packer.js ➔ setUp - Code Metrics - Inspection of "Encode and decode floats without Typed Arrays" - rochars/byte-data - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Branch — v15.x (14761d)

by Rafael S.

created 2018-07-25 03:38 UTC

packer.js ➔ setUp A

↳ Parent: lib/packer.js

Complexity

Conditions	2
Paths	2

Size

Total Lines	7
Code Lines	6

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	2
eloc	6
nc	2
nop	1
dl	0
loc	7
rs	10
c	0
b	0
f	0

/*
 * 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 as unpackIEEE754, pack as packIEEE754} from './IEEE754.js';

/**
 * A class to pack and unpack integers and floating-point numbers.
 * @extends {Integer}
 */
export default class Packer extends Integer {
  /**
   * 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 unpackIEEE754(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 unpackIEEE754(bytes, i, 8, 23);
  }

  /**
   * Read 1 64-bit float from bytes.
   * 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
   */
  read64F_(bytes, i=0) {
    return unpackIEEE754(bytes, i, 11, 52);
  }

  /**
   * 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 packIEEE754(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 packIEEE754(bytes, j, number, 8, 23);
  }

  /**
   * 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 packIEEE754(bytes, j, number, 11, 52);
  }

  /**
   * 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.read32F_;
        this.write = this.write32F_;
      } else {
        this.read = this.read64F_;
        this.write = 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 as unpackIEEE754, pack as packIEEE754} 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			* Set up the object to start serializing/deserializing a data type..
41			* @param {!Object} theType The type definition.
42			* @throws {Error} If the type definition is not valid.
43			*/
44			setUp(theType) {
45			validateType(theType);
46			super.setUp({
47			bits: theType.bits,
48			signed: theType.float ? false : theType.signed});
49			this.setReaderAndWriter_(theType);
50			}
51
52			/**
53			* Read 1 16-bit float from bytes.
54			* @see https://stackoverflow.com/a/8796597
55			* @param {!Uint8Array\|!Array<number>} bytes An array of bytes.
56			* @param {number=} i The index to read.
57			* @return {number}
58			* @private
59			*/
60			read16F_(bytes, i=0) {
61			return unpackIEEE754(bytes, i, 5, 11);
62			}
63
64			/**
65			* Read 1 32-bit float from bytes.
66			* @param {!Uint8Array\|!Array<number>} bytes An array of bytes.
67			* @param {number=} i The index to read.
68			* @return {number}
69			* @private
70			*/
71			read32F_(bytes, i=0) {
72			return unpackIEEE754(bytes, i, 8, 23);
73			}
74
75			/**
76			* Read 1 64-bit float from bytes.
77			* Thanks https://gist.github.com/kg/2192799
78			* @param {!Uint8Array\|!Array<number>} bytes An array of bytes.
79			* @param {number=} i The index to read.
80			* @return {number}
81			* @private
82			*/
83			read64F_(bytes, i=0) {
84			return unpackIEEE754(bytes, i, 11, 52);
85			}
86
87			/**
88			* Write one 16-bit float as a binary value.
89			* @param {!Uint8Array\|!Array<number>} bytes An array of bytes.
90			* @param {number} number The number to write as bytes.
91			* @param {number=} j The index being written in the byte buffer.
92			* @return {number} The next index to write on the byte buffer.
93			* @private
94			*/
95			write16F_(bytes, number, j=0) {
96			return packIEEE754(bytes, j, number, 5, 11);
97			}
98
99			/**
100			* Write one 32-bit float as a binary value.
101			* @param {!Uint8Array\|!Array<number>} bytes An array of bytes.
102			* @param {number} number The number to write as bytes.
103			* @param {number=} j The index being written in the byte buffer.
104			* @return {number} The next index to write on the byte buffer.
105			* @private
106			*/
107			write32F_(bytes, number, j=0) {
108			return packIEEE754(bytes, j, number, 8, 23);
109			}
110
111			/**
112			* Write one 64-bit float as a binary value.
113			* @param {!Uint8Array\|!Array<number>} bytes An array of bytes.
114			* @param {number} number The number to write as bytes.
115			* @param {number=} j The index being written in the byte buffer.
116			* @return {number} The next index to write on the byte buffer.
117			* @private
118			*/
119			write64F_(bytes, number, j=0) {
120			return packIEEE754(bytes, j, number, 11, 52);
121			}
122
123			/**
124			* Set the functions to pack and unpack numbers.
125			* @param {!Object} theType The type definition.
126			* @private
127			*/
128			setReaderAndWriter_(theType) {
129			if (theType.float) {
130			if (theType.bits == 16) {
131			this.read = this.read16F_;
132			this.write = this.write16F_;
133			} else if(theType.bits == 32) {
134			this.read = this.read32F_;
135			this.write = this.write32F_;
136			} else {
137			this.read = this.read64F_;
138			this.write = this.write64F_;
139			}
140			} else {
141			this.read = super.read;
142			this.write = super.write;
143			}
144			}
145			}
146

rochars / byte-data

Branch — v15.x (14761d)

packer.js ➔ setUp A

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