v8: fix offsets for TypedArray deserialization #12143
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Fix the offset calculation for deserializing TypedArrays that are not aligned in their original buffer. Since `byteOffset` refers to the offset into the source `Buffer` instance, not its underlying `ArrayBuffer`, that is what should be passed to `buffer.copy`.
addaleax
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bnoordhuis
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Mar 31, 2017
test/parallel/test-v8-serdes.js
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| { | ||
| // Unaligned Uint16Array read, with padding in the underlying array buffer. | ||
| const buf = Buffer.from('0'.repeat(64) + 'ff0d5c0404addeefbe', 'hex') | ||
| .slice(32); |
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Is the idea here to create a buffer with a byteOffset > 0? An IMO more reliable and future-proof way is this:
let buf = Buffer.alloc(32 + 9); // Hope I counted the bytes right!
buf.write('0'.repeat(64) + 'ff0d5c0404addeefbe', 'hex');
buf = buf.slice(32);
assert.strictEqual(buf.byteOffset, 32); // Deterministic byte offset, unlike Buffer.from().slice()
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@bnoordhuis Yes, that’s the idea. I’ve updated the test with a variant of your suggestion
bnoordhuis
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Mar 31, 2017
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OS X turned this up, not sure if it's related or not. |
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I think the V8 upgrade has made that test flaky. I've seen it fail with other pull requests too. |
jasnell
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Mar 31, 2017
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Landed in 33a19b4 |
addaleax
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Fix the offset calculation for deserializing TypedArrays that are not aligned in their original buffer. Since `byteOffset` refers to the offset into the source `Buffer` instance, not its underlying `ArrayBuffer`, that is what should be passed to `buffer.copy`. PR-URL: #12143 Reviewed-By: Ben Noordhuis <info@bnoordhuis.nl> Reviewed-By: James M Snell <jasnell@gmail.com>
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The test does not pass on some (big endian?) platforms: https://ci.nodejs.org/job/node-test-commit/8806/ |
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@targos eep, I should not have missed that … PR coming in a second |
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addaleax
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Ref: #12143 (comment) PR-URL: #12186 Reviewed-By: Gibson Fahnestock <gibfahn@gmail.com> Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com> Reviewed-By: Michaël Zasso <targos@protonmail.com> Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
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Fix the offset calculation for deserializing TypedArrays that are
not aligned in their original buffer.
Since
byteOffsetrefers to the offset into the sourceBufferinstance, not its underlying
ArrayBuffer, that is what shouldbe passed to
buffer.copy.Checklist
make -j4 test(UNIX), orvcbuild test(Windows) passesAffected core subsystem(s)
v8