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buffer: coerce offset to integer #18215

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buffer: coerce offset to integer #18215

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4 changes: 4 additions & 0 deletions lib/buffer.js
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Original file line number Diff line number Diff line change
Expand Up @@ -1272,25 +1272,29 @@ function toFloat(x) {


Buffer.prototype.readDoubleBE = function(offset, noAssert) {
offset = offset >>> 0;
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hmm... I'd almost prefer to make this an error rather than coerce. If someone just happens to pass in 4294967296 as the offset, they're going to get unexpected results otherwise.

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I prefer that as well but all other functions right now coerce the numbers to uint32. I will open a separate PR to change that for all functions.

const x1 = this.readUInt32BE(offset + 0, noAssert);
const x0 = this.readUInt32BE(offset + 4, noAssert);
return toDouble(x0, x1);
};


Buffer.prototype.readDoubleLE = function(offset, noAssert) {
offset = offset >>> 0;
const x0 = this.readUInt32LE(offset + 0, noAssert);
const x1 = this.readUInt32LE(offset + 4, noAssert);
return toDouble(x0, x1);
};


Buffer.prototype.readFloatBE = function(offset, noAssert) {
offset = offset >>> 0;
return toFloat(this.readUInt32BE(offset, noAssert));
};


Buffer.prototype.readFloatLE = function(offset, noAssert) {
offset = offset >>> 0;
return toFloat(this.readUInt32LE(offset, noAssert));
};

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197 changes: 98 additions & 99 deletions test/parallel/test-readdouble.js
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Expand Up @@ -29,102 +29,101 @@ const assert = require('assert');
/*
* Test (64 bit) double
*/
function test(clazz) {
const buffer = new clazz(8);

buffer[0] = 0x55;
buffer[1] = 0x55;
buffer[2] = 0x55;
buffer[3] = 0x55;
buffer[4] = 0x55;
buffer[5] = 0x55;
buffer[6] = 0xd5;
buffer[7] = 0x3f;
assert.strictEqual(1.1945305291680097e+103, buffer.readDoubleBE(0));
assert.strictEqual(0.3333333333333333, buffer.readDoubleLE(0));

buffer[0] = 1;
buffer[1] = 0;
buffer[2] = 0;
buffer[3] = 0;
buffer[4] = 0;
buffer[5] = 0;
buffer[6] = 0xf0;
buffer[7] = 0x3f;
assert.strictEqual(7.291122019655968e-304, buffer.readDoubleBE(0));
assert.strictEqual(1.0000000000000002, buffer.readDoubleLE(0));

buffer[0] = 2;
assert.strictEqual(4.778309726801735e-299, buffer.readDoubleBE(0));
assert.strictEqual(1.0000000000000004, buffer.readDoubleLE(0));

buffer[0] = 1;
buffer[6] = 0;
buffer[7] = 0;
assert.strictEqual(7.291122019556398e-304, buffer.readDoubleBE(0));
assert.strictEqual(5e-324, buffer.readDoubleLE(0));

buffer[0] = 0xff;
buffer[1] = 0xff;
buffer[2] = 0xff;
buffer[3] = 0xff;
buffer[4] = 0xff;
buffer[5] = 0xff;
buffer[6] = 0x0f;
buffer[7] = 0x00;
assert.ok(Number.isNaN(buffer.readDoubleBE(0)));
assert.strictEqual(2.225073858507201e-308, buffer.readDoubleLE(0));

buffer[6] = 0xef;
buffer[7] = 0x7f;
assert.ok(Number.isNaN(buffer.readDoubleBE(0)));
assert.strictEqual(1.7976931348623157e+308, buffer.readDoubleLE(0));

buffer[0] = 0;
buffer[1] = 0;
buffer[2] = 0;
buffer[3] = 0;
buffer[4] = 0;
buffer[5] = 0;
buffer[6] = 0xf0;
buffer[7] = 0x3f;
assert.strictEqual(3.03865e-319, buffer.readDoubleBE(0));
assert.strictEqual(1, buffer.readDoubleLE(0));

buffer[6] = 0;
buffer[7] = 0x40;
assert.strictEqual(3.16e-322, buffer.readDoubleBE(0));
assert.strictEqual(2, buffer.readDoubleLE(0));

buffer[7] = 0xc0;
assert.strictEqual(9.5e-322, buffer.readDoubleBE(0));
assert.strictEqual(-2, buffer.readDoubleLE(0));

buffer[6] = 0x10;
buffer[7] = 0;
assert.strictEqual(2.0237e-320, buffer.readDoubleBE(0));
assert.strictEqual(2.2250738585072014e-308, buffer.readDoubleLE(0));

buffer[6] = 0;
assert.strictEqual(0, buffer.readDoubleBE(0));
assert.strictEqual(0, buffer.readDoubleLE(0));
assert.strictEqual(false, 1 / buffer.readDoubleLE(0) < 0);

buffer[7] = 0x80;
assert.strictEqual(6.3e-322, buffer.readDoubleBE(0));
assert.strictEqual(-0, buffer.readDoubleLE(0));
assert.strictEqual(true, 1 / buffer.readDoubleLE(0) < 0);

buffer[6] = 0xf0;
buffer[7] = 0x7f;
assert.strictEqual(3.0418e-319, buffer.readDoubleBE(0));
assert.strictEqual(Infinity, buffer.readDoubleLE(0));

buffer[6] = 0xf0;
buffer[7] = 0xff;
assert.strictEqual(3.04814e-319, buffer.readDoubleBE(0));
assert.strictEqual(-Infinity, buffer.readDoubleLE(0));
}


test(Buffer);
const buffer = Buffer.allocUnsafe(8);

buffer[0] = 0x55;
buffer[1] = 0x55;
buffer[2] = 0x55;
buffer[3] = 0x55;
buffer[4] = 0x55;
buffer[5] = 0x55;
buffer[6] = 0xd5;
buffer[7] = 0x3f;
assert.strictEqual(1.1945305291680097e+103, buffer.readDoubleBE(0));
assert.strictEqual(0.3333333333333333, buffer.readDoubleLE(0));

buffer[0] = 1;
buffer[1] = 0;
buffer[2] = 0;
buffer[3] = 0;
buffer[4] = 0;
buffer[5] = 0;
buffer[6] = 0xf0;
buffer[7] = 0x3f;
assert.strictEqual(7.291122019655968e-304, buffer.readDoubleBE(0));
assert.strictEqual(1.0000000000000002, buffer.readDoubleLE(0));

buffer[0] = 2;
assert.strictEqual(4.778309726801735e-299, buffer.readDoubleBE(0));
assert.strictEqual(1.0000000000000004, buffer.readDoubleLE(0));

buffer[0] = 1;
buffer[6] = 0;
buffer[7] = 0;
assert.strictEqual(7.291122019556398e-304, buffer.readDoubleBE(0));
assert.strictEqual(5e-324, buffer.readDoubleLE(0));

buffer[0] = 0xff;
buffer[1] = 0xff;
buffer[2] = 0xff;
buffer[3] = 0xff;
buffer[4] = 0xff;
buffer[5] = 0xff;
buffer[6] = 0x0f;
buffer[7] = 0x00;
assert.ok(Number.isNaN(buffer.readDoubleBE(0)));
assert.strictEqual(2.225073858507201e-308, buffer.readDoubleLE(0));

buffer[6] = 0xef;
buffer[7] = 0x7f;
assert.ok(Number.isNaN(buffer.readDoubleBE(0)));
assert.strictEqual(1.7976931348623157e+308, buffer.readDoubleLE(0));

buffer[0] = 0;
buffer[1] = 0;
buffer[2] = 0;
buffer[3] = 0;
buffer[4] = 0;
buffer[5] = 0;
buffer[6] = 0xf0;
buffer[7] = 0x3f;
assert.strictEqual(3.03865e-319, buffer.readDoubleBE(0));
assert.strictEqual(1, buffer.readDoubleLE(0));

buffer[6] = 0;
buffer[7] = 0x40;
assert.strictEqual(3.16e-322, buffer.readDoubleBE(0));
assert.strictEqual(2, buffer.readDoubleLE(0));

buffer[7] = 0xc0;
assert.strictEqual(9.5e-322, buffer.readDoubleBE(0));
assert.strictEqual(-2, buffer.readDoubleLE(0));

buffer[6] = 0x10;
buffer[7] = 0;
assert.strictEqual(2.0237e-320, buffer.readDoubleBE(0));
assert.strictEqual(2.2250738585072014e-308, buffer.readDoubleLE(0));

buffer[6] = 0;
assert.strictEqual(0, buffer.readDoubleBE(0));
assert.strictEqual(0, buffer.readDoubleLE(0));
assert.strictEqual(false, 1 / buffer.readDoubleLE(0) < 0);

buffer[7] = 0x80;
assert.strictEqual(6.3e-322, buffer.readDoubleBE(0));
assert.strictEqual(-0, buffer.readDoubleLE(0));
assert.strictEqual(true, 1 / buffer.readDoubleLE(0) < 0);

buffer[6] = 0xf0;
buffer[7] = 0x7f;
assert.strictEqual(3.0418e-319, buffer.readDoubleBE(0));
assert.strictEqual(Infinity, buffer.readDoubleLE(0));

buffer[7] = 0xff;
assert.strictEqual(3.04814e-319, buffer.readDoubleBE(0));
assert.strictEqual(-Infinity, buffer.readDoubleLE(0));

buffer.writeDoubleBE(246800);
assert.strictEqual(buffer.readDoubleBE(), 246800);
assert.strictEqual(buffer.readDoubleBE(0.7), 246800);
assert.strictEqual(buffer.readDoubleBE(NaN), 246800);