dali/bacnet_stack
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Moved bitstring handling to its own module - bacstr.c

Browse Source
This commit is contained in:
skarg
2005-12-17 21:45:34 +00:00
parent 950146b279
commit 4670b0c90c
4 changed files with 6 additions and 86 deletions
Download Patch File Download Diff File Expand all files Collapse all files
bacnet-stack/bacdcode.c
+1 -50
View File
@@ -39,6 +39,7 @@
#include "bacenum.h"
#include "bits.h"
#include "bigend.h"
#include "bacstr.h"
// NOTE: byte order plays a role in decoding multibyte values
// http://www.unixpapa.com/incnote/byteorder.html
@@ -273,56 +274,6 @@ int decode_unsigned32(uint8_t * apdu, uint32_t *value)
return 4;
}
void bitstring_init(BACNET_BIT_STRING *bit_string)
{
int i;
bit_string->bits_used = 0;
for (i = 0; i < MAX_BITSTRING_BYTES; i++)
{
bit_string->value[i] = 0;
}
}
void bitstring_set_bit(BACNET_BIT_STRING *bit_string, uint8_t bit, bool value)
{
uint8_t byte_number = bit/8;
uint8_t bit_mask = 1;
if (byte_number < MAX_BITSTRING_BYTES)
{
// set max bits used
if (bit_string->bits_used < (bit + 1))
bit_string->bits_used = bit + 1;
bit_mask = bit_mask << (bit - (byte_number * 8));
if (value)
bit_string->value[byte_number] |= bit_mask;
else
bit_string->value[byte_number] &= (~(bit_mask));
}
}
bool bitstring_bit(BACNET_BIT_STRING *bit_string, uint8_t bit)
{
bool value = false;
uint8_t byte_number = bit/8;
uint8_t bit_mask = 1;
if (bit < (MAX_BITSTRING_BYTES * 8))
{
bit_mask = bit_mask << (bit - (byte_number * 8));
if (bit_string->value[byte_number] & bit_mask)
value = true;
}
return value;
}
uint8_t bitstring_bits_used(BACNET_BIT_STRING *bit_string)
{
return bit_string->bits_used;
}
// from clause 20.2.1 General Rules for Encoding BACnet Tags
// returns the number of apdu bytes consumed
int encode_tag(uint8_t * apdu, uint8_t tag_number, bool context_specific,