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/* ScummVM Tools
*
* ScummVM Tools is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* This program 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.
*
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <cstring>
#include <cstdlib>
#include <cstdio>
#include <cassert>
#include <iostream>
#include <fstream>
#include <string>
#include <sstream>
#include "lab.h"
#include "common/endian.h"
Lab::Lab(std::string filename) : _filename(filename) {
// allocate a 1mb buffer to start with
bufSize = 1024 * 1024;
buf = (char *)malloc(bufSize);
Load(filename);
}
Lab::~Lab() {
free(buf);
delete[] str_table;
delete[] entries;
}
void Lab::Load(std::string filename) {
infile = fopen(filename.c_str(), "rb");
if (infile == 0) {
std::cout << "Can not open source file: " << filename << std::endl;
exit(1);
}
fread(&head.magic, 1, 4, infile);
fread(&head.magic2, 1, 4, infile);
uint32 num, s_size, s_offset;
fread(&num, 1, 4, infile);
fread(&s_size, 1, 4, infile);
uint32 typeTest = 0;
fread(&typeTest, 1, 4, infile);
if (typeTest == 0) { // First entry of the table has offset 0 for Grim
g_type = GT_GRIM;
fseek(infile, -4, SEEK_CUR);
} else { // EMI has an offset instead.
s_offset = typeTest;
g_type = GT_EMI;
}
head.num_entries = READ_LE_UINT32(&num);
head.string_table_size = READ_LE_UINT32(&s_size);
if (0 != memcmp(&head.magic, "LABN", 4)) {
std::cout << "There is no LABN header in source lab-file\n";
exit(1);
}
entries = new lab_entry[head.num_entries];
str_table = new char[head.string_table_size];
if (!str_table || !entries) {
std::cout << "Could not allocate memory\n";
exit(1);
}
// Grim-stuff
if (g_type == GT_GRIM) {
fread(entries, 1, head.num_entries * sizeof(lab_entry), infile);
fread(str_table, 1, head.string_table_size, infile);
} else if (g_type == GT_EMI) { // EMI-stuff
// EMI has a string-table-offset
head.string_table_offset = READ_LE_UINT32(&s_offset) - 0x13d0f;
// Find the string-table
fseek(infile, head.string_table_offset, SEEK_SET);
// Read the entire string table into str-table
fread(str_table, 1, head.string_table_size, infile);
fseek(infile, 20, SEEK_SET);
// Decrypt the string table
uint32 j;
for (j = 0; j < head.string_table_size; j++)
if (str_table[j] != 0) {
str_table[j] ^= 0x96;
}
fread(entries, 1, head.num_entries * sizeof(lab_entry), infile);
}
}
int Lab::getIndex(std::string filename) {
for (uint32 i = 0; i < head.num_entries; i++) {
const char *fname = str_table + READ_LE_UINT32(&entries[i].fname_offset);
std::string test = std::string(fname);
if (test != filename) {
continue;
} else {
return i;
}
}
return -1;
}
std::string Lab::getFileName(int index) {
return str_table + READ_LE_UINT32(&entries[index].fname_offset);
}
std::istream *Lab::getFile(std::string filename) {
if (!buf) {
printf("Could not allocate memory\n");
exit(1);
}
int index = getIndex(filename);
if (index == -1) {
return NULL;
} else {
offset = READ_LE_UINT32(&entries[index].start);
uint32 size = READ_LE_UINT32(&entries[index].size);
if (bufSize < size) {
bufSize = size;
char *newBuf = (char *)realloc(buf, bufSize);
if (!newBuf) {
printf("Could not reallocate memory\n");
exit(1);
} else {
buf = newBuf;
}
}
std::fstream stream(_filename.c_str(), std::ios::in | std::ios::binary);
stream.seekg(offset, std::ios::beg);
stream.read(buf, size);
std::istringstream *iss = new std::istringstream(std::string(buf, buf + size));
return iss;
}
return NULL;
}
int Lab::getLength(std::string filename) {
int index = getIndex(filename);
if (index == -1) {
return 0;
}
return entries[index].size;
}
std::istream *getFile(std::string filename, Lab *lab) {
std::istream *stream;
if (lab) {
return lab->getFile(filename);
} else {
stream = new std::fstream(filename.c_str(), std::ios::in | std::ios::binary);
if (!((std::fstream *)stream)->is_open()) {
std::cout << "Unable to open file " << filename << std::endl;
return 0;
}
return stream;
}
}
std::istream *getFile(std::string filename, Lab *lab, int &length) {
std::istream *stream;
if (lab) {
length = lab->getLength(filename);
return lab->getFile(filename);
} else {
stream = new std::fstream(filename.c_str(), std::ios::in | std::ios::binary);
if (!((std::fstream *)stream)->is_open()) {
std::cout << "Unable to open file " << filename << std::endl;
return 0;
}
stream->seekg(0, std::ios::end);
length = (int)stream->tellg();
stream->seekg(0, std::ios::beg);
return stream;
}
}
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