From 781dba2e4095d0e72af3f0c38d2de7bafc21c57d Mon Sep 17 00:00:00 2001
From: yakui-lover <yakui-lover@yandex.ru>
Date: Tue, 19 Jul 2016 20:20:36 +0100
Subject: [PATCH] Added a bit of .vrs handling functions (untested)

---
 src/lib/16_vrs.c | 47 +++++++++++++++++++++++++++++++++++++++++++++++
 src/lib/16_vrs.h | 21 +++++++++++++++++++++
 2 files changed, 68 insertions(+)
 create mode 100644 src/lib/16_vrs.c
 create mode 100644 src/lib/16_vrs.h

diff --git a/src/lib/16_vrs.c b/src/lib/16_vrs.c
new file mode 100644
index 00000000..d5457ae5
--- /dev/null
+++ b/src/lib/16_vrs.c
@@ -0,0 +1,47 @@
+#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>
+
+#include "stdlib.h"
+#include "16_vrs.h"
+
+int read_vrs(char *filename, struct vrs_container *vrs_cont){
+	int fd;
+	unsigned long size;
+	unsigned char *buffer;
+	fd = open(filename, O_RDONLY|O_BINARY);
+	// Insert sanity cheks later
+	size = lseek(fd, 0, SEEK_END);
+	buffer = malloc(size);
+	lseek(fd, 0, SEEK_SET);
+	read(fd, buffer, size);
+	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;
+	int counter = 0;
+	struct vrl_container *vrl_cont;
+	if(id == 0){
+		return 0;
+	}
+	ids = (uint16_t*)vrs_cont->buffer + (unsigned long)vrs_cont->vrs_hdr->offset_table[VRS_HEADER_OFFSET_SPRITE_ID_LIST];
+	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]);
+	vrl_cont->size = vrl_list[counter+1] - vrl_list[counter];
+	return vrl_cont;
+}
diff --git a/src/lib/16_vrs.h b/src/lib/16_vrs.h
new file mode 100644
index 00000000..38b8132d
--- /dev/null
+++ b/src/lib/16_vrs.h
@@ -0,0 +1,21 @@
+#include "hw/vga/vrl.h"
+#include "hw/vga/vrs.h"
+
+struct vrs_container{
+	unsigned long size;
+	union{
+		unsigned char *buffer;
+		struct vrs_header *vrs_hdr;
+	};
+};
+
+struct vrl_container{
+	unsigned long size;
+	union{
+		unsigned char *buffer;
+		struct vrl1_vgax_header *vrl_header;
+	};
+};
+
+int read_vrs(char *filename, struct vrs_container *vrs_cont);
+struct vrl_container* get_vrl_by_id(struct vrs_container *vrs_cont, uint16_t id);
-- 
2.39.2