[hcoop/debian/openafs.git] / src / util / base64.c

/*
 * Copyright 2000, International Business Machines Corporation and others.
 * All Rights Reserved.
 *
 * This software has been released under the terms of the IBM Public
 * License.  For details, see the LICENSE file in the top-level source
 * directory or online at http://www.openafs.org/dl/license10.html
 */

#include <afsconfig.h>
#include <afs/param.h>


#ifdef AFS_SGI_XFS_IOPS_ENV

static char c_xlate[80] =
    "+,0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

/* int_to_base64
 * Create a base 64 string representation of a number.
 * The supplied string 's' must be at least 8 bytes long.
 * b64_string in stds.h provides a tyepdef to get the length.
 */
char *
int_to_base64(b64_string_t s, int a)
{
    int i, j;
    unsigned int n;

    i = 0;
    if (a == 0)
	s[i++] = c_xlate[0];
    else {
	j = 24;
	n = a & 0xc0000000;
	if (n) {
	    n >>= 30;
	    s[i++] = c_xlate[n];
	    a &= ~0xc0000000;
	} else {
	    for (; j >= 0; j -= 6) {
		n = a & (0x3f << j);
		if (n)
		    break;	/* found highest bits set. */
	    }
	    s[i++] = c_xlate[n >> j];
	    a &= ~(0x3f << j);
	    j -= 6;
	}
	/* more to do. */
	for (; j >= 0; j -= 6) {
	    n = a & (0x3f << j);
	    s[i++] = c_xlate[n >> j];
	    a &= ~(0x3f << j);
	}
    }
    s[i] = '\0';
    return s;
}

/* Mapping: +=0, ,=1, 0-9 = 2-11, A-Z = 12-37, a-z = 38-63 */
int
base64_to_int(char *s)
{
    int n = 0;
    int result = 0;
    unsigned char *p;

    for (; *s; s++) {
	if (*s < '0') {
	    n = *s - '+';
	} else if (*s <= '9') {
	    n = 2 + (int)(*s - '0');
	} else if (*s <= 'Z') {
	    n = 12 + (int)(*s - 'A');
	} else {
	    n = 38 + (int)(*s - 'a');
	}
	result = (result << 6) + n;
    }
    return result;
}


#endif /* AFS_SGI_XFS_IOPS_ENV */
Commit	Line	Data
805e021f CE	1	/*
	2	* Copyright 2000, International Business Machines Corporation and others.
	3	* All Rights Reserved.
	4	*
	5	* This software has been released under the terms of the IBM Public
	6	* License. For details, see the LICENSE file in the top-level source
	7	* directory or online at http://www.openafs.org/dl/license10.html
	8	*/
	9
	10	#include <afsconfig.h>
	11	#include <afs/param.h>
	12
	13
	14
	15	#ifdef AFS_SGI_XFS_IOPS_ENV
	16
	17	static char c_xlate[80] =
	18	"+,0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
	19
	20	/* int_to_base64
	21	* Create a base 64 string representation of a number.
	22	* The supplied string 's' must be at least 8 bytes long.
	23	* b64_string in stds.h provides a tyepdef to get the length.
	24	*/
	25	char *
	26	int_to_base64(b64_string_t s, int a)
	27	{
	28	int i, j;
	29	unsigned int n;
	30
	31	i = 0;
	32	if (a == 0)
	33	s[i++] = c_xlate[0];
	34	else {
	35	j = 24;
	36	n = a & 0xc0000000;
	37	if (n) {
	38	n >>= 30;
	39	s[i++] = c_xlate[n];
	40	a &= ~0xc0000000;
	41	} else {
	42	for (; j >= 0; j -= 6) {
	43	n = a & (0x3f << j);
	44	if (n)
	45	break; /* found highest bits set. */
	46	}
	47	s[i++] = c_xlate[n >> j];
	48	a &= ~(0x3f << j);
	49	j -= 6;
	50	}
	51	/* more to do. */
	52	for (; j >= 0; j -= 6) {
	53	n = a & (0x3f << j);
	54	s[i++] = c_xlate[n >> j];
	55	a &= ~(0x3f << j);
	56	}
	57	}
	58	s[i] = '\0';
	59	return s;
	60	}
	61
	62	/* Mapping: +=0, ,=1, 0-9 = 2-11, A-Z = 12-37, a-z = 38-63 */
	63	int
	64	base64_to_int(char *s)
65	{
66	int n = 0;
67	int result = 0;
68	unsigned char *p;
69
70	for (; *s; s++) {
71	if (*s < '0') {
72	n = *s - '+';
73	} else if (*s <= '9') {
74	n = 2 + (int)(*s - '0');
75	} else if (*s <= 'Z') {
76	n = 12 + (int)(*s - 'A');
77	} else {
78	n = 38 + (int)(*s - 'a');
79	}
80	result = (result << 6) + n;
81	}
82	return result;
83	}
84
85
86	#endif /* AFS_SGI_XFS_IOPS_ENV */