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72 lines
2.0 KiB
C
72 lines
2.0 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Copyright 2006 Rob Landley <rob@landley.net>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include "libbb.h"
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/* Conversion table. for base 64 */
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const char bb_uuenc_tbl_base64[65 + 2] = {
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'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H',
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'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P',
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'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X',
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'Y', 'Z', 'a', 'b', 'c', 'd', 'e', 'f',
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'g', 'h', 'i', 'j', 'k', 'l', 'm', 'n',
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'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
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'w', 'x', 'y', 'z', '0', '1', '2', '3',
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'4', '5', '6', '7', '8', '9', '+', '/',
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'=' /* termination character */,
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'\n', '\0' /* needed for uudecode.c */
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};
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const char bb_uuenc_tbl_std[65] = {
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'`', '!', '"', '#', '$', '%', '&', '\'',
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'(', ')', '*', '+', ',', '-', '.', '/',
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'0', '1', '2', '3', '4', '5', '6', '7',
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'8', '9', ':', ';', '<', '=', '>', '?',
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'@', 'A', 'B', 'C', 'D', 'E', 'F', 'G',
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'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O',
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'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W',
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'X', 'Y', 'Z', '[', '\\', ']', '^', '_',
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'`' /* termination character */
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};
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/*
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* Encode bytes at S of length LENGTH to uuencode or base64 format and place it
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* to STORE. STORE will be 0-terminated, and must point to a writable
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* buffer of at least 1+BASE64_LENGTH(length) bytes.
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* where BASE64_LENGTH(len) = (4 * ((LENGTH + 2) / 3))
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*/
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void bb_uuencode(char *p, const void *src, int length, const char *tbl)
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{
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const unsigned char *s = src;
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/* Transform the 3x8 bits to 4x6 bits */
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while (length > 0) {
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unsigned s1, s2;
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/* Are s[1], s[2] valid or should be assumed 0? */
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s1 = s2 = 0;
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length -= 3; /* can be >=0, -1, -2 */
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if (length >= -1) {
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s1 = s[1];
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if (length >= 0)
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s2 = s[2];
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}
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*p++ = tbl[s[0] >> 2];
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*p++ = tbl[((s[0] & 3) << 4) + (s1 >> 4)];
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*p++ = tbl[((s1 & 0xf) << 2) + (s2 >> 6)];
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*p++ = tbl[s2 & 0x3f];
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s += 3;
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}
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/* Zero-terminate */
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*p = '\0';
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/* If length is -2 or -1, pad last char or two */
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while (length) {
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*--p = tbl[64];
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length++;
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}
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}
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