77 lines
1.5 KiB
C++
77 lines
1.5 KiB
C++
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#include "common.h"
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#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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QByteArray data;
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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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QByteArray bytes;
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bytes.resize(entSize);
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st.read(bytes.data(), entSize);
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st.seekg(pos);
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auto zero = std::find(entName.cbegin(), entName.cend(), '\0');
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std::string out;
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std::copy(entName.cbegin(), zero, std::back_inserter(out));
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PakEntry ent;
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ent.name = std::move(out);
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ent.data = std::move(bytes);
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return ent;
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}
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PakFile readPakFile(std::istream &st) {
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auto hdr = readPakHeader(st);
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st.seekg(hdr.dirOffset);
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PakFile pak;
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for(quint32 i = 0; i < hdr.dirNum; i++) {
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auto ent = readPakEntry(st);
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pak.emplace(std::move(ent.name), std::move(ent.data));
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}
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return pak;
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}
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// EOF
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