[ http://issues.apache.org/jira/browse/IO-90?page=all ]
Henri Yandell updated IO-90:
----------------------------
Fix Version/s: 1.3
An important fix for 1.3.
> Infinite loop in FileSystemUtils.freeSpaceWindows if share directory empty
> --------------------------------------------------------------------------
>
> Key: IO-90
> URL: http://issues.apache.org/jira/browse/IO-90
> Project: Commons IO
> Issue Type: Bug
> Components: Utilities
> Affects Versions: 1.2
> Environment: Windows NT or higher
> Reporter: Thomas Ledoux
> Fix For: 1.3
>
>
> When using FileSystemUtils.freeSpaceWindows in an empty share directory, the
> line containing the free space does not exist which causes an infinite loop
> (the outerloop doesn't decrease the i index).
> In fact to deal with all possible errors, I propose to test the exitCode of
> the dir command.
> Here is a proposed new code for this function :
> /**
> * Find free space on the Windows platform using the 'dir' command.
> *
> * @param path the path to get free space for, including the colon
> * @return the amount of free drive space on the drive
> * @throws IOException if an error occurs
> */
> long freeSpaceWindows(String path) throws IOException {
> path = FilenameUtils.normalize(path);
> if (path.length() > 2 && path.charAt(1) == ':') {
> path = path.substring(0, 2); // seems to make it work
> }
> // build and run the 'dir' command
> String[] cmdAttrbs = new String[] {"cmd.exe", "/C", "dir /-c " +
> path};
> // read in the output of the command to an ArrayList
> BufferedReader in = null;
> String line = null;
> ArrayList lines = new ArrayList();
> int errorLevel = 0;
>
> try {
> Process proc = Runtime.getRuntime().exec(cmdAttrbs);
> in = new BufferedReader(
> new InputStreamReader(proc.getInputStream()));
> line = in.readLine();
> while (line != null) {
> line = line.toLowerCase().trim();
> lines.add(line);
> line = in.readLine();
> }
>
> proc.waitFor();
> errorLevel = proc.exitValue();
>
> } finally {
> IOUtils.closeQuietly(in);
> }
> if (lines.size() == 0) {
> // unknown problem, throw exception
> throw new IOException(
> "Command line 'dir /-c' did not return any info " +
> "for command '" + cmdAttrbs[2] + "'");
> }
> if (errorLevel != 0) {
> if (errorLevel == 2) {
> // Empty directory : unable to calculate the freeSpace
> return Integer.MAX_VALUE; // ???
> } else {
> // unknown problem, throw exception
> throw new IOException(
> "Command line 'dir /-c' error [" + errorLevel +
> "] for command '" + cmdAttrbs[2] + "'");
> }
> }
>
> // now iterate over the lines we just read and find the LAST
> // non-empty line (the free space bytes should be in the last element
> // of the ArrayList anyway, but this will ensure it works even if it's
> // not, still assuming it is on the last non-blank line)
> long bytes = -1;
> int i = lines.size() - 1;
> int bytesStart = 0;
> int bytesEnd = 0;
> outerLoop: while (i > 0) {
> line = (String) lines.get(i);
> if (line.length() > 0) {
> // found it, so now read from the end of the line to find the
> // last numeric character on the line, then continue until we
> // find the first non-numeric character, and everything
> between
> // that and the last numeric character inclusive is our free
> // space bytes count
> int j = line.length() - 1;
> innerLoop1: while (j >= 0) {
> char c = line.charAt(j);
> if (Character.isDigit(c)) {
> // found the last numeric character, this is the end of
> // the free space bytes count
> bytesEnd = j + 1;
> break innerLoop1;
> }
> j--;
> }
> innerLoop2: while (j >= 0) {
> char c = line.charAt(j);
> if (!Character.isDigit(c) && c != ',' && c != '.') {
> // found the next non-numeric character, this is the
> // beginning of the free space bytes count
> bytesStart = j + 1;
> break innerLoop2;
> }
> j--;
> }
> break outerLoop;
> } else {
> // If the last line is empty we are unable to parse the
> freeSpace
> throw new IOException(
> "Command line 'dir /-c' did not return valid info " +
> "for command '" + cmdAttrbs[2] + "'");
> }
> }
> // remove commas and dots in the bytes count
> StringBuffer buf = new StringBuffer(line.substring(bytesStart,
> bytesEnd));
> for (int k = 0; k < buf.length(); k++) {
> if (buf.charAt(k) == ',' || buf.charAt(k) == '.') {
> buf.deleteCharAt(k--);
> }
> }
> bytes = Long.parseLong(buf.toString());
> return bytes;
> }
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