package {
    default_applicable_licenses: ["external_zlib_license"],
}

license {
    name: "external_zlib_license",
    visibility: [":__subpackages__"],
    license_kinds: [
        "SPDX-license-identifier-BSD",
        "SPDX-license-identifier-Zlib",
    ],
    license_text: [
        "LICENSE",
    ],
}

// These cflags are shared --- not only between all architectures,
// but between libz and libz_stable too.
cflags_shared = [
    // Our compiler does support hidden visibility.
    "-DHAVE_HIDDEN",
    // Our compiler does support const.
    "-DZLIB_CONST",
    // Use the traditional Rabin-Karp rolling hash to match zlib DEFLATE output exactly.
    "-DCHROMIUM_ZLIB_NO_CASTAGNOLI",
    // Enable -O3 for everyone, as chromium's BUILD.gn does.
    "-O3",
    "-Wall",
    "-Werror",
    "-Wno-deprecated-non-prototype",
    "-Wno-unused",
    "-Wno-unused-parameter",
]

cflags_arm = [
    // Even the NDK dropped non-neon support in r24.
    "-DADLER32_SIMD_NEON",
    // HWCAP_CRC32 is checked at runtime, so it's okay to enable crc32
    // acceleration for both 64-bit and 32-bit (which may be armv7, at
    // least for NDK users).
    "-DCRC32_ARMV8_CRC32",
    // TODO: DINFLATE_CHUNK_SIMD_NEON causes `atest org.apache.harmony.tests.java.util.zip.DeflaterTest` failures.
    // "-DINFLATE_CHUNK_SIMD_NEON",
]
cflags_arm64 = cflags_arm + ["-DINFLATE_CHUNK_READ_64LE"]

cflags_riscv64 = [
    "-DRISCV_RVV",
    "-DADLER32_SIMD_RVV",
    "-DDEFLATE_SLIDE_HASH_RVV",
    "-DINFLATE_CHUNK_GENERIC",
    "-DINFLATE_CHUNK_READ_64LE",
]

// The *host* x86 configuration (with *lower* CPU feature requirements).
cflags_x86 = [
    // See ARMV8_OS_LINUX above.
    "-DX86_NOT_WINDOWS",
    // Android's host CPU feature requirements are *lower* than the
    // corresponding device CPU feature requirements, so it's easier to just
    // say "no SIMD for you" rather than specificially disable SSSE3.
    // We should have a conversation about that, but not until we at least have
    // data on how many Studio users have CPUs that don't make the grade...
    // https://issuetracker.google.com/171235570
    "-DCPU_NO_SIMD",
]
cflags_x86_64 = cflags_x86 + ["-DINFLATE_CHUNK_READ_64LE"]

// The additional *device* x86/x86_64 configuration. Devices have *higher* CPU
// feature requirements than the host.
cflags_android_x86 = [
    // Android's x86 and x86-64 ABIs both include SSE2 and SSSE3.
    "-UCPU_NO_SIMD",
    "-DADLER32_SIMD_SSSE3",
    // TODO: DINFLATE_CHUNK_SIMD_SSE2 causes `atest org.apache.harmony.tests.java.util.zip.DeflaterTest` failures.
    // "-DINFLATE_CHUNK_SIMD_SSE2",
]

libz_srcs = [
    "adler32.c",
    "adler32_simd.c",
    "compress.c",
    "cpu_features.c",
    "crc32.c",
    "crc32_simd.c",
    "crc_folding.c",
    "deflate.c",
    "gzclose.c",
    "gzlib.c",
    "gzread.c",
    "gzwrite.c",
    "infback.c",
    "inffast.c",
    "inflate.c",
    "inftrees.c",
    "trees.c",
    "uncompr.c",
    "zutil.c",

    // Not-yet-enabled optimizations.
    // See https://chromium-review.googlesource.com/749732.
    // TODO: causes `atest org.apache.harmony.tests.java.util.zip.DeflaterTest` failures.
    //    "contrib/optimizations/inffast_chunk.c",
    //    "contrib/optimizations/inflate.c",
]

cc_defaults {
    name: "libz_defaults",
    defaults: [
        "bug_24465209_workaround",
    ],

    cflags: cflags_shared,
    stl: "none",
    export_include_dirs: ["."],

    host_supported: true,
    native_bridge_supported: true,

    vendor_available: true,
    product_available: true,
    ramdisk_available: true,
    vendor_ramdisk_available: true,
    recovery_available: true,

    arch: {
        arm: {
            cflags: cflags_arm,
        },
        arm64: {
            cflags: cflags_arm64,
        },
        riscv64: {
            cflags: cflags_riscv64,
        },
        x86: {
            cflags: cflags_x86,
        },
        x86_64: {
            cflags: cflags_x86_64,
        },
    },
    target: {
        android_arm: {
            cflags: [
                // Since we're building for the platform, we claim to be Linux rather than
                // Android so we use getauxval() directly instead of the NDK
                // android_getCpuFeatures which isn't available to us anyway.
                "-DARMV8_OS_LINUX",
            ],
        },
        android_x86: {
            cflags: cflags_android_x86,
        },
        android_x86_64: {
            cflags: cflags_android_x86,
        },
        darwin_arm64: {
            cflags: [
                "-DARMV8_OS_MACOS",
            ],
        },
        linux_bionic: {
            enabled: true,
        },
        linux_arm64: {
            cflags: [
                // Since we're building for the platform, we claim to be Linux rather than
                // Android so we use getauxval() directly instead of the NDK
                // android_getCpuFeatures which isn't available to us anyway.
                "-DARMV8_OS_LINUX",
            ],
        },
        windows: {
            enabled: true,
        },
    },
}

cc_library {
    name: "libz",
    defaults: ["libz_defaults"],

    srcs: libz_srcs,

    unique_host_soname: true,
    static_ndk_lib: true,

    double_loadable: true,

    stubs: {
        versions: [
            "29",
            "30",
        ],
        symbol_file: "libz.map.txt",
    },

    // linker/linker64 statically link zlib.
    static: {
        apex_available: [
            "com.android.runtime",
        ],
    },

    // When used by Vendor/Product APEX,
    // libz should be treated like non-stable module.
    // (Hence, should be bundled in APEX).
    target: {
        product: {
            no_stubs: true,
        },
        vendor: {
            no_stubs: true,
        },
    },

    afdo: true,
}

// A build of libz with identical behavior between architectures.
// Used by legacy OTA tools such as imgdiff and updater and their tests.
// New code should not use this library, because new code should not make
// assumptions about the _compressed_ bits, beyond the fact that they will
// decompress to the same input bytes. The actual compressed byte sequences
// can and do differ over time.
cc_library {
    name: "libz_stable",
    visibility: [
        "//bootable/recovery/applypatch",
        "//bootable/recovery/tests",
        "//bootable/recovery/updater",
        "//bootable/deprecated-ota/applypatch",
        "//bootable/deprecated-ota/tests",
        "//bootable/deprecated-ota/updater",
    ],
    // We only use the shared flags here; the whole point is that this
    // library behaves the same on all different architectures.
    cflags: cflags_shared,
    stl: "none",
    export_include_dirs: ["."],
    srcs: libz_srcs,
    host_supported: true,
    vendor_available: true,
    recovery_available: true,
}

cc_binary {
    name: "zlib_bench",
    srcs: ["contrib/bench/zlib_bench.cc"],
    cflags: [
        "-Wall",
        "-Werror",
        "-Wno-deprecated-non-prototype",
        "-Wno-unused-parameter",
    ],
    host_supported: true,
    shared_libs: ["libz"],
    // We build zlib_bench32 and zlib_bench64 so it's easy to test LP32.
    compile_multilib: "both",
    multilib: {
        lib32: {
            suffix: "32",
        },
        lib64: {
            suffix: "64",
        },
    },
}

cc_library {
    name: "zlib_google_compression_utils_portable",
    defaults: ["libz_defaults"],
    srcs: [
        "google/compression_utils_portable.cc",
    ],
    export_include_dirs: ["google"],
    host_supported: true,
    shared_libs: ["libz"],
    sdk_version: "minimum",
    visibility: ["//external/angle"],
    apex_available: [
        "com.android.runtime",
        "//apex_available:platform",
    ],
}

cc_library_static {
    name: "tflite_support_libz",
    defaults: ["libz_defaults"],
    srcs: [
        "contrib/minizip/ioapi.c",
        "contrib/minizip/unzip.c",
    ],
    sdk_version: "current",
    // TODO: switch this to "apex_inherit".
    min_sdk_version: "30",
    apex_available: [
        "//apex_available:platform",
        "com.android.adservices",
        "com.android.extservices",
    ],
}

cc_test {
    name: "zlib_tests",
    srcs: [
        "contrib/tests/infcover.cc",
        "contrib/tests/utils_unittest.cc",
    ],
    cflags: [
        "-DCMAKE_STANDALONE_UNITTESTS",
        "-Wno-unused-parameter",
    ],
    include_dirs: [
        // These tests include "gtest.h" rather than the usual "gtest/gtest.h".
        "external/googletest/googletest/include/gtest/",
    ],
    shared_libs: ["libz"],
    static_libs: ["zlib_google_compression_utils_portable"],
    host_supported: true,
    test_suites: ["device-tests"],
}

ndk_headers {
    name: "libz_headers",
    from: "",
    to: "",
    srcs: [
        "zconf.h",
        "zlib.h",
    ],
    license: "LICENSE",
}

ndk_library {
    name: "libz",
    symbol_file: "libz.map.txt",
    first_version: "9",
    unversioned_until: "current",
}

// Export zlib headers for inclusion in the musl sysroot.
genrule {
    name: "libc_musl_sysroot_zlib_headers",
    visibility: ["//external/musl"],
    srcs: [
        "LICENSE",
        "zconf.h",
        "zlib.h",
    ],
    out: ["libc_musl_sysroot_zlib_headers.zip"],
    tools: [
        "soong_zip",
        "zip2zip",
    ],
    cmd: "$(location soong_zip) -o $(genDir)/sysroot.zip -symlinks=false" +
        // NOTICE
        " -j -f $(location LICENSE) " +
        // headers
        " -j -P include " +
        "  -f $(location zconf.h) " +
        "  -f $(location zlib.h) " +
        " && " +
        "$(location zip2zip) -i $(genDir)/sysroot.zip -o $(out) " +
        " include/**/*:include " +
        " LICENSE:NOTICE.zlib",
}

cc_defaults {
    name: "zlib_fuzz_defaults",
    static_libs: ["libz"],
    host_supported: true,
}

cc_fuzz {
    name: "zlib_deflate_fuzzer",
    defaults: ["zlib_fuzz_defaults"],
    srcs: ["contrib/tests/fuzzers/deflate_fuzzer.cc"],
}

cc_fuzz {
    name: "zlib_deflate_set_dictionary_fuzzer",
    defaults: ["zlib_fuzz_defaults"],
    srcs: ["contrib/tests/fuzzers/deflate_set_dictionary_fuzzer.cc"],
}

cc_fuzz {
    name: "zlib_inflate_fuzzer",
    defaults: ["zlib_fuzz_defaults"],
    srcs: ["contrib/tests/fuzzers/inflate_fuzzer.cc"],
}

cc_fuzz {
    name: "zlib_inflate_with_header_fuzzer",
    defaults: ["zlib_fuzz_defaults"],
    srcs: ["contrib/tests/fuzzers/inflate_with_header_fuzzer.cc"],
}

cc_fuzz {
    name: "zlib_streaming_inflate_fuzzer",
    defaults: ["zlib_fuzz_defaults"],
    srcs: ["contrib/tests/fuzzers/streaming_inflate_fuzzer.cc"],
    fuzz_config: {
        libfuzzer_options: ["max_len=256000"],
    },
}

cc_fuzz {
    name: "zlib_uncompress_fuzzer",
    defaults: ["zlib_fuzz_defaults"],
    srcs: ["contrib/tests/fuzzers/uncompress_fuzzer.cc"],
}