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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -1,77 +1,17 @@ | ||
| package featurecat.lizzie; | ||
|
|
||
| import java.io.*; | ||
| import java.net.URL; | ||
| import java.nio.channels.Channels; | ||
| import java.nio.channels.ReadableByteChannel; | ||
| import java.security.DigestInputStream; | ||
| import java.security.MessageDigest; | ||
| import java.security.NoSuchAlgorithmException; | ||
| import java.util.stream.Collectors; | ||
| import java.util.zip.GZIPInputStream; | ||
|
|
||
| public class Util { | ||
| /** | ||
| * @param val the value we want to clamp | ||
| * @param min the minimum value that will be returned | ||
| * @param max the maximum value that will be returned | ||
| * @return the closest number to val within the range [min, max] | ||
| */ | ||
| public static <T extends Comparable<T>> T clamp(T val, T min, T max) { | ||
| if (val.compareTo(min) < 0) return min; | ||
| else if (val.compareTo(max) > 0) return max; | ||
| else return val; | ||
| } | ||
|
|
||
| /** @return the sha 256 checksum of decompressed contents from a GZIPed file */ | ||
| public static String getSha256Sum(File file) { | ||
| try (InputStream inputStream = new GZIPInputStream(new FileInputStream(file))) { | ||
| MessageDigest messageDigest = MessageDigest.getInstance("SHA-256"); | ||
| DigestInputStream digestInputStream = new DigestInputStream(inputStream, messageDigest); | ||
|
|
||
| // we have to read the file. additionally, using a buffer is efficient. | ||
| // 8192 was tested as the best value among 4096, 8192, 16384, and 32768. | ||
| byte[] buffer = new byte[8192]; | ||
| while (digestInputStream.read(buffer) != -1) ; | ||
|
|
||
| MessageDigest digest = digestInputStream.getMessageDigest(); | ||
| digestInputStream.close(); | ||
|
|
||
| byte[] sha256 = digest.digest(); | ||
| StringBuilder sb = new StringBuilder(); | ||
| for (byte b : sha256) { | ||
| sb.append(String.format("%02X", b)); | ||
| } | ||
| return sb.toString().toLowerCase(); | ||
| } catch (NoSuchAlgorithmException e) { | ||
| e.printStackTrace(); | ||
| } catch (EOFException e) { | ||
| // do nothing, just means we need to download a new one | ||
| } catch (IOException e) { | ||
| e.printStackTrace(); | ||
| } | ||
| return null; | ||
| } | ||
|
|
||
| /** @return the url's contents, downloaded as a string */ | ||
| public static String downloadAsString(URL url) { | ||
| try (BufferedReader br = new BufferedReader(new InputStreamReader(url.openStream()))) { | ||
| return br.lines().collect(Collectors.joining("\n")); | ||
| } catch (IOException e) { | ||
| e.printStackTrace(); | ||
| } | ||
|
|
||
| return null; | ||
| } | ||
|
|
||
| /** Downloads the contents of the url, and saves them in a file. */ | ||
| public static void saveAsFile(URL url, File file) { | ||
| try { | ||
| ReadableByteChannel rbc = Channels.newChannel(url.openStream()); | ||
| FileOutputStream fos = new FileOutputStream(file); | ||
| fos.getChannel().transferFrom(rbc, 0, Long.MAX_VALUE); | ||
| } catch (IOException e) { | ||
| e.printStackTrace(); | ||
| } | ||
| } | ||
| } | ||
| // package featurecat.lizzie; | ||
|
|
||
| // import java.io.*; | ||
|
|
||
| // public class Util { | ||
| // /** | ||
| // * @param val the value we want to clamp | ||
| // * @param min the minimum value that will be returned | ||
| // * @param max the maximum value that will be returned | ||
| // * @return the closest number to val within the range [min, max] | ||
| // */ | ||
| // public static <T extends Comparable<T>> T clamp(T val, T min, T max) { | ||
| // if (val.compareTo(min) < 0) return min; | ||
| // else if (val.compareTo(max) > 0) return max; | ||
| // else return val; | ||
| // } | ||
| // } |
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