Github user bodewig commented on a diff in the pull request: https://github.com/apache/commons-compress/pull/21#discussion_r112838584 --- Diff: src/main/java/org/apache/commons/compress/archivers/zip/ZipFile.java --- @@ -1111,14 +1122,11 @@ public int read() throws IOException { } return -1; } - synchronized (archive) { - archive.position(loc++); - int read = read(1); - if (read < 0) { - return read; - } - return buffer.get() & 0xff; + int read = read(loc++, 1); + if (read < 0) { --- End diff -- I think it depends on what we think `synchronized` is supposed to protect against. As it stands the `synchronized` block also protected concurrent reads from the same `BoundedInputStream` from overwriting their results (protecting `loc` and `buffer` not just the file position). If we want to keep that level of protection the changes are not going to work. If we say each input stream returned by `getInputStream` can only be used by a single thread, then I think it is fine to keep the increment outside of the block and only synchronise the code that protects the interaction between different streams.
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