Class: Ariblib::BitStream

Inherits:
Object
  • Object
show all
Defined in:
lib/ariblib/BitStream.rb

Overview

ビットストリーム

Instance Method Summary collapse

Constructor Details

#initialize(buf) ⇒ BitStream

Returns a new instance of BitStream.



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# File 'lib/ariblib/BitStream.rb', line 8

def initialize(buf)
  @bitstream_buffer=buf||("".encode("BINARY"))
  @bitstream_postion=0
end

Instance Method Details

#buf ⇒ Object 



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# File 'lib/ariblib/BitStream.rb', line 55

def buf
  @bitstream_buffer
end

#buf=(a) ⇒ Object 



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# File 'lib/ariblib/BitStream.rb', line 58

def buf=(a)
  @bitstream_buffer=a
end

#get3 ⇒ Object 



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# File 'lib/ariblib/BitStream.rb', line 30

def get3
  len=@bitstream_postion/8
  @bitstream_postion+=8*3
  ret =@bitstream_buffer.getbyte(len  ) << 16
  ret|=@bitstream_buffer.getbyte(len+1) <<  8
  ret|=@bitstream_buffer.getbyte(len+2)
  ret
end

#getc ⇒ Object 



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# File 'lib/ariblib/BitStream.rb', line 17

def getc
  len=@bitstream_postion/8
  @bitstream_postion+=8
  ret =@bitstream_buffer.getbyte(len  )
  ret
end

#gets ⇒ Object 



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# File 'lib/ariblib/BitStream.rb', line 23

def gets
  len=@bitstream_postion/8
  @bitstream_postion+=8*2
  ret =@bitstream_buffer.getbyte(len  ) <<  8
  ret|=@bitstream_buffer.getbyte(len+1)
  ret
end

#lest ⇒ Object 



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# File 'lib/ariblib/BitStream.rb', line 52

def lest
  @bitstream_buffer.size*8-@bitstream_postion
end

#pos ⇒ Object 



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# File 'lib/ariblib/BitStream.rb', line 61

def pos
  @bitstream_postion
end

#pos=(a) ⇒ Object 



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# File 'lib/ariblib/BitStream.rb', line 64

def pos=(a)
  @bitstream_postion=a
end

#read(size) ⇒ Object 



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# File 'lib/ariblib/BitStream.rb', line 38

def read(size)
  pos =@bitstream_postion>>3
  modd=@bitstream_postion&0x07
  @bitstream_postion+=size
  mod =((~(@bitstream_postion)).succ)&0x07
  poss=((size+modd+7)>>3)
  tmp=0
  poss.times do |i|
    tmp<<=8
    tmp|=@bitstream_buffer.getbyte(pos+i)
  end
  tmpd = (tmp>>mod) & ((1<<size)-1)
  return tmpd
end

#str(byte) ⇒ Object 



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# File 'lib/ariblib/BitStream.rb', line 12

def str(byte)
    ret=@bitstream_buffer.byteslice(@bitstream_postion/8,byte)
    @bitstream_postion+=byte*8
    ret
end