agsinject.c

   1 #define _GNU_SOURCE
   2 #include "DataFile.h"
   3 #include "RoomFile.h"
   4 #include "ByteArray.h"
   5 #include <stdio.h>
   6 #include <stdlib.h>
   7 #include <unistd.h>
   8 #include "version.h"
   9 #define ADS ":::AGSinject " VERSION " by rofl0r:::"
  10
  11 __attribute__((noreturn))
  12 void usage(char *argv0) {
  13         dprintf(2,
  14         ADS "\nusage:\n%s index input.o inject_to.crm\n"
  15         "index is the number of script to replace, i.e. 0 for first script\n"
  16         "only relevant if the output file is a gamefile which contains multiple scripts\n"
  17         "for example gamescript is 0, dialogscript is 1 (if existing), etc\n"
  18         "a room file (.crm) only has one script so you can pass 0.\n", argv0);
  19         exit(1);
  20 }
  21
  22 /* inj = filename of file to inject in */
  23 static int inject(char *o, char *inj, unsigned which) {
  24         //ARF_find_code_start
  25         AF f_b, *f = &f_b;
  26         size_t index = 0;
  27         size_t found = 0;
  28         int isroom = (which == 0 && !strcmp(".crm", inj + strlen(inj) - 4));
  29         if(AF_open(f, inj)) {
  30                 ssize_t start;
  31                 while(1) {
  32                         if((start = ARF_find_code_start(f, index)) == -1) {
  33                                 dprintf(2, "error, only %zu scripts found\n", found);
  34                                 return 0;
  35                         }
  36                         if(found == which) {
  37                                 char *tmp = tempnam(".", "agsinject.tmp");
  38                                 FILE *out = fopen(tmp, "w");
  39                                 if(!out) return 0;
  40
  41                                 /* 1) dump header */
  42                                 AF_dump_chunk_stream(f, 0, isroom ? start -4 : start, out);
  43                                 AF_set_pos(f, start);
  44
  45                                 /* open replacement object file */
  46                                 struct ByteArray b;
  47                                 ByteArray_ctor(&b);
  48                                 ByteArray_open_file(&b, o);
  49
  50                                 if(isroom) {
  51                                         /* 2a) if room, write length */
  52                                         /* room files, unlike game files, have a length field of size 4 before
  53                                          * the compiled script starts. */
  54                                         unsigned l = ByteArray_get_length(&b);
  55                                         struct ByteArray c;
  56                                         ByteArray_ctor(&c);
  57                                         ByteArray_open_mem(&c, 0, 0);
  58                                         ByteArray_set_flags(&c, BAF_CANGROW);
  59                                         ByteArray_set_endian(&c, BAE_LITTLE);
  60                                         ByteArray_writeInt(&c, l);
  61                                         ByteArray_dump_to_stream(&c, out);
  62                                         ByteArray_close(&c);
  63                                 }
  64                                 /* 2b) dump object file */
  65                                 ByteArray_dump_to_stream(&b, out);
  66                                 ByteArray_close_file(&b);
  67
  68                                 ASI s;
  69                                 if(!ASI_read_script(f, &s)) {
  70                                         dprintf(2, "trouble finding script in %s\n", inj);
  71                                         return 0;
  72                                 }
  73                                 /* 3) dump rest of file */
  74                                 AF_dump_chunk_stream(f, start + s.len, ByteArray_get_length(f->b) - (start + s.len), out);
  75                                 AF_close(f);
  76                                 fclose(out);
  77                                 return !rename(tmp, inj);
  78                         }
  79
  80                         found++;
  81                         index = start + 4;
  82                 }
  83
  84         } else {
  85                 return 0;
  86         }
  87 }
  88
  89 int main(int argc, char**argv) {
  90         if(argc != 4) usage(argv[0]);
  91         char *o = argv[2], *inj = argv[3], *p;
  92         if(!(p = strrchr(o, '.')) || strcmp(p, ".o")) {
  93                 dprintf(2, "error: object file has no .o extension\n");
  94                 return 1;
  95         }
  96         int which = atoi(argv[1]);
  97         dprintf(1, "injecting %s into %s as %d'th script ...", o, inj, which);
  98         int ret = inject(o, inj, which);
  99         if(ret) dprintf(1, "OK\n");
 100         else {
 101                 dprintf(1, "FAIL\n");
 102                 perror("error:");
 103         }
 104         return !ret;
 105 }