int main(void) {
int coded[MAX]; /* Кодирано съобщение */
char decoded[MAX]; /* Декодирано съобщение */
printf("Входно съобщение:\n%s\n", message);
LPCencode(coded, message);
printf("\nКодирано съобщение:\n");
print(coded, strlen(message));
LPCdecode(decoded, coded, strlen(message));
printf("\nДекодирано съобщение:\n%s", decoded);
return 0;
}
long UnLPC2(LPC_WORD *OutBuf, LPC_WORD *InBuf, short bufsize, short nc, ULONG *Flags)
{
static LPC_WORD HistBuf[PMAX*2];
static LPC_CORR AcHist[HISTSIZE][PMAX+1];
static int HistNum;
LPC_PRAM ref[PMAX];
LPC_CORR ac[PMAX+1];
int i, k;
ULONG FlagMask = 1;
int zwin = ZWINMIN;
if (nc > zwin) zwin = ZWINMAX;
if (InBuf == LAW_NULL) // Initialise?
{
HistNum = 0;
for (i = 0; i < nc; i++) ref[i] = 0;
for (i = 0; i < PMAX*2; i++) HistBuf[i] = 0;
for (i = 0; i < PMAX+1; i++)
for (int j = 0; j < HISTSIZE; j++)
AcHist[j][i] = 0;
// LPCdecode(LAW_NULL, nc, 0, LAW_NULL, LAW_NULL);
LPCdecode(NULL, nc, 0, NULL, NULL);
return 0;
}
//if ((bufsize % zwin) != 0) return -3;
for (i = 0; i < bufsize; i += zwin)
{
#if HISTSIZE == 4
for (k = 0; k < nc+1; k++)
ac[k] = (XPN)AcHist[0][k] + (XPN)AcHist[1][k] + (XPN)AcHist[2][k] + (XPN)AcHist[3][k];
#else
for (k = 0; k < nc+1; k++)
{
ac[k] = 0;
for (int h = 0; h < HISTSIZE; h++)
ac[k] = (XPN)ac[k] + (XPN)AcHist[h][k];
}
#endif
// Decode...
if ((*Flags & FlagMask) == 0)
{
schur(ac, nc, ref);
LPCdecode(ref, nc, zwin, InBuf+i, OutBuf+i);
}
else
{
LPCinit(); // Re-initialise
for (int j = 0; j < zwin; j++) OutBuf[i+j] = InBuf[i+j]; // Copy input to output
}
FlagMask <<= 1;
// Update the AutoCorrelation history data...
AddAC(HistBuf, OutBuf+i, nc+1, AcHist[HistNum]); // Process overlap of prev. & current buffer
if (++HistNum == HISTSIZE) HistNum = 0; // Increment History counter, wrap-around if needed
autocorrelation(zwin, OutBuf+i, nc+1, AcHist[HistNum]); // Update AcHist with current buffer
for (k = 0; k < nc; k++) HistBuf[k] = OutBuf[i+k]; // Store beginning of current buffer for next AddAC()
}
return 0;
}
