dd4302ae9b
Previously we detected this by reading the first line of the file. However, "first line" is meaningless when dealing with binary files, but IO#readline will happily keep reading until it finds a newline character, which can result in some unnecessarily large buffers. Aside from the performance issue, this causes an additional problem under Ruby 1.9: trying to match the binary string against a pattern will raise ArgumentError (unless the binary string just happens to also be valid UTF-8, heh). Fix both issues: only read the first 1024 bytes, as no sane shebang will ever be that long, and use a plain read(), which returns an ASCII encoded string even on 1.9. Signed-off-by: Jack Nagel <jacknagel@gmail.com>
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