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116x 116x 116x 112x 112x 112x 112x 2x 38x 38x 38x 52x 52x 52x 52x 52x 52x 52x 47x 77x 77x 77x 47x 47x 2x 38x 38x 38x 6x 6x 6x 6x 6x 6x 6x 2x 4x 4x 4x 4x 4x 2x 2x 2x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 15x 1x 1x 1x 15x 13x 15x 15x 15x 15x 15x 2x 2x 2x 2x 2x 2x 2x 38x 38x 38x 109x 109x 109x 109x 109x 1x 1x 108x 108x 2592x 2592x 2592x 108x 108x 109x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 30x 30x 30x 30x 30x 1x 1x 29x 29x 29x 29x 30x 90x 90x 90x 90x 90x 57x 57x 57x 90x 4x 4x 90x 24x 24x 29x 14x 14x 14x 14x 10x 10x 30x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x 38x | // Copyright Joyent, Inc. and other Node contributors.
//
// 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.
'use strict';
const {
Array,
ArrayFrom,
ArrayIsArray,
ArrayPrototypeForEach,
ArrayPrototypeIndexOf,
MathFloor,
MathMin,
MathTrunc,
NumberIsNaN,
NumberMAX_SAFE_INTEGER,
NumberMIN_SAFE_INTEGER,
ObjectCreate,
ObjectDefineProperties,
ObjectDefineProperty,
ObjectSetPrototypeOf,
RegExpPrototypeSymbolReplace,
StringPrototypeCharCodeAt,
StringPrototypeSlice,
StringPrototypeToLowerCase,
StringPrototypeTrim,
SymbolSpecies,
SymbolToPrimitive,
TypedArrayPrototypeGetByteLength,
TypedArrayPrototypeFill,
TypedArrayPrototypeSet,
Uint8Array,
Uint8ArrayPrototype,
} = primordials;
const {
byteLengthUtf8,
compare: _compare,
compareOffset,
createFromString,
fill: bindingFill,
indexOfBuffer,
indexOfNumber,
indexOfString,
swap16: _swap16,
swap32: _swap32,
swap64: _swap64,
kMaxLength,
kStringMaxLength
} = internalBinding('buffer');
const {
getOwnNonIndexProperties,
propertyFilter: {
ALL_PROPERTIES,
ONLY_ENUMERABLE
},
} = internalBinding('util');
const {
customInspectSymbol,
isInsideNodeModules,
lazyDOMException,
normalizeEncoding,
kIsEncodingSymbol
} = require('internal/util');
const {
isAnyArrayBuffer,
isArrayBufferView,
isUint8Array
} = require('internal/util/types');
const {
inspect: utilInspect
} = require('internal/util/inspect');
const { encodings } = internalBinding('string_decoder');
const {
codes: {
ERR_BUFFER_OUT_OF_BOUNDS,
ERR_INVALID_ARG_TYPE,
ERR_INVALID_ARG_VALUE,
ERR_INVALID_BUFFER_SIZE,
ERR_OUT_OF_RANGE,
ERR_MISSING_ARGS,
ERR_UNKNOWN_ENCODING
},
genericNodeError,
hideStackFrames,
} = require('internal/errors');
const {
validateArray,
validateBuffer,
validateNumber,
validateInteger,
validateString
} = require('internal/validators');
// Provide validateInteger() but with kMaxLength as the default maximum value.
const validateOffset = (value, name, min = 0, max = kMaxLength) =>
validateInteger(value, name, min, max);
const {
FastBuffer,
markAsUntransferable,
addBufferPrototypeMethods,
createUnsafeBuffer
} = require('internal/buffer');
const {
Blob,
resolveObjectURL,
} = require('internal/blob');
FastBuffer.prototype.constructor = Buffer;
Buffer.prototype = FastBuffer.prototype;
addBufferPrototypeMethods(Buffer.prototype);
const constants = ObjectDefineProperties({}, {
MAX_LENGTH: {
__proto__: null,
value: kMaxLength,
writable: false,
enumerable: true
},
MAX_STRING_LENGTH: {
__proto__: null,
value: kStringMaxLength,
writable: false,
enumerable: true
}
});
Buffer.poolSize = 8 * 1024;
let poolSize, poolOffset, allocPool;
const encodingsMap = ObjectCreate(null);
for (let i = 0; i < encodings.length; ++i)
encodingsMap[encodings[i]] = i;
function createPool() {
poolSize = Buffer.poolSize;
allocPool = createUnsafeBuffer(poolSize).buffer;
markAsUntransferable(allocPool);
poolOffset = 0;
}
createPool();
function alignPool() {
// Ensure aligned slices
if (poolOffset & 0x7) {
poolOffset |= 0x7;
poolOffset++;
}
}
let bufferWarningAlreadyEmitted = false;
let nodeModulesCheckCounter = 0;
const bufferWarning = 'Buffer() is deprecated due to security and usability ' +
'issues. Please use the Buffer.alloc(), ' +
'Buffer.allocUnsafe(), or Buffer.from() methods instead.';
function showFlaggedDeprecation() {
if (bufferWarningAlreadyEmitted ||
++nodeModulesCheckCounter > 10000 ||
(!require('internal/options').getOptionValue('--pending-deprecation') &&
isInsideNodeModules())) {
// We don't emit a warning, because we either:
// - Already did so, or
// - Already checked too many times whether a call is coming
// from node_modules and want to stop slowing down things, or
// - We aren't running with `--pending-deprecation` enabled,
// and the code is inside `node_modules`.
return;
}
process.emitWarning(bufferWarning, 'DeprecationWarning', 'DEP0005');
bufferWarningAlreadyEmitted = true;
}
function toInteger(n, defaultVal) {
n = +n;
if (!NumberIsNaN(n) &&
n >= NumberMIN_SAFE_INTEGER &&
n <= NumberMAX_SAFE_INTEGER) {
return ((n % 1) === 0 ? n : MathFloor(n));
}
return defaultVal;
}
function _copy(source, target, targetStart, sourceStart, sourceEnd) {
if (!isUint8Array(source))
throw new ERR_INVALID_ARG_TYPE('source', ['Buffer', 'Uint8Array'], source);
if (!isUint8Array(target))
throw new ERR_INVALID_ARG_TYPE('target', ['Buffer', 'Uint8Array'], target);
if (targetStart === undefined) {
targetStart = 0;
} else {
targetStart = toInteger(targetStart, 0);
if (targetStart < 0)
throw new ERR_OUT_OF_RANGE('targetStart', '>= 0', targetStart);
}
if (sourceStart === undefined) {
sourceStart = 0;
} else {
sourceStart = toInteger(sourceStart, 0);
if (sourceStart < 0)
throw new ERR_OUT_OF_RANGE('sourceStart', '>= 0', sourceStart);
}
if (sourceEnd === undefined) {
sourceEnd = source.length;
} else {
sourceEnd = toInteger(sourceEnd, 0);
if (sourceEnd < 0)
throw new ERR_OUT_OF_RANGE('sourceEnd', '>= 0', sourceEnd);
}
if (targetStart >= target.length || sourceStart >= sourceEnd)
return 0;
if (sourceStart > source.length) {
throw new ERR_OUT_OF_RANGE('sourceStart',
`<= ${source.length}`,
sourceStart);
}
return _copyActual(source, target, targetStart, sourceStart, sourceEnd);
}
function _copyActual(source, target, targetStart, sourceStart, sourceEnd) {
if (sourceEnd - sourceStart > target.length - targetStart)
sourceEnd = sourceStart + target.length - targetStart;
let nb = sourceEnd - sourceStart;
const sourceLen = source.length - sourceStart;
if (nb > sourceLen)
nb = sourceLen;
if (sourceStart !== 0 || sourceEnd < source.length)
source = new Uint8Array(source.buffer, source.byteOffset + sourceStart, nb);
TypedArrayPrototypeSet(target, source, targetStart);
return nb;
}
/**
* The Buffer() constructor is deprecated in documentation and should not be
* used moving forward. Rather, developers should use one of the three new
* factory APIs: Buffer.from(), Buffer.allocUnsafe() or Buffer.alloc() based on
* their specific needs. There is no runtime deprecation because of the extent
* to which the Buffer constructor is used in the ecosystem currently -- a
* runtime deprecation would introduce too much breakage at this time. It's not
* likely that the Buffer constructors would ever actually be removed.
* Deprecation Code: DEP0005
*/
function Buffer(arg, encodingOrOffset, length) {
showFlaggedDeprecation();
// Common case.
if (typeof arg === 'number') {
if (typeof encodingOrOffset === 'string') {
throw new ERR_INVALID_ARG_TYPE('string', 'string', arg);
}
return Buffer.alloc(arg);
}
return Buffer.from(arg, encodingOrOffset, length);
}
ObjectDefineProperty(Buffer, SymbolSpecies, {
__proto__: null,
enumerable: false,
configurable: true,
get() { return FastBuffer; }
});
/**
* Functionally equivalent to Buffer(arg, encoding) but throws a TypeError
* if value is a number.
* Buffer.from(str[, encoding])
* Buffer.from(array)
* Buffer.from(buffer)
* Buffer.from(arrayBuffer[, byteOffset[, length]])
*/
Buffer.from = function from(value, encodingOrOffset, length) {
if (typeof value === 'string')
return fromString(value, encodingOrOffset);
if (typeof value === 'object' && value !== null) {
if (isAnyArrayBuffer(value))
return fromArrayBuffer(value, encodingOrOffset, length);
const valueOf = value.valueOf && value.valueOf();
if (valueOf != null &&
valueOf !== value &&
(typeof valueOf === 'string' || typeof valueOf === 'object')) {
return from(valueOf, encodingOrOffset, length);
}
const b = fromObject(value);
if (b)
return b;
if (typeof value[SymbolToPrimitive] === 'function') {
const primitive = value[SymbolToPrimitive]('string');
if (typeof primitive === 'string') {
return fromString(primitive, encodingOrOffset);
}
}
}
throw new ERR_INVALID_ARG_TYPE(
'first argument',
['string', 'Buffer', 'ArrayBuffer', 'Array', 'Array-like Object'],
value
);
};
// Identical to the built-in %TypedArray%.of(), but avoids using the deprecated
// Buffer() constructor. Must use arrow function syntax to avoid automatically
// adding a `prototype` property and making the function a constructor.
//
// Refs: https://tc39.github.io/ecma262/#sec-%typedarray%.of
// Refs: https://esdiscuss.org/topic/isconstructor#content-11
const of = (...items) => {
const newObj = createUnsafeBuffer(items.length);
for (let k = 0; k < items.length; k++)
newObj[k] = items[k];
return newObj;
};
Buffer.of = of;
ObjectSetPrototypeOf(Buffer, Uint8Array);
// The 'assertSize' method will remove itself from the callstack when an error
// occurs. This is done simply to keep the internal details of the
// implementation from bleeding out to users.
const assertSize = hideStackFrames((size) => {
validateNumber(size, 'size');
if (!(size >= 0 && size <= kMaxLength)) {
throw new ERR_INVALID_ARG_VALUE.RangeError('size', size);
}
});
/**
* Creates a new filled Buffer instance.
* alloc(size[, fill[, encoding]])
*/
Buffer.alloc = function alloc(size, fill, encoding) {
assertSize(size);
if (fill !== undefined && fill !== 0 && size > 0) {
const buf = createUnsafeBuffer(size);
return _fill(buf, fill, 0, buf.length, encoding);
}
return new FastBuffer(size);
};
/**
* Equivalent to Buffer(num), by default creates a non-zero-filled Buffer
* instance. If `--zero-fill-buffers` is set, will zero-fill the buffer.
*/
Buffer.allocUnsafe = function allocUnsafe(size) {
assertSize(size);
return allocate(size);
};
/**
* Equivalent to SlowBuffer(num), by default creates a non-zero-filled
* Buffer instance that is not allocated off the pre-initialized pool.
* If `--zero-fill-buffers` is set, will zero-fill the buffer.
*/
Buffer.allocUnsafeSlow = function allocUnsafeSlow(size) {
assertSize(size);
return createUnsafeBuffer(size);
};
// If --zero-fill-buffers command line argument is set, a zero-filled
// buffer is returned.
function SlowBuffer(length) {
assertSize(length);
return createUnsafeBuffer(length);
}
ObjectSetPrototypeOf(SlowBuffer.prototype, Uint8ArrayPrototype);
ObjectSetPrototypeOf(SlowBuffer, Uint8Array);
function allocate(size) {
if (size <= 0) {
return new FastBuffer();
}
if (size < (Buffer.poolSize >>> 1)) {
if (size > (poolSize - poolOffset))
createPool();
const b = new FastBuffer(allocPool, poolOffset, size);
poolOffset += size;
alignPool();
return b;
}
return createUnsafeBuffer(size);
}
function fromStringFast(string, ops) {
const length = ops.byteLength(string);
if (length >= (Buffer.poolSize >>> 1))
return createFromString(string, ops.encodingVal);
if (length > (poolSize - poolOffset))
createPool();
let b = new FastBuffer(allocPool, poolOffset, length);
const actual = ops.write(b, string, 0, length);
if (actual !== length) {
// byteLength() may overestimate. That's a rare case, though.
b = new FastBuffer(allocPool, poolOffset, actual);
}
poolOffset += actual;
alignPool();
return b;
}
function fromString(string, encoding) {
let ops;
if (typeof encoding !== 'string' || encoding.length === 0) {
if (string.length === 0)
return new FastBuffer();
ops = encodingOps.utf8;
encoding = undefined;
} else {
ops = getEncodingOps(encoding);
if (ops === undefined)
throw new ERR_UNKNOWN_ENCODING(encoding);
if (string.length === 0)
return new FastBuffer();
}
return fromStringFast(string, ops);
}
function fromArrayBuffer(obj, byteOffset, length) {
// Convert byteOffset to integer
if (byteOffset === undefined) {
byteOffset = 0;
} else {
byteOffset = +byteOffset;
if (NumberIsNaN(byteOffset))
byteOffset = 0;
}
const maxLength = obj.byteLength - byteOffset;
if (maxLength < 0)
throw new ERR_BUFFER_OUT_OF_BOUNDS('offset');
if (length === undefined) {
length = maxLength;
} else {
// Convert length to non-negative integer.
length = +length;
if (length > 0) {
if (length > maxLength)
throw new ERR_BUFFER_OUT_OF_BOUNDS('length');
} else {
length = 0;
}
}
return new FastBuffer(obj, byteOffset, length);
}
function fromArrayLike(obj) {
if (obj.length <= 0)
return new FastBuffer();
if (obj.length < (Buffer.poolSize >>> 1)) {
if (obj.length > (poolSize - poolOffset))
createPool();
const b = new FastBuffer(allocPool, poolOffset, obj.length);
TypedArrayPrototypeSet(b, obj, 0);
poolOffset += obj.length;
alignPool();
return b;
}
return new FastBuffer(obj);
}
function fromObject(obj) {
if (obj.length !== undefined || isAnyArrayBuffer(obj.buffer)) {
if (typeof obj.length !== 'number') {
return new FastBuffer();
}
return fromArrayLike(obj);
}
if (obj.type === 'Buffer' && ArrayIsArray(obj.data)) {
return fromArrayLike(obj.data);
}
}
// Static methods
Buffer.isBuffer = function isBuffer(b) {
return b instanceof Buffer;
};
Buffer.compare = function compare(buf1, buf2) {
if (!isUint8Array(buf1)) {
throw new ERR_INVALID_ARG_TYPE('buf1', ['Buffer', 'Uint8Array'], buf1);
}
if (!isUint8Array(buf2)) {
throw new ERR_INVALID_ARG_TYPE('buf2', ['Buffer', 'Uint8Array'], buf2);
}
if (buf1 === buf2) {
return 0;
}
return _compare(buf1, buf2);
};
Buffer.isEncoding = function isEncoding(encoding) {
return typeof encoding === 'string' && encoding.length !== 0 &&
normalizeEncoding(encoding) !== undefined;
};
Buffer[kIsEncodingSymbol] = Buffer.isEncoding;
Buffer.concat = function concat(list, length) {
validateArray(list, 'list');
if (list.length === 0)
return new FastBuffer();
if (length === undefined) {
length = 0;
for (let i = 0; i < list.length; i++) {
if (list[i].length) {
length += list[i].length;
}
}
} else {
validateOffset(length, 'length');
}
const buffer = Buffer.allocUnsafe(length);
let pos = 0;
for (let i = 0; i < list.length; i++) {
const buf = list[i];
if (!isUint8Array(buf)) {
// TODO(BridgeAR): This should not be of type ERR_INVALID_ARG_TYPE.
// Instead, find the proper error code for this.
throw new ERR_INVALID_ARG_TYPE(
`list[${i}]`, ['Buffer', 'Uint8Array'], list[i]);
}
pos += _copyActual(buf, buffer, pos, 0, buf.length);
}
// Note: `length` is always equal to `buffer.length` at this point
if (pos < length) {
// Zero-fill the remaining bytes if the specified `length` was more than
// the actual total length, i.e. if we have some remaining allocated bytes
// there were not initialized.
TypedArrayPrototypeFill(buffer, 0, pos, length);
}
return buffer;
};
function base64ByteLength(str, bytes) {
// Handle padding
if (StringPrototypeCharCodeAt(str, bytes - 1) === 0x3D)
bytes--;
if (bytes > 1 && StringPrototypeCharCodeAt(str, bytes - 1) === 0x3D)
bytes--;
// Base64 ratio: 3/4
return (bytes * 3) >>> 2;
}
const encodingOps = {
utf8: {
encoding: 'utf8',
encodingVal: encodingsMap.utf8,
byteLength: byteLengthUtf8,
write: (buf, string, offset, len) => buf.utf8Write(string, offset, len),
slice: (buf, start, end) => buf.utf8Slice(start, end),
indexOf: (buf, val, byteOffset, dir) =>
indexOfString(buf, val, byteOffset, encodingsMap.utf8, dir)
},
ucs2: {
encoding: 'ucs2',
encodingVal: encodingsMap.utf16le,
byteLength: (string) => string.length * 2,
write: (buf, string, offset, len) => buf.ucs2Write(string, offset, len),
slice: (buf, start, end) => buf.ucs2Slice(start, end),
indexOf: (buf, val, byteOffset, dir) =>
indexOfString(buf, val, byteOffset, encodingsMap.utf16le, dir)
},
utf16le: {
encoding: 'utf16le',
encodingVal: encodingsMap.utf16le,
byteLength: (string) => string.length * 2,
write: (buf, string, offset, len) => buf.ucs2Write(string, offset, len),
slice: (buf, start, end) => buf.ucs2Slice(start, end),
indexOf: (buf, val, byteOffset, dir) =>
indexOfString(buf, val, byteOffset, encodingsMap.utf16le, dir)
},
latin1: {
encoding: 'latin1',
encodingVal: encodingsMap.latin1,
byteLength: (string) => string.length,
write: (buf, string, offset, len) => buf.latin1Write(string, offset, len),
slice: (buf, start, end) => buf.latin1Slice(start, end),
indexOf: (buf, val, byteOffset, dir) =>
indexOfString(buf, val, byteOffset, encodingsMap.latin1, dir)
},
ascii: {
encoding: 'ascii',
encodingVal: encodingsMap.ascii,
byteLength: (string) => string.length,
write: (buf, string, offset, len) => buf.asciiWrite(string, offset, len),
slice: (buf, start, end) => buf.asciiSlice(start, end),
indexOf: (buf, val, byteOffset, dir) =>
indexOfBuffer(buf,
fromStringFast(val, encodingOps.ascii),
byteOffset,
encodingsMap.ascii,
dir)
},
base64: {
encoding: 'base64',
encodingVal: encodingsMap.base64,
byteLength: (string) => base64ByteLength(string, string.length),
write: (buf, string, offset, len) => buf.base64Write(string, offset, len),
slice: (buf, start, end) => buf.base64Slice(start, end),
indexOf: (buf, val, byteOffset, dir) =>
indexOfBuffer(buf,
fromStringFast(val, encodingOps.base64),
byteOffset,
encodingsMap.base64,
dir)
},
base64url: {
encoding: 'base64url',
encodingVal: encodingsMap.base64url,
byteLength: (string) => base64ByteLength(string, string.length),
write: (buf, string, offset, len) =>
buf.base64urlWrite(string, offset, len),
slice: (buf, start, end) => buf.base64urlSlice(start, end),
indexOf: (buf, val, byteOffset, dir) =>
indexOfBuffer(buf,
fromStringFast(val, encodingOps.base64url),
byteOffset,
encodingsMap.base64url,
dir)
},
hex: {
encoding: 'hex',
encodingVal: encodingsMap.hex,
byteLength: (string) => string.length >>> 1,
write: (buf, string, offset, len) => buf.hexWrite(string, offset, len),
slice: (buf, start, end) => buf.hexSlice(start, end),
indexOf: (buf, val, byteOffset, dir) =>
indexOfBuffer(buf,
fromStringFast(val, encodingOps.hex),
byteOffset,
encodingsMap.hex,
dir)
}
};
function getEncodingOps(encoding) {
encoding += '';
switch (encoding.length) {
case 4:
if (encoding === 'utf8') return encodingOps.utf8;
if (encoding === 'ucs2') return encodingOps.ucs2;
encoding = StringPrototypeToLowerCase(encoding);
if (encoding === 'utf8') return encodingOps.utf8;
if (encoding === 'ucs2') return encodingOps.ucs2;
break;
case 5:
if (encoding === 'utf-8') return encodingOps.utf8;
if (encoding === 'ascii') return encodingOps.ascii;
if (encoding === 'ucs-2') return encodingOps.ucs2;
encoding = StringPrototypeToLowerCase(encoding);
if (encoding === 'utf-8') return encodingOps.utf8;
if (encoding === 'ascii') return encodingOps.ascii;
if (encoding === 'ucs-2') return encodingOps.ucs2;
break;
case 7:
if (encoding === 'utf16le' ||
StringPrototypeToLowerCase(encoding) === 'utf16le')
return encodingOps.utf16le;
break;
case 8:
if (encoding === 'utf-16le' ||
StringPrototypeToLowerCase(encoding) === 'utf-16le')
return encodingOps.utf16le;
break;
case 6:
if (encoding === 'latin1' || encoding === 'binary')
return encodingOps.latin1;
if (encoding === 'base64') return encodingOps.base64;
encoding = StringPrototypeToLowerCase(encoding);
if (encoding === 'latin1' || encoding === 'binary')
return encodingOps.latin1;
if (encoding === 'base64') return encodingOps.base64;
break;
case 3:
if (encoding === 'hex' || StringPrototypeToLowerCase(encoding) === 'hex')
return encodingOps.hex;
break;
case 9:
if (encoding === 'base64url' ||
StringPrototypeToLowerCase(encoding) === 'base64url')
return encodingOps.base64url;
break;
}
}
function byteLength(string, encoding) {
if (typeof string !== 'string') {
if (isArrayBufferView(string) || isAnyArrayBuffer(string)) {
return string.byteLength;
}
throw new ERR_INVALID_ARG_TYPE(
'string', ['string', 'Buffer', 'ArrayBuffer'], string
);
}
const len = string.length;
if (len === 0)
return 0;
if (encoding) {
const ops = getEncodingOps(encoding);
if (ops) {
return ops.byteLength(string);
}
}
return byteLengthUtf8(string);
}
Buffer.byteLength = byteLength;
// For backwards compatibility.
ObjectDefineProperty(Buffer.prototype, 'parent', {
__proto__: null,
enumerable: true,
get() {
if (!(this instanceof Buffer))
return undefined;
return this.buffer;
}
});
ObjectDefineProperty(Buffer.prototype, 'offset', {
__proto__: null,
enumerable: true,
get() {
if (!(this instanceof Buffer))
return undefined;
return this.byteOffset;
}
});
Buffer.prototype.copy =
function copy(target, targetStart, sourceStart, sourceEnd) {
return _copy(this, target, targetStart, sourceStart, sourceEnd);
};
// No need to verify that "buf.length <= MAX_UINT32" since it's a read-only
// property of a typed array.
// This behaves neither like String nor Uint8Array in that we set start/end
// to their upper/lower bounds if the value passed is out of range.
Buffer.prototype.toString = function toString(encoding, start, end) {
if (arguments.length === 0) {
return this.utf8Slice(0, this.length);
}
const len = this.length;
if (start <= 0)
start = 0;
else if (start >= len)
return '';
else
start |= 0;
if (end === undefined || end > len)
end = len;
else
end |= 0;
if (end <= start)
return '';
if (encoding === undefined)
return this.utf8Slice(start, end);
const ops = getEncodingOps(encoding);
if (ops === undefined)
throw new ERR_UNKNOWN_ENCODING(encoding);
return ops.slice(this, start, end);
};
Buffer.prototype.equals = function equals(otherBuffer) {
if (!isUint8Array(otherBuffer)) {
throw new ERR_INVALID_ARG_TYPE(
'otherBuffer', ['Buffer', 'Uint8Array'], otherBuffer);
}
if (this === otherBuffer)
return true;
if (this.byteLength !== otherBuffer.byteLength)
return false;
return this.byteLength === 0 || _compare(this, otherBuffer) === 0;
};
let INSPECT_MAX_BYTES = 50;
// Override how buffers are presented by util.inspect().
Buffer.prototype[customInspectSymbol] = function inspect(recurseTimes, ctx) {
const max = INSPECT_MAX_BYTES;
const actualMax = MathMin(max, this.length);
const remaining = this.length - max;
let str = StringPrototypeTrim(RegExpPrototypeSymbolReplace(
/(.{2})/g, this.hexSlice(0, actualMax), '$1 '));
if (remaining > 0)
str += ` ... ${remaining} more byte${remaining > 1 ? 's' : ''}`;
// Inspect special properties as well, if possible.
if (ctx) {
let extras = false;
const filter = ctx.showHidden ? ALL_PROPERTIES : ONLY_ENUMERABLE;
const obj = ObjectCreate(null);
ArrayPrototypeForEach(getOwnNonIndexProperties(this, filter),
(key) => {
extras = true;
obj[key] = this[key];
});
if (extras) {
if (this.length !== 0)
str += ', ';
// '[Object: null prototype] {'.length === 26
// This is guarded with a test.
str += StringPrototypeSlice(utilInspect(obj, {
...ctx,
breakLength: Infinity,
compact: true
}), 27, -2);
}
}
return `<${this.constructor.name} ${str}>`;
};
Buffer.prototype.inspect = Buffer.prototype[customInspectSymbol];
Buffer.prototype.compare = function compare(target,
targetStart,
targetEnd,
sourceStart,
sourceEnd) {
if (!isUint8Array(target)) {
throw new ERR_INVALID_ARG_TYPE('target', ['Buffer', 'Uint8Array'], target);
}
if (arguments.length === 1)
return _compare(this, target);
if (targetStart === undefined)
targetStart = 0;
else
validateOffset(targetStart, 'targetStart');
if (targetEnd === undefined)
targetEnd = target.length;
else
validateOffset(targetEnd, 'targetEnd', 0, target.length);
if (sourceStart === undefined)
sourceStart = 0;
else
validateOffset(sourceStart, 'sourceStart');
if (sourceEnd === undefined)
sourceEnd = this.length;
else
validateOffset(sourceEnd, 'sourceEnd', 0, this.length);
if (sourceStart >= sourceEnd)
return (targetStart >= targetEnd ? 0 : -1);
if (targetStart >= targetEnd)
return 1;
return compareOffset(this, target, targetStart, sourceStart, targetEnd,
sourceEnd);
};
// Finds either the first index of `val` in `buffer` at offset >= `byteOffset`,
// OR the last index of `val` in `buffer` at offset <= `byteOffset`.
//
// Arguments:
// - buffer - a Buffer to search
// - val - a string, Buffer, or number
// - byteOffset - an index into `buffer`; will be clamped to an int32
// - encoding - an optional encoding, relevant if val is a string
// - dir - true for indexOf, false for lastIndexOf
function bidirectionalIndexOf(buffer, val, byteOffset, encoding, dir) {
validateBuffer(buffer);
if (typeof byteOffset === 'string') {
encoding = byteOffset;
byteOffset = undefined;
} else if (byteOffset > 0x7fffffff) {
byteOffset = 0x7fffffff;
} else if (byteOffset < -0x80000000) {
byteOffset = -0x80000000;
}
// Coerce to Number. Values like null and [] become 0.
byteOffset = +byteOffset;
// If the offset is undefined, "foo", {}, coerces to NaN, search whole buffer.
if (NumberIsNaN(byteOffset)) {
byteOffset = dir ? 0 : (buffer.length || buffer.byteLength);
}
dir = !!dir; // Cast to bool.
if (typeof val === 'number')
return indexOfNumber(buffer, val >>> 0, byteOffset, dir);
let ops;
if (encoding === undefined)
ops = encodingOps.utf8;
else
ops = getEncodingOps(encoding);
if (typeof val === 'string') {
if (ops === undefined)
throw new ERR_UNKNOWN_ENCODING(encoding);
return ops.indexOf(buffer, val, byteOffset, dir);
}
if (isUint8Array(val)) {
const encodingVal =
(ops === undefined ? encodingsMap.utf8 : ops.encodingVal);
return indexOfBuffer(buffer, val, byteOffset, encodingVal, dir);
}
throw new ERR_INVALID_ARG_TYPE(
'value', ['number', 'string', 'Buffer', 'Uint8Array'], val
);
}
Buffer.prototype.indexOf = function indexOf(val, byteOffset, encoding) {
return bidirectionalIndexOf(this, val, byteOffset, encoding, true);
};
Buffer.prototype.lastIndexOf = function lastIndexOf(val, byteOffset, encoding) {
return bidirectionalIndexOf(this, val, byteOffset, encoding, false);
};
Buffer.prototype.includes = function includes(val, byteOffset, encoding) {
return this.indexOf(val, byteOffset, encoding) !== -1;
};
// Usage:
// buffer.fill(number[, offset[, end]])
// buffer.fill(buffer[, offset[, end]])
// buffer.fill(string[, offset[, end]][, encoding])
Buffer.prototype.fill = function fill(value, offset, end, encoding) {
return _fill(this, value, offset, end, encoding);
};
function _fill(buf, value, offset, end, encoding) {
if (typeof value === 'string') {
if (offset === undefined || typeof offset === 'string') {
encoding = offset;
offset = 0;
end = buf.length;
} else if (typeof end === 'string') {
encoding = end;
end = buf.length;
}
const normalizedEncoding = normalizeEncoding(encoding);
if (normalizedEncoding === undefined) {
validateString(encoding, 'encoding');
throw new ERR_UNKNOWN_ENCODING(encoding);
}
if (value.length === 0) {
// If value === '' default to zero.
value = 0;
} else if (value.length === 1) {
// Fast path: If `value` fits into a single byte, use that numeric value.
if (normalizedEncoding === 'utf8') {
const code = StringPrototypeCharCodeAt(value, 0);
if (code < 128) {
value = code;
}
} else if (normalizedEncoding === 'latin1') {
value = StringPrototypeCharCodeAt(value, 0);
}
}
} else {
encoding = undefined;
}
if (offset === undefined) {
offset = 0;
end = buf.length;
} else {
validateOffset(offset, 'offset');
// Invalid ranges are not set to a default, so can range check early.
if (end === undefined) {
end = buf.length;
} else {
validateOffset(end, 'end', 0, buf.length);
}
if (offset >= end)
return buf;
}
if (typeof value === 'number') {
// OOB check
const byteLen = TypedArrayPrototypeGetByteLength(buf);
const fillLength = end - offset;
if (offset > end || fillLength + offset > byteLen)
throw new ERR_BUFFER_OUT_OF_BOUNDS();
TypedArrayPrototypeFill(buf, value, offset, end);
} else {
const res = bindingFill(buf, value, offset, end, encoding);
if (res < 0) {
if (res === -1)
throw new ERR_INVALID_ARG_VALUE('value', value);
throw new ERR_BUFFER_OUT_OF_BOUNDS();
}
}
return buf;
}
Buffer.prototype.write = function write(string, offset, length, encoding) {
// Buffer#write(string);
if (offset === undefined) {
return this.utf8Write(string, 0, this.length);
}
// Buffer#write(string, encoding)
if (length === undefined && typeof offset === 'string') {
encoding = offset;
length = this.length;
offset = 0;
// Buffer#write(string, offset[, length][, encoding])
} else {
validateOffset(offset, 'offset', 0, this.length);
const remaining = this.length - offset;
if (length === undefined) {
length = remaining;
} else if (typeof length === 'string') {
encoding = length;
length = remaining;
} else {
validateOffset(length, 'length', 0, this.length);
if (length > remaining)
length = remaining;
}
}
if (!encoding)
return this.utf8Write(string, offset, length);
const ops = getEncodingOps(encoding);
if (ops === undefined)
throw new ERR_UNKNOWN_ENCODING(encoding);
return ops.write(this, string, offset, length);
};
Buffer.prototype.toJSON = function toJSON() {
if (this.length > 0) {
const data = new Array(this.length);
for (let i = 0; i < this.length; ++i)
data[i] = this[i];
return { type: 'Buffer', data };
}
return { type: 'Buffer', data: [] };
};
function adjustOffset(offset, length) {
// Use Math.trunc() to convert offset to an integer value that can be larger
// than an Int32. Hence, don't use offset | 0 or similar techniques.
offset = MathTrunc(offset);
if (offset === 0) {
return 0;
}
if (offset < 0) {
offset += length;
return offset > 0 ? offset : 0;
}
if (offset < length) {
return offset;
}
return NumberIsNaN(offset) ? 0 : length;
}
Buffer.prototype.subarray = function subarray(start, end) {
const srcLength = this.length;
start = adjustOffset(start, srcLength);
end = end !== undefined ? adjustOffset(end, srcLength) : srcLength;
const newLength = end > start ? end - start : 0;
return new FastBuffer(this.buffer, this.byteOffset + start, newLength);
};
Buffer.prototype.slice = function slice(start, end) {
return this.subarray(start, end);
};
function swap(b, n, m) {
const i = b[n];
b[n] = b[m];
b[m] = i;
}
Buffer.prototype.swap16 = function swap16() {
// For Buffer.length < 128, it's generally faster to
// do the swap in javascript. For larger buffers,
// dropping down to the native code is faster.
const len = this.length;
if (len % 2 !== 0)
throw new ERR_INVALID_BUFFER_SIZE('16-bits');
if (len < 128) {
for (let i = 0; i < len; i += 2)
swap(this, i, i + 1);
return this;
}
return _swap16(this);
};
Buffer.prototype.swap32 = function swap32() {
// For Buffer.length < 192, it's generally faster to
// do the swap in javascript. For larger buffers,
// dropping down to the native code is faster.
const len = this.length;
if (len % 4 !== 0)
throw new ERR_INVALID_BUFFER_SIZE('32-bits');
if (len < 192) {
for (let i = 0; i < len; i += 4) {
swap(this, i, i + 3);
swap(this, i + 1, i + 2);
}
return this;
}
return _swap32(this);
};
Buffer.prototype.swap64 = function swap64() {
// For Buffer.length < 192, it's generally faster to
// do the swap in javascript. For larger buffers,
// dropping down to the native code is faster.
const len = this.length;
if (len % 8 !== 0)
throw new ERR_INVALID_BUFFER_SIZE('64-bits');
if (len < 192) {
for (let i = 0; i < len; i += 8) {
swap(this, i, i + 7);
swap(this, i + 1, i + 6);
swap(this, i + 2, i + 5);
swap(this, i + 3, i + 4);
}
return this;
}
return _swap64(this);
};
Buffer.prototype.toLocaleString = Buffer.prototype.toString;
let transcode;
if (internalBinding('config').hasIntl) {
const {
icuErrName,
transcode: _transcode
} = internalBinding('icu');
// Transcodes the Buffer from one encoding to another, returning a new
// Buffer instance.
transcode = function transcode(source, fromEncoding, toEncoding) {
if (!isUint8Array(source)) {
throw new ERR_INVALID_ARG_TYPE('source',
['Buffer', 'Uint8Array'], source);
}
if (source.length === 0) return Buffer.alloc(0);
fromEncoding = normalizeEncoding(fromEncoding) || fromEncoding;
toEncoding = normalizeEncoding(toEncoding) || toEncoding;
const result = _transcode(source, fromEncoding, toEncoding);
if (typeof result !== 'number')
return result;
const code = icuErrName(result);
const err = genericNodeError(
`Unable to transcode Buffer [${code}]`,
{ code: code, errno: result }
);
throw err;
};
}
function btoa(input) {
// The implementation here has not been performance optimized in any way and
// should not be.
// Refs: https://github.com/nodejs/node/pull/38433#issuecomment-828426932
if (arguments.length === 0) {
throw new ERR_MISSING_ARGS('input');
}
input = `${input}`;
for (let n = 0; n < input.length; n++) {
if (input[n].charCodeAt(0) > 0xff)
throw lazyDOMException('Invalid character', 'InvalidCharacterError');
}
const buf = Buffer.from(input, 'latin1');
return buf.toString('base64');
}
// Refs: https://infra.spec.whatwg.org/#forgiving-base64-decode
const kForgivingBase64AllowedChars = [
// ASCII whitespace
// Refs: https://infra.spec.whatwg.org/#ascii-whitespace
0x09, 0x0A, 0x0C, 0x0D, 0x20,
// Uppercase letters
...ArrayFrom({ length: 26 }, (_, i) => StringPrototypeCharCodeAt('A') + i),
// Lowercase letters
...ArrayFrom({ length: 26 }, (_, i) => StringPrototypeCharCodeAt('a') + i),
// Decimal digits
...ArrayFrom({ length: 10 }, (_, i) => StringPrototypeCharCodeAt('0') + i),
0x2B, // +
0x2F, // /
0x3D, // =
];
function atob(input) {
// The implementation here has not been performance optimized in any way and
// should not be.
// Refs: https://github.com/nodejs/node/pull/38433#issuecomment-828426932
if (arguments.length === 0) {
throw new ERR_MISSING_ARGS('input');
}
input = `${input}`;
let nonAsciiWhitespaceCharCount = 0;
for (let n = 0; n < input.length; n++) {
const index = ArrayPrototypeIndexOf(
kForgivingBase64AllowedChars,
StringPrototypeCharCodeAt(input, n));
if (index > 4) {
// The first 5 elements of `kForgivingBase64AllowedChars` are
// ASCII whitespace char codes.
nonAsciiWhitespaceCharCount++;
} else if (index === -1) {
throw lazyDOMException('Invalid character', 'InvalidCharacterError');
}
}
// See #3 - https://infra.spec.whatwg.org/#forgiving-base64
if (nonAsciiWhitespaceCharCount % 4 === 1) {
throw lazyDOMException(
'The string to be decoded is not correctly encoded.',
'InvalidCharacterError');
}
return Buffer.from(input, 'base64').toString('latin1');
}
module.exports = {
Blob,
resolveObjectURL,
Buffer,
SlowBuffer,
transcode,
// Legacy
kMaxLength,
kStringMaxLength,
btoa,
atob,
};
ObjectDefineProperties(module.exports, {
constants: {
__proto__: null,
configurable: false,
enumerable: true,
value: constants
},
INSPECT_MAX_BYTES: {
__proto__: null,
configurable: true,
enumerable: true,
get() { return INSPECT_MAX_BYTES; },
set(val) { INSPECT_MAX_BYTES = val; }
}
});
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