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/* |
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* include needed system headers |
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*/ |
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#include <stdio.h> /* include standard i/o library */ |
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#include <stdlib.h> /* include standard library */ |
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#include <string.h> /* include string library */ |
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#include <unistd.h> /* include unix standard library */ |
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#include <sys/types.h> /* */ |
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#include <sys/stat.h> /* */ |
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#include <fcntl.h> /* */ |
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#include <errno.h> /* error simbol definitions */ |
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#include <time.h> /* system time definitions */ |
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#include <math.h> /* math library */ |
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|
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void hunpacker_(unsigned short *buffer, int *error, int *fd) |
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|
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{ |
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int i; |
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int nread,nhead; |
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unsigned short word; |
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unsigned short buffer_temp[13], *oo, *oi, *o1; //packed mode |
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|
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///*** goes back a word***/ |
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// lseek(*fd, -2, SEEK_CUR); //SEEK_CUR ---> from current position |
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|
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*error=0; |
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|
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/*** read the buffer ***/ |
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nhead = 13; /* packed */ |
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nread=read(*fd, buffer_temp, 2*nhead); |
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if( nread==0 ) { |
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//printf("hunpacker: Unexpected end of file %d at %d \n",*fd,nread); |
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*error=1; |
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return ; |
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} |
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if ( nread != 2*nhead) { |
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//printf("hunpacker: Error on reading: nread = %d \n",nread); |
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*error=-1; |
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return ; |
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} |
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|
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/*** correct byte ***/ //endianess... |
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for(i=0; i<nhead; i++) { |
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word = buffer_temp[i]; |
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buffer_temp[i] = ( (word&0x00ff) << 8 ) | ( (word&0xff00) >> 8 ); |
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} |
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|
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|
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/*** buffer unpacking ***/ |
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if( nhead == 16 ) { // NO!??? |
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oo=buffer; /* nopacking buffer */ |
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oi=buffer_temp; |
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for( i=0; i<nhead; i++) *oo++ = *oi++; |
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} |
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if( nhead == 13 ) { |
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oo=buffer; /* unpacking buffer */ |
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oi=buffer_temp; |
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o1 = oi++; |
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*oo++ = (*o1 & 0xfff8) >> 3; |
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*oo++ = ( (*o1 & 0x0007) << 10 ) | ( (*oi & 0xffc0) >> 6); |
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o1 = oi++; |
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*oo++ = ( (*o1 & 0x003f) << 7 ) | ( (*oi & 0xfe00) >> 9); |
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o1 = oi++; |
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*oo++ = ( (*o1 & 0x01ff) << 4 ) | ( (*oi & 0xf000) >> 12); |
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o1 = oi++; |
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*oo++ = ( (*o1 & 0x0fff) << 1 ) | ( (*oi & 0x8000) >> 15); |
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*oo++ = (*oi & 0x7ffc) >> 2; |
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o1 = oi++; |
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*oo++ = ( (*o1 & 0x0003) << 11 ) | ( (*oi & 0xffe0) >> 5); |
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o1 = oi++; |
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*oo++ = ( (*o1 & 0x001f) << 8 ) | ( (*oi & 0xff00) >> 8); |
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o1 = oi++; |
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*oo++ = ( (*o1 & 0x00ff) << 5 ) | ( (*oi & 0xf800) >> 11); |
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o1 = oi++; |
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*oo++ = ( (*o1 & 0x07ff) << 2 ) | ( (*oi & 0xc000) >> 14); |
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*oo++ = (*oi & 0x3ffe) >> 1; |
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o1 = oi++; |
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*oo++ = ( (*o1 & 0x0001) << 12 ) | ( (*oi & 0xfff0) >> 4); |
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o1 = oi++; |
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*oo++ = ( (*o1 & 0x000f) << 9 ) | ( (*oi & 0xff80) >> 7); |
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o1 = oi++; |
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*oo++ = ( (*o1 & 0x007f) << 6 ) | ( (*oi & 0xfc00) >> 10); |
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o1 = oi++; |
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*oo++ = ( (*o1 & 0x03ff) << 3 ) | ( (*oi & 0xe000) >> 13); |
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*oo++ = *oi++ & 0x1fff; |
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} |
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|
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// for( i=0; i<16; i++) printf("%x \n",buffer[i]);//??? |
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|
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return; |
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} |
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