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Date: Fri, 16 Mar 2012 20:31:47 +0000 (UTC)
From: "Gary D. Gregory (Commented) (JIRA)" <jira@apache.org>
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Subject: [jira] [Commented] (CODEC-130) Base64InputStream.skip skips
 underlying stream, not output
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    [ https://issues.apache.org/jira/browse/CODEC-130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13231595#comment-13231595 ] 

Gary D. Gregory commented on CODEC-130:
---------------------------------------

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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