uuencode.c

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/*
   +----------------------------------------------------------------------+
   | Copyright (c) The PHP Group                                          |
   +----------------------------------------------------------------------+
   | This source file is subject to version 3.01 of the PHP license,      |
   | that is bundled with this package in the file LICENSE, and is        |
   | available through the world-wide-web at the following url:           |
   | https://www.php.net/license/3_01.txt                                 |
   | If you did not receive a copy of the PHP license and are unable to   |
   | obtain it through the world-wide-web, please send a note to          |
   | license@php.net so we can mail you a copy immediately.               |
   +----------------------------------------------------------------------+
   | Author: Ilia Alshanetsky <ilia@php.net>                              |
   +----------------------------------------------------------------------+
 */
 
/*
 * Portions of this code are based on Berkeley's uuencode/uudecode
 * implementation.
 *
 * Copyright (c) 1983, 1993
 *  The Regents of the University of California.  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 acknowledgement:
 *  This product includes software developed by the University of
 *  California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS 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 REGENTS OR 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.
 */
 
#include <math.h>
 
#include "php.h"
#include "php_uuencode.h"
 
#define PHP_UU_ENC(c) ((c) ? ((c) & 077) + ' ' : '`')
#define PHP_UU_ENC_C2(c) PHP_UU_ENC(((*(c) << 4) & 060) | ((*((c) + 1) >> 4) & 017))
#define PHP_UU_ENC_C3(c) PHP_UU_ENC(((*(c + 1) << 2) & 074) | ((*((c) + 2) >> 6) & 03))
 
#define PHP_UU_DEC(c) (((c) - ' ') & 077)
 
PHPAPI zend_string *php_uuencode(const char *src, size_t src_len) /* {{{ */
{
    size_t len = 45;
    unsigned char *p;
    const unsigned char *s, *e, *ee;
    zend_string *dest;
 
    /* encoded length is ~ 38% greater than the original
       Use 1.5 for easier calculation.
    */
    dest = zend_string_safe_alloc(src_len/2, 3, 46, 0);
    p = (unsigned char *) ZSTR_VAL(dest);
    s = (unsigned char *) src;
    e = s + src_len;
 
    while ((s + 3) < e) {
        ee = s + len;
        if (ee > e) {
            ee = e;
            len = ee - s;
            if (len % 3) {
                ee = s + (int) (floor((double)len / 3) * 3);
            }
        }
        *p++ = PHP_UU_ENC(len);
 
        while (s < ee) {
            *p++ = PHP_UU_ENC(*s >> 2);
            *p++ = PHP_UU_ENC_C2(s);
            *p++ = PHP_UU_ENC_C3(s);
            *p++ = PHP_UU_ENC(*(s + 2) & 077);
 
            s += 3;
        }
 
        if (len == 45) {
            *p++ = '\n';
        }
    }
 
    if (s < e) {
        if (len == 45) {
            *p++ = PHP_UU_ENC(e - s);
            len = 0;
        }
 
        *p++ = PHP_UU_ENC(*s >> 2);
        *p++ = PHP_UU_ENC_C2(s);
        *p++ = ((e - s) > 1) ? PHP_UU_ENC_C3(s) : PHP_UU_ENC('\0');
        *p++ = ((e - s) > 2) ? PHP_UU_ENC(*(s + 2) & 077) : PHP_UU_ENC('\0');
    }
 
    if (len < 45) {
        *p++ = '\n';
    }
 
    *p++ = PHP_UU_ENC('\0');
    *p++ = '\n';
    *p = '\0';
 
    dest = zend_string_truncate(dest, (char *) p - ZSTR_VAL(dest), 0);
    return dest;
}
/* }}} */
 
PHPAPI zend_string *php_uudecode(const char *src, size_t src_len) /* {{{ */
{
    size_t len, total_len=0;
    char *p;
    const char *s, *e, *ee;
    zend_string *dest;
 
    if (src_len == 0) {
        return NULL;
    }
 
    dest = zend_string_alloc((size_t) ceil(src_len * 0.75), 0);
    p = ZSTR_VAL(dest);
    s = src;
    e = src + src_len;
 
    while (s < e) {
        if ((len = PHP_UU_DEC(*s++)) == 0) {
            break;
        }
        /* sanity check */
        if (len > src_len) {
            goto err;
        }
 
        total_len += len;
 
        ee = s + (len == 45 ? 60 : (int) floor(len * 1.33));
        /* sanity check */
        if (ee > e) {
            goto err;
        }
 
        while (s < ee) {
            if(s+4 > e) {
                goto err;
            }
            *p++ = PHP_UU_DEC(*s) << 2 | PHP_UU_DEC(*(s + 1)) >> 4;
            *p++ = PHP_UU_DEC(*(s + 1)) << 4 | PHP_UU_DEC(*(s + 2)) >> 2;
            *p++ = PHP_UU_DEC(*(s + 2)) << 6 | PHP_UU_DEC(*(s + 3));
            s += 4;
        }
 
        if (len < 45) {
            break;
        }
 
        /* skip \n */
        s++;
    }
 
    assert(p >= ZSTR_VAL(dest));
    if ((len = total_len) > (size_t)(p - ZSTR_VAL(dest))) {
        *p++ = PHP_UU_DEC(*s) << 2 | PHP_UU_DEC(*(s + 1)) >> 4;
        if (len > 1) {
            *p++ = PHP_UU_DEC(*(s + 1)) << 4 | PHP_UU_DEC(*(s + 2)) >> 2;
            if (len > 2) {
                *p++ = PHP_UU_DEC(*(s + 2)) << 6 | PHP_UU_DEC(*(s + 3));
            }
        }
    }
 
    ZSTR_LEN(dest) = total_len;
    ZSTR_VAL(dest)[ZSTR_LEN(dest)] = '\0';
 
    return dest;
 
err:
    zend_string_efree(dest);
 
    return NULL;
}
/* }}} */
 
/* {{{ uuencode a string */
PHP_FUNCTION(convert_uuencode)
{
    zend_string *src;
 
    ZEND_PARSE_PARAMETERS_START(1, 1)
        Z_PARAM_STR(src)
    ZEND_PARSE_PARAMETERS_END();
 
    RETURN_STR(php_uuencode(ZSTR_VAL(src), ZSTR_LEN(src)));
}
/* }}} */
 
/* {{{ decode a uuencoded string */
PHP_FUNCTION(convert_uudecode)
{
    zend_string *src;
    zend_string *dest;
 
    ZEND_PARSE_PARAMETERS_START(1, 1)
        Z_PARAM_STR(src)
    ZEND_PARSE_PARAMETERS_END();
 
    if ((dest = php_uudecode(ZSTR_VAL(src), ZSTR_LEN(src))) == NULL) {
        php_error_docref(NULL, E_WARNING, "Argument #1 ($data) is not a valid uuencoded string");
        RETURN_FALSE;
    }
 
    RETURN_STR(dest);
}
/* }}} */