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- #include <stdlib.h>
- #define TABLE_BASE 0x2e
- #define TABLE_SIZE 0x4d
- #define XX ((char)0x40)
- static const char a64l_table[TABLE_SIZE] =
- {
- 0, 1,
- 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, XX, XX, XX, XX, XX, XX,
- XX, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26,
- 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, XX, XX, XX, XX, XX,
- XX, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52,
- 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63
- };
- long int
- a64l (string)
- const char *string;
- {
- const char *ptr = string;
- unsigned long int result = 0ul;
- const char *end = ptr + 6;
- int shift = 0;
- do
- {
- unsigned index;
- unsigned value;
- index = *ptr - TABLE_BASE;
- if ((unsigned int) index >= TABLE_SIZE)
- break;
- value = (int) a64l_table[index];
- if (value == (int) XX)
- break;
- ++ptr;
- result |= value << shift;
- shift += 6;
- }
- while (ptr != end);
- return (long int) result;
- }
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