pigweed / third_party / boringssl / boringssl / 95c29f3cd1f6c08c6c0927868683392eea727ccb / . / crypto / asn1 / a_utf8.c

/* 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 <openssl/asn1.h> | |

#include <openssl/err.h> | |

#include <openssl/mem.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, unsigned long *val) | |

{ | |

const unsigned char *p; | |

unsigned long 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 = ((unsigned long)(*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 = ((unsigned long)(*p++ & 0x3)) << 24; | |

value |= ((unsigned long)(*p++ & 0x3f)) << 18; | |

value |= ((unsigned long)(*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 = ((unsigned long)(*p++ & 0x1)) << 30; | |

value |= ((unsigned long)(*p++ & 0x3f)) << 24; | |

value |= ((unsigned long)(*p++ & 0x3f)) << 18; | |

value |= ((unsigned long)(*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, unsigned long 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; | |

} |