apple IOS的base64编解码

<pre style="word-wrap: break-word; white-space: pre-wrap;">/*
* Copyright (c) 2003 Apple Computer, Inc. All rights reserved.
*
* @APPLE_LICENSE_HEADER_START@
*
* Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
*
* This file contains Original Code and/or Modifications of Original Code
* as defined in and that are subject to the Apple Public Source License
* Version 2.0 (the 'License'). You may not use this file except in
* compliance with the License. Please obtain a copy of the License at
* http://www.opensource.apple.com/apsl/ and read it before using this
* file.
*
* The Original Code and all software distributed under the License are
* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
* Please see the License for the specific language governing rights and
* limitations under the License.
*
* @APPLE_LICENSE_HEADER_END@
*/
/* ====================================================================
* Copyright (c) 1995-1999 The Apache Group.  All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
*
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in
*    the documentation and/or other materials provided with the
*    distribution.
*
* 3. All advertising materials mentioning features or use of this
*    software must display the following acknowledgment:
*    "This product includes software developed by the Apache Group
*    for use in the Apache HTTP server project (http://www.apache.org/)."
*
* 4. The names "Apache Server" and "Apache Group" must not be used to
*    endorse or promote products derived from this software without
*    prior written permission. For written permission, please contact
*    apache@apache.org.
*
* 5. Products derived from this software may not be called "Apache"
*    nor may "Apache" appear in their names without prior written
*    permission of the Apache Group.
*
* 6. Redistributions of any form whatsoever must retain the following
*    acknowledgment:
*    "This product includes software developed by the Apache Group
*    for use in the Apache HTTP server project (http://www.apache.org/)."
*
* THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``AS IS'' AND ANY
* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE APACHE GROUP OR
* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
* OF THE POSSIBILITY OF SUCH DAMAGE.
* ====================================================================
*
* This software consists of voluntary contributions made by many
* individuals on behalf of the Apache Group and was originally based
* on public domain software written at the National Center for
* Supercomputing Applications, University of Illinois, Urbana-Champaign.
* For more information on the Apache Group and the Apache HTTP server
* project, please see <http://www.apache.org/>.
*
*/

#ifndef _BASE64_H_
#define _BASE64_H_

#ifdef __cplusplus
extern "C" {
#endif

int Base64encode_len(int len);
int Base64encode(char * coded_dst, const char *plain_src,int len_plain_src);

int Base64decode_len(const char * coded_src);
int Base64decode(char * plain_dst, const char *coded_src);

#ifdef __cplusplus
}
#endif

#endif //_BASE64_H_

/** Copyright (c) 2003 Apple Computer, Inc. All rights reserved.** @APPLE_LICENSE_HEADER_START@** Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.** This file contains Original Code and/or Modifications of Original Code* as defined in and that are subject to the Apple Public Source License* Version 2.0 (the 'License'). You may not use this file except in* compliance with the License. Please obtain a copy of the License at* http://www.opensource.apple.com/apsl/ and read it before using this* file.** The Original Code and all software distributed under the License are* distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER* EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,* INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,* FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.* Please see the License for the specific language governing rights and* limitations under the License.** @APPLE_LICENSE_HEADER_END@*//* ====================================================================* Copyright (c) 1995-1999 The Apache Group.  All rights reserved.** Redistribution and use in source and binary forms, with or without* modification, are permitted provided that the following conditions* are met:** 1. Redistributions of source code must retain the above copyright*    notice, this list of conditions and the following disclaimer.** 2. Redistributions in binary form must reproduce the above copyright*    notice, this list of conditions and the following disclaimer in*    the documentation and/or other materials provided with the*    distribution.** 3. All advertising materials mentioning features or use of this*    software must display the following acknowledgment:*    "This product includes software developed by the Apache Group*    for use in the Apache HTTP server project (http://www.apache.org/)."** 4. The names "Apache Server" and "Apache Group" must not be used to*    endorse or promote products derived from this software without*    prior written permission. For written permission, please contact*    apache@apache.org.** 5. Products derived from this software may not be called "Apache"*    nor may "Apache" appear in their names without prior written*    permission of the Apache Group.** 6. Redistributions of any form whatsoever must retain the following*    acknowledgment:*    "This product includes software developed by the Apache Group*    for use in the Apache HTTP server project (http://www.apache.org/)."** THIS SOFTWARE IS PROVIDED BY THE APACHE GROUP ``AS IS'' AND ANY* EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE APACHE GROUP OR* ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,* STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED* OF THE POSSIBILITY OF SUCH DAMAGE.* ====================================================================** This software consists of voluntary contributions made by many* individuals on behalf of the Apache Group and was originally based* on public domain software written at the National Center for* Supercomputing Applications, University of Illinois, Urbana-Champaign.* For more information on the Apache Group and the Apache HTTP server* project, please see <http://www.apache.org/>.**//* Base64 encoder/decoder. Originally Apache file ap_base64.c*/#include <string.h>#include "base64.h"/* aaaack but it's fast and const should make it shared text page. */static const unsigned char pr2six[256] ={/* ASCII table */64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 62, 64, 64, 64, 63,52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 64, 64, 64, 64, 64, 64,64,  0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14,15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 64, 64, 64, 64, 64,64, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, 40,41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 64, 64, 64, 64, 64,64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64,64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64, 64};int Base64decode_len(const char *bufcoded){int nbytesdecoded;register const unsigned char *bufin;register int nprbytes;bufin = (const unsigned char *) bufcoded;while (pr2six[*(bufin++)] <= 63);nprbytes = (bufin - (const unsigned char *) bufcoded) - 1;nbytesdecoded = ((nprbytes + 3) / 4) * 3;return nbytesdecoded + 1;}int Base64decode(char *bufplain, const char *bufcoded){int nbytesdecoded;register const unsigned char *bufin;register unsigned char *bufout;register int nprbytes;bufin = (const unsigned char *) bufcoded;while (pr2six[*(bufin++)] <= 63);nprbytes = (bufin - (const unsigned char *) bufcoded) - 1;nbytesdecoded = ((nprbytes + 3) / 4) * 3;bufout = (unsigned char *) bufplain;bufin = (const unsigned char *) bufcoded;while (nprbytes > 4) {*(bufout++) =(unsigned char) (pr2six[*bufin] << 2 | pr2six[bufin[1]] >> 4);*(bufout++) =(unsigned char) (pr2six[bufin[1]] << 4 | pr2six[bufin[2]] >> 2);*(bufout++) =(unsigned char) (pr2six[bufin[2]] << 6 | pr2six[bufin[3]]);bufin += 4;nprbytes -= 4;}/* Note: (nprbytes == 1) would be an error, so just ingore that case */if (nprbytes > 1) {*(bufout++) =(unsigned char) (pr2six[*bufin] << 2 | pr2six[bufin[1]] >> 4);}if (nprbytes > 2) {*(bufout++) =(unsigned char) (pr2six[bufin[1]] << 4 | pr2six[bufin[2]] >> 2);}if (nprbytes > 3) {*(bufout++) =(unsigned char) (pr2six[bufin[2]] << 6 | pr2six[bufin[3]]);}*(bufout++) = '\0';nbytesdecoded -= (4 - nprbytes) & 3;return nbytesdecoded;}static const char basis_64[] ="ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";int Base64encode_len(int len){return ((len + 2) / 3 * 4) + 1;}int Base64encode(char *encoded, const char *string, int len){int i;char *p;p = encoded;for (i = 0; i < len - 2; i += 3) {*p++ = basis_64[(string[i] >> 2) & 0x3F];*p++ = basis_64[((string[i] & 0x3) << 4) |((int) (string[i + 1] & 0xF0) >> 4)];*p++ = basis_64[((string[i + 1] & 0xF) << 2) |((int) (string[i + 2] & 0xC0) >> 6)];*p++ = basis_64[string[i + 2] & 0x3F];}if (i < len) {*p++ = basis_64[(string[i] >> 2) & 0x3F];if (i == (len - 1)) {*p++ = basis_64[((string[i] & 0x3) << 4)];*p++ = '=';}else {*p++ = basis_64[((string[i] & 0x3) << 4) |((int) (string[i + 1] & 0xF0) >> 4)];*p++ = basis_64[((string[i + 1] & 0xF) << 2)];}*p++ = '=';}*p++ = '\0';return p - encoded;}