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Diffstat (limited to 'checkfs/makefiles.c')
| -rw-r--r-- | checkfs/makefiles.c | 264 |
1 files changed, 264 insertions, 0 deletions
diff --git a/checkfs/makefiles.c b/checkfs/makefiles.c new file mode 100644 index 0000000..662fe86 --- /dev/null +++ b/checkfs/makefiles.c @@ -0,0 +1,264 @@ +/* + + * Copyright Daniel Industries. + + * Created by: Vipin Malik (vipin.malik@daniel.com) + * + * This is GPL code. See the file COPYING for more details + * + * Software distributed under the Licence is distributed on an "AS IS" + * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. + * See the Licence for the specific language governing rights and + * limitations under the Licence. + + * $Id: makefiles.c,v 1.2 2005/11/07 11:15:17 gleixner Exp $ + +This program creates MAX_NUM_FILES files (file00001, file00002 etc) and +fills them with random numbers till they are a random length. Then it checksums +the files (with the checksum as the last two bytes) and closes the file. + +The fist int is the size of the file in bytes. + +It then opens another file and the process continues. + +The files are opened in the current dir. + +*/ +#include <sys/types.h> +#include <sys/stat.h> +#include <fcntl.h> +#include <stdio.h> +#include <stdlib.h> +#include "common.h" + +#define FILESIZE_MAX 20000.0 /* for each file in sizeof(int). Must be a float # + Hence, 20000.0 = 20000*4 = 80KB max file size + */ + +static const unsigned short crc_ccitt_table[] = { + 0x0000, 0x1189, 0x2312, 0x329b, 0x4624, 0x57ad, 0x6536, 0x74bf, + 0x8c48, 0x9dc1, 0xaf5a, 0xbed3, 0xca6c, 0xdbe5, 0xe97e, 0xf8f7, + 0x1081, 0x0108, 0x3393, 0x221a, 0x56a5, 0x472c, 0x75b7, 0x643e, + 0x9cc9, 0x8d40, 0xbfdb, 0xae52, 0xdaed, 0xcb64, 0xf9ff, 0xe876, + 0x2102, 0x308b, 0x0210, 0x1399, 0x6726, 0x76af, 0x4434, 0x55bd, + 0xad4a, 0xbcc3, 0x8e58, 0x9fd1, 0xeb6e, 0xfae7, 0xc87c, 0xd9f5, + 0x3183, 0x200a, 0x1291, 0x0318, 0x77a7, 0x662e, 0x54b5, 0x453c, + 0xbdcb, 0xac42, 0x9ed9, 0x8f50, 0xfbef, 0xea66, 0xd8fd, 0xc974, + 0x4204, 0x538d, 0x6116, 0x709f, 0x0420, 0x15a9, 0x2732, 0x36bb, + 0xce4c, 0xdfc5, 0xed5e, 0xfcd7, 0x8868, 0x99e1, 0xab7a, 0xbaf3, + 0x5285, 0x430c, 0x7197, 0x601e, 0x14a1, 0x0528, 0x37b3, 0x263a, + 0xdecd, 0xcf44, 0xfddf, 0xec56, 0x98e9, 0x8960, 0xbbfb, 0xaa72, + 0x6306, 0x728f, 0x4014, 0x519d, 0x2522, 0x34ab, 0x0630, 0x17b9, + 0xef4e, 0xfec7, 0xcc5c, 0xddd5, 0xa96a, 0xb8e3, 0x8a78, 0x9bf1, + 0x7387, 0x620e, 0x5095, 0x411c, 0x35a3, 0x242a, 0x16b1, 0x0738, + 0xffcf, 0xee46, 0xdcdd, 0xcd54, 0xb9eb, 0xa862, 0x9af9, 0x8b70, + 0x8408, 0x9581, 0xa71a, 0xb693, 0xc22c, 0xd3a5, 0xe13e, 0xf0b7, + 0x0840, 0x19c9, 0x2b52, 0x3adb, 0x4e64, 0x5fed, 0x6d76, 0x7cff, + 0x9489, 0x8500, 0xb79b, 0xa612, 0xd2ad, 0xc324, 0xf1bf, 0xe036, + 0x18c1, 0x0948, 0x3bd3, 0x2a5a, 0x5ee5, 0x4f6c, 0x7df7, 0x6c7e, + 0xa50a, 0xb483, 0x8618, 0x9791, 0xe32e, 0xf2a7, 0xc03c, 0xd1b5, + 0x2942, 0x38cb, 0x0a50, 0x1bd9, 0x6f66, 0x7eef, 0x4c74, 0x5dfd, + 0xb58b, 0xa402, 0x9699, 0x8710, 0xf3af, 0xe226, 0xd0bd, 0xc134, + 0x39c3, 0x284a, 0x1ad1, 0x0b58, 0x7fe7, 0x6e6e, 0x5cf5, 0x4d7c, + 0xc60c, 0xd785, 0xe51e, 0xf497, 0x8028, 0x91a1, 0xa33a, 0xb2b3, + 0x4a44, 0x5bcd, 0x6956, 0x78df, 0x0c60, 0x1de9, 0x2f72, 0x3efb, + 0xd68d, 0xc704, 0xf59f, 0xe416, 0x90a9, 0x8120, 0xb3bb, 0xa232, + 0x5ac5, 0x4b4c, 0x79d7, 0x685e, 0x1ce1, 0x0d68, 0x3ff3, 0x2e7a, + 0xe70e, 0xf687, 0xc41c, 0xd595, 0xa12a, 0xb0a3, 0x8238, 0x93b1, + 0x6b46, 0x7acf, 0x4854, 0x59dd, 0x2d62, 0x3ceb, 0x0e70, 0x1ff9, + 0xf78f, 0xe606, 0xd49d, 0xc514, 0xb1ab, 0xa022, 0x92b9, 0x8330, + 0x7bc7, 0x6a4e, 0x58d5, 0x495c, 0x3de3, 0x2c6a, 0x1ef1, 0x0f78 +}; + +//This code was taken from the AX.25 HDLC packet driver +//in LINUX. Once I test and have a better understanding of what +//it is doing, it will be better commented. + +//For now one can speculate that the CRC routine always expects the +//CRC to calculate out to 0xf0b8 (the hardcoded value at the end) +//and returns TRUE if it is and FALSE if it doesn't. +//Why don't people document better!!!! +void check_crc_ccitt(char *filename) +{ + FILE *fp; + unsigned short crc = 0xffff; + int len; + char dataByte; + int retry; + + fp = fopen(filename,"rb"); + if(!fp){ + printf("Verify checksum:Error! Cannot open filename passed for verify checksum: %s\n",filename); + exit(1); + } + /*the first int contains an int that is the length of the file in long.*/ + if(fread(&len, sizeof(int), 1, fp) != 1){ + printf("verify checksum:Error reading from file: %s", filename); + fclose(fp); + exit(1); + } + rewind(fp); + len+=2; /*the file has two extra bytes at the end, it's checksum. Those + two MUST also be included in the checksum calculation. + */ + + for (;len>0;len--){ + retry=5; /*retry 5 times*/ + while(!fread(&dataByte, sizeof(char), 1, fp) && retry--); + if(!retry){ + printf("Unexpected error reading from file: %s\n", filename); + printf("...bytes left to be read %i.\n\n",len); + fclose(fp); + exit(1); + } + crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ dataByte) & 0xff]; + } + fclose(fp); + if( (crc & 0xffff) != 0xf0b8){ + printf("Verify checksum: Error in file %s.\n\n",filename); + exit(1); + } +}//end check_crc_ccitt() + + + +/*this routine opens a file 'filename' and checksumn's the entire + contents, and then appends the checksum at the end of the file, + closes the file and returns. +*/ +void checksum(char *filename){ + + FILE *fp; + unsigned short crc = 0xffff; + int len; + char dataByte; + int retry; + + fp = fopen(filename,"rb"); + if(!fp){ + printf("Error! Cannot open filename passed for checksum: %s\n",filename); + exit(1); + } + /*the first int contains an int that is the length of the file in longs.*/ + if(fread(&len, sizeof(int), 1, fp) != 1){ + printf("Error reading from file: %s", filename); + fclose(fp); + exit(1); + } + printf("Calculating checksum on %i bytes.\n",len); + rewind(fp); /*the # of bytes int is also included in the checksum.*/ + + for (;len>0;len--){ + retry=5; /*retry 5 times*/ + while(!fread(&dataByte, sizeof(char), 1, fp) && retry--); + if(!retry){ + printf("Unexpected error reading from file: %s\n", filename); + printf("...bytes left to be read %i.\n\n",len); + fclose(fp); + exit(1); + } + crc = (crc >> 8) ^ crc_ccitt_table[(crc ^ dataByte) & 0xff]; + } + crc ^= 0xffff; + printf("The CRC: %x\n\n", crc); + + /*the CRC has been calculated. now close the file and open it in append mode*/ + fclose(fp); + + fp = fopen(filename,"ab"); /*open in append mode. CRC goes at the end.*/ + if(!fp){ + printf("Error! Cannot open filename to update checksum: %s\n",filename); + exit(1); + } + if(fwrite(&crc, sizeof(crc), 1, fp) != 1){ + printf("error! unable to update the file for checksum.\n"); + fclose(fp); + exit(1); + } + fflush(fp); + fclose(fp); + + +}/*end checksum()*/ + + + +int main(void){ + + FILE *fp, *cyclefp; + int cycleCount; + int rand_data; + int data_size; + int temp_size; + char filename[30]; + short filenameCounter = 0; + unsigned short counter; + unsigned short numberFiles; + + numberFiles = MAX_NUM_FILES; + + for(counter=0;counter<numberFiles;counter++){ + /*create the filename in sequence*/ + sprintf(filename,"file%i",filenameCounter++); + fp = fopen(filename,"wb"); + if(!fp){ + printf("Error! Cannot open file: %s\n",filename); + exit(1); + } + /*now write a bunch of random binary data to the file*/ + /*first figure out how much data to write. That is random also.*/ + + while( + ((data_size = (int)(1 + (int)(FILESIZE_MAX*rand()/(RAND_MAX+1.0)))) < 100) + )/*file should not be less than 100 ints long. (so that we have decent length files, that's all)*/ + + printf("Writing %i ints to the file.\n", data_size); + + temp_size = data_size * sizeof(int); + + if(!fwrite(&temp_size, sizeof(int), 1, fp)){ + printf("File write error!!.\n"); + fclose(fp); + exit(1); + } + data_size--; /*one alrady written*/ + + while(data_size--){ + rand_data = (int)(1 + (int)(10000.0*rand()/(RAND_MAX+1.0))); + if(!fwrite(&rand_data, sizeof(int), 1, fp)){ + printf("File write error!!.\n"); + fclose(fp); + exit(1); + } + } + fflush(fp); + fclose(fp); + /*now calculate the file checksum and append it to the end*/ + checksum(filename); + /*this is just a test. Check the CRC to amek sure that it is OK.*/ + check_crc_ccitt(filename); + } + + /*now make a file called "cycleCnt" and put a binary (int)0 in it. + This file keeps count as to how many cycles have taken place!*/ + cyclefp = fopen("cycleCnt","wb"); + if(!cyclefp){ + printf("cannot open file \"cycleCnt\". Cannot continue.\n"); + exit(1); + } + cycleCount = 0; + if(fwrite(&cycleCount, sizeof(cycleCount), 1,cyclefp) !=1){ + printf("Error writing to file cycleCnt. Cannot continue.\n"); + exit(1); + } + fclose(cyclefp); + exit(0); + +}/*end main()*/ + + + + + + + |