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import argparse
import re
from fractions import Fraction

SPEED_OF_LIGHT = 300000000  # meters/second


class Frequency:
    """
    Converts given frequency to Hertz (Hz)

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SDK_VERSION=$1
SDK_NAME="MacOSX${SDK_VERSION}.sdk"
TAR_FILE_NAME="${SDK_NAME}.tar.xz"
DOWNLOAD_URL="https://github.com/phracker/MacOSX-SDKs/releases/download/MacOSX10.11.sdk/${TAR_FILE_NAME}"
TAR_FILE_DEST="/tmp/${TAR_FILE_NAME}"
SDK_MIN_VERSION_FILE="/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Info.plist"
SDK_DIR="/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/"

echo Downloading $SDK_NAME
curl -L $DOWNLOAD_URL -o $TAR_FILE_DEST --progress-bar

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DESTINATION_FILE="/Users/$(id -un)/Library/Application Support/Wineskin/Wrapper/Wineskin-2.6.2.app/Wineskin.app/Contents/Resources/winetricks"
curl https://raw.githubusercontent.com/Winetricks/winetricks/master/files/LATEST \
    -o $DESTINATION_FILE \
    && chmod +x $DESTINATION_FILE

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# W2.5.5v1EngineBase

1) put sdk 10.8 into the /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs
2) change MinimumSDKVersion at /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Info.plist to 10.8
3) update WineskinEngineBuilder's dependencies at /Users/<username>/Library/Application Support/Wineskin/EngineBase/W2.5.5v1EngineBase
libxml2 -> libxml2
libpng14 -> libpng16

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derkey = Popen(['openssl', 'rsa', '-pubout', '-outform', 'DER', '-inform',
                'PEM', '-in', path_to_pem_key], stdout=PIPE).stdout.read()
signature = Popen(['openssl', 'sha1', '-sha1', '-sign', path_to_pem_key,
                   zip_file.filename], stdout=PIPE).stdout.read()
with open('extension.crx', 'w') as crx:
    crx.writelines(['Cr24',
                    struct.pack("<I", 2),  # crx version
                    struct.pack("<I", len(derkey)),
                    struct.pack("<I", len(signature)),
                    derkey,

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show () {
    if [ $(defaults read com.apple.finder AppleShowAllFiles) == NO ]; then
        SHOW=YES
    else
        SHOW=NO
    fi
    defaults write com.apple.finder AppleShowAllFiles $SHOW
    kill -1 `ps aucx | grep Finder | awk '{print $2}'` 
}