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src: fix slice of slice of file-backed Blob #53972

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Merged
merged 1 commit into from
Jul 22, 2024
Merged

src: fix slice of slice of file-backed Blob #53972

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6 changes: 4 additions & 2 deletions src/dataqueue/queue.cc
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Original file line number Diff line number Diff line change
Expand Up @@ -840,7 +840,9 @@ class FdEntry final : public EntryImpl {
path_(std::move(path_)),
stat_(stat),
start_(start),
end_(end) {}
end_(end) {
CHECK_LE(start, end);
}

std::shared_ptr<DataQueue::Reader> get_reader() override {
return ReaderImpl::Create(this);
Expand All @@ -851,7 +853,7 @@ class FdEntry final : public EntryImpl {
uint64_t new_start = start_ + start;
uint64_t new_end = end_;
if (end.has_value()) {
new_end = std::min(end.value(), end_);
new_end = std::min(end.value() + start_, end_);
}

CHECK(new_start >= start_);
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10 changes: 10 additions & 0 deletions test/parallel/test-blob-file-backed.js
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Original file line number Diff line number Diff line change
Expand Up @@ -86,6 +86,16 @@ writeFileSync(testfile5, '');

const res1 = blob.slice(995, 1005);
strictEqual(await res1.text(), data.slice(995, 1005));

// Refs: https://github.com/nodejs/node/issues/53908
for (const res2 of [
blob.slice(995, 1005).slice(),
blob.slice(995).slice(0, 10),
blob.slice(0, 1005).slice(995),
]) {
strictEqual(await res2.text(), data.slice(995, 1005));
}

await unlink(testfile2);
})().then(common.mustCall());

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