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Extract Packet Fields from Byte Stream

Code

#include <stdio.h>
#include <stdint.h>

typedef struct {
    uint8_t start;
    uint8_t command;
    uint16_t data;
    uint8_t crc;
    uint8_t end;
} Packet;

void print_packet_fields(uint8_t *buffer) {
    Packet packet = {
        .start = buffer[0],
        .command = buffer[1],
        .data = buffer[2] | (buffer[3] << 8),
        .crc = buffer[4],
        .end = buffer[5],
    };

    printf("Start: %d\n", packet.start);
    printf("Command: %d\n", packet.command);
    printf("Data: %d\n", packet.data);
    printf("CRC: %d\n", packet.crc);
    printf("End: %d\n", packet.end);
}

int main() {
    uint8_t buffer[6];
    for (int i = 0; i < 6; i++) {
        scanf("%hhu", &buffer[i]);
    }
    print_packet_fields(buffer);
    return 0;
}

Solving Approach

 

 

 

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Input

165 1 52 18 119 90

Expected Output

Start: 165 Command: 1 Data: 4660 CRC: 119 End: 90