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buffer: zero-length buffers shouldn't be slab-backed

pull/24504/head
Bert Belder 2013-01-05 22:14:50 +01:00
parent 45024e7b75
commit a6b8f63660
1 changed files with 8 additions and 2 deletions
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10
lib/buffer.js
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@ -199,8 +199,9 @@ function coerce(length) {
} }
// Buffer var zeroBuffer = new SlowBuffer(0);
// Buffer
function Buffer(subject, encoding, offset) { function Buffer(subject, encoding, offset) {
if (!(this instanceof Buffer)) { if (!(this instanceof Buffer)) {
return new Buffer(subject, encoding, offset); return new Buffer(subject, encoding, offset);
@ -242,13 +243,18 @@ function Buffer(subject, encoding, offset) {
this.parent = new SlowBuffer(this.length); this.parent = new SlowBuffer(this.length);
this.offset = 0; this.offset = 0;
} else { } else if (this.length > 0) {
// Small buffer. // Small buffer.
if (!pool || pool.length - pool.used < this.length) allocPool(); if (!pool || pool.length - pool.used < this.length) allocPool();
this.parent = pool; this.parent = pool;
this.offset = pool.used; this.offset = pool.used;
pool.used += this.length; pool.used += this.length;
if (pool.used & 7) pool.used = (pool.used + 8) & ~7; if (pool.used & 7) pool.used = (pool.used + 8) & ~7;
} else {
// Zero-length buffer
this.parent = zeroBuffer;
this.offset = 0;
} }
// Treat array-ish objects as a byte array. // Treat array-ish objects as a byte array.