New files to support I/O restructuring and (currently broken) Windows
version.
diff --git a/diskio-windows.cc b/diskio-windows.cc
new file mode 100644
index 0000000..84b77ee
--- /dev/null
+++ b/diskio-windows.cc
@@ -0,0 +1,345 @@
+//
+// C++ Interface: diskio (Windows-specific components)
+//
+// Description: Class to handle low-level disk I/O for GPT fdisk
+//
+//
+// Author: Rod Smith <rodsmith@rodsbooks.com>, (C) 2009
+//
+// Copyright: See COPYING file that comes with this distribution
+//
+//
+// This program is copyright (c) 2009, 2010 by Roderick W. Smith. It is distributed
+// under the terms of the GNU GPL version 2, as detailed in the COPYING file.
+
+#define __STDC_LIMIT_MACROS
+#define __STDC_CONSTANT_MACROS
+
+#include <windows.h>
+#include <winioctl.h>
+#define fstat64 fstat
+#define stat64 stat
+#define S_IRGRP 0
+#define S_IROTH 0
+#include <stdio.h>
+#include <string>
+#include <stdint.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <iostream>
+
+#include "support.h"
+#include "diskio.h"
+
+using namespace std;
+
+// Returns the official Windows name for a shortened version of same.
+void DiskIO::MakeRealName(void) {
+ int colonPos;
+
+ colonPos = userFilename.find(':', 0);
+ if ((colonPos != string::npos) && (colonPos <= 3)) {
+ realFilename = "\\\\.\\physicaldrive";
+ realFilename += userFilename.substr(0, colonPos);
+ } // if/else
+ printf("Exiting DiskIO::MakeRealName(); translated '%s' ", userFilename.c_str());
+ printf("to '%s'\n", realFilename.c_str());
+} // DiskIO::MakeRealName()
+
+// Open the currently on-record file for reading
+int DiskIO::OpenForRead(void) {
+ int shouldOpen = 1;
+
+ if (isOpen) { // file is already open
+ if (openForWrite) {
+ Close();
+ } else {
+ shouldOpen = 0;
+ } // if/else
+ } // if
+
+ if (shouldOpen) {
+ printf("Opening '%s' for reading.\n", realFilename.c_str());
+ fd = CreateFile(realFilename.c_str(),GENERIC_READ, FILE_SHARE_READ | FILE_SHARE_WRITE,
+ NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL);
+ if (fd == INVALID_HANDLE_VALUE) {
+ CloseHandle(fd);
+ fprintf(stderr, "Problem opening %s for reading!\n", realFilename.c_str());
+ realFilename = "";
+ userFilename = "";
+ isOpen = 0;
+ openForWrite = 0;
+ } else {
+ isOpen = 1;
+ openForWrite = 0;
+ } // if/else
+ } // if
+
+ return isOpen;
+} // DiskIO::OpenForRead(void)
+
+// An extended file-open function. This includes some system-specific checks.
+// Returns 1 if the file is open, 0 otherwise....
+int DiskIO::OpenForWrite(void) {
+ if ((isOpen) && (openForWrite))
+ return 1;
+
+ // Close the disk, in case it's already open for reading only....
+ Close();
+
+ // try to open the device; may fail....
+ fd = CreateFile(realFilename.c_str(), GENERIC_READ | GENERIC_WRITE,
+ FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING,
+ FILE_ATTRIBUTE_NORMAL, NULL);
+ if (fd == INVALID_HANDLE_VALUE) {
+ CloseHandle(fd);
+ isOpen = 1;
+ openForWrite = 1;
+ } else {
+ isOpen = 0;
+ openForWrite = 0;
+ } // if/else
+ return isOpen;
+} // DiskIO::OpenForWrite(void)
+
+// Close the disk device. Note that this does NOT erase the stored filenames,
+// so the file can be re-opened without specifying the filename.
+void DiskIO::Close(void) {
+ if (isOpen)
+ CloseHandle(fd);
+ isOpen = 0;
+ openForWrite = 0;
+} // DiskIO::Close()
+
+// Returns block size of device pointed to by fd file descriptor. If the ioctl
+// returns an error condition, print a warning but return a value of SECTOR_SIZE
+// (512)..
+int DiskIO::GetBlockSize(void) {
+ int err;
+ DWORD blockSize, junk1, junk2, junk3;
+
+ // If disk isn't open, try to open it....
+ if (!isOpen) {
+ OpenForRead();
+ } // if
+
+ if (isOpen) {
+/* BOOL WINAPI GetDiskFreeSpace(
+ __in LPCTSTR lpRootPathName,
+ __out LPDWORD lpSectorsPerCluster,
+ __out LPDWORD lpBytesPerSector,
+ __out LPDWORD lpNumberOfFreeClusters,
+ __out LPDWORD lpTotalNumberOfClusters
+ ); */
+// err = GetDiskFreeSpace(realFilename.c_str(), &junk1, &blockSize, &junk2, &junk3);
+ err = 1;
+ blockSize = 512;
+
+ if (err == 0) {
+ blockSize = SECTOR_SIZE;
+ // ENOTTY = inappropriate ioctl; probably being called on a disk image
+ // file, so don't display the warning message....
+ // 32-bit code returns EINVAL, I don't know why. I know I'm treading on
+ // thin ice here, but it should be OK in all but very weird cases....
+ if ((errno != ENOTTY) && (errno != EINVAL)) {
+ printf("\aError %d when determining sector size! Setting sector size to %d\n",
+ GetLastError(), SECTOR_SIZE);
+ } // if
+ } // if (err == -1)
+ } // if (isOpen)
+
+ return (blockSize);
+} // DiskIO::GetBlockSize()
+
+// Resync disk caches so the OS uses the new partition table. This code varies
+// a lot from one OS to another.
+void DiskIO::DiskSync(void) {
+ int i;
+
+ // If disk isn't open, try to open it....
+ if (!isOpen) {
+ OpenForRead();
+ } // if
+
+ if (isOpen) {
+#ifndef MINGW
+ sync();
+#endif
+#ifdef MINGW
+ printf("Warning: I don't know how to sync disks in Windows! The old partition table is\n"
+ "probably still in use!\n");
+#endif
+ } // if (isOpen)
+} // DiskIO::DiskSync()
+
+// Seek to the specified sector. Returns 1 on success, 0 on failure.
+int DiskIO::Seek(uint64_t sector) {
+ int retval = 1;
+ LARGE_INTEGER seekTo;
+ uint32_t lowBits, highBits;
+ uint64_t bytePos;
+
+ // If disk isn't open, try to open it....
+ if (!isOpen) {
+ retval = OpenForRead();
+ } // if
+
+ if (isOpen) {
+ bytePos = sector * (uint64_t) GetBlockSize();
+ lowBits = (uint32_t) (bytePos / UINT64_C(4294967296));
+ highBits = (uint32_t) (bytePos % UINT64_C(4294967296));
+ seekTo.LowPart = lowBits;
+ seekTo.HighPart = highBits;
+// seekTo.QuadPart = (LONGLONG) (sector * (uint64_t) GetBlockSize());
+/* printf("In DiskIO::Seek(), sector = %llu, ", sector);
+ printf("block size = %d, ", GetBlockSize());
+ printf("seekTo.QuadPart = %lld\n", seekTo.QuadPart);
+ printf(" seekTo.LowPart = %lu, ", seekTo.LowPart);
+ printf("seekTo.HighPart = %lu\n", seekTo.HighPart); */
+ retval = SetFilePointerEx(fd, seekTo, NULL, FILE_BEGIN);
+ if (retval == 0) {
+ errno = GetLastError();
+ fprintf(stderr, "Error when seeking to %lld! Error is %d\n",
+ seekTo.QuadPart, errno);
+ retval = 0;
+ } // if
+ } // if
+ return retval;
+} // DiskIO::Seek()
+
+// A variant on the standard read() function. Done to work around
+// limitations in FreeBSD concerning the matching of the sector
+// size with the number of bytes read.
+// Returns the number of bytes read into buffer.
+int DiskIO::Read(void* buffer, int numBytes) {
+ int blockSize = 512, i, numBlocks;
+ char* tempSpace;
+ DWORD retval = 0;
+
+ // If disk isn't open, try to open it....
+ if (!isOpen) {
+ OpenForRead();
+ } // if
+
+ if (isOpen) {
+ // Compute required space and allocate memory
+ blockSize = GetBlockSize();
+ if (numBytes <= blockSize) {
+ numBlocks = 1;
+ tempSpace = (char*) malloc(blockSize);
+ } else {
+ numBlocks = numBytes / blockSize;
+ if ((numBytes % blockSize) != 0) numBlocks++;
+ tempSpace = (char*) malloc(numBlocks * blockSize);
+ } // if/else
+
+ // Read the data into temporary space, then copy it to buffer
+// retval = read(fd, tempSpace, numBlocks * blockSize);
+ ReadFile(fd, tempSpace, numBlocks * blockSize, &retval, NULL);
+ printf("In DiskIO::Read(), have read %d bytes.\n", (int) retval);
+ for (i = 0; i < numBytes; i++) {
+ ((char*) buffer)[i] = tempSpace[i];
+ } // for
+
+ // Adjust the return value, if necessary....
+ if (((numBlocks * blockSize) != numBytes) && (retval > 0))
+ retval = numBytes;
+
+ free(tempSpace);
+ } // if (isOpen)
+ return retval;
+} // DiskIO::Read()
+
+// A variant on the standard write() function. Done to work around
+// limitations in FreeBSD concerning the matching of the sector
+// size with the number of bytes read.
+// Returns the number of bytes written.
+int DiskIO::Write(void* buffer, int numBytes) {
+ int blockSize = 512, i, numBlocks, retval = 0;
+ char* tempSpace;
+ DWORD numWritten;
+
+ // If disk isn't open, try to open it....
+ if ((!isOpen) || (!openForWrite)) {
+ OpenForWrite();
+ } // if
+
+ if (isOpen) {
+ // Compute required space and allocate memory
+ blockSize = GetBlockSize();
+ if (numBytes <= blockSize) {
+ numBlocks = 1;
+ tempSpace = (char*) malloc(blockSize);
+ } else {
+ numBlocks = numBytes / blockSize;
+ if ((numBytes % blockSize) != 0) numBlocks++;
+ tempSpace = (char*) malloc(numBlocks * blockSize);
+ } // if/else
+
+ // Copy the data to my own buffer, then write it
+ for (i = 0; i < numBytes; i++) {
+ tempSpace[i] = ((char*) buffer)[i];
+ } // for
+ for (i = numBytes; i < numBlocks * blockSize; i++) {
+ tempSpace[i] = 0;
+ } // for
+// retval = write(fd, tempSpace, numBlocks * blockSize);
+ WriteFile(fd, tempSpace, numBlocks * blockSize, &numWritten, NULL);
+ retval = (int) numWritten;
+
+ // Adjust the return value, if necessary....
+ if (((numBlocks * blockSize) != numBytes) && (retval > 0))
+ retval = numBytes;
+
+ free(tempSpace);
+ } // if (isOpen)
+ return retval;
+} // DiskIO:Write()
+
+// Returns the size of the disk in blocks.
+uint64_t DiskIO::DiskSize(int *err) {
+ uint64_t sectors = 0; // size in sectors
+ off_t bytes = 0; // size in bytes
+ struct stat64 st;
+ GET_LENGTH_INFORMATION buf;
+ DWORD i;
+
+ // If disk isn't open, try to open it....
+ if (!isOpen) {
+ OpenForRead();
+ } // if
+
+ if (isOpen) {
+ // Note to self: I recall testing a simplified version of
+ // this code, similar to what's in the __APPLE__ block,
+ // on Linux, but I had some problems. IIRC, it ran OK on 32-bit
+ // systems but not on 64-bit. Keep this in mind in case of
+ // 32/64-bit issues on MacOS....
+/* HANDLE fin;
+ fin = CreateFile(realFilename.c_str(), GENERIC_READ,
+ FILE_SHARE_READ|FILE_SHARE_WRITE,
+ NULL, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, NULL); */
+ if (DeviceIoControl(fd, IOCTL_DISK_GET_LENGTH_INFO, NULL, 0, &buf, sizeof(buf), &i, NULL)) {
+ sectors = (uint64_t) buf.Length.QuadPart / GetBlockSize();
+// printf("disk_get_size_win32 IOCTL_DISK_GET_LENGTH_INFO = %llu\n",
+// (long long unsigned) sectors);
+ } else {
+ fprintf(stderr, "Couldn't determine disk size!\n");
+ }
+
+/* // The above methods have failed, so let's assume it's a regular
+ // file (a QEMU image, dd backup, or what have you) and see what
+ // fstat() gives us....
+ if ((sectors == 0) || (*err == -1)) {
+ if (fstat64(fd, &st) == 0) {
+ bytes = (off_t) st.st_size;
+ if ((bytes % UINT64_C(512)) != 0)
+ fprintf(stderr, "Warning: File size is not a multiple of 512 bytes!"
+ " Misbehavior is likely!\n\a");
+ sectors = bytes / UINT64_C(512);
+ } // if
+ } // if */
+ } // if (isOpen)
+ return sectors;
+} // DiskIO::DiskSize()