C++ Partition::IsExtended方法代码示例

bool
PartitionMap::Check(off_t sessionSize) const
{
	int32 partitionCount = CountPartitions();

	// 1. check partition locations
	for (int32 i = 0; i < partitionCount; i++) {
		if (!PartitionAt(i)->CheckLocation(sessionSize))
			return false;
	}

	// 2. check overlapping of partitions and location of partition tables
	bool result = true;
	Partition** byOffset = new(nothrow) Partition*[partitionCount];
	off_t* tableOffsets = new(nothrow) off_t[partitionCount - 3];
	if (byOffset && tableOffsets) {
		// fill the arrays
		int32 byOffsetCount = 0;
		int32 tableOffsetCount = 1;	// primary partition table
		tableOffsets[0] = 0;
		for (int32 i = 0; i < partitionCount; i++) {
			Partition* partition = (Partition*)PartitionAt(i);
			if (!partition->IsExtended())
				byOffset[byOffsetCount++] = partition;

			// add only logical partition partition table locations
			if (i >= 4) {
				tableOffsets[tableOffsetCount++]
					= partition->PartitionTableOffset();
			}
		}

		// sort the arrays
		qsort(byOffset, byOffsetCount, sizeof(Partition*),
			cmp_partition_offset);
		qsort(tableOffsets, tableOffsetCount, sizeof(off_t), cmp_offset);

		// check for overlappings
		off_t nextOffset = 0;
		for (int32 i = 0; i < byOffsetCount; i++) {
			Partition* partition = byOffset[i];
			if (partition->Offset() < nextOffset && i > 0) {
				Partition* previousPartition = byOffset[i - 1];
				off_t previousSize = previousPartition->Size()
					- (nextOffset - partition->Offset());
				TRACE(("intel: PartitionMap::Check(): "));
				if (previousSize == 0) {
					previousPartition->Unset();
					TRACE(("partition offset hides previous partition."
						" Removing previous partition from disk layout.\n"));
				} else {
					TRACE(("overlapping partitions! Setting partition %ld "
						"size to %lld\n", i - 1, previousSize));
					previousPartition->SetSize(previousSize);
				}
			}
			nextOffset = partition->Offset() + partition->Size();
		}

		// check uniqueness of partition table offsets and whether they lie
		// outside of the non-extended partitions
		if (result) {
			for (int32 i = 0; i < tableOffsetCount; i++) {
				if (i > 0 && tableOffsets[i] == tableOffsets[i - 1]) {
					TRACE(("intel: PartitionMap::Check(): same partition table "
						"for different extended partitions!\n"));
					result = false;
					break;
				} else if (is_inside_partitions(tableOffsets[i],
						(const Partition**)byOffset, byOffsetCount)) {
					TRACE(("intel: PartitionMap::Check(): a partition table "
						"lies inside a non-extended partition!\n"));
					result = false;
					break;
				}
			}
		}
	} else
		result = false;		// no memory: assume failure

	// cleanup
	delete[] byOffset;
	delete[] tableOffsets;

	return result;
}

//.........这里部分代码省略.........

					// get device size
					int64 deviceSize;
					if (ioctl(baseFD, DIOCGMEDIASIZE, &deviceSize) == -1) {
						fprintf(stderr, "Error: Failed to get device geometry "
							"for \"%s\": %s\n", baseDeviceName,
							strerror(errno));
						exit(1);
					}

					// parse the partition map
					// TODO: block size!
					PartitionMapParser parser(baseFD, 0, deviceSize, 512);
					PartitionMap map;
					error = parser.Parse(NULL, &map);
					if (error != B_OK) {
						fprintf(stderr, "Error: Parsing partition table on "
							"device \"%s\" failed: %s\n", baseDeviceName,
							strerror(error));
						exit(1);
					}

					close(baseFD);

					// check the partition we are supposed to write at
					Partition *partition = map.PartitionAt(partitionIndex - 1);
					if (!partition || partition->IsEmpty()) {
						fprintf(stderr, "Error: Invalid partition index %d.\n",
							partitionIndex);
						dump_partition_map(map);
						exit(1);
					}

					if (partition->IsExtended()) {
						fprintf(stderr, "Error: Partition %d is an extended "
							"partition.\n", partitionIndex);
						dump_partition_map(map);
						exit(1);
					}

					partitionOffset = partition->Offset();

				} else {
					// The given device is the base device. We'll write at
					// offset 0.
				}

			#endif // ANTARES_HOST_PLATFORM_FREEBSD

		} else if (S_ISBLK(st.st_mode)) {
			// block device: a device or partition under Linux or Darwin
			#ifdef ANTARES_HOST_PLATFORM_LINUX

				// chop off the trailing number
				int fileNameLen = strlen(fileName);
				int baseNameLen = -1;
				for (int k = fileNameLen - 1; k >= 0; k--) {
					if (!isdigit(fileName[k])) {
						baseNameLen = k + 1;
						break;
					}
				}

				if (baseNameLen < 0) {
					// only digits?
					fprintf(stderr, "Error: Failed to get base device name.\n");