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added support for base37 encoded call sign

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This commit is contained in:
Ahmet Inan 2025-07-18 15:16:36 +02:00
commit 53acfab11c
3 changed files with 45 additions and 12 deletions
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17
decode.cc
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@ -80,6 +80,11 @@ struct Decoder : Common
}
return 0;
}
static void base37_decoder(char *str, int64_t val, int len)
{
for (int i = len-1; i >= 0; --i, val /= 37)
str[i] = " 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"[val%37];
}
const cmplx *mls0_seq()
{
CODE::MLS seq0(mls0_poly, mls0_seed);
@ -393,11 +398,17 @@ struct Decoder : Common
std::cerr << "preamble decoding error." << std::endl;
break;
}
if (meta_info > 255) {
std::cerr << "unsupported operation mode: " << meta_info << std::endl;
int64_t call = meta_info >> 8;
if (call == 0 || call >= 129961739795077L) {
std::cerr << "call sign unsupported." << std::endl;
break;
}
if (!setup(meta_info))
char call_sign[10];
base37_decoder(call_sign, call, 9);
call_sign[9] = 0;
std::cerr << "call sign: " << call_sign << std::endl;
int mode = meta_info & 255;
if (!setup(mode))
break;
k = 0;
for (int i = 0; i < symbol_pos+symbol_len+extended_len; ++i)