index.js - Code Metrics - Inspection of "deprecated the Type class" - rochars/byte-data - Measure and Improve Code Quality continuously with Scrutinizer

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Push — master ( cd3c12...eac488 )

by Rafael S.

created 2018-05-04 01:12 UTC

index.js F

↳ Parent: Project

Complexity

Total Complexity	64
Complexity/F	2.29

Size

Lines of Code	671
Function Count	28

Duplication

Duplicated Lines	0
Ratio	0 %

Importance

Changes	16
Bugs	4	Features	0

Metric	Value
cc	0
wmc	64
c	16
b	4
f	0
nc	1
mnd	4
bc	67
fnc	28
dl	0
loc	671
rs	3.3549
bpm	2.3927
cpm	2.2857
noi	1

28 Functions

Rating	Name	Size	Complexity
A	➔ read64F_	5	1
A	➔ setGenericInteger_	13	4
A	➔ read32F_	4	1
B	➔ setReader_	15	6
A	➔ bytesToBase_	6	2
A	➔ toBytes_	11	3
A	➔ read16F_	12	3
A	➔ assureType_	7	2
A	➔ unpackStruct	14	3
A	➔ writeChar_	4	1
A	➔ bytesFromBase_	5	2
A	➔ pack	7	2
A	➔ formatOutput_	6	3
A	➔ packArray	4	1
A	➔ getStructDefSize_	7	2
A	➔ writeInt_	3	1
A	➔ readChar_	7	2
A	➔ unpack	10	2
A	➔ fromBytes_	9	3
A	➔ write32F_	5	1
A	➔ readInt_	3	1
A	➔ readBytes_	13	3
A	➔ packStruct	10	3
A	➔ write16F_	14	2
B	➔ setWriter_	15	6
A	➔ unpackArray	4	1
A	➔ writeBytes_	8	2
A	➔ write64F_	5	1

How to fix Complexity

/*
 * byte-data
 * Pack and unpack binary data.
 * Copyright (c) 2017-2018 Rafael da Silva Rocha.
 * https://github.com/rochars/byte-data
 *
 */

/** @private */
const endianness = require("endianness");
/** @private */
const GenericInteger = require("generic-integer");

/** @private */
let int8 = new Int8Array(4);
/** @private */
let i32 = new Int32Array(int8.buffer, 0, 1);
/** @private */
let f32 = new Float32Array(int8.buffer, 0, 1);
/** @private */
let int8f64 = new Int8Array(8);
/** @private */
let f64 = new Float64Array(int8f64.buffer);
/** @private */
let ui32 = new Uint32Array(int8f64.buffer);

/**
 * @type {Function}
 * @private
 */
let reader_;
/**
 * @type {Function}
 * @private
 */
let writer_;
/**
 * @type {Object}
 * @private
 */
let gInt_;

/**
 * Write a number or fixed-length string to a byte buffer.
 * @param {!number|!string} value The value.
 * @param {!Object} type One of the available types.
 * @param {!number} base The base of the output. Optional. Default is 10.
 *      Possible values are 2, 10 or 16.
 * @return {!Array<number|string>}
 */
function pack(value, type, base=10) {
    assureType_(type, base);
    if (value.constructor == String) {
        return toBytes_(value.slice(0, type["offset"]), type);
    }
    return toBytes_([value], type);
}

/**
 * Read a number or a fixed-length string from a byte buffer.
 * @param {!Array<number|string>|!Uint8Array} buffer An array of bytes.
 * @param {!Object} type One of the available types.
 * @param {!number} base The base of the input. Optional. Default is 10.
 *      Possible values are 2, 10 or 16.
 * @return {number|string}
 */
function unpack(buffer, type, base=10) {
    assureType_(type, base);
    let values = fromBytes_(buffer.slice(0, type["offset"]), type);
    if (type["char"]) {
        values = values.slice(0, type["offset"]);
    } else {
        values = values[0];
    }
    return values;
}

/**
 * Write an array of numbers or a string to a byte buffer.
 * @param {!Array<number>|string} values The values.
 * @param {!Object} type One of the available types.
 * @param {!number} base The base of the output. Optional. Default is 10.
 *      Possible values are 2, 10 or 16.
 * @return {!Array<number|string>}
 */
function packArray(values, type, base=10) {
    assureType_(type, base);
    return toBytes_(values, type);
}

/**
 * Read an array of numbers or a string from a byte buffer.
 * @param {!Array<number|string>|!Uint8Array} buffer The byte array.
 * @param {!Object} type One of the available types.
 * @param {!number} base The base of the input. Optional. Default is 10.
 *      Possible values are 2, 10 or 16.
 * @return {!Array<number>|string|number}
 */
function unpackArray(buffer, type, base=10) {
    assureType_(type, base);
    return fromBytes_(buffer, type);
}

/**
 * Write a struct to a byte buffer.
 * A struct is an array of values of not necessarily the same type.
 * @param {!Array<number|string>} struct The struct values.
 * @param {!Array<!Object>} def The struct type definition.
 * @param {!number} base The base of the output. Optional. Default is 10.
 *      Possible values are 2, 10 or 16.
 * @return {!Array<number|string>}
 */
function packStruct(struct, def, base=10) {
    if (struct.length < def.length) {
        return [];
    }
    let bytes = [];
    for (let i = 0; i < def.length; i++) {
        bytes = bytes.concat(pack(struct[i], def[i], base));
    }
    return bytes;
}

/**
 * Read a struct from a byte buffer.
 * A struct is an array of values of not necessarily the same type.
 * @param {!Array<number|string>|!Uint8Array} buffer The byte buffer.
 * @param {!Array<!Object>} def The struct type definition.
 * @param {!number} base The base of the input. Optional. Default is 10.
 *      Possible values are 2, 10 or 16.
 * @return {Array<number|string>}
 */
function unpackStruct(buffer, def, base=10) {
    if (buffer.length < getStructDefSize_(def)) {
        return [];
    }
    let struct = [];
    let j = 0;
    for (let i=0; i < def.length; i++) {
        struct = struct.concat(
                unpack(buffer.slice(j, j + def[i]["offset"]), def[i], base)
            );
        j += def[i]["offset"];
    }
    return struct;
}

/**
 * Read int values from bytes.
 * @param {!Array<number>|!Uint8Array} bytes An array of bytes.
 * @param {!number} i The index to read.
 * @return {!number}
 * @private
 */
function readInt_(bytes, i) {
    return gInt_.read(bytes, i);
}

/**
 * Read 1 16-bit float from bytes.
 * Thanks https://stackoverflow.com/a/8796597
 * @param {!Array<number>|!Uint8Array} bytes An array of bytes.
 * @param {!number} i The index to read.
 * @return {!number}
 * @private
 */
function read16F_(bytes, i) {
    let int = gInt_.read(bytes, i);
    let exponent = (int & 0x7C00) >> 10;
    let fraction = int & 0x03FF;
    let floatValue;
    if (exponent) {
        floatValue =  Math.pow(2, exponent - 15) * (1 + fraction / 0x400);
    } else {
        floatValue = 6.103515625e-5 * (fraction / 0x400);
    }
    return floatValue * (int >> 15 ? -1 : 1);
}

/**
 * Read 1 32-bit float from bytes.
 * @param {!Array<number>|!Uint8Array} bytes An array of bytes.
 * @param {!number} i The index to read.
 * @return {!number}
 * @private
 */
function read32F_(bytes, i) {
    i32[0] = gInt_.read(bytes, i);
    return f32[0];
}

/**
 * Read 1 64-bit double from bytes.
 * Thanks https://gist.github.com/kg/2192799
 * @param {!Array<number>|!Uint8Array} bytes An array of bytes.
 * @param {!number} i The index to read.
 * @return {!number}
 * @private
 */
function read64F_(bytes, i) {
    ui32[0] = gInt_.read(bytes, i);
    ui32[1] = gInt_.read(bytes, i + 4);
    return f64[0];
}

/**
 * Read 1 char from bytes.
 * @param {!Array<number>|!Uint8Array} bytes An array of bytes.
 * @param {!number} i The index to read.
 * @return {!string}
 * @private
 */
function readChar_(bytes, i) {
    let chrs = "";
    for(let j=0; j < gInt_.offset; j++) {
        chrs += String.fromCharCode(bytes[i+j]);
    }
    return chrs;
}

/**
 * Write a integer value to a byte buffer.
 * @param {!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
 */
function writeInt_(bytes, number, j) {
    return gInt_.write(bytes, number, j);
}

/**
 * Write one 16-bit float as a binary value.
 * @param {!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
 */
function write16F_(bytes, number, j) {
    f32[0] = number;
    let x = i32[0];
    let bits = (x >> 16) & 0x8000;
    let m = (x >> 12) & 0x07ff;
    let e = (x >> 23) & 0xff;
    if (e >= 103) {
        bits |= ((e - 112) << 10) | (m >> 1);
        bits += m & 1;
    }
    bytes[j++] = bits & 0xFF;
    bytes[j++] = bits >>> 8 & 0xFF;
    return j;
}

/**
 * Write one 32-bit float as a binary value.
 * @param {!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
 */
function write32F_(bytes, number, j) {
    f32[0] = number;
    j = gInt_.write(bytes, i32[0], j);
    return j;
}

/**
 * Write one 64-bit float as a binary value.
 * @param {!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
 */
function write64F_(bytes, number, j) {
    f64[0] = number;
    j = gInt_.write(bytes, ui32[0], j);
    return gInt_.write(bytes, ui32[1], j);
}

/**
 * Write one char as a byte.
 * @param {!Array<number>} bytes An array of bytes.
 * @param {!string} string The string 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
 */
function writeChar_(bytes, string, j) {
    bytes[j++] = string.charCodeAt(0);
    return j;
}

/**
 * Get the length in bytes of a struct definition.
 * @param {!Array<Object>} def The struct type definition.
 * @return {!number} The length of the structure in bytes.
 * @private
 */
function getStructDefSize_(def) {
    let bits = 0;
    for (let i = 0; i < def.length; i++) {
        bits += def[i]["offset"];
    }
    return bits;
}

/**
 * Turn a byte buffer into what the bytes represent.
 * @param {!Array<number|string>|!Uint8Array} buffer An array of bytes.
 * @param {!Object} type One of the available types.
 * @return {!Array<number>|number|string}
 * @private
 */
function fromBytes_(buffer, type) {
    if (type["be"]) {
        endianness(buffer, type["offset"]);
    }
    if (type["base"] != 10) {
        bytesFromBase_(buffer, type["base"]);
    }
    return readBytes_(buffer, type);
}

/**
 * Turn numbers and strings to bytes.
 * @param {!Array<!number|!string>|string} values The data.
 * @param {Object} type One of the available types.
 * @return {!Array<number|string>} the data as a byte buffer.
 * @private
 */
function toBytes_(values, type) {
    let bytes = writeBytes_(values, type);
    if (type["be"]) {
        endianness(bytes, type["offset"]);
    }
    if (type["base"] != 10) {
        bytes = bytesToBase_(bytes, type["base"]);
        formatOutput_(bytes, type);
    }
    return bytes;
}

/**
 * Read values from an array of bytes.
 * @param {!Array<!number>|!Uint8Array} bytes An array of bytes.
 * @param {!Object} type The type.
 * @return {!Array<!number>|string}
 * @private
 */
function readBytes_(bytes, type) {
    let values = [];
    let i = 0;
    let len = bytes.length - (type["offset"] - 1);
    while (i < len) {
        values.push(reader_(bytes, i));
        i += type["offset"];
    }
    if (type["char"]) {
        values = values.join("");
    }
    return values;
}

/**
 * Write values as bytes.
 * @param {!Array<number|string>|string} values The data.
 * @param {Object} type One of the available types.
 * @return {!Array<number>} the bytes.
 * @private
 */
function writeBytes_(values, type) {

    let j = 0;
    let bytes = [];
    for(let i=0; i < values.length; i++) {
        j = writer_(bytes, values[i], j);
    }
    return bytes;
}

/**
 * Fill a byte string with zeros on the left.
 * @param {!Array<!string>} bytes The bytes.
 * @param {!Object} type The type.
 * @private
 */
function formatOutput_(bytes, type) {
    let offset = (type["base"] == 2 ? 8 : 2) + 1;
    for(let i =0; i < bytes.length; i++) {
        bytes[i] = Array(offset - bytes[i].length).join("0") + bytes[i];
    }
}

/**
 * Turn bytes to base 10 from base 2 or 16.
 * @param {!Array<number>|Uint8Array} bytes The bytes as binary or hex strings.
 * @param {!number} base The base.
 * @private
 */
function bytesFromBase_(bytes, base) {
    for(let i=0; i < bytes.length; i++) {
        bytes[i] = parseInt(bytes[i], base);
    }
}

/**
 * Turn bytes from base 10 to base 2 or 16.
 * @param {!Array<string|number>} bytes The bytes.
 * @param {!number} base The base.
 * @return {!Array<!string>}
 * @private
 */
function bytesToBase_(bytes, base) {
    for(let i=0; i < bytes.length; i++) {
        bytes[i] = bytes[i].toString(base);
    }
    return bytes;
}

/**
 * @param {!Object} type The type definition.
 * @param {!number} base The base.
 * @private
 */
function assureType_(type, base) {
    type["offset"] = type["bits"] < 8 ? 1 : Math.ceil(type["bits"] / 8);
    type["base"] = base;
    setReader_(type);
    setWriter_(type);
    setGenericInteger_(type);
}

/**
 * @param {!Object} type The type definition.
 * @private
 */
function setGenericInteger_(type) {
    if (type["float"]) {
        if (type["bits"] == 64) {
            gInt_ = new GenericInteger(32, false);
        } else if(type["bits"] == 32) {
            gInt_ = new GenericInteger(32, true);
        } else {
            gInt_ = new GenericInteger(16, false);
        }
    } else {
        gInt_ = new GenericInteger(type["bits"], type["signed"]);
    }
}

/**
 * Set the function to read data of this type.
 * @param {!Object} type The type definition.
 * @private
 */
function setReader_(type) {
    if (type["float"]) {
        if (type["bits"] == 16) {
            reader_ = read16F_;
        } else if(type["bits"] == 32) {
            reader_ = read32F_;
        } else if(type["bits"] == 64) {
            reader_ = read64F_;
        }
    } else if (type["char"]) {
        reader_ = readChar_;
    } else {
        reader_ = readInt_;
    }
}

/**
 * Set the function to write data of this type.
 * @param {!Object} type The type definition.
 * @private
 */
function setWriter_(type) {
    if (type["float"]) {
        if (type["bits"] == 16) {
            writer_ = write16F_;
        } else if(type["bits"] == 32) {
            writer_ = write32F_;
        } else if(type["bits"] == 64) {
            writer_ = write64F_;
        }
    } else if (type["char"]) {
        writer_ = writeChar_;
    } else {
        writer_ = writeInt_;
    }   
}

// interface
module.exports.pack = pack;
module.exports.unpack = unpack;
module.exports.packArray = packArray;
module.exports.unpackArray = unpackArray;
module.exports.unpackStruct = unpackStruct;
module.exports.packStruct = packStruct;

/** 
 * A char.
 * @type {Object}
 */
module.exports.chr = {"bits": 8, "char": true};
/**
 * A 4-char string
 * @type {Object}
 */
module.exports.fourCC = {"bits": 32, "char": true};
/**
 * Booleans
 * @type {Object}
 */
module.exports.bool = {"bits": 1};
/**
 * Signed 2-bit integers
 * @type {Object}
 */
module.exports.int2 = {"bits": 2, "signed": true};
/**
 * Unsigned 2-bit integers
 * @type {Object}
 */
module.exports.uInt2 = {"bits": 2};
/**
 * Signed 4-bit integers
 * @type {Object}
 */
module.exports.int4 = {"bits": 4, "signed": true};
/**
 * Unsigned 4-bit integers
 * @type {Object}
 */
module.exports.uInt4 = {"bits": 4};
/**
 * Signed 8-bit integers
 * @type {Object}
 */
module.exports.int8 = {"bits": 8, "signed": true};
/**
 * Unsigned 4-bit integers
 * @type {Object}
 */
module.exports.uInt8 = {"bits": 8};
// LE
/**
 * Signed 16-bit integers little-endian
 * @type {Object}
 */
module.exports.int16  = {"bits": 16, "signed": true};
/**
 * Unsigned 16-bit integers little-endian
 * @type {Object}
 */
module.exports.uInt16 = {"bits": 16};
/**
 * Half-precision floating-point numbers little-endian
 * @type {Object}
 */
module.exports.float16 = {"bits": 16, "float": true};
/**
 * Signed 24-bit integers little-endian
 * @type {Object}
 */
module.exports.int24 = {"bits": 24, "signed": true};
/**
 * Unsigned 24-bit integers little-endian
 * @type {Object}
 */
module.exports.uInt24 = {"bits": 24};
/**
 * Signed 32-bit integers little-endian
 * @type {Object}
 */
module.exports.int32 = {"bits": 32, "signed": true};
/**
 * Unsigned 32-bit integers little-endian
 * @type {Object}
 */
module.exports.uInt32 = {"bits": 32};
/**
 * Single-precision floating-point numbers little-endian
 * @type {Object}
 */
module.exports.float32 = {"bits": 32, "float": true};
/**
 * Signed 40-bit integers little-endian
 * @type {Object}
 */
module.exports.int40 = {"bits": 40, "signed": true};
/**
 * Unsigned 40-bit integers little-endian
 * @type {Object}
 */
module.exports.uInt40 = {"bits": 40};
/**
 * Signed 48-bit integers little-endian
 * @type {Object}
 */
module.exports.int48 = {"bits": 48, "signed": true};
/**
 * Unsigned 48-bit integers little-endian
 * @type {Object}
 */
module.exports.uInt48 = {"bits": 48};
/**
 * Double-precision floating-point numbers little-endian
 * @type {Object}
 */
module.exports.float64 = {"bits": 64, "float": true};
// BE
/**
 * Signed 16-bit integers big-endian
 * @type {Object}
 */
module.exports.int16BE  = {"bits": 16, "signed": true, "be": true};
/**
 * Unsigned 16-bit integers big-endian
 * @type {Object}
 */
module.exports.uInt16BE = {"bits": 16, "be": true};
/**
 * Half-precision floating-point numbers big-endian
 * @type {Object}
 */
module.exports.float16BE = {"bits": 16, "float": true, "be": true};
/**
 * Signed 24-bit integers big-endian
 * @type {Object}
 */
module.exports.int24BE = {"bits": 24, "signed": true, "be": true};
/**
 * Unsigned 24-bit integers big-endian
 * @type {Object}
 */
module.exports.uInt24BE = {"bits": 24, "be": true};
/**
 * Signed 32-bit integers big-endian
 * @type {Object}
 */
module.exports.int32BE = {"bits": 32, "signed": true, "be": true};
/**
 * Unsigned 32-bit integers big-endian
 * @type {Object}
 */
module.exports.uInt32BE = {"bits": 32, "be": true};
/**
 * Single-precision floating-point numbers big-endian
 * @type {Object}
 */
module.exports.float32BE = {"bits": 32, "float": true, "be": true};
/**
 * Signed 40-bit integers big-endian
 * @type {Object}
 */
module.exports.int40BE = {"bits": 40, "signed": true, "be": true};
/**
 * Unsigned 40-bit integers big-endian
 * @type {Object}
 */
module.exports.uInt40BE = {"bits": 40, "be": true};
/**
 * Signed 48-bit integers big-endian
 * @type {Object}
 */
module.exports.int48BE = {"bits": 48, "signed": true, "be": true};
/**
 * Unsigned 48-bit integers big-endian
 * @type {Object}
 */
module.exports.uInt48BE = {"bits": 48, "be": true};
/**
 * Double-precision floating-point numbers big-endian
 * @type {Object}
 */
module.exports.float64BE = {"bits": 64, "float": true, "be": true};


1			/*
2			* byte-data
3			* Pack and unpack binary data.
4			* Copyright (c) 2017-2018 Rafael da Silva Rocha.
5			* https://github.com/rochars/byte-data
6			*
7			*/
8
9			/** @private */
10			const endianness = require("endianness");
11			/** @private */
12			const GenericInteger = require("generic-integer");
13
14			/** @private */
15			let int8 = new Int8Array(4);
16			/** @private */
17			let i32 = new Int32Array(int8.buffer, 0, 1);
18			/** @private */
19			let f32 = new Float32Array(int8.buffer, 0, 1);
20			/** @private */
21			let int8f64 = new Int8Array(8);
22			/** @private */
23			let f64 = new Float64Array(int8f64.buffer);
24			/** @private */
25			let ui32 = new Uint32Array(int8f64.buffer);
26
27			/**
28			* @type {Function}
29			* @private
30			*/
31			let reader_;
32			/**
33			* @type {Function}
34			* @private
35			*/
36			let writer_;
37			/**
38			* @type {Object}
39			* @private
40			*/
41			let gInt_;
42
43			/**
44			* Write a number or fixed-length string to a byte buffer.
45			* @param {!number\|!string} value The value.
46			* @param {!Object} type One of the available types.
47			* @param {!number} base The base of the output. Optional. Default is 10.
48			* Possible values are 2, 10 or 16.
49			* @return {!Array<number\|string>}
50			*/
51			function pack(value, type, base=10) {
52			assureType_(type, base);
53			if (value.constructor == String) {
54			return toBytes_(value.slice(0, type["offset"]), type);
55			}
56			return toBytes_([value], type);
57			}
58
59			/**
60			* Read a number or a fixed-length string from a byte buffer.
61			* @param {!Array<number\|string>\|!Uint8Array} buffer An array of bytes.
62			* @param {!Object} type One of the available types.
63			* @param {!number} base The base of the input. Optional. Default is 10.
64			* Possible values are 2, 10 or 16.
65			* @return {number\|string}
66			*/
67			function unpack(buffer, type, base=10) {
68			assureType_(type, base);
69			let values = fromBytes_(buffer.slice(0, type["offset"]), type);
70			if (type["char"]) {
71			values = values.slice(0, type["offset"]);
72			} else {
73			values = values[0];
74			}
75			return values;
76			}
77
78			/**
79			* Write an array of numbers or a string to a byte buffer.
80			* @param {!Array<number>\|string} values The values.
81			* @param {!Object} type One of the available types.
82			* @param {!number} base The base of the output. Optional. Default is 10.
83			* Possible values are 2, 10 or 16.
84			* @return {!Array<number\|string>}
85			*/
86			function packArray(values, type, base=10) {
87			assureType_(type, base);
88			return toBytes_(values, type);
89			}
90
91			/**
92			* Read an array of numbers or a string from a byte buffer.
93			* @param {!Array<number\|string>\|!Uint8Array} buffer The byte array.
94			* @param {!Object} type One of the available types.
95			* @param {!number} base The base of the input. Optional. Default is 10.
96			* Possible values are 2, 10 or 16.
97			* @return {!Array<number>\|string\|number}
98			*/
99			function unpackArray(buffer, type, base=10) {
100			assureType_(type, base);
101			return fromBytes_(buffer, type);
102			}
103
104			/**
105			* Write a struct to a byte buffer.
106			* A struct is an array of values of not necessarily the same type.
107			* @param {!Array<number\|string>} struct The struct values.
108			* @param {!Array<!Object>} def The struct type definition.
109			* @param {!number} base The base of the output. Optional. Default is 10.
110			* Possible values are 2, 10 or 16.
111			* @return {!Array<number\|string>}
112			*/
113			function packStruct(struct, def, base=10) {
114			if (struct.length < def.length) {
115			return [];
116			}
117			let bytes = [];
118			for (let i = 0; i < def.length; i++) {
119			bytes = bytes.concat(pack(struct[i], def[i], base));
120			}
121			return bytes;
122			}
123
124			/**
125			* Read a struct from a byte buffer.
126			* A struct is an array of values of not necessarily the same type.
127			* @param {!Array<number\|string>\|!Uint8Array} buffer The byte buffer.
128			* @param {!Array<!Object>} def The struct type definition.
129			* @param {!number} base The base of the input. Optional. Default is 10.
130			* Possible values are 2, 10 or 16.
131			* @return {Array<number\|string>}
132			*/
133			function unpackStruct(buffer, def, base=10) {
134			if (buffer.length < getStructDefSize_(def)) {
135			return [];
136			}
137			let struct = [];
138			let j = 0;
139			for (let i=0; i < def.length; i++) {
140			struct = struct.concat(
141			unpack(buffer.slice(j, j + def[i]["offset"]), def[i], base)
142			);
143			j += def[i]["offset"];
144			}
145			return struct;
146			}
147
148			/**
149			* Read int values from bytes.
150			* @param {!Array<number>\|!Uint8Array} bytes An array of bytes.
151			* @param {!number} i The index to read.
152			* @return {!number}
153			* @private
154			*/
155			function readInt_(bytes, i) {
156			return gInt_.read(bytes, i);
157			}
158
159			/**
160			* Read 1 16-bit float from bytes.
161			* Thanks https://stackoverflow.com/a/8796597
162			* @param {!Array<number>\|!Uint8Array} bytes An array of bytes.
163			* @param {!number} i The index to read.
164			* @return {!number}
165			* @private
166			*/
167			function read16F_(bytes, i) {
168			let int = gInt_.read(bytes, i);
169			let exponent = (int & 0x7C00) >> 10;
170			let fraction = int & 0x03FF;
171			let floatValue;
172			if (exponent) {
173			floatValue = Math.pow(2, exponent - 15) * (1 + fraction / 0x400);
174			} else {
175			floatValue = 6.103515625e-5 * (fraction / 0x400);
176			}
177			return floatValue * (int >> 15 ? -1 : 1);
178			}
179
180			/**
181			* Read 1 32-bit float from bytes.
182			* @param {!Array<number>\|!Uint8Array} bytes An array of bytes.
183			* @param {!number} i The index to read.
184			* @return {!number}
185			* @private
186			*/
187			function read32F_(bytes, i) {
188			i32[0] = gInt_.read(bytes, i);
189			return f32[0];
190			}
191
192			/**
193			* Read 1 64-bit double from bytes.
194			* Thanks https://gist.github.com/kg/2192799
195			* @param {!Array<number>\|!Uint8Array} bytes An array of bytes.
196			* @param {!number} i The index to read.
197			* @return {!number}
198			* @private
199			*/
200			function read64F_(bytes, i) {
201			ui32[0] = gInt_.read(bytes, i);
202			ui32[1] = gInt_.read(bytes, i + 4);
203			return f64[0];
204			}
205
206			/**
207			* Read 1 char from bytes.
208			* @param {!Array<number>\|!Uint8Array} bytes An array of bytes.
209			* @param {!number} i The index to read.
210			* @return {!string}
211			* @private
212			*/
213			function readChar_(bytes, i) {
214			let chrs = "";
215			for(let j=0; j < gInt_.offset; j++) {
216			chrs += String.fromCharCode(bytes[i+j]);
217			}
218			return chrs;
219			}
220
221			/**
222			* Write a integer value to a byte buffer.
223			* @param {!Array<number>} bytes An array of bytes.
224			* @param {!number} number The number to write as bytes.
225			* @param {!number} j The index being written in the byte buffer.
226			* @return {!number} The next index to write on the byte buffer.
227			* @private
228			*/
229			function writeInt_(bytes, number, j) {
230			return gInt_.write(bytes, number, j);
231			}
232
233			/**
234			* Write one 16-bit float as a binary value.
235			* @param {!Array<number>} bytes An array of bytes.
236			* @param {!number} number The number to write as bytes.
237			* @param {!number} j The index being written in the byte buffer.
238			* @return {!number} The next index to write on the byte buffer.
239			* @private
240			*/
241			function write16F_(bytes, number, j) {
242			f32[0] = number;
243			let x = i32[0];
244			let bits = (x >> 16) & 0x8000;
245			let m = (x >> 12) & 0x07ff;
246			let e = (x >> 23) & 0xff;
247			if (e >= 103) {
248			bits \|= ((e - 112) << 10) \| (m >> 1);
249			bits += m & 1;
250			}
251			bytes[j++] = bits & 0xFF;
252			bytes[j++] = bits >>> 8 & 0xFF;
253			return j;
254			}
255
256			/**
257			* Write one 32-bit float as a binary value.
258			* @param {!Array<number>} bytes An array of bytes.
259			* @param {!number} number The number to write as bytes.
260			* @param {!number} j The index being written in the byte buffer.
261			* @return {!number} The next index to write on the byte buffer.
262			* @private
263			*/
264			function write32F_(bytes, number, j) {
265			f32[0] = number;
266			j = gInt_.write(bytes, i32[0], j);
267			return j;
268			}
269
270			/**
271			* Write one 64-bit float as a binary value.
272			* @param {!Array<number>} bytes An array of bytes.
273			* @param {!number} number The number to write as bytes.
274			* @param {!number} j The index being written in the byte buffer.
275			* @return {!number} The next index to write on the byte buffer.
276			* @private
277			*/
278			function write64F_(bytes, number, j) {
279			f64[0] = number;
280			j = gInt_.write(bytes, ui32[0], j);
281			return gInt_.write(bytes, ui32[1], j);
282			}
283
284			/**
285			* Write one char as a byte.
286			* @param {!Array<number>} bytes An array of bytes.
287			* @param {!string} string The string to write as bytes.
288			* @param {!number} j The index being written in the byte buffer.
289			* @return {!number} The next index to write on the byte buffer.
290			* @private
291			*/
292			function writeChar_(bytes, string, j) {
293			bytes[j++] = string.charCodeAt(0);
294			return j;
295			}
296
297			/**
298			* Get the length in bytes of a struct definition.
299			* @param {!Array<Object>} def The struct type definition.
300			* @return {!number} The length of the structure in bytes.
301			* @private
302			*/
303			function getStructDefSize_(def) {
304			let bits = 0;
305			for (let i = 0; i < def.length; i++) {
306			bits += def[i]["offset"];
307			}
308			return bits;
309			}
310
311			/**
312			* Turn a byte buffer into what the bytes represent.
313			* @param {!Array<number\|string>\|!Uint8Array} buffer An array of bytes.
314			* @param {!Object} type One of the available types.
315			* @return {!Array<number>\|number\|string}
316			* @private
317			*/
318			function fromBytes_(buffer, type) {
319			if (type["be"]) {
320			endianness(buffer, type["offset"]);
321			}
322			if (type["base"] != 10) {
323			bytesFromBase_(buffer, type["base"]);
324			}
325			return readBytes_(buffer, type);
326			}
327
328			/**
329			* Turn numbers and strings to bytes.
330			* @param {!Array<!number\|!string>\|string} values The data.
331			* @param {Object} type One of the available types.
332			* @return {!Array<number\|string>} the data as a byte buffer.
333			* @private
334			*/
335			function toBytes_(values, type) {
336			let bytes = writeBytes_(values, type);
337			if (type["be"]) {
338			endianness(bytes, type["offset"]);
339			}
340			if (type["base"] != 10) {
341			bytes = bytesToBase_(bytes, type["base"]);
342			formatOutput_(bytes, type);
343			}
344			return bytes;
345			}
346
347			/**
348			* Read values from an array of bytes.
349			* @param {!Array<!number>\|!Uint8Array} bytes An array of bytes.
350			* @param {!Object} type The type.
351			* @return {!Array<!number>\|string}
352			* @private
353			*/
354			function readBytes_(bytes, type) {
355			let values = [];
356			let i = 0;
357			let len = bytes.length - (type["offset"] - 1);
358			while (i < len) {
359			values.push(reader_(bytes, i));
360			i += type["offset"];
361			}
362			if (type["char"]) {
363			values = values.join("");
364			}
365			return values;
366			}
367
368			/**
369			* Write values as bytes.
370			* @param {!Array<number\|string>\|string} values The data.
371			* @param {Object} type One of the available types.
372			* @return {!Array<number>} the bytes.
373			* @private
374			*/
375			function writeBytes_(values, type) {
			0 ignored issues – show Unused Code introduced 2018-05-04 01:14 UTC by Report Bug Copy Issue Report The parameter `type` is not used and could be removed. This check looks for parameters in functions that are not used in the function body and are not followed by other parameters which are used inside the function. Loading history...
376			let j = 0;
377			let bytes = [];
378			for(let i=0; i < values.length; i++) {
379			j = writer_(bytes, values[i], j);
380			}
381			return bytes;
382			}
383
384			/**
385			* Fill a byte string with zeros on the left.
386			* @param {!Array<!string>} bytes The bytes.
387			* @param {!Object} type The type.
388			* @private
389			*/
390			function formatOutput_(bytes, type) {
391			let offset = (type["base"] == 2 ? 8 : 2) + 1;
392			for(let i =0; i < bytes.length; i++) {
393			bytes[i] = Array(offset - bytes[i].length).join("0") + bytes[i];
394			}
395			}
396
397			/**
398			* Turn bytes to base 10 from base 2 or 16.
399			* @param {!Array<number>\|Uint8Array} bytes The bytes as binary or hex strings.
400			* @param {!number} base The base.
401			* @private
402			*/
403			function bytesFromBase_(bytes, base) {
404			for(let i=0; i < bytes.length; i++) {
405			bytes[i] = parseInt(bytes[i], base);
406			}
407			}
408
409			/**
410			* Turn bytes from base 10 to base 2 or 16.
411			* @param {!Array<string\|number>} bytes The bytes.
412			* @param {!number} base The base.
413			* @return {!Array<!string>}
414			* @private
415			*/
416			function bytesToBase_(bytes, base) {
417			for(let i=0; i < bytes.length; i++) {
418			bytes[i] = bytes[i].toString(base);
419			}
420			return bytes;
421			}
422
423			/**
424			* @param {!Object} type The type definition.
425			* @param {!number} base The base.
426			* @private
427			*/
428			function assureType_(type, base) {
429			type["offset"] = type["bits"] < 8 ? 1 : Math.ceil(type["bits"] / 8);
430			type["base"] = base;
431			setReader_(type);
432			setWriter_(type);
433			setGenericInteger_(type);
434			}
435
436			/**
437			* @param {!Object} type The type definition.
438			* @private
439			*/
440			function setGenericInteger_(type) {
441			if (type["float"]) {
442			if (type["bits"] == 64) {
443			gInt_ = new GenericInteger(32, false);
444			} else if(type["bits"] == 32) {
445			gInt_ = new GenericInteger(32, true);
446			} else {
447			gInt_ = new GenericInteger(16, false);
448			}
449			} else {
450			gInt_ = new GenericInteger(type["bits"], type["signed"]);
451			}
452			}
453
454			/**
455			* Set the function to read data of this type.
456			* @param {!Object} type The type definition.
457			* @private
458			*/
459			function setReader_(type) {
460			if (type["float"]) {
461			if (type["bits"] == 16) {
462			reader_ = read16F_;
463			} else if(type["bits"] == 32) {
464			reader_ = read32F_;
465			} else if(type["bits"] == 64) {
466			reader_ = read64F_;
467			}
468			} else if (type["char"]) {
469			reader_ = readChar_;
470			} else {
471			reader_ = readInt_;
472			}
473			}
474
475			/**
476			* Set the function to write data of this type.
477			* @param {!Object} type The type definition.
478			* @private
479			*/
480			function setWriter_(type) {
481			if (type["float"]) {
482			if (type["bits"] == 16) {
483			writer_ = write16F_;
484			} else if(type["bits"] == 32) {
485			writer_ = write32F_;
486			} else if(type["bits"] == 64) {
487			writer_ = write64F_;
488			}
489			} else if (type["char"]) {
490			writer_ = writeChar_;
491			} else {
492			writer_ = writeInt_;
493			}
494			}
495
496			// interface
497			module.exports.pack = pack;
498			module.exports.unpack = unpack;
499			module.exports.packArray = packArray;
500			module.exports.unpackArray = unpackArray;
501			module.exports.unpackStruct = unpackStruct;
502			module.exports.packStruct = packStruct;
503
504			/**
505			* A char.
506			* @type {Object}
507			*/
508			module.exports.chr = {"bits": 8, "char": true};
509			/**
510			* A 4-char string
511			* @type {Object}
512			*/
513			module.exports.fourCC = {"bits": 32, "char": true};
514			/**
515			* Booleans
516			* @type {Object}
517			*/
518			module.exports.bool = {"bits": 1};
519			/**
520			* Signed 2-bit integers
521			* @type {Object}
522			*/
523			module.exports.int2 = {"bits": 2, "signed": true};
524			/**
525			* Unsigned 2-bit integers
526			* @type {Object}
527			*/
528			module.exports.uInt2 = {"bits": 2};
529			/**
530			* Signed 4-bit integers
531			* @type {Object}
532			*/
533			module.exports.int4 = {"bits": 4, "signed": true};
534			/**
535			* Unsigned 4-bit integers
536			* @type {Object}
537			*/
538			module.exports.uInt4 = {"bits": 4};
539			/**
540			* Signed 8-bit integers
541			* @type {Object}
542			*/
543			module.exports.int8 = {"bits": 8, "signed": true};
544			/**
545			* Unsigned 4-bit integers
546			* @type {Object}
547			*/
548			module.exports.uInt8 = {"bits": 8};
549			// LE
550			/**
551			* Signed 16-bit integers little-endian
552			* @type {Object}
553			*/
554			module.exports.int16 = {"bits": 16, "signed": true};
555			/**
556			* Unsigned 16-bit integers little-endian
557			* @type {Object}
558			*/
559			module.exports.uInt16 = {"bits": 16};
560			/**
561			* Half-precision floating-point numbers little-endian
562			* @type {Object}
563			*/
564			module.exports.float16 = {"bits": 16, "float": true};
565			/**
566			* Signed 24-bit integers little-endian
567			* @type {Object}
568			*/
569			module.exports.int24 = {"bits": 24, "signed": true};
570			/**
571			* Unsigned 24-bit integers little-endian
572			* @type {Object}
573			*/
574			module.exports.uInt24 = {"bits": 24};
575			/**
576			* Signed 32-bit integers little-endian
577			* @type {Object}
578			*/
579			module.exports.int32 = {"bits": 32, "signed": true};
580			/**
581			* Unsigned 32-bit integers little-endian
582			* @type {Object}
583			*/
584			module.exports.uInt32 = {"bits": 32};
585			/**
586			* Single-precision floating-point numbers little-endian
587			* @type {Object}
588			*/
589			module.exports.float32 = {"bits": 32, "float": true};
590			/**
591			* Signed 40-bit integers little-endian
592			* @type {Object}
593			*/
594			module.exports.int40 = {"bits": 40, "signed": true};
595			/**
596			* Unsigned 40-bit integers little-endian
597			* @type {Object}
598			*/
599			module.exports.uInt40 = {"bits": 40};
600			/**
601			* Signed 48-bit integers little-endian
602			* @type {Object}
603			*/
604			module.exports.int48 = {"bits": 48, "signed": true};
605			/**
606			* Unsigned 48-bit integers little-endian
607			* @type {Object}
608			*/
609			module.exports.uInt48 = {"bits": 48};
610			/**
611			* Double-precision floating-point numbers little-endian
612			* @type {Object}
613			*/
614			module.exports.float64 = {"bits": 64, "float": true};
615			// BE
616			/**
617			* Signed 16-bit integers big-endian
618			* @type {Object}
619			*/
620			module.exports.int16BE = {"bits": 16, "signed": true, "be": true};
621			/**
622			* Unsigned 16-bit integers big-endian
623			* @type {Object}
624			*/
625			module.exports.uInt16BE = {"bits": 16, "be": true};
626			/**
627			* Half-precision floating-point numbers big-endian
628			* @type {Object}
629			*/
630			module.exports.float16BE = {"bits": 16, "float": true, "be": true};
631			/**
632			* Signed 24-bit integers big-endian
633			* @type {Object}
634			*/
635			module.exports.int24BE = {"bits": 24, "signed": true, "be": true};
636			/**
637			* Unsigned 24-bit integers big-endian
638			* @type {Object}
639			*/
640			module.exports.uInt24BE = {"bits": 24, "be": true};
641			/**
642			* Signed 32-bit integers big-endian
643			* @type {Object}
644			*/
645			module.exports.int32BE = {"bits": 32, "signed": true, "be": true};
646			/**
647			* Unsigned 32-bit integers big-endian
648			* @type {Object}
649			*/
650			module.exports.uInt32BE = {"bits": 32, "be": true};
651			/**
652			* Single-precision floating-point numbers big-endian
653			* @type {Object}
654			*/
655			module.exports.float32BE = {"bits": 32, "float": true, "be": true};
656			/**
657			* Signed 40-bit integers big-endian
658			* @type {Object}
659			*/
660			module.exports.int40BE = {"bits": 40, "signed": true, "be": true};
661			/**
662			* Unsigned 40-bit integers big-endian
663			* @type {Object}
664			*/
665			module.exports.uInt40BE = {"bits": 40, "be": true};
666			/**
667			* Signed 48-bit integers big-endian
668			* @type {Object}
669			*/
670			module.exports.int48BE = {"bits": 48, "signed": true, "be": true};
671			/**
672			* Unsigned 48-bit integers big-endian
673			* @type {Object}
674			*/
675			module.exports.uInt48BE = {"bits": 48, "be": true};
676			/**
677			* Double-precision floating-point numbers big-endian
678			* @type {Object}
679			*/
680			module.exports.float64BE = {"bits": 64, "float": true, "be": true};
681

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