CFLib.org – Common Function Library Project

Description:
This function takes one or two parameters (the FULL absolute path to the file to be unzipped) and optionally a directory to unzip the contained file to. Note that this does not extract files in a tar.gz file (it only removes the gzip compression). It assumes that both the source file and option destination exist and are valid.

Return Values:
Returns a boolean.

Example:

<cfset result = gunzipFile(expandPath("./Ray Bio.doc.gz"), "c:\flextemp")>
<cfoutput>#result#</cfoutput>

Parameters:

Full UDF Source:

/**
 * Unzip a gzipped (.gz) file.
 * 
 * @param infilePath      Full path to gz file. (Required)
 * @param outputPath      Where to extract the gzfile. Defaults to current directory. (Optional)
 * @return Returns a boolean. 
 * @author Vaughan Allan (vallan@abnamromorgans.com.au) 
 * @version 1, May 3, 2010 
 */
function gunzipFile(infilePath) {
    var zipfile = "";
    var outfile = "";
    var outputPath = "";
    var infile = "";
    var gzInStream = createObject('java','java.util.zip.GZIPInputStream');
    var outStream = createObject('java','java.io.FileOutputStream');
    var inStream = createObject('java','java.io.FileInputStream');
    var buffer = repeatString(" ",1024).getBytes();
    var length = 0;
    var rv = true;
   
    if (arrayLen(Arguments) gte 2) outputPath = arguments[2];
    else outputPath = getDirectoryFromPath(infilePath);

    if (right(infilePath,3) neq '.gz') infilePath = infilePath & '.gz';

    if(right(outputPath,1) neq "/" and right(outputPath,1) neq "\") outputPath = outputPath & "/";
   
    try {
        infile = getFileFromPath(infilePath);
        outfile = outputPath & left(infile,len(infile) - 3);
        inStream.init(infilePath);
        gzInStream.init(inStream);
        outStream.init(outfile);
        do {
            length = gzInStream.read(buffer,0,1024);
            if (length neq -1) outStream.write(buffer,0,length);
        } while (length neq -1);
        outStream.close();
        gzInStream.close();
    } 
    catch (any e) {
        rv = false;
        try {
            outStream.close();
        } catch (any e) { }
            try {
                gzInStream.close();
            } catch (any e) { }
    }
    return rv;
}