зеркало из https://github.com/mozilla/gecko-dev.git
124 строки
4.3 KiB
JavaScript
124 строки
4.3 KiB
JavaScript
/**
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* Read count bytes from stream and return as a String object
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*/
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function read_stream(stream, count) {
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/* assume stream has non-ASCII data */
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var wrapper =
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Components.classes["@mozilla.org/binaryinputstream;1"]
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.createInstance(Components.interfaces.nsIBinaryInputStream);
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wrapper.setInputStream(stream);
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/* JS methods can be called with a maximum of 65535 arguments, and input
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streams don't have to return all the data they make .available() when
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asked to .read() that number of bytes. */
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var data = [];
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while (count > 0) {
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var bytes = wrapper.readByteArray(Math.min(65535, count));
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data.push(String.fromCharCode.apply(null, bytes));
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count -= bytes.length;
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if (bytes.length == 0)
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do_throw("Nothing read from input stream!");
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}
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return data.join('');
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}
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const CL_EXPECT_FAILURE = 0x1;
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const CL_EXPECT_GZIP = 0x2;
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/**
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* A stream listener that calls a callback function with a specified
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* context and the received data when the channel is loaded.
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*
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* Signature of the closure:
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* void closure(in nsIRequest request, in ACString data, in JSObject context);
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*
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* This listener makes sure that various parts of the channel API are
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* implemented correctly and that the channel's status is a success code
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* (you can pass CL_EXPECT_FAILURE as flags to allow a failure code)
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*
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* Note that it also requires a valid content length on the channel and
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* is thus not fully generic.
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*/
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function ChannelListener(closure, ctx, flags) {
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this._closure = closure;
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this._closurectx = ctx;
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this._flags = flags;
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}
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ChannelListener.prototype = {
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_closure: null,
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_closurectx: null,
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_buffer: "",
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_got_onstartrequest: false,
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_got_onstoprequest: false,
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_contentLen: -1,
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QueryInterface: function(iid) {
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if (iid.equals(Components.interfaces.nsIStreamListener) ||
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iid.equals(Components.interfaces.nsIRequestObserver) ||
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iid.equals(Components.interfaces.nsISupports))
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return this;
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throw Components.results.NS_ERROR_NO_INTERFACE;
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},
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onStartRequest: function(request, context) {
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try {
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if (this._got_onstartrequest)
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do_throw("Got second onStartRequest event!");
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this._got_onstartrequest = true;
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request.QueryInterface(Components.interfaces.nsIChannel);
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this._contentLen = request.contentLength;
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if (this._contentLen == -1)
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do_throw("Content length is unknown in onStartRequest!");
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} catch (ex) {
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do_throw("Error in onStartRequest: " + ex);
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}
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},
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onDataAvailable: function(request, context, stream, offset, count) {
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try {
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if (!this._got_onstartrequest)
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do_throw("onDataAvailable without onStartRequest event!");
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if (this._got_onstoprequest)
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do_throw("onDataAvailable after onStopRequest event!");
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if (!request.isPending())
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do_throw("request reports itself as not pending from onDataAvailable!");
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if (this._flags & CL_EXPECT_FAILURE)
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do_throw("Got data despite expecting a failure");
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this._buffer = this._buffer.concat(read_stream(stream, count));
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} catch (ex) {
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do_throw("Error in onDataAvailable: " + ex);
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}
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},
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onStopRequest: function(request, context, status) {
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try {
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if (!this._got_onstartrequest)
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do_throw("onStopRequest without onStartRequest event!");
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if (this._got_onstoprequest)
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do_throw("Got second onStopRequest event!");
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this._got_onstoprequest = true;
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var success = Components.isSuccessCode(status);
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if ((this._flags & CL_EXPECT_FAILURE) && success)
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do_throw("Should have failed to load URL (status is " + status.toString(16) + ")");
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else if (!(this._flags & CL_EXPECT_FAILURE) && !success)
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do_throw("Failed to load URL: " + status.toString(16));
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if (status != request.status)
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do_throw("request.status does not match status arg to onStopRequest!");
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if (request.isPending())
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do_throw("request reports itself as pending from onStopRequest!");
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if (!(this._flags & CL_EXPECT_FAILURE) &&
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!(this._flags & CL_EXPECT_GZIP) &&
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this._contentLen != -1)
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do_check_eq(this._buffer.length, this._contentLen)
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} catch (ex) {
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do_throw("Error in onStopRequest: " + ex);
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}
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try {
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this._closure(request, this._buffer, this._closurectx);
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} catch (ex) {
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do_throw("Error in closure function: " + ex);
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}
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}
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};
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