ermyth/src/ubase64.C

/*
 * ubase64.C: ircu base64 routines.
 * Rights to this code are documented in doc/pod/license.pod.
 *
 * Copyright © 2005-2007 Atheme Project (http://www.atheme.org)
 */

static char const rcsid[] = "$Id";

#include "atheme.h"

/*
 * base64touint() written 01/20/06 by jilles, for getting IP addresses.
 */

static const char ub64_alphabet[65] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789[]";
#define __ '\377'
static const char ub64_lookuptab[256] = {
  __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,       /* 0-15 */
  __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,       /* 16-31 */
  __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,       /* 32-47 */
  52, 53, 54, 55, 56, 57, 58, 59, 60, 61, __, __, __, __, __, __,       /* 48-63 */
  __, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, /* 64-79 */
  15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 62, __, 63, __, __,       /* 80-95 */
  __, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,       /* 96-111 */
  41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, __, __, __, __, __,       /* 112-127 */
  __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
  __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
  __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
  __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
  __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
  __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
  __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
  __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __
};

#undef __

const char *
uinttobase64 (char *buf, uint64_t v, int64_t count)
{
  buf[count] = '\0';

  while (count >= 0)
    {
      buf[--count] = ub64_alphabet[v & 63];
      v >>= 6;
    }

  return buf;
}

unsigned int
base64touint (char *buf)
{
  int bits;
  unsigned int v = 0;
  int count = 6;

  while (--count >= 0 && (bits = ub64_lookuptab[255 & *buf++]) != '\377')
    v = v << 6 | bits;
  return v;
}

/* vim:cinoptions=>s,e0,n0,f0,{0,}0,^0,=s,ps,t0,c3,+s,(2s,us,)20,*30,gs,hs
 * vim:ts=8
 * vim:sw=8
 * vim:noexpandtab
 */
Revision:	1.2
Committed:	Sat Jul 21 01:29:13 2007 UTC (16 years, 10 months ago) by pippijn
Content type:	text/plain
Branch:	MAIN
Changes since 1.1:	+1 -1 lines
Log Message:	- moved to new documentation system - fixed small build error
#	User	Rev	Content
1	pippijn	1.1	/*
2			* ubase64.C: ircu base64 routines.
3	pippijn	1.2	* Rights to this code are documented in doc/pod/license.pod.
4	pippijn	1.1	*
5			* Copyright © 2005-2007 Atheme Project (http://www.atheme.org)
6			*/
7
8			static char const rcsid[] = "$Id";
9
10			#include "atheme.h"
11
12			/*
13			* base64touint() written 01/20/06 by jilles, for getting IP addresses.
14			*/
15
16			static const char ub64_alphabet[65] = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789[]";
17			#define __ '\377'
18			static const char ub64_lookuptab[256] = {
19			__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, /* 0-15 */
20			__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, /* 16-31 */
21			__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __, /* 32-47 */
22			52, 53, 54, 55, 56, 57, 58, 59, 60, 61, __, __, __, __, __, __, /* 48-63 */
23			__, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, /* 64-79 */
24			15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 62, __, 63, __, __, /* 80-95 */
25			__, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40, /* 96-111 */
26			41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, __, __, __, __, __, /* 112-127 */
27			__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
28			__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
29			__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
30			__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
31			__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
32			__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
33			__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __,
34			__, __, __, __, __, __, __, __, __, __, __, __, __, __, __, __
35			};
36
37			#undef __
38
39			const char *
40			uinttobase64 (char *buf, uint64_t v, int64_t count)
41			{
42			buf[count] = '\0';
43
44			while (count >= 0)
45			{
46			buf[--count] = ub64_alphabet[v & 63];
47			v >>= 6;
48			}
49
50			return buf;
51			}
52
53			unsigned int
54			base64touint (char *buf)
55			{
56			int bits;
57			unsigned int v = 0;
58			int count = 6;
59
60			while (--count >= 0 && (bits = ub64_lookuptab[255 & *buf++]) != '\377')
61			v = v << 6 \| bits;
62			return v;
63			}
64
65			/* vim:cinoptions=>s,e0,n0,f0,{0,}0,^0,=s,ps,t0,c3,+s,(2s,us,)20,*30,gs,hs
66			* vim:ts=8
67			* vim:sw=8
68			* vim:noexpandtab
69			*/