osufs - project setup

osufs/.gitignore

+xcuserdata/

osufs/osufs.xcodeproj/project.pbxproj

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+			dependencies = (
+			);
+			name = osufs;
+			productName = osufs;
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+				ORGANIZATIONNAME = "Fang Lu";
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+					"$(inherited)",
+				);
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+				MACOSX_DEPLOYMENT_TARGET = 10.12;
+				MTL_ENABLE_DEBUG_INFO = YES;
+				ONLY_ACTIVE_ARCH = YES;
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+				CODE_SIGN_IDENTITY = "-";
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+				DEBUG_INFORMATION_FORMAT = "dwarf-with-dsym";
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+				GCC_C_LANGUAGE_STANDARD = gnu99;
+				GCC_NO_COMMON_BLOCKS = YES;
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+				MTL_ENABLE_DEBUG_INFO = NO;
+				SDKROOT = macosx;
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+	};
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+}

osufs/osufs.xcodeproj/project.xcworkspace/contents.xcworkspacedata

+<?xml version="1.0" encoding="UTF-8"?>
+<Workspace
+   version = "1.0">
+   <FileRef
+      location = "self:osufs.xcodeproj">
+   </FileRef>
+</Workspace>

osufs/osufs/blkio.c

+//
+//  blkio.c
+//  osufs
+//
+//  Created by Fang Lu on 11/28/17.
+//  Copyright © 2017 Fang Lu. All rights reserved.
+//
+
+#include "blkio.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+
+#ifdef _WIN32
+
+#error "Win32 NOT supported"
+
+#elif __APPLE__
+
+#include <sys/disk.h>
+
+uint64_t blkio_size(uint32_t dev) {
+	uint64_t sector_count = 0;
+	// Query the number of sectors on the disk
+	if (ioctl(dev, DKIOCGETBLOCKCOUNT, &sector_count) == -1) {
+		fprintf(stderr, "Failed to get block count\n");
+		return 0;
+	}
+	fprintf(stderr, "IOCTL: block count is %llu\n", sector_count);
+	
+	uint32_t sector_size = 0;
+	// Query the size of each sector
+	if (ioctl(dev, DKIOCGETBLOCKSIZE, &sector_size) == -1) {
+		fprintf(stderr, "Failed to get block size\n");
+		return 0;
+	}
+	fprintf(stderr, "IOCTL: block size is %u\n", sector_size);
+	
+	return sector_count * sector_size;
+}
+
+#elif __linux__
+
+#include <linux/fs.h>
+
+uint64_t blkio_size(uint32_t dev) {
+	uint64_t block_size = 0;
+	if (ioctl(dev, BLKGETSIZE, &block_size) == -1) {
+		fprintf(stderr, "Failed to get device size\n");
+		return 0; // Failed
+	}
+
+	return block_size;
+}
+
+#elif __unix__
+
+#error "Platform not supported"
+
+#elif defined(_POSIX_VERSION)
+
+#error "Platform not supported"
+
+#else
+
+#error "Unknown compiler"
+
+#endif
+
+
+mdev *blkio_open(const char *filename) {
+	uint32_t fd = open(filename, O_RDWR);
+	if (fd == -1) {
+		fprintf(stderr, "Failed to open file %s\n", filename);
+		fprintf(stderr, "%s (%d)\n", strerror(errno), errno);
+		return NULL;
+	}
+	uint64_t fsize = blkio_size(fd);
+	printf("File opened (fd=%u). Device size is: %llu\n", fd, fsize);
+	if (!fsize) {
+		return NULL;
+	}
+	void *base = mmap(NULL, fsize, PROT_READ,
+					  MAP_SHARED|MAP_FILE, fd, 0);
+	if (base == MAP_FAILED) {
+		fprintf(stderr, "MMap failed.\n");
+		fprintf(stderr, "%s (%d)\n", strerror(errno), errno);
+		return NULL;
+	}
+	if (close(fd) == -1) {
+		fprintf(stderr, "Failed to close file\n");
+	}
+	mdev *ret = malloc(sizeof(mdev));
+	ret->base = base;
+	ret->len = fsize;
+	ret->fd = fd;
+	return ret;
+}
+
+void blkio_close(mdev *dev) {
+	munmap(dev->base, dev->len);
+	close(dev->fd);
+	free(dev);
+}
+

osufs/osufs/blkio.h

+//
+//  blkio.h
+//  osufs
+//
+//  Created by Fang Lu on 11/28/17.
+//  Copyright © 2017 Fang Lu. All rights reserved.
+//
+
+#ifndef blkio_h
+#define blkio_h
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+	
+#include <inttypes.h>
+	
+typedef struct mdev_t {
+	void *base;
+	uint64_t len;
+	uint32_t fd;
+} mdev;
+
+mdev *blkio_open(const char *filename);
+void blkio_close(mdev *dev);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* blkio_h */

osufs/osufs/main.cpp

+//
+//  main
+//  osufs
+//
+//  Created by Fang Lu on 11/28/17.
+//  Copyright © 2017 Fang Lu. All rights reserved.
+//
+
+#include <stdio.h>
+
+#include "blkio.h"
+
+int main(int argc, char *argv[]) {
+	if (argc != 2) {
+		fprintf(stderr, "Usage: %s device file\n", argv[0]);
+		return 1;
+	}
+	
+	mdev *dev = blkio_open(argv[1]);
+	if (!dev) {
+		fprintf(stderr, "Failed to open device file\n");
+		return 1;
+	}
+	
+	printf("Device capacity is: %llu MiB\n", (dev->len >> 20));
+	
+	printf("Dumping the first sector...\n");
+	unsigned char *ptr = (unsigned char *)dev->base;
+	for (int i=0; i<512; i++) {
+		printf("%x ", ptr[i]);
+		if (i&0x7)
+			printf("\n");
+	}
+	
+	blkio_close(dev);
+	
+	return 0;
+}

osufs/osufs/osufs.c

+//
+//  osufs.c
+//  osufs
+//
+//  Created by Fang Lu on 11/28/17.
+//  Copyright © 2017 Fang Lu. All rights reserved.
+//
+
+#include "osufs.h"

osufs/osufs/osufs.h

+//
+//  osufs.h
+//  osufs
+//
+//  Created by Fang Lu on 11/28/17.
+//  Copyright © 2017 Fang Lu. All rights reserved.
+//
+
+#ifndef osufs_h
+#define osufs_h
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+#include <stdio.h>
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* osufs_h */