packer.js ➔ write32FTyped_ - Code Metrics - Inspection of "Move browser test page to docs/ to use GitHub Page..." - rochars/byte-data - Measure and Improve Code Quality continuously with Scrutinizer

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by Rafael S.

created 2018-07-26 06:27 UTC

packer.js ➔ write32FTyped_ A

↳ Parent: lib/packer.js

Complexity

Conditions	2
Paths	2

Size

Total Lines	7
Code Lines	5

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	2
eloc	5
c	0
b	0
f	0
nc	2
nop	3
dl	0
loc	7
rs	10

/*
 * Copyright (c) 2017-2018 Rafael da Silva Rocha.
 *
 * 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.
 *
 */

/**
 * @fileoverview Function to serialize binary data.
 * @see https://github.com/rochars/byte-data
 */

import Integer from './integer.js';
import {validateType} from './validation.js';
import {unpack, pack} from './IEEE754.js';

/**
 * A class to pack and unpack integers and floating-point numbers.
 * @extends {Integer}
 */
export default class Packer extends Integer {
  
  constructor() {
    super();
    /**
     * If TypedArrays are available or not
     * @type {boolean}
     */
    this.TYPED = typeof Uint8Array === 'function';
    /**
     * Use a Typed Array to check if the host is BE or LE. This will impact
     * on how 64-bit floating point numbers are handled.
     * @type {boolean}
     */
    let BE_ENV = false;
    if (this.TYPED) {
      BE_ENV = new Uint8Array(new Uint32Array([1]).buffer)[0] === 0;
    }
    /**
     * @type {number}
     * @private
     */
    this.HIGH_ = BE_ENV ? 1 : 0;
    /**
     * @type {number}
     * @private
     */
    this.LOW_ = BE_ENV ? 0 : 1;
    /**
     * @type {!Uint8Array|null}
     */
    let uInt8 = this.TYPED ? new Uint8Array(8) : null;
    /**
     * @type {!Uint32Array|null}
     * @private
     */
    this.ui32_ = this.TYPED ? new Uint32Array(uInt8.buffer) : null;
    /**
     * @type {!Float32Array|null}
     * @private
     */
    this.f32_ = this.TYPED ? new Float32Array(uInt8.buffer) : null;
    /**
     * @type {!Float64Array|null}
     * @private
     */
    this.f64_ = this.TYPED ? new Float64Array(uInt8.buffer) : null;
}

  /**
   * Set up the object to start serializing/deserializing a data type..
   * @param {!Object} theType The type definition.
   * @throws {Error} If the type definition is not valid.
   */
  setUp(theType) {
    validateType(theType);
    super.setUp({
      bits: theType.bits,
      signed: theType.float ? false : theType.signed});
    this.setReaderAndWriter_(theType);
  }

  /**
   * Read 1 16-bit float from bytes.
   * @see https://stackoverflow.com/a/8796597
   * @param {!Uint8Array|!Array<number>} bytes An array of bytes.
   * @param {number=} i The index to read.
   * @return {number}
   * @private
   */
  read16F_(bytes, i=0) {
    return unpack(bytes, i, 5, 11);
  }

  /**
   * Read 1 32-bit float from bytes.
   * @param {!Uint8Array|!Array<number>} bytes An array of bytes.
   * @param {number=} i The index to read.
   * @return {number}
   * @private
   */
  read32F_(bytes, i=0) {
    return unpack(bytes, i, 8, 23);
  }

  /**
 * Read 1 32-bit float from bytes using a TypedArray.
 * @param {!Uint8Array|!Array<number>} bytes An array of bytes.
 * @param {number=} i The index to read.
 * @return {number}
 * @private
 */
  read32FTyped_(bytes, i=0) {
    this.ui32_[0] = super.read(bytes, i);
    return this.f32_[0];
  }

  /**
   * Read 1 64-bit float from bytes.
   * @param {!Uint8Array|!Array<number>} bytes An array of bytes.
   * @param {number=} i The index to read.
   * @return {number}
   * @private
   */
  read64F_(bytes, i=0) {
    return unpack(bytes, i, 11, 52);
  }

  /**
   * Read 1 64-bit float from bytes using a TypedArray.
   * Thanks https://gist.github.com/kg/2192799
   * @param {!Uint8Array|!Array<number>} bytes An array of bytes.
   * @param {number=} i The index to read.
   * @return {number}
   * @private
   */
  read64FTyped_(bytes, i=0) {
    this.ui32_[this.HIGH_] = super.read(bytes, i);
    this.ui32_[this.LOW_] = super.read(bytes, i + 4);
    return this.f64_[0];
  }

  /**
   * Write one 16-bit float as a binary value.
   * @param {!Uint8Array|!Array<number>} bytes An array of bytes.
   * @param {number} number The number to write as bytes.
   * @param {number=} j The index being written in the byte buffer.
   * @return {number} The next index to write on the byte buffer.
   * @private
   */
  write16F_(bytes, number, j=0) {
    return pack(bytes, j, number, 5, 11);
  }

  /**
   * Write one 32-bit float as a binary value.
   * @param {!Uint8Array|!Array<number>} bytes An array of bytes.
   * @param {number} number The number to write as bytes.
   * @param {number=} j The index being written in the byte buffer.
   * @return {number} The next index to write on the byte buffer.
   * @private
   */
  write32F_(bytes, number, j=0) {
    return pack(bytes, j, number, 8, 23);
  }

  /**
   * Write one 32-bit float as a binary value using a TypedArray.
   * @param {!Uint8Array|!Array<number>} bytes An array of bytes.
   * @param {number} number The number to write as bytes.
   * @param {number=} j The index being written in the byte buffer.
   * @return {number} The next index to write on the byte buffer.
   * @private
   */
  write32FTyped_(bytes, number, j=0) {
    if (number !== number) {
      return this.write32F_(bytes, number, j);
    }
    this.f32_[0] = number;
    return super.write(bytes, this.ui32_[0], j);
  }

  /**
   * Write one 64-bit float as a binary value.
   * @param {!Uint8Array|!Array<number>} bytes An array of bytes.
   * @param {number} number The number to write as bytes.
   * @param {number=} j The index being written in the byte buffer.
   * @return {number} The next index to write on the byte buffer.
   * @private
   */
  write64F_(bytes, number, j=0) {
    return pack(bytes, j, number, 11, 52);
  }

  /**
   * Write one 64-bit float as a binary value using a TypedArray.
   * @param {!Uint8Array|!Array<number>} bytes An array of bytes.
   * @param {number} number The number to write as bytes.
   * @param {number=} j The index being written in the byte buffer.
   * @return {number} The next index to write on the byte buffer.
   * @private
   */
  write64FTyped_(bytes, number, j=0) {
    if (number !== number) {
      return this.write64F_(bytes, number, j);
    }
    this.f64_[0] = number;
    j = super.write(bytes, this.ui32_[this.HIGH_], j);
    return super.write(bytes, this.ui32_[this.LOW_], j);
  }

  /**
   * Set the functions to pack and unpack numbers.
   * @param {!Object} theType The type definition.
   * @private
   */
  setReaderAndWriter_(theType) {
    if (theType.float) {
      if (theType.bits == 16) {
        this.read = this.read16F_;
        this.write = this.write16F_;
      } else if(theType.bits == 32) {
        this.read = this.TYPED ? this.read32FTyped_ : this.read32F_;
        this.write = this.TYPED ? this.write32FTyped_ : this.write32F_;
      } else {
        this.read = this.TYPED ? this.read64FTyped_: this.read64F_;
        this.write = this.TYPED ? this.write64FTyped_ : this.write64F_;
      }
    } else {
      this.read = super.read;
      this.write = super.write;
    }
  }
}


1			/*
2			* Copyright (c) 2017-2018 Rafael da Silva Rocha.
3			*
4			* Permission is hereby granted, free of charge, to any person obtaining
5			* a copy of this software and associated documentation files (the
6			* "Software"), to deal in the Software without restriction, including
7			* without limitation the rights to use, copy, modify, merge, publish,
8			* distribute, sublicense, and/or sell copies of the Software, and to
9			* permit persons to whom the Software is furnished to do so, subject to
10			* the following conditions:
11			*
12			* The above copyright notice and this permission notice shall be
13			* included in all copies or substantial portions of the Software.
14			*
15			* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
16			* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
17			* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
18			* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
19			* LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
20			* OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
21			* WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
22			*
23			*/
24
25			/**
26			* @fileoverview Function to serialize binary data.
27			* @see https://github.com/rochars/byte-data
28			*/
29
30			import Integer from './integer.js';
31			import {validateType} from './validation.js';
32			import {unpack, pack} from './IEEE754.js';
33
34			/**
35			* A class to pack and unpack integers and floating-point numbers.
36			* @extends {Integer}
37			*/
38			export default class Packer extends Integer {
39
40			constructor() {
41			super();
42			/**
43			* If TypedArrays are available or not
44			* @type {boolean}
45			*/
46			this.TYPED = typeof Uint8Array === 'function';
47			/**
48			* Use a Typed Array to check if the host is BE or LE. This will impact
49			* on how 64-bit floating point numbers are handled.
50			* @type {boolean}
51			*/
52			let BE_ENV = false;
53			if (this.TYPED) {
54			BE_ENV = new Uint8Array(new Uint32Array([1]).buffer)[0] === 0;
55			}
56			/**
57			* @type {number}
58			* @private
59			*/
60			this.HIGH_ = BE_ENV ? 1 : 0;
61			/**
62			* @type {number}
63			* @private
64			*/
65			this.LOW_ = BE_ENV ? 0 : 1;
66			/**
67			* @type {!Uint8Array\|null}
68			*/
69			let uInt8 = this.TYPED ? new Uint8Array(8) : null;
70			/**
71			* @type {!Uint32Array\|null}
72			* @private
73			*/
74			this.ui32_ = this.TYPED ? new Uint32Array(uInt8.buffer) : null;
75			/**
76			* @type {!Float32Array\|null}
77			* @private
78			*/
79			this.f32_ = this.TYPED ? new Float32Array(uInt8.buffer) : null;
80			/**
81			* @type {!Float64Array\|null}
82			* @private
83			*/
84			this.f64_ = this.TYPED ? new Float64Array(uInt8.buffer) : null;
85			}
86
87			/**
88			* Set up the object to start serializing/deserializing a data type..
89			* @param {!Object} theType The type definition.
90			* @throws {Error} If the type definition is not valid.
91			*/
92			setUp(theType) {
93			validateType(theType);
94			super.setUp({
95			bits: theType.bits,
96			signed: theType.float ? false : theType.signed});
97			this.setReaderAndWriter_(theType);
98			}
99
100			/**
101			* Read 1 16-bit float from bytes.
102			* @see https://stackoverflow.com/a/8796597
103			* @param {!Uint8Array\|!Array<number>} bytes An array of bytes.
104			* @param {number=} i The index to read.
105			* @return {number}
106			* @private
107			*/
108			read16F_(bytes, i=0) {
109			return unpack(bytes, i, 5, 11);
110			}
111
112			/**
113			* Read 1 32-bit float from bytes.
114			* @param {!Uint8Array\|!Array<number>} bytes An array of bytes.
115			* @param {number=} i The index to read.
116			* @return {number}
117			* @private
118			*/
119			read32F_(bytes, i=0) {
120			return unpack(bytes, i, 8, 23);
121			}
122
123			/**
124			* Read 1 32-bit float from bytes using a TypedArray.
125			* @param {!Uint8Array\|!Array<number>} bytes An array of bytes.
126			* @param {number=} i The index to read.
127			* @return {number}
128			* @private
129			*/
130			read32FTyped_(bytes, i=0) {
131			this.ui32_[0] = super.read(bytes, i);
132			return this.f32_[0];
133			}
134
135			/**
136			* Read 1 64-bit float from bytes.
137			* @param {!Uint8Array\|!Array<number>} bytes An array of bytes.
138			* @param {number=} i The index to read.
139			* @return {number}
140			* @private
141			*/
142			read64F_(bytes, i=0) {
143			return unpack(bytes, i, 11, 52);
144			}
145
146			/**
147			* Read 1 64-bit float from bytes using a TypedArray.
148			* Thanks https://gist.github.com/kg/2192799
149			* @param {!Uint8Array\|!Array<number>} bytes An array of bytes.
150			* @param {number=} i The index to read.
151			* @return {number}
152			* @private
153			*/
154			read64FTyped_(bytes, i=0) {
155			this.ui32_[this.HIGH_] = super.read(bytes, i);
156			this.ui32_[this.LOW_] = super.read(bytes, i + 4);
157			return this.f64_[0];
158			}
159
160			/**
161			* Write one 16-bit float as a binary value.
162			* @param {!Uint8Array\|!Array<number>} bytes An array of bytes.
163			* @param {number} number The number to write as bytes.
164			* @param {number=} j The index being written in the byte buffer.
165			* @return {number} The next index to write on the byte buffer.
166			* @private
167			*/
168			write16F_(bytes, number, j=0) {
169			return pack(bytes, j, number, 5, 11);
170			}
171
172			/**
173			* Write one 32-bit float as a binary value.
174			* @param {!Uint8Array\|!Array<number>} bytes An array of bytes.
175			* @param {number} number The number to write as bytes.
176			* @param {number=} j The index being written in the byte buffer.
177			* @return {number} The next index to write on the byte buffer.
178			* @private
179			*/
180			write32F_(bytes, number, j=0) {
181			return pack(bytes, j, number, 8, 23);
182			}
183
184			/**
185			* Write one 32-bit float as a binary value using a TypedArray.
186			* @param {!Uint8Array\|!Array<number>} bytes An array of bytes.
187			* @param {number} number The number to write as bytes.
188			* @param {number=} j The index being written in the byte buffer.
189			* @return {number} The next index to write on the byte buffer.
190			* @private
191			*/
192			write32FTyped_(bytes, number, j=0) {
193			if (number !== number) {
194			return this.write32F_(bytes, number, j);
195			}
196			this.f32_[0] = number;
197			return super.write(bytes, this.ui32_[0], j);
198			}
199
200			/**
201			* Write one 64-bit float as a binary value.
202			* @param {!Uint8Array\|!Array<number>} bytes An array of bytes.
203			* @param {number} number The number to write as bytes.
204			* @param {number=} j The index being written in the byte buffer.
205			* @return {number} The next index to write on the byte buffer.
206			* @private
207			*/
208			write64F_(bytes, number, j=0) {
209			return pack(bytes, j, number, 11, 52);
210			}
211
212			/**
213			* Write one 64-bit float as a binary value using a TypedArray.
214			* @param {!Uint8Array\|!Array<number>} bytes An array of bytes.
215			* @param {number} number The number to write as bytes.
216			* @param {number=} j The index being written in the byte buffer.
217			* @return {number} The next index to write on the byte buffer.
218			* @private
219			*/
220			write64FTyped_(bytes, number, j=0) {
221			if (number !== number) {
222			return this.write64F_(bytes, number, j);
223			}
224			this.f64_[0] = number;
225			j = super.write(bytes, this.ui32_[this.HIGH_], j);
226			return super.write(bytes, this.ui32_[this.LOW_], j);
227			}
228
229			/**
230			* Set the functions to pack and unpack numbers.
231			* @param {!Object} theType The type definition.
232			* @private
233			*/
234			setReaderAndWriter_(theType) {
235			if (theType.float) {
236			if (theType.bits == 16) {
237			this.read = this.read16F_;
238			this.write = this.write16F_;
239			} else if(theType.bits == 32) {
240			this.read = this.TYPED ? this.read32FTyped_ : this.read32F_;
241			this.write = this.TYPED ? this.write32FTyped_ : this.write32F_;
242			} else {
243			this.read = this.TYPED ? this.read64FTyped_: this.read64F_;
244			this.write = this.TYPED ? this.write64FTyped_ : this.write64F_;
245			}
246			} else {
247			this.read = super.read;
248			this.write = super.write;
249			}
250			}
251			}
252

rochars / byte-data

Push — master ( 2f7ce0...4f126f )

packer.js ➔ write32FTyped_ A

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