Steve Karg
1235 lines
33 KiB
C
1235 lines
33 KiB
C
/**
|
|
* @file
|
|
* @brief BACnet bitstring, octectstring, and characterstring encode
|
|
* and decode functions
|
|
* @author Steve Karg <skarg@users.sourceforge.net>
|
|
* @date 2004
|
|
* @copyright SPDX-License-Identifier: GPL-2.0-or-later WITH GCC-exception-2.0
|
|
*/
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <limits.h>
|
|
#include <ctype.h>
|
|
/* BACnet Stack defines - first */
|
|
#include "bacnet/bacdef.h"
|
|
/* BACnet Stack API */
|
|
#include "bacnet/bacstr.h"
|
|
|
|
#ifndef BACNET_STRING_UTF8_VALIDATION
|
|
#define BACNET_STRING_UTF8_VALIDATION 1
|
|
#endif
|
|
|
|
/* check the limits of bitstring capacity */
|
|
#if ((MAX_BITSTRING_BYTES * 8) > (UINT8_MAX + 1))
|
|
#error "MAX_BITSTRING_BYTES cannot exceed 32!"
|
|
#endif
|
|
#if (((MAX_BITSTRING_BYTES * 8) > UINT8_MAX) && (UINT_MAX <= UINT8_MAX))
|
|
#error "MAX_BITSTRING_BYTES cannot exceed 31!"
|
|
#endif
|
|
|
|
/**
|
|
* Initialize a bit string.
|
|
*
|
|
* @param bit_string Pointer to the bit string structure.
|
|
*/
|
|
void bitstring_init(BACNET_BIT_STRING *bit_string)
|
|
{
|
|
unsigned i;
|
|
|
|
if (bit_string) {
|
|
bit_string->bits_used = 0;
|
|
for (i = 0; i < MAX_BITSTRING_BYTES; i++) {
|
|
bit_string->value[i] = 0;
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Set bits in the bit string.
|
|
*
|
|
* @param bit_string Pointer to the bit string structure.
|
|
* @param bit_number Number of the bit [0..(MAX_BITSTRING_BYTES*8)-1]
|
|
* @param value Value 0/1
|
|
*/
|
|
void bitstring_set_bit(
|
|
BACNET_BIT_STRING *bit_string, uint8_t bit_number, bool value)
|
|
{
|
|
unsigned byte_number = bit_number / 8;
|
|
uint8_t bit_mask = 1;
|
|
|
|
if (bit_string) {
|
|
if (byte_number < MAX_BITSTRING_BYTES) {
|
|
/* set max bits used */
|
|
if (bit_string->bits_used < (bit_number + 1)) {
|
|
bit_string->bits_used = bit_number + 1;
|
|
}
|
|
bit_mask = bit_mask << (bit_number - (byte_number * 8));
|
|
if (value) {
|
|
bit_string->value[byte_number] |= bit_mask;
|
|
} else {
|
|
bit_string->value[byte_number] &= (~(bit_mask));
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Return the value of a single bit
|
|
* out of the bit string.
|
|
*
|
|
* @param bit_string Pointer to the bit string structure.
|
|
* @param bit_number Number of the bit [0..(MAX_BITSTRING_BYTES*8)-1]
|
|
*
|
|
* @return Value 0/1
|
|
*/
|
|
bool bitstring_bit(BACNET_BIT_STRING *bit_string, uint8_t bit_number)
|
|
{
|
|
bool value = false;
|
|
unsigned byte_number = bit_number / 8;
|
|
uint8_t bit_mask = 1;
|
|
|
|
if (bit_string) {
|
|
if (bit_number < (MAX_BITSTRING_BYTES * 8)) {
|
|
bit_mask = bit_mask << (bit_number - (byte_number * 8));
|
|
if (bit_string->value[byte_number] & bit_mask) {
|
|
value = true;
|
|
}
|
|
}
|
|
}
|
|
|
|
return value;
|
|
}
|
|
|
|
/**
|
|
* Return the number of bits used.
|
|
*
|
|
* @param bit_string Pointer to the bit string structure.
|
|
*
|
|
* @return Bits used [0..(MAX_BITSTRING_BYTES*8)-1]
|
|
*/
|
|
uint8_t bitstring_bits_used(BACNET_BIT_STRING *bit_string)
|
|
{
|
|
return (bit_string ? bit_string->bits_used : 0);
|
|
}
|
|
|
|
/**
|
|
* Returns the number of bytes that a bit string is using.
|
|
*
|
|
* @param bit_string Pointer to the bit string structure.
|
|
*
|
|
* @return Bytes used [0..MAX_BITSTRING_BYTES]
|
|
*/
|
|
uint8_t bitstring_bytes_used(BACNET_BIT_STRING *bit_string)
|
|
{
|
|
uint8_t len = 0; /* return value */
|
|
uint8_t used_bytes = 0;
|
|
uint8_t last_bit = 0;
|
|
|
|
if (bit_string && bit_string->bits_used) {
|
|
last_bit = bit_string->bits_used - 1;
|
|
used_bytes = last_bit / 8;
|
|
/* add one for the first byte */
|
|
used_bytes++;
|
|
len = used_bytes;
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
/**
|
|
* Returns an octet at the given bit position.
|
|
*
|
|
* @param bit_string Pointer to the bit string structure.
|
|
* @param octet_index Byte index of the octet [0..MAX_BITSTRING_BYTES-1]
|
|
*
|
|
* @return Value of the octet.
|
|
*/
|
|
uint8_t bitstring_octet(BACNET_BIT_STRING *bit_string, uint8_t octet_index)
|
|
{
|
|
uint8_t octet = 0;
|
|
|
|
if (bit_string) {
|
|
if (octet_index < MAX_BITSTRING_BYTES) {
|
|
octet = bit_string->value[octet_index];
|
|
}
|
|
}
|
|
|
|
return octet;
|
|
}
|
|
|
|
/**
|
|
* Set an octet at the given bit position.
|
|
*
|
|
* @param bit_string Pointer to the bit string structure.
|
|
* @param index Byte index of the octet [0..MAX_BITSTRING_BYTES-1]
|
|
* @param octet Octet value
|
|
*
|
|
* @return true on success, false otherwise.
|
|
*/
|
|
bool bitstring_set_octet(
|
|
BACNET_BIT_STRING *bit_string, uint8_t index, uint8_t octet)
|
|
{
|
|
bool status = false;
|
|
|
|
if (bit_string) {
|
|
if (index < MAX_BITSTRING_BYTES) {
|
|
bit_string->value[index] = octet;
|
|
status = true;
|
|
}
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* Write the amount of bits used in the bit
|
|
* string structure.
|
|
*
|
|
* @param bit_string Pointer to the bit string structure.
|
|
* @param bytes_used Count of bytes used.
|
|
* @param unused_bits Count of remaining unused bits in
|
|
* the last byte.
|
|
*
|
|
* @return true on success or false on error.
|
|
*/
|
|
bool bitstring_set_bits_used(
|
|
BACNET_BIT_STRING *bit_string, uint8_t bytes_used, uint8_t unused_bits)
|
|
{
|
|
bool status = false;
|
|
|
|
if (bit_string && bytes_used) {
|
|
bit_string->bits_used = bytes_used * 8;
|
|
bit_string->bits_used -= unused_bits;
|
|
status = true;
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* Return the capacity of the bit string.
|
|
*
|
|
* @param bit_string Pointer to the bit string structure.
|
|
*
|
|
* @return Capacitiy in bits [0..(MAX_BITSTRING_BYTES*8)]
|
|
*/
|
|
unsigned bitstring_bits_capacity(BACNET_BIT_STRING *bit_string)
|
|
{
|
|
if (bit_string) {
|
|
if ((MAX_BITSTRING_BYTES * 8) <= (UINT8_MAX + 1)) {
|
|
return (MAX_BITSTRING_BYTES * 8);
|
|
} else {
|
|
return (UINT8_MAX + 1);
|
|
}
|
|
} else {
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* Copy bits from one bit string to another.
|
|
*
|
|
* @param dest Pointer to the destination bit string structure.
|
|
* @param src Pointer to the source bit string structure.
|
|
*
|
|
* @return true on success, false otherwise.
|
|
*/
|
|
bool bitstring_copy(BACNET_BIT_STRING *dest, BACNET_BIT_STRING *src)
|
|
{
|
|
unsigned i;
|
|
bool status = false;
|
|
|
|
if (dest && src) {
|
|
dest->bits_used = src->bits_used;
|
|
for (i = 0; i < MAX_BITSTRING_BYTES; i++) {
|
|
dest->value[i] = src->value[i];
|
|
}
|
|
status = true;
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* Returns true if the same length and contents.
|
|
*
|
|
* @param bitstring1 Pointer to the first bit string structure.
|
|
* @param bitstring2 Pointer to the second bit string structure.
|
|
*
|
|
* @return true if the content of both bit strings are
|
|
* the same, false otherwise.
|
|
*/
|
|
bool bitstring_same(
|
|
BACNET_BIT_STRING *bitstring1, BACNET_BIT_STRING *bitstring2)
|
|
{
|
|
int i; /* loop counter */
|
|
int bytes_used = 0;
|
|
uint8_t compare_mask = 0;
|
|
|
|
if (bitstring1 && bitstring2) {
|
|
bytes_used = (int)(bitstring1->bits_used / 8);
|
|
if ((bitstring1->bits_used == bitstring2->bits_used) &&
|
|
(bytes_used <= MAX_BITSTRING_BYTES)) {
|
|
/* compare fully used bytes */
|
|
for (i = 0; i < bytes_used; i++) {
|
|
if (bitstring1->value[i] != bitstring2->value[i]) {
|
|
return false;
|
|
}
|
|
}
|
|
/* compare only the relevant bits of last partly used byte */
|
|
compare_mask = 0xFF >> (8 - (bitstring1->bits_used % 8));
|
|
if ((bitstring1->value[bytes_used] & compare_mask) !=
|
|
(bitstring2->value[bytes_used] & compare_mask)) {
|
|
return false;
|
|
} else {
|
|
return true;
|
|
}
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Converts an null terminated ASCII string to an bitstring.
|
|
*
|
|
* Expects "1,0,1,0,1,1" or "101011" as the bits
|
|
*
|
|
* @param bit_string Pointer to the bit string structure.
|
|
* @param ascii Pointer to a zero terminated string, made up from
|
|
* '0' and '1' like "010010011", that shall be
|
|
* converted into a bit string.
|
|
*
|
|
* @return true if successfully converted and fits; false if too long.
|
|
*/
|
|
bool bitstring_init_ascii(BACNET_BIT_STRING *bit_string, const char *ascii)
|
|
{
|
|
bool status = false; /* return value */
|
|
unsigned index = 0; /* offset into buffer */
|
|
uint8_t bit_number = 0;
|
|
|
|
if (bit_string) {
|
|
bitstring_init(bit_string);
|
|
if (ascii[0] == 0) {
|
|
/* nothing to decode, so success! */
|
|
status = true;
|
|
} else {
|
|
while (ascii[index] != 0) {
|
|
if (bit_number >= bitstring_bits_capacity(bit_string)) {
|
|
/* too long of a string */
|
|
status = false;
|
|
break;
|
|
}
|
|
if (ascii[index] == '1') {
|
|
bitstring_set_bit(bit_string, bit_number, true);
|
|
bit_number++;
|
|
status = true;
|
|
} else if (ascii[index] == '0') {
|
|
bitstring_set_bit(bit_string, bit_number, false);
|
|
bit_number++;
|
|
status = true;
|
|
} else {
|
|
/* skip non-numeric or alpha */
|
|
index++;
|
|
continue;
|
|
}
|
|
/* next character */
|
|
index++;
|
|
}
|
|
}
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
#define CHARACTER_STRING_CAPACITY (MAX_CHARACTER_STRING_BYTES - 1)
|
|
/**
|
|
* Initialize a BACnet characater string.
|
|
* Returns false if the string exceeds capacity.
|
|
* Initialize by using value=NULL
|
|
*
|
|
* @param char_string Pointer to the BACnet string
|
|
* @param encoding Encoding that shall be used
|
|
* like CHARACTER_UTF8
|
|
* @param value C-string used to initialize the object
|
|
* @param length C-String length in characters.
|
|
*
|
|
* @return true on success, false if the string exceeds capacity.
|
|
*/
|
|
bool characterstring_init(BACNET_CHARACTER_STRING *char_string,
|
|
uint8_t encoding,
|
|
const char *value,
|
|
size_t length)
|
|
{
|
|
bool status = false; /* return value */
|
|
size_t i; /* counter */
|
|
|
|
if (char_string) {
|
|
char_string->length = 0;
|
|
char_string->encoding = encoding;
|
|
/* save a byte at the end for NULL -
|
|
note: assumes printable characters */
|
|
if (length <= CHARACTER_STRING_CAPACITY) {
|
|
if (value) {
|
|
for (i = 0; i < MAX_CHARACTER_STRING_BYTES; i++) {
|
|
if (i < length) {
|
|
char_string->value[char_string->length] = value[i];
|
|
char_string->length++;
|
|
} else {
|
|
char_string->value[i] = 0;
|
|
}
|
|
}
|
|
} else {
|
|
for (i = 0; i < MAX_CHARACTER_STRING_BYTES; i++) {
|
|
char_string->value[i] = 0;
|
|
}
|
|
}
|
|
status = true;
|
|
}
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* Initialize a BACnet characater string.
|
|
* Returns false if the string exceeds capacity.
|
|
* Initialize by using value=NULL
|
|
*
|
|
* @param char_string Pointer to the BACnet string
|
|
* @param value C-string used to initialize the object
|
|
* @param tmax C-String length in characters.
|
|
*
|
|
* @return true/false
|
|
*/
|
|
bool characterstring_init_ansi_safe(
|
|
BACNET_CHARACTER_STRING *char_string, const char *value, size_t tmax)
|
|
{
|
|
return characterstring_init(char_string, CHARACTER_ANSI_X34, value,
|
|
value ? bacnet_strnlen(value, tmax) : 0);
|
|
}
|
|
|
|
/**
|
|
* Initialize a BACnet characater string.
|
|
* Returns false if the string exceeds capacity.
|
|
* Initialize by using value=NULL
|
|
*
|
|
* @param char_string Pointer to the BACnet string
|
|
* @param value C-string used to initialize the object
|
|
*
|
|
* @return true/false
|
|
*/
|
|
bool characterstring_init_ansi(
|
|
BACNET_CHARACTER_STRING *char_string, const char *value)
|
|
{
|
|
return characterstring_init(
|
|
char_string, CHARACTER_ANSI_X34, value, value ? strlen(value) : 0);
|
|
}
|
|
|
|
/**
|
|
* Copy a character string.
|
|
*
|
|
* @param dest Pointer to the destination string.
|
|
* @param src Pointer to the source string.
|
|
*
|
|
* @return true/false
|
|
*/
|
|
bool characterstring_copy(
|
|
BACNET_CHARACTER_STRING *dest, BACNET_CHARACTER_STRING *src)
|
|
{
|
|
if (dest && src) {
|
|
return characterstring_init(dest, characterstring_encoding(src),
|
|
characterstring_value(src), characterstring_length(src));
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Copy a character string into a C-string.
|
|
*
|
|
* @param dest Pointer to the destination C-string buffer.
|
|
* @param dest_max_len Size of the destination C-string buffer.
|
|
* @param src Pointer to the source BACnet string.
|
|
*
|
|
* @return true/false
|
|
*/
|
|
bool characterstring_ansi_copy(
|
|
char *dest, size_t dest_max_len, BACNET_CHARACTER_STRING *src)
|
|
{
|
|
size_t i; /* counter */
|
|
|
|
if (dest && src) {
|
|
if ((src->encoding == CHARACTER_ANSI_X34) &&
|
|
(src->length < dest_max_len)) {
|
|
for (i = 0; i < dest_max_len; i++) {
|
|
if (i < src->length) {
|
|
dest[i] = src->value[i];
|
|
} else {
|
|
dest[i] = 0;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/**
|
|
* Returns true if the character encoding and string
|
|
* contents are the same.
|
|
*
|
|
* @param dest Pointer to the first string to test.
|
|
* @param src Pointer to the second string to test.
|
|
*
|
|
* @return true if the character encoding and string contents are the same
|
|
*/
|
|
bool characterstring_same(
|
|
BACNET_CHARACTER_STRING *dest, BACNET_CHARACTER_STRING *src)
|
|
{
|
|
size_t i; /* counter */
|
|
bool same_status = false;
|
|
|
|
if (src && dest) {
|
|
if ((src->encoding == dest->encoding) &&
|
|
(src->length == dest->length) &&
|
|
(src->length <= MAX_CHARACTER_STRING_BYTES)) {
|
|
same_status = true;
|
|
for (i = 0; i < src->length; i++) {
|
|
if (src->value[i] != dest->value[i]) {
|
|
same_status = false;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
} else if (src) {
|
|
if (src->length == 0) {
|
|
same_status = true;
|
|
}
|
|
} else if (dest) {
|
|
if (dest->length == 0) {
|
|
same_status = true;
|
|
}
|
|
}
|
|
|
|
return same_status;
|
|
}
|
|
|
|
/**
|
|
* Returns true if the BACnet string and the C-string
|
|
* contents are the same.
|
|
*
|
|
* @param dest Pointer to the first string to test.
|
|
* @param src Pointer to the second string to test.
|
|
*
|
|
* @return true if the character encoding and string contents are the same
|
|
*/
|
|
bool characterstring_ansi_same(BACNET_CHARACTER_STRING *dest, const char *src)
|
|
{
|
|
size_t i; /* counter */
|
|
bool same_status = false;
|
|
|
|
if (src && dest) {
|
|
if ((dest->encoding == CHARACTER_ANSI_X34) &&
|
|
(dest->length == strlen(src)) &&
|
|
(dest->length <= MAX_CHARACTER_STRING_BYTES)) {
|
|
same_status = true;
|
|
for (i = 0; i < dest->length; i++) {
|
|
if (src[i] != dest->value[i]) {
|
|
same_status = false;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
/* NULL matches an empty string in our world */
|
|
else if (src) {
|
|
if (strlen(src) == 0) {
|
|
same_status = true;
|
|
}
|
|
} else if (dest) {
|
|
if (dest->length == 0) {
|
|
same_status = true;
|
|
}
|
|
}
|
|
|
|
return same_status;
|
|
}
|
|
|
|
/**
|
|
* Append some characters to the end of the characterstring
|
|
*
|
|
* @param char_string Pointer to the BACnet string to which
|
|
* the content of the C-string shall be added.
|
|
* @param value Pointer to the C-String to be added.
|
|
* @param length Count of characters to add.
|
|
*
|
|
* @param src Pointer to the first string to test.
|
|
*
|
|
* @return false if the string exceeds capacity.
|
|
*/
|
|
bool characterstring_append(
|
|
BACNET_CHARACTER_STRING *char_string, const char *value, size_t length)
|
|
{
|
|
size_t i; /* counter */
|
|
bool status = false; /* return value */
|
|
|
|
if (char_string) {
|
|
if ((length + char_string->length) <= CHARACTER_STRING_CAPACITY) {
|
|
for (i = 0; i < length; i++) {
|
|
char_string->value[char_string->length] = value[i];
|
|
char_string->length++;
|
|
}
|
|
status = true;
|
|
}
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* @brief This function sets a new length without changing
|
|
* the value. If length exceeds capacity, no modification
|
|
* happens and function returns false.
|
|
*
|
|
* @return true on success, false if the string exceeds
|
|
* capacity.
|
|
*/
|
|
bool characterstring_truncate(
|
|
BACNET_CHARACTER_STRING *char_string, size_t length)
|
|
{
|
|
bool status = false; /* return value */
|
|
|
|
if (char_string) {
|
|
if (length <= CHARACTER_STRING_CAPACITY) {
|
|
char_string->length = length;
|
|
status = true;
|
|
}
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* @brief Returns the pointer to the C-string for the given BACnet string.
|
|
*
|
|
* @param char_string Pointer to the character string.
|
|
*
|
|
* @return Pointer to a zero-terminated C-string.
|
|
*/
|
|
char *characterstring_value(BACNET_CHARACTER_STRING *char_string)
|
|
{
|
|
char *value = NULL;
|
|
|
|
if (char_string) {
|
|
value = char_string->value;
|
|
}
|
|
|
|
return value;
|
|
}
|
|
|
|
/**
|
|
* @brief Returns the length for the given BACnet string.
|
|
*
|
|
* @param char_string Pointer to the character string.
|
|
*
|
|
* @return Length of the character string, but
|
|
* maximum MAX_CHARACTER_STRING_BYTES.
|
|
*/
|
|
size_t characterstring_length(BACNET_CHARACTER_STRING *char_string)
|
|
{
|
|
size_t length = 0;
|
|
|
|
if (char_string) {
|
|
length = char_string->length;
|
|
|
|
/* Length within bounds? */
|
|
if (length > CHARACTER_STRING_CAPACITY) {
|
|
length = CHARACTER_STRING_CAPACITY;
|
|
}
|
|
}
|
|
|
|
return length;
|
|
}
|
|
|
|
/**
|
|
* @brief Returns the possible capacity for the given BACnet string.
|
|
*
|
|
* @param char_string Pointer to the character string.
|
|
*
|
|
* @return MAX_CHARACTER_STRING_BYTES
|
|
*/
|
|
size_t characterstring_capacity(BACNET_CHARACTER_STRING *char_string)
|
|
{
|
|
size_t length = 0;
|
|
|
|
if (char_string) {
|
|
length = CHARACTER_STRING_CAPACITY;
|
|
}
|
|
|
|
return length;
|
|
}
|
|
|
|
/**
|
|
* @brief Returns the character encoding for the given BACnet string.
|
|
*
|
|
* @param char_string Pointer to the character string.
|
|
*
|
|
* @return Encoding, like CHARACTER_ANSI_X34
|
|
*/
|
|
uint8_t characterstring_encoding(BACNET_CHARACTER_STRING *char_string)
|
|
{
|
|
uint8_t encoding = 0;
|
|
|
|
if (char_string) {
|
|
encoding = char_string->encoding;
|
|
}
|
|
|
|
return encoding;
|
|
}
|
|
|
|
/**
|
|
* @brief Set the character encoding for the given BACnet string.
|
|
*
|
|
* @param char_string Pointer to the character string.
|
|
* @param Encoding, like CHARACTER_ANSI_X34
|
|
*
|
|
* @return true/false on error
|
|
*/
|
|
bool characterstring_set_encoding(
|
|
BACNET_CHARACTER_STRING *char_string, uint8_t encoding)
|
|
{
|
|
bool status = false;
|
|
|
|
if (char_string) {
|
|
char_string->encoding = encoding;
|
|
status = true;
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* @brief Returns true if string is printable.
|
|
*
|
|
* Used to assist in the requirement that
|
|
* "The set of characters used in the Object_Name shall be
|
|
* restricted to printable characters."
|
|
*
|
|
* Printable character: a character that represents a printable
|
|
* symbol as opposed to a device control character. These
|
|
* include, but are not limited to, upper- and lowercase letters,
|
|
* punctuation marks, and mathematical symbols. The exact set
|
|
* depends upon the character set being used. In ANSI X3.4 the
|
|
* printable characters are represented by single octets in the range
|
|
* X'20' - X'7E'.
|
|
*
|
|
* @param char_string Pointer to the character string.
|
|
*
|
|
* @return true/false on error
|
|
*/
|
|
bool characterstring_printable(BACNET_CHARACTER_STRING *char_string)
|
|
{
|
|
bool status = false; /* return value */
|
|
size_t i; /* counter */
|
|
size_t imax;
|
|
char chr;
|
|
|
|
if (char_string) {
|
|
if (char_string->encoding == CHARACTER_ANSI_X34) {
|
|
status = true;
|
|
imax = char_string->length;
|
|
if (imax > CHARACTER_STRING_CAPACITY) {
|
|
imax = CHARACTER_STRING_CAPACITY;
|
|
}
|
|
for (i = 0; i < imax; i++) {
|
|
chr = char_string->value[i];
|
|
if ((chr < 0x20) || (chr > 0x7E)) {
|
|
status = false;
|
|
break;
|
|
}
|
|
}
|
|
} else {
|
|
status = true;
|
|
}
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
#if BACNET_STRING_UTF8_VALIDATION
|
|
/* Basic UTF-8 manipulation routines
|
|
* by Jeff Bezanson
|
|
* placed in the public domain Fall 2005 */
|
|
static const char trailingBytesForUTF8[256] = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
|
|
0, 0, 0, 0, 0, 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2, 2,
|
|
2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, 5, 5, 5, 5 };
|
|
|
|
/**
|
|
* @brief Based on the valid_utf8 routine from the PCRE library by Philip Hazel
|
|
* length is in bytes, since without knowing whether the string is valid
|
|
* it's hard to know how many characters there are!
|
|
*
|
|
* @param str Pointer to the character string.
|
|
* @param length Count of bytes to check. The count of bytes
|
|
* does not necessarily match the count of chars.
|
|
*
|
|
* @return true if the string is valid, false otherwise.
|
|
*/
|
|
bool utf8_isvalid(const char *str, size_t length)
|
|
{
|
|
const unsigned char *p, *pend;
|
|
unsigned char c;
|
|
size_t ab;
|
|
|
|
/* An empty string is valid. */
|
|
if (length == 0) {
|
|
return true;
|
|
}
|
|
/* Check pointer. */
|
|
if (!str) {
|
|
return false;
|
|
}
|
|
/* Check characters. */
|
|
pend = (unsigned char *)str + length;
|
|
for (p = (const unsigned char *)str; p < pend; p++) {
|
|
c = *p;
|
|
/* null in middle of string */
|
|
if (c == 0) {
|
|
return false;
|
|
}
|
|
/* ASCII character */
|
|
if (c < 128) {
|
|
continue;
|
|
}
|
|
if ((c & 0xc0) != 0xc0) {
|
|
return false;
|
|
}
|
|
ab = (size_t)trailingBytesForUTF8[c];
|
|
if (length < ab) {
|
|
return false;
|
|
}
|
|
length -= ab;
|
|
|
|
p++;
|
|
/* Check top bits in the second byte */
|
|
if ((*p & 0xc0) != 0x80) {
|
|
return false;
|
|
}
|
|
/* Check for overlong sequences for each different length */
|
|
switch (ab) {
|
|
/* Check for xx00 000x */
|
|
case 1:
|
|
if ((c & 0x3e) == 0) {
|
|
return false;
|
|
}
|
|
continue; /* We know there aren't any more bytes to check */
|
|
|
|
/* Check for 1110 0000, xx0x xxxx */
|
|
case 2:
|
|
if (c == 0xe0 && (*p & 0x20) == 0) {
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
/* Check for 1111 0000, xx00 xxxx */
|
|
case 3:
|
|
if (c == 0xf0 && (*p & 0x30) == 0) {
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
/* Check for 1111 1000, xx00 0xxx */
|
|
case 4:
|
|
if (c == 0xf8 && (*p & 0x38) == 0) {
|
|
return false;
|
|
}
|
|
break;
|
|
|
|
/* Check for leading 0xfe or 0xff,
|
|
and then for 1111 1100, xx00 00xx */
|
|
case 5:
|
|
if (c == 0xfe || c == 0xff || (c == 0xfc && (*p & 0x3c) == 0)) {
|
|
return false;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
/* Check for valid bytes after the 2nd, if any; all must start 10 */
|
|
while (--ab > 0) {
|
|
if ((*(++p) & 0xc0) != 0x80) {
|
|
return false;
|
|
}
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
#else
|
|
bool utf8_isvalid(const char *str, size_t length)
|
|
{
|
|
(void)str;
|
|
(void)length;
|
|
return true;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* Check if the character string is valid or not.
|
|
*
|
|
* @param char_string Pointer to the character string.
|
|
*
|
|
* @return true if the string is valid, false otherwise.
|
|
*/
|
|
bool characterstring_valid(BACNET_CHARACTER_STRING *char_string)
|
|
{
|
|
bool valid = false; /* return value */
|
|
|
|
if (char_string) {
|
|
if (char_string->encoding < MAX_CHARACTER_STRING_ENCODING) {
|
|
if (char_string->encoding == CHARACTER_UTF8) {
|
|
/*UTF8 check*/
|
|
if (utf8_isvalid(char_string->value, char_string->length)) {
|
|
valid = true;
|
|
}
|
|
} else {
|
|
/*non UTF8*/
|
|
valid = true;
|
|
}
|
|
}
|
|
}
|
|
return valid;
|
|
}
|
|
|
|
#if BACNET_USE_OCTETSTRING
|
|
/**
|
|
* @brief Initialize an octet string with the given bytes or
|
|
* zeros, if NULL for the value is provided.
|
|
*
|
|
* @param octet_string Pointer to the octet string.
|
|
* @param value Pointer to the bytes to be copied to the octet
|
|
* string or NULL to initialize the octet string.
|
|
* @param length Count of bytes used to fill the octet string.
|
|
*
|
|
* @return true on success, false if the string exceeds capacity.
|
|
*/
|
|
bool octetstring_init(
|
|
BACNET_OCTET_STRING *octet_string, uint8_t *value, size_t length)
|
|
{
|
|
bool status = false; /* return value */
|
|
size_t i; /* counter */
|
|
uint8_t *pb = NULL;
|
|
|
|
if (octet_string && (length <= MAX_OCTET_STRING_BYTES)) {
|
|
octet_string->length = 0;
|
|
if (value) {
|
|
pb = octet_string->value;
|
|
for (i = 0; i < MAX_OCTET_STRING_BYTES; i++) {
|
|
if (i < length) {
|
|
*pb = value[i];
|
|
} else {
|
|
*pb = 0;
|
|
}
|
|
pb++;
|
|
}
|
|
octet_string->length = length;
|
|
} else {
|
|
memset(octet_string->value, 0, MAX_OCTET_STRING_BYTES);
|
|
}
|
|
status = true;
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
/** @brief Converts an null terminated ASCII Hex string to an octet string.
|
|
*
|
|
* @param octet_string Pointer to the octet string.
|
|
* @param ascii_hex Pointer to the HEX-ASCII string.
|
|
*
|
|
* @return true if successfully converted and fits; false if too long */
|
|
bool octetstring_init_ascii_hex(
|
|
BACNET_OCTET_STRING *octet_string, const char *ascii_hex)
|
|
{
|
|
bool status = false; /* return value */
|
|
unsigned index = 0; /* offset into buffer */
|
|
uint8_t value = 0;
|
|
char hex_pair_string[3] = "";
|
|
|
|
if (octet_string && ascii_hex) {
|
|
octet_string->length = 0;
|
|
if (ascii_hex[0] == 0) {
|
|
/* nothing to decode, so success! */
|
|
status = true;
|
|
} else {
|
|
while (ascii_hex[index] != 0) {
|
|
if (!isalnum((int)ascii_hex[index])) {
|
|
/* skip non-numeric or alpha */
|
|
index++;
|
|
continue;
|
|
}
|
|
if (ascii_hex[index + 1] == 0) {
|
|
/* not a hex pair */
|
|
status = false;
|
|
break;
|
|
}
|
|
hex_pair_string[0] = ascii_hex[index];
|
|
hex_pair_string[1] = ascii_hex[index + 1];
|
|
value = (uint8_t)strtol(hex_pair_string, NULL, 16);
|
|
if (octet_string->length <= MAX_OCTET_STRING_BYTES) {
|
|
octet_string->value[octet_string->length] = value;
|
|
octet_string->length++;
|
|
/* at least one pair was decoded */
|
|
status = true;
|
|
} else {
|
|
/* too long */
|
|
status = false;
|
|
break;
|
|
}
|
|
/* set up for next pair */
|
|
index += 2;
|
|
}
|
|
}
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* Copy an octet string from source to destination.
|
|
*
|
|
* @param dest Pointer to the destination octet string.
|
|
* @param src Pointer to the source octet string.
|
|
*
|
|
* @return true on success, false otherwise.
|
|
*/
|
|
bool octetstring_copy(BACNET_OCTET_STRING *dest, BACNET_OCTET_STRING *src)
|
|
{
|
|
return octetstring_init(
|
|
dest, octetstring_value(src), octetstring_length(src));
|
|
}
|
|
|
|
/**
|
|
* @brief Copy bytes from the octet string to a byte buffer.
|
|
*
|
|
* @param dest Pointer to the byte buffer.
|
|
* @param length Bytes to be copied from the
|
|
* octet string to the buffer.
|
|
* @param src Pointer to the octet string.
|
|
*
|
|
* @return Returns the number of bytes copied, or 0 if
|
|
* the dest cannot hold entire octetstring value.
|
|
*/
|
|
size_t octetstring_copy_value(
|
|
uint8_t *dest, size_t length, BACNET_OCTET_STRING *src)
|
|
{
|
|
size_t bytes_copied = 0;
|
|
size_t i; /* counter */
|
|
|
|
if (src && dest) {
|
|
if (length <= src->length) {
|
|
for (i = 0; i < src->length; i++) {
|
|
dest[i] = src->value[i];
|
|
}
|
|
bytes_copied = src->length;
|
|
}
|
|
}
|
|
|
|
return bytes_copied;
|
|
}
|
|
|
|
/**
|
|
* @brief Append bytes to the end of the octet string.
|
|
*
|
|
* @param octet_string Pointer to the octet string.
|
|
* @param value Pointer to the byte buffer to be appended.
|
|
* @param length Bytes to be appended.
|
|
*
|
|
* @return false if the string exceeds capacity.
|
|
*/
|
|
bool octetstring_append(
|
|
BACNET_OCTET_STRING *octet_string, uint8_t *value, size_t length)
|
|
{
|
|
size_t i; /* counter */
|
|
bool status = false; /* return value */
|
|
|
|
if (octet_string) {
|
|
if ((length + octet_string->length) <= MAX_OCTET_STRING_BYTES) {
|
|
for (i = 0; i < length; i++) {
|
|
octet_string->value[octet_string->length] = value[i];
|
|
octet_string->length++;
|
|
}
|
|
status = true;
|
|
}
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* @brief This function sets a new length without changing the value.
|
|
* If length exceeds capacity, no modification happens and the
|
|
* function returns false.
|
|
*
|
|
* @param octet_string Pointer to the octet string.
|
|
* @param length New length the octet string is truncated to.
|
|
*
|
|
* @return tur on success, false otherwise.
|
|
*/
|
|
bool octetstring_truncate(BACNET_OCTET_STRING *octet_string, size_t length)
|
|
{
|
|
bool status = false; /* return value */
|
|
|
|
if (octet_string) {
|
|
if (length <= MAX_OCTET_STRING_BYTES) {
|
|
octet_string->length = length;
|
|
status = true;
|
|
}
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* @brief Returns a pointer to the value (data) of
|
|
* the given octet string.
|
|
*
|
|
* @param octet_string Pointer to the octet string.
|
|
*
|
|
* @return Value as a pointer to a byte array or NULL on error.
|
|
*/
|
|
uint8_t *octetstring_value(BACNET_OCTET_STRING *octet_string)
|
|
{
|
|
uint8_t *value = NULL;
|
|
|
|
if (octet_string) {
|
|
value = octet_string->value;
|
|
}
|
|
|
|
return value;
|
|
}
|
|
|
|
/**
|
|
* @brief Returns the length in bytes of
|
|
* the given octet string.
|
|
*
|
|
* @param octet_string Pointer to the octet string.
|
|
*
|
|
* @return Length in bytes. Returns always 0 on error.
|
|
*/
|
|
size_t octetstring_length(BACNET_OCTET_STRING *octet_string)
|
|
{
|
|
size_t length = 0;
|
|
|
|
if (octet_string) {
|
|
length = octet_string->length;
|
|
/* Force length to be within bounds. */
|
|
if (length > MAX_OCTET_STRING_BYTES) {
|
|
length = MAX_OCTET_STRING_BYTES;
|
|
}
|
|
}
|
|
|
|
return length;
|
|
}
|
|
|
|
/**
|
|
* @brief Returns the maximum capacity of an octet string.
|
|
*
|
|
* @param octet_string Pointer to the octet string.
|
|
*
|
|
* @return Capacity in bytes. Returns always 0 on error.
|
|
*/
|
|
size_t octetstring_capacity(BACNET_OCTET_STRING *octet_string)
|
|
{
|
|
size_t length = 0;
|
|
|
|
if (octet_string) {
|
|
length = MAX_OCTET_STRING_BYTES;
|
|
}
|
|
|
|
return length;
|
|
}
|
|
|
|
/**
|
|
* @brief Returns true if the same length and contents.
|
|
*
|
|
* @param octet_string1 Pointer to the first octet string.
|
|
* @param octet_string2 Pointer to the second octet string.
|
|
*
|
|
* @return true if the octet strings are the same, false otherwise.
|
|
*/
|
|
bool octetstring_value_same(
|
|
BACNET_OCTET_STRING *octet_string1, BACNET_OCTET_STRING *octet_string2)
|
|
{
|
|
size_t i = 0; /* loop counter */
|
|
|
|
if (octet_string1 && octet_string2) {
|
|
if ((octet_string1->length == octet_string2->length) &&
|
|
(octet_string1->length <= MAX_OCTET_STRING_BYTES)) {
|
|
for (i = 0; i < octet_string1->length; i++) {
|
|
if (octet_string1->value[i] != octet_string2->value[i]) {
|
|
return false;
|
|
}
|
|
}
|
|
return true;
|
|
}
|
|
}
|
|
|
|
return false;
|
|
}
|
|
#endif
|
|
|
|
/**
|
|
* @brief Compare two strings ignoring case
|
|
* @param s1 - first string
|
|
* @param s2 - second string
|
|
* @return 0 if the strings are equal, otherwise non-zero
|
|
*/
|
|
int bacnet_stricmp(const char *s1, const char *s2)
|
|
{
|
|
unsigned char c1, c2;
|
|
|
|
do {
|
|
c1 = (unsigned char)*s1;
|
|
c2 = (unsigned char)*s2;
|
|
c1 = (unsigned char)tolower(c1);
|
|
c2 = (unsigned char)tolower(c2);
|
|
s1++;
|
|
s2++;
|
|
} while ((c1 == c2) && (c1 != '\0'));
|
|
|
|
return (int)c1 - c2;
|
|
}
|
|
|
|
/**
|
|
* @brief non-standard strnlen function
|
|
* @param s - string to check
|
|
* @param maxlen - maximum length to check
|
|
* @return length of string, up to maxlen
|
|
*/
|
|
size_t bacnet_strnlen(const char *s, size_t maxlen)
|
|
{
|
|
size_t len;
|
|
|
|
for (len = 0; len < maxlen; len++, s++) {
|
|
if (!*s) {
|
|
break;
|
|
}
|
|
}
|
|
|
|
return len;
|
|
}
|