Allow switching fonts at runtime

arm9/source/common/ui.c

@@ -27,11 +27,12 @@ static u8 font_bin[FONT_MAX_HEIGHT * FONT_N_SYMBOLS];
 
 u8* GetFontFromPbm(const void* pbm, const u32 pbm_size, u32* w, u32* h) {
     char* hdr = (char*) pbm;
+    u32 hdr_max_size = min(512, pbm_size);
     u32 pbm_w = 0;
     u32 pbm_h = 0;
     
     // minimum size
-    if (pbm_size < 7) return NULL;
+    if (hdr_max_size < 7) return NULL;
     
     // check header magic, then skip over
     if (strncmp(hdr, "P4\n", 3) != 0) return NULL;
@@ -40,30 +41,30 @@ u8* GetFontFromPbm(const void* pbm, const u32 pbm_size, u32* w, u32* h) {
     u32 p = 3;
     while (hdr[p] == '#') {
         while (hdr[p++] != '\n') {
-            if (p >= pbm_size) return NULL;
+            if (p >= hdr_max_size) return NULL;
         }
     }
     
     // parse width
     while ((hdr[p] >= '0') && (hdr[p] <= '9')) {
-        if (p >= pbm_size) return NULL;
+        if (p >= hdr_max_size) return NULL;
         pbm_w *= 10;
         pbm_w += hdr[p++] - '0';
     }
     
     // whitespace
-    if ((hdr[p++] != ' ') || (p >= pbm_size))
+    if ((hdr[p++] != ' ') || (p >= hdr_max_size))
         return NULL;
     
     // parse height
     while ((hdr[p] >= '0') && (hdr[p] <= '9')) {
-        if (p >= pbm_size) return NULL;
+        if (p >= hdr_max_size) return NULL;
         pbm_h *= 10;
         pbm_h += hdr[p++] - '0';
     }
     
     // line break
-    if ((hdr[p++] != '\n') || (p >= pbm_size))
+    if ((hdr[p++] != '\n') || (p >= hdr_max_size))
         return NULL;
     
     // check sizes

arm9/source/filesys/filetype.c

@@ -6,6 +6,7 @@
 #include "keydb.h"
 #include "ctrtransfer.h"
 #include "scripting.h"
+#include "ui.h" // only for font file detection
 
 u64 IdentifyFileType(const char* path) {
     const u8 romfs_magic[] = { ROMFS_MAGIC };
@@ -94,7 +95,9 @@ u64 IdentifyFileType(const char* path) {
         }
     }
     
-    if ((fsize > sizeof(AgbHeader)) &&
+    if (GetFontFromPbm(data, fsize, NULL, NULL)) {
+        return FONT_PBM;
+    } else if ((fsize > sizeof(AgbHeader)) &&
         (ValidateAgbHeader((AgbHeader*) data) == 0)) {
         return GAME_GBA;
     } else if ((fsize > sizeof(BossHeader)) &&

arm9/source/filesys/filetype.h

@@ -27,8 +27,9 @@
 #define BIN_LEGKEY  (1ULL<<22)
 #define TXT_SCRIPT  (1ULL<<23)
 #define TXT_GENERIC (1ULL<<24)
-#define NOIMG_NAND  (1ULL<<25)
+#define FONT_PBM    (1ULL<<25)
-#define HDR_NAND    (1ULL<<26)
+#define NOIMG_NAND  (1ULL<<26)
+#define HDR_NAND    (1ULL<<27)
 #define TYPE_BASE   0xFFFFFFFFULL // 32 bit reserved for base types
 
 // #define FLAG_FIRM   (1ULL<<58) // <--- for CXIs containing FIRMs
@@ -58,6 +59,7 @@
 #define FTYPE_KEYINIT(tp)       (tp&(BIN_KEYDB))
 #define FTYPE_KEYINSTALL(tp)    (tp&(BIN_KEYDB))
 #define FTYPE_SCRIPT(tp)        (tp&(TXT_SCRIPT))
+#define FTYPE_FONT(tp)          (tp&(FONT_PBM))
 #define FTYPE_BOOTABLE(tp)      (tp&(SYS_FIRM))
 #define FTYPE_INSTALLABLE(tp)   (tp&(SYS_FIRM))
 #define FTPYE_AGBSAVE(tp)       (tp&(SYS_AGBSAVE))

arm9/source/godmode.c

@@ -952,6 +952,7 @@ u32 FileHandlerMenu(char* current_path, u32* cursor, u32* scroll, PaneData** pan
     bool keyinitable = (FTYPE_KEYINIT(filetype)) && !((drvtype & DRV_VIRTUAL) && (drvtype & DRV_SYSNAND));
     bool keyinstallable = (FTYPE_KEYINSTALL(filetype)) && !((drvtype & DRV_VIRTUAL) && (drvtype & DRV_SYSNAND));
     bool scriptable = (FTYPE_SCRIPT(filetype));
+    bool fontable = (FTYPE_FONT(filetype));
     bool bootable = (FTYPE_BOOTABLE(filetype));
     bool installable = (FTYPE_INSTALLABLE(filetype));
     bool agbexportable = (FTPYE_AGBSAVE(filetype) && (drvtype & DRV_VIRTUAL) && (drvtype & DRV_SYSNAND));
@@ -966,7 +967,7 @@ u32 FileHandlerMenu(char* current_path, u32* cursor, u32* scroll, PaneData** pan
         extrcodeable = (FTYPE_HASCODE(filetype_cxi));
     }
     
-    bool special_opt = mountable || verificable || decryptable || encryptable || cia_buildable || cia_buildable_legit || cxi_dumpable || tik_buildable || key_buildable || titleinfo || renamable || transferable || hsinjectable || restorable || xorpadable || ebackupable || ncsdfixable || extrcodeable || keyinitable || keyinstallable || bootable || scriptable || installable || agbexportable || agbimportable;
+    bool special_opt = mountable || verificable || decryptable || encryptable || cia_buildable || cia_buildable_legit || cxi_dumpable || tik_buildable || key_buildable || titleinfo || renamable || transferable || hsinjectable || restorable || xorpadable || ebackupable || ncsdfixable || extrcodeable || keyinitable || keyinstallable || bootable || scriptable || fontable || installable || agbexportable || agbimportable;
     
     char pathstr[32+1];
     TruncateString(pathstr, file_path, 32, 8);
@@ -1016,6 +1017,7 @@ u32 FileHandlerMenu(char* current_path, u32* cursor, u32* scroll, PaneData** pan
         (filetype & BIN_LEGKEY) ? "Build " KEYDB_NAME     :
         (filetype & BIN_NCCHNFO)? "NCCHinfo options..."   :
         (filetype & TXT_SCRIPT) ? "Execute GM9 script"    :
+        (filetype & FONT_PBM)   ? "Set as active font"   :
         (filetype & HDR_NAND)   ? "Rebuild NCSD header"   :
         (filetype & NOIMG_NAND) ? "Rebuild NCSD header" : "???";
     optionstr[hexviewer-1] = "Show in Hexeditor";
@@ -1158,6 +1160,7 @@ u32 FileHandlerMenu(char* current_path, u32* cursor, u32* scroll, PaneData** pan
     int install = (installable) ? ++n_opt : -1;
     int boot = (bootable) ? ++n_opt : -1;
     int script = (scriptable) ? ++n_opt : -1;
+    int font = (fontable) ? ++n_opt : -1;
     int agbexport = (agbexportable) ? ++n_opt : -1;
     int agbimport = (agbimportable) ? ++n_opt : -1;
     if (mount > 0) optionstr[mount-1] = (filetype & GAME_TMD) ? "Mount CXI/NDS to drive" : "Mount image to drive";
@@ -1185,6 +1188,7 @@ u32 FileHandlerMenu(char* current_path, u32* cursor, u32* scroll, PaneData** pan
     if (install > 0) optionstr[install-1] = "Install FIRM";
     if (boot > 0) optionstr[boot-1] = "Boot FIRM";
     if (script > 0) optionstr[script-1] = "Execute GM9 script";
+    if (font > 0) optionstr[font-1] = "Set as active font";
     if (agbexport > 0) optionstr[agbexport-1] = "Dump GBA VC save";
     if (agbimport > 0) optionstr[agbimport-1] = "Inject GBA VC save";
     
@@ -1592,6 +1596,12 @@ u32 FileHandlerMenu(char* current_path, u32* cursor, u32* scroll, PaneData** pan
         ClearScreenF(true, true, COLOR_STD_BG);
         return 0;
     }
+    else if (user_select == font) { // set font
+        u32 pbm_size = FileGetData(file_path, TEMP_BUFFER, TEMP_BUFFER_SIZE, 0);
+        if (pbm_size) SetFontFromPbm(TEMP_BUFFER, pbm_size);
+        ClearScreenF(true, true, COLOR_STD_BG);
+        return 0;
+    }
     else if (user_select == agbexport) { // export GBA VC save
         if (DumpGbaVcSavegame(file_path) == 0)
             ShowPrompt(false, "Savegame dumped to " OUTPUT_PATH);