index.js ➔ unpackArrayTo - Code Metrics - Inspection of "Add ADPCM chirp test" - rochars/wavefile - Measure and Improve Code Quality continuously with Scrutinizer

Passed

Branch — v11-no-dependencies (fcadbf)

by Rafael S.

created 2020-01-30 02:01 UTC

index.js ➔ unpackArrayTo A

↳ Parent: lib/parsers/binary/index.js

Complexity

Conditions

Size

Total Lines	20
Code Lines	12

Duplication

Lines	0
Ratio	0 %

Importance

Changes

Metric	Value
cc	3
eloc	12
dl	0
loc	20
rs	9.8
c	0
b	0
f	0

/*
 * Copyright (c) 2017-2019 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 JavaScript binary parser for any browser or environment.
 * @see https://github.com/rochars/byte-data
 */

/** @module byte-data */

import { endianness } from './lib/endianness';
import { pack as packUTF8, unpack as unpackUTF8 } from './lib/utf8-parser';
import { IntParser } from './lib/int-parser';
import { FloatParser } from './lib/float-parser';

/**
 * Read a string of UTF-8 characters from a byte buffer.
 * @param {!(Uint8Array|Array<number>)} buffer A byte buffer.
 * @param {number} [index=0] The buffer index to start reading.
 * @param {number} [end=buffer.length] The index to stop reading, non inclusive.
 * @return {string}
 */
export function unpackString(buffer, index=0, end=buffer.length) {
  return unpackUTF8(buffer, index, end);
}

/**
 * Write a string of UTF-8 characters as a byte buffer.
 * @param {string} str The string to pack.
 * @return {!Array<number>} The UTF-8 string bytes.
 * @throws {TypeError} If 'str' is not a string.
 */
export function packString(str) {
  /** @type {!Array<number>} */
  let buffer = [];
  packUTF8(str, buffer);
  return buffer;
}

/**
 * Write a string of UTF-8 characters to a byte buffer.
 * @param {string} str The string to pack.
 * @param {!(Uint8Array|Array<number>)} buffer The output buffer.
 * @param {number} [index=0] The buffer index to start writing.
 * @return {number} The next index to write in the buffer.
 * @throws {TypeError} If 'str' is not a string.
 */
export function packStringTo(str, buffer, index=0) {
  return packUTF8(str, buffer, index);
}

// Numbers
/**
 * Pack a array of numbers to a byte buffer.
 * All other packing functions are interfaces to this function.
 * @param {!(Array<number>|TypedArray)} values The values to pack.
 * @param {!{bits:number,
 *   fp: (boolean|undefined),
 *   signed: (boolean|undefined),
 *   be: (boolean|undefined)}} theType The type definition.
 * @param {!(Uint8Array|Array<number>)} buffer The buffer to write on.
 * @param {number} [index=0] The buffer index to start writing.
 * @return {number} The next index to write.
 * @throws {Error} If the type definition is not valid.
 * @throws {RangeError} On overflow if clamp is set to false.
 * @throws {TypeError} If 'values' is not a array of numbers.
 */
export function packArrayTo(values, theType, buffer, index=0) {
  theType = theType || {};
  /** @type {!Object} */
  let packer = getParser_(theType.bits, theType.fp, theType.signed);
  /** @type {number} */
  let offset = Math.ceil(theType.bits / 8);
  /** @type {number} */
  let i = 0;
  /** @type {number} */
  let start = index;
  for (let valuesLen = values.length; i < valuesLen; i++) {
    index = packer.pack(buffer, values[i], index);
  }
  if (theType.be) {
    endianness(buffer, offset, start, index);
  }
  return index;
}

/**
 * Unpack a array of numbers from a byte buffer to a array or a typed array.
 * All other unpacking functions are interfaces to this function.
 * @param {!(Uint8Array|Array<number>)} buffer The byte buffer.
 * @param {!{bits:number,
 *   fp: (boolean|undefined),
 *   signed: (boolean|undefined),
 *   be: (boolean|undefined)}} theType The type definition.
 * @param {!(TypedArray|Array<number>)} output The output array or typed array.
 * @param {number} [start=0] The buffer index to start reading.
 * @param {number} [end=buffer.length] The buffer index to stop reading.
 * @throws {Error} If the type definition is not valid.
 */
export function unpackArrayTo(
    buffer, theType, output, start=0, end=buffer.length) {
  theType = theType || {};
  /** @type {!Object} */
  let parser = getParser_(theType.bits, theType.fp, theType.signed);
  // getUnpackLen_ will adjust the end index according to the size
  // of the input buffer and the byte offset or throw a error on bad
  // end index if safe=true
  end = getUnpackLen_(buffer, start, end, parser.offset);
  if (theType.be) {
    /** @type {!(Uint8Array|Array<number>)} */
    let readBuffer = copyBuffer_(buffer);
    if (theType.be) {
      endianness(readBuffer, parser.offset, start, end);
    }
    unpack_(readBuffer, output, start, end, parser);
  } else {
    unpack_(buffer, output, start, end, parser);
  }
}

/**
 * Pack a number to a byte buffer.
 * @param {number} value The value.
 * @param {!{bits:number,
 *   fp: (boolean|undefined),
 *   signed: (boolean|undefined),
 *   be: (boolean|undefined)}} theType The type definition.
 * @param {!(Uint8Array|Array<number>)} buffer The byte buffer to write on.
 * @param {number} [index=0] The buffer index to write.
 * @return {number} The next index to write.
 * @throws {Error} If the type definition is not valid.
 * @throws {RangeError} On overflow if clamp is set to false.
 * @throws {TypeError} If 'value' is not a number.
 * @throws {TypeError} If 'value' is not a int and type is int.
 */
export function packTo(value, theType, buffer, index=0) {
  return packArrayTo([value], theType, buffer, index);
}

/**
 * Pack a number as a array of bytes.
 * @param {number} value The number to pack.
 * @param {!{bits:number,
 *   fp: (boolean|undefined),
 *   signed: (boolean|undefined),
 *   be: (boolean|undefined)}} theType The type definition.
 * @return {!Array<number>} The packed value.
 * @throws {Error} If the type definition is not valid.
 * @throws {TypeError} If 'value' is not a number.
 */
export function pack(value, theType) {
  /** @type {!Array<number>} */
  let output = [];
  packTo(value, theType, output, 0);
  return output;
}

/**
 * Unpack a number from a byte buffer.
 * @param {!(Uint8Array|Array<number>)} buffer The byte buffer.
 * @param {!{bits:number,
 *   fp: (boolean|undefined),
 *   signed: (boolean|undefined),
 *   be: (boolean|undefined)}} theType The type definition.
 * @param {number} [index=0] The buffer index to read.
 * @return {number}
 * @throws {Error} If the type definition is not valid.
 * @throws {Error} On bad input buffer length if on safe mode.
 */
export function unpack(buffer, theType, index=0) {
  let output = [];
  unpackArrayTo(buffer, theType, output,
    index, index + Math.ceil(theType.bits / 8));
  return output[0];
}

/**
 * Unpack a array of numbers from a byte buffer to a array or a typed array.
 * @param {!(Uint8Array|Array<number>)} buffer The byte buffer.
 * @param {!(TypedArray|Array<number>)} output The output array or typed array.
 * @param {number} start The buffer index to start reading.
 * @param {number} end The buffer index to stop reading.
 * @param {!Object} parser The parser.
 * @throws {Error} If the type definition is not valid.
 * @private
 */
function unpack_(buffer, output, start, end, parser) {
  /** @type {number} */
  let offset = parser.offset;
  for (let index = 0, j = start; j < end; j += offset, index++) {
    output[index] = parser.unpack(buffer, j);
  }
}

/**
 * Copy a byte buffer as a Array or Uint8Array.
 * @param {!(Uint8Array|Array<number>)} buffer The byte buffer.
 * @return {!(Uint8Array|Array<number>)}
 * @private
 */
function copyBuffer_(buffer) {
  return new Uint8Array(buffer);
}

/**
 * Adjust the end index according to the input buffer length and the
 * type offset.
 * @param {!(Uint8Array|Array<number>)} buffer The byte buffer.
 * @param {number} start The buffer index to start reading.
 * @param {number} end The buffer index to stop reading.
 * @param {number} offset The number of bytes used by the type.
 * @throws {Error} On bad buffer length, if safe.
 * @private
 */
function getUnpackLen_(buffer, start, end, offset) {
  /** @type {number} */
  let extra = (end - start) % offset;
  return end - extra;
}

/**
 * Return a parser for int, uint or fp numbers.
 * @param {number} bits The number of bits.
 * @param {boolean|undefined} fp True for fp numbers, false otherwise.
 * @param {boolean|undefined} signed True for signed ints, false otherwise.
 * @return {!Object}
 * @private
 */
function getParser_(bits, fp, signed) {
  if (fp && bits == 32) {
    return new FloatParser(8, 23);
  } else if(fp && bits == 64) {
    return new FloatParser(11, 52);
  }
  return new IntParser(bits, signed);
}


1			/*
2			* Copyright (c) 2017-2019 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 JavaScript binary parser for any browser or environment.
27			* @see https://github.com/rochars/byte-data
28			*/
29
30			/** @module byte-data */
31
32			import { endianness } from './lib/endianness';
33			import { pack as packUTF8, unpack as unpackUTF8 } from './lib/utf8-parser';
34			import { IntParser } from './lib/int-parser';
35			import { FloatParser } from './lib/float-parser';
36
37			/**
38			* Read a string of UTF-8 characters from a byte buffer.
39			* @param {!(Uint8Array\|Array<number>)} buffer A byte buffer.
40			* @param {number} [index=0] The buffer index to start reading.
41			* @param {number} [end=buffer.length] The index to stop reading, non inclusive.
42			* @return {string}
43			*/
44			export function unpackString(buffer, index=0, end=buffer.length) {
45			return unpackUTF8(buffer, index, end);
46			}
47
48			/**
49			* Write a string of UTF-8 characters as a byte buffer.
50			* @param {string} str The string to pack.
51			* @return {!Array<number>} The UTF-8 string bytes.
52			* @throws {TypeError} If 'str' is not a string.
53			*/
54			export function packString(str) {
55			/** @type {!Array<number>} */
56			let buffer = [];
57			packUTF8(str, buffer);
58			return buffer;
59			}
60
61			/**
62			* Write a string of UTF-8 characters to a byte buffer.
63			* @param {string} str The string to pack.
64			* @param {!(Uint8Array\|Array<number>)} buffer The output buffer.
65			* @param {number} [index=0] The buffer index to start writing.
66			* @return {number} The next index to write in the buffer.
67			* @throws {TypeError} If 'str' is not a string.
68			*/
69			export function packStringTo(str, buffer, index=0) {
70			return packUTF8(str, buffer, index);
71			}
72
73			// Numbers
74			/**
75			* Pack a array of numbers to a byte buffer.
76			* All other packing functions are interfaces to this function.
77			* @param {!(Array<number>\|TypedArray)} values The values to pack.
78			* @param {!{bits:number,
79			* fp: (boolean\|undefined),
80			* signed: (boolean\|undefined),
81			* be: (boolean\|undefined)}} theType The type definition.
82			* @param {!(Uint8Array\|Array<number>)} buffer The buffer to write on.
83			* @param {number} [index=0] The buffer index to start writing.
84			* @return {number} The next index to write.
85			* @throws {Error} If the type definition is not valid.
86			* @throws {RangeError} On overflow if clamp is set to false.
87			* @throws {TypeError} If 'values' is not a array of numbers.
88			*/
89			export function packArrayTo(values, theType, buffer, index=0) {
90			theType = theType \|\| {};
91			/** @type {!Object} */
92			let packer = getParser_(theType.bits, theType.fp, theType.signed);
93			/** @type {number} */
94			let offset = Math.ceil(theType.bits / 8);
95			/** @type {number} */
96			let i = 0;
97			/** @type {number} */
98			let start = index;
99			for (let valuesLen = values.length; i < valuesLen; i++) {
100			index = packer.pack(buffer, values[i], index);
101			}
102			if (theType.be) {
103			endianness(buffer, offset, start, index);
104			}
105			return index;
106			}
107
108			/**
109			* Unpack a array of numbers from a byte buffer to a array or a typed array.
110			* All other unpacking functions are interfaces to this function.
111			* @param {!(Uint8Array\|Array<number>)} buffer The byte buffer.
112			* @param {!{bits:number,
113			* fp: (boolean\|undefined),
114			* signed: (boolean\|undefined),
115			* be: (boolean\|undefined)}} theType The type definition.
116			* @param {!(TypedArray\|Array<number>)} output The output array or typed array.
117			* @param {number} [start=0] The buffer index to start reading.
118			* @param {number} [end=buffer.length] The buffer index to stop reading.
119			* @throws {Error} If the type definition is not valid.
120			*/
121			export function unpackArrayTo(
122			buffer, theType, output, start=0, end=buffer.length) {
123			theType = theType \|\| {};
124			/** @type {!Object} */
125			let parser = getParser_(theType.bits, theType.fp, theType.signed);
126			// getUnpackLen_ will adjust the end index according to the size
127			// of the input buffer and the byte offset or throw a error on bad
128			// end index if safe=true
129			end = getUnpackLen_(buffer, start, end, parser.offset);
130			if (theType.be) {
131			/** @type {!(Uint8Array\|Array<number>)} */
132			let readBuffer = copyBuffer_(buffer);
133			if (theType.be) {
134			endianness(readBuffer, parser.offset, start, end);
135			}
136			unpack_(readBuffer, output, start, end, parser);
137			} else {
138			unpack_(buffer, output, start, end, parser);
139			}
140			}
141
142			/**
143			* Pack a number to a byte buffer.
144			* @param {number} value The value.
145			* @param {!{bits:number,
146			* fp: (boolean\|undefined),
147			* signed: (boolean\|undefined),
148			* be: (boolean\|undefined)}} theType The type definition.
149			* @param {!(Uint8Array\|Array<number>)} buffer The byte buffer to write on.
150			* @param {number} [index=0] The buffer index to write.
151			* @return {number} The next index to write.
152			* @throws {Error} If the type definition is not valid.
153			* @throws {RangeError} On overflow if clamp is set to false.
154			* @throws {TypeError} If 'value' is not a number.
155			* @throws {TypeError} If 'value' is not a int and type is int.
156			*/
157			export function packTo(value, theType, buffer, index=0) {
158			return packArrayTo([value], theType, buffer, index);
159			}
160
161			/**
162			* Pack a number as a array of bytes.
163			* @param {number} value The number to pack.
164			* @param {!{bits:number,
165			* fp: (boolean\|undefined),
166			* signed: (boolean\|undefined),
167			* be: (boolean\|undefined)}} theType The type definition.
168			* @return {!Array<number>} The packed value.
169			* @throws {Error} If the type definition is not valid.
170			* @throws {TypeError} If 'value' is not a number.
171			*/
172			export function pack(value, theType) {
173			/** @type {!Array<number>} */
174			let output = [];
175			packTo(value, theType, output, 0);
176			return output;
177			}
178
179			/**
180			* Unpack a number from a byte buffer.
181			* @param {!(Uint8Array\|Array<number>)} buffer The byte buffer.
182			* @param {!{bits:number,
183			* fp: (boolean\|undefined),
184			* signed: (boolean\|undefined),
185			* be: (boolean\|undefined)}} theType The type definition.
186			* @param {number} [index=0] The buffer index to read.
187			* @return {number}
188			* @throws {Error} If the type definition is not valid.
189			* @throws {Error} On bad input buffer length if on safe mode.
190			*/
191			export function unpack(buffer, theType, index=0) {
192			let output = [];
193			unpackArrayTo(buffer, theType, output,
194			index, index + Math.ceil(theType.bits / 8));
195			return output[0];
196			}
197
198			/**
199			* Unpack a array of numbers from a byte buffer to a array or a typed array.
200			* @param {!(Uint8Array\|Array<number>)} buffer The byte buffer.
201			* @param {!(TypedArray\|Array<number>)} output The output array or typed array.
202			* @param {number} start The buffer index to start reading.
203			* @param {number} end The buffer index to stop reading.
204			* @param {!Object} parser The parser.
205			* @throws {Error} If the type definition is not valid.
206			* @private
207			*/
208			function unpack_(buffer, output, start, end, parser) {
209			/** @type {number} */
210			let offset = parser.offset;
211			for (let index = 0, j = start; j < end; j += offset, index++) {
212			output[index] = parser.unpack(buffer, j);
213			}
214			}
215
216			/**
217			* Copy a byte buffer as a Array or Uint8Array.
218			* @param {!(Uint8Array\|Array<number>)} buffer The byte buffer.
219			* @return {!(Uint8Array\|Array<number>)}
220			* @private
221			*/
222			function copyBuffer_(buffer) {
223			return new Uint8Array(buffer);
224			}
225
226			/**
227			* Adjust the end index according to the input buffer length and the
228			* type offset.
229			* @param {!(Uint8Array\|Array<number>)} buffer The byte buffer.
230			* @param {number} start The buffer index to start reading.
231			* @param {number} end The buffer index to stop reading.
232			* @param {number} offset The number of bytes used by the type.
233			* @throws {Error} On bad buffer length, if safe.
234			* @private
235			*/
236			function getUnpackLen_(buffer, start, end, offset) {
237			/** @type {number} */
238			let extra = (end - start) % offset;
239			return end - extra;
240			}
241
242			/**
243			* Return a parser for int, uint or fp numbers.
244			* @param {number} bits The number of bits.
245			* @param {boolean\|undefined} fp True for fp numbers, false otherwise.
246			* @param {boolean\|undefined} signed True for signed ints, false otherwise.
247			* @return {!Object}
248			* @private
249			*/
250			function getParser_(bits, fp, signed) {
251			if (fp && bits == 32) {
252			return new FloatParser(8, 23);
253			} else if(fp && bits == 64) {
254			return new FloatParser(11, 52);
255			}
256			return new IntParser(bits, signed);
257			}
258

rochars / wavefile

Branch — v11-no-dependencies (fcadbf)

index.js ➔ unpackArrayTo A

Complexity

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Duplication

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