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273 lines
9.4 KiB
JavaScript
273 lines
9.4 KiB
JavaScript
7 years ago
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'use strict';
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var global = require('./_global')
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, DESCRIPTORS = require('./_descriptors')
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, LIBRARY = require('./_library')
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, $typed = require('./_typed')
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, hide = require('./_hide')
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, redefineAll = require('./_redefine-all')
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, fails = require('./_fails')
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, anInstance = require('./_an-instance')
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, toInteger = require('./_to-integer')
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, toLength = require('./_to-length')
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, gOPN = require('./_object-gopn').f
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, dP = require('./_object-dp').f
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, arrayFill = require('./_array-fill')
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, setToStringTag = require('./_set-to-string-tag')
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, ARRAY_BUFFER = 'ArrayBuffer'
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, DATA_VIEW = 'DataView'
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, PROTOTYPE = 'prototype'
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, WRONG_LENGTH = 'Wrong length!'
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, WRONG_INDEX = 'Wrong index!'
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, $ArrayBuffer = global[ARRAY_BUFFER]
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, $DataView = global[DATA_VIEW]
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, Math = global.Math
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, RangeError = global.RangeError
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, Infinity = global.Infinity
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, BaseBuffer = $ArrayBuffer
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, abs = Math.abs
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, pow = Math.pow
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, floor = Math.floor
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, log = Math.log
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, LN2 = Math.LN2
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, BUFFER = 'buffer'
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, BYTE_LENGTH = 'byteLength'
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, BYTE_OFFSET = 'byteOffset'
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, $BUFFER = DESCRIPTORS ? '_b' : BUFFER
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, $LENGTH = DESCRIPTORS ? '_l' : BYTE_LENGTH
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, $OFFSET = DESCRIPTORS ? '_o' : BYTE_OFFSET;
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// IEEE754 conversions based on https://github.com/feross/ieee754
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var packIEEE754 = function(value, mLen, nBytes){
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var buffer = Array(nBytes)
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, eLen = nBytes * 8 - mLen - 1
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, eMax = (1 << eLen) - 1
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, eBias = eMax >> 1
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, rt = mLen === 23 ? pow(2, -24) - pow(2, -77) : 0
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, i = 0
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, s = value < 0 || value === 0 && 1 / value < 0 ? 1 : 0
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, e, m, c;
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value = abs(value)
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if(value != value || value === Infinity){
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m = value != value ? 1 : 0;
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e = eMax;
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} else {
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e = floor(log(value) / LN2);
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if(value * (c = pow(2, -e)) < 1){
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e--;
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c *= 2;
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}
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if(e + eBias >= 1){
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value += rt / c;
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} else {
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value += rt * pow(2, 1 - eBias);
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}
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if(value * c >= 2){
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e++;
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c /= 2;
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}
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if(e + eBias >= eMax){
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m = 0;
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e = eMax;
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} else if(e + eBias >= 1){
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m = (value * c - 1) * pow(2, mLen);
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e = e + eBias;
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} else {
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m = value * pow(2, eBias - 1) * pow(2, mLen);
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e = 0;
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}
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}
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for(; mLen >= 8; buffer[i++] = m & 255, m /= 256, mLen -= 8);
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e = e << mLen | m;
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eLen += mLen;
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for(; eLen > 0; buffer[i++] = e & 255, e /= 256, eLen -= 8);
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buffer[--i] |= s * 128;
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return buffer;
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};
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var unpackIEEE754 = function(buffer, mLen, nBytes){
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var eLen = nBytes * 8 - mLen - 1
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, eMax = (1 << eLen) - 1
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, eBias = eMax >> 1
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, nBits = eLen - 7
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, i = nBytes - 1
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, s = buffer[i--]
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, e = s & 127
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, m;
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s >>= 7;
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for(; nBits > 0; e = e * 256 + buffer[i], i--, nBits -= 8);
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m = e & (1 << -nBits) - 1;
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e >>= -nBits;
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nBits += mLen;
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for(; nBits > 0; m = m * 256 + buffer[i], i--, nBits -= 8);
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if(e === 0){
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e = 1 - eBias;
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} else if(e === eMax){
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return m ? NaN : s ? -Infinity : Infinity;
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} else {
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m = m + pow(2, mLen);
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e = e - eBias;
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} return (s ? -1 : 1) * m * pow(2, e - mLen);
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};
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var unpackI32 = function(bytes){
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return bytes[3] << 24 | bytes[2] << 16 | bytes[1] << 8 | bytes[0];
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};
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var packI8 = function(it){
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return [it & 0xff];
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};
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var packI16 = function(it){
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return [it & 0xff, it >> 8 & 0xff];
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};
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var packI32 = function(it){
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return [it & 0xff, it >> 8 & 0xff, it >> 16 & 0xff, it >> 24 & 0xff];
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};
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var packF64 = function(it){
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return packIEEE754(it, 52, 8);
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};
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var packF32 = function(it){
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return packIEEE754(it, 23, 4);
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};
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var addGetter = function(C, key, internal){
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dP(C[PROTOTYPE], key, {get: function(){ return this[internal]; }});
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};
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var get = function(view, bytes, index, isLittleEndian){
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var numIndex = +index
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, intIndex = toInteger(numIndex);
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if(numIndex != intIndex || intIndex < 0 || intIndex + bytes > view[$LENGTH])throw RangeError(WRONG_INDEX);
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var store = view[$BUFFER]._b
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, start = intIndex + view[$OFFSET]
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, pack = store.slice(start, start + bytes);
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return isLittleEndian ? pack : pack.reverse();
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};
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var set = function(view, bytes, index, conversion, value, isLittleEndian){
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var numIndex = +index
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, intIndex = toInteger(numIndex);
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if(numIndex != intIndex || intIndex < 0 || intIndex + bytes > view[$LENGTH])throw RangeError(WRONG_INDEX);
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var store = view[$BUFFER]._b
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, start = intIndex + view[$OFFSET]
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, pack = conversion(+value);
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for(var i = 0; i < bytes; i++)store[start + i] = pack[isLittleEndian ? i : bytes - i - 1];
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};
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var validateArrayBufferArguments = function(that, length){
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anInstance(that, $ArrayBuffer, ARRAY_BUFFER);
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var numberLength = +length
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, byteLength = toLength(numberLength);
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if(numberLength != byteLength)throw RangeError(WRONG_LENGTH);
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return byteLength;
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};
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if(!$typed.ABV){
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$ArrayBuffer = function ArrayBuffer(length){
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var byteLength = validateArrayBufferArguments(this, length);
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this._b = arrayFill.call(Array(byteLength), 0);
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this[$LENGTH] = byteLength;
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};
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$DataView = function DataView(buffer, byteOffset, byteLength){
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anInstance(this, $DataView, DATA_VIEW);
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anInstance(buffer, $ArrayBuffer, DATA_VIEW);
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var bufferLength = buffer[$LENGTH]
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, offset = toInteger(byteOffset);
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if(offset < 0 || offset > bufferLength)throw RangeError('Wrong offset!');
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byteLength = byteLength === undefined ? bufferLength - offset : toLength(byteLength);
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if(offset + byteLength > bufferLength)throw RangeError(WRONG_LENGTH);
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this[$BUFFER] = buffer;
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this[$OFFSET] = offset;
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this[$LENGTH] = byteLength;
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};
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if(DESCRIPTORS){
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addGetter($ArrayBuffer, BYTE_LENGTH, '_l');
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addGetter($DataView, BUFFER, '_b');
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addGetter($DataView, BYTE_LENGTH, '_l');
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addGetter($DataView, BYTE_OFFSET, '_o');
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}
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redefineAll($DataView[PROTOTYPE], {
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getInt8: function getInt8(byteOffset){
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return get(this, 1, byteOffset)[0] << 24 >> 24;
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},
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getUint8: function getUint8(byteOffset){
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return get(this, 1, byteOffset)[0];
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},
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getInt16: function getInt16(byteOffset /*, littleEndian */){
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var bytes = get(this, 2, byteOffset, arguments[1]);
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return (bytes[1] << 8 | bytes[0]) << 16 >> 16;
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},
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getUint16: function getUint16(byteOffset /*, littleEndian */){
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var bytes = get(this, 2, byteOffset, arguments[1]);
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return bytes[1] << 8 | bytes[0];
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},
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getInt32: function getInt32(byteOffset /*, littleEndian */){
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return unpackI32(get(this, 4, byteOffset, arguments[1]));
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},
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getUint32: function getUint32(byteOffset /*, littleEndian */){
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return unpackI32(get(this, 4, byteOffset, arguments[1])) >>> 0;
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},
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getFloat32: function getFloat32(byteOffset /*, littleEndian */){
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return unpackIEEE754(get(this, 4, byteOffset, arguments[1]), 23, 4);
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},
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getFloat64: function getFloat64(byteOffset /*, littleEndian */){
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return unpackIEEE754(get(this, 8, byteOffset, arguments[1]), 52, 8);
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},
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setInt8: function setInt8(byteOffset, value){
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set(this, 1, byteOffset, packI8, value);
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},
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setUint8: function setUint8(byteOffset, value){
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set(this, 1, byteOffset, packI8, value);
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},
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setInt16: function setInt16(byteOffset, value /*, littleEndian */){
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set(this, 2, byteOffset, packI16, value, arguments[2]);
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},
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setUint16: function setUint16(byteOffset, value /*, littleEndian */){
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set(this, 2, byteOffset, packI16, value, arguments[2]);
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},
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setInt32: function setInt32(byteOffset, value /*, littleEndian */){
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set(this, 4, byteOffset, packI32, value, arguments[2]);
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},
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setUint32: function setUint32(byteOffset, value /*, littleEndian */){
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set(this, 4, byteOffset, packI32, value, arguments[2]);
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},
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setFloat32: function setFloat32(byteOffset, value /*, littleEndian */){
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set(this, 4, byteOffset, packF32, value, arguments[2]);
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},
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setFloat64: function setFloat64(byteOffset, value /*, littleEndian */){
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set(this, 8, byteOffset, packF64, value, arguments[2]);
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}
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});
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} else {
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if(!fails(function(){
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new $ArrayBuffer; // eslint-disable-line no-new
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}) || !fails(function(){
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new $ArrayBuffer(.5); // eslint-disable-line no-new
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})){
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$ArrayBuffer = function ArrayBuffer(length){
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return new BaseBuffer(validateArrayBufferArguments(this, length));
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};
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var ArrayBufferProto = $ArrayBuffer[PROTOTYPE] = BaseBuffer[PROTOTYPE];
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for(var keys = gOPN(BaseBuffer), j = 0, key; keys.length > j; ){
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if(!((key = keys[j++]) in $ArrayBuffer))hide($ArrayBuffer, key, BaseBuffer[key]);
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};
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if(!LIBRARY)ArrayBufferProto.constructor = $ArrayBuffer;
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}
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// iOS Safari 7.x bug
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var view = new $DataView(new $ArrayBuffer(2))
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, $setInt8 = $DataView[PROTOTYPE].setInt8;
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view.setInt8(0, 2147483648);
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view.setInt8(1, 2147483649);
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if(view.getInt8(0) || !view.getInt8(1))redefineAll($DataView[PROTOTYPE], {
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setInt8: function setInt8(byteOffset, value){
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$setInt8.call(this, byteOffset, value << 24 >> 24);
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},
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setUint8: function setUint8(byteOffset, value){
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$setInt8.call(this, byteOffset, value << 24 >> 24);
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}
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}, true);
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}
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setToStringTag($ArrayBuffer, ARRAY_BUFFER);
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setToStringTag($DataView, DATA_VIEW);
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hide($DataView[PROTOTYPE], $typed.VIEW, true);
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exports[ARRAY_BUFFER] = $ArrayBuffer;
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exports[DATA_VIEW] = $DataView;
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