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bird/lib/cbor_parse_tools.c
Katerina Kubecova 9f27bfc6fc Porting the CBOR encoder from the YANG branch
Minor cleanups by commiter.

(source commit 43ff10204b but expected
to be rebased later, don't worry if you fail to find it)
2024-10-01 14:26:00 +02:00

70 lines
1.6 KiB
C

#include <string.h>
#include "lib/cbor_parse_tools.h"
uint compare_buff_str(struct buff_reader *buf_read, uint length, char *string) {
if (length != strlen(string)) {
return 0;
}
for (size_t i = 0; i < strlen(string); i++) {
if (buf_read->buff[i+buf_read->pt]!=string[i]) {
return 0;
}
}
return 1;
};
struct value
get_value(struct buff_reader *reader)
{
struct value val;
byte *buff = reader->buff;
val.major = buff[reader->pt]>>5;
int first_byte_val = buff[reader->pt] - (val.major<<5);
if (first_byte_val <=23) {
val.val = first_byte_val;
reader->pt++;
} else if (first_byte_val == 0x18)
{
val.val = buff[reader->pt+1];
reader->pt+=2;
} else if (first_byte_val == 0x19)
{
val.val = buff[reader->pt+1];
val.val = val.val << 8;
val.val += buff[reader->pt+2];
reader->pt += 3;
} else if (first_byte_val == 0x1a)
{
val.val = 0;
for (int i = 1; i < 4; i++)
{
val.val += buff[reader->pt+i];
val.val = val.val << 8;
}
val.val += buff[reader->pt+4];
reader->pt+=5;
} else if (first_byte_val == 0x1b)
{
val.val = 0;
for (int i = 1; i < 8; i++) {
val.val += buff[reader->pt+i];
val.val = val.val << 8;
}
val.val += buff[reader->pt+8];
reader->pt += 9;
} else if (first_byte_val == 0x1f)
{
val.val = -1;
reader->pt++;
}
if (val.major == NEG_INT)
val.val = -1 - val.val;
return val;
}
int val_is_break(struct value val)
{
return val.major == FLOAT && val.val == -1; // break code is 0xff, so the major is same for float and break
}