1 files changed, 145 insertions, 0 deletions
diff --git a/src/file_system.c b/src/file_system.c
new file mode 100644
index 0000000..adddb5e
--- /dev/null
+++ b/src/file_system.c
@@ -0,0 +1,145 @@
+#include "global.h"
+
+struct File
+{
+    char *name;
+    u8 *data;
+};
+
+struct OpenedFile
+{
+    struct File *file;
+    u8 *data;
+};
+
+struct FileArchive
+{
+    char magic[8];
+    s32 count;
+    struct File *entries;
+};
+
+extern struct OpenedFile gUnknown_202D2A8[];
+
+extern u32 gUnknown_203B094;
+extern u32 gUnknown_202D2A4;
+
+extern int sprintf(char *, const char *, ...);
+
+u8 *GetSiroPtr(struct OpenedFile *);
+
+void InitFileSystem(void)
+{
+    s32 i;
+
+    for (i = 0; i < 64; i++)
+    {
+        gUnknown_202D2A8[i].file = NULL;
+        gUnknown_202D2A8[i].data = NULL;
+    }
+
+    gUnknown_203B094 = 0;
+    gUnknown_202D2A4 = 1;
+}
+
+u32 sub_800A8F8(u32 value)
+{
+    u32 oldValue = gUnknown_202D2A4;
+    gUnknown_202D2A4 = value;
+    return oldValue;
+}
+
+struct OpenedFile *OpenFile(char *filename, struct FileArchive *arc)
+{
+    char buffer[0x12C];
+    s32 left, right;
+    s32 cursor;
+    s32 i;
+    s32 magic = 0;
+    s32 magicFound;
+    struct File *entries;
+    struct File *file;
+
+    magic = strcmp(arc->magic, "pksdir0") != 0;
+
+    magicFound = 0;
+
+    if (!(u8)magic)
+        magicFound = 1;
+
+    if (!magicFound)
+        return NULL;
+
+    entries = arc->entries;
+    left = 0;
+    right = arc->count - 1;
+
+    while (left < right)
+    {
+        s32 mid = (left + right) / 2;
+        int result = strcmp(entries[mid].name, filename);
+        if (result == 0)
+        {
+            left = mid;
+            break;
+        }
+        else if (result < 0)
+        {
+            left = mid + 1;
+        }
+        else
+        {
+            right = mid;
+        }
+    }
+
+    file = &entries[left];
+
+    if (strcmp(file->name, filename))
+    {
+        sprintf(buffer, "not find file [%s]\n", filename);
+        return NULL;
+    }
+
+    cursor = gUnknown_203B094;
+
+    for (i = 0; i < 64; i++)
+    {
+        cursor++;
+        if (cursor > 63)
+            cursor = 0;
+        if (!gUnknown_202D2A8[cursor].file)
+        {
+            gUnknown_202D2A8[cursor].file = file;
+            gUnknown_202D2A8[cursor].data = NULL;
+            return &gUnknown_202D2A8[cursor];
+        }
+    }
+
+    return NULL;
+}
+
+static u8 *_GetFileDataPtr(struct OpenedFile *openedFile)
+{
+    openedFile->data = openedFile->file->data;
+    return openedFile->data;
+}
+
+u8 *GetFileDataPtr(struct OpenedFile *openedFile, int unused)
+{
+    _GetFileDataPtr(openedFile);
+    return GetSiroPtr(openedFile);
+}
+
+struct OpenedFile *OpenFileAndGetFileDataPtr(char *filename, struct FileArchive *arc)
+{
+    struct OpenedFile *openedFile = OpenFile(filename, arc);
+    if (openedFile)
+        GetFileDataPtr(openedFile, 0);
+    return openedFile;
+}
+
+struct OpenedFile *Call_OpenFileAndGetFileDataPtr(char *filename, struct FileArchive *arc)
+{
+    return OpenFileAndGetFileDataPtr(filename, arc);
+}