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 *    [e-mail]. * * 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 __cplusplusextern "C" {#endifint 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 *    [e-mail]. * * 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;}