From 08132a1fd7d668aa62a71cc304d595fb3134b456 Mon Sep 17 00:00:00 2001
From: Godzil <godzil@godzil.net>
Date: Thu, 12 Sep 2019 17:54:27 +0100
Subject: [PATCH] Add a tool to dump cart metadata

---
 oswan/Makefile   |   5 ++-
 oswan/dumpinfo.c | 106 +++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 110 insertions(+), 1 deletion(-)
 create mode 100644 oswan/dumpinfo.c

diff --git a/oswan/Makefile b/oswan/Makefile
index 365cd60..399b824 100644
--- a/oswan/Makefile
+++ b/oswan/Makefile
@@ -14,7 +14,7 @@ OBJS       = $(wonderswan_CXX_SRCS:.cpp=.o)
 
 
 
-all: wonderswan
+all: wonderswan dumpinfo
 
 CXX       = g++
 CXXFLAGS  = -g -O2 `sdl-config --cflags` -Wall -Werror -std=c++98 -Wno-write-strings
@@ -52,5 +52,8 @@ $(EXTRASUBDIRS:%=%/__clean__): dummy
 clean:: $(SUBDIRS:%=%/__clean__) $(EXTRASUBDIRS:%=%/__clean__)
 	$(RM) $(CLEAN_FILES) $(RC_SRCS:.rc=.res) $(OBJS) $(EXES:%.exe=%) $(EXES:%=%.so) $(EXES:%=%.spec.o) $(DLLS:%=%.so) $(DLLS:%=%.spec.o)
 
+dumpinfo: dumpinfo.o
+	$(CXX) $(LIBS) -o $@ $(<)
+
 wonderswan: $(OBJS)
 	$(CXX) $(LIBS) -o $@ $(OBJS) -laudio
diff --git a/oswan/dumpinfo.c b/oswan/dumpinfo.c
new file mode 100644
index 0000000..ae5de09
--- /dev/null
+++ b/oswan/dumpinfo.c
@@ -0,0 +1,106 @@
+#include <stdio.h>
+#include <stdint.h>
+#include <stdlib.h>
+#include <sys/mman.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+char *load_file(char *filename, uint32_t *fileSize)
+{
+    int fd;
+    char *ret_ptr;
+    struct stat FileStat;
+
+    fd = open(filename, O_RDWR);
+
+    fstat(fd, &FileStat);
+
+    ret_ptr = (char *)mmap(NULL, FileStat.st_size, PROT_READ|PROT_WRITE, MAP_SHARED, fd, 0);
+
+    *fileSize = FileStat.st_size;
+
+    close(fd);
+
+    if (ret_ptr == MAP_FAILED)
+    {
+        ret_ptr = NULL;
+    }
+
+    return ret_ptr;
+}
+
+#pragma pack(1)
+struct cart_metadata 
+{
+    uint8_t farjump[5];
+    uint8_t flagExt;
+    uint8_t publishId;
+    uint8_t gameId[2];
+    uint8_t flags2;
+    uint8_t romInfo;
+    uint8_t saveInfo;
+    uint16_t flags;
+    uint16_t crc;
+};
+#pragma pack()
+
+
+int main(int argc, char *argv[])
+{
+    char *content;
+    uint32_t size;
+    struct cart_metadata *data;
+    int ret = -1;
+
+    if (argc != 2)
+    {
+        printf("Usage: %s file.ws[c]\n", argv[0]);
+    }
+    else
+    {
+        content = load_file(argv[1], &size);
+
+        if (content != NULL)
+        {
+            data = (struct cart_metadata*)&(content[size - sizeof(struct cart_metadata)]);
+
+            printf("%s:\n", argv[1]);
+            if (data->farjump[0] == 0xEA)
+            {
+                printf("[%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x:%02x]",
+                        data->publishId, data->gameId[0], data->gameId[1], data->flags2, data->romInfo, data->saveInfo,
+                        data->flags & 0xFF, (data->flags>>8) & 0xFF, data->crc & 0xFF, (data->crc>>8) & 0xFF);
+                printf(" - Reset @ %02X%02X:%02X%02Xh\n",
+                        data->farjump[4], data->farjump[3],
+                        data->farjump[2], data->farjump[1]);
+
+                printf(" - publisher: %02X, gameId: %01X%02X\n", data->publishId, data->gameId[0], data->gameId[1]);
+                printf(" - %s want to write to EEPROM\n", data->flags2&0x80?"Do":"Do not");
+                printf(" - %s user defined bootsplash\n", data->flagExt&0x80?"Dissallow":"Allow");
+                printf(" - Is %sbootable on a normal swan\n", data->flagExt&0x0F?"not ":"");
+                printf(" - ROM Size: %02Xh\n", data->romInfo);
+                printf(" - Save type & Size: %02Xh\n", data->saveInfo);
+                printf(" - Flags: %d cycles ROM, %d bit ROM bus, %sRTC, %s orientation\n", 
+                        data->flags & 0x004?1:3,
+                        data->flags & 0x002?8:16,
+                        data->flags & 0x100?"":"No ",
+                        data->flags & 0x001?"Vertical":"Horizontal");
+                printf(" - CRC: %04Xh\n", data->crc);
+                ret = 0;
+            }
+            else
+            {
+                printf(" - File is not a valid WonderSwan ROM.\n");
+            }
+
+        }
+        else
+        {
+            printf("Cannot open '%s'\n", argv[1]);
+        }
+    }
+
+    return ret;
+}