Converts between long integers and base-64 ASCII strings.
Standard C Library (libc.a)
The a64l and l64a subroutines maintain numbers stored in base-64 ASCII characters. This is a notation in which long integers are represented by up to 6 characters, each character representing a digit in a base-64 notation.
The following characters are used to represent digits:
| Character | Description |
|---|---|
| . | Represents 0. |
| / | Represents 1. |
| 0 -9 | Represents the numbers 2-11. |
| A-Z | Represents the numbers 12-37. |
| a-z | Represents the numbers 38-63. |
| Item | Description |
|---|---|
| String | Specifies the address of a null-terminated character string. |
| LongInteger | Specifies a long value to convert. |
The a64l subroutine takes a pointer to a null-terminated character string containing a value in base-64 representation and returns the corresponding long value. If the string pointed to by the String parameter contains more than 6 characters, the a64l subroutine uses only the first 6.
Conversely, the l64a subroutine takes a long parameter and returns a pointer to the corresponding base-64 representation. If the LongInteger parameter is a value of 0, the l64a subroutine returns a pointer to a null string.
The value returned by the l64a subroutine is a pointer into a static buffer, the contents of which are overwritten by each call.
If the *String parameter is a null string, the a64l subroutine returns a value of 0L.
If LongInteger is 0L, the l64a subroutine returns a pointer to a null string.