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/*
* Copyright © 2009 Reinier Zwitserloot and Roel Spilker.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
package lombok.installer;
import java.util.ArrayList;
import java.util.List;
/**
* This class uses native calls on windows to figure out all drives,
* and, for each drive, if its a harddisk or something else.
*
* The output is essentially equivalent to running windows executable:
* <pre>fsutil fsinfo drives</pre>
* and
* <pre>fsutil fsinfo drivetype C:</pre>
*
* except that (A) fsutil requires privileges, (B) someone might have moved
* it out of the path or some such, and (C) its output is internationalized,
* so unless you want to include a table of how to say "Fixed Disk" in 300
* languages, this really is a superior solution.
* <p>
* To compile it, you'll need windows, as well as MinGW:
* http://sourceforge.net/projects/mingw/files/
* <p>
* Fetch gcc 4.0.4+, you don't need anything extra. Toss /c/mingw/bin in
* your git bash prompt's path (/etc/profile) and then run:
*
* $ gcc -c \
* -I "/c/Program Files/Java/jdk1.6.0_14/include" \
* -I "/c/Program Files/Java/jdk1.6.0_14/include/win32" \
* -D__int64="long long" lombok_installer_WindowsDriveInfo.c
*
* $ dllwrap.exe --add-stdcall-alias \
* -o WindowsDriveInfo.dll \
* lombok_installer_WindowsDriveInfo.o
*
* You may get a warning along the lines of "Creating an export definition".
* This is expected behaviour.
*
* The DLL produced has been checked into the git repository so you won't
* need to build this file again unless you make some changes to it.
*/
public class WindowsDriveInfo {
/**
* Return a list of all available drive letters, such as ["A", "C", "D"].
*/
public List<String> getLogicalDrives() {
int flags = getLogicalDrives0();
List<String> letters = new ArrayList<String>();
for ( int i = 0 ; i < 26 ; i++ ) {
if ( (flags & (1 << i)) != 0 ) letters.add(Character.toString((char)('A' + i)));
}
return letters;
}
/**
* Calls kernel32's GetLogicalDrives, which returns an int containing
* flags; bit 0 corresponds to drive A, bit 25 to drive Z. on = disk exists.
*/
private native int getLogicalDrives0();
/**
* Feed it a drive letter (such as 'A') to see if it is a fixed disk.
*/
public boolean isFixedDisk(String letter) {
if ( letter.length() != 1 ) throw new IllegalArgumentException("Supply 1 letter, not: " + letter);
char drive = Character.toUpperCase(letter.charAt(0));
if ( drive < 'A' || drive > 'Z' ) throw new IllegalArgumentException(
"A drive is indicated by a letter, so A-Z inclusive. Not " + drive);
return getDriveType(drive + ":\\") == 3L;
}
/**
* Mirror of kernel32's GetDriveTypeA. You must pass in 'A:\\' -
* so including both a colon and a backslash!
*
* 0 = error
* 1 = doesn't exist
* 2 = removable drive
* 3 = fixed disk
* 4 = remote (network) disk
* 5 = cd-rom
* 6 = ram disk
*/
private native int getDriveType(String name);
public static void main(String[] args) {
System.loadLibrary("WindowsDriveInfo");
WindowsDriveInfo info = new WindowsDriveInfo();
for ( String letter : info.getLogicalDrives() ) {
System.out.printf("Drive %s: - %s\n", letter,
info.isFixedDisk(letter) ? "Fixed Disk" : "Not Fixed Disk");
}
}
}
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