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/*
RawSpeed - RAW file decoder.
Copyright (C) 2018 Roman Lebedev
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; withexpected even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "decompressors/HuffmanTable.h" // for HuffmanTableLUT, HuffmanTable
#include "common/Common.h" // for uchar8
#include "io/BitPumpMSB.h" // for BitPumpMSB, BitStream<>::fil...
#include "io/Buffer.h" // for Buffer, DataBuffer
#include "io/ByteStream.h" // for ByteStream
#include "io/Endianness.h" // for Endianness, Endianness::little
#include <array> // for array
#include <gtest/gtest.h> // for Test, Message, TestPartResult
#include <initializer_list> // for initializer_list<>::const_it...
#include <utility> // for move
#include <vector> // for vector
namespace rawspeed {
class RawDecoderException;
}
using rawspeed::BitPumpMSB;
using rawspeed::Buffer;
using rawspeed::ByteStream;
using rawspeed::DataBuffer;
using rawspeed::Endianness;
using rawspeed::HuffmanTable;
using rawspeed::uchar8;
namespace rawspeed_test {
auto genHT =
[](std::initializer_list<uchar8>&& nCodesPerLength) -> HuffmanTable {
HuffmanTable ht;
std::vector<uchar8> v(nCodesPerLength.begin(), nCodesPerLength.end());
v.resize(16);
Buffer b(v.data(), v.size());
ht.setNCodesPerLength(b);
return ht;
};
auto genHTFull =
[](std::initializer_list<uchar8>&& nCodesPerLength,
std::initializer_list<uchar8>&& codeValues) -> HuffmanTable {
auto ht = genHT(std::move(nCodesPerLength));
std::vector<uchar8> v(codeValues.begin(), codeValues.end());
Buffer b(v.data(), v.size());
ht.setCodeValues(b);
return ht;
};
TEST(HuffmanTableTest, DecodeLengthIdentityTest) {
static const std::array<rawspeed::uchar8, 4> data{
{0b01010101, 0b01010101, 0b01010101, 0b01010101}};
const Buffer b(data.data(), data.size());
const DataBuffer db(b, Endianness::little);
const ByteStream bs(db);
BitPumpMSB p(bs);
auto ht = genHTFull({2}, {4, 8});
ht.setup(false, false);
for (int i = 0; i < 32; i += 2) {
ASSERT_EQ(ht.decodeLength(p), 4);
ASSERT_EQ(ht.decodeLength(p), 8);
}
}
TEST(HuffmanTableTest, DecodeNextIdentityTest) {
static const std::array<rawspeed::uchar8, 4> data{
{0b00000000, 0b11010101, 0b01010101, 0b01111111}};
const Buffer b(data.data(), data.size());
const DataBuffer db(b, Endianness::little);
const ByteStream bs(db);
BitPumpMSB p(bs);
auto ht = genHTFull({2}, {7, 7 + 8});
ht.setup(true, false);
ASSERT_EQ(ht.decodeNext(p), -127);
ASSERT_EQ(ht.decodeNext(p), 21845);
ASSERT_EQ(ht.decodeNext(p), 127);
}
TEST(HuffmanTableTest, DecodeLengthBadCodeTest) {
static const std::array<rawspeed::uchar8, 4> data{{0b01000000}};
const Buffer b(data.data(), data.size());
const DataBuffer db(b, Endianness::little);
const ByteStream bs(db);
BitPumpMSB p(bs);
auto ht = genHTFull({1}, {4});
ht.setup(false, false);
ASSERT_EQ(ht.decodeLength(p), 4);
ASSERT_THROW(ht.decodeLength(p), rawspeed::RawDecoderException);
}
TEST(HuffmanTableTest, DecodeNextBadCodeTest) {
static const std::array<rawspeed::uchar8, 4> data{{0b00100000}};
const Buffer b(data.data(), data.size());
const DataBuffer db(b, Endianness::little);
const ByteStream bs(db);
BitPumpMSB p(bs);
auto ht = genHTFull({1}, {1});
ht.setup(true, false);
ASSERT_EQ(ht.decodeNext(p), -1);
ASSERT_THROW(ht.decodeNext(p), rawspeed::RawDecoderException);
}
} // namespace rawspeed_test
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