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59 lines
1.4 KiB
C
59 lines
1.4 KiB
C
#include "serialnumber.h"
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int serial_add8(uint8_t s, uint8_t n) {
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if (n > 127)
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return -1;
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uint16_t sum = s+n;
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return (uint8_t)(sum%256);
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}
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int serial_add16(uint16_t s, uint16_t n) {
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if (n > 32767)
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return -1;
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uint32_t sum = s+n;
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return (uint16_t)(sum%65536);
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}
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int serial_add32(uint32_t s, uint32_t n) {
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if (n > 2147483647)
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return -1;
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uint64_t sum = s+n;
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return (uint32_t)(sum%4294967296);
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}
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serial_comp_res_t serial_comp8(uint8_t s1, uint8_t s2) {
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if (s1 == s2)
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return EQUAL;
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if ((s1 < s2 && s1 - s2 < 128) || (s1 > s2 && s1 - s2 > 128)) {
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return LESS;
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}
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if ((s1 < s2 && s1 - s2 > 128) || (s1 > s2 && s1 - s2 < 128)) {
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return GREATER;
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}
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return UNDEF;
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}
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serial_comp_res_t serial_comp16(uint16_t s1, uint16_t s2) {
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if (s1 == s2)
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return EQUAL;
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if ((s1 < s2 && s1 - s2 < 32768) || (s1 > s2 && s1 - s2 > 32768)) {
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return LESS;
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}
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if ((s1 < s2 && s1 - s2 > 32768) || (s1 > s2 && s1 - s2 < 32768)) {
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return GREATER;
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}
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return UNDEF;
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}
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serial_comp_res_t serial_comp32(uint32_t s1, uint32_t s2) {
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if (s1 == s2)
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return EQUAL;
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if ((s1 < s2 && s1 - s2 < 2147483648) || (s1 > s2 && s1 - s2 > 2147483648)) {
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return LESS;
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}
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if ((s1 < s2 && s1 - s2 > 2147483648) || (s1 > s2 && s1 - s2 < 2147483648)) {
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return GREATER;
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}
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return UNDEF;
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}
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