/*

   +----------------------------------------------------------------------+

   | Copyright © The PHP Group and Contributors.                          |

   +----------------------------------------------------------------------+

   | This source file is subject to the Modified BSD License that is      |

   | bundled with this package in the file LICENSE, and is available      |

   | through the World Wide Web at <https://www.php.net/license/>.        |

   |                                                                      |

   | SPDX-License-Identifier: BSD-3-Clause                                |

   +----------------------------------------------------------------------+

   | 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);

}

/* }}} */