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/*
Mod Organizer BSA handling
Copyright (C) 2012 Sebastian Herbord. All rights reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "filehash.h"
#include <algorithm>
#include <climits>
#include <cstdlib>
#include <cstring>
#ifndef MAX_PATH
#define MAX_PATH PATH_MAX
#endif // MAX_PATH
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;
}
/**
* @brief calculateBSAHash
* @param fileName
* @return
* @note the hash calculated for folders seem to be wrong
*/
BSAHash calculateBSAHash(const std::string& fileName)
{
char fileNameLower[FILENAME_MAX + 1];
int i = 0;
for (; i < FILENAME_MAX && fileName[i] != '\0'; ++i) {
fileNameLower[i] = tolower(fileName[i]);
if (fileNameLower[i] == '/') {
fileNameLower[i] = '\\';
}
}
fileNameLower[i] = '\0';
unsigned char* fileNameLowerU = reinterpret_cast<unsigned char*>(fileNameLower);
size_t length = strlen(fileNameLower);
char* ext = strrchr(fileNameLower, '.');
if (ext == nullptr) {
ext = fileNameLower + length;
}
size_t extLen = strlen(ext);
length -= extLen;
unsigned char* extU = reinterpret_cast<unsigned char*>(ext);
BSAHash hash1 = 0ULL;
if (length > 0) {
hash1 = static_cast<BSAHash>(fileNameLowerU[length - 1] |
((length > 2 ? fileNameLowerU[length - 2] : 0) << 8) |
(length << 16) | (fileNameLowerU[0] << 24));
}
if (extLen > 0) {
if (strcmp(ext + 1, "kf") == 0) {
hash1 |= 0x80;
} else if (strcmp(ext + 1, "nif") == 0) {
hash1 |= 0x8000;
} else if (strcmp(ext + 1, "dds") == 0) {
hash1 |= 0x8080;
} else if (strcmp(ext + 1, "wav") == 0) {
hash1 |= 0x80000000;
}
BSAHash hash2 = static_cast<BSAHash>(genHashInt(fileNameLowerU + 1, extU - 2)) +
static_cast<BSAHash>(genHashInt(extU, extU + strlen(ext)));
hash1 |= (hash2 & 0xFFFFFFFF) << 32;
}
return hash1;
}
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