pentadactyl-pm/chrome/content/vimperator/file.js

/***** BEGIN LICENSE BLOCK ***** {{{
Version: MPL 1.1/GPL 2.0/LGPL 2.1

The contents of this file are subject to the Mozilla Public License Version
1.1 (the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.mozilla.org/MPL/

Software distributed under the License is distributed on an "AS IS" basis,
WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
for the specific language governing rights and limitations under the
License.

(c) 2006-2007: Martin Stubenschrott <stubenschrott@gmx.net>
	Code based on venkman

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either the GNU General Public License Version 2 or later (the "GPL"), or
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in which case the provisions of the GPL or the LGPL are applicable instead
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}}} ***** END LICENSE BLOCK *****/


const PERM_IWOTH = 00002;  /* write permission, others */
const PERM_IWGRP = 00020;  /* write permission, group */

const MODE_RDONLY   = 0x01;
const MODE_WRONLY   = 0x02;
const MODE_RDWR     = 0x04;
const MODE_CREATE   = 0x08;
const MODE_APPEND   = 0x10;
const MODE_TRUNCATE = 0x20;
const MODE_SYNC     = 0x40;
const MODE_EXCL     = 0x80;


function fopen (path, mode, perms, tmp)
{
    return new LocalFile(path, mode, perms, tmp);
}

function LocalFile(file, mode, perms, tmp)
{
    const classes = Components.classes;
    const interfaces = Components.interfaces;

    const LOCALFILE_CTRID = "@mozilla.org/file/local;1";
    const FILEIN_CTRID = "@mozilla.org/network/file-input-stream;1";
    const FILEOUT_CTRID = "@mozilla.org/network/file-output-stream;1";
    const SCRIPTSTREAM_CTRID = "@mozilla.org/scriptableinputstream;1";
    
    const nsIFile = interfaces.nsIFile;
    const nsILocalFile = interfaces.nsILocalFile;
    const nsIFileOutputStream = interfaces.nsIFileOutputStream;
    const nsIFileInputStream = interfaces.nsIFileInputStream;
    const nsIScriptableInputStream = interfaces.nsIScriptableInputStream;
    
    if (typeof perms == "undefined")
        perms = 0666 & ~(PERM_IWOTH | PERM_IWGRP);

    if (typeof mode == "string")
    {
        switch (mode)
        {
            case ">":
                mode = MODE_WRONLY | MODE_CREATE | MODE_TRUNCATE;
                break;
            case ">>":
                mode = MODE_WRONLY | MODE_CREATE | MODE_APPEND;
                break;
            case "<":
                mode = MODE_RDONLY;
                break;
            default:
                throw "Invalid mode ``" + mode + "''";
        }
    }
        
    if (typeof file == "string")
    {
        this.localFile = classes[LOCALFILE_CTRID].createInstance(nsILocalFile);
        this.localFile.initWithPath(file);
        if (!this.localFile.exists())
            throw "No such file or directory";
    }
    else if (file instanceof nsILocalFile)
    {
        this.localFile = file;
        if (!this.localFile.exists())
            throw "No such file or directory";
    }
    else
    {
        throw "bad type for argument |file|.";
    }

    this.path = this.localFile.path;
    
    if (mode & (MODE_WRONLY | MODE_RDWR))
    {
        this.outputStream = 
            classes[FILEOUT_CTRID].createInstance(nsIFileOutputStream);
        this.outputStream.init(this.localFile, mode, perms, 0);
    }
    
    if (mode & (MODE_RDONLY | MODE_RDWR))
    {
        var is = classes[FILEIN_CTRID].createInstance(nsIFileInputStream);
        is.init(this.localFile, mode, perms, tmp);
        this.inputStream =
            classes[SCRIPTSTREAM_CTRID].createInstance(nsIScriptableInputStream);
        this.inputStream.init(is);
    }    
}


LocalFile.prototype.write =
function fo_write(buf)
{
    if (!("outputStream" in this))
        throw "file not open for writing.";
    
    return this.outputStream.write(buf, buf.length);
}

LocalFile.prototype.read =
function fo_read(max)
{
    if (this.localFile.isDirectory())
    {
        var entries = this.localFile.directoryEntries;
        var array = [];
        while(entries.hasMoreElements())
        {
            var entry = entries.getNext();
            entry.QueryInterface(Components.interfaces.nsIFile);
            array.push(entry);
        }
        return array;
    }

    if (!("inputStream" in this))
        throw "file not open for reading.";

    var av = this.inputStream.available();
    if (typeof max == "undefined")
        max = av;

    if (!av)
        return null;    
    
    var rv = this.inputStream.read(max);
    return rv;
}

LocalFile.prototype.close =
function fo_close()
{
    if ("outputStream" in this)
        this.outputStream.close();
    if ("inputStream" in this)
        this.inputStream.close();
}

LocalFile.prototype.flush =
function fo_close()
{
    return this.outputStream.flush();
}

// vim: set fdm=marker sw=4 ts=4 et: