118 lines
2.6 KiB
JavaScript
118 lines
2.6 KiB
JavaScript
var Stream = require('stream').Stream
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module.exports = legacy
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function legacy (fs) {
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return {
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ReadStream: ReadStream,
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WriteStream: WriteStream
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}
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function ReadStream (path, options) {
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if (!(this instanceof ReadStream)) return new ReadStream(path, options);
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Stream.call(this);
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var self = this;
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this.path = path;
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this.fd = null;
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this.readable = true;
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this.paused = false;
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this.flags = 'r';
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this.mode = 438; /*=0666*/
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this.bufferSize = 64 * 1024;
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options = options || {};
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// Mixin options into this
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var keys = Object.keys(options);
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for (var index = 0, length = keys.length; index < length; index++) {
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var key = keys[index];
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this[key] = options[key];
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}
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if (this.encoding) this.setEncoding(this.encoding);
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if (this.start !== undefined) {
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if ('number' !== typeof this.start) {
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throw TypeError('start must be a Number');
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}
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if (this.end === undefined) {
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this.end = Infinity;
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} else if ('number' !== typeof this.end) {
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throw TypeError('end must be a Number');
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}
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if (this.start > this.end) {
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throw new Error('start must be <= end');
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}
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this.pos = this.start;
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}
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if (this.fd !== null) {
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process.nextTick(function() {
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self._read();
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});
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return;
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}
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fs.open(this.path, this.flags, this.mode, function (err, fd) {
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if (err) {
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self.emit('error', err);
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self.readable = false;
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return;
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}
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self.fd = fd;
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self.emit('open', fd);
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self._read();
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})
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}
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function WriteStream (path, options) {
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if (!(this instanceof WriteStream)) return new WriteStream(path, options);
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Stream.call(this);
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this.path = path;
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this.fd = null;
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this.writable = true;
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this.flags = 'w';
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this.encoding = 'binary';
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this.mode = 438; /*=0666*/
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this.bytesWritten = 0;
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options = options || {};
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// Mixin options into this
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var keys = Object.keys(options);
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for (var index = 0, length = keys.length; index < length; index++) {
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var key = keys[index];
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this[key] = options[key];
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}
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if (this.start !== undefined) {
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if ('number' !== typeof this.start) {
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throw TypeError('start must be a Number');
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}
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if (this.start < 0) {
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throw new Error('start must be >= zero');
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}
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this.pos = this.start;
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}
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this.busy = false;
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this._queue = [];
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if (this.fd === null) {
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this._open = fs.open;
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this._queue.push([this._open, this.path, this.flags, this.mode, undefined]);
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this.flush();
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}
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}
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}
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