1 | /* |
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2 | * Copyright (c) 1999 |
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3 | * University of California. All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * 1. Redistributions of source code must retain the above copyright |
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9 | * notice, this list of conditions and the following disclaimer. |
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10 | * 2. Redistributions in binary form must reproduce the above copyright |
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11 | * notice, this list of conditions and the following disclaimer in the |
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12 | * documentation and/or other materials provided with the distribution. |
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13 | * 3. Neither the name of the author nor the names of any co-contributors |
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14 | * may be used to endorse or promote products derived from this software |
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15 | * without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY CONTRIBUTORS ``AS IS'' AND ANY EXPRESS |
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18 | * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED |
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19 | * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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20 | * ARE DISCLAIMED. IN NO EVENT SHALL CONTRIBUTORS BE LIABLE FOR ANY |
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21 | * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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22 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE |
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23 | * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
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24 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER |
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25 | * IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR |
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26 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN |
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27 | * IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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28 | */ |
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29 | |
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30 | #include <sys/cdefs.h> |
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31 | __FBSDID("$FreeBSD$"); |
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32 | |
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33 | #include <sys/types.h> |
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34 | |
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35 | #include <crypt.h> |
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36 | |
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37 | static const char itoa64[] = /* 0 ... 63 => ascii - 64 */ |
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38 | "./0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"; |
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39 | |
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40 | void |
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41 | _crypt_to64(char *s, u_long v, int n) |
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42 | { |
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43 | while (--n >= 0) { |
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44 | *s++ = itoa64[v&0x3f]; |
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45 | v >>= 6; |
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46 | } |
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47 | } |
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48 | |
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49 | void |
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50 | b64_from_24bit(uint8_t B2, uint8_t B1, uint8_t B0, int n, int *buflen, char **cp) |
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51 | { |
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52 | uint32_t w; |
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53 | int i; |
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54 | |
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55 | w = (B2 << 16) | (B1 << 8) | B0; |
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56 | for (i = 0; i < n; i++) { |
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57 | **cp = itoa64[w&0x3f]; |
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58 | (*cp)++; |
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59 | if ((*buflen)-- < 0) |
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60 | break; |
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61 | w >>= 6; |
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62 | } |
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63 | } |
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