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require 'enumerator'
class CStruct
module Utils #:nodoc: all
UnpackFormat =
{
:little => { 1=>'C',2=>'v',4=>'V',8=>'Q',:float=>'e',:double=>'E'},
:big => { 1=>'C',2=>'n',4=>'N',8=>'Q',:float=>'g',:double=>'G'}, #8=>'Q'? 'Q' is native endian
}
SigedMaxValue = { 1 => 0x7F, 2 => 0x7FFF, 4 => 0x7FFFFFFF, 8 => 0x7FFFFFFFFFFFFFFF }
UnsigedMaxValue = { 1 => 0xFF, 2 => 0xFFFF, 4 => 0xFFFFFFFF, 8 => 0xFFFFFFFFFFFFFFFF }
class << self
# buffer is a String's object
def unpack(buffer,struct_endian,fsize,fsign)
format_index = (fsign==:float or fsign ==:double) ? (fsign):(fsize)
format = UnpackFormat[struct_endian][format_index]
value = buffer.unpack(format).first
if fsign == :signed
value = unsigned_to_signed value,fsize
end
value
end
# buffer is a Array's object
def pack(buffer,struct_endian,fsize,fsign)
format_index = (fsign==:float or fsign ==:double) ? (fsign):(fsize)
format = UnpackFormat[struct_endian][format_index]
buffer.pack format
end
def string_setbyte(string,index,value)
RUBY_VERSION < "1.9" ? (string[index] = value):(string.setbyte index,value)
end
def string_getbyte(string,index)
RUBY_VERSION < "1.9" ? (string[index]):(string.getbyte index)
end
def unsigned_to_signed(value,value_size)
value > SigedMaxValue[value_size] ? (value - UnsigedMaxValue[value_size]-1):(value)
end
def buffer_setbytes(target,source,target_index)
source.enum_for(:each_byte).each_with_index do |byte,index|
string_setbyte(target,target_index + index,byte)
end
end
end
end
end
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