feat: add readSaveTable and chunkIsAllAir to SaveMigration
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dualfroz committed
1 parent
48f48bf57b
commit
6ffb347552
1 file changed
+155
@@ -158,3 +158,158 @@ std::size_t saveHeaderSectors(const SaveHeader& header) {
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return divideUp(saveHeaderBytes + saveTableBytes(header), header.sectorBytes);
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return divideUp(saveHeaderBytes + saveTableBytes(header), header.sectorBytes);
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}
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}
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std::size_t saveDataStart(const SaveHeader& header) {
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return saveHeaderSectors(header) * static_cast<std::size_t>(header.sectorBytes);
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}
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bool readSaveTable(const uint8_t* data, std::size_t size, const SaveHeader& header,
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std::vector<SaveTableEntry>& out) {
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out.clear();
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for (uint32_t i = 0; i < header.chunkCount; ++i) {
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std::size_t at = saveHeaderBytes + static_cast<std::size_t>(i) * saveEntryBytes;
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if (at + saveEntryBytes > size) return false;
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SaveTableEntry entry;
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entry.coord.x = static_cast<int32_t>(readU32Be(data + at + 0));
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entry.coord.y = static_cast<int32_t>(readU32Be(data + at + 4));
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entry.coord.z = static_cast<int32_t>(readU32Be(data + at + 8));
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entry.sectorOffset = readU32Be(data + at + 12);
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entry.sectorCount = readU32Be(data + at + 16);
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entry.payloadBytes = readU32Be(data + at + 20);
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out.push_back(entry);
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}
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return true;
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}
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std::vector<uint8_t> defaultChunkLight(const Chunk& chunk, uint8_t skyLevel) {
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uint8_t sky = skyLevel > 15 ? 15 : skyLevel;
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std::vector<uint8_t> plane(chunkVolume, 0);
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const std::array<Block, chunkVolume>& blocks = chunk.raw();
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for (std::size_t i = 0; i < blocks.size(); ++i) {
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uint8_t skyHere = occludesLight(blocks[i]) ? 0u : sky;
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uint8_t emitted = static_cast<uint8_t>(blockLightEmission(blocks[i]));
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plane[i] = static_cast<uint8_t>((skyHere << 4) | (emitted & 0x0Fu));
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}
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return plane;
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}
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bool chunkIsAllAir(const Chunk& chunk) {
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for (Block block : chunk.raw())
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if (block != Block::Air) return false;
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return true;
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}
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ByteBuffer encodeChunkPayload(SaveVersion version, const SaveChunkRecord& record,
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bool compressBody) {
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ByteBuffer out;
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if (version == SaveVersion::V1) {
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putU32Be(out, static_cast<uint32_t>(chunkVolume));
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for (Block block : record.blocks.raw()) out.push_back(static_cast<uint8_t>(block));
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return out;
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}
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std::vector<Block> palette;
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std::vector<uint32_t> indices;
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buildPalette(record.blocks, palette, indices);
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if (version == SaveVersion::V2 || version == SaveVersion::V3) {
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putU32Be(out, static_cast<uint32_t>(palette.size()));
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for (Block block : palette) out.push_back(static_cast<uint8_t>(block));
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putU32Be(out, static_cast<uint32_t>(indices.size()));
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for (uint32_t index : indices) out.push_back(static_cast<uint8_t>(index));
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if (version == SaveVersion::V3) {
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putU32Be(out, static_cast<uint32_t>(record.light.size()));
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out.insert(out.end(), record.light.begin(), record.light.end());
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putU32Be(out, fnv1a32(out.data(), out.size()));
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}
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return out;
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}
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int bitWidth = BitPacker::bitWidthForPalette(palette.size());
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std::vector<uint64_t> words = BitPacker::pack(indices, bitWidth);
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ByteBuffer body;
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putU32Be(body, static_cast<uint32_t>(palette.size()));
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for (Block block : palette) body.push_back(static_cast<uint8_t>(block));
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putU32Be(body, static_cast<uint32_t>(bitWidth));
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putU32Be(body, static_cast<uint32_t>(words.size()));
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for (uint64_t word : words) writeU64Be(body, word);
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putU32Be(body, static_cast<uint32_t>(record.light.size()));
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body.insert(body.end(), record.light.begin(), record.light.end());
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writeU64Be(body, record.meta.inhabitedTicks);
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writeU64Be(body, record.meta.lastSavedTick);
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body.push_back(record.meta.generationStage);
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uint32_t bodyChecksum = fnv1a32(body.data(), body.size());
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ByteBuffer stored = compressBody ? compress(body) : body;
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uint32_t flags = 0;
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if (record.empty || chunkIsAllAir(record.blocks)) flags |= saveRecordEmpty;
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if (compressBody) flags |= saveRecordCompressed;
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putU32Be(out, flags);
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putU32Be(out, static_cast<uint32_t>(stored.size()));
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out.insert(out.end(), stored.begin(), stored.end());
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putU32Be(out, bodyChecksum);
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return out;
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}
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namespace {
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bool decodeBodyV4(const uint8_t* body, std::size_t bodySize, SaveChunkRecord& out,
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SavePayloadInfo* info) {
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PayloadCursor cursor{body, bodySize};
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uint32_t paletteCount = cursor.u32();
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if (cursor.bad || paletteCount == 0 || paletteCount > 4096u) return false;
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std::vector<uint8_t> paletteBytes;
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if (!cursor.take(paletteCount, paletteBytes)) return false;
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uint32_t bitWidth = cursor.u32();
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uint32_t wordCount = cursor.u32();
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if (cursor.bad || bitWidth == 0 || bitWidth > 32u) return false;
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int perWord = 64 / static_cast<int>(bitWidth);
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std::size_t neededWords = divideUp(chunkVolume, static_cast<std::size_t>(perWord));
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if (wordCount < neededWords) return false;
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if (wordCount > neededWords + 64u) return false;
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std::vector<uint64_t> words;
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words.reserve(wordCount);
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for (uint32_t i = 0; i < wordCount; ++i) words.push_back(cursor.u64());
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if (cursor.bad) return false;
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uint32_t lightBytes = cursor.u32();
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if (cursor.bad || lightBytes > static_cast<uint32_t>(chunkVolume)) return false;
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if (!cursor.take(lightBytes, out.light)) return false;
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out.meta.inhabitedTicks = cursor.u64();
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out.meta.lastSavedTick = cursor.u64();
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out.meta.generationStage = cursor.u8();
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if (cursor.bad) return false;
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std::vector<uint32_t> indices =
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BitPacker::unpack(words, static_cast<int>(bitWidth), chunkVolume);
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uint32_t maxIndex = 0;
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std::array<Block, chunkVolume>& blocks = out.blocks.raw();
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for (std::size_t i = 0; i < blocks.size(); ++i) {
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uint32_t index = indices[i];
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if (index > maxIndex) maxIndex = index;
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blocks[i] = index < paletteCount ? static_cast<Block>(paletteBytes[index]) : Block::Air;
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}
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if (info) {
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info->paletteCount = paletteCount;
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info->maxIndex = maxIndex;
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info->bitWidth = bitWidth;
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info->lightBytes = lightBytes;
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info->rawBodyBytes = bodySize;
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}
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return true;
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}
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} // namespace
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bool decodeChunkPayload(SaveVersion version, const uint8_t* data, std::size_t size,
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SaveChunkRecord& out, SavePayloadInfo* info) {
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if (info) *info = SavePayloadInfo{};
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out.light.clear();
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out.empty = false;
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out.meta = SaveChunkMeta{};
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