Read with len = 0 should return 0 bytes read.

[fuatbasik]

Analytics Accelerator Library for Amazon S3 Version

0.0.1, 0.0.2

AWS Region

us-east-1

Describe the running environment

Running in EC2 instance and mac.

What happened?

According to InputStream specification, when reader tries to read 0 bytes, read method should return 0 bytes read, independent of the object size.
See:

If len is zero, then no bytes are read and 0 is returned; otherwise, there is an attempt to read at least one byte. If no byte is available because the stream is at end of file, the value -1 is returned; otherwise, at least one byte is read and stored into b.

In S3SeekableInputStream for an 0-sized object implementation of the read method will return -1.

https://github.com/awslabs/analytics-accelerator-s3/blob/main/input-stream/src/main/java/software/amazon/s3/analyticsaccelerator/S3SeekableInputStream.java#L135-L153

Relevant log output

No response

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