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https://issues.apache.org/jira/browse/IO-714?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gary D. Gregory resolved IO-714.
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Fix Version/s: 2.12.0
Resolution: Fixed
> ReaderInputStream does not call CharsetEncoder.flush(...)
> ---------------------------------------------------------
>
> Key: IO-714
> URL: https://issues.apache.org/jira/browse/IO-714
> Project: Commons IO
> Issue Type: Bug
> Components: Streams/Writers
> Affects Versions: 2.8.0
> Reporter: Marcono1234
> Priority: Major
> Fix For: 2.12.0
>
> Attachments:
> 0001-Fixed-ReaderInputStream-not-calling-CharsetEncoder.f.patch
>
> Time Spent: 1h
> Remaining Estimate: 0h
>
> As defined by the {{CharsetEncoder}}
> [documentation|https://docs.oracle.com/en/java/javase/11/docs/api/java.base/java/nio/charset/CharsetEncoder.html]
> the _encoding operation_ consists of:
> # (reset)
> # encode
> # flush
> However, {{org.apache.commons.io.input.ReaderInputStream}} does not call
> {{flush}}. This leads to incorrect results for charsets whose {{flush}}
> method appends additional bytes.
> Example:
> {code}
> // Charset whose CharsetEncoder.flush(...) puts bytes
> Charset charset = Charset.forName("Cp930");
> // \u0391: Causes CharsetEncoder.flush(...) to put additional bytes
> String s = "\u0391";
> byte[] expected = s.getBytes(charset);
> byte[] actual;
> try (InputStream in = new ReaderInputStream(new StringReader(s), charset)) {
> actual = IOUtils.toByteArray(in);
> }
> if (!Arrays.equals(expected, actual)) {
> throw new AssertionError("\n Expected: " + Arrays.toString(expected) +
> "\n Actual: " + Arrays.toString(actual));
> }
> {code}
> Also make sure to check the result of {{flush()}} because {{OVERFLOW}} as
> result is possible. In theory {{isError() == true}} might be possible as
> well, but I don't think any of charset implementations currently return that.
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