// Copyright (c) 2012 Kuba Niegowski
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.
'use strict';
var SyncReader = module.exports = function (buffer) {
this._buffer = buffer;
this._reads = [];
};
SyncReader.prototype.read = function (length, callback) {
this._reads.push({
length: Math.abs(length), // if length < 0 then at most this length
allowLess: length < 0,
func: callback
});
};
SyncReader.prototype.process = function () {
// as long as there is any data and read requests
while (this._reads.length > 0 && this._buffer.length) {
var read = this._reads[0];
Eif (this._buffer.length && (this._buffer.length >= read.length || read.allowLess)) {
// ok there is any data so that we can satisfy this request
this._reads.shift(); // == read
var buf = this._buffer;
this._buffer = buf.slice(read.length);
read.func.call(this, buf.slice(0, read.length));
} else {
break;
}
}
if (this._reads.length > 0) {
return new Error('There are some read requests waitng on finished stream');
}
if (this._buffer.length > 0) {
return new Error('unrecognised content at end of stream');
}
};
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