4 // Description: Class to handle low-level disk I/O for GPT fdisk
56 // Open the currently on-record file for reading. Returns 1 if the file is
73       if (fd == -1) {  in OpenForRead()
118 // An extended file-open function. This includes some system-specific checks.
124    // Close the disk, in case it's already open for reading only....  in OpenForWrite()
146 // Close the disk device. Note that this does NOT erase the stored filenames,
147 // so the file can be re-opened without specifying the filename.
158 // (512). If the disk can't be opened at all, return a value of 0.
160    int err = -1, blockSize = 0;  in GetBlockSize()
165    // If disk isn't open, try to open it....  in GetBlockSize()
186       if (err == -1) {  in GetBlockSize()
188          // ENOTTY = inappropriate ioctl; probably being called on a disk image  in GetBlockSize()
190          // 32-bit code returns EINVAL, I don't know why. I know I'm treading on  in GetBlockSize()
195             cout << "Disk device is " << realFilename << "\n";  in GetBlockSize()
197       } // if (err == -1)  in GetBlockSize()
207    int err = -1, physBlockSize = 0;  in GetPhysBlockSize()
209    // If disk isn't open, try to open it....  in GetPhysBlockSize()
219    if (err == -1)  in GetPhysBlockSize()
232    // If disk isn't open, try to open it....  in GetNumHeads()
250    // If disk isn't open, try to open it....  in GetNumSecsPerTrack()
260 // Resync disk caches so the OS uses the new partition table. This code varies
268    // If disk isn't open, try to open it....  in DiskSync()
279                * it definitely will get things on disk though:  in DiskSync()
280                * http://topiks.org/mac-os-x/0321278542/ch12lev1sec8.html */  in DiskSync()
322    // If disk isn't open, try to open it....  in Seek()
345    // If disk isn't open, try to open it....  in Read()
388    // If disk isn't open, try to open it....  in Write()
434 // return correct values for disk image files.
444    // If disk isn't open, try to open it....  in DiskSize()
452       // on Linux, but I had some problems. IIRC, it ran OK on 32-bit  in DiskSize()
453       // systems but not on 64-bit. Keep this in mind in case of  in DiskSize()
454       // 32/64-bit issues on MacOS....  in DiskSize()
485       // Unintuitively, the above returns values in 512-byte blocks, no  in DiskSize()
496       if ((sectors == 0) || (*err == -1)) {  in DiskSize()