Class: Xbd::Asi

Inherits:
Object
  • Object
show all
Defined in:
lib/xbd/asi.rb

Overview

********************************* Xbd::Asi module *********************************

Read and Generate ASI strings

Defined Under Namespace

Modules: Bignum, Fixnum, IO, String

Constant Summary collapse

ASI_INSTANCE = 
Asi.new

Class Method Summary collapse

Instance Method Summary collapse

Class Method Details

.asi_length(num) ⇒ Object 



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# File 'lib/xbd/asi.rb', line 96

def Asi.asi_length(num)
  count=1
  while num>=0x80
    num>>=7
    count+=1
  end
  count
end

.asi_to_i(source) ⇒ Object 



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# File 'lib/xbd/asi.rb', line 49

def Asi.asi_to_i(source)
  Asi.read_asi(source,0)[0]
end

.i_to_asi2(num) ⇒ Object 



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# File 'lib/xbd/asi.rb', line 78

def Asi.i_to_asi2(num)
  ASI_INSTANCE.i_to_asi_c(num)
end

.i_to_asi_ruby(num) ⇒ Object Also known as: i_to_asi 



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# File 'lib/xbd/asi.rb', line 82

def Asi.i_to_asi_ruby(num)
  ret=""
  while ret.length==0 || num>0
    val=num & 0x7F;
    num=num>>7
    val|=0x80 if num>0
    ret<<val
  end
  ret
end

.read_asi(source, index = 0) ⇒ Object

read an ASI from a string, returning an integer optionally starts and the specified offset index.

returns the number read and the first index after the ASI data in the string.



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# File 'lib/xbd/asi.rb', line 18

def Asi.read_asi(source,index=0)
  ret=0
  shift=0
  val=0
  while index<source.length
    val=source.byte(index)
    ret+= (val & 0x7F) << shift;
    shift+=7
    index+=1
    break if val<128
  end
  return ret,index
end

.read_asi_from_file(file) ⇒ Object 



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# File 'lib/xbd/asi.rb', line 37

def Asi.read_asi_from_file(file)
  ret=0
  shift=0
  val=0
  while val=file.readbyte
    ret+= (val & 0x7F) << shift;
    shift+=7
    break if val<128
  end
  return ret
end

.read_asi_string(source, index = 0) ⇒ Object 



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# File 'lib/xbd/asi.rb', line 32

def Asi.read_asi_string(source,index=0)
  n,index=read_asi(source,index)
  return source[index,n],index+n
end

Instance Method Details

#i_to_asi_c(num) ⇒ Object 



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# File 'lib/xbd/asi.rb', line 72

def i_to_asi_c(num)
  Asi.i_to_asi_ruby(num)
end