quoted-printable.cpp

来自「funambol window mobile客户端源代码」· C++ 代码 · 共 129 行

/*
 * Funambol is a mobile platform developed by Funambol, Inc. 
 * Copyright (C) 2003 - 2007 Funambol, Inc.
 * 
 * This program is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Affero General Public License version 3 as published by
 * the Free Software Foundation with the addition of the following permission 
 * added to Section 15 as permitted in Section 7(a): FOR ANY PART OF THE COVERED
 * WORK IN WHICH THE COPYRIGHT IS OWNED BY FUNAMBOL, FUNAMBOL DISCLAIMS THE 
 * WARRANTY OF NON INFRINGEMENT  OF THIRD PARTY RIGHTS.
 * 
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
 * details.
 * 
 * You should have received a copy of the GNU Affero General Public License 
 * along with this program; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
 * MA 02110-1301 USA.
 * 
 * You can contact Funambol, Inc. headquarters at 643 Bair Island Road, Suite 
 * 305, Redwood City, CA 94063, USA, or at email address [e-mail].
 * 
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License version 3.
 * 
 * In accordance with Section 7(b) of the GNU Affero General Public License
 * version 3, these Appropriate Legal Notices must retain the display of the
 * "Powered by Funambol" logo. If the display of the logo is not reasonably 
 * feasible for technical reasons, the Appropriate Legal Notices must display
 * the words "Powered by Funambol".
 */

#include "base/fscapi.h"
#include "base/quoted-printable.h"
#include "base/globalsdef.h"

BEGIN_NAMESPACE

static int hex2int( char x )
{
    return (x >= '0' && x <= '9') ? x - '0' :
        (x >= 'A' && x <= 'F') ? x - 'A' + 10 :
        (x >= 'a' && x <= 'f') ? x - 'a' + 10 :
        0;
}

char *qp_decode(const char *qp)
{
    const char *in;
    char *ret = new char[strlen(qp)+1];
    char *out = ret;

    for (in = qp; *in; in++ ) {
        // Handle encoded chars
        if ( *in == '=' ) {
            if (in[1] && in[2] ) {
                // The sequence is complete, check it
                in++;   // skip the '='
                if (in[0] == '\r' && in[1] == '\n') {
                    // soft line break, ignore it
                    in ++;
                    continue;
                }
                else if ( isxdigit(in[0]) && isxdigit(in[1]) ) {
                    // Ok, we have two hex digit: decode them
                    *out = (hex2int(in[0]) << 4) | hex2int(in[1]);
                    out++;
                    in ++;
                    continue;
                }
            }
            // In all wrong cases leave the original bytes
            // (see RFC 2045). They can be incomplete sequence,
            // or a '=' followed by non hex digit.
        }
        // TODO:
        // RFC 2045 says to exclude control characters mistakenly
        // present (unencoded) in the encoded stream.

        // Copy other characters
        *out = *in;
        out++;
    }
    *out = 0;

    return ret;
}

// A simple version of qp_encoding
char *qp_encode(const char *qp) {
    char QP_DIGITS[] = "0123456789ABCDEF";
    char* ret = new char[strlen(qp)*3+1];
    int i = 0;

    const char *in;
    for (in = qp; *in; in++ ) {
        if ( (0x21 <= in[0]) & (in[0] <= 0x7e) && in[0] != '=' ) {
            ret[i] = *in;
            i++;
        }
        else {
            ret[i] = '=';
            i++;
            ret[i] = QP_DIGITS[in[0] >> 4 & 0xf];
            i++;
            ret[i] = QP_DIGITS[in[0] & 0xf];
            i++;
        }
    }

    ret[i] = '\0';

    return ret;
}

bool qp_isNeed(const char *in) {
    for(int i = 0; i < int(strlen(in)); i++)
        if ( (0x21 > in[i]) || (in[i] > 0x7e) || in[i] == '=' )
            return true;

    return false;
}

END_NAMESPACE