openwrt/upstream - upstream openwrt

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Commits per author per week (path 'package/kernel/spi-ks8995/src')

Author	W36 2025	W37 2025	W38 2025	W39 2025	Total
Total	0	0	0	0	0

/* ************************************************************************** This program creates a CRC checksum and encodes the file that is named in the command line. Compile with: gcc encode_crc.c -Wall -o encode_crc Author: Michael Margraf (michael.margraf@freecom.com) Copyright: Freecom Technology GmbH, Berlin, 2004 www.freecom.com This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA ************************************************************************* */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/stat.h> // ******************************************************************* // CCITT polynom G(x)=x^16+x^12+x^5+1 #define POLYNOM 0x1021 // CRC algorithm with MSB first int make_crc16(int crc, char new) { int i; crc = crc ^ (((int)new) << 8); for(i=0; i<8; i++) { // work on 8 bits in "new" crc <<= 1; // MSBs first if(crc & 0x10000) crc ^= POLYNOM; } return crc & 0xFFFF; } // ******************************************************************* // Reads the file "filename" into memory and returns pointer to the buffer. static char *readfile(char *filename, int *size) { FILE *fp; char *buffer; struct stat info; if (stat(filename,&info)!=0) return NULL; if ((fp=fopen(filename,"r"))==NULL) return NULL; buffer=NULL; for (;;) { if ((buffer=(char *)malloc(info.st_size+1))==NULL) break; if (fread(buffer,1,info.st_size,fp)!=info.st_size) { free(buffer); buffer=NULL; break; } buffer[info.st_size]='\0'; if(size) *size = info.st_size; break; } (void)fclose(fp); return buffer; } // ******************************************************************* int main(int argc, char** argv) { if(argc < 3) { printf("ERROR: Argument missing!\n\n"); return 1; } int count; // size of file in bytes char *p, *master = readfile(argv[1], &count); if(!master) { printf("ERROR: File not found!\n"); return 1; } int crc = 0xFFFF, z; p = master; for(z=0; z<count; z++) crc = make_crc16(crc, *(p++)); // calculate CRC short crc16 = (short)crc; /* if(argc > 2) { // with flag for device recognition ? p = argv[2]; for(z=strlen(p); z>0; z--) { crc ^= (int)(*p); *(p++) = (char)crc; // encode device flag } } */ p = master; for(z=0; z<count; z++) { crc ^= (int)(*p); *(p++) = (char)crc; // encode file } // write encoded file... FILE *fp = fopen(argv[2], "w"); if(!fp) { printf("ERROR: File not writeable!\n"); return 1; } if(argc > 3) { // add flag for device recognition ? fwrite(argv[3], strlen(argv[3]), sizeof(char), fp); } else { // Device is an FSG, so byte swap (IXP4xx is big endian) crc16 = ((crc16 >> 8) & 0xFF) | ((crc16 << 8) & 0xFF00); } fwrite(&crc16, 1, sizeof(short), fp); // first write CRC fwrite(master, count, sizeof(char), fp); // write content fclose(fp); free(master); return 0; }


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