler().is_ok_and(|c| !c.is_like_msvc());
    if !supported {
        println!("cargo:warning=SIMD needs GNU Assembler, but MSVC is used");
    }
    supported
}

fn nasm_supported() -> bool {
    if cfg!(feature = "nasm_simd") {
        match std::process::Command::new("nasm").arg("-v").output() {
            Err(e) => {
                println!("cargo:warning=NASM not installed. Mozjpeg's SIMD won't be enabled: {e}");
                false
            },
            Ok(out) => {
                let ver = String::from_utf8_lossy(&out.stdout);
                if ver.contains("NASM version 0.") {
                    println!("cargo:warning=Installed NASM is outdated and useless. Mozjpeg's SIMD won't be enabled: {ver}");
                    false
                } else {
                    true
                }
            }
        }
    } else {
        false
    }
}

#[cfg(feature = "with_simd")]
fn build_gas(mut c: cc::Build, target_arch: &str, abi: &str) {
    c.file(match target_arch {
        "arm" => "vendor/simd/arm/aarch32/jsimd_neon.S",
        "aarch64" => "vendor/simd/arm/aarch64/jsimd_neon.S",
        "mips" => "vendor/simd/mips/jsimd_dspr2.S",
        _ => {
            panic!("\"with_simd\" feature flag has been enabled in mozjpeg-sys crate on {target_arch} platform, which is does not have SIMD acceleration in MozJPEG. Disable SIMD or compile for x86/ARM/MIPS.");
        },
    });
    c.flag("-xassembler-with-cpp");

    c.compile(&format!("mozjpegsimd{abi}"));
}

#[cfg(feature = "nasm_simd")]
fn build_nasm(root: &Path, vendor_dir: &Path, out_dir: &Path, target_arch: &str, target_os: &str) -> Vec<PathBuf> {
    let mut n = nasm_rs::Build::new();
    n.out_dir(out_dir);

    if std::env::var("PROFILE").ok().map_or(false, |s| "debug" == s) {
        n.debug(true);
    }

    n.define("PIC", None); // Rust always uses -fPIC

    match (target_os, target_arch.ends_with("64")) {
        ("windows", false) => n.define("WIN32", None),
        ("windows", true) => n.define("WIN64", None),
        ("macos" | "ios", _) => n.define("MACHO", None),
        _ => n.define("ELF", None),
    };

    let arch_name = match target_arch {
        "x86" => "i386",
        "x86_64" => {
            n.define("__x86_64__", None);
            "x86_64"
        },
        _ => panic!("Bug: mozjpeg-sys build script is broken on {target_arch}"),
    };

    // these should have had .inc extension
    let dont_compile = ["jccolext-avx2.asm", "jccolext-mmx.asm", "jccolext-sse2.asm", "jcgryext-avx2.asm",
        "jcgryext-mmx.asm", "jcgryext-sse2.asm", "jdcolext-avx2.asm", "jdcolext-mmx.asm",
        "jdcolext-sse2.asm", "jdmrgext-avx2.asm", "jdmrgext-mmx.asm", "jdmrgext-sse2.asm"];

    let simd_dir = vendor_dir.join("simd");
    let simd_arch_dir = simd_dir.join(arch_name);
    n.include(&simd_arch_dir);
    n.include(simd_dir.join("nasm"));
    n.include(vendor_dir.join("win"));
    for entry in fs::read_dir(simd_arch_dir).expect("simd subdir missing") {
        let entry = entry.unwrap();
        let path = entry.path();
        let included = path.extension().map_or(false, |e| e == "asm");
        let excluded = path.file_name().map_or(true, |f| dont_compile.iter().any(|&e| e == f));
        if included && !excluded {
            n.file(path.strip_prefix(root).unwrap_or(&path));
        }
    }
    n.compile_objects().expect("NASM build failed")
}