Sha256: a16b475863e8dd5f632ceebfcb3cb424ccd9d8757459851a83851a47fcd41d41
Contents?: true
Size: 1.62 KB
Versions: 24
Compression:
Stored size: 1.62 KB
Contents
# frozen_string_literal: true
module OpenAssets
MARKER = "\x4f\x41"
VERSION = "\x01\x00"
# the open assets payload
class Payload
attr_accessor :quantities
attr_accessor :metadata
def initialize(quantities = [], metadata = '')
@quantities = quantities
@metadata = metadata
end
# parse open assets payload
# @return [Payload] a open assets payload object, if payload is invalid, return nil.
def self.parse_from_payload(payload)
buf = StringIO.new(payload)
marker = buf.read(2)
version = buf.read(2)
return nil if marker != MARKER || version != VERSION
count = Bitcoin.unpack_var_int_from_io(buf)
return nil unless count
quantities = []
count.times do
quantities << LEB128.decode_unsigned(buf, buf.pos)
end
metadata_length = Bitcoin.unpack_var_int_from_io(buf)
return nil if metadata_length.nil? || buf.length < metadata_length + buf.pos
metadata = buf.read(metadata_length).each_byte.map(&:chr).join
new(quantities, metadata)
rescue
# LEB128#decode_unsigned raise 'undefined method `unpack' for nil:NilClass'
# for invalid format such as "018f8f" (the most significant bit of the last byte should be 0)
nil
end
# generate binary payload
def to_payload
payload = String.new
payload << MARKER
payload << VERSION
payload << Bitcoin.pack_var_int(quantities.size) << quantities.map{|q| LEB128.encode_unsigned(q).read }.join
payload << Bitcoin.pack_var_int(metadata.length) << metadata.bytes.map{|b| sprintf("%02x", b)}.join.htb
payload
end
end
end
Version data entries
24 entries across 24 versions & 1 rubygems