module PDUTools::Helpers
Constants
- GSM_03_38_ESCAPES
Public Instance Methods
dec2hexbyte(dec)
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# File lib/pdu_tools/helpers.rb, line 33 def dec2hexbyte dec "%02X" % dec end
decode16bit(data, length)
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Decodes 16bit UTF-16 string into UTF-8 string
# File lib/pdu_tools/helpers.rb, line 118 def decode16bit data, length data.split('').in_groups_of(4).collect() double_octets = data.split('').in_groups_of(4).map(&:join).map{|x| x.to_i(16) }[0, length / 2] # integer values double_octets.collect do |o| [o].pack('S') end.join.force_encoding('utf-16le').encode('utf-8') end
decode7bit(textdata, length = nil, offset = 1)
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# File lib/pdu_tools/helpers.rb, line 76 def decode7bit textdata, length = nil, offset = 1 ret = "" bytes = [] textdata.split('').each_slice(2) do |s| bytes << "%08b" % s.join.to_i(16) end cur_septet = "" next_septet = "" last_char = "" bytes.each_with_index do |byte, index| to_take = ([0,1].include? offset) ? 7 : 8-offset cur_septet.prepend byte[offset, to_take] next_septet = byte[0,offset] if offset > 0 ret << cur_septet.to_i(2).chr if offset == 7 offset = 1 ret << next_septet.to_i(2).chr cur_septet = "" else offset += 1 cur_septet = next_septet end next_septet = nil end if length ret[0..length - 1] else ret end end
decode8bit(data, length)
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# File lib/pdu_tools/helpers.rb, line 110 def decode8bit data, length octets = data.split('').in_groups_of(2).collect(&:join)[0, length] octets.collect do |o| o.to_i(16).chr end.join end
encode7bit(string, padding=0)
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# File lib/pdu_tools/helpers.rb, line 37 def encode7bit string, padding=0 current_byte = 0 offset = padding packed = [] string.chars.to_a.each_with_index do |char, i| # cap off any excess bytes septet = char.ord & 0x7F # append the septet and then cap off excess bytes current_byte |= (septet << offset) & 0xFF offset += 7 if offset > 7 # the current byte is full, add it to the encoded data. packed << current_byte # shift left and append the left shifted septet to the current byte septet = septet >> (7 - (offset - 8 )) current_byte = septet # update offset offset -= 8 end end packed << current_byte if offset > 0 # append the last byte packed.collect{|c| "%02X" % c }.join end
encode8bit(string)
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# File lib/pdu_tools/helpers.rb, line 61 def encode8bit string string.chars.to_a.collect do |char| "%04X" % char.ord end.join end
gsm0338_to_utf8(string)
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# File lib/pdu_tools/helpers.rb, line 25 def gsm0338_to_utf8 string GSM_03_38_ESCAPES.each do |replace, find| string.gsub! find, replace end string end
normal2swapped(string)
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# File lib/pdu_tools/helpers.rb, line 67 def normal2swapped string string << "F" if string.length.odd? string.scan(/../).collect(&:reverse).join end
swapped2normal(string)
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# File lib/pdu_tools/helpers.rb, line 72 def swapped2normal string string.scan(/../).collect(&:reverse).join.gsub(/F$/,'') end
utf8_to_gsm0338(string)
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# File lib/pdu_tools/helpers.rb, line 18 def utf8_to_gsm0338 string GSM_03_38_ESCAPES.each do |find, replace| string.gsub! find, replace end string end