Module: Pliney::IOHelpers

Included in:
IO, StringStream
Defined in:
lib/pliney/io_helpers.rb

Defined Under Namespace

Classes: StrictReadError

Instance Method Summary collapse

Instance Method Details

#read_uint16be ⇒ Object Also known as: read_uint16 



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# File 'lib/pliney/io_helpers.rb', line 24

def read_uint16be
    strictread(2).unpack("n").first
end

#read_uint16le ⇒ Object 



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# File 'lib/pliney/io_helpers.rb', line 41

def read_uint16le
    strictread(2).unpack("v").first
end

#read_uint32be ⇒ Object Also known as: read_uint32 



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# File 'lib/pliney/io_helpers.rb', line 28

def read_uint32be
    strictread(4).unpack("N").first
end

#read_uint32le ⇒ Object 



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# File 'lib/pliney/io_helpers.rb', line 45

def read_uint32le
    strictread(4).unpack("V").first
end

#read_uint64be ⇒ Object Also known as: read_uint64 



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# File 'lib/pliney/io_helpers.rb', line 32

def read_uint64be
    v = strictread(8).unpack("NN")
    (v[0] << 32) | v[1]
end

#read_uint64le ⇒ Object 



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# File 'lib/pliney/io_helpers.rb', line 49

def read_uint64le
    v = strictread(8).unpack("VV")
    (v[1] << 32) | v[0]
end

#read_uint8 ⇒ Object 



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# File 'lib/pliney/io_helpers.rb', line 20

def read_uint8
    getbyte
end

#strictread(nbytes) ⇒ Object 



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# File 'lib/pliney/io_helpers.rb', line 8

def strictread(nbytes)
    _pos = self.pos
    res = read(nbytes)
    if res.nil?
        raise(StrictReadError, "read returned nil for read(#{nbytes}) at offset #{_pos}")
    end
    if res.bytesize != nbytes
        raise(StrictReadError, "read returned only #{res.size} bytes for read(#{nbytes}) at offset #{_pos}")
    end
    return res
end