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ba41bf0311
BrickBounds reads the <Bounding><AABB/> of every Primitives/<designID>.xml in the client's res/brickdb.zip (through the asset manager, so packed and unpacked clients both work), by design ID. A design listed only as another primitive's alias gets that primitive's box. Get() reads the file the first time it is called and keeps the boxes for every later call. The zip is read by a small reader in dCommon (Zip::ForEachEntry) that handles stored and deflated entries, with a raw inflate added to ZCompression. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
78 lines
3.1 KiB
C++
78 lines
3.1 KiB
C++
#include "Zip.h"
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#include "ZCompression.h"
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#include <cstdint>
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#include <cstring>
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namespace {
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constexpr uint32_t END_SIGNATURE = 0x06054b50;
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constexpr uint32_t CENTRAL_SIGNATURE = 0x02014b50;
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constexpr uint32_t LOCAL_SIGNATURE = 0x04034b50;
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constexpr uint64_t END_SIZE = 22;
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constexpr uint64_t MAX_COMMENT_SIZE = 65535;
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// Zip numbers are little endian
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template<typename T>
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bool ReadAt(const std::string_view data, const uint64_t offset, T& value) {
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if (offset > data.size() || sizeof(T) > data.size() - offset) return false;
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value = 0;
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for (uint64_t i = 0; i < sizeof(T); i++) value |= static_cast<T>(static_cast<uint8_t>(data[offset + i])) << (8 * i);
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return true;
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}
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}
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bool Zip::ForEachEntry(const std::string_view zip, const std::function<bool(std::string_view name)>& wanted,
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const std::function<void(std::string_view name, std::string_view data)>& visit) {
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if (zip.size() < END_SIZE) return false;
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// The end of central directory record: the last one in the file, after which only its comment can come
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uint64_t end = 0;
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bool found = false;
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const uint64_t lowest = zip.size() > END_SIZE + MAX_COMMENT_SIZE ? zip.size() - END_SIZE - MAX_COMMENT_SIZE : 0;
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for (uint64_t i = zip.size() - END_SIZE + 1; i-- > lowest;) {
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uint32_t signature{};
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if (ReadAt(zip, i, signature) && signature == END_SIGNATURE) {
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end = i;
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found = true;
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break;
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}
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}
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if (!found) return false;
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uint16_t entries{};
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uint32_t directoryOffset{};
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if (!ReadAt(zip, end + 10, entries) || !ReadAt(zip, end + 16, directoryOffset)) return false;
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uint64_t offset = directoryOffset;
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for (uint16_t i = 0; i < entries; i++) {
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uint32_t signature{}, compressedSize{}, size{}, localOffset{};
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uint16_t method{}, nameLength{}, extraLength{}, commentLength{};
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if (!ReadAt(zip, offset, signature) || signature != CENTRAL_SIGNATURE || !ReadAt(zip, offset + 10, method) ||
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!ReadAt(zip, offset + 20, compressedSize) || !ReadAt(zip, offset + 24, size) || !ReadAt(zip, offset + 28, nameLength) ||
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!ReadAt(zip, offset + 30, extraLength) || !ReadAt(zip, offset + 32, commentLength) || !ReadAt(zip, offset + 42, localOffset) ||
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offset + 46 + nameLength > zip.size()) {
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return false;
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}
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const auto name = zip.substr(offset + 46, nameLength);
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offset += 46 + nameLength + extraLength + commentLength;
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if (!wanted(name)) continue;
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// The data follows the local header, whose name and extra field can differ in length from the central one's
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uint16_t localNameLength{}, localExtraLength{};
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if (!ReadAt(zip, localOffset, signature) || signature != LOCAL_SIGNATURE || !ReadAt(zip, localOffset + 26, localNameLength) ||
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!ReadAt(zip, localOffset + 28, localExtraLength)) {
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continue;
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}
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const uint64_t dataStart = static_cast<uint64_t>(localOffset) + 30 + localNameLength + localExtraLength;
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if (dataStart > zip.size() || compressedSize > zip.size() - dataStart) continue;
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const auto data = zip.substr(dataStart, compressedSize);
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if (method == 0) {
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visit(name, data);
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} else if (method == 8) {
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if (const auto inflated = ZCompression::InflateRaw(data, size)) visit(name, *inflated);
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}
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}
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return true;
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}
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