loader.c

   1 /*
   2    Cantaveria - action adventure platform game
   3    Copyright (C) 2009 2010 Evan Rinehart
   4
   5    This program is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU General Public License
   7    as published by the Free Software Foundation; either version 2
   8    of the License, or (at your option) any later version.
   9
  10    This program is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13    GNU General Public License for more details.
  14
  15    You should have received a copy of the GNU General Public License
  16    along with this program; if not, write to
  17
  18    The Free Software Foundation, Inc.
  19    51 Franklin Street, Fifth Floor
  20    Boston, MA  02110-1301, USA
  21 */
  22
  23 #include <string.h>
  24 #include <stdlib.h>
  25 #include <stdarg.h>
  26 #include <stdio.h>
  27
  28
  29 #include <list.h>
  30 #include <loader.h>
  31 #include <util.h>
  32 #include <zip.h>
  33
  34 struct reader {
  35         zip_file* f;
  36         int next_c;
  37 };
  38
  39 zip_archive* arc;
  40
  41
  42 void loader_init(){
  43         char* filename = "data.zip";
  44         arc = zip_aropenf(filename);
  45         if(arc == NULL){
  46                 fatal_error("loader: unable to load data archive \"%s\" (%s)\n", filename, zip_geterror());
  47         }
  48         boot_msg("loader: game data found\n");
  49 }
  50
  51 void loader_quit(){
  52         zip_arclose(arc);
  53 }
  54
  55 reader* data_open(char* dir, char* filename){
  56         char buf[1024];
  57         strcpy(buf, dir);
  58         strcat(buf, filename);
  59         return loader_open(buf);
  60 }
  61
  62 reader* loader_open(char* filename){
  63         char buf[1024] = "data/";
  64         int L = strlen(buf);
  65         strncpy(buf+L,filename,1024-L);
  66         buf[1023] = 0;
  67
  68         reader* rd = xmalloc(sizeof(reader));
  69         rd->f = zip_fopen(arc, filename);
  70         if(!rd->f){
  71                 error_msg("loader_open: can't open %s (%s)\n", filename, zip_geterror());
  72                 free(rd);
  73                 return NULL;
  74         }
  75         return rd;
  76 }
  77
  78
  79 void loader_close(reader* rd){
  80         zip_fclose(rd->f);
  81         free(rd);
  82 }
  83
  84
  85 int loader_read(reader* rd, void* buf, int count){
  86         int n = zip_fread(rd->f, buf, count);
  87         if(n < 0){
  88                 error_msg("loader_read: %s\n", zip_geterror());
  89                 return -1;
  90         }
  91         return n;
  92 }
  93
  94 unsigned char* loader_readall(char* filename, int* size){
  95         reader* rd = loader_open(filename);
  96         if(!rd) return NULL;
  97
  98         /* somehow read all of rd into a buffer and return it */
  99
 100 /* FIXME */
 101         error_msg("loader_readall: not yet implemented\n");
 102         return NULL;
 103 }
 104
 105 int loader_readline(reader* rd, char* buf, int size){
 106         char c;
 107         int i = 0;
 108         int n;
 109
 110         while(i < size){
 111                 n = loader_read(rd, &c, 1);
 112                 if(n == 0){ /* end of file */
 113                         buf[i] = '\0';
 114                         return 0;
 115                 }
 116
 117                 if(n < 0){
 118                         error_msg("loader_readline: %s\n", zip_geterror());
 119                         return -1;
 120                 }
 121
 122                 if(c == '\r'){ /* CRLF ? */
 123                         n = loader_read(rd, &c, 1);
 124                         if(n == 0){ /* file ended with CR... well take it */
 125                                 buf[i] = '\0';
 126                                 return 0;
 127                         }
 128
 129                         if(n < 0){
 130                                 error_msg("loader_readline: %s\n", zip_geterror());
 131                                 return -1;
 132                         }
 133
 134                         if(c != '\n'){
 135                                 error_msg("loader_readline: I cannot read lines ending in CR and not CRLF\n");
 136                                 return -1;
 137                         }
 138
 139                         buf[i] = '\0';
 140                         return 0;
 141                 }
 142
 143                 if(c == '\n'){ /* LF */
 144                         buf[i] = '\0';
 145                         return 0;
 146                 }
 147
 148                 buf[i] = c;
 149                 i += 1;
 150         }
 151
 152         error_msg("loader_readline: buffer size too small\n");
 153         return 0;
 154 }
 155
 156 int loader_scanline(reader* rd, char* format, ...){
 157         char buf[256] = "";
 158         va_list ap;
 159         int ret;
 160
 161         if(loader_readline(rd, buf, 256) < 0){
 162                 return -1;
 163         }
 164
 165         va_start(ap, format);
 166         ret = vsscanf(buf,format,ap);
 167         va_end(ap);
 168
 169         return ret;
 170 }
 171
 172
 173
 174
 175 /*binary i/o*/
 176 int read_bytes(reader* rd, unsigned char* buf, int count){
 177         int n = loader_read(rd, buf, count);
 178         if(n < 0){
 179                 error_msg("read_bytes: read error\n");
 180                 return -1;
 181         }
 182         else if(n != count){
 183                 error_msg("read_bytes: end of file reached prematurely (%d out of %d read)\n", n, count);
 184                 return -1;
 185         }
 186         else{
 187                 return 0;
 188         }
 189 }
 190
 191 int read_byte(reader* rd, int* out){
 192         unsigned char c;
 193         int n = loader_read(rd, &c, 1);
 194         if(n < 0){
 195                 error_msg("read_byte: read error\n");
 196                 return -1;
 197         }
 198         else{
 199                 *out = c;
 200                 return 0;
 201         }
 202 }
 203
 204 int read_short(reader* rd, int* out){
 205         unsigned char c[2];
 206         int n = loader_read(rd, c, 2);
 207
 208         if(n < 0){
 209                 error_msg("read_byte: read error\n");
 210                 return -1;
 211         }
 212         else if(n != 2){
 213                 error_msg("read_short: end of file reached prematurely\n");
 214                 return -1;
 215         }
 216         else{
 217                 *out = (c[0]<<8) | c[1];
 218                 return 0;
 219         }
 220 }
 221
 222 int read_int(reader* rd, int* out){
 223         unsigned char c[4];
 224         int n = loader_read(rd, c, 4);
 225
 226         if(n < 0){
 227                 error_msg("read_byte: read error\n");
 228                 return -1;
 229         }
 230         else if(n != 4){
 231                 error_msg("read_int: end of file reached prematurely\n");
 232                 return -1;
 233         }
 234         else{
 235                 *out = (c[0]<<24) | (c[1]<<16) | (c[2]<<8) | c[3];
 236                 return 0;
 237         }
 238 }
 239
 240 int read_string(reader* rd, char** out){
 241         unsigned L;
 242         if(read_int(rd, (int*)&L) < 0){
 243                 return -1;
 244         }
 245
 246         *out = xmalloc(L+1);
 247         *out[L] = '\0';
 248         if(read_bytes(rd, (unsigned char*)*out, L) < 0){
 249                 free(*out);
 250                 return -1;
 251         }
 252         else{
 253                 return 0;
 254         }
 255 }
 256
 257
 258
 259 list* loader_readdir(char* path){
 260         zip_dir* dir = zip_opendir(arc, path);
 261         if(dir == NULL){
 262                 error_msg("loader_readdir: unable to open '%s' (%s)\n",
 263                         path, zip_geterror());
 264                 return NULL;
 265         }
 266
 267         list* dirs = empty();
 268         while(1){
 269                 char* entry = zip_readdir(dir);
 270                 if(entry == NULL) break;
 271                 else push(dirs, entry);
 272         }
 273
 274         return dirs;
 275 }
 276
 277 void loader_freedirlist(list* dirs){
 278         recycle(dirs);
 279 }
 280