1/* Copyright (C) 1995-2021 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, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <stdlib.h>
20
21#define TABLE_BASE 0x2e
22#define TABLE_SIZE 0x4d
23
24#define XX ((char)0x40)
25
26
27static const char a64l_table[TABLE_SIZE] =
28{
29 /* 0x2e */ 0, 1,
30 /* 0x30 */ 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, XX, XX, XX, XX, XX, XX,
31 /* 0x40 */ XX, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26,
32 /* 0x50 */ 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, XX, XX, XX, XX, XX,
33 /* 0x60 */ XX, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52,
34 /* 0x70 */ 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63
35};
36
37
38long int
39a64l (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}
65