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From "Gary D. Gregory (Updated) (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CODEC-130) Base64InputStream.skip skips underlying stream, not output
Date Fri, 16 Mar 2012 20:33:40 GMT

     [ https://issues.apache.org/jira/browse/CODEC-130?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Gary D. Gregory updated CODEC-130:
----------------------------------

    Comment: was deleted

(was: Hi TN,

Feel free to patch and unit test with sufficient code coverage.

Gary)
    
> Base64InputStream.skip skips underlying stream, not output
> ----------------------------------------------------------
>
>                 Key: CODEC-130
>                 URL: https://issues.apache.org/jira/browse/CODEC-130
>             Project: Commons Codec
>          Issue Type: Bug
>    Affects Versions: 1.5
>            Reporter: James Pickering
>            Priority: Minor
>         Attachments: base64snippet.java
>
>
> Base64InputStream.skip() skips within underlying stream, leading to unexpected behaviour.
> The following code will reproduce the issue:
> @Test
> public void testSkip() throws Throwable {
>     InputStream ins =
>             new ByteArrayInputStream("AAAA////".getBytes("ISO-8859-1"));//should decode
to {0, 0, 0, 255, 255, 255}
>     Base64InputStream instance = new Base64InputStream(ins);
>     assertEquals(3L, instance.skip(3L)); //should skip 3 decoded characters, or 4 encoded
characters
>     assertEquals(255, instance.read()); //Currently returns 3, as it is decoding "A/",
not "//" 
> }
> The following code, if added to Base64InputStream, or (BaseNCodecInputStream in the dev
build) would resolve the issue:
> @Override
> public long skip(long n) throws IOException {
>     //delegate to read()
>     long bytesRead = 0;
>     while ((bytesRead < n) && (read() != -1)) {
>         bytesRead++;
>     }
>     return bytesRead;
> }
> More efficient code may be possible.

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