50 lines
1.1 KiB
C++
50 lines
1.1 KiB
C++
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#include "message77.h"
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#include "unpack.h"
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#include <string.h>
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namespace ft8 {
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Message77::Message77() {
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i3 = n3 = 0;
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field1[0] = field2[0] = field3[0] = '\0';
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}
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int Message77::str(char *buf, int buf_sz) const {
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// Calculate the available space sans the '\0' terminator
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int rem_sz = buf_sz - 1;
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int field1_sz = strlen(field1);
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int field2_sz = strlen(field2);
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int field3_sz = strlen(field3);
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int msg_sz = field1_sz + (field2_sz > 0 ? 1 : 0) +
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field2_sz + (field3_sz > 0 ? 1 : 0) +
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field3_sz;
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if (rem_sz < msg_sz) return -1;
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char *dst = buf;
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dst = stpcpy(dst, field1);
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*dst++ = ' ';
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dst = stpcpy(dst, field2);
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*dst++ = ' ';
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dst = stpcpy(dst, field3);
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*dst = '\0';
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return msg_sz;
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}
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int Message77::unpack(const uint8_t *a77) {
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// Extract n3 (bits 71..73) and i3 (bits 74..76)
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n3 = ((a77[8] << 2) & 0x04) | ((a77[9] >> 6) & 0x03);
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i3 = (a77[9] >> 3) & 0x07;
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int rc = unpack77_fields(a77, field1, field2, field3);
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if (rc < 0) {
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field1[0] = field2[0] = field3[0] = '\0';
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}
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return rc;
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}
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} // namespace ft8
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