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#include "bounded_sequence_encoding.hh"
#include "../../util/scoped.hh"
#define BOOST_TEST_MODULE BoundedSequenceEncodingTest
#include <boost/test/unit_test.hpp>
namespace lm {
namespace interpolate {
namespace {
BOOST_AUTO_TEST_CASE(Simple) {
unsigned char bounds[] = {2};
BoundedSequenceEncoding enc(bounds, bounds + 1);
util::scoped_malloc backing(util::MallocOrThrow(enc.EncodedLength()));
unsigned char input = 1;
enc.Encode(&input, backing.get());
unsigned char output;
enc.Decode(backing.get(), &output);
BOOST_CHECK_EQUAL(1, output);
}
void ExhaustiveTest(unsigned char *bound_begin, unsigned char *bound_end) {
BoundedSequenceEncoding enc(bound_begin, bound_end);
util::scoped_malloc backing(util::MallocOrThrow(enc.EncodedLength()));
std::vector<unsigned char> values(bound_end - bound_begin),
out(bound_end - bound_begin);
while (true) {
enc.Encode(&values[0], backing.get());
enc.Decode(backing.get(), &out[0]);
for (std::size_t i = 0; i != values.size(); ++i) {
BOOST_CHECK_EQUAL(values[i], out[i]);
}
for (std::size_t i = 0;; ++i) {
if (i == values.size()) return;
++values[i];
if (values[i] < bound_begin[i]) break;
values[i] = 0;
}
}
}
void CheckEncodeDecode(unsigned char *bounds, unsigned char *input,
unsigned char *output, std::size_t len) {
BoundedSequenceEncoding encoder(bounds, bounds + len);
util::scoped_malloc backing(util::MallocOrThrow(encoder.EncodedLength()));
encoder.Encode(input, backing.get());
encoder.Decode(backing.get(), output);
for (std::size_t i = 0; i < len; ++i) {
BOOST_CHECK_EQUAL(input[i], output[i]);
}
}
BOOST_AUTO_TEST_CASE(Exhaustive) {
unsigned char bounds[] = {5, 2, 3, 9, 7, 20, 8};
ExhaustiveTest(bounds, bounds + sizeof(bounds) / sizeof(unsigned char));
}
BOOST_AUTO_TEST_CASE(LessThan64) {
unsigned char bounds[] = {255, 255, 255, 255, 255, 255, 255, 3};
unsigned char input[] = {172, 183, 254, 187, 96, 87, 65, 2};
unsigned char output[] = {0, 0, 0, 0, 0, 0, 0, 0};
std::size_t len = sizeof(bounds) / sizeof(unsigned char);
assert(sizeof(input) / sizeof(unsigned char) == len);
assert(sizeof(output) / sizeof(unsigned char) == len);
CheckEncodeDecode(bounds, input, output, len);
}
BOOST_AUTO_TEST_CASE(Exactly64) {
unsigned char bounds[] = {255, 255, 255, 255, 255, 255, 255, 255};
unsigned char input[] = {172, 183, 254, 187, 96, 87, 65, 16};
unsigned char output[] = {0, 0, 0, 0, 0, 0, 0, 0};
std::size_t len = sizeof(bounds) / sizeof(unsigned char);
assert(sizeof(input) / sizeof(unsigned char) == len);
assert(sizeof(output) / sizeof(unsigned char) == len);
CheckEncodeDecode(bounds, input, output, len);
}
BOOST_AUTO_TEST_CASE(MoreThan64) {
unsigned char bounds[] = {255, 255, 255, 255, 255, 255, 255, 255, 255};
unsigned char input[] = {172, 183, 254, 187, 96, 87, 65, 16, 137};
unsigned char output[] = {0, 0, 0, 0, 0, 0, 0, 0, 0};
std::size_t len = sizeof(bounds) / sizeof(unsigned char);
assert(sizeof(input) / sizeof(unsigned char) == len);
assert(sizeof(output) / sizeof(unsigned char) == len);
CheckEncodeDecode(bounds, input, output, len);
}
}}} // namespaces
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