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1 | | -/** |
2 | | - * Copyright 2012 Kamran Zafar |
3 | | - * |
4 | | - * Licensed under the Apache License, Version 2.0 (the "License"); |
5 | | - * you may not use this file except in compliance with the License. |
6 | | - * You may obtain a copy of the License at |
7 | | - * |
8 | | - * http://www.apache.org/licenses/LICENSE-2.0 |
9 | | - * |
10 | | - * Unless required by applicable law or agreed to in writing, software |
11 | | - * distributed under the License is distributed on an "AS IS" BASIS, |
12 | | - * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
13 | | - * See the License for the specific language governing permissions and |
14 | | - * limitations under the License. |
15 | | - * |
16 | | - */ |
17 | | - |
18 | | -package org.kamranzafar.jtar; |
19 | | - |
20 | | -/** |
21 | | - * @author Kamran Zafar |
22 | | - * |
23 | | - */ |
24 | | -public class Octal { |
25 | | - |
26 | | - /** |
27 | | - * Parse an octal string from a header buffer. This is used for the file |
28 | | - * permission mode value. |
29 | | - * |
30 | | - * @param header |
31 | | - * The header buffer from which to parse. |
32 | | - * @param offset |
33 | | - * The offset into the buffer from which to parse. |
34 | | - * @param length |
35 | | - * The number of header bytes to parse. |
36 | | - * |
37 | | - * @return The long value of the octal string. |
38 | | - */ |
39 | | - public static long parseOctal(byte[] header, int offset, int length) { |
40 | | - long result = 0; |
41 | | - boolean stillPadding = true; |
42 | | - |
43 | | - int end = offset + length; |
44 | | - for (int i = offset; i < end; ++i) { |
45 | | - if (header[i] == 0) |
46 | | - break; |
47 | | - |
48 | | - if (header[i] == (byte) ' ' || header[i] == '0') { |
49 | | - if (stillPadding) |
50 | | - continue; |
51 | | - |
52 | | - if (header[i] == (byte) ' ') |
53 | | - break; |
54 | | - } |
55 | | - |
56 | | - stillPadding = false; |
57 | | - |
58 | | - result = ( result << 3 ) + ( header[i] - '0' ); |
59 | | - } |
60 | | - |
61 | | - return result; |
62 | | - } |
63 | | - |
64 | | - /** |
65 | | - * Parse an octal integer from a header buffer. |
66 | | - * |
67 | | - * @param value |
68 | | - * @param buf |
69 | | - * The header buffer from which to parse. |
70 | | - * @param offset |
71 | | - * The offset into the buffer from which to parse. |
72 | | - * @param length |
73 | | - * The number of header bytes to parse. |
74 | | - * |
75 | | - * @return The integer value of the octal bytes. |
76 | | - */ |
77 | | - public static int getOctalBytes(long value, byte[] buf, int offset, int length) { |
78 | | - int idx = length - 1; |
79 | | - |
80 | | - buf[offset + idx] = 0; |
81 | | - --idx; |
82 | | - buf[offset + idx] = (byte) ' '; |
83 | | - --idx; |
84 | | - |
85 | | - if (value == 0) { |
86 | | - buf[offset + idx] = (byte) '0'; |
87 | | - --idx; |
88 | | - } else { |
89 | | - for (long val = value; idx >= 0 && val > 0; --idx) { |
90 | | - buf[offset + idx] = (byte) ( (byte) '0' + (byte) ( val & 7 ) ); |
91 | | - val = val >> 3; |
92 | | - } |
93 | | - } |
94 | | - |
95 | | - for (; idx >= 0; --idx) { |
96 | | - buf[offset + idx] = (byte) ' '; |
97 | | - } |
98 | | - |
99 | | - return offset + length; |
100 | | - } |
101 | | - |
102 | | - /** |
103 | | - * Parse the checksum octal integer from a header buffer. |
104 | | - * |
105 | | - * @param value |
106 | | - * @param buf |
107 | | - * The header buffer from which to parse. |
108 | | - * @param offset |
109 | | - * The offset into the buffer from which to parse. |
110 | | - * @param length |
111 | | - * The number of header bytes to parse. |
112 | | - * @return The integer value of the entry's checksum. |
113 | | - */ |
114 | | - public static int getCheckSumOctalBytes(long value, byte[] buf, int offset, int length) { |
115 | | - getOctalBytes( value, buf, offset, length ); |
116 | | - buf[offset + length - 1] = (byte) ' '; |
117 | | - buf[offset + length - 2] = 0; |
118 | | - return offset + length; |
119 | | - } |
120 | | - |
121 | | - /** |
122 | | - * Parse an octal long integer from a header buffer. |
123 | | - * |
124 | | - * @param value |
125 | | - * @param buf |
126 | | - * The header buffer from which to parse. |
127 | | - * @param offset |
128 | | - * The offset into the buffer from which to parse. |
129 | | - * @param length |
130 | | - * The number of header bytes to parse. |
131 | | - * |
132 | | - * @return The long value of the octal bytes. |
133 | | - */ |
134 | | - public static int getLongOctalBytes(long value, byte[] buf, int offset, int length) { |
135 | | - byte[] temp = new byte[length + 1]; |
136 | | - getOctalBytes( value, temp, 0, length + 1 ); |
137 | | - System.arraycopy( temp, 0, buf, offset, length ); |
138 | | - return offset + length; |
139 | | - } |
140 | | - |
141 | | -} |
| 1 | +/** |
| 2 | + * Copyright 2012 Kamran Zafar |
| 3 | + * |
| 4 | + * Licensed under the Apache License, Version 2.0 (the "License"); |
| 5 | + * you may not use this file except in compliance with the License. |
| 6 | + * You may obtain a copy of the License at |
| 7 | + * |
| 8 | + * http://www.apache.org/licenses/LICENSE-2.0 |
| 9 | + * |
| 10 | + * Unless required by applicable law or agreed to in writing, software |
| 11 | + * distributed under the License is distributed on an "AS IS" BASIS, |
| 12 | + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 13 | + * See the License for the specific language governing permissions and |
| 14 | + * limitations under the License. |
| 15 | + * |
| 16 | + */ |
| 17 | + |
| 18 | +package org.kamranzafar.jtar; |
| 19 | + |
| 20 | +/** |
| 21 | + * @author Kamran Zafar |
| 22 | + * |
| 23 | + */ |
| 24 | +public class Octal { |
| 25 | + |
| 26 | + /** |
| 27 | + * Parse an octal string from a header buffer. This is used for the file |
| 28 | + * permission mode value. |
| 29 | + * |
| 30 | + * @param header |
| 31 | + * The header buffer from which to parse. |
| 32 | + * @param offset |
| 33 | + * The offset into the buffer from which to parse. |
| 34 | + * @param length |
| 35 | + * The number of header bytes to parse. |
| 36 | + * |
| 37 | + * @return The long value of the octal string. |
| 38 | + */ |
| 39 | + public static long parseOctal(byte[] header, int offset, int length) { |
| 40 | + long result = 0; |
| 41 | + boolean stillPadding = true; |
| 42 | + |
| 43 | + int end = offset + length; |
| 44 | + for (int i = offset; i < end; ++i) { |
| 45 | + if (header[i] == 0) |
| 46 | + break; |
| 47 | + |
| 48 | + if (header[i] == (byte) ' ' || header[i] == '0') { |
| 49 | + if (stillPadding) |
| 50 | + continue; |
| 51 | + |
| 52 | + if (header[i] == (byte) ' ') |
| 53 | + break; |
| 54 | + } |
| 55 | + |
| 56 | + stillPadding = false; |
| 57 | + |
| 58 | + result = ( result << 3 ) + ( header[i] - '0' ); |
| 59 | + } |
| 60 | + |
| 61 | + return result; |
| 62 | + } |
| 63 | + |
| 64 | + /** |
| 65 | + * Parse an octal integer from a header buffer. |
| 66 | + * |
| 67 | + * @param value |
| 68 | + * @param buf |
| 69 | + * The header buffer from which to parse. |
| 70 | + * @param offset |
| 71 | + * The offset into the buffer from which to parse. |
| 72 | + * @param length |
| 73 | + * The number of header bytes to parse. |
| 74 | + * |
| 75 | + * @return The integer value of the octal bytes. |
| 76 | + */ |
| 77 | + public static int getOctalBytes(long value, byte[] buf, int offset, int length) { |
| 78 | + int idx = length - 1; |
| 79 | + |
| 80 | + buf[offset + idx] = 0; |
| 81 | + --idx; |
| 82 | + buf[offset + idx] = (byte) ' '; |
| 83 | + --idx; |
| 84 | + |
| 85 | + if (value == 0) { |
| 86 | + buf[offset + idx] = (byte) '0'; |
| 87 | + --idx; |
| 88 | + } else { |
| 89 | + for (long val = value; idx >= 0 && val > 0; --idx) { |
| 90 | + buf[offset + idx] = (byte) ( (byte) '0' + (byte) ( val & 7 ) ); |
| 91 | + val = val >> 3; |
| 92 | + } |
| 93 | + } |
| 94 | + |
| 95 | + for (; idx >= 0; --idx) { |
| 96 | + buf[offset + idx] = (byte) ' '; |
| 97 | + } |
| 98 | + |
| 99 | + return offset + length; |
| 100 | + } |
| 101 | + |
| 102 | + /** |
| 103 | + * Parse the checksum octal integer from a header buffer. |
| 104 | + * |
| 105 | + * @param value |
| 106 | + * @param buf |
| 107 | + * The header buffer from which to parse. |
| 108 | + * @param offset |
| 109 | + * The offset into the buffer from which to parse. |
| 110 | + * @param length |
| 111 | + * The number of header bytes to parse. |
| 112 | + * @return The integer value of the entry's checksum. |
| 113 | + */ |
| 114 | + public static int getCheckSumOctalBytes(long value, byte[] buf, int offset, int length) { |
| 115 | + getOctalBytes( value, buf, offset, length ); |
| 116 | + buf[offset + length - 1] = (byte) ' '; |
| 117 | + buf[offset + length - 2] = 0; |
| 118 | + return offset + length; |
| 119 | + } |
| 120 | + |
| 121 | + /** |
| 122 | + * Parse an octal long integer from a header buffer. |
| 123 | + * |
| 124 | + * @param value |
| 125 | + * @param buf |
| 126 | + * The header buffer from which to parse. |
| 127 | + * @param offset |
| 128 | + * The offset into the buffer from which to parse. |
| 129 | + * @param length |
| 130 | + * The number of header bytes to parse. |
| 131 | + * |
| 132 | + * @return The long value of the octal bytes. |
| 133 | + */ |
| 134 | + public static int getLongOctalBytes(long value, byte[] buf, int offset, int length) { |
| 135 | + byte[] temp = new byte[length + 1]; |
| 136 | + getOctalBytes( value, temp, 0, length + 1 ); |
| 137 | + System.arraycopy( temp, 0, buf, offset, length ); |
| 138 | + return offset + length; |
| 139 | + } |
| 140 | + |
| 141 | +} |
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