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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