// 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] = "conf/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; 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 bottom-left corner height = GetFloat( gat + off ); // Type of cell type = GetULong( gat + off + 16 ); off += 20; if (type == 0 && water_height != NO_WATER && height > water_height) type = 3; // Cell is 0 (walkable) but under water level, set to 3 (walkable water) 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) *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(EXIT_FAILURE); } // 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(EXIT_FAILURE); } // 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, sizeof(line), 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; }