99 lines
No EOL
2.5 KiB
JavaScript
99 lines
No EOL
2.5 KiB
JavaScript
define(function() {
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/*
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Unfortunately, mimicking Node isn't really feasible given the Chrome OS security model, but we still don't want to deal with the annoying Chrome filesystem APIs. This module wraps those in a more usable File object.
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*/
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var File = function() {
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this.entry = null;
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};
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File.prototype = {
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open: function(mode, c) {
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var self = this;
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if (typeof mode == "function") {
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c = mode;
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mode = "open";
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}
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//mode is "open" or "save"
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var modes = {
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"open": "openWritableFile",
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"save": "saveFile"
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};
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chrome.fileSystem.chooseEntry({
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type: modes[mode]
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}, function(entry) {
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//cancelling acts like an error, but isn't.
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if (!entry) return;
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self.entry = entry;
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c(null, self)
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});
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},
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read: function(c) {
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if (!this.entry) {
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console.error(this);
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c("File not opened", null);
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}
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var reader = new FileReader();
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reader.onload = function() {
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c(null, reader.result);
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};
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reader.onerror = function() {
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console.error("File read error!");
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c(err, null);
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};
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this.entry.file(function(f) {
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reader.readAsText(f);
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});
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},
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write: function(data, c) {
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var self = this;
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c = c || function() {};
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this.entry.createWriter(function(writer) {
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writer.onerror = function(err) {
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console.error(err);
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c(err, self);
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}
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writer.onwriteend = function() {
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//after truncation, actually write the file
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writer.onwriteend = function() {
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c(null, self);
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}
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var blob = new Blob([data]);
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writer.write(blob);
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};
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writer.truncate(0);
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});
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},
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stat: function(c) {
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if (this.entry) {
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return this.entry.file(function(f) {
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c(null, f);
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});
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}
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return c("No entry");
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},
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retain: function() {
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return chrome.fileSystem.retainEntry(this.entry);
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},
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restore: function(id, c) {
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var self = this;
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chrome.fileSystem.isRestorable(id, function(is) {
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if (is) {
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chrome.fileSystem.restoreEntry(id, function(entry) {
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if (!entry) return c("Could not restore file", null);
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self.entry = entry;
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c(null, self);
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});
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} else {
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c("Could not restore file", null);
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}
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});
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}
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};
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return File;
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}); |