`class ByteRange < Struct`

Inherits from: Struct

Represents one byte-range-spec or suffix-byte-range-spec.

Definitions

`def self.parse(value)`

Parse one byte range.

Signature

parameter　value　String: The byte range to parse.
returns　ByteRange: The parsed byte range.

Implementation

def self.parse(value)
	unless match = BYTE_RANGE.match(value)
		raise ParseError, "Invalid byte range: #{value.inspect}"
	end
	
	if suffix = match[:suffix]
		return self.new(nil, Integer(suffix))
	else
		first = Integer(match[:first])
		last = match[:last]
		last = last.empty? ? nil : Integer(last)
		
		if last && last < first
			raise ParseError, "Invalid byte range: #{value.inspect}"
		end
		
		return self.new(first, last)
	end
end

`def resolve(size)`

Resolve this byte range against the selected representation size.

Signature

parameter　size　Integer: The size of the selected representation.
returns　::Range | Nil: The resolved range, or nil when it is unsatisfiable.

Implementation

def resolve(size)
	if first
		if first < size
			return first..[last || size - 1, size - 1].min
		end
	elsif last > 0 && size > 0
		return [0, size - last].max..size - 1
	end
	
	return nil
end

`def to_s`

Convert this byte range to its wire representation.

Signature

returns　String: The serialized byte range.

Implementation

def to_s
	if first
		"#{first}-#{last}"
	else
		"-#{last}"
	end
end