101 lines
2.0 KiB
C++
101 lines
2.0 KiB
C++
#include "quam/pak.h"
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struct PakHeader {
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quint32 dirOffset;
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quint32 dirNum;
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};
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struct PakEntry {
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std::string name;
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ArcFile file;
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};
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static constexpr quint32 sizeOfPakEntry = 64;
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static PakHeader readPakHeader(std::istream &st) {
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auto magic = readBytes<4>(st);
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if(magic != std::array{'P', 'A', 'C', 'K'}) {
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throw std::runtime_error("not a pak file (invalid magic number)");
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}
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auto dirOffset = readLE<quint32>(st);
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auto dirSize = readLE<quint32>(st);
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if(dirSize % sizeOfPakEntry != 0) {
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throw std::runtime_error("invalid directory size");
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}
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PakHeader hdr;
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hdr.dirOffset = dirOffset;
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hdr.dirNum = dirSize / sizeOfPakEntry;
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return hdr;
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}
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static PakEntry readPakEntry(std::istream &st) {
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auto entName = readBytes<56>(st);
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auto entOffset = readLE<quint32>(st);
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auto entSize = readLE<quint32>(st);
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auto pos = st.tellg();
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st.seekg(entOffset);
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ArcFile file;
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file.resize(entSize);
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st.read(file.data(), entSize);
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st.seekg(pos);
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std::string name = ntbsToString(entName);
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if(name.front() == '/') {
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throw std::runtime_error("empty root directory name");
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}
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PakEntry ent;
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ent.name = std::move(name);
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ent.file = std::move(file);
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return ent;
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}
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static void insertFile(ArcDir &dir, std::string name, ArcFile file) {
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std::optional<std::string> next;
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if(auto slash = name.find('/'); slash != std::string::npos) {
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next = name.substr(slash + 1);
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name = name.substr(0, slash);
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}
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auto existing = dir.findNode(name);
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if(next) {
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auto ref =
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existing != dir.end()
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? *existing
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: dir.emplace_back(ArcDir{}, std::move(name));
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insertFile(std::get<ArcDir>(ref), *std::move(next), std::move(file));
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} else {
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if(existing != dir.end()) {
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throw std::runtime_error("duplicate file");
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}
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dir.emplace_back(std::move(file), std::move(name));
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}
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}
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ArcDir readPak(std::istream &st) {
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auto hdr = readPakHeader(st);
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st.seekg(hdr.dirOffset);
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ArcDir root;
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for(quint32 i = 0; i < hdr.dirNum; i++) {
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auto ent = readPakEntry(st);
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insertFile(root, std::move(ent.name), std::move(ent.file));
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}
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return root;
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}
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// EOF
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