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1
4 package com.tc.util;
5
6 import com.tc.exception.TCRuntimeException;
7
8 import java.io.IOException  ;
9 import java.io.StringWriter ;
10 import java.io.Writer ;
11
12
15 public class HexDump {
16
17 private static final int BYTES_PER_LINE = 16;
18
19 public static String dump(byte[] data) {
20 return dump(data, 0, data.length);
21 }
22
23 public static String dump(byte[] data, int offset, int length) {
24 try {
25 StringWriter writer = new StringWriter ();
26 dump(data, offset, length, writer);
27 return writer.toString();
28 } catch (IOException ioe) {
29 throw new TCRuntimeException("How'd we get an IOException with an in-memory stream?", ioe);
30 }
31 }
32
33 public static void dump(byte[] data, Writer out) throws IOException {
34 dump(data, 0, data.length, out);
35 }
36
37 public static void dump(byte[] data, int offset, int length, Writer out) throws IOException {
38 Assert.assertNotNull(data);
39 Assert.assertNotNull(out);
40 Assert.eval(offset >= 0);
41 Assert.eval(offset + length <= data.length);
42 Assert.eval(length >= 0);
43
44 boolean multiline = length > BYTES_PER_LINE;
45 byte[] thisLine = new byte[BYTES_PER_LINE];
46
47 out.write(length + " byte" + (length == 1 ? "" : "s") + ":");
48 if (multiline) out.write("\n");
49 else out.write(" ");
50
51 int linePos = 0;
52 for (int i = 0; i < length; ++i) {
53 if (i % BYTES_PER_LINE == 0 && multiline) {
54 if (i != 0) out.write("\n");
55 out.write(padHex(i, 8) + ":");
56 linePos = 0;
57 }
58
59 byte b = data[offset + i];
60 thisLine[linePos++] = b;
61
62 if (i % 2 == 0 && (multiline || i != 0)) out.write(" ");
63 out.write(padHex((b & 0x000000FF), 2));
64
65 if (i == (length - 1)) {
66 int onLastLine = length - ((length / BYTES_PER_LINE) * BYTES_PER_LINE);
67 if (onLastLine == 0) onLastLine = BYTES_PER_LINE;
68 int remaining = BYTES_PER_LINE - onLastLine;
69
70 if (multiline) {
71 if (remaining == 0) out.write(" ");
72 if (remaining % 2 != 0) {
73 out.write(" ");
74 remaining--;
75 }
76
77 Assert.eval(remaining % 2 == 0);
78
79 while (remaining > 0) {
80 out.write(" ");
81 remaining -= 2;
82 }
83
84 out.write(" ");
85 } else {
86 out.write(" ");
87 }
88
89 for (int j = 0; j < onLastLine; ++j) {
90 out.write(getChar(thisLine[j]));
91 }
92
93 if (multiline) out.write("\n");
94 } else if ((i + 1) % BYTES_PER_LINE == 0 && i != 0) {
95 out.write(" ");
96 for (int j = 0; j < thisLine.length; ++j) {
97 out.write(getChar(thisLine[j]));
98 }
99 }
100 }
101 }
102
103
106 public static String rawHexDump(byte[] data) {
107 StringBuffer hexDump = new StringBuffer ();
108 for (int pos = 0; pos < data.length; ++pos)
109 hexDump.append(padHex(0xff & data[pos], 2));
110 return hexDump.toString();
111 }
112
113 private static char getChar(byte b) {
114 int val = b & 0x000000FF;
115 if (val < 0x20 || val > 0x7E) return '.';
116 else return (char) b;
117 }
118
119 private static String padHex(int num, int totalLength) {
120 String out = Integer.toHexString(num);
121 while (out.length() < totalLength) {
122 out = "0" + out;
123 }
124 return out;
125 }
126
127 } |
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