Add some test and debug helpers

CMakeLists.txt

@@ -10,4 +10,6 @@ add_executable(mksparse src/mksparse.c)
 add_executable(hashtest src/hashtest.c src/hash.c)
 
 add_executable(test_merkle src/test_merkle.c src/merkle.c)
-add_executable(test_mmap src/test_mmap.c)
+add_executable(test_mmap src/test_mmap.c)
+add_executable(fillblocks src/fillblocks.c)
+add_executable(diffblocks src/diffblocks.c src/hash.c)

src/diffblocks.c

@@ -0,0 +1,72 @@
+//
+// Created by haraldwolff on 21.08.22.
+//
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <getopt.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+#include <hash.h>
+
+int main(int argc, char *argv[]){
+
+	int f1 = open(argv[1], O_RDWR);
+	if (f1 < 0)
+	{
+		printf("could not open %s (%s)\n", argv[1], strerror(errno));
+		exit(EXIT_FAILURE);
+	}
+	long size1 = lseek(f1, 0, SEEK_END);
+
+	void *mm1 = mmap(NULL, size1, PROT_READ | PROT_WRITE, MAP_SHARED, f1, 0);
+	if (mm1 == MAP_FAILED){
+		printf("could not mmap file.");
+		exit(EXIT_FAILURE);
+	}
+
+	int f2 = open(argv[2], O_RDWR);
+	if (f2 < 0)
+	{
+		printf("could not open %s (%s)\n", argv[2], strerror(errno));
+		exit(EXIT_FAILURE);
+	}
+	long size2 = lseek(f2, 0, SEEK_END);
+
+	void *mm2 = mmap(NULL, size2, PROT_READ | PROT_WRITE, MAP_SHARED, f2, 0);
+	if (mm2 == MAP_FAILED){
+		printf("could not mmap file.");
+		exit(EXIT_FAILURE);
+	}
+
+
+	long offset = 0;
+	u_int64_t *t1 = (u_int64_t *)mm1;
+	u_int64_t *t2 = (u_int64_t *)mm2;
+
+	while (offset < size1) {
+		uint64_t h1 = dhash( &t1[(offset >> 3)], 4096);
+		uint64_t h2 = dhash( &t2[(offset >> 3)], 4096);
+
+		if (h1 != h2) {
+			fprintf(stdout,"\r%0lx %0lx %0lx\n", offset, h1, h2);
+			fflush(stdout);
+		}
+
+		offset += 4096;
+
+		fprintf(stdout, "\roffset: 0x%llx  %d%%", offset, (100 * offset / size1));
+		fflush(stdout);
+	}
+
+	munmap(mm1, size1);
+	munmap(mm2, size2);
+
+	close(f1);
+	close(f2);
+
+}

src/fillblocks.c

@@ -0,0 +1,60 @@
+//
+// Created by haraldwolff on 21.08.22.
+//
+
+#include <stdlib.h>
+#include <stdio.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <sys/mman.h>
+#include <getopt.h>
+#include <string.h>
+#include <errno.h>
+#include <unistd.h>
+
+int main(int argc, char *argv[]){
+	int ch;
+	char filename[1024] = "";
+
+	while ((ch = getopt(argc, argv, "f:"))!=-1){
+		switch (ch){
+			case 'f':
+				strncpy(filename, optarg, 1024);
+				break;
+		}
+	}
+
+	if (!filename[0]){
+		printf("need filename:   blockfill -f <filename>\n");
+		exit(EXIT_FAILURE);
+	}
+
+	int f = open(filename, O_RDWR);
+	if (f < 0)
+	{
+		printf("could not open %s (%s)\n", filename, strerror(errno));
+		exit(EXIT_FAILURE);
+	}
+	long size = lseek(f, 0, SEEK_END);
+
+	void *mm = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, f, 0);
+	if (mm == MAP_FAILED){
+		printf("could not mmap file.");
+	} else {
+		long offset = 0;
+		u_int64_t *t = (u_int64_t *)mm;
+
+		while (offset < size) {
+			for (int n = 0; n < 512; n++) {
+				t[ (offset >> 3) + n ] = offset;
+			}
+			offset += 4096;
+			printf("\roffset: 0x%llx  %d%%", offset, (100 * offset / size));
+		}
+		printf("\n");
+
+		munmap(mm, size);
+	}
+	close(f);
+
+}