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+#!/usr/bin/env python3
+# Generated by gyp. Do not edit.
+# Copyright (c) 2012 Google Inc. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""Utility functions to perform Xcode-style build steps.
+
+These functions are executed via gyp-mac-tool when using the Makefile generator.
+"""
+
+
+import fcntl
+import fnmatch
+import glob
+import json
+import os
+import plistlib
+import re
+import shutil
+import struct
+import subprocess
+import sys
+import tempfile
+
+
+def main(args):
+    executor = MacTool()
+    exit_code = executor.Dispatch(args)
+    if exit_code is not None:
+        sys.exit(exit_code)
+
+
+class MacTool:
+    """This class performs all the Mac tooling steps. The methods can either be
+  executed directly, or dispatched from an argument list."""
+
+    def Dispatch(self, args):
+        """Dispatches a string command to a method."""
+        if len(args) < 1:
+            raise Exception("Not enough arguments")
+
+        method = "Exec%s" % self._CommandifyName(args[0])
+        return getattr(self, method)(*args[1:])
+
+    def _CommandifyName(self, name_string):
+        """Transforms a tool name like copy-info-plist to CopyInfoPlist"""
+        return name_string.title().replace("-", "")
+
+    def ExecCopyBundleResource(self, source, dest, convert_to_binary):
+        """Copies a resource file to the bundle/Resources directory, performing any
+    necessary compilation on each resource."""
+        convert_to_binary = convert_to_binary == "True"
+        extension = os.path.splitext(source)[1].lower()
+        if os.path.isdir(source):
+            # Copy tree.
+            # TODO(thakis): This copies file attributes like mtime, while the
+            # single-file branch below doesn't. This should probably be changed to
+            # be consistent with the single-file branch.
+            if os.path.exists(dest):
+                shutil.rmtree(dest)
+            shutil.copytree(source, dest)
+        elif extension == ".xib":
+            return self._CopyXIBFile(source, dest)
+        elif extension == ".storyboard":
+            return self._CopyXIBFile(source, dest)
+        elif extension == ".strings" and not convert_to_binary:
+            self._CopyStringsFile(source, dest)
+        else:
+            if os.path.exists(dest):
+                os.unlink(dest)
+            shutil.copy(source, dest)
+
+        if convert_to_binary and extension in (".plist", ".strings"):
+            self._ConvertToBinary(dest)
+
+    def _CopyXIBFile(self, source, dest):
+        """Compiles a XIB file with ibtool into a binary plist in the bundle."""
+
+        # ibtool sometimes crashes with relative paths. See crbug.com/314728.
+        base = os.path.dirname(os.path.realpath(__file__))
+        if os.path.relpath(source):
+            source = os.path.join(base, source)
+        if os.path.relpath(dest):
+            dest = os.path.join(base, dest)
+
+        args = ["xcrun", "ibtool", "--errors", "--warnings", "--notices"]
+
+        if os.environ["XCODE_VERSION_ACTUAL"] > "0700":
+            args.extend(["--auto-activate-custom-fonts"])
+            if "IPHONEOS_DEPLOYMENT_TARGET" in os.environ:
+                args.extend(
+                    [
+                        "--target-device",
+                        "iphone",
+                        "--target-device",
+                        "ipad",
+                        "--minimum-deployment-target",
+                        os.environ["IPHONEOS_DEPLOYMENT_TARGET"],
+                    ]
+                )
+            else:
+                args.extend(
+                    [
+                        "--target-device",
+                        "mac",
+                        "--minimum-deployment-target",
+                        os.environ["MACOSX_DEPLOYMENT_TARGET"],
+                    ]
+                )
+
+        args.extend(
+            ["--output-format", "human-readable-text", "--compile", dest, source]
+        )
+
+        ibtool_section_re = re.compile(r"/\*.*\*/")
+        ibtool_re = re.compile(r".*note:.*is clipping its content")
+        try:
+            stdout = subprocess.check_output(args)
+        except subprocess.CalledProcessError as e:
+            print(e.output)
+            raise
+        current_section_header = None
+        for line in stdout.splitlines():
+            if ibtool_section_re.match(line):
+                current_section_header = line
+            elif not ibtool_re.match(line):
+                if current_section_header:
+                    print(current_section_header)
+                    current_section_header = None
+                print(line)
+        return 0
+
+    def _ConvertToBinary(self, dest):
+        subprocess.check_call(
+            ["xcrun", "plutil", "-convert", "binary1", "-o", dest, dest]
+        )
+
+    def _CopyStringsFile(self, source, dest):
+        """Copies a .strings file using iconv to reconvert the input into UTF-16."""
+        input_code = self._DetectInputEncoding(source) or "UTF-8"
+
+        # Xcode's CpyCopyStringsFile / builtin-copyStrings seems to call
+        # CFPropertyListCreateFromXMLData() behind the scenes; at least it prints
+        #     CFPropertyListCreateFromXMLData(): Old-style plist parser: missing
+        #     semicolon in dictionary.
+        # on invalid files. Do the same kind of validation.
+        import CoreFoundation
+
+        with open(source, "rb") as in_file:
+            s = in_file.read()
+        d = CoreFoundation.CFDataCreate(None, s, len(s))
+        _, error = CoreFoundation.CFPropertyListCreateFromXMLData(None, d, 0, None)
+        if error:
+            return
+
+        with open(dest, "wb") as fp:
+            fp.write(s.decode(input_code).encode("UTF-16"))
+
+    def _DetectInputEncoding(self, file_name):
+        """Reads the first few bytes from file_name and tries to guess the text
+    encoding. Returns None as a guess if it can't detect it."""
+        with open(file_name, "rb") as fp:
+            try:
+                header = fp.read(3)
+            except Exception:
+                return None
+        if header.startswith(b"\xFE\xFF"):
+            return "UTF-16"
+        elif header.startswith(b"\xFF\xFE"):
+            return "UTF-16"
+        elif header.startswith(b"\xEF\xBB\xBF"):
+            return "UTF-8"
+        else:
+            return None
+
+    def ExecCopyInfoPlist(self, source, dest, convert_to_binary, *keys):
+        """Copies the |source| Info.plist to the destination directory |dest|."""
+        # Read the source Info.plist into memory.
+        with open(source) as fd:
+            lines = fd.read()
+
+        # Insert synthesized key/value pairs (e.g. BuildMachineOSBuild).
+        plist = plistlib.readPlistFromString(lines)
+        if keys:
+            plist.update(json.loads(keys[0]))
+        lines = plistlib.writePlistToString(plist)
+
+        # Go through all the environment variables and replace them as variables in
+        # the file.
+        IDENT_RE = re.compile(r"[_/\s]")
+        for key in os.environ:
+            if key.startswith("_"):
+                continue
+            evar = "${%s}" % key
+            evalue = os.environ[key]
+            lines = lines.replace(lines, evar, evalue)
+
+            # Xcode supports various suffices on environment variables, which are
+            # all undocumented. :rfc1034identifier is used in the standard project
+            # template these days, and :identifier was used earlier. They are used to
+            # convert non-url characters into things that look like valid urls --
+            # except that the replacement character for :identifier, '_' isn't valid
+            # in a URL either -- oops, hence :rfc1034identifier was born.
+            evar = "${%s:identifier}" % key
+            evalue = IDENT_RE.sub("_", os.environ[key])
+            lines = lines.replace(lines, evar, evalue)
+
+            evar = "${%s:rfc1034identifier}" % key
+            evalue = IDENT_RE.sub("-", os.environ[key])
+            lines = lines.replace(lines, evar, evalue)
+
+        # Remove any keys with values that haven't been replaced.
+        lines = lines.splitlines()
+        for i in range(len(lines)):
+            if lines[i].strip().startswith("<string>${"):
+                lines[i] = None
+                lines[i - 1] = None
+        lines = "\n".join(line for line in lines if line is not None)
+
+        # Write out the file with variables replaced.
+        with open(dest, "w") as fd:
+            fd.write(lines)
+
+        # Now write out PkgInfo file now that the Info.plist file has been
+        # "compiled".
+        self._WritePkgInfo(dest)
+
+        if convert_to_binary == "True":
+            self._ConvertToBinary(dest)
+
+    def _WritePkgInfo(self, info_plist):
+        """This writes the PkgInfo file from the data stored in Info.plist."""
+        plist = plistlib.readPlist(info_plist)
+        if not plist:
+            return
+
+        # Only create PkgInfo for executable types.
+        package_type = plist["CFBundlePackageType"]
+        if package_type != "APPL":
+            return
+
+        # The format of PkgInfo is eight characters, representing the bundle type
+        # and bundle signature, each four characters. If that is missing, four
+        # '?' characters are used instead.
+        signature_code = plist.get("CFBundleSignature", "????")
+        if len(signature_code) != 4:  # Wrong length resets everything, too.
+            signature_code = "?" * 4
+
+        dest = os.path.join(os.path.dirname(info_plist), "PkgInfo")
+        with open(dest, "w") as fp:
+            fp.write(f"{package_type}{signature_code}")
+
+    def ExecFlock(self, lockfile, *cmd_list):
+        """Emulates the most basic behavior of Linux's flock(1)."""
+        # Rely on exception handling to report errors.
+        fd = os.open(lockfile, os.O_RDONLY | os.O_NOCTTY | os.O_CREAT, 0o666)
+        fcntl.flock(fd, fcntl.LOCK_EX)
+        return subprocess.call(cmd_list)
+
+    def ExecFilterLibtool(self, *cmd_list):
+        """Calls libtool and filters out '/path/to/libtool: file: foo.o has no
+    symbols'."""
+        libtool_re = re.compile(
+            r"^.*libtool: (?:for architecture: \S* )?" r"file: .* has no symbols$"
+        )
+        libtool_re5 = re.compile(
+            r"^.*libtool: warning for library: "
+            + r".* the table of contents is empty "
+            + r"\(no object file members in the library define global symbols\)$"
+        )
+        env = os.environ.copy()
+        # Ref:
+        # http://www.opensource.apple.com/source/cctools/cctools-809/misc/libtool.c
+        # The problem with this flag is that it resets the file mtime on the file to
+        # epoch=0, e.g. 1970-1-1 or 1969-12-31 depending on timezone.
+        env["ZERO_AR_DATE"] = "1"
+        libtoolout = subprocess.Popen(cmd_list, stderr=subprocess.PIPE, env=env)
+        err = libtoolout.communicate()[1].decode("utf-8")
+        for line in err.splitlines():
+            if not libtool_re.match(line) and not libtool_re5.match(line):
+                print(line, file=sys.stderr)
+        # Unconditionally touch the output .a file on the command line if present
+        # and the command succeeded. A bit hacky.
+        if not libtoolout.returncode:
+            for i in range(len(cmd_list) - 1):
+                if cmd_list[i] == "-o" and cmd_list[i + 1].endswith(".a"):
+                    os.utime(cmd_list[i + 1], None)
+                    break
+        return libtoolout.returncode
+
+    def ExecPackageIosFramework(self, framework):
+        # Find the name of the binary based on the part before the ".framework".
+        binary = os.path.basename(framework).split(".")[0]
+        module_path = os.path.join(framework, "Modules")
+        if not os.path.exists(module_path):
+            os.mkdir(module_path)
+        module_template = (
+            "framework module %s {\n"
+            '  umbrella header "%s.h"\n'
+            "\n"
+            "  export *\n"
+            "  module * { export * }\n"
+            "}\n" % (binary, binary)
+        )
+
+        with open(os.path.join(module_path, "module.modulemap"), "w") as module_file:
+            module_file.write(module_template)
+
+    def ExecPackageFramework(self, framework, version):
+        """Takes a path to Something.framework and the Current version of that and
+    sets up all the symlinks."""
+        # Find the name of the binary based on the part before the ".framework".
+        binary = os.path.basename(framework).split(".")[0]
+
+        CURRENT = "Current"
+        RESOURCES = "Resources"
+        VERSIONS = "Versions"
+
+        if not os.path.exists(os.path.join(framework, VERSIONS, version, binary)):
+            # Binary-less frameworks don't seem to contain symlinks (see e.g.
+            # chromium's out/Debug/org.chromium.Chromium.manifest/ bundle).
+            return
+
+        # Move into the framework directory to set the symlinks correctly.
+        pwd = os.getcwd()
+        os.chdir(framework)
+
+        # Set up the Current version.
+        self._Relink(version, os.path.join(VERSIONS, CURRENT))
+
+        # Set up the root symlinks.
+        self._Relink(os.path.join(VERSIONS, CURRENT, binary), binary)
+        self._Relink(os.path.join(VERSIONS, CURRENT, RESOURCES), RESOURCES)
+
+        # Back to where we were before!
+        os.chdir(pwd)
+
+    def _Relink(self, dest, link):
+        """Creates a symlink to |dest| named |link|. If |link| already exists,
+    it is overwritten."""
+        if os.path.lexists(link):
+            os.remove(link)
+        os.symlink(dest, link)
+
+    def ExecCompileIosFrameworkHeaderMap(self, out, framework, *all_headers):
+        framework_name = os.path.basename(framework).split(".")[0]
+        all_headers = [os.path.abspath(header) for header in all_headers]
+        filelist = {}
+        for header in all_headers:
+            filename = os.path.basename(header)
+            filelist[filename] = header
+            filelist[os.path.join(framework_name, filename)] = header
+        WriteHmap(out, filelist)
+
+    def ExecCopyIosFrameworkHeaders(self, framework, *copy_headers):
+        header_path = os.path.join(framework, "Headers")
+        if not os.path.exists(header_path):
+            os.makedirs(header_path)
+        for header in copy_headers:
+            shutil.copy(header, os.path.join(header_path, os.path.basename(header)))
+
+    def ExecCompileXcassets(self, keys, *inputs):
+        """Compiles multiple .xcassets files into a single .car file.
+
+    This invokes 'actool' to compile all the inputs .xcassets files. The
+    |keys| arguments is a json-encoded dictionary of extra arguments to
+    pass to 'actool' when the asset catalogs contains an application icon
+    or a launch image.
+
+    Note that 'actool' does not create the Assets.car file if the asset
+    catalogs does not contains imageset.
+    """
+        command_line = [
+            "xcrun",
+            "actool",
+            "--output-format",
+            "human-readable-text",
+            "--compress-pngs",
+            "--notices",
+            "--warnings",
+            "--errors",
+        ]
+        is_iphone_target = "IPHONEOS_DEPLOYMENT_TARGET" in os.environ
+        if is_iphone_target:
+            platform = os.environ["CONFIGURATION"].split("-")[-1]
+            if platform not in ("iphoneos", "iphonesimulator"):
+                platform = "iphonesimulator"
+            command_line.extend(
+                [
+                    "--platform",
+                    platform,
+                    "--target-device",
+                    "iphone",
+                    "--target-device",
+                    "ipad",
+                    "--minimum-deployment-target",
+                    os.environ["IPHONEOS_DEPLOYMENT_TARGET"],
+                    "--compile",
+                    os.path.abspath(os.environ["CONTENTS_FOLDER_PATH"]),
+                ]
+            )
+        else:
+            command_line.extend(
+                [
+                    "--platform",
+                    "macosx",
+                    "--target-device",
+                    "mac",
+                    "--minimum-deployment-target",
+                    os.environ["MACOSX_DEPLOYMENT_TARGET"],
+                    "--compile",
+                    os.path.abspath(os.environ["UNLOCALIZED_RESOURCES_FOLDER_PATH"]),
+                ]
+            )
+        if keys:
+            keys = json.loads(keys)
+            for key, value in keys.items():
+                arg_name = "--" + key
+                if isinstance(value, bool):
+                    if value:
+                        command_line.append(arg_name)
+                elif isinstance(value, list):
+                    for v in value:
+                        command_line.append(arg_name)
+                        command_line.append(str(v))
+                else:
+                    command_line.append(arg_name)
+                    command_line.append(str(value))
+        # Note: actool crashes if inputs path are relative, so use os.path.abspath
+        # to get absolute path name for inputs.
+        command_line.extend(map(os.path.abspath, inputs))
+        subprocess.check_call(command_line)
+
+    def ExecMergeInfoPlist(self, output, *inputs):
+        """Merge multiple .plist files into a single .plist file."""
+        merged_plist = {}
+        for path in inputs:
+            plist = self._LoadPlistMaybeBinary(path)
+            self._MergePlist(merged_plist, plist)
+        plistlib.writePlist(merged_plist, output)
+
+    def ExecCodeSignBundle(self, key, entitlements, provisioning, path, preserve):
+        """Code sign a bundle.
+
+    This function tries to code sign an iOS bundle, following the same
+    algorithm as Xcode:
+      1. pick the provisioning profile that best match the bundle identifier,
+         and copy it into the bundle as embedded.mobileprovision,
+      2. copy Entitlements.plist from user or SDK next to the bundle,
+      3. code sign the bundle.
+    """
+        substitutions, overrides = self._InstallProvisioningProfile(
+            provisioning, self._GetCFBundleIdentifier()
+        )
+        entitlements_path = self._InstallEntitlements(
+            entitlements, substitutions, overrides
+        )
+
+        args = ["codesign", "--force", "--sign", key]
+        if preserve == "True":
+            args.extend(["--deep", "--preserve-metadata=identifier,entitlements"])
+        else:
+            args.extend(["--entitlements", entitlements_path])
+        args.extend(["--timestamp=none", path])
+        subprocess.check_call(args)
+
+    def _InstallProvisioningProfile(self, profile, bundle_identifier):
+        """Installs embedded.mobileprovision into the bundle.
+
+    Args:
+      profile: string, optional, short name of the .mobileprovision file
+        to use, if empty or the file is missing, the best file installed
+        will be used
+      bundle_identifier: string, value of CFBundleIdentifier from Info.plist
+
+    Returns:
+      A tuple containing two dictionary: variables substitutions and values
+      to overrides when generating the entitlements file.
+    """
+        source_path, provisioning_data, team_id = self._FindProvisioningProfile(
+            profile, bundle_identifier
+        )
+        target_path = os.path.join(
+            os.environ["BUILT_PRODUCTS_DIR"],
+            os.environ["CONTENTS_FOLDER_PATH"],
+            "embedded.mobileprovision",
+        )
+        shutil.copy2(source_path, target_path)
+        substitutions = self._GetSubstitutions(bundle_identifier, team_id + ".")
+        return substitutions, provisioning_data["Entitlements"]
+
+    def _FindProvisioningProfile(self, profile, bundle_identifier):
+        """Finds the .mobileprovision file to use for signing the bundle.
+
+    Checks all the installed provisioning profiles (or if the user specified
+    the PROVISIONING_PROFILE variable, only consult it) and select the most
+    specific that correspond to the bundle identifier.
+
+    Args:
+      profile: string, optional, short name of the .mobileprovision file
+        to use, if empty or the file is missing, the best file installed
+        will be used
+      bundle_identifier: string, value of CFBundleIdentifier from Info.plist
+
+    Returns:
+      A tuple of the path to the selected provisioning profile, the data of
+      the embedded plist in the provisioning profile and the team identifier
+      to use for code signing.
+
+    Raises:
+      SystemExit: if no .mobileprovision can be used to sign the bundle.
+    """
+        profiles_dir = os.path.join(
+            os.environ["HOME"], "Library", "MobileDevice", "Provisioning Profiles"
+        )
+        if not os.path.isdir(profiles_dir):
+            print(
+                "cannot find mobile provisioning for %s" % (bundle_identifier),
+                file=sys.stderr,
+            )
+            sys.exit(1)
+        provisioning_profiles = None
+        if profile:
+            profile_path = os.path.join(profiles_dir, profile + ".mobileprovision")
+            if os.path.exists(profile_path):
+                provisioning_profiles = [profile_path]
+        if not provisioning_profiles:
+            provisioning_profiles = glob.glob(
+                os.path.join(profiles_dir, "*.mobileprovision")
+            )
+        valid_provisioning_profiles = {}
+        for profile_path in provisioning_profiles:
+            profile_data = self._LoadProvisioningProfile(profile_path)
+            app_id_pattern = profile_data.get("Entitlements", {}).get(
+                "application-identifier", ""
+            )
+            for team_identifier in profile_data.get("TeamIdentifier", []):
+                app_id = f"{team_identifier}.{bundle_identifier}"
+                if fnmatch.fnmatch(app_id, app_id_pattern):
+                    valid_provisioning_profiles[app_id_pattern] = (
+                        profile_path,
+                        profile_data,
+                        team_identifier,
+                    )
+        if not valid_provisioning_profiles:
+            print(
+                "cannot find mobile provisioning for %s" % (bundle_identifier),
+                file=sys.stderr,
+            )
+            sys.exit(1)
+        # If the user has multiple provisioning profiles installed that can be
+        # used for ${bundle_identifier}, pick the most specific one (ie. the
+        # provisioning profile whose pattern is the longest).
+        selected_key = max(valid_provisioning_profiles, key=lambda v: len(v))
+        return valid_provisioning_profiles[selected_key]
+
+    def _LoadProvisioningProfile(self, profile_path):
+        """Extracts the plist embedded in a provisioning profile.
+
+    Args:
+      profile_path: string, path to the .mobileprovision file
+
+    Returns:
+      Content of the plist embedded in the provisioning profile as a dictionary.
+    """
+        with tempfile.NamedTemporaryFile() as temp:
+            subprocess.check_call(
+                ["security", "cms", "-D", "-i", profile_path, "-o", temp.name]
+            )
+            return self._LoadPlistMaybeBinary(temp.name)
+
+    def _MergePlist(self, merged_plist, plist):
+        """Merge |plist| into |merged_plist|."""
+        for key, value in plist.items():
+            if isinstance(value, dict):
+                merged_value = merged_plist.get(key, {})
+                if isinstance(merged_value, dict):
+                    self._MergePlist(merged_value, value)
+                    merged_plist[key] = merged_value
+                else:
+                    merged_plist[key] = value
+            else:
+                merged_plist[key] = value
+
+    def _LoadPlistMaybeBinary(self, plist_path):
+        """Loads into a memory a plist possibly encoded in binary format.
+
+    This is a wrapper around plistlib.readPlist that tries to convert the
+    plist to the XML format if it can't be parsed (assuming that it is in
+    the binary format).
+
+    Args:
+      plist_path: string, path to a plist file, in XML or binary format
+
+    Returns:
+      Content of the plist as a dictionary.
+    """
+        try:
+            # First, try to read the file using plistlib that only supports XML,
+            # and if an exception is raised, convert a temporary copy to XML and
+            # load that copy.
+            return plistlib.readPlist(plist_path)
+        except Exception:
+            pass
+        with tempfile.NamedTemporaryFile() as temp:
+            shutil.copy2(plist_path, temp.name)
+            subprocess.check_call(["plutil", "-convert", "xml1", temp.name])
+            return plistlib.readPlist(temp.name)
+
+    def _GetSubstitutions(self, bundle_identifier, app_identifier_prefix):
+        """Constructs a dictionary of variable substitutions for Entitlements.plist.
+
+    Args:
+      bundle_identifier: string, value of CFBundleIdentifier from Info.plist
+      app_identifier_prefix: string, value for AppIdentifierPrefix
+
+    Returns:
+      Dictionary of substitutions to apply when generating Entitlements.plist.
+    """
+        return {
+            "CFBundleIdentifier": bundle_identifier,
+            "AppIdentifierPrefix": app_identifier_prefix,
+        }
+
+    def _GetCFBundleIdentifier(self):
+        """Extracts CFBundleIdentifier value from Info.plist in the bundle.
+
+    Returns:
+      Value of CFBundleIdentifier in the Info.plist located in the bundle.
+    """
+        info_plist_path = os.path.join(
+            os.environ["TARGET_BUILD_DIR"], os.environ["INFOPLIST_PATH"]
+        )
+        info_plist_data = self._LoadPlistMaybeBinary(info_plist_path)
+        return info_plist_data["CFBundleIdentifier"]
+
+    def _InstallEntitlements(self, entitlements, substitutions, overrides):
+        """Generates and install the ${BundleName}.xcent entitlements file.
+
+    Expands variables "$(variable)" pattern in the source entitlements file,
+    add extra entitlements defined in the .mobileprovision file and the copy
+    the generated plist to "${BundlePath}.xcent".
+
+    Args:
+      entitlements: string, optional, path to the Entitlements.plist template
+        to use, defaults to "${SDKROOT}/Entitlements.plist"
+      substitutions: dictionary, variable substitutions
+      overrides: dictionary, values to add to the entitlements
+
+    Returns:
+      Path to the generated entitlements file.
+    """
+        source_path = entitlements
+        target_path = os.path.join(
+            os.environ["BUILT_PRODUCTS_DIR"], os.environ["PRODUCT_NAME"] + ".xcent"
+        )
+        if not source_path:
+            source_path = os.path.join(os.environ["SDKROOT"], "Entitlements.plist")
+        shutil.copy2(source_path, target_path)
+        data = self._LoadPlistMaybeBinary(target_path)
+        data = self._ExpandVariables(data, substitutions)
+        if overrides:
+            for key in overrides:
+                if key not in data:
+                    data[key] = overrides[key]
+        plistlib.writePlist(data, target_path)
+        return target_path
+
+    def _ExpandVariables(self, data, substitutions):
+        """Expands variables "$(variable)" in data.
+
+    Args:
+      data: object, can be either string, list or dictionary
+      substitutions: dictionary, variable substitutions to perform
+
+    Returns:
+      Copy of data where each references to "$(variable)" has been replaced
+      by the corresponding value found in substitutions, or left intact if
+      the key was not found.
+    """
+        if isinstance(data, str):
+            for key, value in substitutions.items():
+                data = data.replace("$(%s)" % key, value)
+            return data
+        if isinstance(data, list):
+            return [self._ExpandVariables(v, substitutions) for v in data]
+        if isinstance(data, dict):
+            return {k: self._ExpandVariables(data[k], substitutions) for k in data}
+        return data
+
+
+def NextGreaterPowerOf2(x):
+    return 2 ** (x).bit_length()
+
+
+def WriteHmap(output_name, filelist):
+    """Generates a header map based on |filelist|.
+
+  Per Mark Mentovai:
+    A header map is structured essentially as a hash table, keyed by names used
+    in #includes, and providing pathnames to the actual files.
+
+  The implementation below and the comment above comes from inspecting:
+    http://www.opensource.apple.com/source/distcc/distcc-2503/distcc_dist/include_server/headermap.py?txt
+  while also looking at the implementation in clang in:
+    https://llvm.org/svn/llvm-project/cfe/trunk/lib/Lex/HeaderMap.cpp
+  """
+    magic = 1751998832
+    version = 1
+    _reserved = 0
+    count = len(filelist)
+    capacity = NextGreaterPowerOf2(count)
+    strings_offset = 24 + (12 * capacity)
+    max_value_length = max(len(value) for value in filelist.values())
+
+    out = open(output_name, "wb")
+    out.write(
+        struct.pack(
+            "<LHHLLLL",
+            magic,
+            version,
+            _reserved,
+            strings_offset,
+            count,
+            capacity,
+            max_value_length,
+        )
+    )
+
+    # Create empty hashmap buckets.
+    buckets = [None] * capacity
+    for file, path in filelist.items():
+        key = 0
+        for c in file:
+            key += ord(c.lower()) * 13
+
+        # Fill next empty bucket.
+        while buckets[key & capacity - 1] is not None:
+            key = key + 1
+        buckets[key & capacity - 1] = (file, path)
+
+    next_offset = 1
+    for bucket in buckets:
+        if bucket is None:
+            out.write(struct.pack("<LLL", 0, 0, 0))
+        else:
+            (file, path) = bucket
+            key_offset = next_offset
+            prefix_offset = key_offset + len(file) + 1
+            suffix_offset = prefix_offset + len(os.path.dirname(path) + os.sep) + 1
+            next_offset = suffix_offset + len(os.path.basename(path)) + 1
+            out.write(struct.pack("<LLL", key_offset, prefix_offset, suffix_offset))
+
+    # Pad byte since next offset starts at 1.
+    out.write(struct.pack("<x"))
+
+    for bucket in buckets:
+        if bucket is not None:
+            (file, path) = bucket
+            out.write(struct.pack("<%ds" % len(file), file))
+            out.write(struct.pack("<s", "\0"))
+            base = os.path.dirname(path) + os.sep
+            out.write(struct.pack("<%ds" % len(base), base))
+            out.write(struct.pack("<s", "\0"))
+            path = os.path.basename(path)
+            out.write(struct.pack("<%ds" % len(path), path))
+            out.write(struct.pack("<s", "\0"))
+
+
+if __name__ == "__main__":
+    sys.exit(main(sys.argv[1:]))