Maintenance script: Repair batch-0008 pages from live compare

2026-03-27T01:40:38Z

Repair batch-0008 pages from live compare

← Older revision		Revision as of 01:40, 27 March 2026
Line 7:		Line 7:
	#include <time.h>		#include <time.h>

	int main(int argc, char * argv[]) {		int main(int argc, char * argv[]) {
	FILE * fileHandle;		FILE * fileHandle;
	int i, request;		int i, request;
Line 13:		Line 13:

	if (argc != 3) {		if (argc != 3) {
	fprintf(stderr, "Usage : %s [length of dummy file~~] [~~dummy file name]", argv[0]);		fprintf(stderr, "Usage : %s [length of dummy file] [dummy file name]", argv[0]);
	exit(1);		exit(1);
	}		}

	request = atoi(argv[1]);		request = atoi(argv[1]);

	fileHandle = fopen(argv[2], "wb");		fileHandle = fopen(argv[2], "wb");

	if (!fileHandle) {		if (!fileHandle) {
Line 45:		Line 45:
	#include <time.h>		#include <time.h>

	int main(int argc, char * argv[]) {		int main(int argc, char * argv[]) {
	int divTable[6];		int divTable[6];
	FILE * fileHandle;		FILE * fileHandle;
	unsigned long request, extractMask;		unsigned long request, extractMask;
Line 54:		Line 54:

	if (argc != 3) {		if (argc != 3) {
	fprintf(stderr, "Usage : %s [length of dummy file~~] [~~dummy file name]", argv[0]);		fprintf(stderr, "Usage : %s [length of dummy file] [dummy file name]", argv[0]);
	exit(1);		exit(1);
	}		}

	request = atoi(argv[1]);		request = atoi(argv[1]);

	fileHandle = fopen(argv[2], "wb");		fileHandle = fopen(argv[2], "wb");

	if (!fileHandle) {		if (!fileHandle) {
Line 70:		Line 70:

	for (i = 0, extractMask = 0x0000000F; i < 6; i++, extractMask <<= 4)		for (i = 0, extractMask = 0x0000000F; i < 6; i++, extractMask <<= 4)
	divTable[i] = (request & extractMask) >> (i * 4);		divTable[i] = (request & extractMask) >> (i * 4);

	for (i = 0; i < 6; i++)		for (i = 0; i < 6; i++)
	if (divTable[i]) {		if (divTable[i]) {
	fragSize = 0x00000001 << (i * 4);		fragSize = 0x00000001 << (i * 4);

Line 86:		Line 86:
	memset(frag, 0, fragSize);		memset(frag, 0, fragSize);

	for (j = 0; j < divTable[i]; j++)		for (j = 0; j < divTable[i]; j++)
	fwrite(frag, sizeof(char), fragSize, fileHandle);		fwrite(frag, sizeof(char), fragSize, fileHandle);

Line 105:		Line 105:

	----		----
	[[zennith]]		zennith

imported>Unknown at 05:31, 7 February 2021

2021-02-07T05:31:47Z

New page

지정한 크기의 파일을 생성하는 프로그램
----
== source code ==
=== 처음의 착상 ===
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main(int argc, char * argv[]) {
FILE * fileHandle;
int i, request;
time_t start, end;

if (argc != 3) {
fprintf(stderr, "Usage : %s [length of dummy file] [dummy file name]", argv[0]);
exit(1);
}

request = atoi(argv[1]);

fileHandle = fopen(argv[2], "wb");

if (!fileHandle) {
fprintf(stderr, "File open error occured.");
exit(1);
}

start = clock();

for (i = 0; i < request; i++)
fputc('\0', fileHandle);

end = clock();

printf("\n%f\n", (double)(end - start) / CLK_TCK);

fclose(fileHandle);

return 0;
}

=== 신경쓴 버전. 1.1? ===
#include <stdio.h>
#include <stdlib.h>
#include <time.h>

int main(int argc, char * argv[]) {
int divTable[6];
FILE * fileHandle;
unsigned long request, extractMask;
int i, j, fragSize;
time_t start, end;
char * frag;

if (argc != 3) {
fprintf(stderr, "Usage : %s [length of dummy file] [dummy file name]", argv[0]);
exit(1);
}

request = atoi(argv[1]);

fileHandle = fopen(argv[2], "wb");

if (!fileHandle) {
fprintf(stderr, "File open error occured.");
exit(1);
}

start = clock();

for (i = 0, extractMask = 0x0000000F; i < 6; i++, extractMask <<= 4)
divTable[i] = (request & extractMask) >> (i * 4);

for (i = 0; i < 6; i++)
if (divTable[i]) {
fragSize = 0x00000001 << (i * 4);

frag = (char *)malloc(fragSize);

if (!frag) {
fprintf(stderr, "memory allocation error occured.");
fclose(fileHandle);
exit(1);
}

memset(frag, 0, fragSize);

for (j = 0; j < divTable[i]; j++)
fwrite(frag, sizeof(char), fragSize, fileHandle);

free(frag);
}

end = clock();

printf("\n%f\n", (double)(end - start) / CLK_TCK);

fclose(fileHandle);

return 0;
}

----
12389523 바이트의 쓰레기 파일을 각각 생성하는데 처음에 짠 허접 버전과 두번째의 약간 개선 버전이 각각 0.991초와 0.37초를 기록했다. 두번째 것을 만들면서.. 함수화 같은 거도 좀 했으면 좋겠다는 생각도 무럭무럭 무럭 들었으나.. 그놈의 귀찮음이 뭔지 ; 아무튼 발전이 없는 나로군.

----
[[zennith]]

Zennith/dummyfile - Revision history

Maintenance script: Repair batch-0008 pages from live compare

imported>Unknown at 05:31, 7 February 2021