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wzfile.cpp
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wzfile.cpp
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#include <iostream>
#include <algorithm>
#include <unistd.h>
#include <boost/filesystem.hpp>
#include "wzfile.hpp"
#include "constants.hpp"
bool BasicWZFile::sanityCheck() {
if (!accessor.is_open()) {
return false;
}
if (header.fileIdentifier != maplereverence::wzIdentifier) {
return false;
}
// check the size of file is the size given by the bytes
accessor.seek(0, std::ios::end);
unsigned long fileSize = header.dataSize + header.headerSize;
if (fileSize != static_cast<unsigned long>(accessor.tell())) {
return false;
}
return true;
}
void BasicWZFile::readHeader() {
header.fileIdentifier = accessor.readString(4);
header.dataSize = accessor.readUnsignedLong();
header.headerSize = accessor.readUnsignedInt();
header.fileDesc = accessor.readString();
header.version = accessor.readUnsignedShort();
}
void BasicWZFile::generateMapleEntries(MapleFolder* folder) {
int32_t numFiles = accessor.readCompressedInt();
std::cout << folder->getName() << " | Num files: " << numFiles << '\n';
for (int i = 0; i < numFiles; ++i) {
int curPos = accessor.tell();
uint8_t flag = accessor.readUnsignedByte();
// string symlink
// @TODO this might just be a link to the name of the file
// @TODO not actually a symlink to a file
if (flag == 2) { //0b10
// @TODO a +1 is required because the offset arrives at the 'flag' variable
uint32_t stringOffset = accessor.readUnsignedInt() + header.headerSize + 1;
std::string name = accessor.readEncryptedString(stringOffset);
int32_t size = accessor.readCompressedInt();
int32_t checksum = accessor.readCompressedInt();
int32_t unknown = accessor.readInt();
// @TODO change this to actually be a symlink?
// @TODO this might actually be 'correct' since it's
// @TODO a pointer to the actualy location in the file
folder->addEntry(std::unique_ptr<MapleEntry>(
new MapleEntry(name, size, checksum, unknown, curPos)));
// folder
} else if (flag == 3) { //0b11
std::string name = accessor.readEncryptedString();
int32_t size = accessor.readCompressedInt();
int32_t checksum = accessor.readCompressedInt();
int32_t unknown = accessor.readInt();
folder->addEntry(std::unique_ptr<MapleFolder>(
new MapleFolder(name, size, checksum, unknown, curPos)));
// entry
} else if (flag == 4) { //0b11
std::string name = accessor.readEncryptedString();
int32_t size = accessor.readCompressedInt();
int32_t checksum = accessor.readCompressedInt();
int32_t unknown = accessor.readInt();
folder->addEntry(std::unique_ptr<MapleEntry>(
new MapleEntry(name, size, checksum, unknown, curPos)));
} else {
std::string exception("Unknown flag: ");
exception += std::to_string(flag);
exception += " at offset: ";
exception += std::to_string(accessor.tell());
throw std::runtime_error(exception);
}
}
for (const auto& entry : folder->getEntries()) {
auto* folder = dynamic_cast<MapleFolder*>(entry.get());
if (folder != nullptr) {
generateMapleEntries(folder);
}
}
}
void BasicWZFile::print() const {
// print header
std::cout << header.fileIdentifier << ' ' << header.dataSize << ' ';
std::cout << header.headerSize << ' ' << header.fileDesc << ' ';
std::cout << header.version << '\n';
// print maple entries
root->print();
}
void BasicWZFile::extract() {
root->extract(accessor);
}
const std::string& BasicWZFile::getName() const {
return name;
}
void BasicWZFile::findDataOffsets(MapleFolder* folder) {
// set folder offset to current
folder->setDataOffset(accessor.tell());
// files are located before folders
for (const auto& entry : folder->getEntries()) {
auto* folder = dynamic_cast<MapleFolder*>(entry.get());
if (folder == nullptr) {
entry->setDataOffset(accessor.tell());
accessor.seek(entry->getByteSize(), std::ios::cur);
}
}
// folders are located after files
for (const auto& entry : folder->getEntries()) {
auto* folder = dynamic_cast<MapleFolder*>(entry.get());
if (folder != nullptr) {
findDataOffsets(folder);
}
}
}
void MapleEntry::setDataOffset(int dataOffset) {
this->dataOffset = dataOffset;
}
int MapleEntry::getDataOffset() const {
return dataOffset;
}
uint32_t MapleEntry::getByteSize() const {
return bytesize;
}
const std::string& MapleEntry::getName() const {
return name;
}
void MapleEntry::print() const {
std::cout << name << " | " << headerOffset << ' ';
std::cout << dataOffset << " | " << bytesize << ' ';
std::cout << checksum << ' ' << unknown << '\n';
}
void MapleEntry::extract(MapleAccessor& accessor) {
// store cur pos
auto curPos = accessor.tell();
// move to pos and read bytesize into buffer
accessor.seek(dataOffset, std::ios::beg);
char sanityByte = accessor.readByte();
if (sanityByte != maplereverence::imgEntryStringByte) {
std::string exception("Invalid sanity byte: ");
exception += std::to_string(sanityByte);
exception += " at offset: ";
exception += std::to_string(accessor.tell());
throw std::runtime_error(exception);
}
// extract data
accessor.seek(dataOffset, std::ios::beg);
std::ofstream outStream(name, std::ios::out | std::ios::binary);
std::copy_n(std::istreambuf_iterator<char>(accessor.getStream()),
bytesize, std::ostreambuf_iterator<char>(outStream));
// restore old pos
accessor.seek(curPos);
}
void MapleFolder::extract(MapleAccessor& stream) {
// make folder and traverse into it
const boost::filesystem::path folderPath(getName());
boost::filesystem::create_directory(folderPath);
chdir(getName().c_str());
for (const auto& entry : entries) {
entry->extract(stream);
}
// traverse back
chdir("../");
}
void MapleFolder::addEntry(std::unique_ptr<MapleEntry> pointer) {
entries.emplace_back(std::move(pointer));
}
void MapleFolder::print() const {
std::cout << "Folder size: " << entries.size() << ' ';
MapleEntry::print();
for (const auto& entry : entries) {
entry->print();
}
}
const std::vector<std::unique_ptr<MapleEntry>>&
MapleFolder::getEntries() const {
return entries;
}