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buffer: avoid use of arguments #11358

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buffer: avoid use of arguments #11358

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97e336e
buffer: avoid use of arguments
jasnell Feb 13, 2017
f20117f
buffer: refactor slowToString
jasnell Feb 15, 2017
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28 changes: 14 additions & 14 deletions lib/buffer.js
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Original file line number Diff line number Diff line change
Expand Up @@ -433,10 +433,10 @@ Object.defineProperty(Buffer.prototype, 'offset', {
});


function slowToString(encoding, start, end) {
function slowToString(buf, encoding, start, end) {
var loweredCase = false;

// No need to verify that "this.length <= MAX_UINT32" since it's a read-only
// 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
Expand All @@ -445,13 +445,13 @@ function slowToString(encoding, start, end) {
// Section 13.3.3.7 Runtime Semantics: KeyedBindingInitialization.
if (start === undefined || start < 0)
start = 0;
// Return early if start > this.length. Done here to prevent potential uint32
// Return early if start > buf.length. Done here to prevent potential uint32
// coercion fail below.
if (start > this.length)
if (start > buf.length)
return '';

if (end === undefined || end > this.length)
end = this.length;
if (end === undefined || end > buf.length)
end = buf.length;

if (end <= 0)
return '';
Expand All @@ -468,27 +468,27 @@ function slowToString(encoding, start, end) {
while (true) {
switch (encoding) {
case 'hex':
return this.hexSlice(start, end);
return buf.hexSlice(start, end);

case 'utf8':
case 'utf-8':
return this.utf8Slice(start, end);
return buf.utf8Slice(start, end);

case 'ascii':
return this.asciiSlice(start, end);
return buf.asciiSlice(start, end);

case 'latin1':
case 'binary':
return this.latin1Slice(start, end);
return buf.latin1Slice(start, end);

case 'base64':
return this.base64Slice(start, end);
return buf.base64Slice(start, end);

case 'ucs2':
case 'ucs-2':
case 'utf16le':
case 'utf-16le':
return this.ucs2Slice(start, end);
return buf.ucs2Slice(start, end);

default:
if (loweredCase)
Expand All @@ -503,12 +503,12 @@ Buffer.prototype.copy = function(target, targetStart, sourceStart, sourceEnd) {
return binding.copy(this, target, targetStart, sourceStart, sourceEnd);
};

Buffer.prototype.toString = function() {
Buffer.prototype.toString = function(encoding, start, end) {
let result;
if (arguments.length === 0) {
result = this.utf8Slice(0, this.length);
} else {
result = slowToString.apply(this, arguments);
result = slowToString(this, encoding, start, end);
}
if (result === undefined)
throw new Error('"toString()" failed');
Expand Down