Module: PhpUnpack

Defined in:
lib/ruby-common/common/PhpUnpack.rb

Constant Summary collapse

NAME = 
"name"
CODE = 
"code"

Class Method Summary collapse

Class Method Details

.decode(input, code) ⇒ Object 



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# File 'lib/ruby-common/common/PhpUnpack.rb', line 28

def self.decode(input, code)
  case code
  when 'c'
    decoded_data = input.unpack('c')
    bytes_offset = 1
  when 'C'
    decoded_data = input.unpack('C')
    bytes_offset = 1
  when 'n'
    decoded_data = input.unpack('n')
    bytes_offset = 2
  when 'N'
    decoded_data = input.unpack('N')
    bytes_offset = 4
  when 'J'
    decoded_data = input.unpack1('Q>')
    bytes_offset = 8
  when 'v'
    decoded_data = input.unpack('v')
    bytes_offset = 2
  else
    raise ArgumentError, "Unrecognized instruction: #{code}"
  end

  [decoded_data, bytes_offset]
end

.encode(input, code) ⇒ Object 



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# File 'lib/ruby-common/common/PhpUnpack.rb', line 68

def self.encode(input, code)
  case code
  when 'c'
    [input.to_i].pack('c')
  when 'C'
    [input.to_i].pack('C')
  when 'n'
    [input.to_i].pack('n')
  when 'N'
    [input.to_i].pack('N')
  when 'J'
    [input.to_i].pack('J')
  when 'v'
    [input.to_i].pack('v')
  else
    raise ArgumentError, "Unrecognized instruction: #{code}"
  end
end

.pack(format, *inputs) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/ruby-common/common/PhpUnpack.rb', line 55

def self.pack(format, *inputs)
  instructions = format.split('')
  raise ArgumentError, "Invalid format length, expected #{inputs.length} number of codes" unless instructions.length == inputs.length

  buffer = StringIO.new
  instructions.each_with_index do |code, i|
    encoded_data = encode(inputs[i], code)
    buffer.write(encoded_data)
  end

  buffer.string
end

.unpack(format, input, byte_slice = true) ⇒ Object 



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# File 'lib/ruby-common/common/PhpUnpack.rb', line 7

def self.unpack(format, input, byte_slice = true)
  instructions = format.split('/')
  offset = 0
  result = {}

  instructions.each do |instruction|
    code_and_name = get_code_and_name(instruction)
    code = code_and_name[CODE]
    name = code_and_name[NAME]

    decoded_data, bytes_offset = decode(input, code)
    result[name] = decoded_data
    offset = offset + bytes_offset
    
    if byte_slice
      input.slice!(0, bytes_offset)
    end
  end
  result
end