16_vrs now operates on files in far memory

[16.git] / src / lib / 16_vrs.c

diff --git a/src/lib/16_vrs.c b/src/lib/16_vrs.c
old mode 100644 (file)
new mode 100755 (executable)
index d5457ae..054702f
--- a/src/lib/16_vrs.c
+++ b/src/lib/16_vrs.c
@@ -1,47 +1,80 @@
-#include <stdio.h>
-#include <fcntl.h>
-#include <ctype.h>
-#include <errno.h>
-#include <assert.h>
-#include <stdint.h>
-#include <stdlib.h>
-#include <string.h>
-#include <unistd.h>
+/* Project 16 Source Code~
+ * Copyright (C) 2012-2016 sparky4 & pngwen & andrius4669 & joncampbell123 & yakui-lover
+ *
+ * This file is part of Project 16.
+ *
+ * Project 16 is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * Project 16 is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>, or
+ * write to the Free Software Foundation, Inc., 51 Franklin Street,
+ * Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ */
+#include "src/lib/16_vrs.h"
+#include "src/lib/typedefst.h"
 
-#include "stdlib.h"
-#include "16_vrs.h"
+extern global_game_variables_t gvar;
 
+// Read .vrs file into far memory
 int read_vrs(char *filename, struct vrs_container *vrs_cont){
        int fd;
-       unsigned long size;
-       unsigned char *buffer;
+       dword size;
+       byte huge *buffer;
+       // Open filename, get size of file,
+       // populate the vrs_container if all tests pass
        fd = open(filename, O_RDONLY|O_BINARY);
+       size = filelength(fd);
+       close(fd);
        // Insert sanity cheks later
-       size = lseek(fd, 0, SEEK_END);
-       buffer = malloc(size);
-       lseek(fd, 0, SEEK_SET);
-       read(fd, buffer, size);
+       CA_LoadFile(filename, buffer, gvar->mm, gvar->mmi);
        vrs_cont->size = size;
        vrs_cont->buffer = buffer;
-
        return 0;
 }
 
-struct vrl_container* get_vrl_by_id(struct vrs_container *vrs_cont, uint16_t id){
-       uint16_t *ids; 
-       uint32_t *vrl_list;
+// Seek and return a specified .vrl blob from .vrs blob in far memory
+struct vrl_container get_vrl_by_id(struct vrs_container huge *vrs_cont, uint16_t id){
+       uint16_t huge *ids;
+       uint32_t huge *vrl_list;
+       struct vrl_container huge *vrl_cont;
        int counter = 0;
-       struct vrl_container *vrl_cont;
+       // If id is invalid, return null
        if(id == 0){
+               // Probably add an error message?
                return 0;
        }
-       ids = (uint16_t*)vrs_cont->buffer + (unsigned long)vrs_cont->vrs_hdr->offset_table[VRS_HEADER_OFFSET_SPRITE_ID_LIST];
+       // Get id list from .vrs blob (base + offset)
+       ids = (uint16_t huge*)vrs_cont->buffer + 
+               (dword)vrs_cont->vrs_hdr->offset_table[VRS_HEADER_OFFSET_SPRITE_ID_LIST];
+       // Loop through the id list until we found the right one or hit the end of the list
+       // Counter is keeping track of the offset(in ids/vrl blobs)
        while(ids[counter] != id && ids[counter]){
                counter++;
        }
-       vrl_list = (uint32_t *)(vrs_cont->buffer + vrs_cont->vrs_hdr->offset_table[VRS_HEADER_OFFSET_VRS_LIST]);
-       vrl_cont = (struct vrl_container*)malloc(sizeof(struct vrl_container));
-       vrl_cont->vrl_header = (struct vrl1_vgax_header*)(vrs_cont->buffer + vrl_list[counter]);
+       // Return null if we couldn't find the requested id
+       if(!ids[counter]){
+               // Error message?
+               return 0;
+       }
+       // Get vrl list from .vrs blob (base + offset)
+       vrl_list = (uint32_t huge *)(vrs_cont->buffer + 
+                                       vrs_cont->vrs_hdr->offset_table[VRS_HEADER_OFFSET_VRS_LIST]);
+       // Allocate memory for vrl_cont
+       vrl_cont = (struct vrl_container)malloc(sizeof(struct vrl_container));
+       // Get vrl_header from .vrs (base + offset from vrl_list)
+       // Counter is number of vrls to skip (ids and vrls are aligned according to the .vrs specification)
+       vrl_cont->vrl_header = (struct vrl1_vgax_header huge *)(vrs_cont->buffer + vrl_list[counter]);
+       // Get .vrl size by integer arithmetics (next vrl - current vrl)
+       // Untested. May be an incorrect way to do so
        vrl_cont->size = vrl_list[counter+1] - vrl_list[counter];
        return vrl_cont;
 }