Annotation of embedaddon/php/ext/standard/uuencode.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:    +----------------------------------------------------------------------+
                      3:    | PHP Version 5                                                        |
                      4:    +----------------------------------------------------------------------+
                      5:    | Copyright (c) 1997-2012 The PHP Group                                |
                      6:    +----------------------------------------------------------------------+
                      7:    | This source file is subject to version 3.01 of the PHP license,      |
                      8:    | that is bundled with this package in the file LICENSE, and is        |
                      9:    | available through the world-wide-web at the following url:           |
                     10:    | http://www.php.net/license/3_01.txt                                  |
                     11:    | If you did not receive a copy of the PHP license and are unable to   |
                     12:    | obtain it through the world-wide-web, please send a note to          |
                     13:    | license@php.net so we can mail you a copy immediately.               |
                     14:    +----------------------------------------------------------------------+
                     15:    | Author: Ilia Alshanetsky <ilia@php.net>                              |
                     16:    +----------------------------------------------------------------------+
                     17:  */
                     18: 
                     19: /* $Id: uuencode.c 321634 2012-01-01 13:15:04Z felipe $ */
                     20: 
                     21: /*
                     22:  * Portions of this code are based on Berkeley's uuencode/uudecode
                     23:  * implementation.
                     24:  *
                     25:  * Copyright (c) 1983, 1993
                     26:  *  The Regents of the University of California.  All rights reserved.
                     27:  *
                     28:  * Redistribution and use in source and binary forms, with or without
                     29:  * modification, are permitted provided that the following conditions
                     30:  * are met:
                     31:  * 1. Redistributions of source code must retain the above copyright
                     32:  *    notice, this list of conditions and the following disclaimer.
                     33:  * 2. Redistributions in binary form must reproduce the above copyright
                     34:  *    notice, this list of conditions and the following disclaimer in the
                     35:  *    documentation and/or other materials provided with the distribution.
                     36:  * 3. All advertising materials mentioning features or use of this software
                     37:  *    must display the following acknowledgement:
                     38:  *  This product includes software developed by the University of
                     39:  *  California, Berkeley and its contributors.
                     40:  * 4. Neither the name of the University nor the names of its contributors
                     41:  *    may be used to endorse or promote products derived from this software
                     42:  *    without specific prior written permission.
                     43:  *
                     44:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     45:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     46:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     47:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     48:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     49:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     50:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     51:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     52:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     53:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     54:  * SUCH DAMAGE.
                     55:  */
                     56: 
                     57: #include <math.h>
                     58: 
                     59: #include "php.h"
                     60: #include "php_uuencode.h"
                     61: 
                     62: #define PHP_UU_ENC(c) ((c) ? ((c) & 077) + ' ' : '`')
                     63: #define PHP_UU_ENC_C2(c) PHP_UU_ENC(((*(c) << 4) & 060) | ((*((c) + 1) >> 4) & 017))
                     64: #define PHP_UU_ENC_C3(c) PHP_UU_ENC(((*(c + 1) << 2) & 074) | ((*((c) + 2) >> 6) & 03))
                     65: 
                     66: #define PHP_UU_DEC(c) (((c) - ' ') & 077)
                     67: 
                     68: PHPAPI int php_uuencode(char *src, int src_len, char **dest) /* {{{ */
                     69: {
                     70:        int len = 45;
                     71:        char *p, *s, *e, *ee;
                     72: 
                     73:        /* encoded length is ~ 38% greater then the original */
                     74:        p = *dest = safe_emalloc((size_t) ceil(src_len * 1.38), 1, 46);
                     75:        s = src;
                     76:        e = src + src_len;
                     77: 
                     78:        while ((s + 3) < e) {
                     79:                ee = s + len;
                     80:                if (ee > e) {
                     81:                        ee = e;
                     82:                        len = ee - s;
                     83:                        if (len % 3) {
                     84:                                ee = s + (int) (floor(len / 3) * 3);
                     85:                        }
                     86:                }
                     87:                *p++ = PHP_UU_ENC(len);
                     88: 
                     89:                while (s < ee) {
                     90:                        *p++ = PHP_UU_ENC(*s >> 2);
                     91:                        *p++ = PHP_UU_ENC_C2(s);
                     92:                        *p++ = PHP_UU_ENC_C3(s);
                     93:                        *p++ = PHP_UU_ENC(*(s + 2) & 077);
                     94: 
                     95:                        s += 3;
                     96:                }
                     97: 
                     98:                if (len == 45) {
                     99:                        *p++ = '\n';
                    100:                }
                    101:        }
                    102: 
                    103:        if (s < e) {
                    104:                if (len == 45) {
                    105:                        *p++ = PHP_UU_ENC(e - s);
                    106:                        len = 0;
                    107:                }
                    108: 
                    109:                *p++ = PHP_UU_ENC(*s >> 2);
                    110:                *p++ = PHP_UU_ENC_C2(s);
                    111:                *p++ = ((e - s) > 1) ? PHP_UU_ENC_C3(s) : PHP_UU_ENC('\0');
                    112:                *p++ = ((e - s) > 2) ? PHP_UU_ENC(*(s + 2) & 077) : PHP_UU_ENC('\0');
                    113:        }
                    114: 
                    115:        if (len < 45) {
                    116:                *p++ = '\n';
                    117:        }
                    118: 
                    119:        *p++ = PHP_UU_ENC('\0');
                    120:        *p++ = '\n';
                    121:        *p = '\0';
                    122: 
                    123:        return (p - *dest);
                    124: }
                    125: /* }}} */
                    126: 
                    127: PHPAPI int php_uudecode(char *src, int src_len, char **dest) /* {{{ */
                    128: {
                    129:        int len, total_len=0;
                    130:        char *s, *e, *p, *ee;
                    131: 
                    132:        p = *dest = safe_emalloc((size_t) ceil(src_len * 0.75), 1, 1);
                    133:        s = src;
                    134:        e = src + src_len;
                    135: 
                    136:        while (s < e) {
                    137:                if ((len = PHP_UU_DEC(*s++)) <= 0) {
                    138:                        break;
                    139:                }
                    140:                /* sanity check */
                    141:                if (len > src_len) {
                    142:                        goto err;
                    143:                }
                    144: 
                    145:                total_len += len;
                    146: 
                    147:                ee = s + (len == 45 ? 60 : (int) floor(len * 1.33));
                    148:                /* sanity check */
                    149:                if (ee > e) {
                    150:                        goto err;
                    151:                }
                    152: 
                    153:                while (s < ee) {
                    154:                        *p++ = PHP_UU_DEC(*s) << 2 | PHP_UU_DEC(*(s + 1)) >> 4;
                    155:                        *p++ = PHP_UU_DEC(*(s + 1)) << 4 | PHP_UU_DEC(*(s + 2)) >> 2;
                    156:                        *p++ = PHP_UU_DEC(*(s + 2)) << 6 | PHP_UU_DEC(*(s + 3));
                    157:                        s += 4;
                    158:                }
                    159: 
                    160:                if (len < 45) {
                    161:                        break;
                    162:                }
                    163: 
                    164:                /* skip \n */
                    165:                s++;
                    166:        }
                    167: 
                    168:        if ((len = total_len > (p - *dest))) {
                    169:                *p++ = PHP_UU_DEC(*s) << 2 | PHP_UU_DEC(*(s + 1)) >> 4;
                    170:                if (len > 1) {
                    171:                        *p++ = PHP_UU_DEC(*(s + 1)) << 4 | PHP_UU_DEC(*(s + 2)) >> 2;
                    172:                        if (len > 2) {
                    173:                                *p++ = PHP_UU_DEC(*(s + 2)) << 6 | PHP_UU_DEC(*(s + 3));
                    174:                        }
                    175:                }
                    176:        }
                    177: 
                    178:        *(*dest + total_len) = '\0';
                    179: 
                    180:        return total_len;
                    181: 
                    182: err:
                    183:        efree(*dest);
                    184:        return -1;
                    185: }
                    186: /* }}} */
                    187: 
                    188: /* {{{ proto string convert_uuencode(string data) 
                    189:    uuencode a string */
                    190: PHP_FUNCTION(convert_uuencode)
                    191: {
                    192:        char *src, *dst;
                    193:        int src_len, dst_len;
                    194: 
                    195:        if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &src, &src_len) == FAILURE || src_len < 1) {
                    196:                RETURN_FALSE;
                    197:        }
                    198: 
                    199:        dst_len = php_uuencode(src, src_len, &dst);
                    200: 
                    201:        RETURN_STRINGL(dst, dst_len, 0);
                    202: }
                    203: /* }}} */
                    204: 
                    205: /* {{{ proto string convert_uudecode(string data)
                    206:    decode a uuencoded string */
                    207: PHP_FUNCTION(convert_uudecode)
                    208: {
                    209:        char *src, *dst;
                    210:        int src_len, dst_len;
                    211: 
                    212:        if (zend_parse_parameters(ZEND_NUM_ARGS() TSRMLS_CC, "s", &src, &src_len) == FAILURE || src_len < 1) {
                    213:                RETURN_FALSE;
                    214:        }
                    215: 
                    216:        dst_len = php_uudecode(src, src_len, &dst);
                    217:        if (dst_len < 0) {
                    218:                php_error_docref(NULL TSRMLS_CC, E_WARNING, "The given parameter is not a valid uuencoded string");
                    219:                RETURN_FALSE;
                    220:        }
                    221: 
                    222:        RETURN_STRINGL(dst, dst_len, 0);
                    223: }
                    224: /* }}} */
                    225: 
                    226: /*
                    227:  * Local variables:
                    228:  * tab-width: 4
                    229:  * c-basic-offset: 4
                    230:  * End:
                    231:  * vim600: noet sw=4 ts=4 fdm=marker
                    232:  * vim<600: noet sw=4 ts=4
                    233:  */

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