[jira] [Created] (DERBY-7143) HarmonySerialBlob.getBinaryStream(long, long) makes it impossible to retrieve the last character of the Blob.

["Ben (Jira)" <ji...@apache.org>]

Ben created DERBY-7143:
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             Summary: HarmonySerialBlob.getBinaryStream(long, long) makes it impossible to retrieve the last character of the Blob.
                 Key: DERBY-7143
                 URL: https://issues.apache.org/jira/browse/DERBY-7143
             Project: Derby
          Issue Type: Bug
          Components: Network Client, SQL
    Affects Versions: 10.15.2.0
            Reporter: Ben


As far as I understand it, the method HarmonySerialBlob.getBinaryStream(long, long) takes two arguments <pos> and <length> and is supposed to produce a ByteArrayInputStream() with a substring of the Blob's Contents that starts at <pos> and has length <length>.

Unfortunately, the error handling in this method makes it impossible to retrieve the Blob's entire contents as the last character is always missing.

In detail:
When calling this method with <pos>=0, then it raises the SQLException XJ087. Hence, <pos> must always be > 0.
When calling this method with <pos>=1 and <length>=blob.length(), then it also raises the SQLException, because pos+length > blob.length(). Hence, <length> can at most be set to blob.length()-1.

When calling this method with <pos>=1 and <length>=blob.length()-1, then it gives a ByteArrayInputStream which is missing the last character from the blob.

The fact that the last character is missing makes sense, when <length> is set to blob.length()-1.

But it does not make sense to prohibit setting <length>=blob.length() when this is the only way to include the last character in the ByteArrayInputStream.



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