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/*
Copyright (C) 2012 Sebastian Herbord. All rights reserved.
This file is part of Mod Organizer.
Mod Organizer is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
Mod Organizer is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with Mod Organizer. If not, see <http://www.gnu.org/licenses/>.
*/
#include "dummybsa.h"
#include <QFile>
#include <stdexcept>
#ifdef _WIN32
#define WIN32_LEAN_AND_MEAN
#include <Windows.h>
#else
#ifndef MAX_PATH
#define MAX_PATH 260
#endif
#endif
static void writeUlong(unsigned char* buffer, int offset, unsigned long value)
{
union
{
unsigned long ulValue;
unsigned char cValue[4];
};
ulValue = value;
memcpy(buffer + offset, cValue, 4);
}
static void writeUlonglong(unsigned char* buffer, int offset, unsigned long long value)
{
union
{
unsigned long long ullValue;
unsigned char cValue[8];
};
ullValue = value;
memcpy(buffer + offset, cValue, 8);
}
static unsigned long genHashInt(const unsigned char* pos, const unsigned char* end)
{
unsigned long hash = 0;
for (; pos < end; ++pos) {
hash *= 0x1003f;
hash += *pos;
}
return hash;
}
static unsigned long long genHash(const char* fileName)
{
char fileNameLower[MAX_PATH + 1];
int i = 0;
for (; i < MAX_PATH && fileName[i] != '\0'; ++i) {
fileNameLower[i] = static_cast<char>(tolower(fileName[i]));
if (fileNameLower[i] == '\\') {
fileNameLower[i] = '/';
}
}
fileNameLower[i] = '\0';
unsigned char* fileNameLowerU = reinterpret_cast<unsigned char*>(fileNameLower);
char* ext = strrchr(fileNameLower, '.');
if (ext == nullptr) {
ext = fileNameLower + strlen(fileNameLower);
}
unsigned char* extU = reinterpret_cast<unsigned char*>(ext);
int length = ext - fileNameLower;
unsigned long long hash = 0ULL;
if (length > 0) {
hash = *(extU - 1) | ((length > 2 ? *(ext - 2) : 0) << 8) | (length << 16) |
(fileNameLowerU[0] << 24);
}
if (strlen(ext) > 0) {
if (strcmp(ext + 1, "kf") == 0) {
hash |= 0x80;
} else if (strcmp(ext + 1, "nif") == 0) {
hash |= 0x8000;
} else if (strcmp(ext + 1, "dds") == 0) {
hash |= 0x8080;
} else if (strcmp(ext + 1, "wav") == 0) {
hash |= 0x80000000;
}
unsigned long long temp =
static_cast<unsigned long long>(genHashInt(fileNameLowerU + 1, extU - 2));
temp += static_cast<unsigned long long>(genHashInt(extU, extU + strlen(ext)));
hash |= (temp & 0xFFFFFFFF) << 32;
}
return hash;
}
DummyBSA::DummyBSA(unsigned long bsaVersion)
: m_Version(bsaVersion), m_FolderName(""), m_FileName("dummy.dds"),
m_TotalFileNameLength(0)
{}
void DummyBSA::writeHeader(QFile& file)
{
unsigned char header[] = {
'B', 'S', 'A', '\0', // magic string
0xDE, 0xAD, 0xBE, 0xEF, // version - insert later
0x24, 0x00, 0x00, 0x00, // offset to folder recors. header size is static
0xDE, 0xAD, 0xBE, 0xEF, // archive flags - insert later
0x01, 0x00, 0x00, 0x00, // folder count
0x01, 0x00, 0x00, 0x00, // file count
0xDE, 0xAD, 0xBE, 0xEF, // total folder names length - insert later
0xDE, 0xAD, 0xBE, 0xEF, // total file names length - insert later
0xDE, 0xAD, 0xBE, 0xEF // file flags - insert later
};
writeUlong(header, 4, m_Version);
writeUlong(header, 12, 0x01 | 0x02); // has directories and has files.
writeUlong(header, 24,
static_cast<unsigned long>(m_FolderName.length()) +
1); // empty folder name
writeUlong(header, 28, m_TotalFileNameLength); // single character file name
writeUlong(header, 32, 2); // has dds
file.write(reinterpret_cast<char*>(header), sizeof(header));
}
void DummyBSA::writeFolderRecord(QFile& file, const std::string& folderName)
{
unsigned char folderRecord[] = {
0xDE, 0xAD, 0xBE, 0xEF, 0xDE, 0xAD, 0xBE, 0xEF, // folder hash
0x01, 0x00, 0x00, 0x00, // file count
0xDE, 0xAD, 0xBE, 0xEF, // offset to folder name
};
// we'd usually have to sort folders be the hash value generated here
writeUlonglong(folderRecord, 0, genHash(folderName.c_str()));
writeUlong(folderRecord, 12,
0x34 + m_TotalFileNameLength); // TODO: this should be calculated properly
file.write(reinterpret_cast<char*>(folderRecord), sizeof(folderRecord));
}
void DummyBSA::writeFileRecord(QFile& file, const std::string& fileName)
{
unsigned char fileRecord[] = {
0xDE, 0xAD, 0xBE, 0xEF, 0xDE, 0xAD, 0xBE, 0xEF, // file name hash
0xDE, 0xAD, 0xBE, 0xEF, // size
0xDE, 0xAD, 0xBE, 0xEF, // offset to file data
};
// we'd usually have to sort files by the value generated here
writeUlonglong(fileRecord, 0, genHash(fileName.c_str()));
writeUlong(fileRecord, 8, 0);
writeUlong(
fileRecord, 12,
0x44 + static_cast<unsigned long>(fileName.length() + 1) +
4); // after this record we expect the filename and 4 bytes of file size
file.write(reinterpret_cast<char*>(fileRecord), sizeof(fileRecord));
}
void DummyBSA::writeFileRecordBlocks(QFile& file, const std::string& folderName)
{
file.write(folderName.c_str(), folderName.length() + 1);
writeFileRecord(file, m_FileName);
}
void DummyBSA::write(const QString& fileName)
{
QFile file(fileName);
if (!file.open(QIODevice::WriteOnly)) {
throw std::runtime_error(
QString("failed to open dummy BSA for writing: %1").arg(fileName).toStdString());
}
m_TotalFileNameLength = static_cast<unsigned long>(m_FileName.length() + 1);
writeHeader(file);
writeFolderRecord(file, m_FolderName);
writeFileRecordBlocks(file, m_FolderName);
file.write(m_FileName.c_str(), m_FileName.length() + 1);
char fileSize[] = {0x00, 0x00, 0x00, 0x00};
file.write(fileSize, sizeof(fileSize));
file.close();
}
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