From 6240b34ac784790e9171610603ee077d05fddc90 Mon Sep 17 00:00:00 2001
From: "sgunderson@bigfoot.com" <>
Date: Sat, 10 Feb 2007 13:11:04 +0100
Subject: [PATCH] Initial (probably final) checkin.

---
 dirsearch.c | 38 ++++++++++++++++++++++
 salvage.c   | 94 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 132 insertions(+)
 create mode 100644 dirsearch.c
 create mode 100644 salvage.c

diff --git a/dirsearch.c b/dirsearch.c
new file mode 100644
index 0000000..805b3c1
--- /dev/null
+++ b/dirsearch.c
@@ -0,0 +1,38 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define CLUSTER_SIZE 16384
+#define OFFSET 0x2800
+
+int main(int argc, char **argv)
+{
+	int fd = open("/home/sesse/minnekort.img", O_RDONLY);
+	int offset = OFFSET;
+	char rd[32];
+	
+	for ( ;; ) {
+		if (lseek(fd, offset, SEEK_SET) != offset) {
+			break;
+		}
+		read(fd, rd, 32);
+		if (memcmp(rd, ".          ", 11) == 0) {
+			int i;
+			
+			printf("Possible directory found at 0x%x\n", offset);
+			for (i = 0; i < 128; ++i) {
+				read(fd, rd, 32);
+				printf("%c%c%c%c%c%c%c%c.%c%c%c\n",
+					rd[0], rd[1], rd[2], rd[3],
+					rd[4], rd[5], rd[6], rd[7],
+					rd[8], rd[9], rd[10]);
+			}
+		}
+		offset += CLUSTER_SIZE;
+		printf("0x%x\r", offset);
+		fflush(stdout);
+	}
+	return 0;
+}
diff --git a/salvage.c b/salvage.c
new file mode 100644
index 0000000..413a15c
--- /dev/null
+++ b/salvage.c
@@ -0,0 +1,94 @@
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define FAT_SIZE 65536
+#define FAT_START 0x27400
+#define DATA_START 0x42800
+#define CLUSTER_SIZE 16384
+unsigned short fat[FAT_SIZE];
+
+int main(int argc, char **argv)
+{
+	int fd = open("/home/sesse/minnekort.img", O_RDONLY);
+	int ofd;
+	int offset;
+	int cluster;
+	int left;
+	unsigned char de[32];
+	char filename[8 + 1 + 3 + 1];
+	char data[CLUSTER_SIZE];
+	
+	if (fd == -1) {
+		perror("/home/sesse/minnekort.img");
+		exit(1);
+	}
+
+	// read the FAT
+	lseek(fd, FAT_START, SEEK_SET);
+	read(fd, fat, FAT_SIZE * sizeof(unsigned short));
+
+	// read the directory structure in question
+	sscanf(argv[1], "%i", &offset);
+	lseek(fd, offset, SEEK_SET);
+	read(fd, de, 32);
+
+	memcpy(filename, de, 8);
+	filename[8] = '.';
+	memcpy(filename + 9, de + 8, 3);
+	filename[12] = '\0';
+	
+	printf("Filename = %s\n", filename);
+	ofd = open(filename, O_WRONLY | O_CREAT, 0644);
+
+	left = *((unsigned int *)(de + 0x1c));
+	printf("Size = %u\n", left);
+	
+	printf("Recovering:");
+	cluster = *((unsigned short *)(de + 0x1a));
+//	printf(" %u(0x%x)", cluster, cluster * CLUSTER_SIZE + DATA_START);
+//	fflush(stdout);
+
+	for ( ;; ) {
+		int towrite = (CLUSTER_SIZE < left) ? CLUSTER_SIZE : left;
+
+		lseek(fd, cluster * CLUSTER_SIZE + DATA_START, SEEK_SET);
+		read(fd, data, CLUSTER_SIZE);	
+		write(ofd, data, towrite);
+
+		// read the next entry in the FAT
+		cluster = fat[cluster];
+		
+	/*	if (towrite < CLUSTER_SIZE)
+			printf("(trunc)");
+		printf(" %u", cluster);
+		fflush(stdout);*/
+
+		if (cluster < 0x0002) {
+			printf(" (ERROR)");
+			break;
+		}
+		if (cluster >= 0xfff0 && cluster < 0xfff8) {
+			printf(" (ERROR)");
+			break;
+		}
+		if (cluster >= 0xfff8) {
+			printf(" (EOF)");
+			break;
+		}
+		if (towrite < CLUSTER_SIZE) {
+			printf(" (EXPECTED EOF)\n");
+		}
+		
+	//	printf("(0x%x)", cluster * CLUSTER_SIZE + DATA_START);
+
+		left -= towrite;
+	}
+	printf("\n");
+	close(fd);
+	close(ofd);
+
+	return 0;
+}
-- 
2.39.2