Class: Wiris::BaseCode

Inherits:
Object
  • Object
show all
Defined in:
lib/src-generic/BaseCode.rb

Instance Method Summary collapse

Constructor Details

#initialize(base) ⇒ BaseCode

Returns a new instance of BaseCode.



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# File 'lib/src-generic/BaseCode.rb', line 9

def initialize(base)
	@base = base
       @charSet = base.toString()
       n = base.length()
       @nbits = 0
       while(n>1)
           @nbits+=1
           n = n / 2
       end
end

Instance Method Details

#decodeBytes(b) ⇒ Object 



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# File 'lib/src-generic/BaseCode.rb', line 39

def decodeBytes(b)
    if @tbl.nil?
        initTable()
    end

    bitsize = b.length() * @nbits
    size = bitsize/8
    o = []
    buf = 0
    curbits = 0
    pin = 0
    pout = 0
     while (pout < size)
        while (curbits < 8)
            curbits += @nbits
            buf <<=  @nbits
            i = @tbl[b.get(pin)]
            pin+=1
            buf |= i
        end
        curbits -= 8
        o[pout] = ((buf >> curbits) & 0xFF)
        pout += 1;
    end

    return Bytes.ofData(o)
end

#encodeBytes(b) ⇒ Object 



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# File 'lib/src-generic/BaseCode.rb', line 67

def encodeBytes(b)
    bas = @base
    size = (b.length()*8)/@nbits
    o = []
    buf = 0
    curbits = 0
    mask = (1 << @nbits) -1
    pin = 0
    pout = 0
    while (pout < size)
        while (curbits < @nbits)
            curbits += 8
            buf <<= 8
            buf |= b.get(pin)
            pin +=1
        end
        curbits -= @nbits
        o[pout] = bas.get((buf >> curbits) & mask)
        pout+=1
    end
    if (curbits > 0)
        o[pout] = bas.get((buf << (@nbits - curbits)) & mask)
        pout +=1
    end
    return Bytes.ofData(o)
end

#initTable ⇒ Object 



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# File 'lib/src-generic/BaseCode.rb', line 20

def initTable()
    @tbl = []


    for i in 0..255
        @tbl[i] = -1
        i+=1
    end

    i = 0
    for i in 0..@base.length()
        if !@base.get(i).nil?
            @tbl[@base.get(i)] = i
        end
        i+=1
    end

end