add AR code file parser and shit

src/ARCodeFile.cpp

@@ -0,0 +1,176 @@
+/*
+    Copyright 2016-2020 Arisotura
+
+    This file is part of melonDS.
+
+    melonDS 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.
+
+    melonDS 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 melonDS. If not, see http://www.gnu.org/licenses/.
+*/
+
+#include <stdio.h>
+#include <string.h>
+#include "ARCodeFile.h"
+#include "Platform.h"
+
+
+// TODO: import codes from other sources (usrcheat.dat, ...)
+// TODO: more user-friendly error reporting
+
+
+ARCodeFile::ARCodeFile(const char* filename)
+{
+    memset(Filename, 0, sizeof(Filename));
+    strncpy(Filename, filename, 1023);
+
+    Error = false;
+
+    Categories.clear();
+
+    FILE* f = Platform::OpenFile(Filename, "r");
+    if (!f) return;
+
+    bool isincat = false;
+    ARCodeCat curcat;
+
+    bool isincode = false;
+    ARCode curcode;
+
+    char linebuf[1024];
+    while (!feof(f))
+    {
+        fgets(linebuf, 1024, f);
+        linebuf[1023] = '\0';
+
+        char* start = linebuf;
+        while (start[0]==' ' || start[0]=='\t')
+            start++;
+
+        if (start[0]=='#' || start[0]=='\r' || start[0]=='\n' || start[0]=='\0')
+            continue;
+
+        if (!strncasecmp(start, "CAT", 3))
+        {
+            char catname[128];
+            int ret = sscanf(start, "CAT %127[^\n]", catname);
+            catname[127] = '\0';
+
+            if (ret < 1)
+            {
+                printf("AR: malformed CAT line: %s\n", start);
+                fclose(f);
+                Error = true;
+                return;
+            }
+
+            if (isincode) curcat.Codes.push_back(curcode);
+            isincode = false;
+
+            if (isincat) Categories.push_back(curcat);
+            isincat = true;
+
+            memcpy(curcat.Name, catname, 128);
+            curcat.Codes.clear();
+        }
+        else if (!strncasecmp(start, "CODE", 4))
+        {
+            int enable;
+            char codename[128];
+            int ret = sscanf(start, "CODE %d %127[^\n]", &enable, codename);
+            codename[127] = '\0';
+
+            if (ret < 2)
+            {
+                printf("AR: malformed CODE line: %s\n", start);
+                fclose(f);
+                Error = true;
+                return;
+            }
+
+            if (!isincat)
+            {
+                printf("AR: encountered CODE line with no category started\n");
+                fclose(f);
+                Error = true;
+                return;
+            }
+
+            if (isincode) curcat.Codes.push_back(curcode);
+            isincode = true;
+
+            memcpy(curcode.Name, codename, 128);
+            curcode.Enabled = enable!=0;
+            curcode.CodeLen = 0;
+        }
+        else
+        {
+            u32 c0, c1;
+            int ret = sscanf(start, "%08X %08X", &c0, &c1);
+
+            if (ret < 2)
+            {
+                printf("AR: malformed data line: %s\n", start);
+                fclose(f);
+                Error = true;
+                return;
+            }
+
+            if (!isincode)
+            {
+                printf("AR: encountered data line with no code started\n");
+                fclose(f);
+                Error = true;
+                return;
+            }
+
+            if (curcode.CodeLen >= 2*64)
+            {
+                printf("AR: code too long!\n");
+                fclose(f);
+                Error = true;
+                return;
+            }
+
+            u32 idx = curcode.CodeLen;
+            curcode.Code[idx+0] = c0;
+            curcode.Code[idx+1] = c1;
+            curcode.CodeLen += 2;
+        }
+    }
+
+    if (isincode) curcat.Codes.push_back(curcode);
+    if (isincat) Categories.push_back(curcat);
+
+    fclose(f);
+
+    printf("PARSED OUTPUT\n");
+    for (ARCodeCatList::iterator it = Categories.begin(); it != Categories.end(); it++)
+    {
+        ARCodeCat& cat = *it;
+        printf("CAT %s\n", cat.Name);
+
+        for (ARCodeList::iterator jt = cat.Codes.begin(); jt != cat.Codes.end(); jt++)
+        {
+            ARCode& code = *jt;
+            printf("CODE %d %s\n", code.Enabled, code.Name);
+
+            for (u32 i = 0; i < code.CodeLen; i+=2)
+            {
+                printf("%08X %08X\n", code.Code[i], code.Code[i+1]);
+            }
+        }
+    }
+}
+
+ARCodeFile::~ARCodeFile()
+{
+    //
+}