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Denis Knauf 2020-04-29 21:20:41 +02:00
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.gitignore vendored Normal file
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/.bundle/
/.yardoc
/_yardoc/
/coverage/
/doc/
/pkg/
/spec/reports/
/tmp/

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Gemfile Normal file
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source "https://rubygems.org"
# Specify your gem's dependencies in iounpack.gemspec
gemspec
gem "rake", "~> 12.0"

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LICENSE.txt Normal file
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GNU LESSER GENERAL PUBLIC LICENSE
Version 3, 29 June 2007
Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
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README.md Normal file
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# Iounpack
Provides IO#unpack.
## Installation
Add this line to your application's Gemfile:
```ruby
gem 'iounpack'
```
And then execute:
$ bundle install
Or install it yourself as:
$ gem install iounpack
## Usage
io = File.open '/etc/fstab'
io.unpack( 'n4 a n4 a30')
# =>
## Development
## Contributing
Bug reports and pull requests are welcome on git at https://git.denkn.at/deac/iounpack.

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Rakefile Normal file
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require "bundler/gem_tasks"
task :default => :spec

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iounpack.gemspec Normal file
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require_relative 'lib/iounpack/version'
Gem::Specification.new do |spec|
spec.name = "iounpack"
spec.version = Iounpack::VERSION
spec.authors = ["Denis Knauf"]
spec.email = ["git+iounpack@denkn.at"]
spec.licenses = ["LGPL-3.0"]
spec.summary = %q{Provides IO#unpack and IO#unpack1}
spec.description = %q{#unpack works as opposide to pack. It determines length to read for unpacking.}
spec.homepage = "https://git.denkn.at/deac/iounpack"
spec.required_ruby_version = Gem::Requirement.new(">= 2.3.0")
#spec.metadata["allowed_push_host"] = "TODO: Set to 'http://mygemserver.com'"
spec.metadata["homepage_uri"] = spec.homepage
spec.metadata["source_code_uri"] = spec.homepage
spec.metadata["changelog_uri"] = spec.homepage
# Specify which files should be added to the gem when it is released.
# The `git ls-files -z` loads the files in the RubyGem that have been added into git.
spec.files = Dir.chdir(File.expand_path('..', __FILE__)) do
`git ls-files -z`.split("\x0").reject { |f| f.match(%r{^(test|spec|features)/}) }
end
spec.bindir = "bin"
spec.executables = spec.files.grep(%r{^bin/}) { |f| File.basename(f) }
spec.require_paths = ["lib"]
end

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require "iounpack/version"
class String
def unpack1 *a
unpack( *a).first
end unless instance_methods.include? :unpack1
end
class IOUnpack
class Directive < Struct.new( :directive, :returns, :bytelen)
def * repeat
if bytelen.respond_to? :call
bytelen[ repeat]
else
bytelen * repeat
end
end
end
directives = [
Directive.new( :C, Integer, 1),
Directive.new( :S, Integer, 2), Directive.new( :S_, Integer, 2), Directive.new( 'S!', Integer, 2),
Directive.new( :L, Integer, 4), Directive.new( :L_, Integer, 4), Directive.new( 'L!', Integer, 4),
Directive.new( :Q, Integer, 8), Directive.new( :Q_, Integer, 8), Directive.new( 'Q!', Integer, 8),
Directive.new( :c, Integer, 1),
Directive.new( :s, Integer, 2), Directive.new( :s_, Integer, 2), Directive.new( 's!', Integer, 2),
Directive.new( :l, Integer, 4), Directive.new( :l_, Integer, 4), Directive.new( 'l!', Integer, 4),
Directive.new( :q, Integer, 8), Directive.new( :q_, Integer, 8), Directive.new( 'q!', Integer, 8),
Directive.new( 'S<', Integer, 2), Directive.new( 'S!<', Integer, 2),
Directive.new( 'L<', Integer, 4), Directive.new( 'L!<', Integer, 4),
Directive.new( 'Q<', Integer, 8), Directive.new( 'Q!<', Integer, 8),
Directive.new( 's<', Integer, 2), Directive.new( 's!<', Integer, 2),
Directive.new( 'l<', Integer, 4), Directive.new( 'l!<', Integer, 4),
Directive.new( 'q<', Integer, 8), Directive.new( 'q!<', Integer, 8),
Directive.new( 'S>', Integer, 2), Directive.new( 'S!>', Integer, 2),
Directive.new( 'L>', Integer, 4), Directive.new( 'L!>', Integer, 4),
Directive.new( 'Q>', Integer, 8), Directive.new( 'Q!>', Integer, 8),
Directive.new( 's>', Integer, 2), Directive.new( 's!>', Integer, 2),
Directive.new( 'l>', Integer, 4), Directive.new( 'l!>', Integer, 4),
Directive.new( 'q>', Integer, 8), Directive.new( 'q!>', Integer, 8),
Directive.new( :n, Integer, 2), Directive.new( :N, Integer, 4),
Directive.new( :v, Integer, 2), Directive.new( :V, Integer, 4),
Directive.new( :D, Float, 8), Directive.new( :d, Float, 8),
Directive.new( :F, Float, 8), Directive.new( :f, Float, 8),
Directive.new( :E, Float, 8),
Directive.new( :e, Float, 4),
Directive.new( :G, Float, 8),
Directive.new( :g, Float, 4),
Directive.new( :A, String, 1),
Directive.new( :a, String, 1),
Directive.new( :Z, String, 1),
Directive.new( :B, String, lambda {|dir, repeat| (repeat/8.0).ceil}),
Directive.new( :b, String, lambda {|dir, repeat| (repeat/8.0).ceil}),
Directive.new( :H, String, lambda {|dir, repeat| (repeat/2.0).ceil}),
Directive.new( :h, String, lambda {|dir, repeat| (repeat/2.0).ceil}),
Directive.new( :x, nil, 1),
]
Directives = {}
DirectivePattern = '(?:'+
directives.map do |dir|
Directives[dir.directive.to_s] = dir
Regexp.quote dir.directive
end.join( '|')+')'
DirectiveRegexp = /\A\s* (?<directive> #{DirectivePattern} ) \s* (?<count> \d+)? \s*/m
def initialize pattern
@order, @len, @pattern = [], 0, pattern
loop do
case pattern
when /\A\s*\z/m then break
when DirectiveRegexp
pattern = $'
m = [Directives[$~[:directive]], $~[:count] ? $~[:count].to_i : 1]
@order.push m
@len += m.first * m.last
else
raise ArgumentError, "Unknown token: #{pattern[0]}"
end
end
end
def unpack io
io.read( @len).unpack @pattern
end
def unpack1 io
io.read( @len).unpack1 @pattern
end
end
class IO
def unpack pattern
IOUnpack.new( pattern).unpack self
end unless instance_methods.include? :unpack
def unpack1 pattern
IOUnpack.new( pattern).unpack1 self
end unless instance_methods.include? :unpack1
end

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module Iounpack
VERSION = "0.1.0"
end