82 lines
2.1 KiB
C++
82 lines
2.1 KiB
C++
#include <stdio.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/ioctl.h>
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#include <linux/fs.h>
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class RawDisk{
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int fd;
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const char* dir;
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u_int64_t numSectors;
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u_int64_t diskSize;
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public:
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RawDisk(const char *directory) : fd(-1), dir(nullptr), numSectors(0), diskSize(0) {
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dir = directory;
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/*dir = strdup("/dev/vdc");
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numSectors = 62914560;
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diskSize = 32212254720;*/
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// Open the block device (replace /dev/sdX with the actual device)
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fd = open(dir, O_RDWR); // Allow read and write
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if (fd == -1) {
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perror("Error opening device");
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exit(1);
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}
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// Use ioctl with BLKGETSIZE to get the number of sectors
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if (ioctl(fd, BLKGETSIZE64, &diskSize) == -1) {
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perror("Error getting disk size");
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close(fd);
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exit(1);
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}
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// Calculate the size in bytes
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numSectors = diskSize / 512; // Assuming a sector size of 512 bytes
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printf("====Initializing RawDisk====\n");
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printf("Number of sectors: %llu\n", numSectors);
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printf("Disk size (in bytes): %llu\n", diskSize);
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}
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~RawDisk() {
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if (fd != -1) {
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close(fd);
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}
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}
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int rawdisk_read(u_int64_t offset, char *buffer, size_t length) {
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if (lseek(fd, offset, SEEK_SET) == (u_int64_t)-1) {
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perror("Error seeking to offset");
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return -1;
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}
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ssize_t bytesRead = read(fd, buffer, length);
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if (bytesRead == -1) {
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perror("Error reading from device");
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return -1;
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}
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return 0;
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}
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// Write a specified number of bytes at a given byte offset
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int rawdisk_write(u_int64_t offset, char *buffer, size_t length) {
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if (lseek(fd, offset, SEEK_SET) == (u_int64_t)-1) {
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perror("Error seeking to offset");
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return -1;
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}
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ssize_t bytesWritten = write(fd, buffer, length);
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if (bytesWritten == -1) {
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perror("Error writing to device");
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return -1;
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}
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return 0;
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}
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}; |