ScrapExplorer - Template.java
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[FILE BEGIN]
1package lab.decomplab.src;
2
3import java.io.*;
4import java.nio.*;
5import java.nio.charset.StandardCharsets;
6import java.nio.file.*;
7
8public class Template {
9
10    public class BinaryAsciiUtils {
11
12        public static String readAscii(ByteBuffer buf, int len) {
13            byte[] bytes = new byte[len];
14            buf.get(bytes);
15            return new String(bytes, StandardCharsets.US_ASCII);
16        }
17
18        public static String shortToAscii(short value) {
19            byte low = (byte) (value & 0xFF);
20            byte high = (byte) ((value >> 8) & 0xFF);
21            return new String(
22                new byte[] { low, high },
23                StandardCharsets.US_ASCII
24            );
25        }
26
27        public static String intToAscii(int value) {
28            byte b0 = (byte) (value & 0xFF);
29            byte b1 = (byte) ((value >> 8) & 0xFF);
30            byte b2 = (byte) ((value >> 16) & 0xFF);
31            byte b3 = (byte) ((value >> 24) & 0xFF);
32            return new String(
33                new byte[] { b0, b1, b2, b3 },
34                StandardCharsets.US_ASCII
35            );
36        }
37
38        public static String longToAscii(long value) {
39            byte b0 = (byte) (value & 0xFF);
40            byte b1 = (byte) ((value >> 8) & 0xFF);
41            byte b2 = (byte) ((value >> 16) & 0xFF);
42            byte b3 = (byte) ((value >> 24) & 0xFF);
43            byte b4 = (byte) ((value >> 32) & 0xFF);
44            byte b5 = (byte) ((value >> 40) & 0xFF);
45            byte b6 = (byte) ((value >> 48) & 0xFF);
46            byte b7 = (byte) ((value >> 56) & 0xFF);
47            return new String(
48                new byte[] { b0, b1, b2, b3, b4, b5, b6, b7 },
49                StandardCharsets.US_ASCII
50            );
51        }
52    }
53
54    static class HeaderA {
55
56        byte flag;
57        short version;
58        int dataSize;
59        long timestamp;
60
61        void read(ByteBuffer buf) {
62            flag = buf.get();
63            version = buf.getShort();
64            dataSize = buf.getInt();
65            timestamp = buf.getLong();
66        }
67
68        void print() {
69            System.out.println("HeaderA:");
70            System.out.println("  flag: " + flag);
71            System.out.println("  version: " + version);
72            System.out.println("  dataSize: " + dataSize);
73            System.out.println(
74                "  timestamp: " + BinaryAsciiUtils.longToAscii(timestamp)
75            );
76        }
77    }
78
79    static class HeaderB {
80
81        char label;
82        int count;
83        short mode;
84        byte active;
85
86        void read(ByteBuffer buf) {
87            label = (char) buf.get();
88            count = buf.getInt();
89            mode = buf.getShort();
90            active = buf.get();
91        }
92
93        void print() {
94            System.out.println("HeaderB:");
95            System.out.println("  label: " + label);
96            System.out.println("  count: " + count);
97            System.out.println("  mode: " + mode);
98            System.out.println("  active: " + active);
99        }
100    }
101
102    public static void main(String[] args) throws IOException {
103        if (args.length != 1) {
104            System.out.println("Usage: java Template <file>");
105            return;
106        }
107
108        byte[] data = Files.readAllBytes(Path.of(args[0]));
109        ByteBuffer buf = ByteBuffer.wrap(data).order(ByteOrder.LITTLE_ENDIAN);
110
111        HeaderA headA = new HeaderA();
112        headA.read(buf);
113        headA.print();
114
115        buf.position(buf.position() + 10);
116
117        HeaderB headB = new HeaderB();
118        headB.read(buf);
119        headB.print();
120    }
121}
122
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