// Copyright (c) Athena Dev Teams - Licensed under GNU GPL
// For more information, see LICENCE in the main folder
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#ifndef _WIN32
#include <unistd.h>
#endif
#include "grfio.h"
#define MAP_NAME_LENGTH 12
#define MAP_NAME_LENGTH_EXT 16
#define NO_WATER 1000000
char grf_list_file[256] = "tools/mapcache/grf_files.txt";
char map_list_file[256] = "db/map_index.txt";
char map_cache_file[256] = "db/map_cache.dat";
int rebuild = 0;
FILE *map_cache_fp;
unsigned long file_size;
// Used internally, this structure contains the physical map cells
struct map_data {
short xs;
short ys;
unsigned char *cells;
};
// This is the main header found at the very beginning of the file
struct main_header {
unsigned long file_size;
unsigned short map_count;
} header;
// This is the header appended before every compressed map cells info
struct map_info {
char name[MAP_NAME_LENGTH];
short xs;
short ys;
long len;
};
/*************************************
* Big-endian compatibility functions *
*************************************/
// Converts a short (16 bits) from current machine order to little-endian
short MakeShortLE(short val)
{
unsigned char buf[2];
buf[0] = (unsigned char)( (val & 0x00FF) );
buf[1] = (unsigned char)( (val & 0xFF00) >> 0x08 );
return *((short*)buf);
}
// Converts a long (32 bits) from current machine order to little-endian
long MakeLongLE(long val)
{
unsigned char buf[4];
buf[0] = (unsigned char)( (val & 0x000000FF) );
buf[1] = (unsigned char)( (val & 0x0000FF00) >> 0x08 );
buf[2] = (unsigned char)( (val & 0x00FF0000) >> 0x10 );
buf[3] = (unsigned char)( (val & 0xFF000000) >> 0x18 );
return *((long*)buf);
}
// Reads an unsigned short (16 bits) in little-endian from the buffer
unsigned short GetUShort(const unsigned char *buf)
{
return ( ((unsigned short)(buf[0])) )
|( ((unsigned short)(buf[1])) << 0x08 );
}
// Reads a long (32 bits) in little-endian from the buffer
long GetLong(const unsigned char *buf)
{
return ( ((long)(buf[0])) )
|( ((long)(buf[1])) << 0x08 )
|( ((long)(buf[2])) << 0x10 )
|( ((long)(buf[3])) << 0x18 );
}
// Reads an unsigned long (32 bits) in little-endian from the buffer
unsigned long GetULong(const unsigned char *buf)
{
return ( ((unsigned long)(buf[0])) )
|( ((unsigned long)(buf[1])) << 0x08 )
|( ((unsigned long)(buf[2])) << 0x10 )
|( ((unsigned long)(buf[3])) << 0x18 );
}
// Reads a float (32 bits) from the buffer
float GetFloat(const unsigned char *buf)
{
unsigned long val = GetULong(buf);
return *((float*)&val);
}
// Reads a map from GRF's GAT and RSW files
int read_map(char *name, struct map_data *m)
{
char filename[256];
unsigned char *gat, *rsw;
int water_height;
size_t xy, off, num_cells;
float height[4];
unsigned long type;
// Open map GAT
sprintf(filename,"data\\%s.gat", name);
gat = (unsigned char *)grfio_read(filename);
if (gat == NULL)
return 0;
// Open map RSW
sprintf(filename,"data\\%s.rsw", name);
rsw = (unsigned char *)grfio_read(filename);
// Read water height
if (rsw) {
water_height = (int)GetFloat(rsw+166);
free(rsw);
} else
water_height = NO_WATER;
// Read map size and allocate needed memory
m->xs = (short)GetULong(gat+6);
m->ys = (short)GetULong(gat+10);
num_cells = (size_t)m->xs*m->ys;
m->cells = (unsigned char *)malloc(num_cells);
// Set cell properties
off = 14;
for (xy = 0; xy < num_cells; xy++)
{
// Height of the corners
height[0] = GetFloat( gat + off );
height[1] = GetFloat( gat + off + 4 );
height[2] = GetFloat( gat + off + 8 );
height[3] = GetFloat( gat + off + 12 );
// Type of cell
type = GetULong( gat + off + 16 );
off += 20;
if (water_height != NO_WATER && type == 0 && (height[0] > water_height || height[1] > water_height || height[2] > water_height || height[3] > water_height))
m->cells[xy] = 3; // Cell is 0 (walkable) but under water level, set to 3 (walkable water)
else
m->cells[xy] = (unsigned char)type;
}
free(gat);
return 1;
}
// Adds a map to the cache
void cache_map(char *name, struct map_data *m)
{
struct map_info info;
unsigned long len;
unsigned char *write_buf;
// Create an output buffer twice as big as the uncompressed map... this way we're sure it fits
len = m->xs*m->ys*2;
write_buf = (unsigned char *)malloc(len);
// Compress the cells and get the compressed length
encode_zip(write_buf, &len, m->cells, m->xs*m->ys);
// Fill the map header
strncpy(info.name, name, MAP_NAME_LENGTH);
info.xs = MakeShortLE(m->xs);
info.ys = MakeShortLE(m->ys);
info.len = MakeLongLE(len);
// Append map header then compressed cells at the end of the file
fseek(map_cache_fp, header.file_size, SEEK_SET);
fwrite(&info, sizeof(struct map_info), 1, map_cache_fp);
fwrite(write_buf, 1, len, map_cache_fp);
header.file_size += sizeof(struct map_info) + len;
header.map_count++;
free(write_buf);
free(m->cells);
return;
}
// Checks whether a map is already is the cache
int find_map(char *name)
{
int i;
struct map_info info;
fseek(map_cache_fp, sizeof(struct main_header), SEEK_SET);
for(i = 0; i < header.map_count; i++) {
fread(&info, sizeof(info), 1, map_cache_fp);
if(strcmp(name, info.name) == 0) // Map found
return 1;
else // Map not found, jump to the beginning of the next map info header
fseek(map_cache_fp, GetLong((unsigned char *)&(info.len)), SEEK_CUR);
}
return 0;
}
// Cuts the extension from a map name
char *remove_extension(char *mapname)
{
char *ptr, *ptr2;
ptr = strchr(mapname, '.');
if (ptr) { //Check and remove extension.
while (ptr[1] && (ptr2 = strchr(ptr+1, '.')))
ptr = ptr2; //Skip to the last dot.
if(strcmp(ptr,".gat") == 0 ||
strcmp(ptr,".afm") == 0 ||
strcmp(ptr,".af2") == 0)
*ptr = '\0'; //Remove extension.
}
return mapname;
}
// Processes command-line arguments
void process_args(int argc, char *argv[])
{
int i;
for(i = 0; i < argc; i++) {
if(strcmp(argv[i], "-grf") == 0) {
if(++i < argc)
strcpy(grf_list_file, argv[i]);
} else if(strcmp(argv[i], "-list") == 0) {
if(++i < argc)
strcpy(map_list_file, argv[i]);
} else if(strcmp(argv[i], "-cache") == 0) {
if(++i < argc)
strcpy(map_cache_file, argv[i]);
} else if(strcmp(argv[i], "-rebuild") == 0)
rebuild = 1;
}
}
int main(int argc, char *argv[])
{
FILE *list;
char line[1024];
struct map_data map;
char name[MAP_NAME_LENGTH_EXT];
// Process the command-line arguments
process_args(argc, argv);
printf("Initializing grfio with %s\n", grf_list_file);
grfio_init(grf_list_file);
// Attempt to open the map cache file and force rebuild if not found
printf("Opening map cache: %s\n", map_cache_file);
if(!rebuild) {
map_cache_fp = fopen(map_cache_file, "rb");
if(map_cache_fp == NULL) {
printf("Existing map cache not found, forcing rebuild mode\n");
rebuild = 1;
} else
fclose(map_cache_fp);
}
if(rebuild)
map_cache_fp = fopen(map_cache_file, "w+b");
else
map_cache_fp = fopen(map_cache_file, "r+b");
if(map_cache_fp == NULL) {
printf("Failure when opening map cache file %s\n", map_cache_file);
exit(1);
}
// Open the map list
printf("Opening map list: %s\n", map_list_file);
list = fopen(map_list_file, "r");
if(list == NULL) {
printf("Failure when opening maps list file %s\n", map_list_file);
exit(2);
}
// Initialize the main header
if(rebuild) {
header.file_size = sizeof(struct main_header);
header.map_count = 0;
} else {
fread(&header, sizeof(struct main_header), 1, map_cache_fp);
header.file_size = GetULong((unsigned char *)&(header.file_size));
header.map_count = GetUShort((unsigned char *)&(header.map_count));
}
// Read and process the map list
while(fgets(line, 1020, list)){
if(line[0] == '/' && line[1] == '/')
continue;
if(sscanf(line, "%15s", name) < 1)
continue;
if(strcmp("map:", name) == 0 && sscanf(line, "%*s %15s", name) < 1)
continue;
name[MAP_NAME_LENGTH_EXT-1] = '\0';
remove_extension(name);
printf("%s", name);
if(find_map(name))
printf(" already in cache!\n");
else if(read_map(name, &map)) {
cache_map(name, &map);
printf(" successfully cached\n");
} else
printf(" not found in GRF!\n");
}
printf("Closing map list: %s\n", map_list_file);
fclose(list);
// Write the main header and close the map cache
printf("Closing map cache: %s\n", map_cache_file);
fseek(map_cache_fp, 0, SEEK_SET);
fwrite(&header, sizeof(struct main_header), 1, map_cache_fp);
fclose(map_cache_fp);
printf("Finalizing grfio\n");
grfio_final();
printf("%d maps now in cache\n", header.map_count);
return 0;
}