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#!/usr/bin/env ruby
require File.expand_path(File.join(File.dirname(__FILE__), "test_helper"))
describe BinData::Skip, "when instantiating" do
describe "with no mandatory parameters supplied" do
it "raises an error" do
args = {}
_ { BinData::Skip.new(args) }.must_raise ArgumentError
end
end
end
describe BinData::Skip, "with :length" do
let(:obj) { BinData::Skip.new(length: 5) }
let(:io) { StringIO.new("abcdefghij") }
it "initial state" do
_(obj).must_equal ""
_(obj.to_binary_s).must_equal_binary "\000" * 5
end
it "skips bytes" do
obj.read(io)
_(io.pos).must_equal 5
end
it "has expected binary representation after setting value" do
obj.assign("123")
_(obj.to_binary_s).must_equal_binary "\000" * 5
end
it "has expected binary representation after reading" do
obj.read(io)
_(obj.to_binary_s).must_equal_binary "\000" * 5
end
end
describe BinData::Skip, "with :to_abs_offset" do
BinData::Struct.new(fields: [ [:skip, :f, { to_abs_offset: 5 } ] ])
let(:skip_obj) { [:skip, :f, { to_abs_offset: 5 } ] }
let(:io) { StringIO.new("abcdefghij") }
it "reads skipping forward" do
fields = [ skip_obj ]
obj = BinData::Struct.new(fields: fields)
obj.read(io)
_(io.pos).must_equal 5
end
it "reads skipping in place" do
fields = [ [:string, :a, { read_length: 5 }], skip_obj ]
obj = BinData::Struct.new(fields: fields)
obj.read(io)
_(io.pos).must_equal 5
end
it "does not read skipping backwards" do
fields = [ [:string, :a, { read_length: 10 }], skip_obj ]
obj = BinData::Struct.new(fields: fields)
_ {
obj.read(io)
}.must_raise ArgumentError
end
it "writes skipping forward" do
fields = [ skip_obj ]
obj = BinData::Struct.new(fields: fields)
_(obj.to_binary_s).must_equal "\000\000\000\000\000"
end
it "reads skipping in place" do
fields = [ [:string, :a, { value: "abcde" }], skip_obj ]
obj = BinData::Struct.new(fields: fields)
_(obj.to_binary_s).must_equal "abcde"
end
it "does not write skipping backwards" do
fields = [ [:string, :a, { value: "abcdefghij" }], skip_obj ]
obj = BinData::Struct.new(fields: fields)
_ {
obj.to_binary_s
}.must_raise ArgumentError
end
end
describe BinData::Skip, "with :until_valid" do
let(:io) { StringIO.new("abcdefghij") }
it "doesn't skip when writing" do
skip_obj = [:string, { read_length: 1, assert: "f" }]
args = { until_valid: skip_obj }
obj = BinData::Skip.new(args)
_(obj.to_binary_s).must_equal ""
end
it "skips to valid match" do
skip_obj = [:string, { read_length: 1, assert: "f" }]
fields = [ [:skip, :s, { until_valid: skip_obj }] ]
obj = BinData::Struct.new(fields: fields)
obj.read(io)
_(io.pos).must_equal 5
end
it "won't skip on unseekable stream" do
rd, wr = IO::pipe
unseekable_io = BinData::IO::Read.new(rd)
wr.write io
wr.close
skip_obj = [:string, { read_length: 1, assert: "f" }]
fields = [ [:skip, :s, { until_valid: skip_obj }] ]
obj = BinData::Struct.new(fields: fields)
_ {obj.read(unseekable_io)}.must_raise IOError
rd.close
end
it "doesn't skip when validator doesn't assert" do
skip_obj = [:string, { read_length: 1 }]
fields = [ [:skip, :s, { until_valid: skip_obj }] ]
obj = BinData::Struct.new(fields: fields)
obj.read(io)
_(io.pos).must_equal 0
end
it "raises IOError when no match" do
skip_obj = [:string, { read_length: 1, assert: "X" }]
fields = [ [:skip, :s, { until_valid: skip_obj }] ]
obj = BinData::Struct.new(fields: fields)
_ {
obj.read(io)
}.must_raise IOError
end
it "raises IOError when validator reads beyond stream" do
skip_obj = [:string, { read_length: 30 }]
fields = [ [:skip, :s, { until_valid: skip_obj }] ]
obj = BinData::Struct.new(fields: fields)
_ {
obj.read(io)
}.must_raise IOError
end
it "uses block form" do
class DSLSkip < BinData::Record
skip :s do
string read_length: 1, assert: "f"
end
string :a, read_length: 1
end
obj = DSLSkip.read(io)
_(obj.a).must_equal "f"
end
end
describe BinData::Skip, "with :until_valid" do
class SkipSearch < BinData::Record
skip :s do
uint8
uint8 asserted_value: 1
uint8 :a
uint8 :b
virtual assert: -> { a == b }
end
array :data, type: :uint8, initial_length: 4
end
let(:io) { BinData::IO.create_string_io("\x0f" * 10 + "\x00\x01\x02\x03\x00" + "\x02\x01\x03\x03" + "\x06") }
it "finds valid match" do
obj = SkipSearch.read(io)
_(obj.data).must_equal [2, 1, 3, 3]
end
it "match is at expected offset" do
obj = SkipSearch.read(io)
_(obj.data.rel_offset).must_equal 15
end
end
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