busybox/libbb/uuencode.c

/* vi: set sw=4 ts=4: */
/*
 * Copyright 2006 Rob Landley <rob@landley.net>
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include "libbb.h"

/* Conversion table.  for base 64 */
const char bb_uuenc_tbl_base64[65] = {
	'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
	'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
	'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
	'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
	'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
	'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
	'w', 'x', 'y', 'z', '0', '1', '2', '3',
	'4', '5', '6', '7', '8', '9', '+', '/',
	'=' /* termination character */
};

const char bb_uuenc_tbl_std[65] = {
	'`', '!', '"', '#', '$', '%', '&', '\'',
	'(', ')', '*', '+', ',', '-', '.', '/',
	'0', '1', '2', '3', '4', '5', '6', '7',
	'8', '9', ':', ';', '<', '=', '>', '?',
	'@', 'A', 'B', 'C', 'D', 'E', 'F', 'G',
	'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
	'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
	'X', 'Y', 'Z', '[', '\\', ']', '^', '_',
	'`' /* termination character */
};

/*
 * Encode the string S of length LENGTH to base64 format and place it
 * to STORE.  STORE will be 0-terminated, and must point to a writable
 * buffer of at least 1+BASE64_LENGTH(length) bytes.
 * where BASE64_LENGTH(len) = (4 * ((LENGTH + 2) / 3))
 */
void bb_uuencode(const unsigned char *s, char *store, const int length, const char *tbl)
{
	int i;
	char *p = store;

	/* Transform the 3x8 bits to 4x6 bits, as required by base64.  */
	for (i = 0; i < length; i += 3) {
		*p++ = tbl[s[0] >> 2];
		*p++ = tbl[((s[0] & 3) << 4) + (s[1] >> 4)];
		*p++ = tbl[((s[1] & 0xf) << 2) + (s[2] >> 6)];
		*p++ = tbl[s[2] & 0x3f];
		s += 3;
	}
	/* Pad the result if necessary...  */
	if (i == length + 1) {
		*(p - 1) = tbl[64];
	}
	else if (i == length + 2) {
		*(p - 1) = *(p - 2) = tbl[64];
	}
	/* ...and zero-terminate it.  */
	*p = '\0';
}
1	/* vi: set sw=4 ts=4: */
2	/*
3	* Copyright 2006 Rob Landley <rob@landley.net>
4	*
5	* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
6	*/
7
8	#include "libbb.h"
9
10	/* Conversion table. for base 64 */
11	const char bb_uuenc_tbl_base64[65] = {
12	'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
13	'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
14	'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
15	'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
16	'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
17	'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
18	'w', 'x', 'y', 'z', '0', '1', '2', '3',
19	'4', '5', '6', '7', '8', '9', '+', '/',
20	'=' /* termination character */
21	};
22
23	const char bb_uuenc_tbl_std[65] = {
24	'`', '!', '"', '#', '$', '%', '&', '\'',
25	'(', ')', '*', '+', ',', '-', '.', '/',
26	'0', '1', '2', '3', '4', '5', '6', '7',
27	'8', '9', ':', ';', '<', '=', '>', '?',
28	'@', 'A', 'B', 'C', 'D', 'E', 'F', 'G',
29	'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
30	'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
31	'X', 'Y', 'Z', '[', '\\', ']', '^', '_',
32	'`' /* termination character */
33	};
34
35	/*
36	* Encode the string S of length LENGTH to base64 format and place it
37	* to STORE. STORE will be 0-terminated, and must point to a writable
38	* buffer of at least 1+BASE64_LENGTH(length) bytes.
39	* where BASE64_LENGTH(len) = (4 * ((LENGTH + 2) / 3))
40	*/
41	void bb_uuencode(const unsigned char s, char store, const int length, const char *tbl)
42	{
43	int i;
44	char *p = store;
45
46	/* Transform the 3x8 bits to 4x6 bits, as required by base64. */
47	for (i = 0; i < length; i += 3) {
48	*p++ = tbl[s[0] >> 2];
49	*p++ = tbl[((s[0] & 3) << 4) + (s[1] >> 4)];
50	*p++ = tbl[((s[1] & 0xf) << 2) + (s[2] >> 6)];
51	*p++ = tbl[s[2] & 0x3f];
52	s += 3;
53	}
54	/* Pad the result if necessary... */
55	if (i == length + 1) {
56	*(p - 1) = tbl[64];
57	}
58	else if (i == length + 2) {
59	(p - 1) = (p - 2) = tbl[64];
60	}
61	/* ...and zero-terminate it. */
62	*p = '\0';
63	}