Zlib.gunzip should not fail with non-ascii-8bit strings #55
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zstream_discard_input was encoding and character-aware when given input is user-provided, so this discards `len` chars instead of `len` bytes.
Also Zlib.gunzip explains in its rdoc that it is equivalent with the following code, but this doesn't fail for UTF-8 String.
```ruby
string = %w[1f8b0800c28000000003cb48cdc9c9070086a6103605000000].pack("H*").force_encoding('UTF-8')
sio = StringIO.new(string)
gz = Zlib::GzipReader.new(sio, encoding: Encoding::ASCII_8BIT)
p gz.read
gz&.close
```
Reported and discovered by eagletmt at https://twitter.com/eagletmt/status/1689692467929694209
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Aug 10, 2023
(ruby/zlib#55) zstream_discard_input was encoding and character-aware when given input is user-provided, so this discards `len` chars instead of `len` bytes. Also Zlib.gunzip explains in its rdoc that it is equivalent with the following code, but this doesn't fail for UTF-8 String. ```ruby string = %w[1f8b0800c28000000003cb48cdc9c9070086a6103605000000].pack("H*").force_encoding('UTF-8') sio = StringIO.new(string) p gz.read #=> "hello" gz&.close p Zlib.gunzip(string) #=> Zlib::DataError ``` Reported and discovered by eagletmt at https://twitter.com/eagletmt/status/1689692467929694209 ruby/zlib@c5e58bc62a
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zstream_discard_input was encoding and character-aware when given input is user-provided, so this discards
lenchars instead oflenbytes.Also Zlib.gunzip explains in its rdoc that it is equivalent with the following code, but this doesn't fail for UTF-8 String.
Reported and discovered by @eagletmt at https://twitter.com/eagletmt/status/1689692467929694209