[Rev 01] RFR: 6651: Exposing the magic bytes for the compressed formats supported

[Marcus Hirt]

> Sometimes you have a stream from elsewhere, and need to do some custom magic.

The pull request has been updated with 1 additional commit.

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Added commits:
 - 3b594fa4: Making spotless happy

Changes:
  - all: https://git.openjdk.java.net/jmc/pull/13/files
  - new: https://git.openjdk.java.net/jmc/pull/13/files/974055b9..3b594fa4

Webrevs:
 - full: https://webrevs.openjdk.java.net/jmc/13/webrev.01
 - incr: https://webrevs.openjdk.java.net/jmc/13/webrev.00-01

  Stats: 1 line in 1 file changed: 0 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/jmc/pull/13.diff
  Fetch: git fetch https://git.openjdk.java.net/jmc pull/13/head:pull/13

PR: https://git.openjdk.java.net/jmc/pull/13