Martin Michelsen
77 lines
2.0 KiB
C++
77 lines
2.0 KiB
C++
#include "GSLArchive.hh"
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#include <phosg/Encoding.hh>
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#include <phosg/Filesystem.hh>
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#include <stdexcept>
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#include "Text.hh"
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using namespace std;
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template <typename LongT>
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struct GSLHeaderEntry {
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ptext<char, 0x20> filename;
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LongT offset; // In pages, so actual offset is this * 0x800
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LongT size;
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uint64_t unused;
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} __attribute__((packed));
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template <typename LongT>
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void GSLArchive::load_t() {
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StringReader r(*this->data);
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uint64_t min_data_offset = 0xFFFFFFFFFFFFFFFF;
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while (r.where() < min_data_offset) {
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const auto& entry = r.get<GSLHeaderEntry<LongT>>();
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if (entry.filename.len() == 0) {
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break;
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}
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uint64_t offset = static_cast<uint64_t>(entry.offset) * 0x800;
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if (offset + entry.size > this->data->size()) {
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throw runtime_error("GSL entry extends beyond end of data");
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}
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this->entries.emplace(entry.filename, Entry{offset, entry.size});
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}
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}
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GSLArchive::GSLArchive(shared_ptr<const string> data, bool big_endian)
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: data(data) {
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if (big_endian) {
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this->load_t<be_uint32_t>();
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} else {
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this->load_t<le_uint32_t>();
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}
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}
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const unordered_map<string, GSLArchive::Entry> GSLArchive::all_entries() const {
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return this->entries;
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}
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pair<const void*, size_t> GSLArchive::get(const std::string& name) const {
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try {
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const auto& entry = this->entries.at(name);
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return make_pair(this->data->data() + entry.offset, entry.size);
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} catch (const out_of_range&) {
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throw out_of_range("GSL does not contain file: " + name);
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}
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}
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string GSLArchive::get_copy(const string& name) const {
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try {
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const auto& entry = this->entries.at(name);
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return this->data->substr(entry.offset, entry.size);
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} catch (const out_of_range&) {
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throw out_of_range("GSL does not contain file: " + name);
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}
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}
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StringReader GSLArchive::get_reader(const string& name) const {
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try {
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const auto& entry = this->entries.at(name);
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return StringReader(this->data->data() + entry.offset, entry.size);
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} catch (const out_of_range&) {
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throw out_of_range("GSL does not contain file: " + name);
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}
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}
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