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function parseQuery(request, key) {
var params = request.queryString.split('&');
for (var j = 0; j < params.length; ++j) {
var p = params[j];
if (p == key)
return true;
if (p.indexOf(key + "=") == 0)
return p.substring(key.length + 1);
if (p.indexOf("=") < 0 && key == "")
return p;
}
return false;
}
function push32BE(array, input) {
array.push(String.fromCharCode((input >> 24) & 0xff));
array.push(String.fromCharCode((input >> 16) & 0xff));
array.push(String.fromCharCode((input >> 8) & 0xff));
array.push(String.fromCharCode((input) & 0xff));
}
function push32LE(array, input) {
array.push(String.fromCharCode((input) & 0xff));
array.push(String.fromCharCode((input >> 8) & 0xff));
array.push(String.fromCharCode((input >> 16) & 0xff));
array.push(String.fromCharCode((input >> 24) & 0xff));
}
function push16LE(array, input) {
array.push(String.fromCharCode((input) & 0xff));
array.push(String.fromCharCode((input >> 8) & 0xff));
}
function buildWave(samples, sample_rate) {
const RIFF_MAGIC = 0x52494646;
const WAVE_MAGIC = 0x57415645;
const FRMT_MAGIC = 0x666d7420;
const DATA_MAGIC = 0x64617461;
const RIFF_SIZE = 44;
var header = [];
push32BE(header, RIFF_MAGIC);
push32LE(header, RIFF_SIZE + samples.length * 2);
push32BE(header, WAVE_MAGIC);
push32BE(header, FRMT_MAGIC);
push32LE(header, 16);
push16LE(header, 1);
push16LE(header, 1);
push32LE(header, sample_rate);
push32LE(header, sample_rate);
push16LE(header, 2);
push16LE(header, 16);
push32BE(header, DATA_MAGIC);
push32LE(header, samples.length * 2);
for (var i = 0; i < samples.length; ++i) {
push16LE(header, samples[i], 2);
}
return header;
}
const CC = Components.Constructor;
const Timer = CC("@mozilla.org/timer;1", "nsITimer", "initWithCallback");
const BinaryOutputStream = CC("@mozilla.org/binaryoutputstream;1",
"nsIBinaryOutputStream",
"setOutputStream");
function poll(f) {
if (f()) {
return;
}
new Timer(function() { poll(f); }, 100, Ci.nsITimer.TYPE_ONE_SHOT);
}
function handleRequest(request, response)
{
var cancel = parseQuery(request, "cancelkey");
if (cancel) {
setState(cancel[1], "cancelled");
response.setStatusLine(request.httpVersion, 200, "OK");
response.write("Cancel approved!");
return;
}
var samples = [];
for (var i = 0; i < 1000000; ++i) {
samples.push(0);
}
var bytes = buildWave(samples, 44100).join("");
var key = parseQuery(request, "key");
response.setHeader("Content-Type", "audio/x-wav");
response.setHeader("Content-Length", ""+bytes.length, false);
var out = new BinaryOutputStream(response.bodyOutputStream);
var start = 0, end = bytes.length - 1;
if (request.hasHeader("Range"))
{
var rangeMatch = request.getHeader("Range").match(/^bytes=(\d+)?-(\d+)?$/);
if (rangeMatch[1] !== undefined)
start = parseInt(rangeMatch[1], 10);
if (rangeMatch[2] !== undefined)
end = parseInt(rangeMatch[2], 10);
// No start given, so the end is really the count of bytes from the
// end of the file.
if (start === undefined)
{
start = Math.max(0, bytes.length - end);
end = bytes.length - 1;
}
// start and end are inclusive
if (end === undefined || end >= bytes.length)
end = bytes.length - 1;
if (end < start)
{
response.setStatusLine(request.httpVersion, 200, "OK");
start = 0;
end = bytes.length - 1;
}
else
{
response.setStatusLine(request.httpVersion, 206, "Partial Content");
var contentRange = "bytes " + start + "-" + end + "/" + bytes.length;
response.setHeader("Content-Range", contentRange);
}
}
if (start > 0) {
// Send all requested data
out.write(bytes.slice(start, end + 1), end + 1 - start);
return;
}
// Write the first 1.2M of the Wave file. We know the cache size is set to
// 100K so this will fill the cache and and cause a "suspend" event on
// the loading element.
out.write(bytes, 1200000);
response.processAsync();
// Now wait for the message to cancel this response
poll(function() {
if (getState(key[1]) != "cancelled") {
return false;
}
response.finish();
return true;
});
}