text: /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
   * All rights reserved.
   *
   * This package is an SSL implementation written
   * by Eric Young (eay@cryptsoft.com).
   * The implementation was written so as to conform with Netscapes SSL.
   *
   * This library is free for commercial and non-commercial use as long as
   * the following conditions are aheared to.  The following conditions
   * apply to all code found in this distribution, be it the RC4, RSA,
   * lhash, DES, etc., code; not just the SSL code.  The SSL documentation
   * included with this distribution is covered by the same copyright terms
   * except that the holder is Tim Hudson (tjh@cryptsoft.com).
   *
   * Copyright remains Eric Young's, and as such any Copyright notices in
   * the code are not to be removed.
   * If this package is used in a product, Eric Young should be given attribution
   * as the author of the parts of the library used.
   * This can be in the form of a textual message at program startup or
   * in documentation (online or textual) provided with the package.
   *
   * 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 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 cryptographic software written by
   *     Eric Young (eay@cryptsoft.com)"
   *    The word 'cryptographic' can be left out if the rouines from the library
   *    being used are not cryptographic related :-).
   * 4. If you include any Windows specific code (or a derivative thereof) from
   *    the apps directory (application code) you must include an acknowledgement:
   *    "This product includes software written by Tim Hudson (tjh@cryptsoft.com)"
   *
   * THIS SOFTWARE IS PROVIDED BY ERIC YOUNG ``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 AUTHOR 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.
   *
   * The licence and distribution terms for any publically available version or
   * derivative of this code cannot be changed.  i.e. this code cannot simply be
   * copied and put under another distribution licence
   * [including the GNU Public Licence.] */
  
  #include <CJWTKitBoringSSL_asn1.h>
  
  #include <CJWTKitBoringSSL_err.h>
  #include <CJWTKitBoringSSL_mem.h>
  
  #include "asn1_locl.h"
  
  /* UTF8 utilities */
  
  /*
   * This parses a UTF8 string one character at a time. It is passed a pointer
   * to the string and the length of the string. It sets 'value' to the value
   * of the current character. It returns the number of characters read or a
   * negative error code: -1 = string too short -2 = illegal character -3 =
   * subsequent characters not of the form 10xxxxxx -4 = character encoded
   * incorrectly (not minimal length).
   */
  
  int UTF8_getc(const unsigned char *str, int len, uint32_t *val)
  {
      const unsigned char *p;
      uint32_t value;
      int ret;
      if (len <= 0)
          return 0;
      p = str;
  
      /* Check syntax and work out the encoded value (if correct) */
      if ((*p & 0x80) == 0) {
          value = *p++ & 0x7f;
          ret = 1;
      } else if ((*p & 0xe0) == 0xc0) {
          if (len < 2)
              return -1;
          if ((p[1] & 0xc0) != 0x80)
              return -3;
          value = (*p++ & 0x1f) << 6;
          value |= *p++ & 0x3f;
          if (value < 0x80)
              return -4;
          ret = 2;
      } else if ((*p & 0xf0) == 0xe0) {
          if (len < 3)
              return -1;
          if (((p[1] & 0xc0) != 0x80)
              || ((p[2] & 0xc0) != 0x80))
              return -3;
          value = (*p++ & 0xf) << 12;
          value |= (*p++ & 0x3f) << 6;
          value |= *p++ & 0x3f;
          if (value < 0x800)
              return -4;
          ret = 3;
      } else if ((*p & 0xf8) == 0xf0) {
          if (len < 4)
              return -1;
          if (((p[1] & 0xc0) != 0x80)
              || ((p[2] & 0xc0) != 0x80)
              || ((p[3] & 0xc0) != 0x80))
              return -3;
          value = ((uint32_t)(*p++ & 0x7)) << 18;
          value |= (*p++ & 0x3f) << 12;
          value |= (*p++ & 0x3f) << 6;
          value |= *p++ & 0x3f;
          if (value < 0x10000)
              return -4;
          ret = 4;
      } else if ((*p & 0xfc) == 0xf8) {
          if (len < 5)
              return -1;
          if (((p[1] & 0xc0) != 0x80)
              || ((p[2] & 0xc0) != 0x80)
              || ((p[3] & 0xc0) != 0x80)
              || ((p[4] & 0xc0) != 0x80))
              return -3;
          value = ((uint32_t)(*p++ & 0x3)) << 24;
          value |= ((uint32_t)(*p++ & 0x3f)) << 18;
          value |= ((uint32_t)(*p++ & 0x3f)) << 12;
          value |= (*p++ & 0x3f) << 6;
          value |= *p++ & 0x3f;
          if (value < 0x200000)
              return -4;
          ret = 5;
      } else if ((*p & 0xfe) == 0xfc) {
          if (len < 6)
              return -1;
          if (((p[1] & 0xc0) != 0x80)
              || ((p[2] & 0xc0) != 0x80)
              || ((p[3] & 0xc0) != 0x80)
              || ((p[4] & 0xc0) != 0x80)
              || ((p[5] & 0xc0) != 0x80))
              return -3;
          value = ((uint32_t)(*p++ & 0x1)) << 30;
          value |= ((uint32_t)(*p++ & 0x3f)) << 24;
          value |= ((uint32_t)(*p++ & 0x3f)) << 18;
          value |= ((uint32_t)(*p++ & 0x3f)) << 12;
          value |= (*p++ & 0x3f) << 6;
          value |= *p++ & 0x3f;
          if (value < 0x4000000)
              return -4;
          ret = 6;
      } else
          return -2;
      *val = value;
      return ret;
  }
  
  /*
   * This takes a character 'value' and writes the UTF8 encoded value in 'str'
   * where 'str' is a buffer containing 'len' characters. Returns the number of
   * characters written or -1 if 'len' is too small. 'str' can be set to NULL
   * in which case it just returns the number of characters. It will need at
   * most 6 characters.
   */
  
  int UTF8_putc(unsigned char *str, int len, uint32_t value)
  {
      if (!str)
          len = 6;                /* Maximum we will need */
      else if (len <= 0)
          return -1;
      if (value < 0x80) {
          if (str)
              *str = (unsigned char)value;
          return 1;
      }
      if (value < 0x800) {
          if (len < 2)
              return -1;
          if (str) {
              *str++ = (unsigned char)(((value >> 6) & 0x1f) | 0xc0);
              *str = (unsigned char)((value & 0x3f) | 0x80);
          }
          return 2;
      }
      if (value < 0x10000) {
          if (len < 3)
              return -1;
          if (str) {
              *str++ = (unsigned char)(((value >> 12) & 0xf) | 0xe0);
              *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
              *str = (unsigned char)((value & 0x3f) | 0x80);
          }
          return 3;
      }
      if (value < 0x200000) {
          if (len < 4)
              return -1;
          if (str) {
              *str++ = (unsigned char)(((value >> 18) & 0x7) | 0xf0);
              *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80);
              *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
              *str = (unsigned char)((value & 0x3f) | 0x80);
          }
          return 4;
      }
      if (value < 0x4000000) {
          if (len < 5)
              return -1;
          if (str) {
              *str++ = (unsigned char)(((value >> 24) & 0x3) | 0xf8);
              *str++ = (unsigned char)(((value >> 18) & 0x3f) | 0x80);
              *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80);
              *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
              *str = (unsigned char)((value & 0x3f) | 0x80);
          }
          return 5;
      }
      if (len < 6)
          return -1;
      if (str) {
          *str++ = (unsigned char)(((value >> 30) & 0x1) | 0xfc);
          *str++ = (unsigned char)(((value >> 24) & 0x3f) | 0x80);
          *str++ = (unsigned char)(((value >> 18) & 0x3f) | 0x80);
          *str++ = (unsigned char)(((value >> 12) & 0x3f) | 0x80);
          *str++ = (unsigned char)(((value >> 6) & 0x3f) | 0x80);
          *str = (unsigned char)((value & 0x3f) | 0x80);
      }
      return 6;
  }
  