Mercurial Hosting > luan
annotate src/luan/modules/BinaryLuan.java @ 1333:25746915a241
merge Luan and LuanState
author | Franklin Schmidt <fschmidt@gmail.com> |
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date | Tue, 12 Feb 2019 22:33:40 -0700 |
parents | e38f5869e9df |
children | e0cf0d108a77 |
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1 package luan.modules; |
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2 |
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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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8 import luan.LuanMethod; |
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9 |
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10 |
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11 public final class BinaryLuan { |
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12 |
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13 static int start(byte[] binary,int i) { |
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14 int len = binary.length; |
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15 return i==0 ? 0 : i > 0 ? Math.min(i-1,len) : Math.max(len+i,0); |
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16 } |
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17 |
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18 static int start(byte[] binary,Integer i,int dflt) { |
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19 return i==null ? dflt : start(binary,i); |
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20 } |
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21 |
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22 static int end(byte[] binary,int i) { |
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23 int len = binary.length; |
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24 return i==0 ? 0 : i > 0 ? Math.min(i,len) : Math.max(len+i+1,0); |
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25 } |
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26 |
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27 static int end(byte[] binary,Integer i,int dflt) { |
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28 return i==null ? dflt : end(binary,i); |
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29 } |
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30 |
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31 @LuanMethod public static Byte[] byte_(byte[] binary,Integer i,Integer j) throws LuanException { |
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32 Utils.checkNotNull(binary); |
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33 int start = start(binary,i,1); |
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34 int end = end(binary,j,start+1); |
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35 Byte[] bytes = new Byte[end-start]; |
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36 for( int k=0; k<bytes.length; k++ ) { |
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37 bytes[k] = binary[start+k]; |
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38 } |
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39 return bytes; |
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40 } |
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41 |
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42 @LuanMethod public static byte[] binary(byte... bytes) { |
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43 return bytes; |
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44 } |
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45 |
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46 private static String toString(byte[] a) { |
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47 char[] ac = new char[a.length]; |
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48 for( int i=0; i<a.length; i++ ) { |
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49 ac[i] = (char)a[i]; |
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50 } |
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51 return new String(ac); |
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52 } |
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53 |
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54 public static String to_string(byte[] binary,String charsetName) throws LuanException, UnsupportedEncodingException { |
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55 Utils.checkNotNull(binary); |
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56 return charsetName!=null ? new String(binary,charsetName) : toString(binary); |
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57 } |
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58 |
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59 } |