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mocchiut |
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/************************************************************ |
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* 13/9/2005 modified by david fedele to read buffer-data |
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* instead raw-data-file |
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* 29/11/2005 modified by david fedele to include crc control |
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************************************************************** |
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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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/* 13/9/2005 modified by david fedele */ |
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/* 29/11/2005 modified by david fedele */ |
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/*void readtrailer_(unsigned short *trailer, int *error, int *fd)*/ |
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void getbytes_(int *nbytes, char *buffer, int *p, unsigned int *value); |
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unsigned char crc8_8(unsigned char old, unsigned char data); |
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void readtrailer_(unsigned short *trailer, int *error,char *buffer, int *len,int *curpos,int *startcrc,int *stopcrc,unsigned int *crctemp) |
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/**************************************************************/ |
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{ |
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int i; |
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*error=0; |
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/************************************************************ |
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* 13/9/2005 modified by david fedele */ |
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/* int nread; */ |
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/* unsigned short word; */ |
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/* /\*** read the buffer ***\/ */ |
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/* nread=read(*fd, trailer, 2*3);//il trailer e' lungo 6 parole da 8 bits */ |
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/* if( nread==0 ) { */ |
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/* printf("readtrailer: 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 != 6) { */ |
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/* printf("readtrailer: 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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/* /\*** correct byte ***\/ //endianess... */ |
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/* for(i=0; i<3; i++) { */ |
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/* word = trailer[i]; */ |
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/* trailer[i] = ( (word&0x00ff) << 8 ) | ( (word&0xff00) >> 8 ); */ |
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/* } */ |
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unsigned int word[3]; |
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int nbytes2=2; |
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char *buff=buffer; |
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if( *curpos+(2*3)-1>*len ) { |
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// printf("readtrailer: Unexpected end of file \n"); |
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*error=1; |
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return ; |
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} |
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for (i=0;i<3;i++) |
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getbytes_(&nbytes2,buff,curpos,&word[i]); |
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for( i=0; i<3; i++) trailer[i]=word[i]; |
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/****************************************************************/ |
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// for( i=0; i<3; i++) printf("%x \n",trailer[i]);//??? |
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/************************************************************ |
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* 29/11/2005 modified by david fedele */ |
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stopcrc=curpos; |
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*crctemp=0; |
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for(i=*startcrc-1;i<*stopcrc-2;i++) |
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*crctemp=crc8_8(*crctemp,buffer[i]); |
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/****************************************************************/ |
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return; |
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} |
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