apple IOS的base64编解码

痛定思痛。 2022-07-19 06:30 246阅读 0赞

<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;
    }