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* [ruby-core:119537] [Ruby master Bug#20802] It is possible to set the encoding of an IO instance to one that requires binmode when binmode is not set
@ 2024-10-21  8:50 javanthropus (Jeremy Bopp) via ruby-core
  0 siblings, 0 replies; only message in thread
From: javanthropus (Jeremy Bopp) via ruby-core @ 2024-10-21  8:50 UTC (permalink / raw)
  To: ruby-core; +Cc: javanthropus (Jeremy Bopp)

Issue #20802 has been reported by javanthropus (Jeremy Bopp).

----------------------------------------
Bug #20802: It is possible to set the encoding of an IO instance to one that requires binmode when binmode is not set
https://bugs.ruby-lang.org/issues/20802

* Author: javanthropus (Jeremy Bopp)
* Status: Open
* ruby -v: ruby 3.3.4 (2024-07-09 revision be1089c8ec) [x86_64-linux]
* Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN
----------------------------------------
I don't know what problems this may cause, but there are guards against setting the encoding of an IO instance to one such as UTF-16LE when the IO instance is not set to binary mode.  Here is a method to bypass those guards:
```ruby
f1 = File.open('/dev/null')
f2 = File.open('/dev/null')
f1.binmode
f1.set_encoding('utf-16le')
f2.set_encoding('utf-8')
f1.reopen(f2)

f1.binmode?            # <= false
f1.external_encoding   # <= Encoding::UTF_16LE
```



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2024-10-21  8:50 [ruby-core:119537] [Ruby master Bug#20802] It is possible to set the encoding of an IO instance to one that requires binmode when binmode is not set javanthropus (Jeremy Bopp) via ruby-core

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