| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame^] | 1 | /* Copyright (C) 1995, 1997, 1998, 1999 Free Software Foundation, Inc. |
| 2 | This file is part of the GNU C Library. |
| 3 | Contributed by Ulrich Drepper <drepper@gnu.org>, August 1995. |
| 4 | |
| 5 | The GNU C Library is free software; you can redistribute it and/or |
| 6 | modify it under the terms of the GNU Lesser General Public |
| 7 | License as published by the Free Software Foundation; either |
| 8 | version 2.1 of the License, or (at your option) any later version. |
| 9 | |
| 10 | The GNU C Library is distributed in the hope that it will be useful, |
| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 13 | Lesser General Public License for more details. |
| 14 | |
| 15 | You should have received a copy of the GNU Lesser General Public |
| 16 | License along with the GNU C Library; if not, write to the Free |
| 17 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 18 | 02111-1307 USA. */ |
| 19 | |
| 20 | #include <stdlib.h> |
| 21 | |
| 22 | #define TABLE_BASE 0x2e |
| 23 | #define TABLE_SIZE 0x4d |
| 24 | |
| 25 | #define XX ((char)0x40) |
| 26 | |
| 27 | |
| 28 | static const char a64l_table[TABLE_SIZE] = |
| 29 | { |
| 30 | /* 0x2e */ 0, 1, |
| 31 | /* 0x30 */ 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, XX, XX, XX, XX, XX, XX, |
| 32 | /* 0x40 */ XX, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, |
| 33 | /* 0x50 */ 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, XX, XX, XX, XX, XX, |
| 34 | /* 0x60 */ XX, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, |
| 35 | /* 0x70 */ 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63 |
| 36 | }; |
| 37 | |
| 38 | |
| 39 | long int a64l (const char *string) |
| 40 | { |
| 41 | const char *ptr = string; |
| 42 | unsigned long int result = 0ul; |
| 43 | const char *end = ptr + 6; |
| 44 | int shift = 0; |
| 45 | |
| 46 | do |
| 47 | { |
| 48 | unsigned index; |
| 49 | unsigned value; |
| 50 | |
| 51 | index = *ptr - TABLE_BASE; |
| 52 | if ((unsigned int) index >= TABLE_SIZE) |
| 53 | break; |
| 54 | value = (int) a64l_table[index]; |
| 55 | if (value == (int) XX) |
| 56 | break; |
| 57 | ++ptr; |
| 58 | result |= value << shift; |
| 59 | shift += 6; |
| 60 | } |
| 61 | while (ptr != end); |
| 62 | |
| 63 | return (long int) result; |
| 64 | } |