1 | var Stream = require('stream').Stream
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2 |
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3 | module.exports = legacy
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4 |
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5 | function legacy (fs) {
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6 | return {
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7 | ReadStream: ReadStream,
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8 | WriteStream: WriteStream
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9 | }
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10 |
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11 | function ReadStream (path, options) {
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12 | if (!(this instanceof ReadStream)) return new ReadStream(path, options);
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13 |
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14 | Stream.call(this);
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15 |
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16 | var self = this;
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17 |
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18 | this.path = path;
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19 | this.fd = null;
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20 | this.readable = true;
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21 | this.paused = false;
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22 |
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23 | this.flags = 'r';
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24 | this.mode = 438;
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25 | this.bufferSize = 64 * 1024;
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26 |
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27 | options = options || {};
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28 |
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29 |
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30 | var keys = Object.keys(options);
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31 | for (var index = 0, length = keys.length; index < length; index++) {
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32 | var key = keys[index];
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33 | this[key] = options[key];
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34 | }
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35 |
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36 | if (this.encoding) this.setEncoding(this.encoding);
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37 |
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38 | if (this.start !== undefined) {
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39 | if ('number' !== typeof this.start) {
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40 | throw TypeError('start must be a Number');
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41 | }
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42 | if (this.end === undefined) {
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43 | this.end = Infinity;
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44 | } else if ('number' !== typeof this.end) {
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45 | throw TypeError('end must be a Number');
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46 | }
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47 |
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48 | if (this.start > this.end) {
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49 | throw new Error('start must be <= end');
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50 | }
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51 |
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52 | this.pos = this.start;
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53 | }
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54 |
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55 | if (this.fd !== null) {
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56 | process.nextTick(function() {
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57 | self._read();
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58 | });
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59 | return;
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60 | }
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61 |
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62 | fs.open(this.path, this.flags, this.mode, function (err, fd) {
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63 | if (err) {
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64 | self.emit('error', err);
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65 | self.readable = false;
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66 | return;
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67 | }
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68 |
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69 | self.fd = fd;
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70 | self.emit('open', fd);
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71 | self._read();
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72 | })
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73 | }
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74 |
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75 | function WriteStream (path, options) {
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76 | if (!(this instanceof WriteStream)) return new WriteStream(path, options);
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77 |
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78 | Stream.call(this);
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79 |
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80 | this.path = path;
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81 | this.fd = null;
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82 | this.writable = true;
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83 |
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84 | this.flags = 'w';
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85 | this.encoding = 'binary';
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86 | this.mode = 438;
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87 | this.bytesWritten = 0;
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88 |
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89 | options = options || {};
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90 |
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91 |
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92 | var keys = Object.keys(options);
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93 | for (var index = 0, length = keys.length; index < length; index++) {
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94 | var key = keys[index];
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95 | this[key] = options[key];
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96 | }
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97 |
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98 | if (this.start !== undefined) {
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99 | if ('number' !== typeof this.start) {
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100 | throw TypeError('start must be a Number');
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101 | }
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102 | if (this.start < 0) {
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103 | throw new Error('start must be >= zero');
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104 | }
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105 |
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106 | this.pos = this.start;
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107 | }
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108 |
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109 | this.busy = false;
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110 | this._queue = [];
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111 |
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112 | if (this.fd === null) {
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113 | this._open = fs.open;
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114 | this._queue.push([this._open, this.path, this.flags, this.mode, undefined]);
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115 | this.flush();
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116 | }
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117 | }
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118 | }
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