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1 | /*
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2 | * Check
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3 | *
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4 | * Author: Lasse Collin <lasse.collin@tukaani.org>
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5 | *
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6 | * This file has been put into the public domain.
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7 | * You can do whatever you want with this file.
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8 | */
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9 |
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10 | package org.tukaani.xz.check;
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11 |
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12 | import org.tukaani.xz.XZ;
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13 | import org.tukaani.xz.UnsupportedOptionsException;
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14 |
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15 | public abstract class Check {
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16 | int size;
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17 | String name;
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18 |
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19 | public abstract void update(byte[] buf, int off, int len);
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20 | public abstract byte[] finish();
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21 |
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22 | public void update(byte[] buf) {
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23 | update(buf, 0, buf.length);
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24 | }
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25 |
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26 | public int getSize() {
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27 | return size;
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28 | }
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29 |
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30 | public String getName() {
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31 | return name;
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32 | }
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33 |
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34 | public static Check getInstance(int checkType)
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35 | throws UnsupportedOptionsException {
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36 | switch (checkType) {
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37 | case XZ.CHECK_NONE:
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38 | return new None();
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39 |
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40 | case XZ.CHECK_CRC32:
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41 | return new CRC32();
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42 |
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43 | case XZ.CHECK_CRC64:
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44 | return new CRC64();
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45 |
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46 | case XZ.CHECK_SHA256:
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47 | try {
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48 | return new SHA256();
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49 | } catch (java.security.NoSuchAlgorithmException e) {}
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50 |
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51 | break;
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52 | }
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53 |
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54 | throw new UnsupportedOptionsException(
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55 | "Unsupported Check ID " + checkType);
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56 | }
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57 | }
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