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POCSAG: Allow all 128 ASCII characters to be transmitted using pointed brackets

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This commit is contained in:
Andreas Eversberg
2024-04-28 17:47:55 +02:00
parent a6bf66ee83
commit 1f55ad659b
6 changed files with 69 additions and 10 deletions
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51
src/pocsag/frame.c
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@@ -38,7 +38,7 @@
static const char numeric[16] = "0123456789RU -][";
static const char hex[16] = "0123456789abcdef";
static const char *ctrl_char[33] = {
static const char *ctrl_char[32] = {
"<NUL>",
"<SOH>",
"<STX>",
@@ -71,9 +71,10 @@ static const char *ctrl_char[33] = {
"<GS>",
"<RS>",
"<US>",
"<DEL>",
};
static const char *del_char = "<DEL>";
const char *print_message(const char *message, int message_length)
{
static char message_print[1024];
@@ -85,7 +86,7 @@ const char *print_message(const char *message, int message_length)
if (message[i] >= 0 && message[i] <= 31)
c = ctrl_char[(int)message[i]];
else if (message[i] == 127)
c = ctrl_char[(int)message[32]];
c = del_char;
else {
message_print[ii++] = message[i];
continue;
@@ -101,6 +102,50 @@ const char *print_message(const char *message, int message_length)
return message_print;
}
int scan_message(const char *message_input, int message_input_length, char *message_output, int message_output_length)
{
int i, ii, j, clen;
/* i is input counter, ii is output counter */
for (i = 0, ii = 0; i < message_input_length; ii++) {
if (ii == message_output_length)
break;
if (message_input[i] == '<') {
/* maybe a control character ? */
for (j = 0; j < 32; j++) {
clen = strlen(ctrl_char[j]);
/* skip, if control sequence would not fit into the input buffer */
if (clen <= message_input_length - i && !memcmp(message_input + i, ctrl_char[j], clen)) {
/* found control sequence, so break the loop */
break;
}
}
if (j < 32) {
/* if loop was not completed, use the found character */
message_output[ii] = j;
i += clen;
} else {
clen = strlen(del_char);
/* skip, if control sequence would not fit into the input buffer */
if (clen <= i - message_input_length && !memcmp(message_input + i, del_char, clen)) {
/* found control sequence, copy DEL character */
message_output[ii] = 127;
i += clen;
} else {
/* found no control sequence, copy '<' character */
message_output[ii] = '<';
i++;
}
}
} else {
/* no control character */
message_output[ii] = message_input[i];
i++;
}
}
return ii;
}
static uint32_t pocsag_crc(uint32_t word)
{