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[/] [eco32/] [trunk/] [stdalone/] [dskchk2/] [genimg.c] - Rev 258
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/* * genimg.c -- generate test image */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <stdarg.h> #define NUM_SECTORS 262144 /* sync with image checker */ #define SECTOR_SIZE 512 /**************************************************************/ void error(char *fmt, ...) { va_list ap; va_start(ap, fmt); printf("Error: "); vprintf(fmt, ap); printf("\n"); va_end(ap); exit(1); } /**************************************************************/ static unsigned int randomState = 0; void setRandomSeed(unsigned int seed) { randomState = seed; } unsigned int nextRandomNumber(void) { unsigned int retVal; retVal = randomState; randomState = randomState * 1103515245 + 12345; return retVal; } /**************************************************************/ static void usage(char *myself) { printf("Usage: %s <image file name>\n", myself); exit(1); } int main(int argc, char *argv[]) { char *imageFileName; FILE *imageFile; unsigned int sector; unsigned char buffer[SECTOR_SIZE]; int i; unsigned int number; if (argc != 2) { usage(argv[0]); } imageFileName = argv[1]; imageFile = fopen(imageFileName, "w"); if (imageFile == NULL) { error("cannot open image file '%s'", imageFileName); } for (sector = 0; sector < NUM_SECTORS; sector++) { setRandomSeed(sector); for (i = 0; i < SECTOR_SIZE / 4; i++) { number = nextRandomNumber(); buffer[4 * i + 0] = (number >> 24) & 0xFF; buffer[4 * i + 1] = (number >> 16) & 0xFF; buffer[4 * i + 2] = (number >> 8) & 0xFF; buffer[4 * i + 3] = (number >> 0) & 0xFF; } if (fwrite(buffer, 1, SECTOR_SIZE, imageFile) != SECTOR_SIZE) { error("cannot write image file '%s'", imageFileName); } } fclose(imageFile); return 0; }
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