[152] | 1 | package solarsim.io; |
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| 2 | |
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| 3 | import solarsim.common.Vector; |
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| 4 | import java.io.IOException; |
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| 5 | import java.io.InputStream; |
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| 6 | |
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| 7 | /** |
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| 8 | * Clasa Wrapper pentru InputStream care permite citirea de valori care au fost scrise de programul in C |
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| 9 | * @author Marius Ion |
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| 10 | */ |
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| 11 | public class MyInputStreamReader { |
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| 12 | |
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| 13 | private InputStream in; |
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| 14 | |
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| 15 | public MyInputStreamReader(InputStream in) { |
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| 16 | this.in = in; |
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| 17 | } |
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| 18 | |
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| 19 | /** |
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| 20 | * Citeste un double scris in binar (8 octeti) din streamul de intrare |
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| 21 | * @return numarul citit citit |
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| 22 | * @throws IOException cand s-a produs o eroare la citirea din InputStream-ul incapsulat |
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| 23 | */ |
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| 24 | public double readDouble() throws IOException { |
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| 25 | byte [] buf = new byte[8]; |
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| 26 | while( in.available() < 8 ) |
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| 27 | try { |
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| 28 | Thread.currentThread().sleep(1000); |
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| 29 | } catch (InterruptedException ex) {} |
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| 30 | in.read(buf, 0, 8); |
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| 31 | return arr2double(buf, 0); |
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| 32 | } |
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| 33 | |
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| 34 | /** |
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| 35 | * Citeste un float scris in binar (4 octeti) din streamul de intrare |
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| 36 | * @return numarul citit citit |
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| 37 | * @throws IOException cand s-a produs o eroare la citirea din InputStream-ul incapsulat |
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| 38 | */ |
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| 39 | public double readFloat() throws IOException { |
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| 40 | byte [] buf = new byte[4]; |
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| 41 | while( in.available() < 4 ) |
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| 42 | try { |
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| 43 | Thread.currentThread().sleep(1000); |
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| 44 | } catch (InterruptedException ex) {} |
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| 45 | in.read(buf, 0, 4); |
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| 46 | return arr2float(buf, 0); |
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| 47 | } |
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| 48 | |
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| 49 | /** |
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| 50 | * Citeste un int scris in binar (4 octeti) din streamul de intrare |
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| 51 | * @return numarul citit |
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| 52 | * @throws IOException cand s-a produs o eroare la citirea din InputStream-ul incapsulat |
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| 53 | */ |
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| 54 | public int readInt() throws IOException { |
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| 55 | byte [] buf = new byte[4]; |
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| 56 | while( in.available() < 4 ) |
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| 57 | try { |
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| 58 | Thread.currentThread().sleep(1000); |
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| 59 | } catch (InterruptedException ex) {} |
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| 60 | in.read(buf, 0, 4); |
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| 61 | return arr2int(buf); |
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| 62 | } |
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| 63 | |
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| 64 | /** |
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| 65 | * Citeste un Vector scris in binar (3 double) din streamul de intrare |
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| 66 | * @return Vectorul citit |
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| 67 | * @throws IOException cand s-a produs o eroare la citirea din InputStream-ul incapsulat |
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| 68 | */ |
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| 69 | public Vector readVector() throws IOException { |
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| 70 | Vector v = new Vector(); |
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| 71 | v.x = readDouble(); |
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| 72 | v.y = readDouble(); |
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| 73 | v.z = readDouble(); |
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| 74 | readDouble(); |
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| 75 | return v; |
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| 76 | } |
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| 77 | |
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| 78 | /** |
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| 79 | * Citeste un Vector scris in binar (3 float) din streamul de intrare |
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| 80 | * @return Vectorul citit |
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| 81 | * @throws IOException cand s-a produs o eroare la citirea din InputStream-ul incapsulat |
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| 82 | */ |
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| 83 | public Vector readFloatVector() throws IOException { |
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| 84 | Vector v = new Vector(); |
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| 85 | v.x = (double)readFloat(); |
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| 86 | v.y = (double)readFloat(); |
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| 87 | v.z = (double)readFloat(); |
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| 88 | readFloat(); |
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| 89 | return v; |
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| 90 | } |
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| 91 | |
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| 92 | private int arr2int (byte[] arr) { |
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| 93 | int i = 0; |
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| 94 | int len = 4; |
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| 95 | int cnt = 0; |
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| 96 | byte[] tmp = new byte[len]; |
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| 97 | for (i = 0; i < len; i++) { |
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| 98 | tmp[cnt] = arr[i]; |
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| 99 | cnt++; |
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| 100 | } |
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| 101 | int accum = 0; |
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| 102 | i = 0; |
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| 103 | for ( int shiftBy = 0; shiftBy < 32; shiftBy += 8 ) { |
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| 104 | accum |= ( (int)( tmp[i] & 0xff ) ) << shiftBy; |
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| 105 | i++; |
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| 106 | } |
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| 107 | return accum; |
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| 108 | } |
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| 109 | |
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| 110 | private double arr2float (byte[] arr, int start) { |
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| 111 | int i = 0; |
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| 112 | int len = 4; |
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| 113 | int cnt = 0; |
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| 114 | byte[] tmp = new byte[len]; |
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| 115 | for (i = start; i < (start + len); i++) { |
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| 116 | tmp[cnt] = arr[i]; |
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| 117 | cnt++; |
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| 118 | } |
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| 119 | int accum = 0; |
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| 120 | i = 0; |
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| 121 | for ( int shiftBy = 0; shiftBy < 32; shiftBy += 8 ) { |
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| 122 | accum |= ( (long)( tmp[i] & 0xff ) ) << shiftBy; |
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| 123 | i++; |
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| 124 | } |
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| 125 | return Float.intBitsToFloat(accum); |
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| 126 | } |
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| 127 | |
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| 128 | private double arr2double (byte[] arr, int start) { |
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| 129 | int i = 0; |
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| 130 | int len = 8; |
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| 131 | int cnt = 0; |
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| 132 | byte[] tmp = new byte[len]; |
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| 133 | for (i = start; i < (start + len); i++) { |
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| 134 | tmp[cnt] = arr[i]; |
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| 135 | cnt++; |
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| 136 | } |
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| 137 | long accum = 0; |
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| 138 | i = 0; |
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| 139 | for ( int shiftBy = 0; shiftBy < 64; shiftBy += 8 ) { |
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| 140 | accum |= ( (long)( tmp[i] & 0xff ) ) << shiftBy; |
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| 141 | i++; |
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| 142 | } |
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| 143 | return Double.longBitsToDouble(accum); |
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| 144 | } |
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| 145 | |
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| 146 | } |
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