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2b778ceb | 1 | /* Copyright (C) 1995-2021 Free Software Foundation, Inc. |
7cc27f44 | 2 | This file is part of the GNU C Library. |
60478656 | 3 | |
7cc27f44 | 4 | The GNU C Library is free software; you can redistribute it and/or |
41bdb6e2 AJ |
5 | modify it under the terms of the GNU Lesser General Public |
6 | License as published by the Free Software Foundation; either | |
7 | version 2.1 of the License, or (at your option) any later version. | |
60478656 | 8 | |
7cc27f44 UD |
9 | The GNU C Library is distributed in the hope that it will be useful, |
10 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
41bdb6e2 | 12 | Lesser General Public License for more details. |
60478656 | 13 | |
41bdb6e2 | 14 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 | 15 | License along with the GNU C Library; if not, see |
5a82c748 | 16 | <https://www.gnu.org/licenses/>. */ |
60478656 RM |
17 | |
18 | #include <stdlib.h> | |
19 | ||
c4563d2d UD |
20 | #define TABLE_BASE 0x2e |
21 | #define TABLE_SIZE 0x4d | |
ae828bc6 UD |
22 | |
23 | #define XX ((char)0x40) | |
24 | ||
25 | ||
26 | static const char a64l_table[TABLE_SIZE] = | |
27 | { | |
c4563d2d | 28 | /* 0x2e */ 0, 1, |
ae828bc6 UD |
29 | /* 0x30 */ 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, XX, XX, XX, XX, XX, XX, |
30 | /* 0x40 */ XX, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, | |
31 | /* 0x50 */ 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, XX, XX, XX, XX, XX, | |
32 | /* 0x60 */ XX, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, | |
c4563d2d | 33 | /* 0x70 */ 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63 |
ae828bc6 UD |
34 | }; |
35 | ||
36 | ||
b4012b75 | 37 | long int |
9d46370c | 38 | a64l (const char *string) |
60478656 | 39 | { |
ae828bc6 UD |
40 | const char *ptr = string; |
41 | unsigned long int result = 0ul; | |
42 | const char *end = ptr + 6; | |
ab1c32a6 | 43 | int shift = 0; |
60478656 | 44 | |
ae828bc6 | 45 | do |
60478656 | 46 | { |
ae828bc6 UD |
47 | unsigned index; |
48 | unsigned value; | |
49 | ||
50 | index = *ptr - TABLE_BASE; | |
51 | if ((unsigned int) index >= TABLE_SIZE) | |
52 | break; | |
53 | value = (int) a64l_table[index]; | |
54 | if (value == (int) XX) | |
55 | break; | |
ae828bc6 | 56 | ++ptr; |
ab1c32a6 AS |
57 | result |= value << shift; |
58 | shift += 6; | |
60478656 | 59 | } |
ae828bc6 | 60 | while (ptr != end); |
60478656 | 61 | |
dd7d45e8 | 62 | return (long int) result; |
60478656 | 63 | } |