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annotate src/luan/modules/BinaryLuan.java @ 1506:d80395468b4e

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ssl security in code
author Franklin Schmidt <fschmidt@gmail.com>
date Fri, 15 May 2020 18:29:47 -0600
parents e0cf0d108a77
children f7e2df85fc0a
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4c0131c2b650 merge luan/lib into modules
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1 package luan.modules;
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3 import java.io.UnsupportedEncodingException;
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4 import luan.Luan;
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5 import luan.LuanTable;
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6 import luan.LuanFunction;
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7 import luan.LuanException;
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ebe9db183eb7 rename *Lib.java to *Luan.java
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10 public final class BinaryLuan {
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12 static int start(byte[] binary,int i) {
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13 int len = binary.length;
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14 return i==0 ? 0 : i > 0 ? Math.min(i-1,len) : Math.max(len+i,0);
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15 }
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17 static int start(byte[] binary,Integer i,int dflt) {
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18 return i==null ? dflt : start(binary,i);
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19 }
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21 static int end(byte[] binary,int i) {
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22 int len = binary.length;
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23 return i==0 ? 0 : i > 0 ? Math.min(i,len) : Math.max(len+i+1,0);
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24 }
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26 static int end(byte[] binary,Integer i,int dflt) {
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27 return i==null ? dflt : end(binary,i);
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28 }
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30 public static Byte[] byte_(byte[] binary,Integer i,Integer j) throws LuanException {
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31 Utils.checkNotNull(binary);
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32 int start = start(binary,i,1);
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33 int end = end(binary,j,start+1);
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34 Byte[] bytes = new Byte[end-start];
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35 for( int k=0; k<bytes.length; k++ ) {
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36 bytes[k] = binary[start+k];
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37 }
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38 return bytes;
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39 }
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41 public static byte[] binary(byte... bytes) {
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42 return bytes;
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43 }
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45 private static String toString(byte[] a) {
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46 char[] ac = new char[a.length];
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47 for( int i=0; i<a.length; i++ ) {
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48 ac[i] = (char)a[i];
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49 }
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50 return new String(ac);
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51 }
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52
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53 public static String to_string(byte[] binary,String charsetName) throws LuanException, UnsupportedEncodingException {
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54 Utils.checkNotNull(binary);
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55 return charsetName!=null ? new String(binary,charsetName) : toString(binary);
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56 }
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58 }