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Copy pathbuffer.js
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1469 lines (1304 loc) · 41.6 KB
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// 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,
ArrayBufferIsView,
ArrayIsArray,
ArrayPrototypeForEach,
MathFloor,
MathMin,
MathTrunc,
NumberIsInteger,
NumberIsNaN,
NumberMAX_SAFE_INTEGER,
NumberMIN_SAFE_INTEGER,
ObjectDefineProperties,
ObjectDefineProperty,
ObjectPrototypeHasOwnProperty,
ObjectSetPrototypeOf,
RegExpPrototypeSymbolReplace,
StringPrototypeCharCodeAt,
StringPrototypeSlice,
StringPrototypeToLowerCase,
StringPrototypeTrim,
SymbolSpecies,
SymbolToPrimitive,
TypedArrayPrototypeFill,
TypedArrayPrototypeGetBuffer,
TypedArrayPrototypeGetByteLength,
TypedArrayPrototypeGetByteOffset,
TypedArrayPrototypeGetLength,
TypedArrayPrototypeSet,
TypedArrayPrototypeSubarray,
Uint8Array,
} = primordials;
const {
byteLengthUtf8,
compare: _compare,
compareOffset,
copy: _copy,
fill: bindingFill,
isAscii: bindingIsAscii,
isUtf8: bindingIsUtf8,
indexOfBuffer,
indexOfNumber,
indexOfString,
swap16: _swap16,
swap32: _swap32,
swap64: _swap64,
kMaxLength,
kStringMaxLength,
atob: _atob,
btoa: _btoa,
asciiSlice,
base64Slice,
base64urlSlice,
latin1Slice,
hexSlice,
ucs2Slice,
utf8Slice,
base64Write,
base64urlWrite,
hexWrite,
ucs2Write,
} = internalBinding('buffer');
const {
constants: {
ALL_PROPERTIES,
ONLY_ENUMERABLE,
},
getOwnNonIndexProperties,
isInsideNodeModules,
} = internalBinding('util');
const {
customInspectSymbol,
lazyDOMException,
normalizeEncoding,
kIsEncodingSymbol,
defineLazyProperties,
encodingsMap,
} = require('internal/util');
const {
isAnyArrayBuffer,
isArrayBufferView,
isUint8Array,
isTypedArray,
} = require('internal/util/types');
const {
inspect: utilInspect,
} = require('internal/util/inspect');
const {
codes: {
ERR_BUFFER_OUT_OF_BOUNDS,
ERR_INVALID_ARG_TYPE,
ERR_INVALID_ARG_VALUE,
ERR_INVALID_BUFFER_SIZE,
ERR_MISSING_ARGS,
ERR_OUT_OF_RANGE,
ERR_UNKNOWN_ENCODING,
},
genericNodeError,
} = require('internal/errors');
const {
validateArray,
validateBuffer,
validateInteger,
validateNumber,
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,
asciiWrite,
latin1Write,
utf8Write,
} = require('internal/buffer');
const {
namespace: {
addDeserializeCallback,
isBuildingSnapshot,
},
} = require('internal/v8/startup_snapshot');
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 = 64 * 1024;
let poolSize, poolOffset, allocPool, allocBuffer;
function createPool() {
poolSize = Buffer.poolSize;
allocBuffer = createUnsafeBuffer(poolSize);
allocPool = allocBuffer.buffer;
markAsUntransferable(allocPool);
poolOffset = 0;
}
createPool();
if (isBuildingSnapshot()) {
addDeserializeCallback(() => {
// TODO(legendecas): ArrayBuffer.[[ArrayBufferDetachKey]] is not been serialized.
// Remove this callback when snapshot serialization supports it.
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(3))) {
// 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`.
// - If the topmost non-internal frame is not 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 copyImpl(source, target, targetStart, sourceStart, sourceEnd) {
if (!ArrayBufferIsView(source))
throw new ERR_INVALID_ARG_TYPE('source', ['Buffer', 'Uint8Array'], source);
if (!ArrayBufferIsView(target))
throw new ERR_INVALID_ARG_TYPE('target', ['Buffer', 'Uint8Array'], target);
if (targetStart === undefined) {
targetStart = 0;
} else {
targetStart = NumberIsInteger(targetStart) ? targetStart : toInteger(targetStart, 0);
if (targetStart < 0)
throw new ERR_OUT_OF_RANGE('targetStart', '>= 0', targetStart);
}
if (sourceStart === undefined) {
sourceStart = 0;
} else {
sourceStart = NumberIsInteger(sourceStart) ? sourceStart : toInteger(sourceStart, 0);
if (sourceStart < 0 || sourceStart > source.byteLength)
throw new ERR_OUT_OF_RANGE('sourceStart', `>= 0 && <= ${source.byteLength}`, sourceStart);
}
if (sourceEnd === undefined) {
sourceEnd = source.byteLength;
} else {
sourceEnd = NumberIsInteger(sourceEnd) ? sourceEnd : toInteger(sourceEnd, 0);
if (sourceEnd < 0)
throw new ERR_OUT_OF_RANGE('sourceEnd', '>= 0', sourceEnd);
}
if (targetStart >= target.byteLength || sourceStart >= sourceEnd)
return 0;
return _copyActual(source, target, targetStart, sourceStart, sourceEnd);
}
function _copyActual(source, target, targetStart, sourceStart, sourceEnd) {
if (sourceEnd - sourceStart > target.byteLength - targetStart)
sourceEnd = sourceStart + target.byteLength - targetStart;
let nb = sourceEnd - sourceStart;
const sourceLen = source.byteLength - sourceStart;
if (nb > sourceLen)
nb = sourceLen;
if (nb <= 0)
return 0;
// `_copy` returns the number of bytes actually copied, which is `nb` except
// when the target is backed by a detached or immutable ArrayBuffer, in which
// case nothing is copied and it returns 0.
return _copy(source, target, targetStart, sourceStart, 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
* @returns {Buffer}
*/
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]])
* @param {any} value
* @param {BufferEncoding|number} encodingOrOffset
* @param {number} [length]
* @returns {Buffer}
*/
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,
);
};
/**
* Creates the Buffer as a copy of the underlying ArrayBuffer of the view
* rather than the contents of the view.
* @param {TypedArray} view
* @param {number} [offset]
* @param {number} [length]
* @returns {Buffer}
*/
Buffer.copyBytesFrom = function copyBytesFrom(view, offset, length) {
if (!isTypedArray(view)) {
throw new ERR_INVALID_ARG_TYPE('view', [ 'TypedArray' ], view);
}
const viewLength = TypedArrayPrototypeGetLength(view);
if (viewLength === 0) {
return new FastBuffer();
}
let start = 0;
let end = viewLength;
if (offset !== undefined) {
validateInteger(offset, 'offset', 0);
if (offset >= viewLength) return new FastBuffer();
start = offset;
}
if (length !== undefined) {
validateInteger(length, 'length', 0);
// The old code used TypedArrayPrototypeSlice which clamps internally.
end = MathMin(start + length, viewLength);
}
if (end <= start) return new FastBuffer();
const viewByteLength = TypedArrayPrototypeGetByteLength(view);
const elementSize = viewByteLength / viewLength;
const srcByteOffset = TypedArrayPrototypeGetByteOffset(view) +
start * elementSize;
const srcByteLength = (end - start) * elementSize;
return fromArrayLike(new Uint8Array(
TypedArrayPrototypeGetBuffer(view),
srcByteOffset,
srcByteLength));
};
// 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 len = items.length;
const newObj = new FastBuffer(len); // In heap for small sizes
for (let k = 0; k < len; k++)
newObj[k] = items[k];
return newObj;
};
Buffer.of = of;
ObjectSetPrototypeOf(Buffer, Uint8Array);
/**
* Creates a new filled Buffer instance.
* alloc(size[, fill[, encoding]])
* @returns {FastBuffer}
*/
Buffer.alloc = function alloc(size, fill, encoding) {
validateNumber(size, 'size', 0, kMaxLength);
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.
* @returns {FastBuffer}
*/
Buffer.allocUnsafe = function allocUnsafe(size) {
validateNumber(size, 'size', 0, kMaxLength);
return allocate(size);
};
/**
* 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.
* @param {number} size
* @returns {FastBuffer|undefined}
*/
Buffer.allocUnsafeSlow = function allocUnsafeSlow(size) {
validateNumber(size, 'size', 0, kMaxLength);
return createUnsafeBuffer(size);
};
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 maxLength = Buffer.poolSize >>> 1;
let length = string.length; // Min length
if (length >= maxLength)
return createFromString(string, ops);
length *= 4; // Max length (4 bytes per character)
if (length >= maxLength)
length = ops.byteLength(string); // Actual length
if (length >= maxLength)
return createFromString(string, ops, length);
if (length > (poolSize - poolOffset))
createPool();
const actual = ops.write(allocBuffer, string, poolOffset, length);
const b = new FastBuffer(allocPool, poolOffset, actual);
poolOffset += actual;
alignPool();
return b;
}
function createFromString(string, ops, length = ops.byteLength(string)) {
const buf = Buffer.allocUnsafeSlow(length);
const actual = ops.write(buf, string, 0, length);
return actual < length ? new FastBuffer(buf.buffer, 0, actual) : buf;
}
function fromString(string, encoding) {
let ops;
if (!encoding || encoding === 'utf8' || typeof encoding !== 'string') {
ops = encodingOps.utf8;
} else {
ops = getEncodingOps(encoding);
if (ops === undefined)
throw new ERR_UNKNOWN_ENCODING(encoding);
}
return string.length === 0 ? new FastBuffer() : 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) {
// 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) {
const { length } = obj;
if (length <= 0)
return new FastBuffer();
if (length < (Buffer.poolSize >>> 1)) {
if (length > (poolSize - poolOffset))
createPool();
const b = new FastBuffer(allocPool, poolOffset, length);
TypedArrayPrototypeSet(b, obj, 0);
poolOffset += 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++) {
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'], buf);
}
length += TypedArrayPrototypeGetByteLength(buf);
}
const buffer = allocate(length);
let pos = 0;
for (let i = 0; i < list.length; i++) {
const buf = list[i];
const bufLength = TypedArrayPrototypeGetByteLength(buf);
TypedArrayPrototypeSet(buffer, buf, pos);
pos += bufLength;
}
if (pos < length) {
TypedArrayPrototypeFill(buffer, 0, pos, length);
}
return buffer;
}
validateOffset(length, 'length');
for (let i = 0; i < list.length; i++) {
if (!isUint8Array(list[i])) {
// 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]);
}
}
const buffer = allocate(length);
let pos = 0;
for (let i = 0; i < list.length; i++) {
const buf = list[i];
const bufLength = TypedArrayPrototypeGetByteLength(buf);
if (pos + bufLength > length) {
TypedArrayPrototypeSet(buffer,
TypedArrayPrototypeSubarray(buf, 0, length - pos),
pos);
pos = length;
break;
}
TypedArrayPrototypeSet(buffer, buf, pos);
pos += bufLength;
}
// 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: utf8Write,
slice: utf8Slice,
indexOf: (buf, val, byteOffset, dir, end) =>
indexOfString(buf, val, byteOffset, encodingsMap.utf8, dir, end),
},
ucs2: {
encoding: 'ucs2',
encodingVal: encodingsMap.utf16le,
byteLength: (string) => string.length * 2,
write: ucs2Write,
slice: ucs2Slice,
indexOf: (buf, val, byteOffset, dir, end) =>
indexOfString(buf, val, byteOffset, encodingsMap.utf16le, dir, end),
},
utf16le: {
encoding: 'utf16le',
encodingVal: encodingsMap.utf16le,
byteLength: (string) => string.length * 2,
write: ucs2Write,
slice: ucs2Slice,
indexOf: (buf, val, byteOffset, dir, end) =>
indexOfString(buf, val, byteOffset, encodingsMap.utf16le, dir, end),
},
latin1: {
encoding: 'latin1',
encodingVal: encodingsMap.latin1,
byteLength: (string) => string.length,
write: latin1Write,
slice: latin1Slice,
indexOf: (buf, val, byteOffset, dir, end) =>
indexOfString(buf, val, byteOffset, encodingsMap.latin1, dir, end),
},
ascii: {
encoding: 'ascii',
encodingVal: encodingsMap.ascii,
byteLength: (string) => string.length,
write: asciiWrite,
slice: asciiSlice,
indexOf: (buf, val, byteOffset, dir, end) =>
indexOfBuffer(buf,
fromStringFast(val, encodingOps.ascii),
byteOffset,
encodingsMap.ascii,
dir,
end),
},
base64: {
encoding: 'base64',
encodingVal: encodingsMap.base64,
byteLength: (string) => base64ByteLength(string, string.length),
write: base64Write,
slice: base64Slice,
indexOf: (buf, val, byteOffset, dir, end) =>
indexOfBuffer(buf,
fromStringFast(val, encodingOps.base64),
byteOffset,
encodingsMap.base64,
dir,
end),
},
base64url: {
encoding: 'base64url',
encodingVal: encodingsMap.base64url,
byteLength: (string) => base64ByteLength(string, string.length),
write: base64urlWrite,
slice: base64urlSlice,
indexOf: (buf, val, byteOffset, dir, end) =>
indexOfBuffer(buf,
fromStringFast(val, encodingOps.base64url),
byteOffset,
encodingsMap.base64url,
dir,
end),
},
hex: {
encoding: 'hex',
encodingVal: encodingsMap.hex,
byteLength: (string) => string.length >>> 1,
write: hexWrite,
slice: hexSlice,
indexOf: (buf, val, byteOffset, dir, end) =>
indexOfBuffer(buf,
fromStringFast(val, encodingOps.hex),
byteOffset,
encodingsMap.hex,
dir,
end),
},
};
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 || encoding === 'utf8') {
return byteLengthUtf8(string);
}
if (encoding === 'ascii') {
return len;
}
const ops = getEncodingOps(encoding);
if (ops === undefined) {
// TODO (ronag): Makes more sense to throw here.
// throw new ERR_UNKNOWN_ENCODING(encoding);
return byteLengthUtf8(string);
}
return ops.byteLength(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 copyImpl(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 utf8Slice(this, 0, this.length);
}
const bufferLength = TypedArrayPrototypeGetLength(this);
if (start <= 0)
start = 0;
else if (start >= bufferLength)
return '';
else
start = MathTrunc(start) || 0;
if (end === undefined || end > bufferLength)
end = bufferLength;
else
end = MathTrunc(end) || 0;
if (end <= start)
return '';
if (encoding === undefined)
return utf8Slice(this, 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;
const len = TypedArrayPrototypeGetByteLength(this);
if (len !== TypedArrayPrototypeGetByteLength(otherBuffer))
return false;
return len === 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, hexSlice(this, 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 = { __proto__: 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);
}
}
let constructorName = 'Buffer';
try {
const { constructor } = this;
if (typeof constructor === 'function' && ObjectPrototypeHasOwnProperty(constructor, 'name')) {
constructorName = constructor.name;
}
} catch { /* Ignore error and use default name */ }
return `<${constructorName} ${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);
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