agsalphainfo.c

   1 #define _GNU_SOURCE
   2 #include "DataFile.h"
   3 #include <stdio.h>
   4 #include <stdlib.h>
   5 #include <unistd.h>
   6 #include "version.h"
   7 #define ADS ":::AGSalphainfo " VERSION " by rofl0r:::"
   8
   9 static int usage(char *argv0) {
  10         fprintf(stderr, ADS "\nusage:\n%s [-s spriteno] DIR\n"
  11                    "prints alphachannel flags of all sprites, or specified sprite, in game file.\n"
  12                    "gamefile is typically ac2game.dta or game28.dta inside DIR.\n"
  13                    , argv0);
  14         return 1;
  15 }
  16
  17 #define SPF_ALPHACHANNEL 0x10
  18
  19 int main(int argc, char**argv) {
  20         int c, flags = 0, spriteno = -1;
  21         while ((c = getopt(argc, argv, "s:")) != EOF) switch(c) {
  22                 case 's': spriteno = atoi(optarg); break;
  23                 default: return usage(argv[0]);
  24         }
  25         if(!argv[optind]) return usage(argv[0]);
  26         char *dir = argv[optind];
  27
  28         ADF a_b, *a = &a_b;
  29         char fnbuf[512];
  30         if(!ADF_find_datafile(dir, fnbuf, sizeof(fnbuf)))
  31                 return 1;
  32
  33         enum ADF_open_error aoe = ADF_open(a, fnbuf);
  34         if(aoe != AOE_success && aoe <= AOE_gamebase) {
  35                 fprintf(stderr, "failed to open/process data file: %s\n", AOE2str(aoe));
  36                 return 1;
  37         } else if (aoe != AOE_success) {
  38                 fprintf(stderr, "warning: failed to process some non-essential parts (%s) of gamefile, probably from a newer game format\n", AOE2str(aoe));
  39         }
  40
  41         off_t off = ADF_get_spriteflagsstart(a);
  42         unsigned nsprites = ADF_get_spritecount(a);
  43         ADF_close(a);
  44
  45         FILE *f = fopen(fnbuf, "rb");
  46         if(!f) return 1;
  47         fseeko(f, off, SEEK_SET);
  48         unsigned char *buf = malloc(nsprites);
  49         fread(buf, 1, nsprites, f);
  50         fclose(f);
  51
  52         size_t i;
  53         static const char *offon[] = { "OFF", "ON" };
  54         for(i=0;i<nsprites;++i) {
  55                 if(spriteno == -1 || spriteno == i)
  56                         printf("sprite %zu: alpha %s\n", i, offon[!!(buf[i] & SPF_ALPHACHANNEL)]);
  57         }
  58         free(buf);
  59         return 0;
  60 }