Class: Overlook::ByteReader

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Defined in:
lib/overlook/byte_reader.rb

Overview

Reads bytes from a given IO object.

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(io) ⇒ ByteReader

Returns a new instance of ByteReader.



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# File 'lib/overlook/byte_reader.rb', line 10

def initialize(io)
  @io = io
end

Instance Attribute Details

#io ⇒ Object (readonly)

Returns the value of attribute io.



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# File 'lib/overlook/byte_reader.rb', line 8

def io
  @io
end

Instance Method Details

#byte ⇒ Object 



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# File 'lib/overlook/byte_reader.rb', line 38

def byte
  io.read(1).ord
end

#char ⇒ Object 



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# File 'lib/overlook/byte_reader.rb', line 42

def char
  byte.chr
end

#float ⇒ Object 



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# File 'lib/overlook/byte_reader.rb', line 34

def float
  @io.read(4).unpack('<e').first
end

#read_int64 ⇒ Object Also known as: int64 



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# File 'lib/overlook/byte_reader.rb', line 14

def read_int64
  io.read(8).unpack("C*").each_with_index.reduce(0) do |sum, (byte, index)|
    sum + byte * (256 ** index)
  end
end

#read_short ⇒ Object Also known as: short 



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# File 'lib/overlook/byte_reader.rb', line 21

def read_short
  io.read(2).unpack('S*').first
end

#seek(len, type = IO::SEEK_CUR) ⇒ Object 



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# File 'lib/overlook/byte_reader.rb', line 30

def seek(len, type = IO::SEEK_CUR)
  io.seek(len, type)
end

#signed_int16 ⇒ Object 



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# File 'lib/overlook/byte_reader.rb', line 50

def signed_int16
  io.read(2).unpack('<s*').first
end

#signed_int32 ⇒ Object 



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# File 'lib/overlook/byte_reader.rb', line 46

def signed_int32
  io.read(4).unpack('<l*').first
end

#string(len) ⇒ Object 



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# File 'lib/overlook/byte_reader.rb', line 26

def string(len)
  io.read(len)
end