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buffer: directly use ArrayBuffer as the pool #8302

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buffer: directly use ArrayBuffer as the pool #8302

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18 changes: 13 additions & 5 deletions lib/buffer.js
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Original file line number Diff line number Diff line change
Expand Up @@ -30,17 +30,21 @@ binding.setupBufferJS(Buffer.prototype, bindingObj);
const zeroFill = bindingObj.zeroFill || [0];

function createUnsafeBuffer(size) {
return new FastBuffer(createUnsafeArrayBuffer(size));
}

function createUnsafeArrayBuffer(size) {
zeroFill[0] = 0;
try {
return new FastBuffer(size);
return new ArrayBuffer(size);
} finally {
zeroFill[0] = 1;
}
}

function createPool() {
poolSize = Buffer.poolSize;
allocPool = createUnsafeBuffer(poolSize);
allocPool = createUnsafeArrayBuffer(poolSize);
poolOffset = 0;
}
createPool();
Expand Down Expand Up @@ -183,7 +187,7 @@ function allocate(size) {
if (size < (Buffer.poolSize >>> 1)) {
if (size > (poolSize - poolOffset))
createPool();
var b = allocPool.slice(poolOffset, poolOffset + size);
var b = new FastBuffer(allocPool, poolOffset, size);
poolOffset += size;
alignPool();
return b;
Expand All @@ -210,8 +214,12 @@ function fromString(string, encoding) {

if (length > (poolSize - poolOffset))
createPool();
var actual = allocPool.write(string, poolOffset, encoding);
var b = allocPool.slice(poolOffset, poolOffset + actual);
var b = new FastBuffer(allocPool, poolOffset, length);
var actual = b.write(string, encoding);
if (actual !== length) {
// byteLength() may overestimate. That’s a rare case, though.
b = new FastBuffer(allocPool, poolOffset, actual);
}
poolOffset += actual;
alignPool();
return b;
Expand Down