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https://issues.apache.org/jira/browse/CODEC-130?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13231575#comment-13231575
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Thomas Neidhart edited comment on CODEC-130 at 3/16/12 8:26 PM:
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Imho the request for change has some merit.
When looking at the InflaterInputStream (which is also a derived
FilterInputStream), the skip method is implemented to skip uncompressed bytes
rather than compressed ones (aka from the underlying stream):
{noformat}
Skips specified number of bytes of uncompressed data.
{noformat}
was (Author: tn):
Imho the request for change has some merit.
If looking at the InflaterInputStream (which is also a derived
FilterInputStream), the skip method is implemented to skip uncompressed bytes:
{noformat}
Skips specified number of bytes of uncompressed data.
{noformat}
> 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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