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# frozen_string_literal: true
require 'spec_helper'
require 'ttfunk/table/cff/index'
RSpec.describe TTFunk::Table::Cff::Index do
test_cases = {
[
# count
0x00, 0x03,
# offset len
0x01,
# offsets
0x01, 0x02, 0x03, 0x04,
# data
0xA,
0xB,
0xC,
] => [[10], [11], [12]],
[
# count
0x00, 0x03,
# offset len
0x01,
# offsets
0x01, 0x03, 0x07, 0x08,
# data
0x11, 0x22,
0x33, 0x44, 0x55, 0x66,
0x77,
] => [[17, 34], [51, 68, 85, 102], [119]],
[0x00, 0x00] => [],
}
describe 'decoding' do
test_cases.each_with_index do |(bytes, decoded_values), idx|
context "with example #{idx}" do
subject(:index) do
io = StringIO.new(bytes.pack('C*'))
described_class.new(TestFile.new(io), 0, bytes.size)
end
it 'parses correctly' do
expect(index.map(&:bytes)).to eq(decoded_values)
end
it 'encodes correctly' do
expect(index.encode.bytes).to eq(bytes)
end
it 'calculates the length correctly' do
expect(index.length).to eq(bytes.size)
end
end
end
end
describe 'encoding' do
it 'properly encodes items (change)' do
inc_index_class =
Class.new(described_class) do
private
def encode_items(*)
# Increase each byte by 1
items.map { |i| [i.unpack1('C') + 1].pack('C') }
end
end
data = [
# count
0x00, 0x03,
# offset len
0x01,
# offsets
0x01, 0x02, 0x03, 0x04,
# data
0x01, 0x02, 0x03,
].pack('C*')
index = inc_index_class.new(TestFile.new(StringIO.new(data)), 0, data.length)
expect(index.encode.string).to eq("\00\03\01\01\02\03\04\02\03\04")
end
it 'properly encodes items (filter)' do
dup_index_class =
Class.new(described_class) do
private
def encode_items(*)
# duplicate each item
items.flat_map { |i| [i, i] }
end
end
data = [
# count
0x00, 0x03,
# offset len
0x01,
# offsets
0x01, 0x02, 0x03, 0x04,
# data
0x01, 0x02, 0x03,
].pack('C*')
index = dup_index_class.new(TestFile.new(StringIO.new(data)), 0, data.length)
expect(index.encode.string).to eq("\00\06\01\01\02\03\04\05\06\07\01\01\02\02\03\03")
end
[
{ item_size: 1, data_size: 6, offset_size: 1 },
{ item_size: 0xff, data_size: 262, offset_size: 2 },
{ item_size: 0xffff, data_size: 65_544, offset_size: 3 },
{ item_size: 0xffffff, data_size: 16_777_226, offset_size: 4 },
].each do |params|
it "properly encodes offset size #{params[:offset_size]}" do
gen_index_class =
Class.new(described_class) do
attr_accessor :item_size
private
def encode_items(*)
["\00" * item_size]
end
end
gen_index = gen_index_class.new(TestFile.new(StringIO.new("\00\00")), 0, 2)
gen_index.item_size = params[:item_size]
data = gen_index.encode.string
expect(data.length).to eq params[:data_size]
index = described_class.new(TestFile.new(StringIO.new(data)), 0, data.length)
expect(index.items_count).to eq 1
end
end
it 'raises on more items than is possible to encode' do
gen_index_class =
Class.new(described_class) do
private
def encode_items(*)
["\00"] * 0x10000
end
end
gen_index = gen_index_class.new(TestFile.new(StringIO.new("\00\00")), 0, 2)
expect { gen_index.encode }.to raise_error(/too many items/i)
end
end
end
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