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`fs.openAsBlob()` does not work properly for files > 2GB
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上游 issue 正文
### Version
v21.7.3 (and v20.12.2)
### Platform
Darwin bender.local 23.4.0 Darwin Kernel Version 23.4.0: Fri Mar 15 00:10:42 PDT 2024; root:xnu-10063.101.17~1/RELEASE_ARM64_T6000 arm64
### Subsystem
fs
### What steps will reproduce the bug?
Steps to reproduce bug:
1. Generate a 3 GB file with `dd if=/dev/random of=random.bin bs=1048576 count=3072`
2. Launch node (v21.7.3 and v20.12.2 both repro for me)
3. `const b = await fs.openAsBlob("random.bin")`
4. `b.slice(2**31-2, 2**31-1)` <-- works
5. `b.slice(2**31-1, 2**31)` <-- returns a slice of zero length
6. `b.slice(2**31, 2**31+1)` <-- crashes
Full textual output of doing this given below.
Also, for files greater than 4GB, the size of the blob is wrong. It appears to be exactly `4*(2**30)` less than the actual size. For example, for a `5*(2**30)` byte file, the blob size is reported as `1073741824`, which is `(2**30)`. And, for a file that is exactly `4*(2**30)`, it reports a size of zero.
### How often does it reproduce? Is there a required condition?
Always reproduces.
### What is the expected behavior? Why is that the expected behavior?
Can operate on the Blob normally.
### What do you see instead?
Described above. See output below.
### Additional information
```console
$ dd if=/dev/random of=random.bin bs=1048576 count=3072
3072+0 records in
3072+0 records out
3221225472 bytes transferred in 4.213743 secs (764457033 bytes/sec)
$ ls -l random.bin
-rw-r--r-- 1 jbrandt staff 3221225472 Apr 18 15:04 random.bin
$ node -v
v21.7.3
$ node
Welcome to Node.js v21.7.3.
Type ".help" for more information.
> const b = await fs.openAsBlob("random.bin")
undefined
> b
Blob { size: 3221225472, type: '' }
> b.slice(2**31-2, 2**31-1)
Blob { size: 1, type: '' }
> b.slice(2**31-1, 2**31)
Blob { size: 0, type: '' }
> b.slice(2**31, 2**31+1)
# node[96070]: static void node::Blob::ToSlice(const FunctionCallbackInfo<v8::Value> &) at ../src/node_blob.cc:247
# Assertion failed: args[0]->IsUint32()
----- Native stack trace -----
1…
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